• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present invention relates to a modular liquid / gas separation plant for a multiphase fluid such as crude oil comprising a plurality of unitary separation devices consisting of an enclosure (1) cooperating at its base with a coaxial connecting piece (6). ) connected or intended to be connected to a support structure (10) resting at the bottom of the sea (20) able to receive a plurality of said unitary separation devices (1) reversibly so as to ensure disconnections at will in particular to increase the separation capabilities of the installation and / or ensure the maintenance of the unitary surface separation device.
    公开号:FR3016802A1
    申请号:FR1400216
    申请日:2014-01-29
    公开日:2015-07-31
    发明作者:Raymond Hallot
    申请人:Saipem SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a vertical liquid / gas-type modular separation plant and a method for separating multiphase fluid, in particular to a liquid-gas separation system and to a method for separating a multiphase fluid, in particular oil-water and gas contained in crude oil. The technical sector of the invention is more particularly the field of oil production, and more particularly the field of offshore oil fields at great depth.
    [0002] Oil production in the deep sea is generally carried out from a floating support anchored near oil wells located at the seabed, that is to say at varying depths of 1000 to 2500m, see more. The floating support generally comprises anchoring means to remain in position despite the effects of currents, winds and waves. It also generally comprises oil storage and processing means as well as means of unloading to removal tankers, the latter being present at regular intervals to carry out the removal of the production. The common name of these floating supports is the Anglo-Saxon term "Floating Production Storage Offloading" (meaning "floating medium of storage, production and unloading") which one uses the abbreviated term "FPSO" in the whole of the following description. The wellheads are generally connected to said FPSO by submarine lines either of the SCR type, that is to say, pipes suspended in a chain configuration, or of the hybrid tower type comprising: a vertical riser of which the lower end is anchored to the seabed and connected to a said pipe resting at the bottom of the sea, and the upper end is stretched by a submerged submerged float 30 to which it is connected, and a connecting pipe, in general a flexible connecting pipe, between the upper end of said riser and a floating support surface, said flexible connecting pipe taking, if appropriate, by its own weight in the form of a plunging chain curve, that is, ie descending widely below the float and then back up to that floating support. The entire production of crude oil is generally brought back on board the FPSO to be treated to separate the oil itself, water, gas, and any sand components. The oil, once separated, is thus stored on board, the gas is washed, then sent to the gas turbines for the production of electricity and the necessary heat on board, then the surplus is reinjected into the tank of the field tanker so as to pressurize said tank.
    [0003] The water, after having been released from the sand in suspension, is finally either released to the sea after extensive extraction of any oil particle, or is also reinjected into the reservoir, a complement of seawater taken in sub-surface , generally in addition, to achieve the required flow of water injection into the tank. Extracted sand, which is only a small quantity, is finally washed and then discharged at sea. The separation of gases, water and crude oil used in fixed onshore facilities and on FPSOs is known. use pressure-resistant enclosures, very large volumes, generally of elongated cylindrical shape, the crude oil entering at one end and traveling along said enclosure for a period of the order of 3-10 min during which the various phases naturally separate by gravity to reach the second end. The gas is then recovered in the upper part of the said enclosure, the water and sand in the lower part, and the oil (oil) in the intermediate part. There is a very wide variety of such separators which generally incorporate internal complementary devices, such as horizontal, vertical or oblique screens, the purpose of which is to facilitate the separation of the phases and to prevent them from being re-mixed. at a later stage. These separators operate at low pressure, for example 3-10 bar, sometimes even in depression, so as to optimize the degassing of crude oil. If it is desired to install this type of separator at the bottom of the sea, said enclosure must be able to withstand crushing under the effect of the pressure which is substantially 100 bar, or substantially 10 MPa for every 1000m of water, as well as the internal pressure that depends on that of the oil tank and can in some cases reach 1400 bar. Thus the transposition of such a chamber for use in great and very great depth would require wall thicknesses of 100 to 300 mm to resist the implosion and such boiler elements would be very delicate and very expensive to produce and install at the bottom of the sea at great depth.
    [0004] FR 2 915 403 in the name of the Applicant discloses an underwater gas-liquid separation device, but this comprises an enclosure enclosing a set of vertically arranged enclosures fixedly connected to each other of masses and large volumes, this set proving, in some cases, difficult to set up at the bottom of the sea and requiring installation vessels of significant offshore lifting capacity including requiring the implementation of installation vessels of more than 200m long . In addition, internal elements of the enclosure such as the sensors may fail and / or clogged with further possibly a potential risk of clogging the liquid outlet outlets. These incidents require disconnection and usual maintenance boats, which are generally of relatively small size and lifting capacity. In another field, in FR 2 961 712 in the name of the applicant, it has been proposed a modular underwater liquid-liquid separation unit consisting of a plurality of pipes slightly inclined relative to the horizontal in parallel connectable and disconnectable individually at will and which can therefore be installed at the bottom and thus handled, thus limiting the mass of elements to be handled from the surface. An object of the present invention is to provide an improved gas / liquid separation device capable of being installed and operated for maintenance which can not be achieved by recovery of the enclosure individually by the (known under the name "IMR vessel") seabed at great depth, including at least 1000m, which is simpler and less expensive to build, install and operate on the seabed, and more particularly, a facility that can be installed and retrievable with a ship of reduced size and lifting capacity, the maintenance of which can be carried out using a standard size vessel and lifting capacity for offshore installation maintenance and assistance. To this end, the present invention provides a modular underwater installation for liquid / gas separation of two phases respectively liquid and gaseous of a fluid, in particular the liquid and gaseous phases of a crude oil, comprising: (a) a structure main support resting and / or anchored to the seabed to which a plurality of unitary liquid / gas separation devices are connected or reversibly connected, and (b) at least one unitary liquid / gas separation device on said main support structure, each said unit liquid / gas separation device comprising a single enclosure comprising a pressure-resistant sealing wall at the bottom of the sea and the internal pressure of said fluid disposed along an axis of vertical revolution, said enclosure enclosing: b1) a first internal conduit for supplying the multiphase fluid originating in said chamber from its end in comprising or cooperating with a first tubular orifice passing through a part of wall called bottom wall of the enclosure, to its open upper end opening in the upper part of the enclosure, and b2) a second inner pipe of gas evacuation extending within said chamber from its open upper end preferably disposed higher than said upper opening of the first pipe, to its lower end comprising or cooperating with a second annular orifice through the wall of bottom of the enclosure coaxially and preferably around said first fluid supply port, and b3) a third annular orifice passing through said bottom wall of the enclosure coaxially around said first and second annular orifices, and c) a plurality 3-way coaxial connection pieces fixed vertically to said support structure, at least one of said parts connector connected to a said enclosure, each said connection piece comprising: cl) a first vertically disposed connection duct of which an upper end is connected or capable of being connected to a said first tubular orifice, its axial lower end being connected or adapted to be connected to an external supply pipe in said multiphase fluid at the bottom of the sea or a pipe element connected to the end of an external supply pipe in said multiphase fluid at the bottom of the sea, and c2) a second connection duct disposed coaxially and preferably around said first duct at its upper end connected to or connectable vertically to a said second annular orifice tubular orifice, comprising a first lateral outlet orifice connected to or connectable to a duct; external exhaust gas, and c3) a third connection conduit disposed coaxially around said first and second connecting conduits at its upper end connected to or connectable vertically to a said third annular orifice, comprising a second lateral outlet port connected to or connectable to an external liquid discharge line. More particularly, said first and second lateral outlet orifices are oriented in two diametrically opposite directions on each side of the connecting piece and in a direction substantially perpendicular to said vertical axial direction. By "reversibly" connection is meant that the unitary separation devices after connection to the support structure can be disconnected to be raised to the surface and / or to undergo maintenance before being reconnected. Advantageously, said support structure supports valves cooperating with external fluid supply lines, external gas evacuation pipe and respectively external liquid discharge pipe to allow said external pipes to be closed before connection and disconnection of a pipe. said unitary separation device. It is also understood that said first connecting conduit is open at its lower end in axial continuity with its upper opening connected to or connectable to said first central tubular orifice of the enclosure, and, on the other hand, said second and third connecting conduit of the 3-way connection piece are closed at their lower axial ends. The faculty of implementing a plurality of said unitary devices makes it possible to use speakers of relatively small size and weight, and in particular less than 100 T, preferably less than 50 T, so that they can be lowered from the surface to the surface. to a so-called support structure at the bottom of the sea, in particular at great depths of more than 1000 m or even more than 3000m, with standard lift capacity maintenance boats for assistance boats and offshore installation maintenance. Thus, it is possible to increase or decrease the number of unit devices to process a required amount of fluid to be separated or to maintain the surface at will as needed.
    [0005] The coaxial arrangement according to the invention of said first, second and third orifices passing through the bottom wall of the enclosure and said first, second and third conduits of said connecting piece is particularly advantageous for several reasons. Firstly, this coaxial arrangement allows that after connection of the connecting piece with said first, second and third holes in the underside of the bottom wall of said enclosure, a first internal seal between said first conduit of the connection piece and the lower end of said first tubular orifice of the inner fluid supply pipe, is substantially in equipression, being exposed on one side to the pressure P1 within said first internal fluid supply pipe, and the other side substantially the same pressure P1 in said second internal pipe gas discharge. Similarly, a second internal seal between said second conduit of the connecting piece and the lower end of said second annular orifice of the inner gas discharge pipe is exposed on one side to substantially pressure PI in said second inner pipe and the other side within said enclosure outside said second internal gas discharge pipe also substantially at the same pressure Pl.
    [0006] This equipression of the two internal seals is particularly advantageous because the leakage rate of fluid in the event of failure of said seals is relatively negligible. In addition, the risk of seawater leakage in the gas line is extremely low, since the simultaneous failure of the 3 concentric seals would be necessary for this critical event for the gas line to occur. The coaxial arrangement of the connection piece with said first, second and third openings in the underside of the bottom wall of said enclosure is also advantageous for making it easier to connect the enclosure with said connection piece because it allows relative angular rotations of the enclosure along the axial vertical axis of the enclosure and of said connection piece during the descent and the docking of the enclosure on the connection piece, these angular variations occurring frequently in such circumstances and being difficult to prevent. Thus, the docking guidance is simplified requiring no precise angular indexing to achieve this docking.
    [0007] Said second inner pipe and said second connecting pipe may be arranged coaxially inside said first inner pipe and respectively said first connecting pipe, at said first and second annular orifices. However, preferably, said second inner pipe and said second connecting pipe are arranged coaxially around said first inner pipe and respectively said first connecting pipe at said first and second tubular orifices. Indeed, the central axial disposition of the opening at the lower end of said first central duct of said connecting piece is advantageous because it also allows said external supply line to said multiphase fluid at the bottom of the sea or said pipe element connected to the end of an external supply pipe in said multiphase fluid at the bottom of the sea, has a radius of curvature sufficiently high (without making a T-bend) at its junction with the connecting piece with respect to the axial direction ZZ 'of fluid flow within said connection piece and said first axial inner pipe so as not to disturb this flow and thus avoid shearing the fluid to avoid splitting of gas bubbles and / or liquid droplets making the subsequent gas-liquid separation more difficult, before the phase separation within the upper outlet chamber of the first conduct. Preferably, said support structure resting at the bottom of the sea supports at least one device for dividing and distributing the multiphase fluid having a single main tubular axial supply orifice arranged preferably vertically, whose open bottom end is connected or connectable to the end of an external supply pipe in said multiphase fluid at the bottom of the sea, and whose open axial upper end communicates with a plurality of tubular secondary outlet orifices inclined with respect to said axial direction, of same diameter and inclined at the same angle (beta) and arranged symmetrically and regularly with respect to and around said axial direction, the said tubular outlet secondary orifices being connected or able to be connected to a plurality of elements of supply fluid transfer line connected or able to be connected respectively a plurality of said first central duct said connecting pieces connected or adapted to be connected to lower ends of a plurality of said enclosures. Preferably, said connecting pieces and said enclosures are disposed with respect to said dividing device, preferably above and around said dividing device, so that the pressure drops between said dividing device and said enclosures are substantially identical between them. More preferably, said connecting pieces and said enclosures are arranged symmetrically with respect to said dividing device above and around said dividing device.
    [0008] It is understood that the said tubular secondary outlet orifices have a smaller diameter than that of said main tubular axial supply port. Thus, the multiphase feed fluid flow is divided into a plurality of flows of the same flow rate, the flow rate of each divided flow thus becoming less than the main flow arriving through the main external supply pipe. This fluid flow-splitting device is advantageous because it makes it possible to distribute in equal parts and to homogenize the fluid sent within the different unitary separation devices in terms of composition and in terms of the losses of loads experienced by the fluid within the said transfer driving elements.
    [0009] More particularly, said enclosure is integral with first guiding elements of the male or preferably female type, arranged outside said enclosure, and said support structure comprises second guiding elements, of the female or male type cooperating respectively or capable of cooperating with said first complementary guiding elements to achieve a vertical docking of said unitary device in front of a said connecting piece. It is understood that these first and second guide elements make it easier to achieve the coaxial connections of said upper ends of said first, second and third conduits of the connection piece with said first, second and third holes through the bottom wall respectively. of the enclosure descended from the surface. More particularly, said enclosure comprises a cylindrical side wall with a circular section, whose upper end is closed by a domed cap, preferably spherical and whose bottom wall of fund at its lower end is funnel-shaped tapering towards the down to form a vertical tubular bottom wall delimiting said third annular liquid discharge port. The funnel shape facilitates the evacuation of solid sedimentation including sand. More particularly, said first internal pipe for supplying the multiphase fluid extends vertically, preferably substantially in the axis of said enclosure, inside said second internal pipe below an upper part of the first inner pipe, which upper part of the first internal duct forms a turning loop, outside of said second internal duct, in particular a multi-curved loop in the shape of a gooseneck, terminating in a fluid outlet nozzle, preferably with a flared wall defining a said upper opening of the said first internal duct, more preferably of flattened section, so that the said upper opening of the first duct opens near the side wall of the enclosure and that the fluid flows parallel to said cylindrical side wall and oriented in a downwardly inclined direction, and the said second internal gas discharge pipe extends axially coaxially with said first inner pipe below said upper portion thereof. The flattened shape of the section of said opening of said nozzle causes a laminar flow of fluid pressed against the wall of the enclosure. On the other hand, the expanded flaring shape of the wall of said nozzle slows the flow velocity of the fluid at the outlet of the fluid supply line. And this slowing down of the fluid as well as its tangential flow to the lateral wall of the multiphase fluid enclosure at the outlet of said nozzle by the centrifugal force it undergoes, prevent the shock of the fluid against the wall and promote the separation into two gas phases and liquid of said fluid by minimizing the fractionation of the gas bubbles, as well as the projection of drops of liquid to the suction port of said internal gas discharge pipe. Preferably, to minimize the fractionation of the gas bubbles, said outlet nozzle at the upper end of said first inner pipe is further oriented inclined downwards by an angle substantially identical to that of the helical discharge gutter. liquid described below. In a preferred embodiment said first inner pipe and second inner pipe have coaxial portions of larger diameters than their respective lower portions. Said first inner pipe has indeed an intermediate portion of larger diameter in the middle portion so as to contribute to a slowing of the fluid flow velocity within said first pipe, the second coaxial inner pipe also undergoing the same enlargement of diameter vis-à-vis said first inner pipe, for maintaining an annular space between said first and second internal pipes substantially constant. More particularly, the enclosure comprises a helical gutter fixed near and / or against the inner surface of said side wall of the enclosure and whose upper end is against the bottom opening of the first inner pipe and the lower end arrives above said third annular orifice. In one embodiment, said helical gutter is attached to said second inner pipe.
    [0010] The said helical gutter makes it possible to promote the liquid-gas separation by increasing the residence time of the partially degassed fluid to go down to the bottom of the enclosure and to channel the evacuation of the said liquid separated from the said gas at the outlet of the said nozzle towards the said third peripheral annular orifice. These features, combined with the implementation of a flared outlet nozzle as described above, also allow the speed of partially degassed fluid particles flowing downwardly within said enclosure to be reduced. relative to the speed of the raw fluid particles entering said first inner pipe.
    [0011] More particularly, the enclosure contains in its upper part a device for filtering liquid droplets, preferably a coalescing device, on the gas path between the upper opening of the first inner pipe and the upper opening of the second pipe. internal pipe. In this way this type of coalescer device is of the sieve type (also called "debrisizer" or in English "demister") and performs a filtering liquid droplets that can be driven by the gas. More particularly, the enclosure contains pressure sensing sensors and liquid level sensor within the enclosure, preferably a level control device which is a radar or sonar type sensor or a nucleon level sensor constituted a beam emitting bar and one or more measurement bars for measuring the density profile of the fluid over the entire height of the enclosure. Such a sensor, known to those skilled in the art, here makes it possible to control that the level of liquid that arrives above the lower opening of said third orifice of the first internal pipe and does not exceed above the upper opening of the second internal gas discharge pipe, that is to say sufficiently far from said upper openings of said first and second internal pipes.
    [0012] More particularly, the enclosure is formed of two enclosure parts fixed to each other comprising: - an upper wall portion comprising at its upper end a domed spherical cap preferably spherical, and - a lower wall portion comprising a said bottom wall.
    [0013] This feature makes it possible to facilitate the maintenance of the elements inside the enclosure, such as the coalescer device, the sensors, said first and second internal ducts, the helical gutter, by accessing them by disconnecting the two parts of the wall of the housing. the enclosure, and if necessary by going back to the surface the only upper part of the enclosure and the equipment that is fixed to it, to carry out their maintenance. More particularly, said support structure comprises a plurality of said connecting pieces and said enclosures connected thereto, preferably at least 4 said connecting pieces, preferably arranged symmetrically. According to other particular characteristics: the said enclosure is of elongated shape with a circular section whose upper end is in the form of a partial spherical cap, of the cigar type, arranged vertically; the shape of said enclosure gives it good resistance to hydrostatic pressure at the bottom of the sea, allowing to implement walls of only 10 to 300mm thick; the length L1 of said enclosure is greater than or equal to 10 times its diameter D1, preferably 15 to 30 times its diameter D1; L1 being more preferably from 5 to 50m and its diameter D1 from 0.5 to 5m; this dimensioning of the diameter and wall thickness ensures optimum compressive strength at great depth for the walls of said pressure-resistant enclosure; - The opening at the upper end of said second inner pipe is located at a height h relative to the upper opening of said first inner pipe of at least 1 m. The present invention also relates to a unitary liquid / gas separation device of two phases respectively liquid and gaseous fluid, useful in a modular installation as defined above.
    [0014] The subject of the present invention is also a method for producing a modular installation according to the invention, characterized in that the following successive steps are carried out in which: a) a said unitary device suspended from a ship is lowered surface, and b) preferably, it guides its docking approach with a said connection piece fixed on said support structure, with the aid of first guide elements integral with said enclosure and said second solidarity guide means of said support structure, said second guide elements cooperating with said first guide elements, and c) connecting said enclosure to a said connection piece, in a disconnectable manner, by means of a fixing flange and coaxial seals between said first, second and third tubular orifices passing through the bottom wall of the enclosure and said first, second and respective third connecting conduits of said connection piece.
    [0015] The subject of the present invention is also a process for separating the two liquid and gaseous phases of a crude oil by means of a modular installation according to the invention, characterized in that the following steps are carried out in which : 1) the crude oil is sent, via an inlet pipe, to said first central tubular orifice of said enclosure via and through said first central conduit a said connection piece, at a reduced pressure P1 , below the static pressure at the bottom of the sea P2, and 2) the crude oil rises within said first internal pipe enclosure, then flows at the upper outlet of said first inner pipe in flow tangential to the side wall with a circular section of the chamber which causes its separation into a liquid phase and a gaseous phase, then 3) the partially degassed liquid or fluid phase descends to the said third annular orifice to the lower end of the enclosure, and preferably fills said enclosure to a height level below the upper opening of said first inner pipe, and is recovered at an external pipe of discharging liquid connected to said second lateral orifice of said connecting piece, and 4) the gas separated from said oil is sucked into said second inner pipe towards said second annular orifice at the lower end of the enclosure, and retrieves it at an external gas evacuation line connected to said first lateral orifice of said connecting piece. Other features and advantages of the present invention will become apparent in the light of the detailed description of the embodiments which follows, with reference to FIGS. 1 to 4: FIG. 1 represents a view of a descent of a unitary device separation device 1 for its docking and connection to a support structure 10 resting at the bottom of the sea and on which two unitary separation devices 1 are already connected, the various connection pieces 6 being connected to a flow-splitting device 12 fed by a crude oil supply line 13 connected to a wellhead 18, and - Figure 1A shows a top view of a modular installation comprising a support structure 10 resting at the bottom of the sea to which are connected eight unit devices 1 and 1B is a schematic view of an underwater liquid-gas separation system according to the invention. showing a single unitary separation device of which said first internal pipe 2 for supplying multiphase fluid and second internal pipe 3 for evacuation of gas are schematized side by side and not coaxially as in the invention, in order to better differentiate them and show the differentiated outputs of the multiphase fluid supply external conduits 13 on the one hand, and external liquid evacuation conduit 15 and external gas evacuation conduit 16 cooperating with valves 11a, 15b and 16b respectively, and - Figure 2 shows a longitudinal sectional view of a unitary gas-liquid separation device 1 according to the present invention comprising said first internal pipe 2 for supplying phasic fluid and said second inner pipe 3 gas evacuation arranged coaxially and connected at their bases to a connecting piece 6, and - Figure 2A is a view showing the exit and the winding of the upper part 2b of said first inner pipe outside and around said second inner pipe, and - Figure 2B is a schematic horizontal sectional view of Figure 2A in plan view above the outlet nozzle 2c fluid at the upper end 2b of the first fluid supply pipe 2, and - Figure 3 shows a vertical axial sectional view of the three-way coaxial connecting piece 6 according to the invention connected via annular seals 7 -1, 7-2, 7-3 to the tubular lower part 1c-2 of the bottom wall 1c of the chamber 1 of Figure 2, and - Figure 4 shows a perspective view of a dividing device 12 of multiphase fluid flow having six upper outlet ports 12b1 to 12b6, and - Figure 4A is a sectional view along a vertical median axial plane of the dividing part 12 of Figure 4. The main support structure 10 is bottom of the sea 20 being f affixed to a base resting at the bottom of the sea 20 or a suction anchor 14 driven to the bottom of the sea, this main support structure 10 consists of a frame formed of lattice girders.
    [0016] The main support structure 10 is disposed near an oil well 18 equipped with a well head 18a connected by a crude oil supply pipe 13 conveying the crude oil from the wellhead to said support structure 10. Said support structure 10 supports: - a plurality of vertical guide rods 10a forming said second guide elements, and - a plurality of three-way coaxial connection pieces 6, and - at least one flow-splitting device 12, and closing / opening valves of the following external conduits: a valve 11a controlling the arrival of multiphase fluid upstream of said connection piece 6, a valve 15b controlling the evacuation of the liquid within the external evacuation pipe of liquid 15, and a valve 16b for controlling the evacuation of gas within the external gas evacuation pipe 16, and an export pump 17 for discharging liquid via the external liquid discharge pipe 15. Said main support structure 10 also advantageously supports portions of pipes connected to or connected to the ends of said outer multiphase fluid inlet pipe 13, external vent pipe degassed liquid 15 and external gas evacuation pipe 16, said pipe portions being connected directly or indirectly to the lateral tubular orifices 6b1 and 6c1 and central lower tubular orifice 6a1 of the connecting piece 6 described hereinafter.
    [0017] The unitary separation device 1 as shown in the figures comprises an enclosure 1a whose wall comprises a cylindrical running portion with a circular section surmounted by a curved bottom, such as a spherical cap, and terminating at its lower end by a bottom wall 1c comprising a funnel-shaped upper part 1c1 and a cylindrical lower part 1c-2 of smaller diameter delimiting or extending by a part forming said first, second and third coaxial tubular orifices 5a, 5b, 5c described herein. -after.
    [0018] The cylindrical wall of the enclosure 1a is equipped on the outside with a frame 8 supporting said first guide elements 8a defining openings delimited at the bottom by funnel-shaped flared walls to facilitate their passage through the guide rods 10a. the main support structure 10 for guiding the enclosure 1 when it is lowered from the ship 24 at the surface 25 by means of a cable 19 and possibly a ROV 26 (submarine robot operated by remote control to distance). The frame 8 comprises feet 8b making it possible to mechanically stabilize the unitary device 1 resting on the main support structure 10 and / or to fix it on the main support structure 10 after docking and connection to the connecting piece 6 as described hereinabove. after. The complementary guiding elements 8a and 10a can also be used for fastening the unitary device 1 after docking on the main support structure 10 and attachment to the connection piece 6. Said first guide elements 10a are positioned relative to the connecting pieces 6 fixed on the support structure 10 such that when the enclosure 1 is lowered to be approached on the main support structure 10 by cooperating said first and second complementary guide means 8a and 10a, the tubular lower part 1c-2 of the bottom wall 1c and / or the part enclosing said first, second and third coaxial orifices 5a, 5b and 5c, described hereinafter, these arrive vertically and in coincidence with the upper ends of the first, second and third conduits; 6a, 6b and 6c respectively of the connecting piece 6 described below. In Figure 1A, there is shown eight speakers arranged vertically parallel, arranged in a square with three speakers per side, a flow splitting part 12 being disposed in the central axis of the square down. FIG. 4 shows a flow-splitting part 12 consisting of: a single main lower tubular supply orifice 12a arranged vertically when it is fixed on the main support structure 10, whose open bottom end 12a1 is connected to the end of an external multiphase fluid supply pipe 13, and a plurality of upper outlet tubular secondary orifices 12b arranged in an inclined manner, here comprises six orifices 12b1 to 12b6, able to supply only six pregnant, but they could contain eight inclined outlet tubular secondary orifices 12b to supply eight speakers as shown in FIG. 1A. The open upper ends 12c of said secondary tubular outlet ports 12b1 to 12b6 are respectively connected to a plurality of transfer line elements 11, the latter being connected at their other end to the lower end of the first central ducts 6a of the different connection pieces 6 of the different fluid separation unit devices 1 fixed on the main support structure 10.
    [0019] In FIG. 1B, the pipe 13 is shown as being bent to connect in the vertical axial direction of the lower supply tubular orifice 12a of the flow-dividing part 12 shown in FIG. 4, in order to facilitate the representation. However, in reality, it is avoided to form a bend in the multiphase fluid supply external conduit 13 supplying the dividing part 12. The flow-dividing part 12 is indeed arranged at a height relative to the seabed 20 so that the end of the multiphase fluid supply external pipe 13 connected to the lower end 12a1 of the part 12 has a radius of curvature sufficient to avoid splitting the phases of the multiphase fluid that it conveys. Similarly, the inclination of an angle 13 = 30 ° of said upper outlet tubular secondary holes 12b1 to 12b6 as well as the length and shape possibly double curvature with a median point of inflection of the elements of transfer lines 11 contribute to allow to respect radii of curvature in the elements of transfer lines 11 to avoid again the fractionation of the liquid and gaseous phases of the multiphase fluid. The diameters of the different upper outlet tubular secondary orifices 12b1 to 12b6 are smaller than that of the lower main orifice 12a, but the sum of the diameters of the different secondary orifices 12b is equal to that of the lower main orifice 12a, so that the flow rates at the inlet and the outlet of the distributor are all identical. In Figure 2, there is shown a unitary separation device according to the present invention, the enclosure takes a wall is formed of 2 parts, namely: - an upper part la-1 consisting of the cylindrical running portion with circular section surmounted by a spherical cap lb, and - a lower portion la-2 whose upper face forms a fastening flange with screws la-3 with the underside of the upper part la-1, fastened together with the using the screw-3.
    [0020] The lower part la-2 of the wall of the enclosure defines at its lower end a funnel-shaped bottom wall 1-1 extending at its lower end by a cylindrical portion 12a-2 of reduced diameter D2 relative to to the diameter D1 of the cylindrical portion of the enclosure 1a, D2 being, for example, less than 1/4 of D1, and D1 being for example 0.5 to 3 meters for a length L1 of enclosure 5 to 30 meters . The cylindrical wall 1-2 defines an annular orifice for discharging the liquid contained inside said enclosure, called the third annular orifice 5c.
    [0021] A first inner pipe 2 is disposed in its common part, with the exception of its bent upper part 2b described below, vertically and axially along the axis ZZ 'in the center of said enclosure. Its lower end terminates or is extended by a first central orifice 5a coaxially passing through the lower cylindrical portion 1c-2 of the bottom wall. At approximately mid-height of the enclosure, the first internal pipe 2 comprises a flare 2a 'and then a section of first pipe of larger diameter 2' ending at its upper end by a turning turn or multi-curvature loop shaped gooseneck 2b such that the outlet nozzle 2c at the open upper end 2a of the first inner pipe 2 comes close to and parallel to the inner surface of the cylindrical wall la as described hereinafter. The nozzle 2c has a side wall 15 flared so that its opening 2a is wider than the diameter of the end of the loop of the upper part 2b of the first inner pipe to which said nozzle 2c is adapted. The function of flaring and widening of the section 2 of the first duct relative to the lower portion of the smaller diameter inner duct is to reduce the velocity of the multiphase fluid in the first duct. The flaring of the side wall of the nozzle 2c also has the effect of reducing the fluid velocity at the outlet of the pipe 2. In FIGS. 2A and 2B, the curved profile in horizontal section of the upper part is shown. 2b and the nozzle 2c at the end of the upper portion 2b of the bent portion of the first inner pipe 2 outside and around the upper axial portion 3b of the second pipe 3 terminating in the opening 3a. This curved profile having a profile parallel to that of the cylindrical wall 30 of the enclosure, combined with a vertically rectilinear nozzle of the upper opening 2a with a flattened section at the end of the nozzle 2c has the effect to produce a flow of the fluid at the outlet of the first tangential blade-shaped duct 2 to the inner wall of the cylindrical wall 1a of the enclosure and thus to minimize the destructuration of the multiphase fluid to avoid the fractionation of the gas bubbles which is harmful to the separation and the projection of drops of liquids that could be entrained in the gas outlet opening. Thus the multiphase fluid is plated at the cylindrical inner wall of the chamber at the outlet of the nozzle 2c, by the centrifugal forces that result from the swirling flow against the cylindrical wall of the enclosure. Then, the liquid part of the multiphase fluid will descend by gravity into the intermediate portion 1-2 of the enclosure into the lower part 1-3 which will fill with liquid to a certain height hl, before and / or during its flow by the third annular liquid discharge orifice 5c. The gaseous part of the multiphase fluid, lighter, will rise towards the upper part 1-1 of the chamber, at the outlet of the nozzle 2c, to be discharged through the upper end 3a of a second internal discharge pipe 3. gas described below. For the evacuation of the liquid, in a preferred embodiment, shown in Figure 2, the chamber comprises a helical gutter 4 fixed against the inner surface of the cylindrical wall of the chamber 20 whose upper end 4a arrives below the nozzle outlet 2c and whose lower end 4b just above the funnel bottom portion 1c-1 of the bottom wall of the enclosure. The pitch of the helix of the helical gutter 4 is such that it is inclined at an angle α with respect to the horizontal substantially identical to the angle of inclination towards the bottom of the direction YY 'of the flow fluid leaving the opening 2a of the nozzle 2c. A second internal pipe 3 for gas evacuation extends vertically and axially in the center of the enclosure, arranged in its lower part coaxially around the central part 2 'of larger diameter and the lower part 2' of smaller diameter of the first inner pipe 2. The second inner pipe 3 thus comprises a median part of larger diameter 3 'so as to follow the widening of the middle portion 2' of the first pipe 2, so that the width of the annular space between the first inner pipe 2 and the second inner pipe 3 remains substantially identical The lower end of the second inner pipe 3 defines or is extended by a second tubular orifice called second annular orifice 5b of gas discharge coaxially and around the first central orifice 5a at the lower end of said second inner pipe 2. Said third annular orifice 5c in the former lower end of the cylindrical lower part the-2 of the bottom wall delimits an annular space around the second inner pipe 3 for the evacuation of liquid from the lower part 1-3 of the enclosure. The upper end 3a of the second inner pipe 3 comes close to the lid of the enclosure constituted by the spherical cap 1b at a height h of 1 to 2 meters above the opening 2a of the nozzle 2c at the upper end of the first inner pipe 2. In the upper part 1-1 of the inside of the enclosure on the gas path, between the upper opening 2a of the first 2a of the first inner pipe 2 and the upper opening 3a of the second inner pipe 3, there is a coalescing device 9 of 20 liquid droplets entrained by the gas which allows, in combination with the upper disposition of the opening of the upper end 3a of the second inner pipe 3, to prevent fine droplets of liquid from being entrained with the gaseous phase evacuated by the second inner pipe 3. The cleaning of this coalescence device 9 is made possible by the possibility of it is disconnected from the two parts la-1 and la-2 of the enclosure when it has been reassembled for maintenance on the surface with the equipment that is integral with it. Said chamber is also traversed by pressure sensors and liquid level sensor 20-21, 22. It is possible to use more particularly nucleic-level sensors consisting of a beam-emitting bar and one or more bars. of measurements disposed vertically within the chamber whose known function is to determine the density profile of the fluids over the entire height of the chamber to be able to deduce the level of the interface 1-4 gas-liquid within the enclosure. These bars are housed in waterproof sheaths and resistant to pressure and crossing the top of the enclosure. Sealing plugs 22a operable by an underwater robot 26 close the tube tubes of said detection bars and can be opened for the recovery of said detection bars for surface maintenance. In another embodiment, the sleeves of the various sensor bars 21, 22 pass through the bottom wall 1c of the enclosure and are not connected to the upper part of the enclosure so that the recovery of the detection bars is then made by disconnection and recovery of the complete enclosure 1. The separation chamber 1 has lifting points preferably in the upper part which may be 1d lifting lugs integrated into the wall of the enclosure or recesses or bosses practiced in the wall of the enclosure to serve as a scope for a lifting clamp to cap the upper part of the wall of the enclosure. It is also possible to place the waterproof enclosure in a metal frame that will carry the lifting points.
    [0022] In Figure 3, there is shown the lower portion 1c-2 of the bottom wall which terminates in an intermediate part 5 welded to the lower end of the cylindrical lower part 1c-2 of the bottom wall 1c. This part 5 of the lower end of the cylindrical portion 1c-2 forms and delimits a first tubular central opening 5a of fluid supply of the first inner pipe 2, a second annular orifice 5b coaxial delimiting an annular space around the first orifice tubular 5a in extension of the lower end of the second inner pipe 3, annular space 5b through which the gas coming from the upper end 3a of the second inner pipe 3 is discharged to the outside of the enclosure 1, and a third annular tubular orifice 5c also coaxial delimiting an annular space around the second annular tubular orifice 5b, said third annular orifice 5c being delimited by the outer wall of the part 5 or the lower part of the cylindrical portion 1c-2.
    [0023] The lower end of this lower part 5 forms a fastening flange 5-1 capable of being reversibly fixed by fastening jaws 7 (not shown in FIG. 3) with the upper end 6-1 of the part of FIG. connection 6. Coaxial metal seals 7-1, 7-2, 7-3 are interposed between the lower end 5-1 of the workpiece 5 and the upper end 6-1 of the connecting piece 6 The connecting piece 6 is made in three parts 6-1, 6-2 and 6b2 welded to one another. An inner portion 6-2 of the part 6 comprises a first central duct 6a arranged axially, vertically. This first central duct 6a is in extension and continuity of said first tubular orifice 5a after connection of the piece 6 by the fixing jaws 7 to the lower end of the piece 5. The lower end 6a-1 of the first central duct 6a of the connecting piece 6 is connected to the end of a transfer pipe element 11 or directly to the end of an external multiphase fluid supply pipe 13. Around the first central pipe 6a, the inner part 6-2 of the connecting piece 6 forms a second annular duct 6b coaxial with the first duct 6a, and whose upper end communicates with the second annular orifice 5b of gas evacuation of the room 5. The second annular duct 6b is closed at its lower end 6b-2 and has a first lateral gas outlet orifice, of axis XiXi perpendicular to the axis ZZ 'of the connection piece 6, allowing connection to the end of an external gas discharge duct 16. Around the second annular duct 6b, the outer portion 6-1 of the connection piece 6 delimits and forms with the inner part 6-2, a third annular duct 6c of liquid discharge whose upper end communicates with the third annular orifice 5c of the part 5 to allow the evacuation of liquid. The third discharge duct 6c of the connection piece 6 is closed at its lower end 6c-2 and has a second lateral liquid outlet orifice 6c-1, of axis X2X2 'perpendicular to the axis ZZ', and connected to the end of an external liquid discharge pipe 15. The bottoms of the annular spaces 6b and 6c may be helically shaped 6d in order to collect and force the flow of solid particles of sand that can be conveyed with the liquid part of the multiphase fluid to avoid any accumulation of solid particles (sand ...) that could clog the pipes. The crude oil arrives under the well head 18a at high pressure, for example 100 to 200 bar. The wellhead 18a may be equipped with a pressure relief device and an automated flow control valve controlled from the surface and connected to the external oil supply line 13 which comes under reduced pressure, for example 20 bars, at the flow division part 12. The slowing of the fluid upstream of the separator is made to avoid too violent flows into the enclosure and thus avoid disrupting the separation. The crude oil enters the enclosure via the first internal pipe 2 and discharges and separates its liquid and gaseous phases at the upper end 2a of the first conduit The pressure drop is at the wellhead, the pressure is at about constant in the separation station. The liquid portion fills the bottom of the chamber to a level 1-4 whose height is controlled by the level sensors 21-22 and regulated by the export pump 17 liquid discharge via the external conduit5.
    [0024] The open upper end 3a of the second inner pipe 3 is disposed at a height h of 1 to 2 meters (s) above the end of the opening 2a of the second pipe 2, so that projections of plugs of petroleum or liquid petroleum parts caused by the sudden arrival of large gas pockets at exit 2a of line 2 does not reach the upper end 3a of the second line 3. The degassed liquid petroleum, recovered in part the bottom of the enclosure is directed via the outlet port 6-1 of the connecting piece 6 to the external liquid discharge pipe 16 can be sent to a floating support surface or a secondary water / oil separator at the bottom from the sea so that the oil is sent to the surface, the water being either reinjected into a well similar to the well 18, or simply released at sea, to the extent that it is acceptable cleanliness, it is -to-dir e a sufficiently small amount of residual particles of crude oil. The evacuation of liquid can be controlled by means of an export pump 17. Similarly, the gas evacuated via the external gas evacuation pipe 15 can be sent to the surface or recompressed at the seabed. then reinjected into a well similar to the well 18. More particularly, said crude oil is sent to the lower end of said first internal pipe, preferably such that the pressure differential txP = P1-PO, PO being the pressure of arrival of the gas line at the surface FPSO, greater than the pressure losses in the external gas evacuation pipe from said first lateral orifice to the surface. This makes it possible to raise the surface gas without additional equipment and / or without providing additional external energy, especially without the use of a compressor.
    [0025] Preferably, the raw fluid inlet flow rate is controlled upstream of said connection piece by a flow control valve and / or the discharge flow of the degassed fluid downstream of said connection piece 6 is checked by a flow control valve and / or the speed of said export pump 17 as a function of the measurements of at least one said fluid level control device within said enclosure so that the level of liquid at the bottom of the enclosure remains sufficiently far from the inputs / outputs of the separator. More particularly, said support structure is installed at the bottom of the sea, at a depth of 100 to 4000 m and a pressure P1 of 10 to 50 bar (10 x105 to 50x105 Pa), preferably 20 bar (20x105 Pa) is established. within the said enclosure. Preferably, said enclosure is thermally insulated .This embodiment makes it possible to maintain the crude oil fluid at the elevated temperature of 40 to 100 ° C., or even more, at which it leaves the wellhead, and thus to facilitate the surface rise of the fluid, avoiding the solidification of the paraffins or the formation of gas hydrates by cooling the crude oil below 30-35 ° C, which can create plugs and blockages within the inner pipe 2. In When the production is stopped, the thermal insulation of the enclosure also makes it possible to maintain the internal temperature of the enclosure as long as possible above the critical temperature of formation of gas hydrates, thus leaving time for operator to carry out the preservation operations necessary to mitigate this risk.
    [0026] The possibility of depositing and connecting additional unitary separation devices 1 on the main support structure 10 resting at the bottom of the sea from a surface vessel 25, makes it possible to adapt the separation capacities of the crude oil at the bottom of the sea to the sea. over time and also allows, advantageously, to provide surface maintenance by disconnecting and lifting unitary separation devices 1 from a ship 24 in surface 25. Given the possibility of implementing relatively smaller speakers account sizes Given their greater number, the handling of the speakers from the surface, can be performed by standard size boats used for the assistance and maintenance of offshore oil installations, without resorting to excessive lifting capacity. An essential advantageous characteristic of the invention consisting in the coaxial arrangement of the fluid and gas phase and liquid phase outputs at the lower end of the enclosure via a three-way coaxial connection piece 6 facilitates the installation. and connecting the unitary separation devices 1 at the main support structure 10 at the seabed, as well as the maintenance of the unitary device 1, as explained above.
    [0027] Indeed, the coaxial arrangement of the various internal conduits for fluid supply and separate evacuation of the gaseous and liquid phases allows the seals 7-1, 7-2, 7-3 of sealing, in this case joints metal, between the lower end of the orifices 5a, 5b, 5c of the bottom wall 1c of the chamber 1 and the different ducts 6a, 6b, 6c of the connecting piece 6 at its upper end, remains in equipression s' acting on the two internal seals 7-1 and 7-2 thus avoiding degradations at said seals in case of pressurization or depressurization of the enclosure during these disconnections or various maintenance, as explained above. 30
    权利要求:
    Claims (14)
    [0001]
    CLAIMS1 - Modular underwater installation liquid / gas separation of two phases respectively liquid and gaseous fluid, including liquid and gaseous phases of a crude oil, comprising: (a) a main support structure (10) resting and or anchored to the sea bed (20) to which a plurality of unitary liquid / gas separation device (1) are connected or reversibly connected, and (b) at least one unitary device (1) of liquid / gas separation 10 fixed on said main support structure (10), each said unitary liquid / gas separation device (1) comprising a single enclosure comprising a watertight pressure-resistant wall (1a) of the seabed and the internal pressure of said fluid disposed along an axis of vertical revolution (ZZ '), said enclosure enclosing: b1) a first internal conduit (2) for supplying the multiphase fluid originating in said enclosure from its lower end comprising or cooperating with a first tubular orifice (5a) passing through a part of the wall called bottom wall (1c) of the enclosure, until its upper open end (2a) opening at the top (1- 1) of the chamber, and b2) a second internal gas evacuation pipe (3) extending within said chamber from its open upper end (3a) preferably disposed higher than said upper opening (2a) of the first conduit, to its lower end 25 comprising or cooperating with a second annular orifice (5b) passing through the bottom wall (1c) of the enclosure coaxially and preferably around said first orifice (5a) of supplying fluid, and b3) a third annular orifice (5c) passing through said bottom wall of the enclosure coaxially around said first and second annular orifices (5a, 5b), and 31 a plurality of connecting to 3 coaxial channels (6) fixed vertically on said support structure (10), of which at least one said connection piece connected to a said enclosure (1), each said connection part comprising: cl) a first connection duct (6a) disposed vertically, an upper end of which is connected or adapted to be connected to a said first tubular orifice, its axial lower end (6a1) being connected or able to be connected to an external supply pipe in said multiphase fluid (13) at the bottom of the sea or a pipe element (11) connected to the end of an external supply pipe in said multiphase fluid (13) at the bottom of the sea (20), and c2) a second connecting pipe (6b ) disposed coaxially and preferably around said first conduit at its upper end connected to or connectable vertically to a said second annular orifice tubular orifice (5b), comprising a first orifice lateral outlet (6b1) connected or adapted to be connected to an external gas discharge line (15), and c3) a third connection duct (6c) arranged coaxially around said first and second connection ducts (6a, 6b ) at its upper end connected or capable of being connected vertically to a third said annular orifice (5c), comprising a second lateral outlet orifice (6c1) connected to or connectable to an external liquid discharge line (16) .
    [0002]
    2. Modular installation according to claim 1, characterized in that said support structure (10) resting at the bottom of the sea supports at least one dividing device and distribution (12) of the multiphase fluid having a single main tubular axial feed hole. (12a) preferably arranged vertically, whose open bottom end (12a1) is connected to or connectable to the end of an external supply pipe for said multiphase fluid (13) at the bottom of the sea (20), and whose open axial upper end (12a2) communicates with a. plurality of tubular secondary outlet orifices (12b, 12b1 to 12b6) 32 3016802 inclined with respect to said axial direction, of the same diameter and inclined at the same angle (f3) and arranged symmetrically and regularly with respect to and around the said axial direction, said tubular secondary outlet ports (12b1 to 12b6) being connected to or connectable to a plurality of connected or connectable feed fluid transfer line elements (11). respectively to a plurality of said first central ducts (6a) of said connecting pieces (6) connected or connectable to the lower ends of a plurality of said enclosures (1).
    [0003]
    3. Modular installation according to claim 2, characterized in that said connecting pieces (6) and said enclosures (1) are arranged relative to said dividing device (12), preferably above and around said dividing device (12), such that the pressure drops between said dividing device (12) and said enclosures (1) are substantially identical between each other, preferably, said connecting pieces (6) and said enclosures (1) being disposed symmetrically with respect to said dividing device (12) above and around said dividing device (12). 20
    [0004]
    4. Modular installation according to one of claims 1 to 3, characterized in that said enclosure is secured to first guide elements (8a) of the male type or preferably female, arranged outside said enclosure, and said support structure (10) comprises second guiding elements (10a), of the female or male type respectively, cooperating or capable of cooperating with said first complementary guiding elements for vertical docking of said unitary device opposite a said connecting piece (6).
    [0005]
    5. Modular installation according to one of claims 1 to 4, characterized in that said enclosure comprises a cylindrical side wall (1a) of circular section, whose upper end is closed by a domed cap preferably spherical (lb ) and whose bottom end wall (1c) is funnel-shaped (1c1) narrowing downwards to form a vertical tubular bottom wall (1c2) delimiting said third annular liquid discharge orifice (5c). 5
    [0006]
    6. Modular installation according to one of claims 1 to 5, characterized in that said first internal conduit (2) for supplying the multiphase fluid extends vertically, preferably substantially in the axis of said enclosure, to the interior of said second inner pipe (3) below an upper portion (2b) of said first inner pipe, which upper portion (2b) of said first inner pipe forms a reversal loop, outside said second pipe internally, preferably terminated by a flared wall fluid outlet nozzle (2c) defining a said upper opening (2a) of said first inner duct, more preferably with a flattened section, so that said upper opening (2a) of the first conduit opens near the side wall (1a) of the enclosure so that the fluid flows parallel to said cylindrical side wall and oriented d in a direction (YY ') inclined (a) downwards, and said second internal gas discharge pipe (3) extends axially coaxially with said first internal pipe below said upper portion (2b) thereof, preferably said first inner pipe (2) and second inner pipe (3) having coaxial portions (2 ', 3') of larger diameters than their respective lower portions (2 ", 3"). 25
    [0007]
    7. Modular installation according to one of claims 1 to 6, characterized in that the enclosure comprises a helical gutter (4) fixed close to and / or against the inner surface of said side wall of the enclosure and of which the the upper end is against the bottom of the upper opening of the first inner pipe and the lower end is above said third annular orifice (5c).
    [0008]
    8. Modular installation according to one of claims 1 to 7, characterized in that the enclosure encloses in its upper part (1-1) 34 3016802 a device for filtering liquid droplets, preferably a coalescence device (9 ), in the gas path between the upper opening (2a) of the first inner pipe and the upper opening (3a) of the second inner pipe. 5
    [0009]
    9. Modular installation according to one of claims 1 to 8, characterized in that it contains pressure sensing sensors and liquid level sensor (21,22) within the enclosure, preferably a device of level control which is a radar or sonar type probe or a nucleon level sensor consisting of a ray emitting bar (21) and one or more measuring rods (22) for measuring the density profile of the fluid on the whole height of the enclosure.
    [0010]
    10. Modular installation according to one of claims 1 to 9, characterized in that the enclosure is formed of two enclosure parts 15 fixed (la-3) to each other comprising: - an upper part of wall (1a-1) comprising at its upper end a domed cap, preferably spherical (1b), and - a lower wall portion (la-2) comprising a said bottom wall (1c). 20
    [0011]
    11. Modular installation according to one of claims 1 to 10, characterized in that said support structure (10) comprises a plurality of said connecting pieces and said enclosures (la) connected thereto, preferably at least 4 said connecting pieces, preferably arranged symmetrically. 25
    [0012]
    12. Unit device liquid / gas separation of two phases respectively liquid and gaseous fluid, useful in a modular installation as defined in one of claims 1 to 11 characterized in that said unitary device (1) separation liquid / gas comprises a single enclosure comprising a sealed wall (1a) resistant to the pressure of the seabed and to the internal pressure of said fluid disposed along an axis of vertical revolution (ZZ '), said enclosure enclosing: 3016802 1 ) a first internal pipe (2) for supplying the multiphase fluid rising within said chamber from its lower end comprising or cooperating with a first tubular orifice (5a) passing through a wall portion called bottom wall (1c) of 5 the enclosure, up to its open upper end (2a) opening into the upper part (1-1) of the enclosure, and 2) a second internal gas evacuation pipe (3) extending to within said chamber from its open upper end (3a) preferably disposed higher than said upper opening (2a) of the first pipe, to its lower end comprising or cooperating with a second annular orifice (5b) passing through the bottom wall (1c) of the enclosure coaxially and preferably around said first fluid supply port (5a), and 3) a third annular orifice (5c) passing through said bottom wall of the enclosure coaxially around said first and second annular orifices (5a, 5b).
    [0013]
    13. A method of producing a modular installation according to one of claims 1 to 11, characterized in that the following successive steps are carried out in which: a) one descends a said unitary device suspended on a link (19) from a vessel (24) at the surface (25), and b) preferably, its docking approach is guided with a said connecting piece (6) fixed on said support structure (10), using first guiding elements (8a) integral with said enclosure (1) and said second guide means (10a) integral with said support structure (10), said second guiding elements cooperating with said first guide elements, and c) the said enclosure is connected to a said connection piece, in a disconnectable manner, by means of a fixing flange (7) and coaxial sealing seals (7-1, 7-2 and 7- 3) between said first, second and third tubular orifices (5a, 54b, 5c) passing through the aroi de fonds 36 3016802 (1c) of the enclosure and said first, second and respectively third connection ducts (6a, 6b, 6c) of said connection piece.
    [0014]
    14. Process for separating the two liquid and gaseous phases of a crude oil by means of an installation according to one of claims 1 to 11, characterized in that the following steps are carried out in which 1 ) the crude oil is sent through an inlet pipe (13) to said first central tubular port (5a) of said enclosure via and through said first central conduit (6a) a said part connection (6), at a reduced pressure P1, lower than the static pressure at the bottom of the sea P2, and 2) the crude oil rises within said first internal pipe (2) enclosure, then flows out upper of said first internal flow pipe tangentially to the circular section side wall of the enclosure which causes its separation into a liquid phase and a gaseous phase, and 3) the partially degassed liquid or fluid phase back down to the said third annular orifice (5c ) at the lower end of the chamber, and preferably fills said enclosure to a height level below the upper opening (2a) of said first inner pipe (2), and is recovered, at a level of an external liquid evacuation pipe (16) connected to said second lateral port (6c1) of said connecting piece, and 4) the gas separated from said petroleum is sucked into said second internal pipe towards said second annular orifice (5b) at the lower end of the chamber, and is recovered at an external gas discharge line (15) connected to said first lateral orifice (6b1) of said connection piece. 30
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    同族专利:
    公开号 | 公开日
    EP3099393A1|2016-12-07|
    NO3099393T3|2018-05-19|
    WO2015114247A1|2015-08-06|
    US20160339359A1|2016-11-24|
    US10245530B2|2019-04-02|
    AP2016009334A0|2016-07-31|
    EP3099393B1|2017-12-20|
    JP6345791B2|2018-06-20|
    JP2017507014A|2017-03-16|
    FR3016802B1|2016-02-19|
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    法律状态:
    2015-01-27| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-25| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-22| PLFP| Fee payment|Year of fee payment: 5 |
    2019-01-23| PLFP| Fee payment|Year of fee payment: 6 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 7 |
    2021-10-08| ST| Notification of lapse|Effective date: 20210905 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1400216A|FR3016802B1|2014-01-29|2014-01-29|MODULAR INSTALLATION AND METHOD FOR LIQUID / GAS SEPARATION, PARTICULARLY LIQUID AND GAS PHASES OF A CRUDE OIL.|FR1400216A| FR3016802B1|2014-01-29|2014-01-29|MODULAR INSTALLATION AND METHOD FOR LIQUID / GAS SEPARATION, PARTICULARLY LIQUID AND GAS PHASES OF A CRUDE OIL.|
    PCT/FR2015/050189| WO2015114247A1|2014-01-29|2015-01-28|Modular plant and process for liquid/gas separation, in particular for liquid and gaseous phases of a crude oil|
    JP2016543703A| JP6345791B2|2014-01-29|2015-01-28|Modular plant and process for liquid / gas separation, especially for liquid and gas phase of crude oil|
    EP15706865.1A| EP3099393B1|2014-01-29|2015-01-28|Modular plant and process for liquid/gas separation, in particular for liquid and gaseous phases of a crude oil|
    US15/115,219| US10245530B2|2014-01-29|2015-01-28|Modular plant and process for liquid/gas separation, in particular for liquid and gaseous phases of a crude oil|
    AP2016009334A| AP2016009334A0|2014-01-29|2015-01-28|Modular plant and process for liquid/gas separation, in particular for liquid and gaseous phases of a crude oil|
    NO15706865A| NO3099393T3|2014-01-29|2015-01-28|
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