巴西专利BR112013022928B1 insert to support a seal for a blowout preventer seal assembly, and method for sealing a pipe from a

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专利摘要:
INSERT TO SUPPORT A SEALING ASSEMBLY FROM A BLOWOUT PREVENTOR, AND, METHOD FOR SEALING A PIPE FROM A WELL LOCATION Methods and devices for sealing a well hole are provided. A seal assembly carried by a pair of opposing ram blocks from a blowout preventer is provided. The seal assembly includes a pair of seals carried by the pair of opposing ram blocks and a plurality of inserts carried by the pair of seals. The inserts include an upper body and a lower body with a rib between them. Each of the upper and lower bodies has a tip extended over one end of the seal and a tip receptacle on a front face for receiving the extended tip. The extended tips are positioned in the receptacle of the adjacent insert tip where the extrusion of a seal between them is restricted.
公开号:BR112013022928B1
申请号:R112013022928-4
申请日:2012-02-19
公开日:2020-12-08
发明作者:Sascha Antonio Castriotta；Bradford Shane Franks
申请人:National Oilwell Varco, L.P.；
IPC主号:

专利说明:

BACKGROUND
[001] The present description is generally related to oil field operations. More specifically, the present description relates to techniques for sealing a well site.
[002] Oil field operations are typically performed to locate and collect valuable fluids from the borehole. The oil rigs are positioned at the well locations and the drilling tools below, like drilling tools, are deployed into the ground to reach subsurface reservoirs. Once the bore tools below have constructed a borehole to reach a desired reservoir, the liners can be cemented into place within the borehole, and the borehole completed to start fluid production from the reservoir. Pipes or tubes are typically positioned in the borehole of the well to enable the passage of subsurface fluids to the surface.
[003] The leakage of subsurface fluids poses a significant threat to the environment if they come from the well bore. Equipment, such as blowout preventers (BOPs for blow out preventers), are always positioned around the well bore to form a seal around the tubes and to prevent fluid leakage as it is ported to the surface. BOPs can employ battering rams or battering rams that seal the well bore. Some examples of ram BOPs and / or ram blocks are provided in US Patents / Orders Nos. 4647002, 6173770, 5025708, 7051989, 5575452, 6374925, 20080265188, 5735502, 5897094, 7234530 and 2009/0056132. BOPs can be provided with various devices for sealing various parts of the BOP as described, for example, in US Patents 4508311, 5975484, 6857634 and 6955357. Despite the development of sealing techniques, there remains a need to provide advanced sealing techniques well holes. SUMMARY
[004] The present description relates to techniques for sealing a pipe from a well location. The inserts can be positioned in a seal assembly carried by a pair of opposing ram blocks of a blowout preventer. The inserts have the upper and lower bodies with a rib between them. The upper and lower bodies are provided with the tips extended over one end of the seal and the receptacles of the tips on a front face thereof. The extended tips are receivable in the tip receptacles of an adjacent insert to restrict extrusion between them. The upper and lower bodies can also be provided with recesses and shoulders for the interlock coupling and the sliding movement between the inserts. Curved cutouts can be provided along the ends to conform to the various diameters of the tube.
[005] In another aspect, the description relates to a seal assembly for a blowout preventer. The blowout preventer includes a pair of opposing ram blocks that can be positioned around a pipe at a well location. The seal assembly includes a pair of seals carried by the pair of opposing ram blocks and a plurality of inserts. The inserts carried by the pair of seals and positioned around the tube in an elliptical arrangement. Each of these inserts has an upper body and a lower body with a rib between them. Each of the upper and lower bodies has a tip extended over one end of the seal and a tip receptacle on a front surface thereof. The extended ends of the upper and lower bodies of each of the inserts are receivable in the receptacles of an insert adjacent to the inserts by which the extrusion of the pair of seals between the inserts is restricted.
[006] In yet another aspect, the description relates to a blowout preventer to seal a pipe from a well location. The blowout preventer includes a housing, a pair of opposing ram blocks positioned around a pipe at a well location, and a seal assembly. The sealing assembly includes a pair of seals carried by the pair of opposing ram blocks positioned in a sealing engagement around the pipe and a plurality of inserts. The inserts are carried by the pair of seals and positioned around the tube in an elliptical arrangement. Each of the inserts has an upper body and a lower body with a rib between them. Each of the upper and lower bodies has a tip extended over one end of the seal and a tip receptacle on a front surface. The extended ends of the upper and lower bodies of each of the inserts are receivable in the receptacles of one of the adjacent inserts where the extrusion of the pair of seals between the inserts is restricted.
[007] Finally, in yet another aspect, the description relates to a method for sealing a pipe from a well location. The method involves providing a blowout preventer that includes a housing, a pair of opposing ram blocks positioned around the tube, and a seal assembly. The seal assembly includes a pair of seals carried by the opposing ram blocks and a plurality of inserts carried by the seals. The inserts have an upper body and a lower body with a rib between them. Each of the upper and lower bodies has a tip extended over one end of the seal and a tip receptacle on a front surface thereof. The method also involves placing the seals of the seal assembly around the tube in an elliptical arrangement by advancing the opposite ram blocks towards the tube, and by restricting the extrusion of the pair of seals between the inserts by receiving the extended ends of the bodies upper and lower of each of the inserts in the receptacles at the tip of one of the adjacent inserts. BRIEF DESCRIPTION OF THE DRAWINGS
[008] So that the characteristics and advantages described above of the present description can be understood in detail, a more particular description of the technology contained herein, briefly summarized above, can be obtained with reference to the modalities that are illustrated in the attached drawings. However, it should be noted that the attached drawings illustrate only the typical modalities of this technology and, therefore, are not to be considered as limitations on its scope, since the description may admit other equally effective modalities. Figures are not necessarily to scale, and certain features in certain views of the figures may be displayed exaggeratedly in scale or in schemes in the interests of clarity and conciseness.
[009] Figure 1 is a schematic view of a well site off the coast having a BOP with a seal set according to the description.
[0010] Figure 2 is a schematic view of the BOP in Figure 1 having the ram blocks with the seal assembly.
[0011] Figures 3A and 3B are schematic views of ram blocks with a seal assembly in a retract and seal position, respectively.
[0012] Figures 4A-4C are several schematic views of an insert and a seal assembly.
[0013] Figures 5A and 5B are schematic views of a part of a seal assembly having an interstice and a reduced interstice, respectively.
[0014] Figures 6A-6D are various schematic views of various parts of an assembly having a plurality of inserts according to the description.
[0015] Figures 7A-7D are several schematic views of one of the inserts in Figure 6A.
[0016] Figures 7E-7F are several schematic views of a part of a seal assembly having a plurality of inserts in Figure 7A.
[0017] Figures 8A-8C are schematic views of an alternative insert.
[0018] Figures 9A-9C are schematic views of another alternative insert.
[0019] Figures 10A-10C are several schematic views of a part of a seal assembly having a plurality of inserts in Figure 9A. DETAILED DESCRIPTION
[0020] The following description includes examples of the apparatus, methods, techniques, and instruction sequences that incorporate the techniques of the subject matter. However, it must be understood that the modalities described can be practiced without these specific details.
[0021] The description relates to the techniques for sealing a well hole. The techniques involve the inserts used, for example, in a ram block of a blowout preventer. The inserts can be positioned around a tubular (or tube) to form a seal with it. It may be desirable to provide the techniques that most effectively seal, even under high pressure conditions. It may even be more desirable to provide the techniques that most effectively seal over a variety of pipe diameters. Preferably, such techniques involve one or more of the following, among others: ease of operation, simple design, adaptability to a variety of applications, reduced failures, performance under severe conditions, conformity to the shapes and / or sizes of the equipment, greater capacity, etc. The present description is aimed at meeting these needs of the technique.
[0022] Figure 1 represents a well location off the coast 100 having a blowout preventer (BOP) 108 configured to seal a hole in the well 105 that extends into the seabed 107. The BOP 108 has a set seal 102 positioned thereon. As shown, BOP 108 is part of an underwater system 106 positioned on the seabed 107. The underwater system 106 can also comprise a tube (or tubular) 104 that extends through the hole in well 105, a wellhead 110 around the borehole of the well 105, a conduit 112 extending from the borehole of the well 105, and other subsea devices, such as a separator and a transport and dispensing system (not shown). While the location of well 100 is represented as an underwater operation, it should be appreciated that the location of well 100 can be based on land or water.
[0023] A surface system 120 can be used to facilitate operations at well site 100 offshore. The surface system 120 may comprise equipment 122, a platform 124 (or vessel) and a surface controller 126. Furthermore, there may be one or more subsea controllers 128. While surface controller 126 is shown as a part of the system surface 120 in a surface location and subsea controller 128 is shown as a part of subsea system 106 in a subsea location, it should be understood that one or more of the controllers can be located in multiple locations to control the surface systems and / or submarine.
[0024] To operate BOP 108 and / or other devices associated with well location 100, surface controller 126 and / or subsea controller 128 can be placed in communication. Surface controller 126, subsea controller 128, and / or any devices at well location 100 can communicate via one or more communication links 134. Communication links 134 can be any appropriate communication means, such as coatings hydraulic internals, pneumatic internals, wiring, optical fibers, telemetry, acoustics, wireless communications, any combination thereof, and the like. BOP 108 and / or other devices at well location 100 can be automatically, manually and / or selectively operated via controllers 126 and / or 128.
[0025] Figure 2 shows a detailed schematic view of a BOP 108 that can be used as the BOP 108 of Figure 1. The BOP 108 can be a conventional BOP having a body 236 with a central passage 238 through its interior to receive a tube (for example, 104 in Figure 1). BOP 108 also includes a pair of conventional battering assemblies 240, 242 on opposite sides. Examples of BOPs, ram sets and / or ram blocks used with BOP 108 are described in US Patent No. 5735502. Ram set 240 has been pivoted to reveal ram block 247. Sealing set 102 it is positioned in each of the ram blocks 247 to provide a seal with a tube positioned in the central passage 238.
[0026] Each ram set 240, 242 is in communication with one of the respective radially opposite chambers 244 in the BOP body extending radially outward from the central passage 238. Each ram set 240, 242 may include a ram body. ram 246, ram block 247 and ram port 248. Ram port 238 can be attached to the BOP body by conventional screws (not shown) that pass through the respective holes 250 in ram port 248 and screwed to the corresponding holes 251 in the BOP 236 body.
[0027] Ram sets 240, 242 can be pivoted on the BOP 236 body by pivot arms 252, thus facilitating the repair and maintenance of ram blocks 247. The screws in hole 250 can therefore , be unscrewed from the body of the BOP 236, and the ram set 240 rotated to open, as shown in Figure 2, to expose the ram block 247.
[0028] Ram blocks 247 have an arc-shaped body with an arc-shaped inlet 259 configured to receive a portion of tubing 104 and engage with a seal with it. Once in position, ram block 247 can be selectively activated to move within the sealing assembly 102 to a sealed position around the tube 104 positioned therein.
[0029] Figures 3A-3B show a part of conventional ram block sets 12, 14 in various positions around tube 104. Ram block sets 12, 14 can be used as part of ram blocks 247 of Figure 2. Ram blocks 247 are provided with a seal assembly 102 to support a rubber sleeve (or seal) 249. The seal assembly 102 can be configured to seal over multiple pipe diameters. During activation of ram blocks 247, rubber sleeve 249 is advanced towards drill pipe 104 and forced under hydraulic pressure to conform to drill pipe 104. To protect rubber sleeve 249 (and potentially extend its life), rubber glove 249 can be molded with inserts (or metal reinforcements) 20 that help to retain glove 249 and / or prevent rubber extrusion.
[0030] As shown in Figure 3B, inserts 20 are positionable in an elliptical iris configuration, sometimes referred to as an insert arrangement. The movement of the inserts 20 is similar to that of the iris of an eye that changes the inner diameter of the pupil (or hole) receiving the tube 104. The inserts 20 are slidingly movable between a stowed (or unsealed) position and a sealed position, and interlocked for cooperation movement between them. Inserts 20 are designed to support rubber glove 249 and to perfect a seal formed by rubber glove 249 around tube 104 during operation.
[0031] Conventional inserts 20 are detailed in Figures 4A-4C. These inserts 20 are described in more detail in US Patent No. 6,857,634. Inserts 20 have an upper body 24 and a lower body 26. Each of the upper and lower bodies 24, 26 is provided with a shoulder 30 and a corresponding recess 36 and an anti-extrusion shoulder 46.
[0032] To optimize the operation of the seal assembly 102, the inserts 20 can optionally be provided with geometries that provide support for the seal assembly 102 and / or reduce the extrusion of the rubber sleeve 249 around the tube 104 during operation of the ram blocks 247. Figure 5A shows a part of the arrangement of the inserts 20 of Figure 3B. As shown in Figure 5A, conventional inserts 20 define an inner diameter 560 for receiving tube 104 (Figure 1). Inserts 20 have tips 564 at an end adjacent to the inner diameter 560, and can define the interstices 562 between the inserts 20 along the inner diameter 560. These large interstices provide a space between the inserts and the drill pipe that defines a path to the extrusion or an interstice for the rubber sleeve 249. In some cases, extrusion interstices up to 0.125 inches (0.32 cm) may be present.
[0033] To reduce or restrict the extrusion between the inserts, it may be desirable to reduce the interstices 562. These reduced interstices can reduce the open area (or space) between the tube 104 and the inserts 20 to restrict the extrusion through them. As shown in Figure 5B, alternative inserts 20a are provided with extended tips 564a that extend beyond a secondary tip 565a over an end of the insert seal 20a. The extended tips 564a can be used to provide a reduced interstice 562a between them along the inner diameter 560a. The geometry of the inserts 20a can be used to minimize the extrusion gap 562a by providing geometries that incrementally match the various tube sizes. The shape, size and quantity of the geometries can vary based on a desired coverage range and / or operating conditions.
[0034] Inserts can be supplied with various characteristics, such as in curved cutouts (in facets) as will be described here, to reduce this interstice to, for example, about 0.015 - 0.030 inches (0.38 - 0.76 mm) or less. In addition, the inserts may also have overlapping characteristics, such as the tips, shoulders or shoulders as will be described here further, to allow for a greater surface area to distribute the characteristics. Such overlapping characteristics can be used over parts of the inserts to support an insert adjacent to the internal pressures of the rubber, which prevents extrusion between the inserts, and / or add rigidity to the seal assembly.
[0035] Figures 6A-6D show several views of an insert 20a used in the seal assembly 102 of Figures 1-3B. Figure 6A shows an elliptical arrangement of the inserts 20a forming a part of an alternative seal assembly 102a and defining a variable internal diameter 560a. Figure 6B shows a part of the arrangement of the inserts 20a of Figure 6A taken along line 6B-6B. Figure 6C is a detailed view of part 6C of assembly 102a of Figure 6A. Figure 6D is a detailed view of two inserts 20a together interlocked for sliding movement between them.
[0036] As shown in Figures 6C-6D, inserts 20a can be provided with extended ends 564a (or sharp) that end at a point to fill interstice 562a (see, for example, Figure 5B). The extended tip 564a may, for example, have a radius R of about 0.03 - 0.05 inches (0.76 - 1.27 mm) near one end. A tip receptacle 667a can be provided in insert 20a to receive the extended tip 564a from an adjacent insert 20a, and to provide an overlap between inserts 20a, as will be described below.
[0037] The elliptical arrangement of the inserts defines an internal contact surface to engage the tube. The inserts 20a can be provided with curved cutouts (or contact surfaces) 566a to engage the tube 104 and still fill the interstices 562a around the inner diameter 560a. One or more of the curved cutouts 566a can be provided along the extended tip to define the contact surface for receiving the tube 104. Multiple curved cutouts can be provided with a curved contact surface that can conform to the shape of a variety of tube diameters. The inserts can contract and expand around the tube to conform to the size and shape of the tube, and the shape of the curved indentations can conform to the various tubes.
[0038] Figures 7A-7D show the inserts 20a in greater detail. Inserts 20a cooperate with each other to radially expand and contract in an iris pattern (see, for example, Figures 3B, and 6B). Each insert 20a has an upper body 768a and a lower body 770a with a rib 772a between them made entirely of metal. The upper body has the same shape as the lower body and is a mirror image of it. The rib 772a is substantially smaller than the upper body 768a and the lower body 770a to allow the rubber sleeve 249 to flow between the metal inserts 20a as the ram blocks 247 are pressed together as shown in Figure 3B.
[0039] Each of the upper body 768a and the lower body 770a, has a front face 774a as shown in Figure 7A and a rear face 776a as shown in Figure 7B. The front face 774a and the rear face 776a are at the extended end 564a at one end in addition to the secondary end 565a, and are connected by a knee (or radially opposite face) 778a at an opposite end. Each of the upper body 768a and the lower body 770a has an inverted shoulder 782a extending from the front face 774a, and an inverted recess 784a notched inside the rear face 776a as shown in figure 7C. The inverted recess 784a is configured to receive the inverted shoulder 782a from an adjacent insert as shown in Figure 6D for a sliding support with each other. The inverted recess 784a and the inverted recess 782a can be matched to interact cooperatively in a similar manner to the recess 30 and recess 36 of Figure 4a. The bosses 782a and the bosses 784a can be inverted from the configuration of boss 30 and boss 36 positioned on an external surface of insert 20 of Figure 4A. In the inverted configuration, the shoulders 782a and recesses 784a are positioned on an internal surface of the upper and lower bodies 768a, 770a to further support the inserts 20a as the pressure is applied during a sealing operation.
[0040] The front face 774a has a plurality of curved cutouts (or contact surfaces or faces) 566a over a part as shown in Figure 7A. One or more curved cutouts 566a can be provided. As shown, four curved cutouts 566a extend to the front face 774a. The curved indentations 566a can be concave indentations configured to receptively engage tube 104. To further reduce the interstice 562a (Figure 5B), the curved indentations 566a of adjacent inserts 20a are preferably shaped to conform to the shape of the diameter internal 560a (Figure 4B). The curved cutouts 566a can also be of a shape such that, as the inner diameter 560a defined by the inserts fits for a given tube size, the curved cutouts 566a conform to the shape of the tube. Additional curved cutouts 566a can be added to provide conformity for the other pipe sizes. In some cases, curved cutouts 566a may define an edge 787a between them. Edges 787a can optionally be smooth or curved to provide a smooth transition between curved cutouts 566a.
[0041] Figure 7D shows a part of the insert 20a that represents the extended tip 564a in greater detail. Figures 7E and 7F show views of part of an insert configuration 20a. Insert 20a has a tip receptacle 667a that extends to the upper body 768a to receive the extended tip 564a of an adjacent insert 20a. This superimposed configuration can be used to position the inserts more tightly together, and further shape the extended tip 564a with the shape of the tube. In addition, this superimposed configuration can be used to further prevent extrusion between the inserts.
[0042] Figures 8A-8B show an alternative insert 20b that is similar to insert 20a, except that each of the upper body 768b and the lower body 770b has a recess 888b that extends to the front face 774b with the corresponding shoulders 890b extending to the rear face 776b. The upper body 768b and the lower body 770b have a rib between them. In this configuration, the recesses 888b and the recesses 890b are vertical (not inverted as shown in insert 20a of Figures 7A-7F), and are positioned on an external surface of the insert 20b. The recess 888b and the recess 890b can interact cooperatively in a similar manner to the recess 30 and recess 36 of Figure 4A. One or more recesses 888b and the corresponding recesses 890b can be provided over various parts of the upper and / or lower body 786b, 770b of each insert 20b.
[0043] As shown in Figures 8A and 8B, a shoulder (or an anti-extrusion shoulder directed radially inward) 892b extends from the front face 774b and a corresponding crest 894b extends into the rear face776b in the upper body 786b in each insert 20a. Shoulder 892b and crest 894b can operate similarly to the anti-extrusion shoulder directed radially inward 46 of insert 20 in Figure 4A.
[0044] The shoulder 892b and the ridge 894b define a first line of interaction between the inserts 20b. The shoulder 890b extends from the rear face 776b to define a second line of interaction with the shoulder 888b. This two-line configuration can be used to support cooperative movement and support inserts 20b, and to prevent extrusion between them. One or more shoulders 892b and the corresponding ridges 894b can also be provided over various parts of insert 20b to support and / or prevent extrusion between adjacent inserts. Curved cutouts 566b adjacent to extended ends 564b, similarly to curved cutouts 566a of Figures 7A-7C, can also be provided to reduce the interstice between inserts 20b and further prevent extrusion between them. The extended tip 564b is provided with a secondary tip 565b below it.
[0045] Figures 9A-9B show an alternative insert 20c which is similar to insert 20b, except that each of the upper body 768c and the lower body 770c have multiple recesses 888c extending to the front face 774c with corresponding vertical shoulders 890c extending to the rear face 776c. The upper body 768c and the lower body 770c have a rib 772c between them. Multiple recesses 888c and multiple recesses 890c can interact cooperatively in a similar manner to recesses 890b and recesses 888b in Figures 8A-8B. In this case, the multiple recesses 888c and the corresponding recesses 890c are provided with various depths to provide additional contact between adjacent inserts. The 890c bosses and additional 888c bosses can be used to increase the degree of overlap between the inserts and / or to reduce the extrusion between them. One or more recesses 888c and the corresponding recesses 890c for receiving that shoulder can also be provided around various parts of the upper and / or lower body of each insert 20c.
[0046] As shown in Figures 9a and 9B, insert 20c can also be provided with a shoulder (or an ANTI-EXTRUSION shoulder directed radially inward) 892c extending from the front face 774c and a corresponding ridge 894c extending to the interior of the rear face 776c in the upper body 786c in each insert 20c. Shoulder 892c and crest 894c can operate similarly to shoulder 892b and crest 894b of Figures 8A and 8B.
[0047] The recesses 888c and shoulders 890c define a first and a second line of interaction between the inserts 20c. Shoulder 892c extends from front face 774c to define a third line of interaction between inserts 20c. This three-line configuration can be used to support cooperative movement and support inserts 20c, and to prevent extrusion between them. One or more shoulders 892c and corresponding ridges 894c can also be provided around various parts of insert 20c to support and / or prevent extrusion between adjacent inserts. The curved cutouts 566c positioned around the extended tip 564c, similarly to the curved cutouts 566a of Figures 7A-7C, can also be provided to reduce the interstices between the inserts 20c and still prevent extrusion between them. Two extended tips 564c are provided with a secondary tip 565c underneath.
[0048] Figures 10A-10C show views of part of an insert arrangement 20c. Each insert 20c has a tip receptacle 667c that extends into the upper body 768c and the lower body 770c to receive the extended tip 564c from an adjacent insert 20c as shown in Figures 10A and 10B. This superimposed configuration can be used to more closely position the inserts 20c together, and further mold the extended ends 564c to the shape of the tube. Figure 10C also shows the shoulders 890c and shoulder 892c of a first insert 20c being received by the recesses 888c and the ridge 894c, respectively from an adjacent insert 20c for greater overlap between them. These overlapping configurations can also be used to further prevent extrusion between inserts.
[0049] In an example of the operation, the ram blocks can be actuated between the retracted position of Figure 4A and the sealed position of Figure 4B. The inserts 20a-c of the seal assembly 102a-c can move slidingly to cooperatively conform to the shape of the tube 104 and to engage with the seal therewith. Inserts 20a-c can be provided with various combinations of features, such as recesses, shoulders, ridges, curved cutouts, receptacles and extended ends to improve the operation of the seal assembly.
[0050] It should be appreciated by those more versed in the technique that the techniques disclosed here can be implemented in automatic / autonomous applications via a computer program configured with algorithms to perform the desired functions. These aspects can be implemented by programming one or more general-purpose computers containing the appropriate equipment. Programming can be achieved through the use of one or more program storage devices readable by the processor (s) and encoding one or more instruction programs executable by the computer to perform the operations described here. The program storage device may take the form of, for example, one or more floppy disks, a read-only hard disk (CD ROM, for computer disk read only memory) or another optical disk; a read-only memory circuit (ROM, for read only memory); or other forms of the type well known in the art or to be subsequently developed. The program instructions can be “objective code”; that is, in binary form that is executed more or less directly by the computer; or in “source code” which requires compilation or interpretation before execution; or in some intermediate form such as partially compiled code. The precise forms of the program storage device and the instructions encoding are immaterial. The aspects of the description can also be configured to perform the functions described (via appropriate hardware / software) only on site and / or remotely controlled via an extensive communications network (for example, wireless, internet, satellite, etc.).
[0051] While the present description describes specific aspects of the description, several modifications and variations will become noticeable by those more versed in the technique after examining the description, including the use of functional equivalents and / or structural substitutes for the elements described here. For example, aspects of the description can also be implemented using various combinations of one or more of the recesses, shoulders, ridges, curved indentations, receptacles, extended ends and / or other features on the various parts of the inserts. All such variations perceptible by those more skilled in the art are recognized as being within the scope of the description as defined by the appended claims.
[0052] Multiple plural examples can be provided for the components, operations or structures described here as in a single example. In general, the structures and features presented as separate components in the example configurations can be deployed as a combined structure or component. Similarly, the structures and features presented as a single component can be deployed as separate components. These and other variations, modifications, additions, and improvements may fall within the scope of the subject matter.

权利要求:
Claims (13)
[0001]
1. Insert (20) to support a seal (249) of a seal assembly (102a) of a blowout preventer (108), the seal assembly being positionable in a sealing engagement with a tube (104), and the insert comprising: an upper body (768a) and a lower body (770a) with a rib (772a) between them, characterized by the fact that each of the upper and lower bodies has an extended point (564a) on one end of the seal same and a tip receptacle (667a, c) on a front face (774b) thereof; wherein the extended ends of the upper and lower bodies of the insert are receivable in the tip receptacles of an adjacent insert whereby the extrusion of the seal between them is restricted.
[0002]
2. Insert according to claim 1, characterized in that each of the upper and lower bodies has a plurality of curved cutouts (566a, b) adjacent to the extended ends.
[0003]
Insert according to any one of claims 1 to 2, characterized in that each of the upper and lower bodies has at least one shoulder (890b, c) and at least one recess (888b, c) to receive at least a shoulder of an adjacent insert.
[0004]
4. Insert according to claim 3, characterized in that at least one shoulder comprises an inverted shoulder (782a), a vertical shoulder (890b) or an anti-extrusion recess (892c).
[0005]
Insert according to any one of claims 3 to 4, characterized in that at least one recess comprises an inverted recess (784a), a vertical recess (888b, c), or an anti-extrusion ridge (894c)
[0006]
Insert according to any one of claims 1 to 5, characterized in that the upper body additionally comprises a secondary tip (565a, b, c) at a distance from the end of the seal.
[0007]
7. Insert according to any one of claims 1 to 6, characterized in that a plurality of inserts are positioned in the blowout preventer seal assembly, the blowout preventer comprising a housing, a pair of opposing ram blocks ( 247) capable of being positioned around the pipe of a pit location (100), the seal assembly additionally comprising a pair of seals (249) carried by the pair of opposing ram blocks, the plurality of inserts carried by the pair of seals and positionable around the tubing in an elliptical arrangement.
[0008]
8. Insert according to claim 7, characterized in that the internal diameter (560a) of the elliptical arrangement is variable.
[0009]
9. Insert according to claim 7, characterized in that the plurality of inserts are interlocked.
[0010]
10. Insert according to any one of claims 7 to 9, characterized in that when the plurality of inserts are positioned in a sealing engagement with the tube, an extrusion interstice (562a) is defined between the plurality of inserts and the tube receives the pair of seals in a mobile way.
[0011]
11. Insert according to any one of claims 7 to 10, characterized in that each of the plurality of inserts has at least one curved cutout (566a, b) around the extended end such that, when positioned in the elliptical arrangement around the tube, the at least curved indentation of the extended end of the plurality of inserts defines an internal surface for receptively engaging the tube.
[0012]
12. Method for sealing a pipe (104) from a pit location (100), characterized in that the method comprises: providing a blowout preventer (108) comprising a housing, a pair of opposing ram blocks (247) positioned around the tube with a seal assembly (102a), the seal assembly comprising: a pair of seals (249) carried by the pair of opposing ram blocks; and a plurality of inserts (20a) carried by the pair of seals, each of the plurality of inserts having an upper body (768a) and a lower body (770a) with a rib (772a) between them, and each of the upper bodies and lower ones having an extended tip (564a) on a sealing end, and a tip receptacle (667a) on a front face (774b) thereof; positioning the plurality of inserts of the sealing assembly around the tube in an elliptical arrangement by advancing the opposite ram blocks in the direction of the tube; and restricting the extrusion of the pair of seals between the plurality of inserts by receiving the extended ends of the upper and lower bodies of each of the plurality of inserts in the tip receptacles of an adjacent insert of the plurality of inserts.
[0013]
13. Method according to claim 12, characterized in that it additionally comprises receiving tubes of various diameters in an adjustable manner.

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同族专利:

公开号 | 公开日

EP2683912B1|2017-08-23|

CA2828956C|2016-08-02|

BR112013022928A2|2016-12-06|

SG193346A1|2013-10-30|

CN103502565A|2014-01-08|

US20120227987A1|2012-09-13|

CN103502565B|2016-03-09|

WO2012121866A2|2012-09-13|

KR20150092371A|2015-08-12|

US8978751B2|2015-03-17|

KR101697397B1|2017-01-17|

WO2012121866A3|2013-08-15|

KR20130129275A|2013-11-27|

CA2828956A1|2012-09-13|

EP2683912A2|2014-01-15|

NO2683912T3|2018-01-20|

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法律状态:
2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

2020-09-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

2020-12-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 19/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

US201161450965P| true| 2011-03-09|2011-03-09|

US61/450,965|2011-03-09|

PCT/US2012/025767|WO2012121866A2|2011-03-09|2012-02-19|Method and apparatus for sealing a wellbore|

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