• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    subsea drilling, production or processing drive system a subsea drilling, production and processing drive system comprising a variable speed electric motor (10) adapted to be powered with a current; reversible hydraulic pump (8, 28) driven by the engine; a hydraulic piston assembly (92, 101, 111, 121, 131) connected to the pump and comprising a first chamber (2), a second chamber (3) and a piston (4) separating the first and second chamber and configured to actuate a valve (91) in a subsea system; a fluid reservoir (14) connected with the pump and hydraulic piston assembly; the pump, hydraulic piston assembly and reservoir connected in a substantially closed hydraulic system; and a pressure compensator (13, 65) configured to normalize pressure differences between the outside of the hydraulic system and the inside of the hydraulic system.
    公开号:BR112013022783B1
    申请号:R112013022783-4
    申请日:2012-03-06
    公开日:2021-06-29
    发明作者:David Geiger；Raymond S. Scheffler
    申请人:Moog Inc；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [01] The present invention concerns the field of subsea equipment for drilling, processing and production in general, and more specifically to an improved subsea system for this equipment. FUNDAMENTALS OF THE TECHNIQUE
    [02] In subsea oil and gas exploration, the drilling system or wellhead can be located many thousands of feet below the sea surface. In this way, specialized equipment is used to drill, produce and process oil and gas on the seabed, such as underwater Christmas trees, processing systems, separators, systems with high protection of the integrity of pipes, probes, distribution tubes , interconnection and production systems and distribution systems. This equipment is normally controlled by a number of types of valves, including safety shutters to prevent an unwanted discharge of hydrocarbons into the sea.
    [03] With existing systems, typically, these valves are hydraulically operated providing a pressurized hydraulic fluid from the vessel on the surface down to the wellhead. Large pipelines of hydraulic power from ships or rigs on the ocean surface feed drilling, production and processing equipment on the ocean floor, and the many systems that have valves and actuators. However, installing and maintaining these pipelines is expensive and in some cases may not be feasible, for example, at depths greater than 10,000 feet (3048 meters) or under ice caps in the arctic circle.
    [04] Thus, it is desirable to provide an actuator that does not need this umbilical connection from the surface and that is still capable of operating with the desired power and functionality. BRIEF SUMMARY OF THE INVENTION
    [05] With slight reference to the corresponding parts, portions or surfaces of the disclosed embodiment, for illustrative purposes only and not by way of limitation, the present invention provides a subsea drive system for drilling, production and processing, comprising a motor variable speed electric (10) adapted to be powered with a current; a reversible hydraulic pump (2, 28) driven by the engine, a hydraulic piston assembly (92, 101, 111, 121, 131) connected with the pump and comprising a first chamber (2), a second chamber (3) and a piston (4) separating the first and second chambers and configured to actuate a valve (91) in a subsea system, a fluid reservoir (14) connected with the pump and with the hydraulic piston assembly; the pump, hydraulic piston assembly and reservoir being connected in a substantially closed hydraulic system; and a pressure compensator (13, 65) configured to normalize pressure differences between the outside of the hydraulic system and the inside of the hydraulic system.
    [06] The submarine system may also comprise a safety mechanism (98). The safety mechanism may comprise a spring element (36) biasing the piston in a first direction. The safety mechanism may comprise a failsafe valve (35) between the first chamber and the second chamber or between the second chamber and the reservoir and the failsafe valve may be arranged to open in case of power failure allowing the equalization of fluid pressure in the first and second chambers on each side of the piston. The safety mechanism can comprise a two-stage trigger.
    [07] The subsea system may also comprise a filter between the pump and the hydraulic piston assembly.
    [08] The electric motor can comprise a DC motor without brush, or it can be selected from a group consisting of a stepper motor, a brush motor or an induction motor. The hydraulic pump can be selected from a group consisting of a fixed displacement pump, a variable displacement pump, a two port pump and a three port pump. The pump may comprise a two-port pump (8) or a three-port pump (28). The piston may comprise a first surface area exposed to the first chamber and a second surface area exposed to a second chamber. The first surface area (4c) can be substantially equal to the second surface area (4b). The first surface area (4a) may be substantially different from the second surface area (4b).
    [09] The hydraulic piston assembly may comprise a cylinder (1) having a first outer wall (1b) with the piston disposed in a cylinder for the sealing sliding movement along it, and a first actuator rod (5) connected with the piston for movement therewith and having a sealing portion penetrating the first outer wall. The cylinder may have a second outer wall (1a) and the hydraulic piston assembly may comprise a second actuator rod (5a) connected with the piston for movement therewith and having a sealing portion penetrating the second outer wall.
    [10] The valve may comprise a check valve on a safety shutter, and the check valve may comprise a shutoff valve. The valve may comprise a control valve in a subsea production and processing system.
    [11] The pressure compensator may comprise a membrane (15) in a fluid reservoir (13). The pressure compensator may comprise a piston (67 in a cylindrical housing 66).
    [12] The valve may be from an assembly selected from a group consisting of a subsea safety shutter, a subsea production Christmas tree or a wellhead system, or a subsea processing and separation system, a subsea system a subsea prop, a subsea flotation module, or a subsea distribution system. The subsea system may further comprise operably arranged shut-off valves to selectively isolate the pump from the first and second chambers. The subsea system may further comprise a position sensor (40) configured to sense the position of the piston. The subsea system may further comprise a pressure sensor (41, 42) configured to sense pressure in the first and second chambers. BRIEF DESCRIPTION OF THE DRAWINGS
    [13] FIG. 1 is a view of a safety-embodiment component of the subsea drive system operating a valve in the subsea oil processing pipeline.
    [14] FIG. 2 is a detailed schematic view of a first embodiment of the subsea drive system shown in FIG. 1, this view showing an uneven piston area shaped against cavitation.
    [15] FIG. 3 is a detailed schematic view of a second embodiment of the subsea drive system shown in FIG. 1, this view showing a form of safety spring.
    [16] FIG. 4 is a detailed schematic view of a third embodiment of the subsea drive system shown in FIG. 1, this view showing an equal piston area and a double rod shape.
    [17] FIG. 5 is a detailed schematic view of a fourth embodiment of the subsea drive system shown in FIG. 1, this view showing a form of three-port pump.
    [18] FIG. 6 is a cross-sectional view of the piston assembly shown in FIG.
    [19] FIG. 7 is a cross-sectional view of the bidirectional pump shown in FIG. two.
    [20] FIG. 8 is a cross-sectional view of a variable speed servo electric motor shown in FIG.
    [21] FIG. 9 is a cross-sectional view of a reservoir and a buffer shown in FIG.
    [22] FIG. 10 is a cross-sectional view of an alternate embodiment of the reservoir and buffer shown in FIG. 9. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
    [23] It should be clearly understood at the outset that like reference numbers serve to identify like structural elements, portions, or surfaces consistently across the various figures of the drawings, as these elements, portions, and surfaces can be described or explained later. in the report as a whole, of which this detailed description is an integral part. Unless otherwise indicated, drawings are intended to be examined (eg, shading, arrangement of parts, proportion, grade, etc.) together with the report, and should be considered as a portion of the description. general writing of this invention. As used in the following description, the terms "horizontal", "vertical", "left", "right", "above" and "below", as well as the adjective and adverbial derivatives thereof (for example, "horizontally", "one way to the right", "one way upwards", etc.) simply refer to the orientation of the illustrated structure as the figure of the specific drawing is facing the reader. Likewise the terms "mode in" and "mode out" generally refer to the orientation of a surface with respect to its axis of elongation, or axis of rotation, as the case may be.
    [24] With regard to the drawings now, and more specifically to FIG. 1 thereof, the present invention broadly provides a subsea actuation system for a subsea valve, one embodiment of which is indicated by 90. As shown in FIG. 1, the assembly 90 is adapted to actuate a subsea valve of process 91 or another type of valve or similar component in a subsea environment. FIG. 1 shows the control valve architecture with a pressure compensated vessel that protects the spring assembly. In this embodiment, a subsea fluid, such as oil or gas, is metered by process valve 91 and the forces required by metering valve 91 are created by subsea actuation system 90 which includes an actuator piston assembly 92; an integrated bidirectional pump 8; a 10 variable speed bidirectional electric servo motor; an electronic engine controller 95; fluid logic elements/check valves 96; a reservoir/compensator 13 and a safety spring assembly 98. The safety spring assembly 98, depending on the design requirements, will actuate the process valve 91 in a closed fault condition or an open fault condition when power is applied. is lost. Engine controller 95 includes drive electronics to switch engine 10 and to receive feedback from sensors in the system and control engine 10 accordingly.
    [25] FIG. 2 shows an embodiment 100 of a subsea drive system. As indicated, system 100 includes a variable speed electric motor 10, a bidirectional or reversible pump 8 driven by motor 10, a hydraulic piston assembly 101, a pressure compensated reservoir 13, with a system fluid tank 14, transducers of pressure 41 and 42 that feed back the engine 10; a controller 95, and a position transducer 40 which feeds back the motor controller 95. The pump 8, piston assembly 101 and tank 14 are connected by a plurality of hydraulic flow ducts 6, 7, 12, 17, 19 and 20 to form a closed fluid system.
    [26] As shown in more detail in FIG. 8, in this embodiment the motor 10 is a variable speed brushless DC servo motor that is supplied with a current. Motor 10 has an internal motor 5 with permanent magnets and a fixed non-rotating stator 51 with spiral windings. When a current is properly applied through the stator coils 51, a magnetic field is induced. The interaction of the magnetic field between the stator 51 and the rotor 50 generates a torque that can rotate the drive shaft 52. There are no mechanical brushes that switch the stator fields in this embodiment of the motor. Drive electronics, based on the angular position feedback of the rotary transformer 53, generate and switch the stator fields to modify the speed and direction of motor 10. In this way, motor 10 will selectively apply torque on shaft 52 at one direction around the xx axis at variable speeds and will torque axis 52 in the opposite direction around the xx axis at variable speeds. Other engines can be used as alternatives. For example, a variable speed stepper motor, a brush motor or an induction motor can be used.
    [27] As shown in additional detail in FIG. 7, in this embodiment, pump 8 is a fixed bidirectional displacement pump and two-port internal mechanism. The pumping elements, namely gears 55 and 56, are capable of rotating in any direction, thus allowing hydraulic fluid to run in either direction 47 or 48. This allows oil to be drawn into and out of the system. when the system controller closes the position or pressure control loop. Gear shaft 55 is connected with drive shaft 52 of motor 10, with the other pump gear 56 in sequence. Fluid is directed to run out of gears 55 and 56, between gear teeth of gears 55 and 56 and housing 57, respectively. In this way, rotation of gear 55 clockwise 46 causes fluid to flow in a direction 48 from port 8a or port 8b. Rotating gear 55 counterclockwise 45 causes fluid to flow in the opposite direction 47 to port 8b out of port 8a. In this way, the direction of flow of pump 8 depends on the direction of rotation of rotor 50 and drive shaft 52 around axis x-x. Furthermore, the speed and flow of pump 8 vary with variations in the speed of motor 10. Other bidirectional pumps can be used as alternatives. For example, a variable displacement pump can be used.
    [28] As shown in more detail in FIG. 9, in this embodiment, reservoir 13 includes a bladder-type pressure compensator for the fluid system. As shown, reservoir 13 is separated into two variable volume chambers 14 and 16 and by an elastomeric bladder, or diaphragm 15. Chamber 16 is open to seawater through port 60, and chamber 14 operates as a reservoir. hydraulic, through port 61, stops system fluid and is sealed and pressure balanced from the external environment 16 by bladder 15. When system fluid is displaced, bladder 15 will move and displace the water in chamber 16 in the other side. Bladder 15 is easily displaceable and ensures that the fluid inside is substantially equal to the ambient pressure of the water outside the system.
    [29] FIG. 10 shows a pressure compensator with an alternative piston type for reservoir 14. As shown, it works in general the same way as the bladder type, except that the barrier between the system fluid in chamber 14 and the water in the chamber 16 is piston 67, which is slidably disposed within cylinder housing 66. When system fluid is displaced, piston 67 will move and displace water in chamber 16 on the other side. The piston 67 moves in the housing 66 to ensure that the fluid inside is substantially equal to the ambient pressure of the water outside the system.
    [30] As shown in FIG. 2 and in FIG. 6, piston assembly 101 includes a piston 4 slidably disposed within cylinder housing 1. Motor 10, pump 8, valves and ducts, and compensator 13 are typically integrated into housing 1. is mounted on piston 4 to move with piston 4 and extends to the right and selectively penetrates right outer wall 1b of housing 1. Piston 4 is slidably disposed within cylinder 1, and sealingly separates the left chamber. 2 of the right chamber 3. In this embodiment, almost all of the circular vertical outer surfaces facing the left side 4a of the piston 4 are facing the inside of the left chamber 2. However, only the right facing annular vertical outer surface 4b of the piston 4 is facing in the right direction into right chamber 3, due to the addition of rod 5, through chamber 3 and out of housing 1. This creates an uneven piston area configuration, being the surface area. cie of face 4a greater than the surface area of face 4b.
    [31] As shown in FIG.2, one side or port 8a of pump 8 communicates with left chamber 2 via a fluid duct 6, and opposite side or port 8b of pump 8 communicates with right chamber 3 , via fluid duct 7. One side 8a of pump 8 communicates with tank 14 via fluid duct 12 and the opposite side 8b of pump 8 communicates with tank 14 via fluid duct 17. Chamber 3 communicates with tank 13 through ducts 7 and 17 and chamber 2 communicates with tank 13 through ducts 6 and 12.
    [32] Piston 4 will extend or shift to the right when bidirectional motor 10 is rotated in a first direction, thereby rotating bidirectional pump 8 (namely driven gear 55) in the first direction 16 and drawing fluid through the port 8b of duct 7 and chamber 3. A pilot operated check valve 11 is opened by the pressure built up in duct 20 due to the flow of pump 8 into duct 6, which allows for additional fluid extraction from duct 12 and the reservoir 14. Bidirectional pump 8 also leaks fluid through port 8a into duct 6, closing check valve 9 and thereby isolating duct 6 from reservoir 14. Fluid in duct 6 flows into chamber 2 of the assembly. 101, thereby creating a pressure differential over piston 4 and causing it to extend rod 5 to the right.
    [33] Piston 4 retracts rod 5 or shifts to the left when bidirectional motor 10 is rotated in the other direction, thereby rotating bidirectional pump 8 in direction 45 and drawing fluid through port 8a of duct 6 and chamber 2 A pilot operated check valve 9 is opened by pressure built up in duct 19 due to the flow of pump 8 into duct 7, which allows additional fluid from duct 6 to flow into the compensated pressure reservoir of system 14. bidirectional pump 8 also leaks fluid from port 8b into duct 7, closing check valve 11 and thereby isolating duct 7 from reservoir 14. Fluid in duct 7 flows into chamber 3 of assembly 101, thus creating a pressure differential on piston 4 and causing it to retract rod 5.
    [34] The function of this configuration against cavitation is to take care of the volumetric differences between opposite chambers 2 and 3. For example, when piston 4 moves in the left direction inside cylinder 1, the volume of fluid removed from the left chamber collapses 2 will be greater than the volume of fluid provided to the expanding right chamber 3.
    [35] Controller 95 controls the current to motor 10 at the proper magnitude and direction. The position of rod 5 is monitored by means of a transducer 40 and the position signals are then fed back to the motor controller 95. Additionally or alternatively, the pressure in ducts 6 and 7 to chambers 2 and 3 is monitored with pressure transducers 41 and 42, respectively; and the pressure signals are fed back to the motor controller 95. The bidirectional variable speed motor 10 and a pump 8 control the speed and power of piston 4, and in turn rod 5, modifying flow and flow. pressure acting on the piston. This is accomplished by examining the feedback from position transducer 40 and/or pressure transducers 41 and 42 and then closing the control loop by adjusting motor 10 speed and direction accordingly. Although position sensor 40 is shown as a magnetostrictive linear position sensor, other position sensors can be used. For example, an LVDT position sensor can be used as an alternative.
    [36] Another embodiment110 is shown in FIG.3. This embodiment includes a security mechanism shown in FIG. 1, for when it becomes necessary to close valve 91, such as in an emergency situation. In this embodiment, springs 36 are provided to bias the rod 5 towards the extended position. One side or port 8a of pump 8 communicates with left chamber 2 through a fluid duct 6, and the opposite side or port 8b of pump 8 communicates with right chamber 3 through a fluid duct 7. One side 8a of pump 8 communicates with tank 14 through a fluid duct 22 and the opposite side 8b of pump 8 does not include a fluid duct to tank 14. A by-pass fluid pipe 21 connects ducts 6 and 7, and thus chambers 1 and 3, and a solenoid operated valve 35 is provided in duct 21. Pump 8, piston assembly 111 and tank 14 are connected by a plurality of ducts. hydraulic fluid 6, 7, 21 and 22 to form a closed fluid system. When in regular operation, valve 35 is energized so that the state of valve 35 is port-locked, thereby blocking the flow between chambers 2 and 3 through duct 21. However, the solenoid valve is bypassed by a spring to move valve 35 to an open position.
    [37] Piston 4 will move to extend rod 5 when bidirectional motor 10 is rotated in a first direction, thereby rotating bidirectional pump 8 in a first direction 25 and drawing fluid through port 8b of duct 7 and of chamber 3. Bidirectional pump 8 also leaks fluid into duct 6 and tank 14. Since chamber 2 is always connected with tank 14, springs 36 force piston 4 to the right to extend the rod. 5.
    [38] Piston 4 will move to the left to retract rod 5 when bidirectional motor 10 is rotated in the other direction, thereby rotating bidirectional pump 8 in the other direction 46 and drawing fluid through port 8a of duct 6. Bidirectional pump 8 also leaks fluid into a duct 7 and chamber 3. Since chamber 2 is always connected with reservoir 14, the differential force of the piston between the pressure of chamber 3 and the springs 36 causes allow the piston to move to the left and retract the rod 5.
    [39] Again, the bidirectional variable speed motor 10 and pump 8 control the speed and force of piston 4m by changing the flow and applying pressure on piston 4 using feedback from the 40 position transducer and/or pressure transducers 41 and 42 and then closing the control loop, adjusting the motor speed and direction accordingly.
    [40] When valve 35 is de-energized, such as in a power loss emergency, the spring of solenoid valve 35 will return it to an open position. In this state, chamber 3 is connected through duct 21 with chamber 2 and with reservoir 14, thereby equalizing the pressure in chambers 2 and 3. Since the fluid pressure is then equalized on each side of piston 4 , springs 36 will extend stem 5 and valve 91 will close when fluid is transferred from chamber 3. In this way, regardless of the flow rate of pump 8, springs 36 will extend stem 5 and close valve 91. system can be similarly arranged to provide security in the retracted position of the piston.
    [41] Another embodiment 120 is shown in FIG. 4. This embodiment is similar to the embodiment shown in FIG. 2 but with double rod and an equal area of piston assembly 121. As shown, piston 4 includes opposing rods 5a and 5b mounted on piston 4 for displacement with the piston 4. The rod 5b extends to the right and penetrates the right outer wall 1b of the housing 1. The rod 5a extends to the left and penetrates the left outer wall 1a of the housing 1. In this embodiment, the surface left-facing annular vertical outer surface 4c of piston 4 faces into left chamber 2, due to the addition of rod 5a through chamber 2, and right-facing annular vertical outer surface 4b of piston 4 faces inside of straight chamber 3 because rod 5b extends through chamber 3 and outer housing 1. With rods 5a and 5b of equal diameter, this creates an equal piston area configuration, the surface area of face 4c being substantially a same as the surface area of face 4b. Pump 8, piston assembly 121 and tank 14 are connected by a plurality of hydraulic flow ducts 6, 7, 12 and 17 to form a closed fluid system.
    [42] Piston 4 will move to the right to extend rod 5b and retract rod 5a when motor 10 is rotated in a first direction, thereby rotating bidirectional pump 8 in first direction 45 and drawing fluid through port 8b from duct 7 and chamber 3. Pump 8 also leaks fluid into duct 6 and chamber 2, creating a pressure differential over piston 4 and causing it to extend rod 5b and retract rod 5a .
    [43] Piston 4 will move to the left to retract rod 5b and extend rod 5a when bidirectional motor 10 is rotated in the other direction, thereby rotating bidirectional pump 8 in direction 46 and drawing fluid through port 8a , from duct 6 and chamber 2. Bidirectional pump 8 also leaks fluid into duct 7 and chamber 3, creating a pressure differential over piston 4 and causing it to retract rod 5b and extend rod 5th.
    [44] Again, the bidirectional variable speed motor 10 and pump 8 control the speed and force of piston 4 by changing the flow and pressure acting on piston 4 using feedback from the 40 position transducer and/or the transducers of pressure 41 and 42 and then closing the control loop correspondingly adjusting the motor 10 speed and direction.
    [45] Another embodiment 130 is shown in FIG. This embodiment is similar to the embodiment shown in FIG. 2, however, with a three-port pump 28. In this embodiment, the three-port pump 28, instead of the two-port pump 8, is used and the three-port inlet and outlet ratio configuration is matched with piston area ratio 4a/4b. The third port 28c of the pump 28 is connected by a duct 18 to the tank 14. The pump 8, the piston assembly 131 and the tank 14 are connected by a plurality of hydraulic flow ducts 6, 7, 12, 17 and 18 for form a closed fluid system.
    [46] Piston 4 will move to the right to extend rod 5 when bidirectional motor 10 is rotated in a first direction, thereby rotating bidirectional pump 28 in first direction 45 and drawing fluid through port 28b of duct7 and from chamber 8 and through port 28c of duct 18 and reservoir 14. Bidirectional pump 28 also leaks fluid from port 28a into duct 6, closing check valve 9 and thereby isolating duct 6 from reservoir 14. Fluid in duct 6 flows into chamber 2, creating a pressure differential over piston 4 and causing it to extend rod 5.
    [47] Piston 4 will move to the left to retract rod 5 when bidirectional motor 10 is rotated in another direction, thereby rotating bidirectional pump 28 in another direction 46 and extracting fluid through port 28a of duct 6 and of chamber 2. Bidirectional pump 28 leaks fluid from port 28c into ducts 18 and 12 and reservoir 14 and also leaks fluid from port 28b into duct 7, closing check valve 11 and in this way isolating duct 7 from reservoir 14. Fluid in duct 7 flows into chamber 3, creating a pressure differential over piston 4 and causing it to retract rod 5.
    [48] Again, the bidirectional variable speed motor 10 and pump 8 control the speed and force of piston 4 by changing flow 47 or 48 and the pressure acting on piston 4 using feedback from position transducer 40 and/ or from the pressure transducers 41 and 42 and then closing the control loop adjusting the motor 10 speed and direction accordingly.
    [49] Check valves 9 and 11 will open to compensate for system fluid changes caused by actuator leakage to the outside environment or system fluid volume changes due to significant thermal changes. Although not shown, a filter unit can be installed in the fluid ducts between pump 8 and chambers 2 and 3.
    [50] The 100 drive system brings several benefits. Unexpectedly, the 100 system provides drive forces that are large enough to meet the stringent demands of a subsea environment and subsea systems that require rigorous standards and levels of functionality due to the hazard. from an uncontrolled release of oil or gas. System 100 allows actuation at variable speeds and full control of the actuator location within its travel range. System 100 operates independently of a hydraulic system connected to the ocean surface, being a closed system with its own hydraulic supply and return transfer and limited problems of fluid contamination and leaks. Power is not needed when the system is not in use, which improves efficiency. System 100 also provides safety features that have a minimal impact on cost, weight and reliability.
    [51] The present invention contemplates that many modifications and alterations can be made. Thus, although an embodiment of a subsea drive system has been shown and described in the various alternatives presented, those skilled in the art will readily observe that various changes and modifications can be made without departing from the spirit of the invention, as defined by the attached claims.
    权利要求:
    Claims (24)
    [0001]
    1. Subsea drilling, production or processing drive system, characterized in that it comprises: a variable speed electric motor (10) adapted to be powered by a current; a variable speed reversible hydraulic pump (8, 28) driven by said motor; a hydraulic piston assembly (92, 101, 111, 121, 131) connected with said pump and comprising a first chamber (2), a second chamber (3) and a piston (4) separating said first and second chambers and configured to actuate a valve (91) in an underground system; a fluid reservoir (14) connected with said pump and with said hydraulic piston assembly; said pump, hydraulic piston assembly and reservoir connected at a substantially closed hydraulic system; and a pressure compensator (13, 65) configured to normalize pressure differences between the outside of the hydraulic system and the inside of the hydraulic system.
    [0002]
    A subsea drive system according to claim 1, and characterized in that it further comprises a safety mechanism (98).
    [0003]
    3. Subsea drive system according to claim 2, characterized in that the safety mechanism comprises a spring element (36) deflecting said piston in a first direction.
    [0004]
    4. Subsea drive system according to claim 3, characterized in that said safety mechanism comprises a failsafe valve (35) between said first chamber and said second chamber or between said second chamber and said fluid reservoir and said failsafe valve being arranged to open in the event of a power failure to allow equalization of fluid pressure between said first and second chambers on each side of said piston.
    [0005]
    5. Subsea drive system according to claim 2, characterized in that the safety mechanism comprises a two-stage drive.
    [0006]
    6. Subsea drive system according to claim 1, characterized in that it further comprises a filter between said pump and said hydraulic piston assembly.
    [0007]
    7. Subsea drive system according to claim 1, characterized in that said electric motor comprises a brushless DC servo motor.
    [0008]
    8. Subsea drive system according to claim 1, characterized in that said variable speed electric motor is selected from a group consisting of a stepper motor, a brush motor and an induction motor.
    [0009]
    9. Subsea drive system according to claim 1, characterized in that the hydraulic pump is selected from a group consisting of a fixed displacement pump, a variable displacement pump and a three-port pump.
    [0010]
    10. Subsea drive system according to claim 1, characterized in that said pump comprises a two-port pump (8) or a three-port pump (28).
    [0011]
    11. Subsea drive system according to claim 1, characterized in that said piston comprises a first surface area exposed to said first chamber and a second surface area exposed to said second chamber.
    [0012]
    12. Subsea drive system according to claim 11, characterized in that said first surface area (4c) is substantially equal to said second surface area (4b).
    [0013]
    13. Subsea drive system according to claim 11, characterized in that said first surface area (4a) is substantially different from said second surface area (4b).
    [0014]
    14. Subsea drive system according to claim 1, characterized in that said hydraulic piston assembly comprises: a cylinder (1) having a first outer wall (1b), said piston being disposed in said cylinder to a sealed sliding movement therealong; and a first actuator rod (5) connected with said piston for movement therewith and having a portion sealingly penetrating said first outer wall.
    [0015]
    15. Subsea drive system according to claim 14, characterized in that said cylinder has a second outer wall (1a) and that said hydraulic piston assembly comprises a second actuator rod (5a) connected with the said piston for movement thereof and having a portion sealingly penetrating said second outer wall.
    [0016]
    16. Subsea drive system according to claim 1, characterized in that said valve comprises a check valve in a safety shutter
    [0017]
    17. Subsea drive system according to claim 16, characterized in that said check valve comprises a cutter.
    [0018]
    18. Subsea drive system according to claim 1, characterized in that said valve comprises a control valve in a subsea production and processing system.
    [0019]
    19. Subsea drive system according to claim 1, characterized in that the pressure compensator comprises a membrane (15) in said fluid reservoir (13).
    [0020]
    20. Subsea drive system according to claim 1, characterized in that said pressure compensator comprises a piston (67) in a housing (66).
    [0021]
    21. Subsea drive system according to claim 1, characterized in that said valve is in a set selected from a group consisting of a subsea failsafe safety valve, a subsea production Christmas tree or a wellhead system, a subsea processing or separation system, a subsea interconnection system, a subsea strut system, a subsea flotation module and a subsea distribution system.
    [0022]
    22. Subsea drive system according to claim 1, characterized in that it further comprises operationally arranged shut-off valves to selectively isolate said pump from said first and second chambers.
    [0023]
    A subsea drive system according to claim 1, and characterized in that it further comprises a position sensor (40) configured to capture the position of said piston.
    [0024]
    A subsea drive system according to claim 1, and characterized in that it further comprises a pressure sensor (41, 42) configured to sense pressure in said first and second chambers.
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    同族专利:
    公开号 | 公开日
    EP2683907A2|2014-01-15|
    RU2544927C1|2015-03-20|
    WO2012122159A2|2012-09-13|
    WO2012122159A3|2013-08-01|
    CA2828987A1|2012-09-13|
    RU2013144747A|2015-04-20|
    JP2014512495A|2014-05-22|
    CN103429911A|2013-12-04|
    EP2683907B1|2015-05-06|
    US9631455B2|2017-04-25|
    CN103429911B|2017-02-08|
    US20130333894A1|2013-12-19|
    CA2828987C|2016-01-19|
    BR112013022783A2|2016-12-06|
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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]|
    2020-07-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-29| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161449740P| true| 2011-03-07|2011-03-07|
    US61/449,740|2011-03-07|
    PCT/US2012/027852|WO2012122159A2|2011-03-07|2012-03-06|Subsea actuation system|
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