Adjustable Underwater Pressure Compensation Device

Abstract

The present invention relates to an adjustable underwater pressure compensation device, which includes a pressure compensation module, a valve core assembly and a valve core locking assembly. When pressure compensation is required, the wire is powered off, spring A retracts, driving the valve core away from the valve hole, and the liquid in the inner cavity of the housing communicates with the liquid outside the housing. The variable-diameter bellows deforms to balance the pressure of the liquid outside the housing with the pressure of the liquid in the inner cavity of the variable-diameter bellows; when pressure compensation is not required, the wire is powered on, the driving magnet repels the valve core, the valve core blocks the valve hole, spring A is stretched, and at the same time, the pressure of the liquid outside the housing is increased, driving the valve core locking assembly to lock the valve core, so that the liquid in the inner cavity of the housing does not communicate with the liquid outside the housing, and the pressure of the liquid outside the housing changes independently, without being affected by the pressure of the liquid in the inner cavity of the housing and the inner cavity of the variable-diameter bellows. In addition to having the same pressure compensation ability as a conventional pressure compensator, the present invention can automatically turn off the pressure compensation function according to needs, and the device has a simple structure and is convenient to operate.

Description

Technical Field

[0001] The present invention relates to the field of underwater pressure compensators, and particularly to an adjustable underwater pressure compensation device. Background Art

[0002] With the continuous emergence of deep wells and ultra-deep wells in oil and gas exploitation, the bottom-hole pressure is getting higher and higher, and the pressure-bearing capacity requirements for downhole equipment are also increasing; at the same time, offshore oil exploitation has entered the deep-sea stage, with a exploitation depth of more than 3000 m, and the pressure-bearing capacity of underwater equipment is also facing a severe test. Using an underwater pressure compensator can reduce the size of underwater equipment or increase the applicable water depth of underwater equipment. Currently, there are compensators such as piston type, bladder type, bellows type, etc., but during the working process, the compensation function cannot be automatically adjusted. For some downhole tools or underwater instruments, when an operation needs to be performed, the pressure compensation function needs to be turned off, otherwise the operation cannot be successfully carried out. For example, an intelligent variable-diameter stabilizer (ZL202110358137.4) changes the pressure in the hydraulic cavity through piston movement to perform variable-diameter operation. If a pressure compensation device is installed, during the variable-diameter operation, due to the pressure compensation function of the pressure compensator, the pressure in the hydraulic cavity of the variable-diameter stabilizer cannot change independently, resulting in the variable-diameter stabilizer being unable to perform variable-diameter operation, thus causing the variable-diameter failure of the variable-diameter stabilizer. Therefore, it is necessary to study a pressure compensation device with adjustable pressure compensation ability. Summary of the Invention

[0003] The purpose of the present invention is to provide an adjustable underwater pressure compensation device.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention to solve this technical problem is:

[0005] Adjustable underwater pressure compensation device, comprising a pressure compensation module, a valve core assembly and a valve core locking assembly, characterized in that: the pressure compensation module comprises a housing and a variable-diameter bellows, the variable-diameter bellows is installed inside the housing, and forms an inner cavity of the housing with the housing; the valve core assembly comprises a valve core, spring A, nut, wire, drive magnet and connecting rod, the drive magnet, nut, spring A and valve core are sleeved on the connecting rod in sequence, the drive magnet is fixed on the connecting rod by the nut, and the wire is wound around the drive magnet; the valve core locking assembly is installed in the stepped through hole of the housing; when pressure compensation is required, the wire is powered off, spring A retracts towards the drive magnet, driving the valve core away from the valve hole, the liquid in the inner cavity of the housing is communicated with the liquid outside the housing, and the variable-diameter bellows deforms to balance the pressure of the liquid outside the housing and the pressure of the liquid in the inner cavity of the variable-diameter bellows. At this time, the adjustable underwater pressure compensation device has the function of pressure compensation; when pressure compensation is not required, the wire is powered on, the drive magnet repels the valve core, the valve core blocks the valve hole, spring A is stretched, and at the same time, the pressure of the liquid outside the housing is increased, driving the valve core locking assembly to lock the valve core, so that the liquid in the inner cavity of the housing is not communicated with the liquid outside the housing, and the pressure of the liquid outside the housing changes independently, not affected by the pressure of the liquid in the inner cavity of the housing and the pressure of the liquid in the inner cavity of the variable-diameter bellows. At this time, the adjustable underwater pressure compensation device does not have the function of pressure compensation.

[0006] One end of the housing is processed with a valve hole, a platform is processed, and a stepped through hole and a threaded hole are processed on the platform.

[0007] The valve core is provided with a card slot, a spring support platform and a sliding slot, and the connecting rod is provided with a wire slot and a thread.

[0008] The valve core locking assembly comprises a valve sleeve, spring B, sealing ring and locking rod. The locking rod is placed into the stepped through hole of the platform, and then spring B is placed. The valve sleeve is connected to the housing through the threaded hole. One end of the locking rod is a sphere and the other end is a hemisphere; when the valve core locking assembly locks the valve core, the sphere leaves the valve sleeve and the hemisphere enters the card slot of the valve core to lock the valve core.

[0009] Compared with the prior art, the beneficial effects of the present invention are: in addition to having the same pressure compensation ability as a conventional pressure compensator, it can also automatically turn off the pressure compensation function according to needs, and the device has a simple structure and is convenient to operate. Description of the Drawings

[0010] Appendix Figure 1 Is the structural schematic diagram of the adjustable underwater pressure compensation device of the present invention

[0011] Figure 2 For the present invention Figure 1 The three-dimensional schematic diagram of the housing 1 in

[0012] Figure 3 For the present invention Figure 1Partial enlarged sectional view of the middle spool locking assembly when not locked

[0013] Figure 4 This is the present invention Figure 1 Partial enlarged sectional view of the middle spool locking assembly when locked

[0014] Figure 5 This is the present invention Figure 1 Three-dimensional schematic diagram of the connecting rod 8 in the middle

[0015] Figure 6 Schematic structural diagram of the present invention installed in an intelligent variable-diameter stabilizer

[0016] In the figure: 1. Housing, 101. Valve hole, 102. Platform, 103. Step through hole, 104. Threaded hole, 2. Variable-diameter bellows, 3. Spool, 301. Card slot, 302. Spring base platform, 303. Sliding slot, 4. Spring A, 5. Nut, 6. Conducting wire, 7. Driving magnet, 8. Connecting rod, 801. Conducting wire groove, 802. Thread, 9. Valve sleeve, 10. Spring B, 11. Sealing ring, 12. Locking rod, 1201. Sphere, 1202. Hemisphere, 13. Inner cavity of the housing, 14. Motor shaft, 1401. Through hole, 15. Motor, 16. Ring piston, 17. Variable-diameter stabilizer housing, 18. Pushing block Specific embodiments

[0017] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Such as Figures 1 to 5As shown in the figure, the adjustable underwater pressure compensation device includes a pressure compensation module, a valve core assembly, and a valve core locking assembly, and is characterized in that: the pressure compensation module includes a housing 1 and a variable-diameter bellows 2, and the variable-diameter bellows 2 is installed inside the housing 1 to form an inner cavity 13 of the housing with the housing 1; the valve core assembly includes a valve core 3, a spring A 4, a nut 5, a wire 6, a driving magnet 7, and a connecting rod 8. The driving magnet 7, the nut 5, the spring A 4, and the valve core 3 are sequentially sleeved on the connecting rod 8, and the driving magnet 7 is fixed on the connecting rod 8 by the nut 5, and the wire 6 is wound around the driving magnet 7; the valve core locking assembly is installed in the stepped through hole 103 of the housing 1; when pressure compensation is required, the wire 6 is powered off, and the spring A 4 retracts towards the driving magnet 7, driving the valve core 3 away from the valve hole 101, and the liquid in the inner cavity 13 of the housing is communicated with the liquid outside the housing 1. The variable-diameter bellows 2 deforms to balance the pressure of the liquid outside the housing 1 and the pressure of the liquid in the inner cavity of the variable-diameter bellows 2. At this time, the adjustable underwater pressure compensation device has the function of pressure compensation; when pressure compensation is not required, the wire 6 is powered on, the driving magnet 7 repels the valve core 3, the valve core 3 blocks the valve hole 101, the spring A 4 is stretched, and at the same time, the pressure of the liquid outside the housing 1 is increased, driving the valve core locking assembly to lock the valve core 3, so that the liquid in the inner cavity 13 of the housing is not communicated with the liquid outside the housing 1, and the pressure of the liquid outside the housing 1 changes independently and is not affected by the pressure of the liquid in the inner cavity 13 of the housing and the pressure of the liquid in the inner cavity of the variable-diameter bellows 2. At this time, the adjustable underwater pressure compensation device does not have the function of pressure compensation.

[0019] As Figure 2 , Figure 3 and Figure 4 shown, one end of the housing 1 is machined with a valve hole 101, a platform 102 is machined, and a stepped through hole 103 and a threaded hole 104 are machined on the platform 102.

[0020] As Figure 1 and Figure 5 shown, the valve core 3 is provided with a card slot 301, a spring support platform 302, and a sliding slot 303, and the connecting rod 8 is provided with a wire slot 801 and a thread 802.

[0021] As Figure 1 , Figure 3 and Figure 4 shown, the valve core locking assembly includes a valve sleeve 9, a spring B 10, a sealing ring 11, and a locking rod 12. The locking rod 12 is placed into the stepped through hole 103 of the platform 102, and then the spring B 10 is placed. The valve sleeve 9 is connected to the housing 1 through the threaded hole 104. When the pressure of the liquid outside the housing 1 does not reach the set value, the sphere 1201 blocks the valve sleeve 9, and the hemisphere 1202 is inside the stepped through hole 104; when the pressure of the liquid outside the housing 1 exceeds the set value, the liquid outside the housing 1 pushes the sphere 1201 away, and the locking rod 12 moves towards the card slot 301 until the hemisphere 1202 is stuck in the card slot 301, so that the valve core 3 cannot move axially.

[0022] The operation process of the present invention is as follows:

[0023] As shown in Figure 1 , Figure 3 , Figure 4 and Figure 6 , taking the installation inside an intelligent variable-diameter stabilizer (ZL202110358137.4) of an invention patent as an example, the adjustable underwater pressure compensation device is sleeved on the motor shaft 14, and a through hole 1401 is machined at the part of the motor shaft 14 where the adjustable underwater pressure compensation device is installed. During the drilling process of the variable-diameter stabilizer, when there is no variable-diameter operation, the drilling fluid passes through the inner cavity of the motor shaft 14, and at the same time, the drilling fluid enters the inside of the variable-diameter bellows 2 through the through hole 1401. At this time, the wire 6 is in a power-off state, and the spring A4 drives the valve core 3 away from the valve hole 101, so that the liquid in the closed cavity between the outside of the housing 1 and the housing 17 of the variable-diameter stabilizer communicates with the liquid in the inner cavity 13 of the housing. When the pressure of the liquid in this sealed cavity is different from that of the drilling fluid, the variable-diameter bellows 2 deforms, so that the pressure of the liquid in the sealed cavity is balanced with the pressure of the drilling fluid in the inner cavity of the motor shaft 14. When a variable-diameter operation is required, the wire 6 is energized, the driving magnet 7 repels the valve core 3, the valve core 3 blocks the valve hole 101, and the spring A4 is stretched, so that the liquid in the closed cavity between the outside of the housing 1 and the housing 17 of the variable-diameter stabilizer does not communicate with the liquid in the inner cavity 13 of the housing. The pressure of the liquid in the closed cavity can vary independently and is not affected by the pressure of the liquid in the inner cavity 13 of the housing and the pressure of the drilling fluid in the inner cavity of the motor shaft 14. At this time, the adjustable underwater pressure compensation device does not have the pressure compensation function; in order to prevent, during the variable-diameter operation of an intelligent variable-diameter stabilizer, once the pressure of the drilling fluid in the inner cavity of the motor shaft 14 changes too much, and the force of the driving magnet 7 driving the valve core 3 is too small, causing the valve core 3 to disengage from the valve hole 101 and the independent change of the pressure of the liquid in the closed cavity to fail, a driving valve core locking assembly is provided to lock the valve core 3. At this time, the wire 6 can be powered off. The motor 15 is energized to drive the annular piston 16 to move to the right. The piston compresses the liquid in the closed cavity, increasing the pressure of the liquid in the closed cavity. After increasing to the set value, the locking rod sphere 1201 is pushed open, the locking rod 12 moves, and locks the valve core 3, so that the valve core 3 cannot move axially. At this time, the variable-diameter mechanism performs a variable-diameter operation in which the push block 18 extends outward. When the push block 18 retracts, first, the adjustable underwater pressure compensation device does not have the pressure compensation function, and the valve core 3 is locked through the valve core locking assembly, and then the variable-diameter operation of the retraction of the push block 18 is performed.

[0024] The above specific embodiments are used to illustrate the present invention rather than limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. An adjustable underwater pressure compensation device, comprising a pressure compensation module, a valve core assembly and a valve core locking assembly, characterized in that: The pressure compensation module includes a housing (1) and a variable diameter bellows (2). The variable diameter bellows (2) is installed inside the housing (1) and forms an inner cavity (13) of the housing with the housing (1). The valve core assembly includes a valve core (3), a spring A (4), a nut (5), a wire (6), a driving magnet (7) and a connecting rod (8). The driving magnet (7), the nut (5), the spring A (4) and the valve core (3) are sequentially sleeved on the connecting rod (8). The driving magnet (7) is fixed on the connecting rod (8) through the nut (5). The wire (6) is wound around the driving magnet (7). The valve core locking assembly is installed in the stepped through hole (103) of the housing (1). When pressure compensation is required, the wire (6) is powered off, and the spring A (4) retracts towards the driving magnet (7), driving the valve core (3) away from the valve hole (101). The liquid in the inner cavity (13) of the housing is communicated with the liquid outside the housing (1), and the variable diameter bellows (2) deforms to balance the pressure of the liquid outside the housing (1) with the pressure of the liquid in the inner cavity of the variable diameter bellows (2). At this time, the adjustable underwater pressure compensation device has the function of pressure compensation. When pressure compensation is not required, the wire (6) is powered on, the driving magnet (7) repels the valve core (3), the valve core (3) blocks the valve hole (101), the spring A (4) is stretched, and at the same time, the pressure of the liquid outside the housing (1) is increased, driving the valve core locking assembly to lock the valve core (3). The valve core locking assembly includes a valve sleeve (9), a spring B (10), a sealing ring (11), and a locking rod (12). The locking rod (12) is placed into the stepped through hole (103) of the platform (102), and then the spring B (10) is placed. The valve sleeve (9) is connected to the housing (1) through a threaded hole (104). One end of the locking rod (12) is a sphere (1201), and the other end is a hemisphere (1202). When the valve core locking assembly locks the valve core (3), the sphere (1201) leaves the valve sleeve (9), and the hemisphere (1202) enters the card slot (301) of the valve core (3) to lock the valve core (3), so that the liquid in the inner cavity (13) of the housing is not communicated with the liquid outside the housing (1), and the pressure of the liquid outside the housing (1) changes independently and is not affected by the pressure of the liquid in the inner cavity (13) of the housing and the pressure of the liquid in the inner cavity of the variable diameter bellows (2). At this time, the adjustable underwater pressure compensation device does not have the function of pressure compensation.

2. An adjustable underwater pressure compensation device according to claim 1, characterized in that: One end of the housing (1) is processed with a valve hole (101), a platform (102) is processed, and a stepped through hole (103) and a threaded hole (104) are processed on the platform (102).

3. An adjustable underwater pressure compensation device according to claim 1, characterized in that: The valve core (3) is provided with a card slot (301), a spring support platform (302), and a sliding slot (303). The connecting rod (8) is provided with a wire slot (801) and a thread (802).

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