Offshore injection-production integrated regulating valve

Abstract

The present application relates to a kind of offshore injection-production integrated regulating valve, including steam injection mechanism, production mechanism and connecting piece, steam injection mechanism is connected with production mechanism by connecting piece clamping;Steam injection mechanism includes steam injection passage, steam inlet device, anti-return device and steam injection stroke adjusting device, steam inlet end of steam injection passage is equipped with steam inlet device, one end of anti-return device can be slidably inserted into the gas outlet end of steam injection passage, the other end of anti-return device is connected with the one end of steam injection stroke adjusting device, steam to be injected enters steam injection passage and can act on anti-return device, to realize anti-return device compression steam injection stroke adjusting device complete steam injection.The present application uses one tool to meet the requirements of steam injection and production simultaneously, and can realize segmented separation even steam injection, can meet the steam injection requirements of different layer.

Description

Technical Field

[0001] This invention relates to the field of offshore heavy oil extraction technology, specifically to an integrated offshore injection and extraction control valve. Background Technology

[0002] Heavy oil is crude oil with high asphaltene and gum content and high viscosity. However, due to its high viscosity, heavy oil reservoirs are not easily flowable, making heavy oil development a challenge. Current technologies use steam injection to reduce the viscosity of heavy oil. However, for many years, due to the limitations of high-temperature and high-pressure operating conditions, a two-run injection-production process has been used for both heating and production. This not only occupies platform space resources for a long time and increases investment in thermal recovery operations, but also frequently washes and kills wells, affecting thermal energy utilization.

[0003] To address this issue, an integrated injection and production control valve for offshore applications was designed, capable of simultaneously meeting the requirements of steam injection and production. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated injection and production control valve for offshore oil to solve the problem in the above-mentioned background technology that heavy oil production and steam injection cannot be integrated.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A marine injection and production integrated control valve includes a steam injection mechanism, a production mechanism, and a connecting component, wherein the steam injection mechanism and the production mechanism are connected by the connecting component.

[0007] The steam injection mechanism includes a steam injection channel, a steam inlet device, an anti-backflow device, and a steam injection stroke adjustment device. The steam inlet device is provided at the steam inlet end of the steam injection channel. One end of the anti-backflow device can be slidably inserted into the steam outlet end of the steam injection channel. The other end of the anti-backflow device is connected to one end of the steam injection stroke adjustment device. After the steam enters the steam injection channel, it can act on the anti-backflow device to realize that the anti-backflow device compresses the steam injection stroke adjustment device to complete the steam injection.

[0008] The production mechanism includes an injection body and a sealing device. The other end of the steam injection stroke adjustment device is connected to one end of the injection body via the connector. The injection body is provided with multiple oil inlets. The sealing device is located outside the oil inlets and can move along the surface of the injection body.

[0009] Preferably, the steam injection mechanism further comprises a center pipe and an outer pipe, the outer part of the center pipe is provided with the outer pipe, the steam injection channel is formed between the center pipe and the outer pipe, the center pipe is provided with a steam injection port and a steam outlet port, the steam injection port is provided with the steam inlet device, the bottom of the outer pipe is provided with a limiting structure, and the anti-backflow device is clamped by the limiting structure after being inserted into the steam injection channel.

[0010] Preferably, the steam inlet device comprises a steam nozzle, a sealing gasket and a pressure cap, the steam nozzle is communicated with the steam outlet port, the steam nozzle is arranged on the sealing gasket, and the pressure cap is arranged at the end of the steam outlet port.

[0011] Preferably, the anti-backflow device comprises an anti-backflow valve and a high-temperature sealing ring, the anti-backflow valve is sleeved on the outer pipe, the high-temperature sealing ring is arranged at the groove of the anti-backflow valve, one end of the anti-backflow valve is clamped by the limiting structure after being inserted into the steam injection channel, and the other end of the anti-backflow valve is connected with the steam injection stroke adjusting device.

[0012] Preferably, the steam injection stroke adjusting device comprises a first spring and an adjusting ring, one end of the first spring is connected with the anti-backflow valve, the other end of the first spring is connected with the adjusting ring, the adjusting ring is fixed with the center pipe through threads, and the adjusting ring is connected with the connecting piece.

[0013] Preferably, the steam injection mechanism further comprises an upper joint, and the center pipe and the outer pipe are connected through the upper joint.

[0014] Preferably, the sealing device comprises a valve rod, a second spring and a plug, the valve rod is arranged in the piston cavity of the injection main body and arranged outside the oil inlet port, the bottom of the valve rod is provided with the second spring, and the plug is arranged in the side hole of the injection main body.

[0015] Preferably, the bottom of the injection main body is further provided with an injection lower joint, the top of the injection main body is connected with the connecting piece, the injection lower joint is connected with the second spring and connected with the bottom of the injection main body through threads.

[0016] Preferably, a blocking ring is arranged between the injection main body and the injection lower joint.

[0017] The offshore injection-production integrated regulating valve, preferably, the connecting piece comprises a lower joint and an injection joint, the lower joint is connected with the regulating ring, the injection joint is connected with the injection body through threads, and the lower joint is connected with the injection joint.

[0018] The offshore injection-production integrated regulating valve has the following advantages:

[0019] 1. The contact part of the anti-backflow valve and the outer pipe adopts a metal-to-metal sealing mode, which avoids the entry of annular space substances into the tool when steam injection is not performed, and ensures long-term effective use of the tool.

[0020] 2. The sealing element of the production mechanism and the injection body adopt a metal-to-metal sealing mode, which ensures good sealing performance at a high temperature of 350 DEG C.

[0021] 3. The offshore injection-production integrated regulating valve provided by the application can meet the requirements of steam injection and production at the same time, reduces the cost of thermal recovery operation, improves the overall economic benefit of thermal recovery, and can realize segmented and separated uniform steam injection and meet the steam injection requirements of different layers. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the offshore injection-production integrated regulating valve provided by the application;

[0023] Figure 2 is an enlarged view of A;

[0024] Figure 3 is an enlarged view of B;

[0025] Figure 4 is an enlarged view of C.

[0026] Reference signs in the drawings:

[0027] 1. upper joint; 2. central pipe; 3. outer pipe; 4. anti-backflow valve; 5. first spring;

[0028] 6. regulating ring; 7. lower joint; 8. high-temperature sealing ring; 9. steam nozzle; 10. pressure cap;

[0029] 11. sealing gasket; 12. valve rod; 13. second spring; 14. injection lower joint; 15. injection joint;

[0030] 16. injection body; 17. plug; 18. stop ring; 19. steam injection channel; 21. steam injection port;

[0031] 22. steam outlet; 23. oil inlet; 24. oil port. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] In the description of this invention, it should be noted that the terms "top", "bottom", "one end", "the other end", "first", and "second" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up" and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] This invention provides an integrated injection and production control valve for offshore applications. The invention includes an injection mechanism, a production mechanism, and a connector, with the injection mechanism and the production mechanism interlocked via the connector.

[0036] The steam injection mechanism includes a steam injection channel, a steam inlet device, an anti-backflow device, and a steam injection stroke adjustment device. The steam inlet end of the steam injection channel is equipped with a steam inlet device. One end of the anti-backflow device can be slidably inserted into the steam outlet end of the steam injection channel. The other end of the anti-backflow device is connected to one end of the steam injection stroke adjustment device. After the steam to be injected enters the steam injection channel, it can act on the anti-backflow device to realize the anti-backflow device compressing the steam injection stroke adjustment device to complete the steam injection.

[0037] The production mechanism includes an injection body and a sealing device. The other end of the steam injection stroke adjustment device is connected to one end of the injection body by a connector. The injection body is provided with multiple oil inlets. The sealing device is located outside the oil inlets and can move along the surface of the injection body.

[0038] This invention integrates steam injection and collection, allowing a single tool to simultaneously meet the requirements of steam injection and production, reducing the cost of thermal recovery operations, improving the overall economic benefits of thermal recovery, and enabling segmented and uniform steam injection to meet the steam injection requirements of different strata.

[0039] Below, the offshore injection-production integrated regulating valve provided by the embodiment of the present application is described in detail with reference to the drawings.

[0040] Referring to Figure 1 As shown in the drawings, an offshore injection-production integrated regulating valve comprises a steam injection mechanism and a production mechanism, and the steam injection mechanism is connected with the production mechanism through a connecting piece.

[0041] Continuing to refer to Figure 1 , the steam injection mechanism comprises a steam inlet device, an upper joint 1, a central pipe 2, an outer pipe 3, a backflow prevention valve 4, a first spring 5 and a regulating ring 6, the outer pipe 3 is arranged outside the central pipe 2, the upper joint 1 is connected with the central pipe 2 and the outer pipe 3 through threads respectively, and a gap is arranged between the central pipe 2 and the outer pipe 3, i.e. a steam injection channel 19 is formed.

[0042] The central pipe 2 is provided with a cavity, preferably, the central pipe 2 is a cylindrical hollow pipe, the central pipe 2 is provided with a steam injection port 21 and a steam outlet port 22, the steam injection port 21 and the steam outlet port 22 are arranged at a steam inlet end of the steam injection channel 19, the steam injection port 21 and the steam outlet port 22 are both inclined holes, the steam injection port 21 is connected with the steam inlet device, steam is injected into the backflow prevention valve 4 through the steam inlet device, and the steam is discharged from the steam outlet port 22.

[0043] Continuing to refer to Figure 1 and Figure 2 , the steam inlet device comprises a steam nozzle 9, a sealing gasket 11 and a pressure cap 10, the steam nozzle 9 is connected with the steam injection port 21, the steam nozzle 9 is pressed on the sealing gasket 11, and then the pressure cap 10 is installed, and the sealing gasket 11 prevents steam injected by the steam nozzle 9 from leaking out. The material of the steam nozzle 9 is hard alloy.

[0044] Continuing to refer to Figure 1 and Figure 3 , the backflow prevention valve 4 can slide outside the central pipe 2, one end of the backflow prevention valve 4 is inserted into a steam outlet end of the steam injection channel 19, the steam outlet end of the steam injection channel 19 is provided with the limiting structure, and the limiting structure clamps the backflow prevention valve 4. Preferably, the limiting structure is a slope arranged at the end of the backflow prevention valve 4 and the end of the outer pipe 3, the backflow prevention valve 4 and the end of the outer pipe 3 are inserted into the steam injection channel 19 through the slope, the slope of the backflow prevention valve 14 is shorter than the slope of the outer pipe 3, so that after the backflow prevention valve 4 is inserted into the steam injection channel 19, the backflow prevention valve 4 and the outer pipe 3 realize metal-to-metal sealing, and when the backflow prevention valve 4 is pressed by steam and slides out of the steam injection channel 19.

[0045] A scale-resistant coating is sprayed on the contact surface between the backflow prevention valve 4 and the outer pipe 3.

[0046] Continuing to refer to Figure 1 and Figure 3 , the groove of the backflow prevention valve 4 is provided with a high-temperature sealing ring 8.

[0047] The other end of the anti-backflow valve 4 is connected with one end of the first spring 5, and the other end of the first spring 5 is connected with the adjusting ring 6, which is connected with the central pipe 2 through screw thread, and can adjust the compression degree of the first spring 5.

[0048] Continuing to refer to Figure 1 and Figure 4 , the production mechanism comprises an injection body 16 and a sealing device, the injection body 16 is provided with a plurality of oil inlets 23, the sealing device is arranged outside the oil inlets 23, and the sealing device can move along the surface of the injection body 16.

[0049] The sealing device comprises a valve rod 12 and a second spring 13, the valve rod 12 is arranged in the piston cavity of the injection body 16 and outside the oil inlets 23, the right side of the valve rod 12 is provided with a slope sealing surface for shielding the oil inlets 23, the bottom of the valve rod 12 is connected with one end of the second spring 13, the bottom of the injection body 16 is provided with an injection lower joint 14 through screw thread, the other end of the second spring 13 is connected with the injection lower joint 14, and the injection lower joint 14 can adjust the compression degree of the second spring 13 through screw thread rotation. Preferably, a blocking ring 18 is arranged between the bottom of the injection body 16 and the injection lower joint 14. The extracted liquid flows into the side hole to compress the valve rod 12, the valve rod 12 drives the second spring 13 to move downward to compress the second spring 13, so that the oil inlets 23 are exposed, and the liquid entering from the side hole enters the oil inlets 23.

[0050] The sealing device further comprises a plug 17, which is arranged in the side hole of the injection body 16 for convenient processing.

[0051] Continuing to refer to Figure 1 , the connecting piece comprises a lower joint 7 and an injection joint 15, the lower joint 7 is connected with the adjusting ring 6, the injection joint 15 is connected with the injection body 16 through screw thread, and the lower joint 7 is connected with the injection joint 15.

[0052] When steam injection is performed, the production mechanism is closed; when production is performed, the steam injection channel 19 is closed. The use of the high-temperature sealing ring 8 meets the requirement of a working temperature of 350℃, the spraying of the anti-fouling coating can greatly improve the use efficiency and service life of the tool, meets the running-in requirement of an internal diameter of 4.75in, and the single-tool displacement is about 50t / d.

[0053] When the steam injection mechanism works: when the steam injection operation is carried out through the oil pipe, the production mechanism is closed. The steam enters the cavity of the center pipe 2, the steam acts on the anti-return valve 4 through the steam nozzle 9, the anti-return valve 4 is compressed by the first spring 5 pushed by the steam, the steam is discharged through the steam outlet 22, so that the steam injection to the formation is realized. The design of the steam nozzle 9 and the use of the high-temperature sealing gasket 8 ensure good steam injection efficiency. The contact part of the anti-return valve 4 with the outer pipe 3 adopts a metal-to-metal sealing mode, and is sprayed with an anti-fouling coating, which avoids the entry of annulus substances into the tool when no steam injection is carried out, and ensures the long-term effective use of the tool.

[0054] When the production mechanism works: the production mechanism adopts the design principle of a one-way valve, and the steam injection mechanism is closed when the production operation is carried out through the oil pipe. During production, the crude oil enters through the oil port 24, the crude oil enters the valve rod 12 to generate pressure, the valve rod 12 compresses the second spring 13 to open the ring control channel, and the crude oil enters the oil pipe through the oil inlet port 23 to produce. When steam injection, the valve rod 12 and the injection main body 16 form a metal-to-metal seal to prevent substances in the annulus from entering. At the same time, the metal-to-metal sealing form ensures good sealing performance at a high temperature of 350°C.

[0055] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A subsea injection and production integrated regulating valve, characterized in that, It comprises a steam injection mechanism, a production mechanism and a connecting piece, the steam injection mechanism is connected with the production mechanism through the connecting piece; The steam injection mechanism comprises a steam injection channel, a steam inlet device, a backflow prevention device and a steam injection stroke adjusting device, the steam inlet end of the steam injection channel is provided with the steam inlet device, one end of the backflow prevention device is slidably inserted into the steam outlet end of the steam injection channel, the other end of the backflow prevention device is connected with one end of the steam injection stroke adjusting device, and steam entering the steam injection channel can act on the backflow prevention device to realize the compression of the backflow prevention device on the steam injection stroke adjusting device to complete steam injection; The production mechanism comprises an injection main body and a sealing device, the other end of the steam injection stroke adjusting device is connected with one end of the injection main body through the connecting piece, a plurality of oil inlet ports are arranged on the injection main body, the sealing device is arranged outside the oil inlet port, and the sealing device can move along the surface of the injection main body; The steam injection mechanism further comprises a center pipe and an outer pipe, the outer part of the center pipe is provided with the outer pipe, the center pipe and the outer pipe form the steam injection channel, the center pipe is provided with a steam injection port and a steam outlet port, the steam injection port is provided with the steam inlet device, the bottom of the outer pipe is provided with a limiting structure, and the backflow prevention device is clamped by the limiting structure after being inserted into the steam injection channel; The backflow prevention device comprises a backflow prevention valve and a high-temperature sealing ring, the backflow prevention valve is sleeved on the outer pipe, the high-temperature sealing ring is arranged at the groove of the backflow prevention valve, one end of the backflow prevention valve is clamped by the limiting structure after being inserted into the steam injection channel, and the other end of the backflow prevention valve is connected with the steam injection stroke adjusting device; The steam injection stroke adjusting device comprises a first spring and an adjusting ring, one end of the first spring is connected with the backflow prevention valve, the other end of the first spring is connected with the adjusting ring, the adjusting ring is fixed with the center pipe through threads, and the adjusting ring is connected with the connecting piece; The sealing device comprises a valve rod, a second spring and a plug, the valve rod is arranged in the piston cavity of the injection main body and outside the oil inlet port, the bottom of the valve rod is provided with the second spring, the plug is arranged in the side hole of the injection main body, and the right side of the valve rod is provided with a slope sealing surface for shielding the oil inlet port; The steam inlet device comprises a steam nozzle, a sealing gasket and a pressure cap, the steam nozzle is communicated with the steam outlet port, the steam nozzle is arranged on the sealing gasket, and the pressure cap is arranged at the end of the steam outlet port; The bottom of the injection main body is further provided with an injection lower joint, the top of the injection main body is connected with the connecting piece, the injection lower joint is connected with the second spring and connected with the bottom of the injection main body through threads; A blocking ring is arranged between the injection main body and the injection lower joint.

2. The offshore injection-production regulating valve according to claim 1, characterized in that The steam injection mechanism further comprises an upper joint, the center pipe and the outer pipe are connected through the upper joint.

3. The offshore injection-production regulating valve according to claim 2, characterized in that The connecting piece comprises a lower joint and an injection joint, the lower joint is connected with the adjusting ring, the injection joint is connected with the injection main body through threads, and the lower joint is connected with the injection joint.

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