Gas compression pressure-bearing type conventional well flushing control valve

Abstract

The utility model provides a gas compression pressure-bearing type well flushing control valve, relates to the technical field of oil extraction, and solves the technical problem that a well flushing control valve with a simple structure is lacked in forward well flushing in the prior art. The device comprises an upper connector, an outer cylinder, a supporting core sleeve, a lower connector, an air pressure structure and a supporting arm, the upper connector and the lower connector are sleeved with the two ends of the outer cylinder respectively, the supporting core sleeve is located in the outer cylinder, the interior of the lower connector is connected with the lower end of the supporting core sleeve, and an annular containing space is formed among the outer cylinder, the supporting core sleeve and the lower connector; the air pressure structure and the supporting arm are both located in the annular containing space, the air pressure structure is filled with air, and the supporting arm can move in the annular containing space. An annular through opening is formed between the lower end of the upper connector and the supporting core sleeve, a circulation hole is formed in the side wall of the outer cylinder, the annular through opening and the circulation hole are communicated through the annular containing space, and a communication path between the annular through opening and the circulation hole can be blocked or communicated under the movement of the supporting arm.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production, in particular to a gas compression pressure-bearing positive flushing well control valve. Background Art

[0002] A large number of oil production wells in the oilfield need to be hot-washed regularly according to the hot-washing cycle. The current well-washing method is reverse well-washing, that is, hot water is injected into the annular space (casing-tubing annulus) between the casing and the tubing, and is sucked back into the tubing by the sucker rod pump. The amount of well-washing fluid used for a single well in a single reverse well-washing is 30 cubic meters, and the static liquid column pressure per kilometer is 10 MPa. After superimposing the pump pressure, it exceeds the formation static pressure, causing a large amount of well-washing fluid to enter the formation, resulting in formation pollution, increasing the drainage time after well-washing, affecting the oil production, and the well-washing fluid generates heat exchange with various media after entering the casing, resulting in large heat loss, and the temperature difference between the well-washing fluid temperature after entering the tubing and the inlet temperature is large, affecting the hot-washing quality. Therefore, considering positive well-washing from the tubing to the casing-tubing annulus, only 6-8 cubic meters of well-washing fluid can achieve the effect of 30 cubic meters of reverse well-washing, saving a large amount of well-washing fluid. And the well-washing pump pressure acts inside the tubing, and the formation only bears the static liquid column pressure, which can greatly reduce the amount of well-washing fluid entering the formation, shorten the drainage time after well-washing, and effectively avoid formation pollution. However, the existing positive well-washing lacks a well-washing control valve with a simple structure and convenient application. Content of the Utility Model

[0003] The purpose of the utility model is to provide a gas compression pressure-bearing positive flushing well control valve to solve the technical problem that there is a lack of a well-washing control valve with a simple structure in the existing positive well-washing. The preferred technical solutions provided by the utility model can produce many technical effects, which will be described in detail below.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A gas compression pressure-bearing positive flushing well control valve provided by the utility model includes an upper joint, an outer cylinder, a support core sleeve, a lower joint, a pneumatic structure and a support arm. Among them, both ends of the outer cylinder are sleeved on the upper joint and the lower joint and are sealed and connected. The support core sleeve is located inside the outer cylinder, and the inside of the lower joint is connected to the lower end of the support core sleeve. An annular accommodation space is formed among the outer cylinder, the support core sleeve and the lower joint. Both the pneumatic structure and the support arm are located in the annular accommodation space, and the pneumatic structure is filled with gas, and the support arm can move in the annular accommodation space;

[0006] There is an annular through-port between the lower end of the upper joint and the support core sleeve. A flow hole is provided on the side wall of the outer cylinder. The annular through-port is communicated with the flow hole through the annular accommodation space. The communication path between the annular through-port and the flow hole can be blocked or communicated under the movement of the support arm.

[0007] Optionally, the pneumatic structure includes a cylinder body and a piston sleeve. Both the cylinder body and the piston sleeve are located in the annular accommodation space. One end of the piston sleeve is located inside the cylinder body, and the other end of the piston sleeve is connected to the support arm. The cylinder body is filled with gas.

[0008] Optionally, a one-way inflation valve is provided at the lower end of the cylinder body.

[0009] Optionally, the outer wall of the upper end of the support arm is provided with a first inclined structure, a limiting end face, and a hydraulic end face. The limiting end face is located below the first inclined structure, and the hydraulic end face is located above the first inclined structure. A second inclined structure is provided on the inner wall of the lower end of the upper joint. The first inclined structure and the second inclined structure can be sealed by a seal, and the limiting end face can be in contact with the lower end of the upper joint.

[0010] Optionally, the support core sleeve includes an upper half section, a middle section, and a lower half section. The upper half section, the middle section, and the lower half section are fixedly connected in sequence. The outer diameter of the middle section is greater than the outer diameter of the upper half section, the outer diameter of the upper half section is greater than the outer diameter of the lower half section, and the lower end of the lower half section extends into the lower joint and is threadedly connected to the lower joint;

[0011] A limiting platform is provided on the inner side of the support arm. The limiting platform can abut against the upper end of the middle section, and the lower end of the middle section can abut against the upper end of the piston sleeve on the pneumatic structure.

[0012] Optionally, sealing rings are provided between the upper joint and the outer cylinder, between the outer cylinder and the support arm, between the support arm and the support core sleeve, between the outer cylinder and the lower joint, and between the lower joint and the support core sleeve.

[0013] Optionally, the upper joint is threadedly connected to the outer cylinder, and the lower joint is threadedly connected to the outer cylinder.

[0014] Optionally, an internal thread for an oil pipe is provided on the inner wall of the upper end of the upper joint, and an external thread for an oil pipe is provided on the outer wall of the lower end of the lower joint.

[0015] The utility model provides a gas compression pressure-bearing positive well washing control valve, wherein the upper joint and the lower joint are respectively connected to two adjacent oil pipes, and the lower joint is close to the oil pump. When oil is produced, the oil pump is started, and the liquid is transported from the lower joint to the upper joint. At the same time, the pressure of the liquid on the support arm is less than the thrust of the air pressure structure on the support arm, and the support arm blocks the communication path between the annular opening and the flow hole, thereby preventing the liquid from entering the annulus of the oil casing, so that the liquid is transported upward along the oil pipe; when the positive well is washed, the oil pump is closed, and the well washing liquid (i.e., hot water) is transported from the upper joint to the lower joint, At the same time, the well washing fluid cannot pass through the oil pump, and the pressure of the well washing fluid on the support arm is greater than the thrust of the air pressure structure on the support arm. The support arm will move downward, and the gas in the air pressure structure will be compressed. Then the connecting path between the annular port and the flow hole will be connected, and the well washing fluid will enter the oil casing annulus from the connecting path and return to the ground to realize positive well washing. The gas compression pressure-bearing positive well washing control valve has a simple structure, can be kept closed during normal oil production, and can be easily opened during positive well washing, which solves the technical problem of the lack of a simple-structured well washing control valve for positive well washing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the blocking state of a gas compression pressure-bearing positive well-washing control valve provided by an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the connected state of a gas compression pressure-bearing positive well-washing control valve provided by an embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of a gas compression pressure-bearing positive well-washing control valve provided by an embodiment of the utility model, which lacks a lower joint and a gas pressure structure;

[0020] Figure 4 It is a structural schematic diagram of an upper joint of a gas compression pressure-bearing positive well-washing control valve provided by an embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of a support arm of a gas compression pressure-bearing positive well-washing control valve provided by an embodiment of the utility model;

[0022] Figure 6It is a schematic structural diagram of a support core sleeve of a gas compression pressure-bearing positive flushing well control valve provided by an embodiment of the present utility model.

[0023] In the figure, 1 is the upper joint; 11 is the second inclined structure; 12 is the internal thread of the tubing;

[0024] 2 is the outer cylinder; 21 is the circulation hole;

[0025] 3 is the support core sleeve; 31 is the upper half section; 32 is the middle section; 33 is the lower half section;

[0026] 4 is the lower joint; 41 is the external thread of the tubing;

[0027] 5 is the pneumatic structure; 51 is the cylinder block; 52 is the piston sleeve; 53 is the one-way inflation valve;

[0028] 6 is the support arm; 61 is the first inclined structure; 62 is the limiting end face; 63 is the hydraulic end face; 64 is the limiting platform;

[0029] 7 is the annular accommodation space;

[0030] 8 is the annular through port;

[0031] 9 is the seal. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present utility model without any creative efforts shall fall within the scope protected by the present utility model.

[0033] In the description of the present utility model, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] The utility model provides a gas compression pressure-bearing positive well washing control valve, comprising an upper joint 1, an outer tube 2, a support core sleeve 3, a lower joint 4, a gas pressure structure 5 and a support arm 6, wherein the two ends of the outer tube 2 are respectively sleeved on the upper joint 1 and the lower joint 4 and are sealed, the support core sleeve 3 is located inside the outer tube 2 and the interior of the lower joint 4 is connected to the lower end of the support core sleeve 3, an annular accommodation space 7 is formed between the outer tube 2, the support core sleeve 3 and the lower joint 4, the gas pressure structure 5 and the support arm 6 are both located in the annular accommodation space 7 and the gas pressure structure 5 is filled with gas, and the support arm 6 can move in the annular accommodation space 7;

[0036] There is an annular opening 8 between the lower end of the upper joint 1 and the support core sleeve 3, and a flow hole 21 is provided on the side wall of the outer tube 2. The annular opening 8 is connected to the flow hole 21 through the annular accommodating space 7, and the communication path between the annular opening 8 and the flow hole 21 can be blocked or connected when the support arm 6 moves. The utility model provides a gas compression pressure-bearing positive well washing control valve, in which the upper joint 1 and the lower joint 4 are respectively connected to two adjacent oil pipes, and the lower joint 4 is close to the oil pump. When oil is produced, the oil pump is started, and the liquid will be transported from the lower joint 4 to the upper joint 1. At the same time, the pressure of the liquid on the support arm 6 is less than the thrust of the air pressure structure 5 on the support arm 6. The support arm 6 will block the communication path between the annular opening 8 and the flow hole 21, thereby preventing the liquid from entering the oil casing annulus, so that the liquid is transported upward along the oil pipe; when the well is washed, the oil pump is closed, and the washing fluid (i.e., hot water) will flow from the upper joint 1 to the lower joint 4. The well washing fluid cannot pass through the oil pump, and the pressure of the well washing fluid on the support arm 6 is greater than the thrust of the air pressure structure 5 on the support arm 6. The support arm 6 will move downward, and the gas in the air pressure structure 5 will be compressed. Then the communication path between the annular port 8 and the flow hole 21 will be connected, and the well washing fluid will enter the oil casing annulus from the communication path and return to the ground to realize positive well washing. The gas compression pressure-bearing positive well washing control valve has a simple structure, can be kept closed during normal oil production, and can be easily opened during positive well washing, which solves the technical problem of the lack of a simple structure well washing control valve for positive well washing in the prior art.

[0037] As an alternative implementation, the pneumatic structure 5 includes a cylinder block 51 and a piston sleeve 52. Both the cylinder block 51 and the piston sleeve 52 are located in the annular accommodation space 7. One end of the piston sleeve 52 is located inside the cylinder block 51, and the other end of the piston sleeve 52 is connected to the support arm 6. The cylinder block 51 is filled with gas. When the pressure of the gas in the cylinder block 51 is greater than the pressure of the liquid on the support arm 6, the pressure of the gas will push the piston sleeve 52 upward, and then push the support arm 6 upward; when the pressure of the gas in the cylinder block 51 is less than the pressure of the washing fluid on the support arm 6, the pressure of the washing fluid will push the support arm 6 downward, and then push the piston sleeve 52 downward. As a result, the gas in the cylinder block 51 is compressed until the pressure generated by the compressed gas in the cylinder block 51 is the same as the pressure of the washing fluid, or when the limit platform 64 can abut against the upper end of the middle section 32, the support arm 6 will stop.

[0038] As an alternative implementation, a one-way inflation valve 53 is provided at the lower end of the cylinder block 51. The one-way inflation valve 53 is used to inflate the cylinder block 51, and after the cylinder block 51 is inflated, it is installed.

[0039] As an alternative implementation, a first inclined structure 61, a limit end face 62, and a hydraulic end face 63 are provided on the outer wall of the upper end of the support arm 6. The limit end face 62 is located below the first inclined structure 61, and the hydraulic end face 63 is located above the first inclined structure 61. A second inclined structure 11 is provided on the inner wall of the lower end of the upper joint 1. The first inclined structure 61 and the second inclined structure 11 can be sealed by a seal 9, and the limit end face 62 can contact the lower end of the upper joint 1. When the support arm 6 blocks the communication path between the annular through hole 8 and the flow hole 21, the first inclined structure 61 will contact the second inclined structure 11 and press the seal 9, so that the first inclined structure 61 and the second inclined structure 11 are sealed, and at the same time, the limit end face 62 will abut against the lower part of the first inclined structure 61, thereby restricting the support arm 6 from moving upward further. The hydraulic end face 63 is to increase the pressure contact area between the washing fluid and the support arm 6, so as to facilitate pushing the support arm 6 downward.

[0040] As an alternative implementation, the support core sleeve 3 includes an upper half section 31, a middle section 32, and a lower half section 33. The upper half section 31, the middle section 32, and the lower half section 33 are fixedly connected in sequence. The outer diameter of the middle section 32 is greater than the outer diameter of the upper half section 31, the outer diameter of the upper half section 31 is greater than the outer diameter of the lower half section 33. The lower end of the lower half section 33 extends into the lower joint 4 and the lower half section 33 is threadedly connected to the lower joint 4. The length of the lower half section 33 is greater than the length of the upper half section 31, and the length of the upper half section 31 is greater than the length of the middle section 32; the pneumatic structure 5 is located in the interval corresponding to the lower half section 33 and the outer cylinder 2.

[0041] A limiting platform 64 is provided on the inner side of the support arm 6. The limiting platform 64 can abut against the upper end of the middle section 32 to limit the further downward movement of the support arm 6. The lower end of the middle section 32 can abut against the upper end of the piston sleeve 52 on the pneumatic structure 5 to limit the further upward movement of the piston sleeve 52.

[0042] As an optional implementation manner, sealing rings are provided between the upper joint 1 and the outer cylinder 2, between the outer cylinder 2 and the support arm 6, between the support arm 6 and the support core sleeve 3, between the outer cylinder 2 and the lower joint 4, and between the lower joint 4 and the support core sleeve 3 for better sealing.

[0043] As an optional implementation manner, the upper joint 1 is threadedly connected to the outer cylinder 2, and the lower joint 4 is threadedly connected to the outer cylinder 2. An inner oil pipe thread 12 is provided on the inner wall of the upper end of the upper joint 1. The inner oil pipe thread 12 is for threaded connection with the outer end of the oil pipe. An outer oil pipe thread 41 is provided on the outer wall of the lower end of the lower joint 4. The outer oil pipe thread 41 is for threaded connection with the inner end of the oil pipe.

[0044] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. A gas compression pressure-bearing positive flushing well control valve, characterized in that, It includes an upper joint (1), an outer cylinder (2), a support core sleeve (3), a lower joint (4), a pneumatic structure (5) and a support arm (6). Among them, both ends of the outer cylinder (2) are respectively sleeved on the upper joint (1) and the lower joint (4) and are hermetically connected. The support core sleeve (3) is located inside the outer cylinder (2), and the inside of the lower joint (4) is connected to the lower end of the support core sleeve (3). An annular accommodation space (7) is formed among the outer cylinder (2), the support core sleeve (3) and the lower joint (4). Both the pneumatic structure (5) and the support arm (6) are located in the annular accommodation space (7), and the pneumatic structure (5) is filled with gas. The support arm (6) can move in the annular accommodation space (7); there is an annular through port (8) between the lower end of the upper joint (1) and the support core sleeve (3). A circulation hole (21) is provided on the side wall of the outer cylinder (2). The annular through port (8) is communicated with the circulation hole (21) through the annular accommodation space (7). The communication path between the annular through port (8) and the circulation hole (21) can be blocked or communicated under the movement of the support arm (6).

2. The gas compression pressure-bearing positive flushing well control valve according to claim 1, wherein The pneumatic structure (5) includes a cylinder block (51) and a piston sleeve (52). Both the cylinder block (51) and the piston sleeve (52) are located in the annular accommodation space (7). One end of the piston sleeve (52) is located inside the cylinder block (51), and the other end of the piston sleeve (52) is connected to the support arm (6). The cylinder block (51) is filled with gas.

3. The gas compression pressure-bearing positive flushing well control valve according to claim 2, characterized in that, A one-way inflation valve (53) is provided at the lower end of the cylinder block (51).

4. The gas compression pressure-bearing positive flushing well control valve according to claim 1, wherein, On the outer wall of the upper end of the support arm (6), there are a first inclined structure (61), a limiting end face (62) and a hydraulic end face (63). The limiting end face (62) is located below the first inclined structure (61), and the hydraulic end face (63) is located above the first inclined structure (61). A second inclined structure (11) is provided on the inner wall of the lower end of the upper joint (1). The first inclined structure (61) and the second inclined structure (11) can be sealed by a seal (9), and the limiting end face (62) can be in contact with the lower end of the upper joint (1).

5. The gas compression pressure-bearing normal flushing well control valve according to claim 1, characterized in that, The support core sleeve (3) includes an upper half section (31), a middle section (32) and a lower half section (33). The upper half section (31), the middle section (32) and the lower half section (33) are fixedly connected in sequence. The outer diameter of the middle section (32) is larger than the outer diameter of the upper half section (31), the outer diameter of the upper half section (31) is larger than the outer diameter of the lower half section (33), and the lower end of the lower half section (33) extends into the lower joint (4) and the lower half section (33) is threadedly connected to the lower joint (4); A limiting platform (64) is provided on the inner side of the support arm (6). The limiting platform (64) can abut against the upper end of the middle section (32), and the lower end of the middle section (32) can abut against the upper end of the piston sleeve (52) on the pneumatic structure (5).

6. The gas compression pressure-bearing positive flushing well control valve according to claim 1, wherein, Sealing rings are provided between the upper sub (1) and the outer cylinder (2), between the outer cylinder (2) and the support arm (6), between the support arm (6) and the support core sleeve (3), between the outer cylinder (2) and the lower sub (4), and between the lower sub (4) and the support core sleeve (3).

7. A gas compression pressure-bearing normal flushing well control valve according to claim 1, characterized in that, The upper sub (1) is threadedly connected to the outer cylinder (2), and the lower sub (4) is threadedly connected to the outer cylinder (2).

8. A gas compression and pressure-bearing normal flushing well control valve according to claim 1, characterized in that, An internal oil pipe thread (12) is provided on the inner wall of the upper end of the upper sub (1), and an external oil pipe thread (41) is provided on the outer wall of the lower end of the lower sub (4).

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