A controllable circulation valve

Abstract

The application discloses a controllable circulation valve, which comprises a sliding sleeve and a hydraulic reset mechanism arranged in the sliding sleeve. The hydraulic reset mechanism slides up and down in the sliding sleeve by using pressure difference, so that the circulation valve is started and stopped. The hydraulic reset mechanism of the controllable circulation valve is repeatedly designed, hydraulic conversion can be realized, and reliable reversing can be ensured. At the same time, the sliding sleeve tool switch can be controlled by throwing a soluble ball, and the soluble ball can be repeatedly used, so that multi-cycle measure operation of one pipe column can be realized, operation cost is reduced, and the soluble ball is used as the control ball. After the soluble ball is melted, the central passage is always smooth.

Description

Technical Field

[0001] This invention relates to the field of downhole tools for oil and gas fields, and particularly to a controllable circulation valve. Background Technology

[0002] In oilfield production applications, traditional sliding sleeve switches are mainly opened and closed using specialized switching tools lowered via wireline operations, as well as hydraulically controlled sliding sleeve switches. However, in practical applications, many problems arise, as traditional tools are either unsuitable or present difficulties in application. For example, in highly deviated wells and ultra-deep wells, wireline operation for opening and closing sliding sleeves is not feasible. Hydraulically controlled sliding sleeves can only be used once; subsequent water injection or other operations require rework, resulting in repetitive work. Furthermore, the deployed isolation steel balls interfere with the testing processes of subsequent instruments.

[0003] The Chinese invention patent "Integrated Construction Tool and Construction Method for Layered Fracturing, Testing and Mining" (patent number CN111734378A) published on July 15, 2020, discloses a switchable sliding sleeve that uses a spring reset mechanism. This mechanism has the risk that the reset force is insufficient to push the sliding sleeve to change direction, which may cause the sliding sleeve to fail to change direction effectively and affect the construction. Summary of the Invention

[0004] The purpose of this invention is to provide a controllable circulation valve.

[0005] Therefore, the technical solution of the present invention is as follows:

[0006] The present invention provides a controllable circulation valve, characterized in that it includes a sliding sleeve and a sliding mechanism disposed inside the sliding sleeve, wherein the sliding mechanism slides up and down inside the sliding sleeve using a pressure difference to realize the start and stop of the circulation valve;

[0007] The sliding sleeve includes an upper connector, a connecting cylinder, an upper valve seat connector, an upper valve seat, a liquid outlet outer cylinder, a positioning pin, a positioning sleeve, and a lower connector; the upper connector, connecting cylinder, liquid outlet outer cylinder, and lower connector are sequentially threaded together; the upper valve seat connector is disposed inside the connecting cylinder, and its upper and lower ends are respectively connected to the upper connector and the upper valve seat via threads; the positioning sleeve is nested inside the liquid outlet outer cylinder and is tightened and fixed by the lower connector; wherein, the connecting cylinder has an upper connecting hole and a lower connecting hole; the upper valve seat connector has a central connecting hole; and the liquid outlet outer cylinder has a liquid outlet outer cylinder hole and a positioning reference hole;

[0008] The sliding mechanism includes an upper reversing piston body, a reversing piston conversion body, a lower reversing piston body, a liquid outlet inner cylinder, a lower valve seat, and a lower valve seat claw. The upper end face of the lower reversing piston body faces the upper valve seat. The lower reversing piston body, the liquid outlet inner cylinder, and the lower valve seat claw are sequentially threaded together. The lower valve seat is nested inside the liquid outlet inner cylinder and is pressed and fixed by the lower valve seat claw. The upper reversing piston body and the reversing piston conversion body are threaded together. The upper reversing piston body is nested between the upper valve seat connecting body and the connecting cylinder. The reversing piston conversion body is nested between the lower reversing piston body and the connecting cylinder. The liquid outlet inner cylinder has a liquid outlet inner cylinder hole.

[0009] Furthermore, the liquid inner cylinder has a uniformly distributed porous structure, typically with 4, 5, or 6 holes.

[0010] Furthermore, the liquid outlet outer cylinder hole and the positioning reference hole are on the same cross-section. The liquid outlet outer cylinder hole is uniformly distributed with multiple holes, generally 4, 5, or 6 holes, and the number is the same as that of the liquid outlet inner cylinder hole.

[0011] Furthermore, the lower end of the lower valve seat claw is evenly cut into 6-8 sections, forming a cantilever beam shape.

[0012] Furthermore, the connector has a tapered neck in the middle. When the lower valve seat claw is at the upper end, the split claw of the lower valve seat claw abuts against the neck step to fix the lower valve seat claw and prevent it from moving.

[0013] Compared with existing technologies, the hydraulic reset mechanism of this controllable circulating valve's repeatable circulation valve design enables hydraulic switching. The hydraulic force at 1MPa is 5000N, and during operation, it can achieve a working pressure of 30MPa, with a force reaching 150000N, ensuring reliable reversal. At the same time, the sliding sleeve tool can be controlled by dropping a soluble ball and can be reused, enabling multiple rounds of operation on a single pipe string, reducing construction costs. The control ball is a soluble ball, which ensures that the central channel remains unobstructed after melting. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the controllable circulation valve in the closed state.

[0015] Figure 2 This is a schematic diagram showing the open state of the controllable circulation valve.

[0016] Figure 3 This is the front view of the positioning sleeve.

[0017] Figure 4 This is a cross-sectional view of the lower valve seat claw. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0019] Unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to, and many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0020] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms, encompassing any or all possible combinations of one or more associated listed items.

[0021] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0022] This invention provides a controllable circulation valve, such as Figure 1-4 As shown, it includes a sliding sleeve and a hydraulic reset mechanism disposed inside the sliding sleeve. The hydraulic reset mechanism slides up and down inside the sliding sleeve using the pressure difference to realize the start and stop of the circulation valve.

[0023] The sliding sleeve includes an upper connector 1, a connecting cylinder 2, an upper valve seat connector 3, an upper valve seat 4, a liquid outlet outer cylinder 11, a positioning pin 12, a positioning sleeve 13, and a lower connector 14; the upper connector 1, the connecting cylinder 2, the liquid outlet outer cylinder 11, and the lower connector 14 are sequentially threaded together; the upper valve seat connector 3 is disposed inside the connecting cylinder 2, and its upper and lower ends are respectively connected to the upper connector 1 and the upper valve seat 4 by threads; the positioning sleeve 13 is nested inside the liquid outlet outer cylinder 11 and is tightened and fixed by the lower connector 1; wherein, the connecting cylinder 2 has an upper connecting hole 201 and a lower connecting hole 202; the upper valve seat connector 3 has a central connecting hole 301; the liquid outlet outer cylinder 11 has a liquid outlet outer cylinder hole 1101 and a positioning reference hole 1102;

[0024] The hydraulic reset mechanism includes an upper reversing piston body 5, a reversing piston conversion body 7, a lower reversing piston body 6, a liquid outlet inner cylinder 8, a lower valve seat 9, and a lower valve seat claw 10. The upper end face of the lower reversing piston body 6 faces the upper valve seat 4. The lower reversing piston body 6, the liquid outlet inner cylinder 8, and the lower valve seat claw 10 are sequentially threaded together. The lower valve seat 9 is nested inside the liquid outlet inner cylinder 8 and is pressed and fixed by the lower valve seat claw 10. The upper reversing piston body 5 and the reversing piston conversion body 7 are threaded together. The upper reversing piston body 5 is nested between the upper valve seat connecting body 3 and the connecting cylinder 2. The reversing piston conversion body 7 is nested between the lower reversing piston body 6 and the connecting cylinder 2.

[0025] The inner liquid outlet cylinder 8 is designed with liquid outlet holes 801, which are uniformly distributed in multiple holes, typically 4, 5, or 6 holes; the outer liquid outlet cylinder 11 is designed with an outer liquid outlet hole 1101 and a positioning reference hole 1102, both holes being on the same cross-section. The outer liquid outlet hole 1101 is uniformly distributed in multiple holes, typically 4, 5, or 6 holes, and the number is the same as the number of holes 801 in the inner liquid outlet cylinder; Figure 4 As shown, the lower valve seat claw 10 is evenly cut into 6-8 sections at its lower end, forming a cantilever beam shape; as Figure 3 As shown, the positioning sleeve 13 is designed with an inner boss, and a threaded hole is designed here.

[0026] The lower connector 14 has a tapered neck in the middle. When the lower valve seat claw 10 is at the upper end, the split claw of the lower valve seat claw 10 abuts against the neck step, fixing the lower valve seat claw 10 and preventing it from moving. When the external force is greater than the cantilever beam force of the split claw of the lower valve seat claw 10, the split claw of the lower valve seat claw 10 retracts and moves downward until the split claw of the lower valve seat claw 10 enters the larger inner diameter of the other end of the lower connector 14, fixing the lower valve seat claw 10 and preventing it from moving freely.

[0027] It should be further explained that during assembly, the center line of the liquid outlet inner cylinder hole 801 and the cut-off part of the lower valve seat claw 10 are on the same cross section and fixed.

[0028] After assembly, the liquid outlet inner cylinder hole 801, the liquid outlet outer cylinder hole 1101, the positioning reference hole 1102, the protruding end of the positioning sleeve 13, and the cut-off part of the lower valve seat claw 10 are on the same cross-section, ensuring that the center lines of the liquid outlet inner cylinder hole 801 and the liquid outlet outer cylinder hole 1101 coincide and will not be misaligned.

[0029] The working principle of the controllable circulation valve provided by this invention is as follows:

[0030] When the tool is in such a state Figure 1 In the state where the tool is in a state where the inner and outer parts are not connected, when the small soluble ball 16 is put in and the inner tube of the tool is pressurized, the small soluble ball 16, the lower body 6 of the reversing piston, the liquid outlet inner cylinder 8, the lower valve seat 9, and the lower valve seat claw 10 move downward as a whole until the liquid outlet inner cylinder hole 801 coincides with the liquid outlet outer cylinder hole 1101.

[0031] When the tool is in such a state Figure 2 When the tool is in the state of internal and external communication, the large soluble ball 15 is inserted. When the inner tube of the tool is pressurized, the channel below the upper valve seat 4 is isolated by the large soluble ball 15. The hydraulic pressure enters the closed space formed by the upper valve seat connecting body 3 and the upper body of the reversing piston 5 through the central connecting hole 301, pushing the upper body of the reversing piston 5 and the reversing piston conversion body 7 to move upward. The liquid in the closed space is discharged to the oil jacket annulus through 201 to compensate for the increased space caused by the liquid entering the upper body of the reversing piston from the oil jacket annulus. The upper body of the reversing piston 5 and the reversing piston conversion body 7 drive the lower body of the reversing piston 6, the liquid outlet inner cylinder 8, the lower valve seat 9, and the lower valve seat claw 10 to move upward as a whole until the liquid outlet inner cylinder hole 801 and the liquid outlet outer cylinder hole 1101 are no longer in the overlapping state, until the inner and outer channels of the tool are closed.

[0032] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the embodiments of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of the embodiments of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A controllable circulation valve, characterized in that, It includes a sliding sleeve and a hydraulic reset mechanism disposed inside the sliding sleeve. The hydraulic reset mechanism slides up and down inside the sliding sleeve using a pressure difference to realize the start and stop of the circulation valve. The sliding sleeve includes an upper connector, a connecting cylinder, an upper valve seat connector, an upper valve seat, a liquid outlet outer cylinder, a positioning pin, a positioning sleeve, and a lower connector; the upper connector, connecting cylinder, liquid outlet outer cylinder, and lower connector are sequentially threaded together; the upper valve seat connector is disposed inside the connecting cylinder, and its upper and lower ends are respectively connected to the upper connector and the upper valve seat via threads; the positioning sleeve is nested inside the liquid outlet outer cylinder and is tightened and fixed by the lower connector; wherein, the connecting cylinder has an upper connecting hole and a lower connecting hole; the upper valve seat connector has a central connecting hole; and the liquid outlet outer cylinder has a liquid outlet outer cylinder hole and a positioning reference hole; The hydraulic reset mechanism includes an upper reversing piston body, a reversing piston conversion body, a lower reversing piston body, a liquid outlet inner cylinder, a lower valve seat, and a lower valve seat claw. The upper end face of the lower reversing piston body faces the upper valve seat. The lower reversing piston body, the liquid outlet inner cylinder, and the lower valve seat claw are sequentially threaded together. The lower valve seat is nested inside the liquid outlet inner cylinder and is secured by the lower valve seat claw. The upper reversing piston body and the reversing piston conversion body are threaded together. The upper reversing piston body is nested between the upper valve seat connecting body and the connecting cylinder. The reversing piston conversion body is nested between the lower reversing piston body and the connecting cylinder. The liquid outlet inner cylinder has a liquid outlet inner cylinder hole. When the tool is in a state where the inner and outer parts are not connected, a small soluble ball is inserted. When the inner tube of the tool is pressurized, the small soluble ball, the lower body of the reversing piston, the liquid outlet inner cylinder, the lower valve seat, and the lower valve seat claw move downward as a whole until the liquid outlet inner cylinder hole coincides with the liquid outlet outer cylinder hole. When the tool is in the internal and external communication state, a large soluble ball is inserted. When the tool's inner tube is pressurized, the channel below the upper valve seat is isolated by the large soluble ball. Hydraulic pressure enters the closed space formed by the upper valve seat connector and the upper body of the reversing piston through the central connecting hole, pushing the upper body of the reversing piston and the reversing piston conversion body to move upward, which in turn drives the lower body of the reversing piston, the liquid outlet inner cylinder, the lower valve seat, and the lower valve seat claw to move upward as a whole until the liquid outlet inner cylinder hole and the liquid outlet outer cylinder hole are no longer in the same state, until the tool's internal and external channels are closed.

2. The controllable circulation valve according to claim 1, characterized in that, The liquid inner cylinder has a uniformly distributed porous structure.

3. The controllable circulation valve according to claim 2, characterized in that, The liquid outlet outer cylinder hole and the positioning reference hole are on the same cross-section. The liquid outlet outer cylinder hole is uniformly distributed and has the same number as the liquid outlet inner cylinder hole.

4. The controllable circulation valve according to claim 3, characterized in that, The lower valve seat claw is evenly cut into 6-8 sections at its lower end, forming a cantilever beam shape.

5. The controllable circulation valve according to claim 4, characterized in that, The lower connector has a tapered neck in the middle. When the lower valve seat claw is at the upper end, the split claw of the lower valve seat claw abuts against the neck step to fix the lower valve seat claw and prevent it from moving.

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