Ball seat one-way valve

Abstract

The utility model relates to a ball seat one-way valve which comprises an upper connector, a sleeve valve and a guide shoe, the outer wall of the upper end of the sleeve valve is fixedly connected with the inner wall of the lower end of the upper connector, and the outer wall of the lower end of the sleeve valve is fixedly connected with the inner wall of the upper end of the guide shoe. A ball seat and a push rod are arranged in the sleeve valve internal flow channel, the ball seat is fixed in the sleeve valve internal flow channel, and the push rod can axially move in the sleeve valve internal flow channel; a sealing ball for opening or closing an internal flow channel of the sleeve valve is arranged between the ball seat and the push rod; a spring is sleeved outside the push rod; the side wall of the sleeve valve is provided with a bypass hole communicated with an internal flow channel and the outside of the sleeve valve. A ball seat, a sealing ball and a push rod are arranged in a runner in the sleeve valve, and when the sealing ball is subjected to hydrostatic pressure, a spring is compressed to open the ball valve; the bypass can be opened only by the pressure of a liquid column in the oil pipe, and circulation is established; meanwhile, effective buoyancy is provided for the pipe column, and the risk that the pipe column encounters resistance in the open hole horizontal section tripping-in process is reduced.

Description

Technical Field

[0001] The utility model relates to a downhole tool for fracturing and reforming downhole reservoirs in oil and gas fields, in particular to a ball seat one-way valve in the process of lowering a horizontal well pipe column. Background Art

[0002] At present, the horizontal well segmented completion string is used in horizontal wells where the production well section needs long-term acid fracturing. The open hole horizontal well segmented fracturing is an effective technology for developing low-porosity, low-permeability, and tight gas reservoirs. The horizontal well string needs to ensure the unidirectional connection between the oil and casing during the string running process, and provide effective buoyancy for the string to reduce the risk of encountering resistance during the horizontal section of the open hole. Utility Model Content

[0003] The utility model provides a ball seat one-way valve, which can open the bypass only by the pressure of the liquid column in the oil pipe to establish circulation. At the same time, it provides effective buoyancy for the pipe string, reducing the risk of the pipe string encountering resistance during the process of running into the horizontal section of the open hole.

[0004] The technical solution adopted by the utility model is: a ball seat one-way valve, characterized in that: it comprises an upper joint, a sleeve valve and a guide shoe arranged from top to bottom, the outer wall of the upper end of the sleeve valve is fixedly connected to the inner wall of the lower end of the upper joint, and the outer wall of the lower end of the sleeve valve is fixedly connected to the inner wall of the upper end of the guide shoe; the internal flow channel of the sleeve valve is provided with a ball seat and a push rod, the ball seat is fixed in the internal flow channel of the sleeve valve, and the push rod can move axially in the internal flow channel of the sleeve valve; a sealing ball for opening or closing the internal flow channel of the sleeve valve is provided between the ball seat and the push rod, and a spring is provided on the outer sleeve of the push rod; the side wall of the sleeve valve is provided with a bypass hole connecting the internal flow channel of the sleeve valve with the outside.

[0005] Preferably, the oil pipe is pressurized, the sealing ball is under pressure, pushing the push rod downward, driving the spring to compress downward, the sealing ball is disengaged from the sealing surface of the ball seat, the internal flow channel of the sleeve valve is connected up and down, and the liquid flows out through the bypass hole on the sleeve valve.

[0006] Preferably, the upper end of the ball seat abuts against a stepped surface inside the upper joint, and the lower end abuts against a stepped surface at an upper end inside the sleeve valve.

[0007] Preferably, the upper end surface of the ball seat cooperates with the inclined surface of the internal step surface of the upper joint, and the lower end surface of the ball seat cooperates with the plane of the internal step surface of the sleeve valve, so that the ball seat is fixedly embedded in the internal flow channel of the sleeve valve.

[0008] Preferably, the outer wall of the upper end of the sleeve valve is threadedly connected to the inner wall of the lower end of the upper joint, and the outer wall of the lower end of the sleeve valve is threadedly connected to the inner wall of the upper end of the guide shoe.

[0009] Preferably, an O-ring is provided between the outer wall of the upper end of the sleeve valve and the inner wall of the lower end of the upper joint.

[0010] Preferably, an O-ring is provided between the inner wall of the sleeve valve and the outer wall of the ball seat.

[0011] Preferably, the outer wall of the upper end of the sleeve valve and the inner wall of the lower end of the upper joint are fastened by means of set screws, and the outer wall of the lower end of the sleeve valve and the inner wall of the upper end of the guide shoe are fastened by means of set screws.

[0012] Preferably, the bottom of the guide shoe is provided with a flow hole communicating with the internal flow channel of the sleeve valve.

[0013] Preferably, the sealing ball is a stainless steel ball.

[0014] The beneficial effects achieved by the utility model are as follows: by arranging a ball seat, a sealing ball and a push rod in the internal flow channel of the sleeve valve, when the sealing ball is subjected to hydrostatic pressure, a spring is compressed to open the ball valve; the utility model can open a bypass only by the pressure of the liquid column in the oil pipe to establish a circulation; at the same time, effective buoyancy is provided to the pipe string, reducing the risk of encountering resistance when the pipe string is lowered into the horizontal section of the open hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure: 1. upper joint; 2. sleeve valve; 3. guide shoe; 4. ball seat; 5. sealing ball; 6. push rod; 7. spring; 8. O-ring; 9. set screw; 10. flow hole; 11. bypass hole. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1 As shown, a ball seat one-way valve of the utility model comprises an upper joint 1, a sleeve valve 2 and a guide shoe 3 arranged from top to bottom, the upper outer wall of the sleeve valve 2 is threadedly connected to the lower inner wall of the upper joint 3, and the lower outer wall of the sleeve valve 2 is threadedly connected to the upper inner wall of the guide shoe 3; a ball seat 4 and a push rod 6 are provided in the internal flow channel of the sleeve valve 2, the ball seat 4 is fixed in the internal flow channel of the sleeve valve 2, and the push rod 6 can move axially in the internal flow channel of the sleeve valve 2; a sealing ball 5 for opening or closing the internal flow channel of the sleeve valve 2 is provided between the ball seat 4 and the push rod 6, and a spring 7 is provided on the outer sleeve of the push rod 6; a bypass hole 11 connecting the internal flow channel of the sleeve valve 2 with the outside is provided on the side wall of the sleeve valve 2.

[0019] In this embodiment, the upper end of the ball seat 4 abuts against the stepped surface inside the upper joint 1, and the lower end abuts against the stepped surface at the upper end inside the sleeve valve 2. The upper end surface of the ball seat 4 matches the inclined surface of the stepped surface inside the upper joint 1, and the lower end surface of the ball seat 4 matches the plane of the stepped surface inside the sleeve valve 2, so that the ball seat 4 is fixedly embedded in the internal flow channel of the sleeve valve 2.

[0020] In this embodiment, an O-type sealing ring 8 is provided between the outer wall of the upper end of the sleeve valve 2 and the inner wall of the lower end of the upper joint 1 , and an O-type sealing ring 8 is provided between the inner wall of the sleeve valve 2 and the outer wall of the ball seat 4 .

[0021] In this embodiment, the upper outer wall of the sleeve valve 2 and the lower inner wall of the upper joint 1 are fastened with a set screw 9 to form a threaded connection, and the lower outer wall of the sleeve valve 2 and the upper inner wall of the guide shoe 3 are fastened with a set screw 9 to form a threaded connection.

[0022] In this embodiment, a flow hole 10 communicating with the internal flow channel of the sleeve valve 2 is provided at the bottom of the guide shoe 3 to prevent foreign matter from clogging the spring 7 and causing the spring 7 to fail to function normally.

[0023] In this embodiment, the sealing ball 5 is a stainless steel ball.

[0024] The ball seat one-way valve of the utility model is opened only by the pressure in the oil pipe (the ball seat 4, the push rod 6, the sealing ball 5 and the spring 7 are combined to form the ball valve). If the pressure in the oil pipe is less than the force of the spring 7 on the push rod 6, the ball valve is closed.

[0025] When the horizontal well open hole segmented completion string is lowered: before the string is lowered, it is necessary to connect a pressure pump to test the one-way valve; when the tubing is pressurized, the sealing ball 5 is subjected to pressure, pushing the push rod 6, and the push rod 6 compresses the spring 7 downward, and the sealing ball 5 is disengaged from the sealing surface of the ball seat 4, providing a flow channel, and the liquid flows out through the bypass hole 11 on the sleeve valve 2; as the string is lowered deeper, the ball valve can be opened by the deadweight of the liquid in the tubing to establish a circulation; after the string is in place, the one-way valve can be opened by pressure to establish an oil-casing circulation, replace the well killing fluid, and protect the formation.

[0026] It should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the utility model is limited only by the scope of the claims.

[0027] Finally, it should be pointed out that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall be considered to belong to the protection scope of the present utility model.

Claims

1. A ball seat one-way valve, characterized in that: It comprises an upper joint, a sleeve valve and a guide shoe arranged from top to bottom, wherein the upper outer wall of the sleeve valve is fixedly connected to the lower inner wall of the upper joint, and the lower outer wall of the sleeve valve is fixedly connected to the upper inner wall of the guide shoe; a ball seat and a push rod are arranged in the internal flow passage of the sleeve valve, wherein the ball seat is fixed in the internal flow passage of the sleeve valve, and the push rod can move axially in the internal flow passage of the sleeve valve; a sealing ball for opening or closing the internal flow passage of the sleeve valve is arranged between the ball seat and the push rod, and a spring is arranged on the outer sleeve of the push rod; a bypass hole connecting the internal flow passage of the sleeve valve with the outside is arranged on the side wall of the sleeve valve.

2. The ball seat one-way valve according to claim 1, characterized in that: The oil pipe is pressurized, and the sealing ball is under pressure, which pushes the push rod downward, driving the spring to compress and move downward. The sealing ball is separated from the sealing surface of the ball seat, and the internal flow channel of the sleeve valve is connected from top to bottom, and the liquid flows out through the bypass port on the sleeve valve.

3. The ball seat one-way valve according to claim 1, characterized in that: The upper end of the ball seat abuts against the step surface inside the upper joint, and the lower end abuts against the step surface at the upper end inside the sleeve valve.

4. The ball seat one-way valve according to claim 3, characterized in that: The upper end surface of the ball seat matches with the inclined surface of the step surface inside the upper joint, and the lower end surface of the ball seat matches with the plane of the step surface inside the sleeve valve, so that the ball seat is fixedly embedded in the internal flow channel of the sleeve valve.

5. The ball seat one-way valve according to claim 1, characterized in that: The outer wall of the upper end of the sleeve valve is threadedly connected to the inner wall of the lower end of the upper joint, and the outer wall of the lower end of the sleeve valve is threadedly connected to the inner wall of the upper end of the guide shoe.

6. The ball seat one-way valve according to claim 1, characterized in that: An O-type sealing ring is arranged between the outer wall of the upper end of the sleeve valve and the inner wall of the lower end of the upper joint.

7. The ball seat one-way valve according to claim 1, characterized in that: An O-type sealing ring is arranged between the inner wall of the sleeve valve and the outer wall of the ball seat.

8. The ball seat one-way valve according to claim 1, characterized in that: The outer wall of the upper end of the sleeve valve is fastened to the inner wall of the lower end of the upper joint by means of a set screw, and the outer wall of the lower end of the sleeve valve is fastened to the inner wall of the upper end of the guide shoe by means of a set screw.

9. The ball seat one-way valve according to claim 1, characterized in that: The bottom of the guide shoe is provided with a flow hole which is communicated with the internal flow channel of the sleeve valve.

10. The ball seat one-way valve according to claim 1, characterized in that: The sealing ball is a stainless steel ball.

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