Controllable displacement flush valve

Abstract

The utility model discloses a controllable displacement flush valve which comprises a central pipe, an upper connector is sleeved on the periphery of the upper portion of the central pipe in a sliding mode, a circle of overflow nozzle is arranged on the periphery, close to the top, of the central pipe, a lower connector is sleeved on the periphery of the lower portion of the central pipe in a sliding mode, and a circle of jet nozzle is arranged on the periphery of the middle of the upper connector. The periphery of the lower part of the upper joint is sleeved with an outer cylinder through threads; the lower part of the outer cylinder is sleeved with the periphery of the upper part of the lower joint through threads; a convex edge is arranged on the periphery of the upper portion of the center pipe, a spring is arranged in the space between the outer cylinder and the center pipe, the upper end of the spring abuts against the lower end face of the convex edge, and the lower end of the spring abuts against the upper end face of the lower connector. The utility model belongs to the technical field of oil field accessory equipment, and solves the problems that a power drilling tool is hydraulically driven during milling in the prior art, the displacement is increased and limited, a power part is stalled, and the power part is damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil field auxiliary equipment and relates to a controllable displacement flushing valve. Background Art

[0002] Since horizontal wells have a large oil leakage area, the number of horizontal wells in various oil fields is constantly increasing. However, there are sand production problems to varying degrees during the production process. After sand production, the combined effects of wellbore sand, wellbore liquid, and wellbore environment cause cementation in the wellbore. The cementation has high hardness and a large area, which blocks the fluid production channel of the horizontal well and reduces production. However, measures such as tubing impact and chemical deblocking cannot remove the cementation.

[0003] At present, downhole power positive milling is basically adopted to remove cementing materials. During milling, the power drill is mostly hydraulically driven, so the interception effect on the liquid is obvious. Under normal working conditions, the displacement range is 500-700L / min. If the displacement is to be further increased, it will cause the power part to stall, damage the power part, and cause drilling. If the small displacement milling is used, most of the cementing materials after milling will remain in the horizontal section and the large inclination section, causing sand jam in the pipe column when the milling drill is started.

[0004] In order to increase the displacement during positive milling and better carry the cemented material out of the wellbore after milling, it is urgent to develop a new controllable displacement flushing valve to increase the displacement during positive milling, which will not affect the function of the power drilling tool and can also increase the positive flushing displacement. Utility Model Content

[0005] The utility model aims to provide a controllable displacement flushing valve, which solves the problem that the existing technology uses hydraulic drive for power drills during milling, and the displacement increase is limited, which will cause the power part to stall and damage the power part.

[0006] The technical solution adopted by the utility model is that the controllable displacement flushing valve comprises a central tube, an upper joint is slidingly sleeved on the upper periphery of the central tube, a circle of overflow nozzles is opened on the circumference of the central tube near the top, a lower joint is slidingly sleeved on the lower periphery of the central tube, and a circle of injection nozzles is opened on the middle circumference of the upper joint; an outer cylinder is threadedly sleeved on the lower periphery of the upper joint, and the lower part of the outer cylinder is threadedly sleeved on the upper periphery of the lower joint; a convex edge is arranged on the upper periphery of the central tube, a spring is arranged in the space between the outer cylinder and the central tube, the upper end of the spring is butt-jointed with the lower end face of the convex edge, and the lower end of the spring is butt-jointed with the upper end face of the lower joint.

[0007] The controllable displacement flushing valve of the utility model is also characterized in that:

[0008] The upper joint is a cylindrical hollow tube, and the upper inner surface of the upper joint is threaded for threaded connection with the pipe column above; the lower outer circumference of the upper joint is provided with a step, and the outer circumferential surface of the step is provided with an outer thread connected to the outer tube.

[0009] A sealing groove three is arranged at a position of the upper joint close to the lower port, and an O-type sealing ring three is installed thereon.

[0010] The center tube is a cylindrical hollow tube, and a cut-off nozzle is threadedly sleeved on the inner circle of the lower part of the center tube.

[0011] A sealing groove 1 and a sealing groove 2 are respectively formed at the upper and lower positions of a circle of overflow nozzles of the central tube, and an O-type sealing ring 1 and an O-type sealing ring 2 are respectively provided.

[0012] The intercepting nozzle is a cylindrical hollow tube, and a sealing groove four is opened on the outer circumference of the upper part of the intercepting nozzle, and an O-type sealing ring four is installed.

[0013] The outer tube is a cylindrical hollow tube with a radial pin hole near the upper and lower ports. A fixing pin 1 is installed in the upper pin hole, and the inner end of the fixing pin 1 is fixedly connected to the upper joint. A fixing pin 2 is installed in the lower pin hole. The inner circular surfaces of the upper and lower ports of the outer tube are respectively provided with internal threads.

[0014] The spring is a cylindrical spring with a hollow interior.

[0015] The lower joint is a cylindrical hollow tube with an outer circumference in the middle part. The outer circumference in the middle part of the lower joint is an external thread, which is threadedly connected to the outer tube. An axial limit groove is provided on the outer circumference in the middle and lower part of the lower joint, adjacent to the external thread. The inner end of the second fixing pin passes through the pin hole in the lower part of the outer tube and extends into the limit groove. The outer circumference in the lower part of the lower joint is an external thread.

[0016] The upper outer circumference of the lower joint is provided with its own sealing groove five, and an O-type sealing ring five is installed.

[0017] The beneficial effect of the utility model is that the liquid flows smoothly through the flushing valve to reach the power drill. When the liquid flow rate increases, the liquid flow is diverted through the bypass, which not only increases the forward flushing rate, but also avoids damage to the power drill caused by excessive displacement, significantly improves the forward flushing well displacement, and better washes solid particles out of the wellbore. The entire structure is mechanically designed, which improves the reliability and stability of the tool. It is particularly suitable for cleaning operations of small iron objects, scale, wax, etc. in the wellbore of oil fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the normal flow state of the device of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the emergency flushing state of the utility model device.

[0020] In the figure, 1, upper joint; 21, O-ring 1; 22, O-ring 2; 23, O-ring 3; 24, O-ring 4; 25, O-ring 5; 3, overflow nozzle; 4, injection nozzle; 51, fixing pin 1; 52, fixing pin 2; 6, center tube; 7, outer tube; 8, spring; 9, shut-off nozzle; 10, lower joint; 11, convex edge. DETAILED DESCRIPTION

[0021] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0022] The directions of “up, down, left, and right” mentioned in the following text are all intuitive descriptions of the corresponding drawings and are not intended to limit the installation positions of the components of the device structure. The actual installation positions shall be deduced accordingly.

[0023] Reference Figure 1 , Figure 2 The structure of the controllable displacement flushing valve of the utility model is as follows: it comprises a central tube 6, an upper joint 1 is slidably mounted on the upper periphery of the central tube 6, a lower joint 10 is slidably mounted on the lower periphery of the central tube 6, an outer tube 7 is threadedly mounted on the lower periphery of the upper joint 1, and the lower part of the outer tube 7 is threadedly mounted on the upper periphery of the lower joint 10, so as to ensure that the upper joint 1, the outer tube 7 and the lower joint 10 move up and down as a whole; a convex edge 11 is arranged on the upper periphery of the central tube 6, and the upper edge of the convex edge 11 is used as a limit block to limit the maximum falling position of the upper joint 1; a spring 8 is arranged in the space between the outer tube 7 and the central tube 6, the upper end of the spring 8 is in contact with the lower end face of the convex edge 11, and the lower end of the spring 8 is in contact with the upper end face of the lower joint 10; a shut-off nozzle 9 is threadedly mounted on the lower inner circle of the central tube 6.

[0024] The upper joint 1 is a cylindrical hollow tube, and the upper inner surface of the upper joint 1 is threaded for threaded connection with the pipe column above; a circle of evenly arranged oblique injection nozzles 4 is opened on the middle circumference of the upper joint 1; a step is provided on the lower outer circumference of the upper joint 1, and the outer circumferential surface of the step is provided with an outer thread connected to the outer tube 7; a sealing groove three is provided near the lower port of the upper joint 1, and an O-ring three 23 is installed to prevent external liquid from entering the interior of the central tube 6.

[0025] The center tube 6 is a cylindrical hollow tube. A circle of evenly arranged overflow nozzles 3 is opened on the circumference of the center tube 6 near the top. When the overflow nozzles 3 are connected to the injection nozzles 4 on the upper joint 1, the excessive liquid flow in the center tube 6 can be diverted. A convex edge 11 is set on the outer circumference of the middle part of the center tube 6, which serves as a limit for the upper joint 1 and a support point for the spring 8. The inner circle of the lower part of the center tube 6 is threadedly connected with intercepting nozzles 9 of different sizes. The combined effect of the displacement change and the spring 8 can drive the center tube 6 to move up and down and release the internal displacement. A sealing groove 1 and a sealing groove 2 are opened at the upper and lower positions of a circle of overflow nozzles 3 in the center tube 6, respectively, and O-type sealing rings 1 21 and 2 22 are respectively set, so that the overflow nozzle 3 will not leak along the inner wall of the center tube 6 and the upper joint 1.

[0026] The outer tube 7 is a cylindrical hollow tube with a radial pin hole near the upper and lower ports. A fixing pin 1 51 is installed in the upper pin hole. The inner end of the fixing pin 1 51 is fixedly connected to the upper joint 1. A fixing pin 2 52 is installed in the lower pin hole. The inner surfaces of the upper and lower ports of the outer tube 7 are respectively provided with internal threads for connecting the upper joint 1 and the lower joint 10.

[0027] The spring 8 is a cylindrical spring with a hollow interior. The material is not limited to metal and provides a rebound force for the central tube 6 .

[0028] The intercepting nozzle 9 is a cylindrical hollow tube, and is designed with different inner diameters (common inner diameter specifications are 25 / 30 / 32 / 34 / 36, in millimeters) for different liquid displacements, and is mainly used to protect the lower power drilling tools. The upper outer circumference of the intercepting nozzle 9 is provided with its own sealing groove 4, and an O-ring 4 24 is installed to achieve sealing of the contact surface between the intercepting nozzle 9 and the lower joint 10.

[0029] The lower joint 10 is a cylindrical hollow tube. The upper outer circumference of the lower joint 10 is provided with its own sealing groove 5, and an O-ring 5 25 is installed; the middle outer circumference of the lower joint 10 is an external thread, which is threadedly connected with the outer tube 7; the middle and lower outer circumference of the lower joint 10 is adjacent to the external thread and an axial limit groove is provided, and the inner end of the fixing pin 2 52 passes through the pin hole at the lower part of the outer tube 7 and extends into the limit groove, and can slide up and down (the lower joint 10 does not move); the lower outer circumference of the lower joint 10 is an external thread, which is threadedly connected with the pipe column below.

[0030] The working process of the utility model device is:

[0031] See Figure 1 , the device of the utility model is lowered to a predetermined position, and then liquid is injected into the pipe column from the ground. When the liquid passes through the inner cavity of the central tube 6 downward and passes through the intercepting nozzle 9, the inner diameter of the intercepting nozzle 9 becomes smaller, and the flow rate of the injected liquid does not change, resulting in the liquid above the intercepting nozzle 9 being pressed;

[0032] See Figure 2 The pressure is exerted on the upper end surface of the shutoff nozzle 9, which is fixedly connected with the center tube 6 as a whole. The convex edge 11 of the center tube 6 presses down the spring 8. When the downward pressure is large enough to overcome the elastic force of the spring 8, the spring 8 begins to contract, that is, the shutoff nozzle 9 drives the center tube 6 to move downward, so that a circle of overflow nozzles 3 around the center tube 6 is connected to a circle of injection nozzles 4 on the upper joint 1 in a one-to-one correspondence, so that the fluid pressure in the pipe column is released. As the displacement reaches a certain value, the pressure in the pipe column is always in a released state, thereby increasing the forward wash displacement.

[0033] Example 1

[0034] The structure of the controllable displacement flushing valve of the utility model comprises a central tube 6, an upper joint 1 is slidably mounted on the upper periphery of the central tube 6, a lower joint 10 is slidably mounted on the lower periphery of the central tube 6, an outer cylinder 7 is threadedly mounted on the lower periphery of the upper joint 1, and the lower part of the outer cylinder 7 is threadedly mounted on the upper periphery of the lower joint 10, so as to ensure that the upper joint 1, the outer cylinder 7 and the lower joint 10 move up and down as a whole; a convex edge 11 is arranged on the upper periphery of the central tube 6, and the upper edge of the convex edge 11 is used as a limit block to limit the maximum falling position of the upper joint 1; a spring 8 is arranged in the space between the outer cylinder 7 and the central tube 6, the upper end of the spring 8 is butt-jointed with the lower end face of the convex edge 11, and the lower end of the spring 8 is butt-jointed with the upper end face of the lower joint 10; a shut-off nozzle 9 is threadedly mounted on the lower inner circle of the central tube 6.

[0035] The upper joint 1 is a cylindrical hollow tube, and the upper inner surface of the upper joint 1 is threaded for threaded connection with the pipe column above; a circle of evenly arranged oblique injection nozzles 4 is opened on the middle circumference of the upper joint 1; a step is provided on the lower outer circumference of the upper joint 1, and the step surface is provided with an outer thread connected to the outer tube 7; a sealing groove three is provided near the lower port of the upper joint 1, and an O-ring three 23 is installed to prevent external liquid from entering the interior of the central tube 6.

[0036] Example 2

[0037] The structure of the controllable displacement flushing valve of the utility model comprises a central tube 6, an upper joint 1 is slidably mounted on the upper periphery of the central tube 6, a lower joint 10 is slidably mounted on the lower periphery of the central tube 6, an outer cylinder 7 is threadedly mounted on the lower periphery of the upper joint 1, and the lower part of the outer cylinder 7 is threadedly mounted on the upper periphery of the lower joint 10, so as to ensure that the upper joint 1, the outer cylinder 7 and the lower joint 10 move up and down as a whole; a convex edge 11 is arranged on the upper periphery of the central tube 6; a spring 8 is arranged in the space between the outer cylinder 7 and the central tube 6, the upper end of the spring 8 is butted against the lower end face of the convex edge 11, and the lower end of the spring 8 is butted against the upper end face of the lower joint 10; a shut-off nozzle 9 is threadedly mounted on the lower inner circle of the central tube 6.

[0038] The center tube 6 is a cylindrical hollow tube, and a circle of evenly arranged overflow nozzles 3 are opened on the circumference of the center tube 6 near the top; a convex edge 11 is arranged on the outer circumference of the middle part of the center tube 6, which serves as a limit for the upper joint 1 and a support point for the spring 8; a cut-off nozzle 9 is sleeved on the inner circle of the lower part of the center tube 6 by a threaded connection method, and a sealing groove 1 and a sealing groove 2 are respectively opened at the upper and lower positions of a circle of overflow nozzles 3 of the center tube 6, and O-type sealing ring 1 21 and O-type sealing ring 2 22 are respectively provided.

[0039] Example 3

[0040] The structure of the controllable displacement flushing valve of the utility model comprises a central tube 6, an upper joint 1 is slidably mounted on the upper periphery of the central tube 6, a lower joint 10 is slidably mounted on the lower periphery of the central tube 6, an outer cylinder 7 is threadedly mounted on the lower periphery of the upper joint 1, and the lower part of the outer cylinder 7 is threadedly mounted on the upper periphery of the lower joint 10, so as to ensure that the upper joint 1, the outer cylinder 7 and the lower joint 10 move up and down as a whole; a convex edge 11 is arranged on the upper periphery of the central tube 6; a spring 8 is arranged in the space between the outer cylinder 7 and the central tube 6, the upper end of the spring 8 is butted against the lower end face of the convex edge 11, and the lower end of the spring 8 is butted against the upper end face of the lower joint 10; a shut-off nozzle 9 is threadedly mounted on the lower inner circle of the central tube 6.

[0041] The outer tube 7 is a cylindrical hollow tube, with a radial pin hole near the upper and lower ports, a fixing pin 1 51 is installed in the upper pin hole, the inner end of the fixing pin 1 51 is fixedly connected to the upper joint 1, and a fixing pin 2 52 is installed in the lower pin hole; the inner surfaces of the upper and lower ports of the outer tube 7 are respectively provided with internal threads for connecting the upper joint 1 and the lower joint 10; the spring 8 is a cylindrical spring with a hollow interior. The shutoff nozzle 9 is a cylindrical hollow tube, and the upper outer circumference of the shutoff nozzle 9 is provided with its own sealing groove 4, and an O-ring 4 24 is installed.

[0042] Example 4

[0043] The structure of the controllable displacement flushing valve of the utility model comprises a central tube 6, an upper joint 1 is slidably mounted on the upper periphery of the central tube 6, a lower joint 10 is slidably mounted on the lower periphery of the central tube 6, an outer cylinder 7 is threadedly mounted on the lower periphery of the upper joint 1, and the lower part of the outer cylinder 7 is threadedly mounted on the upper periphery of the lower joint 10, so as to ensure that the upper joint 1, the outer cylinder 7 and the lower joint 10 move up and down as a whole; a convex edge 11 is arranged on the upper periphery of the central tube 6; a spring 8 is arranged in the space between the outer cylinder 7 and the central tube 6, the upper end of the spring 8 is butted against the lower end face of the convex edge 11, and the lower end of the spring 8 is butted against the upper end face of the lower joint 10; a shut-off nozzle 9 is threadedly mounted on the lower inner circle of the central tube 6.

[0044] The lower joint 10 is a cylindrical hollow tube. The upper outer circumference of the lower joint 10 is provided with its own sealing groove 5, and an O-ring 5 25 is installed; the middle outer circumference of the lower joint 10 is an external thread, which is threadedly connected with the outer tube 7; the middle and lower outer circumference of the lower joint 10 is adjacent to the external thread and an axial limit groove is provided, and the inner end of the fixing pin 2 52 can slide up and down in the limit groove with the outer tube 7 (the lower joint 10 does not move); the lower outer circumference of the lower joint 10 is an external thread, which is threadedly connected with the pipe column below.

[0045] It can be seen that in the structure of the present invention, the shut-off nozzle is installed at the lower part of the central tube, an overflow nozzle is opened at the front part of the central tube, and a spring force point is arranged on the outside of the central tube. When the central tube is pressurized, the spring is pushed downward, and the overflow nozzle communicates with the injection nozzle on the upper joint to play the role of diverting and protecting the lower power drilling tool, thereby increasing the forward washing displacement. If the displacement is reduced, the shut-off pressure in the controllable displacement flushing valve becomes smaller, and under the action of the spring elastic force, the central tube returns to its initial state, closing the overflow nozzle and the injection nozzle channel, thereby providing the required liquid displacement for the lower power drilling tool.

Claims

1. Controllable displacement flushing valve, characterized by: The invention comprises a central tube (6), an upper joint (1) is slidably mounted on the upper outer circumference of the central tube (6), a circle of overflow nozzles (3) is provided on the circumference of the central tube (6) near the top, a lower joint (10) is slidably mounted on the lower outer circumference of the central tube (6), and a circle of injection nozzles (4) is provided on the middle circumference of the upper joint (1); an outer cylinder (7) is threadedly mounted on the lower outer circumference of the upper joint (1), and the lower part of the outer cylinder (7) is threadedly mounted on the upper outer circumference of the lower joint (10); a convex edge (11) is provided on the upper outer circumference of the central tube (6), a spring (8) is provided in the space between the outer cylinder (7) and the central tube (6), the upper end of the spring (8) is in contact with the lower end surface of the convex edge (11), and the lower end of the spring (8) is in contact with the upper end surface of the lower joint (10).

2. The controllable displacement flushing valve according to claim 1, characterized in that: The upper joint (1) is a cylindrical hollow tube, and the upper inner surface of the upper joint (1) is threaded for threaded connection with the pipe column above; the lower outer circumference of the upper joint (1) is provided with a step, and the outer circumferential surface of the step is provided with an outer thread connected to the outer tube (7).

3. The controllable displacement flushing valve according to claim 2, characterized in that: The upper joint (1) is provided with a sealing groove three near the lower port, and is provided with an O-ring three (23).

4. The controllable displacement flushing valve according to claim 1, characterized in that: The central tube (6) is a cylindrical hollow tube, and a cut-off nozzle (9) is threadedly sleeved on the inner circle of the lower part of the central tube (6).

5. The controllable displacement flushing valve according to claim 4, characterized in that: A sealing groove 1 and a sealing groove 2 are respectively formed at the upper and lower positions of a circle of overflow nozzles (3) of the central tube (6), and O-type sealing ring 1 (21) and O-type sealing ring 2 (22) are respectively provided.

6. The controllable displacement flushing valve according to claim 4, characterized in that: The intercepting nozzle (9) is a cylindrical hollow tube. The upper outer circumference of the intercepting nozzle (9) is provided with its own sealing groove (4) and is provided with an O-type sealing ring (24).

7. The controllable displacement flushing valve according to claim 1, characterized in that: The outer cylinder (7) is a cylindrical hollow tube with a radial pin hole formed near the upper and lower ports. A fixing pin 1 (51) is installed in the upper pin hole. The inner end of the fixing pin 1 (51) is fixedly connected to the upper joint (1). A fixing pin 2 (52) is installed in the lower pin hole. The inner surfaces of the upper and lower ports of the outer cylinder (7) are respectively provided with internal threads.

8. The controllable displacement flushing valve according to claim 1, characterized in that: The spring (8) is a cylindrical spring with a hollow interior.

9. The controllable displacement flushing valve according to claim 1, characterized in that: The lower joint (10) is a cylindrical hollow tube. The middle outer circumference of the lower joint (10) is an external thread, which is threadedly connected to the outer tube (7). An axial limit groove is provided on the middle and lower outer circumference of the lower joint (10) adjacent to the external thread, and the inner end of the second fixing pin (52) passes through the pin hole at the lower part of the outer tube (7) and extends into the limit groove. The lower outer circumference of the lower joint (10) is an external thread.

10. The controllable displacement flushing valve according to claim 9, characterized in that: The upper outer circumference of the lower joint (10) is provided with its own sealing groove (5) and is provided with an O-type sealing ring (25).

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