CN216642062U

CN216642062U - Soluble ball type positive circulation well washing device

Info

Publication number: CN216642062U
Application number: CN202121193968.2U
Authority: CN
Inventors: 吕树阁; 刘玉珠; 刘希民
Original assignee: PUYANG EVEREST PETROLEUM MACHINERY CO LTD
Current assignee: PUYANG EVEREST PETROLEUM MACHINERY CO LTD
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-05-31
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a soluble ball type positive circulation well washing device which comprises an upper joint, an outer barrel, an upper central pipe, a soluble ball, a positive washing piston, a compression return spring, a return piston, a lower central pipe and a lower joint, wherein the upper joint is connected with the upper central pipe through a pipeline; pistons are arranged at the bottom ends of the outer barrel and the upper central pipe; a compression return spring is arranged between the outer cylinder and the lower central tube; the bottom end of the compression return spring is provided with a power-assisted return piston; the upper central pipe is arranged on a valve seat of the well washing piston; an upper joint is arranged above the well washing piston; a lower joint is arranged below the outer barrel; one end of the lower central tube, which is close to the return piston, is provided with an inner central tube liquid inlet; the outer barrel is provided with the outer barrel liquid outlet at the upper half part, and the outer barrel liquid outlet valve is simple in structure, convenient to operate, low in manufacturing cost, capable of being opened and closed for multiple times, long in service cycle and suitable for popularization and use.

Description

Soluble ball type positive circulation well washing device

Technical Field

The utility model relates to the technical field of oil field downhole tools, in particular to a soluble ball type positive circulation well washing device.

Background

In the water injection development process of most oil fields in China, due to the fact that the number of separate injection wells is gradually increased, the problems that impurities in injected water are precipitated to block a water injection channel, sand is produced from a stratum, scaling in a dead water area is serious and the like are solved, and precipitates in the wells need to be regularly washed out of a shaft in the management process of the water injection wells. At present, a well washing channel is mainly established in a gap between a central pipe of a packer and an outer barrel of a water injection well, and the well washing channel is limited by a gap space and cannot effectively remove sediments with large particle sizes.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a soluble ball type positive circulation well washing device which has simple structure, low manufacturing cost, quick response, simple operation and easy maintenance and is used for overcoming the defects in the prior art

In order to achieve the purpose, the utility model provides the technical scheme that:

a soluble ball type positive circulation well washing device comprises an outer cylinder, a lower central pipe and an upper central pipe; a return piston is arranged at the bottom ends of the outer barrel and the lower central pipe; a compression return spring is arranged between the outer cylinder and the lower central tube; a well washing valve is arranged on the compression return spring; the upper central pipe is arranged on a valve seat of the well washing valve; an upper joint is arranged above the well washing valve; a lower joint is arranged below the outer barrel; one end of the upper central pipe close to the well washing valve seat is provided with a lower central pipe liquid inlet; the upper half part of the outer cylinder is provided with an outer cylinder liquid outlet; a valve seat of the well washing valve is also provided with a well washing piston; the well washing piston and the well washing valve seat are integrally arranged.

Further, the well washing valve seat is in a boss shape.

Further, when the positive circulation well washing valve is used, the positive circulation well washing valve also comprises a sealing ball; the sealing ball is clamped on the valve seat of the well washing valve.

Furthermore, the outer cylinder, the lower central tube and the return piston are in threaded connection; a first sealing cavity is arranged on the outer wall of the return piston, which is in contact with the outer cylinder; and a second sealing cavity is arranged on the outer wall of the return piston, which is in contact with the lower central tube.

Further, the lower end of the upper joint is connected with the outer cylinder and the upper central pipe through screw threads; and a third sealing cavity and a fourth sealing cavity are respectively arranged at the joint of the upper joint screw thread and the outer barrel as well as the upper central pipe.

Further, the upper end of the lower joint is connected with the outer cylinder and the lower central pipe through screw threads; and a fifth sealing cavity and a sixth sealing cavity are respectively arranged at the joint of the lower joint screw thread and the outer barrel as well as the lower central tube.

Furthermore, a seventh sealing cavity is arranged at the joint of the well flushing valve and the lower central pipe.

Furthermore, the contact position of the well washing valve and the upper central pipe is provided with a plurality of eighth sealing cavities, and the sealing ball is a soluble ball.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model has simple structure, convenient operation, low manufacturing cost, long service cycle and suitability for popularization and use, and can be opened and closed for multiple times.

Drawings

FIG. 1 is a schematic structural diagram of a soluble ball type positive circulation well-flushing device of the present invention.

Detailed Description

As shown in fig. 1, a soluble ball type positive circulation well washing device comprises an outer cylinder 5, a lower central pipe 8 and an upper central pipe 3; the bottom ends of the outer barrel 5 and the lower central tube 8 are provided with return pistons 18; a compression return spring 9 is arranged between the outer cylinder 5 and the lower central tube 8; a well washing valve 7 is arranged on the compression return spring 9; the upper central pipe 3 is arranged on a valve seat of the well washing valve 7; an upper joint 1 is arranged above the well flushing valve 7; a lower joint 13 is arranged below the outer cylinder 5; a lower central pipe liquid inlet 19 is formed in one end, close to the valve seat of the well flushing valve 7, of the upper central pipe 3; an outer barrel liquid outlet 20 is formed in the upper half part of the outer barrel 5; a valve seat of the well washing valve 7 is also provided with a well washing piston 21; the well washing piston and the valve seat of the well washing valve 7 are integrally arranged.

Further, the valve seat of the well washing valve 7 is in a boss shape.

Further, when in use, the positive circulation well washing valve also comprises a sealing ball 15; the sealing ball 15 is clamped on the valve seat of the well washing valve 7.

Further, the outer cylinder 5, the lower central tube 8 and the return piston 18 are all in threaded connection; a first sealing cavity 11 is arranged on the outer wall of the return piston 18, which is in contact with the outer cylinder 5; and a second sealing cavity 10 is arranged on the outer wall of the return piston 18, which is in contact with the lower central tube 8.

Further, the lower end of the upper joint 1 is connected with an outer cylinder 5 and an upper central tube 3 through screw threads; and a third sealing cavity 2 and a fourth sealing cavity 14 are respectively arranged at the connection part of the upper joint 1 thread and the outer cylinder 5 and the upper central tube 3.

Further, the upper end of the lower joint 13 is connected with the outer cylinder 5 and the lower central tube 8 through screw threads; and a fifth sealing cavity 17 and a sixth sealing cavity 12 are respectively arranged at the connection part of the lower joint 13 and the outer cylinder 5 and the lower central tube 8.

Further, a seventh sealed cavity 16 is arranged at the joint of the well washing valve 7 and the lower central pipe 8.

Furthermore, a plurality of eighth sealing cavities 6 are arranged at the contact position of the well washing valve 7 and the upper central pipe 3

Further, the sealing ball 15 is a soluble ball.

When the soluble ball type positive circulation well washing device is used, the sealing ball 15 is firstly thrown into the oil pipe, falls into the valve seat of the well washing valve 7, seals the lower central pipeline, applies positive pressure to the pipe to push the well washing valve to move downwards, enables the liquid inlet of the upper central pipe to be communicated with the appearance liquid outlet, realizes positive washing, cancels the positive pressure after well washing is finished, resets the well washing valve under the restoring force of the compressed return spring, and completely seals a well washing channel.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A soluble ball type positive circulation well washing device is characterized by comprising an upper joint (1), an outer barrel (5), a lower central pipe (8) and an upper central pipe (3); the bottom ends of the outer cylinder (5) and the lower central tube (8) are provided with return pistons (18); a compression return spring (9) is arranged between the outer cylinder (5) and the lower central tube (8); a well washing valve (7) is arranged on the compression return spring (9); the upper central pipe (3) is arranged on a valve seat of the well washing valve (7); an upper joint (1) is arranged above the well washing valve (7); a lower joint (13) is arranged below the outer cylinder (5); a lower central pipe liquid inlet (19) is formed in one end, close to the valve seat of the well washing valve (7), of the upper central pipe (3); an outer barrel liquid outlet (20) is formed in the upper half part of the outer barrel (5); a valve seat of the well washing valve (7) is also provided with a well washing piston (21); the well washing piston and the valve seat of the well washing valve (7) are integrally arranged.

2. A soluble ball positive circulation well-flushing device according to claim 1, characterized in that the well-flushing valve (7) valve seat is boss-like.

3. A soluble ball positive-circulation well-flushing device according to claim 1 or 2, characterized in that the positive-circulation well-flushing valve, when in use, further comprises a sealing ball (15); the sealing ball (15) is clamped on the valve seat of the well washing valve (7).

4. A soluble ball type positive circulation well washing device according to claim 3, characterized in that the outer cylinder (5), the lower central tube (8) and the return piston (18) are all in threaded connection; a first sealing cavity (11) is arranged on the outer wall of the return piston (18) which is in contact with the outer cylinder (5); and a second sealing cavity (10) is arranged on the outer wall of the return piston (18) which is in contact with the lower central tube (8).

5. A soluble ball positive circulation well-flushing device according to claim 1, 2 or 4, characterized in that the lower end of the upper joint (1) is screwed with the outer cylinder (5) and the upper central pipe (3); and a third sealing cavity (2) and a fourth sealing cavity (14) are respectively arranged at the joint of the upper joint (1) screw thread and the outer cylinder (5) and the upper central tube (3).

6. A soluble ball positive circulation well-flushing device according to claim 5, characterized in that the upper end of the lower joint (13) is screwed with the outer cylinder (5) and the lower central pipe (8); and a fifth sealing cavity (17) and a sixth sealing cavity (12) are respectively arranged at the connection positions of the lower joint (13) and the outer cylinder (5) and the lower central tube (8) through screw threads.

7. A soluble ball positive circulation well-flushing device according to claim 6, characterized in that where the well-flushing valve (7) is connected to the lower central tube (8), a seventh sealed chamber (16) is provided.

8. A soluble ball positive circulation well-flushing device according to claim 7, characterized in that a plurality of eighth sealed chambers (6) are provided where the well-flushing valve (7) meets the upper base pipe (3).

9. A soluble ball positive circulation well-flushing device according to claim 4, characterized in that the sealing ball (15) is a soluble ball.