Switching valve for inverse well flushing operation of leakage well

Abstract

The switch valve comprises an upper connector, a shear pin and an outer cylinder assembly, the outer cylinder assembly is arranged on one side of the upper connector, the shear pin is arranged between the upper connector and the outer cylinder assembly, a sliding sleeve is arranged on the inner side of the upper connector, a light steel ball is fixed to the end head of one end of the inner side of the sliding sleeve, and the light steel ball is fixed to the end head of the other end of the inner side of the sliding sleeve. One end of the key is located on the sliding sleeve, the other end of the key is located on the long rail groove, the key on the sliding sleeve can slide downwards in the long rail groove to enter the short rail groove, a compressed spring is arranged on the portion, located on the inner side of the outer cylinder assembly, of one side of the sliding sleeve, and a bearing end cover and a thrust ball bearing are arranged between the sliding sleeve and the compressed spring. The whole structure is more compact and simple, later maintenance is facilitated, the well washing efficiency and effect are improved through a large-size well washing channel, and operation is convenient and easy.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil drilling and downhole operation equipment, specifically relating to a switching valve for backwashing operations in lost circulation wells. Background Technology

[0002] In oil drilling and downhole operations, well washing is a crucial step in ensuring smooth drilling and maintaining well productivity. Traditional backwash valves typically require a certain pressure in the annulus (i.e., a pressure difference with the tubing) to open. However, in some wells with casing leakage, severe leakage can prevent the establishment of annulus pressure, rendering conventional backwash valves ineffective. Utility Model Content

[0003] The purpose of this invention is to solve the above problems by providing a switching valve for backwashing operations in lost wells. The valve has a more compact and simple overall structure, is easy to operate and maintain, and has a large channel area, which improves the efficiency and effectiveness of well washing.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a switching valve for backwashing operations in lost circulation wells, comprising an upper connector, a shear pin, and an outer cylinder assembly. The outer cylinder assembly is provided on one side of the upper connector, and a shear pin is provided between the upper connector and the outer cylinder assembly. A sliding sleeve is provided on the inner side of the upper connector. A lightweight steel ball is fixed at one end of the inner side of the sliding sleeve, and a key is provided near the port at the other end. A compression spring is provided on one side of the sliding sleeve inside the outer cylinder assembly, and a bearing end cap and a thrust ball bearing are provided between the sliding sleeve and the compression spring.

[0005] Furthermore, the inner side of the outer cylinder assembly is provided with a long track groove and a short track groove.

[0006] Furthermore: the long track groove is located between the sliding sleeve and the outer cylinder assembly, one end of the key is located on the sliding sleeve, and the other end is located on the long track groove, and the key slides down the long track groove into the short track groove.

[0007] Furthermore, an O-ring is provided between the upper connector and the sliding sleeve.

[0008] Furthermore, the outer cylinder assembly is fixed to one end of the upper connector using a set screw and an O-ring.

[0009] Furthermore: the outer cylinder assembly is provided with an O-ring seal.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] The overall structure of this utility model is simple, and the design of the components is optimized, making the overall structure more compact, concise, and easy to maintain in the future.

[0012] Easy and simple to operate: the tool well washing channel switch is switched by pressurizing the tubing ball, which does not require complicated manual operation or mechanical devices and avoids the situation where the annulus leakage will cause the switch to fail to open or close.

[0013] Large channel area: The large-sized well-washing channel improves the efficiency and effectiveness of well washing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only for more clearly illustrating the technical solutions in the embodiments of this utility model or the prior art. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a cross-sectional view of the overall structure of this utility model in its initial state.

[0016] Figure 2 This is a cross-sectional view of the overall structure of this utility model in the well-washing state;

[0017] In the diagram: 1-Upper connector, 2-Sliding sleeve, 3-Shear pin, 4-Key, 5-Outer cylinder assembly, 6-Compression spring, 7-Bearing end cap, 8-O-ring seal one, 9-Set screw, 10-O-ring seal two, 11-O-ring seal three, 12-Light steel ball, 13-Thrust ball bearing. Detailed Implementation

[0018] To enable those skilled in the art to better understand and implement the technical solution of this utility model, the present utility model will be further described below with reference to specific embodiments. However, the embodiments described are only for illustration and are not intended to limit the present utility model.

[0019] like Figures 1-2 The aforementioned switch valve for backwashing operations in lost circulation wells comprises an upper connector 1, a sliding sleeve 2, a shear pin 3, a key, an outer cylinder assembly 5, a compression spring 6, and a thrust ball bearing 13. The upper connector 1 has an outer cylinder assembly 5 on one side, which is fixed to one end of the upper connector 1 by a set screw 9 and an O-ring seal 10. A shear pin 3 is provided between the upper connector 1 and the outer cylinder assembly 5. The inner side of the upper connector 1 is connected to the sliding sleeve 2 via an O-ring seal 8. A lightweight steel ball 12 is fixed at one end of the inner side of the sliding sleeve 2, and a key 4 is provided near the port at the other end. A compression spring 6 is provided on one side of the sliding sleeve 2 inside the outer cylinder assembly 5. An O-ring seal 11 is provided on the outer cylinder assembly 5. A bearing end cap 7 and a thrust ball bearing 13 are provided between the sliding sleeve 2 and the compression spring 6.

[0020] The inner side of the outer cylinder assembly 5 is provided with a long track groove and a short track groove. The long track groove and the short track groove are located between the sliding sleeve 2 and the outer cylinder assembly 5. One end of the key 4 is located on the sliding sleeve 2, and the other end is located on the long track groove. The key 4 can slide down the long track groove and enter the short track groove.

[0021] Preferably, a sealing ring is installed at the connection of the components to ensure the sealing of the switch valve during operation.

[0022] Working principle

[0023] When opening the switch valve for backwashing operation: pressurize by dropping a ball, the sliding sleeve goes down into the well, and the key on the sliding sleeve goes down the long track groove and then enters the short track groove. When the pressure is released, the sliding sleeve moves up under the action of the compression spring and enters the short track groove locking state. At this time, the sliding sleeve is in the open state and backwashing operation can be carried out.

[0024] When closing the switch valve: continue to pressurize by throwing the ball, the sliding sleeve and key move downwards, enter the long track groove along the short track groove, and when the pressure is released, the sliding sleeve moves upwards and returns to the closed state.

[0025] All content not described in detail in this utility model is prior art.

[0026] The above description is merely a preferred embodiment of this utility model and is not limited to the description in the specification and embodiments. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the claims of this utility model should be included within the scope of this utility model patent application.

Claims

1. A switch valve for lost circulation well reverse circulation operation, comprising an upper joint (1), a shear pin (3), an outer cylinder assembly (5), characterized in that: One side of the upper joint (1) is provided with an outer cylinder assembly (5), a shear pin (3) is arranged between the upper joint (1) and the outer cylinder assembly (5), the inner side of the upper joint (1) is provided with a sliding sleeve (2), the inner side of the sliding sleeve (2) is fixed with a light steel ball (12) at one end, the other end is provided with a key (4) near the port, the one side of the sliding sleeve (2) is provided with a compression spring (6) inside the outer cylinder assembly (5), a bearing end cover (7) and a thrust ball bearing (13) are arranged between the sliding sleeve (2) and the compression spring (6).

2. A switch valve for reverse circulation of a lost circulation well according to claim 1, characterized in that: The inner side of the outer cylinder assembly (5) is provided with a long track groove and a short track groove.

3. A switch valve for reverse circulation operations in a lost circulation well according to claim 2, characterized in that: The long track groove and the short track groove are located between the sliding sleeve (2) and the outer cylinder assembly (5), one end of the key (4) is located on the sliding sleeve (2), and the other end is located on the long track groove, the key (4) slides downward on the long track groove and enters the short track groove.

4. A switch valve for reverse circulation of a lost circulation well according to claim 1, characterized in that: An O-shaped sealing ring I (8) is arranged between the upper joint (1) and the sliding sleeve (2).

5. A switch valve for reverse circulation operations in a lost circulation well according to claim 1, characterized in that: One end of the outer cylinder assembly (5) and the upper joint (1) are fixed by a set screw (9) and an O-shaped sealing ring II (10).

6. A switch valve for reverse circulation operations in a lost circulation well according to claim 1, characterized in that: An O-shaped sealing ring III (11) is arranged on the outer cylinder assembly (5).

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