Underground self-moving tool

Abstract

An underground self-moving tool comprises an upper connecting pipe, a telescopic pipe, an outer pipe, a lower connecting pipe and a flushing head, the outer pipe is a round pipe with internal threads at two ends, one end of the upper connecting pipe is provided with internal threads, the upper connecting pipe is in threaded connection with one end of the outer pipe, the lower connecting pipe is in threaded connection with the other end of the outer pipe, and the upper connecting pipe, the outer pipe and the lower connecting pipe are hollow pipes. The telescopic pipe is sleeved with the outer pipe in a sliding mode, one end of the telescopic pipe stretches into the upper connecting pipe in a sliding mode, the other end of the telescopic pipe penetrates out of the lower connecting pipe in a sliding mode and is in threaded connection with the flushing head, a damping block is installed on the telescopic pipe and divides the space between the outer pipe and the telescopic pipe into a left cavity and a right cavity, and the left cavity and the right cavity are filled with lubricating liquid. The section, in the right cavity, of the telescopic pipe is sleeved with a spring. The device can slowly move at a fixed position under the action of opposite force jointly generated by the spring and lubricating liquid in the left cavity and the right cavity of the damping block and under the action of thrust of high-pressure flushing liquid, so that the well wall can be uniformly flushed by the flushing liquid.

Description

Technical Field

[0001] The utility model relates to the field of underground pipeline cleaning, in particular to an underground self-moving tool. Background Art

[0002] Downhole pipeline cleaning plays the role of removing mud, cleaning and maintaining the well wall. It is an indispensable part of downhole drilling. Downhole pipeline cleaning uses hydraulic action to inject high-pressure water into the well to flush away the mud and debris on the well wall, so that the well wall remains clean and flat, which is convenient for the next operation. The principle of downhole pipeline cleaning is to inject water from the ground into the well, so that the water flow generates huge kinetic energy, and then the high-speed water flow is directed to the well wall through the flushing head to flush away the mud and debris on the well wall. During the flushing process, in order to ensure the flushing effect, the flushing head needs to move downward slowly and continuously to achieve longitudinal cleaning of the pipeline. At present, in order to ensure the cleaning effect, the staff needs to continuously pull the flushing pipe to move the flushing head, which is a large workload. Moreover, the manual pulling cannot control the moving speed and the flushing effect is poor. Summary of the Invention

[0003] The utility model aims to solve the deficiencies of the prior art and provides an underground self-moving tool.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A downhole self-moving tool comprises an upper connecting pipe, a telescopic pipe, an outer pipe, a lower connecting pipe and a flushing head. The outer pipe is a round pipe with internal threads at both ends. One end of the upper connecting pipe is provided with an internal thread. The upper connecting pipe is threadedly connected to one end of the outer pipe, and the lower connecting pipe is threadedly connected to the other end of the outer pipe. The upper connecting pipe, the outer pipe and the lower connecting pipe are hollow pipes. The telescopic pipe is slidably sleeved in the outer pipe. One end of the telescopic pipe slides into the upper connecting pipe, and the other end of the telescopic pipe slides out of the lower connecting pipe and is threadedly connected to the flushing head. A damping block is installed on the telescopic pipe. The damping block separates the space between the outer pipe and the telescopic pipe into a left chamber and a right chamber, and the left chamber and the right chamber are filled with lubricating liquid. A spring is sleeved on the section of the telescopic pipe in the right chamber.

[0006] The damping block is provided with a flow hole which passes through the left chamber and the right chamber.

[0007] The outer wall of the front middle section of the telescopic tube protrudes outward to form an outer convex platform, and the damping block is arranged on the right side of the outer convex platform.

[0008] A spring clamping platform is provided on the right side of the outer boss on the telescopic tube, and the spring is sleeved between the spring clamping platform of the telescopic tube and the end of the lower connecting pipe.

[0009] A first sealing ring is provided between the wall surface where the telescopic tube is connected to the upper connecting pipe.

[0010] A second sealing ring is provided at the connection between the upper connecting pipe and the outer pipe.

[0011] A third sealing ring is provided at the connection between the outer tube and the lower connecting pipe.

[0012] A fourth sealing ring is provided between the wall surface where the lower connecting pipe is connected to the telescopic pipe.

[0013] The beneficial effects of the utility model are as follows: the device of the utility model can move slowly in a fixed position through the reverse force jointly generated by the lubricating fluid in the left and right chambers of the spring and the damping block, as well as the thrust of the high-pressure flushing liquid, so that the flushing liquid can evenly flush the well wall, and there is no need to manually lift the flushing head, thereby reducing the workload and achieving a good flushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of the telescopic tube of the utility model in a contracted state;

[0015] Figure 2 This is a structural schematic diagram of the telescopic tube of the utility model in an extended state;

[0016] Figure 3 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0017] In the figure: 1 - upper connecting pipe; 2 - telescopic pipe; 21 - short screw; 22 - spring clamp; 3 - damping block; 31 - flow hole; 4 - spring; 5 - outer pipe; 6 - flushing head; 7 - lower connecting pipe; 8 - left chamber; 9 - right chamber; 10 - first sealing ring; 11 - second sealing ring; 12 - third sealing ring; 13 - fourth sealing ring;

[0018] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] A downhole self-moving tool comprises an upper connecting pipe 1, a telescopic tube 2, an outer tube 5, a lower connecting pipe 7 and a flushing head 6. The outer tube 5 is a round tube with internal threads at both ends. One end of the upper connecting pipe 1 is provided with an internal thread. The upper connecting pipe 1 is threadedly connected to one end of the outer tube 5, and the lower connecting pipe 7 is threadedly connected to the other end of the outer tube 5. The upper connecting pipe 1, the outer tube 5 and the lower connecting pipe 7 are hollow tubes. The telescopic tube 2 is slidably sleeved in the outer tube 5. One end of the telescopic tube 2 slides into the upper connecting pipe 1, and the other end of the telescopic tube 2 slides out of the lower connecting pipe 7 and is threadedly connected to the flushing head 6. A damping block 3 is installed on the telescopic tube 2. The damping block 3 separates the space between the outer tube 5 and the telescopic tube 2 into a left chamber 8 and a right chamber 9, and the left chamber 8 and the right chamber 9 are filled with lubricating fluid. A spring 4 is sleeved on the section of the telescopic tube 2 in the right chamber 9.

[0021] The damping block 3 is provided with a flow hole 31 that passes through the left chamber 8 and the right chamber 9. The aperture of the flow hole 31 is very small, and the lubricating fluid can only slowly enter the left chamber 8 from the right chamber 9.

[0022] The outer wall of the front middle section of the telescopic tube 2 bulges outward to form an outer boss 21 , and the damping block 3 is arranged on the right side of the outer boss 21 . A space is left between the outer boss 21 and the inner wall of the outer tube 5 to facilitate the circulation of lubricating fluid.

[0023] The telescopic tube 2 is provided with a spring clamping platform 22 on the right side of the outer boss 21. The spring 4 is sleeved between the spring clamping platform 22 of the telescopic tube 2 and the end of the lower connecting pipe 7. When the telescopic tube 2 moves relative to the outer tube 5, the spring 4 is compressed and the volume of the right chamber 9 becomes smaller.

[0024] A first sealing ring 10 is provided between the wall where the telescopic tube 2 and the upper connecting pipe 1 are connected, to prevent lubricating fluid from flowing into the inner cavity of the upper connecting pipe 1 from the gap between the wall where the telescopic tube 2 and the upper connecting pipe 1 are connected.

[0025] A second sealing ring 11 is provided at the connection between the upper connecting pipe 1 and the outer pipe 5 to prevent the lubricating liquid from leaking from the connection between the upper connecting pipe 1 and the outer pipe 5 .

[0026] A third sealing ring 12 is provided at the connection between the outer tube 5 and the lower connecting pipe 7 to prevent the lubricating liquid from leaking from the connection between the outer tube 5 and the lower connecting pipe 7 .

[0027] A fourth sealing ring 13 is provided between the wall where the lower connecting pipe 7 and the telescopic pipe 2 are connected, so as to prevent the lubricating fluid from flowing out of the gap between the wall where the lower connecting pipe 7 and the telescopic pipe 2 are connected.

[0028] During use, the tool is first lowered into the well to be cleaned. During the cleaning operation, high-pressure flushing liquid is transferred to the flushing head 6 through the telescopic tube 2 and then flushed toward the well wall. During cleaning, the impact of the high-pressure flushing liquid forces the telescopic tube 2 to move rapidly in the direction of the water flow. However, when the telescopic tube 2 moves relative to the outer tube 5, the spring 4 is compressed, and the volume of the right chamber 9 decreases, causing the lubricating liquid to flow to the left chamber 8 through the flow hole 31 of the damping block 3. The aperture of the flow hole 31 is very small, so the lubricating liquid can only slowly enter the left chamber 8 from the right chamber 9. The spring 4 and the damping block 3, together with the lubricating liquid in the left and right chambers, jointly generate a reverse force. As a result, the telescopic tube 2, under the combined action of the thrust and reverse force of the high-pressure flushing liquid during the extension process, tends to move slowly, allowing the flushing liquid to evenly flush the well wall.

[0029] After cleaning the first section of the well wall, the pressure is released, that is, the flushing fluid stops working. At this time, the telescopic tube 2 will return to its original contracted state under the action of the spring 4. The well operator continues to lower the tool to the next section of the well wall to be flushed, and then increases the pressure, that is, the flushing starts to clean. The above process is repeated until the entire well wall is flushed.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A downhole self-propelled tool, characterized in that: The invention comprises an upper connecting pipe (1), a telescopic pipe (2), an outer pipe (5), a lower connecting pipe (7) and a flushing head (6). The outer pipe (5) is a round pipe with internal threads at both ends. One end of the upper connecting pipe (1) is provided with an internal thread. The upper connecting pipe (1) is threadedly connected to one end of the outer pipe (5). The lower connecting pipe (7) is threadedly connected to the other end of the outer pipe (5). The upper connecting pipe (1), the outer pipe (5) and the lower connecting pipe (7) are hollow pipes. The telescopic pipe (2) is slidably sleeved in the outer pipe (5). The telescopic pipe (2) is threadedly sleeved in the outer pipe (5). ) slides into the upper connecting pipe (1), the other end of the telescopic tube (2) slides out of the lower connecting pipe (7) and is threadedly connected to the flushing head (6), a damping block (3) is installed on the telescopic tube (2), the damping block (3) separates the space between the outer tube (5) and the telescopic tube (2) into a left chamber (8) and a right chamber (9), and the left chamber (8) and the right chamber (9) are filled with lubricating liquid, and a spring (4) is sleeved on the section of the telescopic tube (2) in the right chamber (9).

2. A downhole self-propelled tool according to claim 1, characterized in that: The damping block (3) is provided with a flow hole (31) that passes through the left chamber (8) and the right chamber (9).

3. A downhole self-propelled tool according to claim 2, characterized in that: The outer wall of the front middle section of the telescopic tube (2) protrudes outward to form an outer boss (21), and the damping block (3) is arranged on the right side of the outer boss (21).

4. A downhole self-propelled tool according to claim 3, characterized in that: The telescopic tube (2) is provided with a spring clamping platform (22) on the right side of the outer boss (21), and the spring (4) is sleeved between the spring clamping platform (22) of the telescopic tube (2) and the end of the lower connecting pipe (7).

5. The downhole self-propelled tool according to claim 4, characterized in that: A first sealing ring (10) is provided between the wall surface where the telescopic tube (2) is connected to the upper connecting tube (1).

6. A downhole self-propelled tool according to claim 5, characterized in that: A second sealing ring (11) is provided at the connection between the upper connecting pipe (1) and the outer pipe (5).

7. A downhole self-propelled tool according to claim 6, characterized in that: A third sealing ring (12) is provided at the connection between the outer tube (5) and the lower connecting tube (7).

8. The downhole self-propelled tool according to claim 7, characterized in that: A fourth sealing ring (13) is provided between the wall surface where the lower connecting pipe (7) is connected to the telescopic pipe (2).

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