Anti-sloughing hole protection casing pipe for coal bed gas drilling

Abstract

The utility model discloses a coal bed gas well drilling anti-sloughing hole protection casing pipe, and particularly relates to the technical field of protection casing pipes, the coal bed gas well drilling anti-sloughing hole protection casing pipe comprises a first protection casing pipe body and a second protection casing pipe body, and a connecting pipe is arranged between the first protection casing pipe body and the second protection casing pipe body. The top end of the first wall protection sleeve body and the top end of the second wall protection sleeve body are each integrally connected with a connecting ring, and the inner walls of the top end and the bottom end of a connecting pipe are each provided with a connecting groove. The fixing plate is held by a hand to drive the two semicircular plates to rotate, the connecting pipe can be driven to rotate, and then the two connecting rings can be screwed into the two connecting grooves in the connecting pipe, so that the first wall protection sleeve body and the second wall protection sleeve body can be connected and fixed together; the situation that a large instrument is used for driving the second protection casing pipe body to rotate so that the first protection casing pipe body and the second protection casing pipe body can be connected can be avoided, and the connecting process of the two sections of casing pipes is more convenient and faster.

Description

Technical Field

[0001] This utility model relates to the field of casing technology, specifically to a casing for preventing collapse in coalbed methane drilling. Background Technology

[0002] Coalbed methane (CBM) refers to hydrocarbon gases stored in coal seams, primarily composed of methane. These gases are mainly adsorbed onto the surface of coal matrix particles, with some remaining free in coal pores or dissolved in coal seam water. It is a associated mineral resource of coal, belonging to unconventional natural gas, and has emerged as a clean and high-quality energy source and chemical feedstock in the last one or two decades internationally. During drilling of coalbed methane wells, casing is typically installed inside the borehole to prevent borehole collapse.

[0003] Currently, in actual use, the casing for preventing collapse in coalbed methane drilling is mostly composed of multiple pipe sections connected together by threads. Since a single pipe section is long and heavy, and the connection of two pipe sections requires rotating the pipe, this operation cannot be performed manually and requires the use of large machinery, which makes the connection process of the two casing sections inconvenient. Utility Model Content

[0004] The purpose of this utility model is to provide a casing for preventing collapse in coalbed methane drilling, so as to solve the above-mentioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a coalbed methane drilling anti-collapse casing, comprising:

[0006] A first protective sleeve body and a second protective sleeve body are provided, and a connecting pipe is provided between the first protective sleeve body and the second protective sleeve body. A connecting ring is integrally connected to the top end of the first protective sleeve body and the top end of the second protective sleeve body. A connecting groove is opened on the inner wall of the top end and the bottom end of the connecting pipe. The two connecting rings are respectively located in the two connecting grooves. The connecting rings and the connecting grooves are connected by threads.

[0007] Two semicircular plates are located at the middle of the outer end of the connecting pipe. Multiple snap-fit ​​protrusions are integrally connected to the outer end of the connecting pipe. Multiple snap-fit ​​grooves are opened at the inner ends of the two semicircular plates. The multiple snap-fit ​​protrusions are snapped into the multiple snap-fit ​​grooves respectively.

[0008] Preferably, each of the two ends of the semicircular plate is integrally connected with a connecting lug, which facilitates the movement of the two semicircular plates.

[0009] Preferably, one end of each of the two connecting ears is provided with a fixing plate, and the two fixing plates are respectively provided on both sides of the connecting tube. The inner side of the fixing plate is provided with a movable groove, and the movable groove is provided with two movable blocks. The two movable blocks are respectively fixedly connected to one end of the two connecting ears.

[0010] Preferably, the movable groove is provided with two pushing blocks inside, and the two pushing blocks are respectively located outside the two movable blocks. The movable groove is provided with a bidirectional lead screw, and the two ends of the bidirectional lead screw pass through the two movable blocks and the pushing blocks respectively. The bidirectional lead screw is movably connected to the two movable blocks. The bidirectional lead screw and the two pushing blocks are connected by threads with opposite thread directions. The two ends of the bidirectional lead screw are rotatably connected to the two ends inside the movable groove by bearings. One end of the bidirectional lead screw extends to one end of the fixed plate and is fixedly provided with a rotating block, which facilitates pushing the two movable blocks to move, thereby driving the two connecting ears and the semi-circular plate to move.

[0011] Preferably, a handle is fixedly provided on the middle of the outer side of the fixing plate, which makes it easy to hold and rotate the two semicircular plates, thereby saving effort.

[0012] Preferably, a sealing ring is fixedly provided inside each of the two connecting grooves, and the two sealing rings respectively abut against one end of the two connecting rings to facilitate sealing the connection between the first protective sleeve body and the second protective sleeve body.

[0013] Preferably, the top end of the first protective sleeve is machined with multiple breaking teeth to facilitate the breaking of suspended blocks during drilling.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0015] By holding the fixing plate, the two semicircular plates can be rotated, which in turn rotates the connecting pipe. This allows the two connecting rings to be screwed into the two connecting grooves on the connecting pipe, thus connecting and fixing the first and second protective sleeves together. This avoids the need for large instruments to rotate the second protective sleeve to connect the first and second protective sleeves, making the connection process of the two sleeves more convenient. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0019] Figure 3 This is a three-dimensional sectional view of the connecting pipe of this utility model;

[0020] Figure 4 This is a schematic diagram of the connection structure of the semicircular plate, connecting ear, and fixing plate of this utility model;

[0021] Figure 5 This is a three-dimensional sectional view of the fixing plate of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. First protective sleeve body; 2. Second protective sleeve body; 3. Connecting pipe; 4. Connecting ring; 5. Connecting groove; 6. Semicircular plate; 7. Snap-fit ​​protrusion; 8. Snap-fit ​​groove; 9. Connecting ear; 10. Fixing plate; 11. Movable groove; 12. Movable block; 13. Pushing block; 14. Two-way lead screw; 15. Rotating block; 16. Handle; 17. Sealing ring; 18. Crushing tooth. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] This utility model provides, for example Figures 1 to 5 The shown example of a coalbed methane drilling anti-collapse casing includes:

[0026] A first protective sleeve body 1 and a second protective sleeve body 2 are provided, and a connecting pipe 3 is provided between the first protective sleeve body 1 and the second protective sleeve body 2. A connecting ring 4 is integrally connected to the top end of the first protective sleeve body 1 and the top end of the second protective sleeve body 2. A connecting groove 5 is provided on the inner wall of the top and bottom ends of the connecting pipe 3. The two connecting rings 4 are respectively provided in the two connecting grooves 5. The connecting rings 4 and the connecting grooves 5 are connected by threads. A sealing ring 17 is fixedly provided in the two connecting grooves 5. The two sealing rings 17 are respectively in close contact with one end of the two connecting rings 4.

[0027] Two semicircular plates 6 are located at the middle of the outer end of the connecting pipe 3. Multiple snap-fit ​​protrusions 7 are integrally connected to the outer end of the connecting pipe 3. Multiple snap-fit ​​grooves 8 are opened on the inner end of each of the two semicircular plates 6. The multiple snap-fit ​​protrusions 7 are snapped into the multiple snap-fit ​​grooves 8 respectively. A connecting ear 9 is integrally connected to both ends of each of the two semicircular plates 6. A fixing plate 10 is provided at one end of each of the two connecting ears 9. The two fixing plates 10 are respectively located on both sides of the connecting pipe 3. A movable groove 11 is opened on the inner side of the fixing plate 10. Two movable blocks 12 are provided inside the movable groove 11. The two movable blocks 12 are fixedly connected to one end of each of the two connecting ears 9 respectively.

[0028] The movable groove 11 is equipped with two push blocks 13, which are located on the outside of the two movable blocks 12. The movable groove 11 is equipped with a bidirectional lead screw 14, which passes through the two movable blocks 12 and the push blocks 13 at both ends. The bidirectional lead screw 14 is movably connected to the two movable blocks 12. The bidirectional lead screw 14 is connected to the two push blocks 13 by threads with opposite thread directions. The two ends of the bidirectional lead screw 14 are rotatably connected to the two ends inside the movable groove 11 by bearings. One end of the bidirectional lead screw 14 extends to one end of the fixed plate 10 and is fixedly equipped with a rotating block 15. A handle 16 is fixedly provided in the middle of the outer side of the fixed plate 10. The length of the handle 16 can be determined according to the force required for a person to rotate the handle 3, and is not specifically limited.

[0029] The top of the first protective sleeve body 1 is machined with multiple breaking teeth 18.

[0030] Place the connecting tube 3 at the connection between the first protective sleeve body 1 and the second protective sleeve body 2, so that the connecting rings 4 on the first protective sleeve body 1 and the second protective sleeve body 2 are aligned with the two connecting grooves 5 respectively. At this time, hold the handle 16 and rotate the fixing plate 10, the connecting ear 9 and the semi-circular plate 6. The semi-circular plate 6 will drive the connecting tube 3 to rotate. At this time, the two connecting rings 4 will be screwed into the two connecting grooves 5, so that the first protective sleeve body 1 and the second protective sleeve body 2 can be connected together. Rotate the rotating block 15, and the rotating block 15 will drive the bidirectional screw 14 to rotate. Since the bidirectional screw 14 is connected to the two push blocks 13 by threads, the two push blocks 13 will move away from each other as the bidirectional screw 14 rotates. The two push blocks 13 will move to the two ends inside the movable groove 11. At this time, the two semi-circular plates 6 and their end connecting ears 9 can be separated, so that the two semi-circular plates 6 can be detached from the outside of the connecting tube 3. Then the two semi-circular plates 6 can be moved to the next position that needs to be connected.

[0031] This invention allows the two semi-circular plates 6 to rotate by holding the fixing plate 10, which in turn rotates the connecting pipe 3. This allows the two connecting rings 4 to be screwed into the two connecting grooves 5 on the connecting pipe 3, thus connecting and fixing the first protective sleeve body 1 and the second protective sleeve body 2 together. This avoids the need for large machinery to rotate the second protective sleeve body 2 to connect the first and second protective sleeve bodies 1 and 2, making the connection process of the two sleeve sections more convenient. This embodiment specifically solves the problem in the prior art that, in actual use, the protective sleeve for anti-collapse holes in coalbed methane drilling is mostly composed of multiple pipe sections connected together by threads. Because a single pipe section is long and heavy, and the connection of two pipe sections requires rotating the pipe, this operation cannot be performed manually and requires the use of large machinery, making the connection process of the two sleeve sections inconvenient.

[0032] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A coal bed gas drilling hole anti-sloughing wall protection casing, characterized in that, include: A first protective sleeve body (1) and a second protective sleeve body (2) are provided with a connecting pipe (3) between the first protective sleeve body (1) and the second protective sleeve body (2). A connecting ring (4) is integrally connected to the top end of the first protective sleeve body (1) and the top end of the second protective sleeve body (2). A connecting groove (5) is opened on the inner wall of the top and bottom ends of the connecting pipe (3). The two connecting rings (4) are respectively located inside the two connecting grooves (5). The connecting rings (4) and the connecting grooves (5) are connected by threads. Two semicircular plates (6) are provided at the middle of the outer end of the connecting pipe (3). Multiple snap-fit ​​protrusions (7) are integrally connected to the outer end of the connecting pipe (3). Multiple snap-fit ​​grooves (8) are opened at the inner end of the two semicircular plates (6). The multiple snap-fit ​​protrusions (7) are snapped into the multiple snap-fit ​​grooves (8) respectively.

2. The anti-sloughing casing for coal-bed gas drilling of claim 1, wherein: Both ends of the semicircular plate (6) are integrally connected with a connecting lug (9).

3. The anti-sloughing casing for coal-bed gas drilling of claim 2, wherein: One end of each of the two connecting ears (9) is provided with a fixing plate (10). The two fixing plates (10) are respectively located on both sides of the connecting tube (3). The inner side of the fixing plate (10) is provided with a movable groove (11). The movable groove (11) is provided with two movable blocks (12). The two movable blocks (12) are respectively fixedly connected to one end of the two connecting ears (9).

4. The anti-sloughing casing for coal-bed gas drilling of claim 3, wherein: The movable groove (11) is provided with two push blocks (13) inside, and the two push blocks (13) are respectively located outside the two movable blocks (12). The movable groove (11) is provided with a bidirectional lead screw (14). The two ends of the bidirectional lead screw (14) pass through the two movable blocks (12) and the push blocks (13) respectively. The bidirectional lead screw (14) is movably connected to the two movable blocks (12). The bidirectional lead screw (14) and the two push blocks (13) are connected by threads with opposite thread directions. The two ends of the bidirectional lead screw (14) are rotatably connected to the two ends inside the movable groove (11) by bearings. One end of the bidirectional lead screw (14) extends to one end of the fixed plate (10) and is fixedly provided with a rotating block (15).

5. The anti-sloughing casing for coal-bed gas drilling of claim 4, wherein: A handle (16) is fixedly provided on the middle of the outer side of the fixing plate (10).

6. The anti-sloughing casing for coal-bed gas drilling of claim 1, wherein: Each of the two connecting grooves (5) is fixedly provided with a sealing ring (17), and the two sealing rings (17) are respectively in close contact with one end of the two connecting rings (4).

7. The anti-sloughing casing for coal-bed gas drilling of claim 1, wherein: The top of the first protective sleeve body (1) is machined with multiple breaking teeth (18).

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