Conversion coupling for shale gas exploitation

Abstract

The invention belongs to the technical field of shale gas exploitation, and provides a conversion coupling for shale gas exploitation, which comprises a coupling body and two groups of pipelines, internal threads are arranged on the inner wall of the coupling body, and external threads in threaded connection with the internal threads are arranged on the outer surfaces of the pipelines. The peripheries of the pipeline and the hoop body are provided with limiting assemblies used for limiting the positions after the pipeline and the hoop body are connected. A sealing assembly used for improving the sealing performance of the connecting position is arranged at the connecting position of the interior of the pipeline and the hoop body. The hoop body and the pipeline can be limited through the limiting rod after being connected, connection disconnection caused by rotation of the pipeline or the hoop body due to external factors is effectively avoided, the sealing performance of the connecting position of the pipeline and the hoop body can be effectively enhanced, and then shale gas leakage caused by insufficient sealing performance is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of shale gas mining, in particular to a conversion collar for shale gas mining. Background Art

[0002] Shale gas is an unconventional natural gas with methane as its main component, which is stored in organic-rich shales and their interlayers. It is formed in two ways: biogenic and thermogenic. It has geological and state characteristics such as "self-generation and self-storage", ultra-low permeability, and is mainly in adsorption and free states. Its extraction requires technologies such as horizontal wells and hydraulic fracturing, which is difficult but has a long extraction cycle. The world's recoverable resources are abundant and mainly distributed in China, the United States and other countries. China's reserves rank among the highest in the world. Its development is of great significance to increasing energy supply, ensuring energy security, driving economic development and reducing environmental pollution.

[0003] In the process of shale gas extraction, conversion couplings are needed to connect the pipelines. However, the current conversion coupling structure is relatively simple and does not have a limiting protection structure. This may cause the pipeline and the coupling body to rotate due to external factors such as accidental collision or shaking after the connection is completed, which may cause the connection between the pipeline and the coupling body to loosen or even break. Moreover, it does not have a sealing structure, and shale gas may leak to the outside from the gap at the connection between the pipeline and the coupling body, thereby causing a waste of resources.

[0004] Therefore, those skilled in the art have proposed a conversion coupling for shale gas development to solve the problems raised in the background art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a conversion coupling for shale gas development to solve the problems of insufficient stability and poor sealing between the pipe and the coupling body in the prior art.

[0006] A conversion coupling for shale gas development includes a coupling body and two groups of pipes. The inner wall of the coupling body is provided with an internal thread, and the outer surface of the pipe is provided with an external thread threadedly connected to the internal thread. The outer periphery of the pipe and the coupling body is provided with a limiting component for limiting the position after the two are connected. The connection between the inside of the pipe and the coupling body is provided with a sealing component for improving the sealing of the connection.

[0007] Preferably, the limiting assembly includes a first mounting ring, a limiting hole, a second mounting ring and a limiting rod. The first mounting ring is fixedly connected to the outer periphery of the pipe and is located on the side of the external thread away from the hoop body. The limiting holes are provided in several groups and pass through the first mounting ring. The second mounting ring is slidably connected to the outer periphery of both ends of the hoop body. The limiting rod is fixedly connected to the side of the second mounting ring away from the middle of the hoop body and is adapted to the size of the limiting hole.

[0008] Preferably, the limiting assembly also includes a slide groove, a slider and a spring, the slide groove is opened on the top and bottom surfaces of the hoop body near both ends, the slider is fixedly connected to the top and bottom inner walls of the second mounting ring and is slidably connected to the slide groove, and the spring is installed inside the slide groove and its two ends are respectively fixedly connected to one side of the slider close to the middle of the hoop body and the inner wall of one side of the slide groove close to the middle of the hoop body.

[0009] Preferably, the sealing assembly includes a sealing groove, an installation groove and a sealing ring. The sealing groove is opened on the outer surface of the pipe and is located on the side of the external thread close to the hoop body. The installation groove is opened on the inner wall of the hoop body. The sealing ring is made of rubber and is hollow inside. The sealing ring is installed inside the installation groove and is adapted to the size of the sealing groove after expansion.

[0010] Preferably, the sealing assembly also includes an air cavity, a piston and a connecting hole. The air cavity is annular and is opened inside the hoop body. The piston is annular and is slidably connected to the air cavity. The connecting hole is opened on the inner wall of the air cavity away from the middle of the hoop body and is connected to the sealing ring.

[0011] Preferably, the sealing assembly also includes a connecting groove and a connecting rod, the connecting groove is opened on the inner wall of the slide groove close to the middle of the hoop body and is connected to the air cavity, the connecting rod is movably connected to the connecting groove and its two ends are respectively fixedly connected to the side of the slider close to the middle of the hoop body and the side of the piston close to the middle of the hoop body.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a limiting component, which pulls the second mounting ring toward the middle of the hoop body, causing it to drive the slider to slide synchronously along the slide groove and squeeze the spring. When the limiting rod moves with the second mounting ring to the position closest to the middle of the hoop body, the pipe is connected to the hoop body through the external thread and the internal thread, and the limiting hole of the first mounting block and the limiting rod are on the same axis. Then, the second mounting ring is loosened, the spring rebounds, and the second mounting ring is driven by the slider to move in the direction away from the middle of the hoop body. When the limiting rod is inserted into the limiting hole, the hoop body and the pipe can be limited. This design allows the hoop body to be limited by the limiting rod after being connected to the pipe, effectively preventing the pipe or hoop body from rotating due to external factors and causing the connection to be disconnected.

[0013] 2. The present invention is provided with a sealing assembly. When the slider slides toward the middle of the hoop body, the connecting rod drives the piston to slide synchronously with the slider along the air cavity and draws the air in the sealing ring into the air cavity. When the sealing ring shrinks to be immersed in the installation groove, the pipeline is connected to the hoop body. After the connection is completed, the slider slides along the slide groove away from the middle of the hoop body. At this time, the connecting rod drives the piston to slide synchronously with the slider along the air cavity and sends the air in the air cavity into the sealing ring. When the sealing ring expands to fit tightly with the sealing groove, the connection between the pipeline and the hoop body can be sealed. This design can effectively enhance the sealing performance of the connection between the pipeline and the hoop body, thereby avoiding shale gas leakage caused by insufficient sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the pipeline structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the hoop body of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0015] In the picture: 1. Hoop body; 2. Pipe; 3. Internal thread; 4. External thread; 5. Limiting assembly; 51. First mounting ring; 52. Limiting hole; 53. Second mounting ring; 54. Limiting rod; 55. Slide groove; 56. Slider; 57. Spring; 6. Sealing assembly; 61. Sealing groove; 62. Mounting groove; 63. Sealing ring; 64. Air cavity; 65. Piston; 66. Connecting hole; 67. Connecting groove; 68. Connecting rod. DETAILED DESCRIPTION

[0016] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0017] As attached Figure 1 To the attached Figure 5 As shown: Example 1: The present invention provides a conversion coupling for shale gas exploitation, comprising a coupling body 1 and two groups of pipes 2. The inner wall of the coupling body 1 is provided with an internal thread 3, and the outer surface of the pipe 2 is provided with an external thread 4 threadedly connected to the internal thread 3. The outer periphery of the pipe 2 and the coupling body 1 is provided with a limiting component 5 for limiting the position after the two are connected. The limiting component 5 includes a first mounting ring 51, a limiting hole 52, a second mounting ring 53, a limiting rod 54, a slide groove 55, a slider 56 and a spring 57.

[0018] Furthermore, the first mounting ring 51 is fixedly connected to the outer periphery of the pipe 2 and is located on the side of the external thread 4 away from the hoop body 1. Several groups of limiting holes 52 are provided and pass through the first mounting ring 51. The second mounting ring 53 is slidably connected to the outer periphery of both ends of the hoop body 1. The limiting rod 54 is fixedly connected to the side of the second mounting ring 53 away from the middle of the hoop body 1 and is adapted to the size of the limiting hole 52. The slide groove 55 is opened on the top and bottom surfaces of the hoop body 1 near both ends. The slider 56 is fixedly connected to the top and bottom inner walls of the second mounting ring 53 and is slidably connected to the slide groove 55. The spring 57 is installed inside the slide groove 55 and its two ends are respectively fixedly connected to the side of the slider 56 close to the middle of the hoop body 1 and the inner wall of the slide groove 55 close to the middle of the hoop body 1.

[0019] As can be seen from the above, by pulling the second mounting ring 53 toward the middle of the hoop body 1, the slider 56 can be driven to slide synchronously along the slide groove 55 and squeeze the spring 57. By loosening the second mounting ring 53, the spring 57 rebounds and the second mounting ring 53 can be driven by the slider 56 to move away from the middle of the hoop body 1. By this method, the position of the limit rod 54 can be adjusted.

[0020] Example 2: This example is basically the same as the previous example, except that a sealing assembly 6 for improving the sealing of the connection is provided at the connection between the inside of the pipe 2 and the hoop body 1. The sealing assembly 6 includes a sealing groove 61, an installation groove 62, a sealing ring 63, an air cavity 64, a piston 65, a connecting hole 66, a connecting groove 67 and a connecting rod 68.

[0021] Furthermore, a sealing groove 61 is provided on the outer peripheral surface of the pipe 2 and is located on the side of the external thread 4 close to the hoop body 1. A mounting groove 62 is provided on the inner wall of the hoop body 1. A sealing ring 63 is made of rubber and is hollow inside. The sealing ring 63 is installed inside the mounting groove 62 and, after expansion, is adapted to the size of the sealing groove 61. The air cavity 64 is annular and provided inside the hoop body 1. The piston 65 is annular and slidably connected to the air cavity 64. A connecting hole 66 is provided on the inner wall of the air cavity 64 away from the middle of the hoop body 1 and is communicated with the sealing ring 63. A connecting groove 67 is provided on the inner wall of the slide groove 55 close to the middle of the hoop body 1 and is communicated with the air cavity 64. A connecting rod 68 is movably connected to the connecting groove 67, and its two ends are respectively fixedly connected to one side of the slider 56 close to the middle of the hoop body 1 and one side of the piston 65 close to the middle of the hoop body 1.

[0022] As can be seen from the above, by sliding the piston 65 along the air cavity 64, the air in the air cavity 64 can be sent to the sealing ring 63 through the connecting hole 66 to expand it, or the air in the sealing ring 63 can be pumped into the air cavity 64 to shrink it. When the expanded sealing ring 63 fits tightly with the sealing groove 61, the connection between the pipe 2 and the hoop body 1 can be sealed.

[0023] Working principle: First, pull the second mounting ring 53 toward the middle of the hoop body 1, so that it drives the slider 56 to slide synchronously along the slide groove 55 and squeeze the spring 57. During this process, the connecting rod 68 drives the piston 65 to slide synchronously along the air cavity 64 with the slider 56, and the air in the sealing ring 63 is pumped into the air cavity 64. When the sealing ring 63 shrinks to be immersed in the mounting groove 62, the pipe 2 is connected to the hoop body 1 through the external thread 4 and the internal thread 3 until the sealing groove 61 is in the inner circle of the sealing ring 63, and the limiting hole 52 of the first mounting block and the limiting rod 54 are on the same axis, and then the second mounting block is released. Ring 53, spring 57 rebounds, and drives the second mounting ring 53 to move away from the middle of the hoop body 1 through the slider 56. When the limiting rod 54 is inserted into the limiting hole 52, the hoop body 1 and the pipe 2 can be limited to prevent the pipe 2 and the hoop body 1 from rotating due to external factors and causing disconnection. During this process, the connecting rod 68 drives the piston 65 to slide synchronously along the air cavity 64 with the slider 56, and sends the air in the air cavity 64 to the sealing ring 63. When the sealing ring 63 expands to fit tightly with the sealing groove 61, the connection between the pipe 2 and the hoop body 1 can be sealed, effectively preventing shale gas from leaking from the connection.

[0024] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Any changes, modifications, replacements and variations of the above embodiments by ordinary technicians in this field within the scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A conversion coupling for shale gas development, characterized by: The invention comprises a hoop body (1) and two groups of pipes (2), wherein the inner wall of the hoop body (1) is provided with an internal thread (3), the outer surface of the pipe (2) is provided with an external thread (4) threadedly connected to the internal thread (3), the outer periphery of the pipe (2) and the hoop body (1) is provided with a limiting component (5) for limiting the position after the two are connected, and the connection between the inside of the pipe (2) and the hoop body (1) is provided with a sealing component (6) for improving the sealing performance of the connection.

2. A shale gas extraction conversion coupling according to claim 1, characterized in that: The limiting assembly (5) comprises a first mounting ring (51), a limiting hole (52), a second mounting ring (53) and a limiting rod (54); the first mounting ring (51) is fixedly connected to the outer periphery of the pipe (2) and is located on the side of the external thread (4) away from the hoop body (1); the limiting holes (52) are provided in a plurality of groups and pass through the first mounting ring (51); the second mounting ring (53) is slidably connected to the outer periphery of both ends of the hoop body (1); the limiting rod (54) is fixedly connected to the side of the second mounting ring (53) away from the middle of the hoop body (1) and is adapted to the size of the limiting hole (52).

3. A shale gas extraction conversion coupling according to claim 2, characterized in that: The limiting assembly (5) further comprises a slide groove (55), a slider (56) and a spring (57), wherein the slide groove (55) is provided on the top and bottom surfaces of the hoop body (1) near both ends, the slider (56) is fixedly connected to the top and bottom inner walls of the second mounting ring (53) and is slidably connected to the slide groove (55), and the spring (57) is installed inside the slide groove (55) and has two ends respectively fixedly connected to one side of the slider (56) near the middle of the hoop body (1) and one side of the inner wall of the slide groove (55) near the middle of the hoop body (1).

4. A conversion coupling for shale gas development as claimed in claim 3, characterized in that: The sealing assembly (6) comprises a sealing groove (61), a mounting groove (62) and a sealing ring (63). The sealing groove (61) is formed on the outer peripheral surface of the pipe (2) and is located on the side of the external thread (4) close to the hoop body (1). The mounting groove (62) is formed on the inner wall of the hoop body (1). The sealing ring (63) is made of rubber and is hollow inside. The sealing ring (63) is installed inside the mounting groove (62) and is adapted to the size of the sealing groove (61) after expansion.

5. A conversion coupling for shale gas development as claimed in claim 4, characterized in that: The sealing assembly (6) further comprises an air cavity (64), a piston (65) and a connecting hole (66); the air cavity (64) is annular and is opened inside the hoop body (1); the piston (65) is annular and is slidably connected to the air cavity (64); the connecting hole (66) is opened on the inner wall of the air cavity (64) on one side away from the middle of the hoop body (1) and is connected to the sealing ring (63).

6. A conversion coupling for shale gas development as claimed in claim 5, characterized in that: The sealing assembly (6) further includes a connecting groove (67) and a connecting rod (68), wherein the connecting groove (67) is formed on an inner wall of the slide groove (55) on one side close to the middle of the hoop body (1) and is communicated with the air cavity (64), and the connecting rod (68) is movably connected to the connecting groove (67) and has two ends fixedly connected to one side of the slider (56) close to the middle of the hoop body (1) and one side of the piston (65) close to the middle of the hoop body (1).

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