Coal-bed gas well yield increasing fracturing device and method

Abstract

The coal-bed gas well yield increasing fracturing device comprises two sets of fixing frames which are horizontally arranged in a mirror image mode, four sets of fracturing agent tanks and four sets of fracturing agent separating and recycling tanks are fixedly assembled on the two sets of fixing frames correspondingly, and fracturing agent well inlet pipes are arranged on the close sides of the fracturing agent tanks and the fracturing agent separating and recycling tanks correspondingly; the eight groups of fracturing agent well inlet pipes are arranged in the coal-bed gas well beam pipe group; the other sides of the four sets of fracturing agent separation and recovery tanks are connected to a coal bed gas output pipe, fracturing agent recovery pipes are arranged at the lower ends of the sides of the four sets of fracturing agent separation and recovery tanks, and the other ends of the fracturing agent recovery pipes are connected to the corresponding fracturing agent tanks. And the well mouth fixing assembly is horizontally and fixedly arranged on the ground right above the coal-bed gas well.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane exploitation, and in particular to a coalbed methane well production enhancement fracturing device and method. Background Art

[0002] Coalbed methane, also known as coalbed adsorbed gas, coalbed methane or coal mine gas, is a product of coal metamorphism and is continuously generated during the coal metamorphism process. It is adsorbed on the surface of coal molecules, partially free in coal pores or dissolved in coalbed water. It is a self-generated and self-stored unconventional natural gas with huge reserves, high quality and high efficiency, green and clean low carbon. Compared with general oil and gas layers, coal seams have low permeability and low abundance. These characteristics make it difficult to produce a large amount of coalbed methane during the mining process, so it is necessary to use fracturing technology to improve the permeability of coal seams, thereby increasing the production of coalbed methane.

[0003] There are many types of fracturing technologies for coalbed methane wells, including hydraulic fracturing, nitrogen fracturing, carbon dioxide fracturing, etc. These technologies have their own advantages and disadvantages and need to be selected according to the specific conditions of the coal seam and the mining needs. In addition, when implementing fracturing technology, many factors need to be considered, such as the selection of fracturing fluid, the setting of fracturing parameters, the integrity of the wellbore, etc. Existing fracturing devices often use a single fracturing method for mining. However, in the face of complex and changeable coal seam environments, a single fracturing method will cause incomplete coalbed methane mining in some coal seams, resulting in reduced production and mining efficiency. In addition, a single mining method will cause damage to the coal seam to a greater extent and even cause safety accidents.

[0004] Therefore, it is necessary to provide a coalbed methane well production enhancement fracturing device to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a coalbed methane well production enhancement and fracturing device, comprising:

[0006] The fixed frame is provided with two groups in horizontal mirror image, and four groups of fracturing agent tanks and four groups of fracturing agent separation and recovery tanks are respectively fixedly mounted on the two groups of fixed frames, and the fracturing agent tanks and the fracturing agent separation and recovery tanks are both provided with fracturing agent well inlet pipes near the sides, and the eight groups of fracturing agent well inlet pipes are all arranged in the coalbed methane well bundle pipe group;

[0007] The other sides of the four groups of fracturing agent separation and recovery tanks are all connected to the coalbed methane output pipe, and the lower ends of the four groups of fracturing agent separation and recovery tanks are all provided with fracturing agent recovery pipes, and the other ends of the fracturing agent recovery pipes are connected to the corresponding fracturing agent tanks;

[0008] The wellhead fixing assembly is horizontally fixed on the ground just above the coalbed methane well.

[0009] Further, as a preference, the eight groups of fracturing agent inlet pipes are all coiled in a coiler, and the coiler is fixedly assembled on the close side of the corresponding fracturing agent tank and the fracturing agent separation and recovery tank.

[0010] Further, as a preference, the coalbed methane well bundle pipe group includes a bundle pipe, one end of which is fixed on the wellhead fixed assembly, and a guide solid pipe is coaxially slidably arranged inside the bundle pipe, four groups of fracturing agent pipes and four groups of fracturing agent and coalbed methane pipes are arranged between the bundle pipe and the guide solid pipe, the four groups of fracturing agent pipes and four groups of fracturing agent and coalbed methane pipes are distributed in a circle, and the relative fracturing agent pipes and fracturing agent and coalbed methane pipes are respectively connected to the corresponding fracturing agent tanks and the corresponding fracturing agent well inlet pipes of the fracturing agent separation and recovery tanks.

[0011] Further, as a preference, the other end of the bundle pipe is fixedly equipped with a coalbed methane well traveling assembly, and the four groups of fracturing agent pipes on this side of the bundle pipe and the four groups of fracturing agent and coalbed methane pipes are equipped with five groups of coalbed methane well separators outside;

[0012] The coalbed methane well separator close to the bundle pipe is fixed to the coalbed methane well traveling assembly, and the coalbed methane well separator far away from the bundle pipe is fixed on the side that guides the solid pipe away from the bundle pipe, and the other end of this group of coalbed methane well separators is fixedly provided with a coalbed methane well traveling assembly, and the other side of this group of coalbed methane well traveling assembly is fixedly provided with a well wall cleaner, and the two groups of coalbed methane well traveling assemblies are arranged in a mirror image.

[0013] Further, as a preference, the coalbed methane well advancing assembly comprises:

[0014] A telescopic hydraulic sleeve is fixedly assembled between the bundle pipe and a coal-bed methane well separator close to the bundle pipe or between a coal-bed methane well separator far from the bundle pipe and a well wall cleaner;

[0015] An adjusting sleeve is coaxially slidably sleeved on the telescopic hydraulic sleeve, and a compression spring is fixedly arranged between the piston end of the telescopic hydraulic sleeve and the adjusting sleeve;

[0016] The first connecting rod is provided with multiple groups, all of which are rotatably assembled on the other side of the adjusting sleeve. A second connecting rod is rotatably arranged in the middle of the first connecting rod, and the other end of the second connecting rod is fixedly assembled on the telescopic hydraulic sleeve, and the other end of each group of the first connecting rods is provided with a self-driving wheel.

[0017] Further, preferably, the coalbed methane well separator comprises:

[0018] The fixed shell is fixedly mounted on the outside of the four groups of fracturing agent pipes and the four groups of fracturing agent and coalbed methane pipes. The two sides of the fixed shell are embedded with bundle tube locking ports, and a fixed closed air bag is coaxially fixedly arranged on the outside of the fixed shell.

[0019] Further, as a preference, two groups of pipe clamping fixtures are rotatably arranged on the inner walls of the four groups of coalbed methane well separator fixing shells close to the bundled pipes, and the two groups of pipe clamping fixtures are arranged in a mirror image.

[0020] Further, as a preference, a fixing sleeve is fixedly provided on the inner wall of a fixed shell of a group of coalbed methane well separators away from the bundle pipe.

[0021] Further, preferably, the friction force of the wall of the fixing sleeve is smaller than the clamping force of the pipe clamping fixture.

[0022] A coalbed methane well production enhancement fracturing device and method, comprising the following steps:

[0023] S1. First, complete the drilling of the coalbed methane well through drilling equipment, then conduct geological testing on the part of the coalbed methane well that needs fracturing, and select the appropriate fracturing method according to different geological conditions;

[0024] S2. Select the appropriate number of devices according to the actual situation. The number of fracturing agent tanks, fracturing agent separation and recovery tanks, fracturing agent pipes, and fracturing agent and coalbed methane pipes is equal to the number of selected fracturing methods, and the number of coalbed methane well separators is one more than the number of selected fracturing methods;

[0025] S3. Take the selection of four fracturing methods as an example: a coalbed methane well bundle pipe group, two sets of coalbed methane well traveling components, five sets of coalbed methane well separators and a well wall cleaner are put into the coalbed methane well;

[0026] S4. The two groups of coalbed methane well advancing components will drive the other components to move along the coalbed methane well, and at the same time, the well wall cleaner will clean the dust on the well wall of the coalbed methane well by rotating;

[0027] S5. When the coalbed methane well separator close to the bundle pipe reaches the edge of the coal seam to be fractured, the wellhead fixing assembly clamps and fixes the coalbed methane well bundle pipe group, and at the same time, the fixed sealing airbag of the coalbed methane well separator group expands to seal the coalbed methane well;

[0028] S6. The pipe clamping fixture in the group of coalbed methane well separators will be adjusted to a suitable position, and clamp and fix the fracturing agent pipe and the fracturing agent and coalbed methane pipe corresponding to the fracturing agent tank and the fracturing agent separation recovery tank corresponding to the fracturing method corresponding to the coal seam geology;

[0029] S7. The two sets of bundle pipe locking ports in the group of coalbed methane well separators will fill the gaps between the group of coalbed methane well separators and the fracturing agent pipes and between the fracturing agent and the coalbed methane pipes without affecting the transmission between the four sets of fracturing agent pipes and the four sets of fracturing agent and coalbed methane pipes, thereby achieving a sealing effect;

[0030] S8. Another set of coalbed methane well advancing components will continue to drive four sets of coalbed methane well separators, well wall cleaners, the remaining three sets of fracturing agent pipes and three sets of fracturing agent and coalbed methane pipes, and guide solid pipes to advance along the coalbed methane well, and fix the corresponding coalbed methane well separators and components thereon at the junction of different geology of the coal seam until all coalbed methane well separators are fixed;

[0031] S9. Five groups of coalbed methane well separators separate the coalbed methane well to be fractured into four closed spaces;

[0032] S10. Open the fracturing agent tank and inject the corresponding fracturing agent into the corresponding closed space in the coalbed methane well, and adjust to the appropriate fracturing parameters. The fracturing agent carrying the coalbed methane will be introduced into the fracturing agent separation and recovery tank through the fracturing agent and coalbed methane pipe;

[0033] S11. The fracturing agent separation and recovery tank will separate the fracturing agent from the coalbed methane. The coalbed methane will be input into other devices through the coalbed methane output pipe, and the fracturing agent will be introduced into the corresponding fracturing agent tank through the corresponding fracturing agent recovery pipe for recycling. If necessary, a fracturing agent purifier can be set in the middle of the fracturing agent recovery pipe.

[0034] Compared with the prior art, the present invention provides a coalbed methane well production enhancement fracturing device and method, which has the following beneficial effects:

[0035] In the present invention, the fracturing agent separation and recovery tank is arranged to separate the mixture of the refluxed fracturing agent and coalbed methane, and transmit the coalbed methane through the coalbed methane output pipe. At the same time, the separated fracturing agent is introduced into the corresponding fracturing agent tank through the fracturing agent recovery pipe for recycling. According to the use of the fracturing agent, a fracturing agent purifier can be selectively arranged in the middle of the fracturing agent recovery pipe. At the same time, the selection of the fracturing agent purifier should fully consider the composition of the fracturing agent, and then select the corresponding fracturing agent purifier), thereby reducing the production cost.

[0036] In the present invention, after the drilling device completes drilling, it is necessary to conduct geological inspection on the part of the coalbed methane well that needs to be fractured, and divide it according to different geological conditions and select the appropriate fracturing method, and adjust the components and parameters of the device according to the selected fracturing method and the number of fracturing methods, and complete the isolation of the coalbed methane well to be fractured with the cooperation of each component, and then perform fracturing according to the fracturing method corresponding to the coal seam geology corresponding to each closed space, so as to more effectively exploit the coalbed methane and improve the exploitation efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of a coalbed methane well production enhancement and fracturing device;

[0038] Figure 2A gas well cross-section diagram of a coalbed methane well production enhancement and fracturing device;

[0039] Figure 3 This is a schematic diagram of the cross-sectional structure of a vertical well of a bundled pipe group of a coalbed methane well;

[0040] Figure 4 This is a schematic diagram of the horizontal well structure of the bundled pipe group of a coalbed methane well;

[0041] Figure 5 This is a schematic diagram of the structure of the coalbed methane well traveling assembly;

[0042] Figure 6 This is a schematic diagram of the structure of a coalbed methane well separator;

[0043] Figure 7 A schematic diagram of the internal structure of a coalbed methane well separator far away from a vertical well;

[0044] Figure 8 The schematic diagram of the internal structure of the separators of other coalbed methane wells is shown;

[0045] In the figure: 1, fixed frame; 2, fracturing agent tank; 3, fracturing agent separation and recovery tank; 4, fracturing agent inlet pipe; 5, fracturing agent recovery pipe; 6, coalbed methane output pipe; 7, coalbed methane well bundle pipe group; 8, wellhead fixing assembly; 9, coalbed methane well travel assembly; 10, coalbed methane well separator; 11, wellbore cleaner; 12, coil; 71, bundle pipe; 72, fracturing agent pipe; 73, fracturing agent and coalbed methane pipe; 74, guiding solid pipe; 91, telescopic hydraulic sleeve; 92, compression spring; 93, adjusting sleeve; 94, first connecting rod; 95, second connecting rod; 96, self-driving wheel; 101, fixed shell; 102, bundle pipe locking mouth; 103, fixed closed airbag; 104, pipe clamping fixture; 105, fixed sleeve. DETAILED DESCRIPTION

[0046] See also Figures 1 to 8 The present invention provides a coalbed methane well production enhancement and fracturing device, comprising:

[0047] A fixed frame 1 is provided with two groups of horizontal mirror images, and four groups of fracturing agent tanks 2 and four groups of fracturing agent separation and recovery tanks 3 are fixedly mounted on the two groups of fixed frames 1, and the fracturing agent tanks 2 and the fracturing agent separation and recovery tanks 3 are provided with fracturing agent well inlet pipes 4 near the sides, and the eight groups of fracturing agent well inlet pipes 4 are all arranged in the coalbed methane well bundle pipe group 7;

[0048] The other sides of the four groups of fracturing agent separation and recovery tanks 3 are all connected to the coalbed methane output pipe 6, and the lower ends of the four groups of fracturing agent separation and recovery tanks 3 are all provided with fracturing agent recovery pipes 5, and the other ends of the fracturing agent recovery pipes 5 are connected to the corresponding fracturing agent tanks 2;

[0049] A wellhead fixing assembly 8 is horizontally fixedly arranged on the ground just above the coalbed methane well;

[0050] As a preferred embodiment, the setting of the wellhead fixing component 8 can fix the coalbed methane well bundle pipe group 7 during operation to prevent it from affecting the operation of the device. After the drilling device completes drilling, it is necessary to conduct geological inspection on the part of the coalbed methane well that needs to be fractured, and divide it according to different geological conditions and select a suitable fracturing method, and adjust the components and parameters of the device according to the selected fracturing method and the number of fracturing methods. The fracturing agent separation and recovery tank 3 can separate the mixture of fracturing agent and coalbed methane that flows back, and transmit the coalbed methane through the coalbed methane output pipe 6. At the same time, the separated fracturing agent is introduced into the corresponding fracturing agent tank 2 through the fracturing agent recovery pipe 5 for recycling (according to the use of the fracturing agent, a fracturing agent purifier can be selectively set in the middle of the fracturing agent recovery pipe 5, and the selection of the fracturing agent purifier should fully consider the composition of the fracturing agent, and then select the corresponding fracturing agent purifier), thereby reducing production costs.

[0051] Furthermore, the eight groups of fracturing agent inlet pipes 4 are all coiled in a coiler 12, and the coiler 12 is fixedly assembled on the side close to the corresponding fracturing agent tank 2 and the fracturing agent separation and recovery tank 3;

[0052] As a preferred embodiment, the arrangement of the coil 12 can maximize the length of the fracturing agent inlet pipe 4 without affecting the transmission of the fracturing agent and the fracturing agent mixture, thereby allowing the device to perform deeper fracturing work, thereby improving the fracturing efficiency.

[0053] Further, the bundled pipe group 7 of the coalbed methane well includes a bundled pipe 71, one end of which is fixed on the wellhead fixing assembly 8, and a guiding solid pipe 74 is coaxially slidably arranged inside the bundled pipe 71, and four groups of fracturing agent pipes 72 and four groups of fracturing agent and coalbed methane pipes 73 are arranged between the bundled pipe 71 and the guiding solid pipe 74, and the four groups of fracturing agent pipes 72 and the four groups of fracturing agent and coalbed methane pipes 73 are distributed in a circle, and the relative fracturing agent pipes 72 and the fracturing agent and coalbed methane pipes 73 are respectively connected to the corresponding fracturing agent tank 2 and the corresponding fracturing agent well inlet pipe 4 of the fracturing agent separation and recovery tank 3;

[0054] As a preferred embodiment, the lengths of the bundle tube 71 and the guide solid tube 74 are initially determined values ​​and the length of the bundle tube 71 should be slightly larger than the length of the vertical section of the coalbed methane well, while the length of the guide solid tube 74 should be slightly larger than the length of the section to be fractured.

[0055] Furthermore, the other end of the bundle tube 71 is fixedly equipped with a coalbed methane well traveling assembly 9, and the four groups of fracturing agent pipes 72 and the four groups of fracturing agent and coalbed methane pipes 73 on this side of the bundle tube 71 are equipped with five groups of coalbed methane well separators 10;

[0056] The coalbed methane well separator 10 close to the bundle pipe 71 is fixed to the coalbed methane well traveling assembly 9, and the coalbed methane well separator 10 far away from the bundle pipe 71 is fixed on the side of the guiding solid pipe 74 away from the bundle pipe 71, and the other end of the group of coalbed methane well separators 10 is fixedly provided with the coalbed methane well traveling assembly 9, and the other side of the group of coalbed methane well traveling assembly 9 is fixedly provided with a well wall cleaner 11, and the two groups of coalbed methane well traveling assemblies 9 are arranged in a mirror image;

[0057] As a preferred embodiment, the coalbed methane well advancing component 9 will drive the other components to move along the coalbed methane well, and at the same time, the well wall cleaner 11 will clean the dust and the like on the well wall of the coalbed methane well by rotating. When the coalbed methane well separator 10 close to the bundle pipe reaches the edge of the coal seam to be fractured, the wellhead fixing component 8 clamps and fixes the coalbed methane well bundle pipe group 7, and at the same time, this group of coalbed methane well separators 10 seals the coalbed methane well, and another group of coalbed methane well advancing components 9 will continue to drive four groups of coalbed methane well separators 10 and well wall cleaners 11 along the The coalbed methane well moves forward, and the corresponding coalbed methane well separator 10 and the components thereon are fixed at the junction of different geological areas of the coal seam until the fixing work of all the coalbed methane well separators 10 is completed. Five groups of coalbed methane well separators 10 divide the coalbed methane well to be fractured into four closed spaces, and the corresponding fracturing agent tank 2 injects the corresponding fracturing agent into the corresponding closed space in the coalbed methane well and adjusts to the appropriate fracturing parameters. The fracturing agent carrying coalbed methane will be introduced into the fracturing agent separation and recovery tank 3 through the fracturing agent and coalbed methane pipe 73.

[0058] Further, the coalbed methane well advancing assembly 9 comprises:

[0059] The telescopic hydraulic sleeve 91 is fixedly assembled between the bundle pipe 71 and the coalbed methane well separator 10 close to the bundle pipe 71 or between the coalbed methane well separator 10 far from the bundle pipe 71 and the well wall cleaner 11;

[0060] An adjusting sleeve 93 is coaxially slidably sleeved on the telescopic hydraulic sleeve 91, and a compression spring 92 is fixedly arranged between the piston end of the telescopic hydraulic sleeve 91 and the adjusting sleeve 93;

[0061] The first connecting rod 94 is provided with multiple groups, all of which are rotatably mounted on the other side of the adjusting sleeve 93. The middle of the first connecting rod 94 is rotatably provided with a second connecting rod 95, and the other end of the second connecting rod 95 is fixedly mounted on the telescopic hydraulic sleeve 91, and the other end of each group of the first connecting rod 94 is provided with a self-driving wheel 96;

[0062] As a preferred embodiment, the compression spring 92 can be compressed by contracting the telescopic hydraulic sleeve 91, and at the same time, the adjusting sleeve 93 is pushed closer to the other end of the telescopic hydraulic sleeve 91, the angle between the first connecting rod 94 and the second connecting rod 95 will decrease, and the distance between the center axis of the self-driving wheel 96 connected to the first connecting rod 94 and the center axis of the telescopic hydraulic sleeve 91 will increase, so that the self-driving wheel 96 can contact the rock wall of the coalbed methane well when facing coalbed methane wells of different diameters. After contact, the hydraulic state of the telescopic hydraulic sleeve 91 is released, and under the action of the compression spring 92, the self-driving wheel 96 will always maintain the contact state, thereby moving, and the self-driving wheel 96 is built-in with a driving mechanism.

[0063] Further, the coalbed methane well separator 10 comprises:

[0064] A fixed shell 101 is fixedly mounted on the outside of the four groups of fracturing agent pipes 72 and the four groups of fracturing agent and coalbed methane pipes 73. The two sides of the fixed shell 101 are embedded with bundle tube locking ports 102, and a fixed closed air bag 103 is coaxially fixedly arranged on the outside of the fixed shell 101;

[0065] As a preferred embodiment, the fixed sealing airbag 103 will expand after reaching the designated position to seal the coalbed methane well, and the bundle tube locking port 102 will fill the gaps between the coalbed methane well separator 10 and the fracturing agent pipe 72 and between the fracturing agent and the coalbed methane pipe 73 without affecting the transmission of the four groups of fracturing agent pipes 72 and the four groups of fracturing agent and coalbed methane pipes 73, thereby achieving a sealing effect.

[0066] Furthermore, two groups of pipe clamping fixtures 104 are rotatably arranged on the inner wall of the fixed shell 101 of the four groups of coalbed methane well separators 10 close to the bundle pipe 71, and the two groups of pipe clamping fixtures 104 are arranged in a mirror image;

[0067] As a preferred embodiment, when a group of coalbed methane well separators 10 arrives at the corresponding position, the pipe clamping fixture 104 in the group of coalbed methane well separators 10 will be adjusted to a suitable position, and clamp and fix the fracturing agent pipe 72 and the fracturing agent and coalbed methane pipe 73 corresponding to the fracturing agent tank 2 and the fracturing agent separation and recovery tank 3 corresponding to the fracturing method corresponding to the coal seam geology, so that the fixed fracturing agent pipe 72 and the fracturing agent and coalbed methane pipe 73 serve the closed space formed by the group of coalbed methane well separators 10 and the subsequent coalbed methane well separators 10, and prevent them from continuing to move with the coalbed methane well advancing component 9.

[0068] Furthermore, a fixing sleeve 105 is fixedly provided on the inner wall of the fixing shell 101 of a group of coalbed methane well separators 10 away from the bundle pipe 71;

[0069] As a preferred embodiment, the fixed sleeve 105 is used to fix the fracturing agent pipe 72 and the fracturing agent and coalbed methane pipe 73 so that they can move synchronously with the coalbed methane well advancing assembly 9.

[0070] Furthermore, the friction force of the wall of the fixing sleeve 105 is smaller than the clamping force of the pipe clamping fixture 104;

[0071] As a preferred embodiment, the friction force of the wall of the fixed sleeve 105 is smaller than the clamping force of the pipe clamp fixture 104 , so that the pipe clamp fixture 104 can maintain a relatively fixed state after clamping the fracturing agent pipe 72 and the fracturing agent and coalbed methane pipe 73 , and separate from the fixed sleeve 105 .

[0072] A coalbed methane well production enhancement fracturing device and method, comprising the following steps:

[0073] S1. First, complete the drilling of the coalbed methane well through drilling equipment, then conduct geological testing on the part of the coalbed methane well that needs fracturing, and select the appropriate fracturing method according to different geological conditions;

[0074] S2. Select the appropriate number of devices according to the actual situation. The number of fracturing agent tanks 2, fracturing agent separation and recovery tanks 3, fracturing agent pipes 72, and fracturing agent and coalbed methane pipes 73 is equal to the number of selected fracturing methods, and the number of coalbed methane well separators 10 is one more than the number of selected fracturing methods;

[0075] S3. Take the selection of four fracturing methods as an example: the coalbed methane well bundle pipe group 7, two groups of coalbed methane well traveling components 9, five groups of coalbed methane well separators 10 and wellbore cleaners 11 are put into the coalbed methane well;

[0076] S4. The two groups of coalbed methane well traveling components 9 will drive the remaining components to move along the coalbed methane well, and the well wall cleaner 11 will clean the dust on the well wall of the coalbed methane well by rotating;

[0077] S5. When the coalbed methane well separator 10 near the bundle pipe 71 reaches the edge of the coal seam to be fractured, the wellhead fixing assembly 8 clamps and fixes the coalbed methane well bundle pipe group 7, and at the same time, the fixed sealing airbag 103 of the coalbed methane well separator 10 is inflated to seal the coalbed methane well;

[0078] S6. The pipe clamping fixture 104 in the group of coalbed methane well separators 10 is adjusted to a suitable position, and clamps and fixes the fracturing agent pipe 72 and the fracturing agent and coalbed methane pipe 73 corresponding to the fracturing agent tank 2 and the fracturing agent separation recovery tank 3 corresponding to the fracturing method corresponding to the coal seam geology;

[0079] S7. The two sets of bundle tube locking ports 102 in the group of coalbed methane well separators 10 will fill the gaps between the group of coalbed methane well separators 10 and the fracturing agent tubes 72 and the fracturing agent and coalbed methane tubes 73 without affecting the transmission of the four sets of fracturing agent tubes 72 and the four sets of fracturing agent and coalbed methane tubes 73, thereby achieving a sealing effect;

[0080] S8. Another set of coalbed methane well advancing components 9 will continue to drive four sets of coalbed methane well separators 10, well wall cleaners 11, the remaining three sets of fracturing agent pipes 72 and three sets of fracturing agent and coalbed methane pipes 73 and the guiding solid pipe 74 to advance along the coalbed methane well, and fix the corresponding coalbed methane well separators 10 and the components thereon at the junction of different geology of the coal seam until the fixing work of all coalbed methane well separators 10 is completed;

[0081] S9. Five groups of coalbed methane well separators 10 separate the coalbed methane well to be fractured into four closed spaces;

[0082] S10. Open the fracturing agent tank 2 to inject the corresponding fracturing agent into the corresponding closed space in the coalbed methane well, and adjust to the appropriate fracturing parameters. The fracturing agent carrying the coalbed methane will be introduced into the fracturing agent separation and recovery tank 3 through the fracturing agent and coalbed methane pipe 73;

[0083] S11. The fracturing agent separation and recovery tank 3 will separate the fracturing agent and the coalbed methane. The coalbed methane is input into other devices through the coalbed methane output pipe 6, and the fracturing agent is introduced into the corresponding fracturing agent tank 2 through the corresponding fracturing agent recovery pipe 5 for recycling. If necessary, a fracturing agent purifier can be set in the middle of the fracturing agent recovery pipe 5.

[0084] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coalbed methane well production enhancement fracturing device, characterized in that: include: A fixed frame (1) is provided with two groups of horizontal mirror images, and four groups of fracturing agent tanks (2) and four groups of fracturing agent separation and recovery tanks (3) are respectively fixedly mounted on the two groups of fixed frames (1), and fracturing agent well inlet pipes (4) are provided near the sides of the fracturing agent tanks (2) and the fracturing agent separation and recovery tanks (3), and the eight groups of fracturing agent well inlet pipes (4) are all arranged in a coalbed methane well bundle pipe group (7); The other sides of the four groups of fracturing agent separation and recovery tanks (3) are all connected to the coalbed methane output pipe (6), and the lower ends of the four groups of fracturing agent separation and recovery tanks (3) are all provided with fracturing agent recovery pipes (5), and the other ends of the fracturing agent recovery pipes (5) are connected to the corresponding fracturing agent tanks (2); The wellhead fixing assembly (8) is horizontally fixedly arranged on the ground just above the coalbed methane well.

2. A coalbed methane well production enhancement fracturing device according to claim 1, characterized in that: The eight groups of fracturing agent well inlet pipes (4) are all coiled in a coiled pipe device (12), and the coiled pipe device (12) is fixedly assembled on the side close to the corresponding fracturing agent tank (2) and the fracturing agent separation and recovery tank (3).

3. A coalbed methane well production enhancement fracturing device according to claim 1, characterized in that: The bundled pipe group (7) for a coalbed methane well comprises a bundled pipe (71), one end of which is fixed on a wellhead fixing assembly (8), a guiding solid pipe (74) is coaxially slidably arranged inside the bundled pipe (71), four groups of fracturing agent pipes (72) and four groups of fracturing agent and coalbed methane pipes (73) are arranged between the bundled pipe (71) and the guiding solid pipe (74), the four groups of fracturing agent pipes (72) and the four groups of fracturing agent and coalbed methane pipes (73) are distributed in a circumferential manner, and the relative fracturing agent pipes (72) and the fracturing agent and coalbed methane pipes (73) are respectively connected to the corresponding fracturing agent tank (2) and the corresponding fracturing agent well inlet pipe (4) of the fracturing agent separation and recovery tank (3).

4. A coalbed methane well production enhancement fracturing device according to claim 3, characterized in that: The other end of the bundle tube (71) is fixedly equipped with a coalbed methane well advancing assembly (9), and the four groups of fracturing agent pipes (72) and the four groups of fracturing agent and coalbed methane pipes (73) on this side of the bundle tube (71) are sheathed with five groups of coalbed methane well separators (10) outside; The coalbed methane well separator (10) close to the bundle tube (71) is fixed to the coalbed methane well advancing assembly (9), and the coalbed methane well separator (10) away from the bundle tube (71) is fixed on the side of the guiding solid tube (74) away from the bundle tube (71), and the other end of the group of coalbed methane well separators (10) is fixedly provided with a coalbed methane well advancing assembly (9), and the other side of the group of coalbed methane well advancing assembly (9) is fixedly provided with a well wall cleaner (11), and the two groups of coalbed methane well advancing assemblies (9) are arranged in a mirror image.

5. A coalbed methane well production enhancement fracturing device according to claim 4, characterized in that: The coalbed methane well advancing assembly (9) comprises: A telescopic hydraulic sleeve (91) is fixedly mounted between the bundle tube (71) and a coalbed methane well separator (10) close to the bundle tube (71) or between the coalbed methane well separator (10) far from the bundle tube (71) and a well wall cleaner (11); An adjusting sleeve (93) is coaxially slidably sleeved on the telescopic hydraulic sleeve (91), and a compression spring (92) is fixedly arranged between the piston end of the telescopic hydraulic sleeve (91) and the adjusting sleeve (93); The first connecting rod (94) is provided in multiple groups, and all of them are rotatably mounted on the other side of the adjusting sleeve (93). A second connecting rod (95) is rotatably mounted in the middle of the first connecting rod (94), and the other end of the second connecting rod (95) is fixedly mounted on the telescopic hydraulic sleeve (91), and the other end of each group of the first connecting rods (94) is provided with a self-driving wheel (96).

6. A coalbed methane well production enhancement fracturing device according to claim 4, characterized in that: The coalbed methane well separator (10) comprises: A fixed shell (101) is fixedly mounted on the outside of four groups of fracturing agent pipes (72) and four groups of fracturing agent and coalbed methane pipes (73), and bundle tube locking ports (102) are embedded on both sides of the fixed shell (101), and a fixed closed air bag (103) is coaxially fixedly arranged on the outside of the fixed shell (101).

7. A coalbed methane well production enhancement fracturing device according to claim 6, characterized in that: Two groups of pipe clamping fixtures (104) are rotatably arranged on the inner walls of the fixed shells (101) of the four groups of coalbed methane well separators (10) close to the bundled tubes (71), and the two groups of pipe clamping fixtures (104) are arranged in a mirror image.

8. A coalbed methane well production enhancement fracturing device according to claim 7, characterized in that: A fixing sleeve (105) is fixedly arranged on the inner wall of a fixing shell (101) of a group of coalbed methane well separators (10) away from the bundle pipe (71).

9. A coalbed methane well production enhancement fracturing device according to claim 8, characterized in that: The friction force of the wall of the fixing sleeve (105) is smaller than the clamping force of the pipe clamping fixture (104).

10. A coalbed methane well production enhancement fracturing device and method, which uses the coalbed methane well production enhancement fracturing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. First, complete the drilling of the coalbed methane well through drilling equipment, then conduct geological testing on the part of the coalbed methane well that needs fracturing, and select the appropriate fracturing method according to different geological conditions; S2. Select the appropriate number of devices according to the actual situation. The number of fracturing agent tanks (2), fracturing agent separation and recovery tanks (3), fracturing agent pipes (72), and fracturing agent and coalbed methane pipes (73) is equal to the number of selected fracturing methods, and the number of coalbed methane well separators (10) is one more than the number of selected fracturing methods; S3. Taking four fracturing methods as an example: a coalbed methane well bundle pipe group (7), two groups of coalbed methane well traveling components (9), five groups of coalbed methane well separators (10) and a well wall cleaner (11) are put into the coalbed methane well; S4. The two groups of coalbed methane well traveling components (9) will drive the remaining components to move along the coalbed methane well, and the well wall cleaner (11) will clean the dust on the coalbed methane well wall by rotating; S5. When the coalbed methane well separator (10) close to the bundle pipe (71) reaches the edge of the coal seam to be fractured, the wellhead fixing assembly (8) clamps and fixes the coalbed methane well bundle pipe group (7), and at the same time, the fixed sealing airbag (103) of the coalbed methane well separator (10) is expanded to seal the coalbed methane well; S6. The pipe clamping fixture (104) in the group of coalbed methane well separators (10) is adjusted to a suitable position, and clamps and fixes the fracturing agent tank (2) corresponding to the fracturing method corresponding to the coal seam geology and the fracturing agent separation recovery tank (3) corresponding to the fracturing agent pipe (72) and the fracturing agent and coalbed methane pipe (73); S7. The two groups of bundle tube locking ports (102) in the group of coalbed methane well separators (10) will fill the gaps between the group of coalbed methane well separators (10) and the fracturing agent tubes (72) and between the fracturing agent and the coalbed methane tubes (73) without affecting the transmission of the four groups of fracturing agent tubes (72) and the four groups of fracturing agent and coalbed methane tubes (73), thereby achieving a sealing effect; S8. Another group of coalbed methane well advancing components (9) will continue to drive four groups of coalbed methane well separators (10), well wall cleaners (11), the remaining three groups of fracturing agent pipes (72) and three groups of fracturing agent and coalbed methane pipes (73) and the guiding solid pipe (74) along the coalbed methane well, and fix the corresponding coalbed methane well separators (10) and the components thereon at the junction of different geological features of the coal seam until the fixing work of all coalbed methane well separators (10) is completed; S9. Five groups of coalbed methane well separators (10) separate the coalbed methane well to be fractured into four closed spaces; S10. Open the fracturing agent tank (2) and inject the corresponding fracturing agent into the corresponding closed space in the coalbed methane well, and adjust the appropriate fracturing parameters. The fracturing agent carrying the coalbed methane will be introduced into the fracturing agent separation and recovery tank (3) through the fracturing agent and coalbed methane pipe (73); S11. The fracturing agent separation and recovery tank (3) will separate the fracturing agent from the coalbed methane. The coalbed methane is input into other devices through the coalbed methane output pipe (6), and the fracturing agent is introduced into the corresponding fracturing agent tank (2) through the corresponding fracturing agent recovery pipe (5) for recycling. If necessary, a fracturing agent purifier can be set in the middle of the fracturing agent recovery pipe (5).

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