Search

CN-224228656-U - Coal seam multistage downward gas extraction drilling acidizing and fracturing device

CN224228656UCN 224228656 UCN224228656 UCN 224228656UCN-224228656-U

Abstract

The application relates to a coal seam multistage downward gas extraction drilling acidification fracturing device, which relates to the technical field of coal seam gas extraction and comprises a first transmission pipeline for conveying acidic liquid and a second transmission pipeline for conveying water, wherein the end part of the first transmission pipeline is provided with a first interface for connecting two adjacent first transmission pipelines, a supporting component is arranged at the joint of the two adjacent first transmission pipelines, the end part of the second transmission pipeline is provided with a second interface for connecting two adjacent second transmission pipelines, a plurality of compression-resistant bags are sleeved on the second transmission pipeline, the first transmission pipeline is sleeved on the compression-resistant bags, and a communication hole for injecting or discharging the acidic liquid into a drill hole is formed in the first transmission pipeline. The application has the effects of injecting acidic liquid into different layers as required, dissolving minerals, expanding cracks, improving the permeability of the coal seam, effectively resisting ground stress and fluid impact, and preventing dislocation, dislocation and leakage of pipelines.

Inventors

  • Su Chenlei
  • RAN PENG
  • WU PEILIN
  • WANG ZHIQIANG
  • SONG LULU
  • FAN CHAOJUN
  • JIANG XIAOFENG

Assignees

  • 山西潞安环保能源开发股份有限公司王庄煤矿
  • 辽宁工程技术大学

Dates

Publication Date
20260512
Application Date
20250704

Claims (8)

  1. 1. The utility model provides a coal seam multistage is to gas drainage drilling acidizing fracturing device, its characterized in that includes a plurality of first transmission pipeline (1) that are used for carrying acid liquid and a plurality of second transmission pipeline (2) that are used for carrying water, and the tip of first transmission pipeline (1) is equipped with first interface with two adjacent first transmission pipeline (1) are connected, and support assembly (11) are installed to the junction of two adjacent first transmission pipeline (1), and the tip of second transmission pipeline (2) is equipped with second interface (21) with two adjacent second transmission pipeline (2) are connected, the cover is equipped with a plurality of resistance to compression bags (3) on second transmission pipeline (2), first transmission pipeline (1) cover is established on resistance to compression bag (3), be equipped with on first transmission pipeline (1) and be used for to pour into or discharge acid liquid into in the drilling intercommunicating pore (12).
  2. 2. The multi-section downward gas drainage borehole acidizing and fracturing device for coal seams of claim 1, wherein the supporting component (11) comprises a first annular sleeve (111) and a second annular sleeve (112), a plurality of bolts (113) are connected to the first annular sleeve (111), nuts (114) are connected to the bolts (113), and the first transmission pipeline (1) is located between the first annular sleeve (111) and the second annular sleeve (112) to lock the first transmission pipeline (1).
  3. 3. The multi-section downward gas extraction borehole acidizing and fracturing device for coal seams according to claim 2, wherein the first annular sleeve (111) and the second annular sleeve (112) are provided with supporting rods (115), the supporting rods (115) are provided with lifting pieces (116), and the lifting pieces (116) are arranged in an arc shape.
  4. 4. The multi-section downward gas extraction borehole acidizing and fracturing device for the coal seam of claim 1, wherein one end of the first transmission pipeline (1) positioned outside the borehole is connected with a first liquid storage tank (4) for storing acidic liquid, and a first pump (5), a first flowmeter and a first pressure sensor are arranged between the first transmission pipeline (1) and the first liquid storage tank (4).
  5. 5. The multi-section downward gas extraction borehole acidizing and fracturing device for the coal seam of claim 4, wherein one end of the first transmission pipeline (1) positioned outside the borehole is provided with a reducing interface (13), and the reducing interface (13) is connected with the first pump (5).
  6. 6. The multi-section downward gas extraction borehole acidizing and fracturing device for the coal seam of claim 1, wherein one end of the second transmission pipeline (2) positioned outside the borehole is connected with a second liquid storage tank for storing water, and a second pump, a second flowmeter and a second pressure sensor are arranged between the second transmission pipeline (2) and the second liquid storage tank.
  7. 7. The multi-section downward gas drainage borehole acidizing and fracturing device for coal seams of claim 1, wherein a first connecting piece (31) is arranged on the compression-resistant bag (3) and is connected with the first transmission pipeline (1) through the compression-resistant bag (3), and a second connecting piece (32) is arranged on the compression-resistant bag (3) and is connected with the second transmission pipeline (2) through the compression-resistant bag (3).
  8. 8. The multi-section downward gas extraction borehole acidizing and fracturing device for the coal seam of claim 1 is characterized in that the input end and the output end of the first transmission pipeline (1) are both in conical arrangement.

Description

Coal seam multistage downward gas extraction drilling acidizing and fracturing device Technical Field The application relates to the technical field of coal seam gas extraction, in particular to a coal seam multistage downward gas extraction drilling acidification fracturing device. Background In the field of coal seam gas extraction, although a large number of cracks exist in a coal seam, carbonate minerals such as calcite, dolomite and the like are basically filled, so that the coal seam gas extraction is difficult, and carbonate minerals contained in coal can be dissolved by injecting acid liquor into a drill hole for acidizing and fracturing, so that a crack network in the coal is conducted, and the extraction difficulty of the coal seam gas is reduced. At present, as the length of a coal seam gas extraction borehole is longer, the conventional single-stage acid fracturing technology has the defects that the ground stress is unevenly distributed, so that acid liquid is easy to flow to a section with higher permeability and is difficult to flow to a section with low permeability, which is seriously filled in a fracture network, the target horizon is insufficient in acidification, the gas extraction efficiency is limited, meanwhile, in the downward long drilling process, the transmission pipelines are only connected through interfaces, dislocation or dislocation is caused between the transmission pipelines due to complex environments (such as ground stress and fluid impact) in the borehole, leakage is easy to occur, and the continuity of acid injection and sealing processes is difficult to ensure. Disclosure of utility model In order to solve the problem that the length of a coal seam gas extraction borehole is long, the acidification of a target layer is insufficient due to conventional acidification fracturing, and in the downward long borehole process, transmission pipelines are connected only through interfaces, and the complex environment in the borehole is easy to leak, the application provides a coal seam multistage downward gas extraction borehole acidification fracturing device. The application provides a multi-section downward gas extraction drilling, acidizing and fracturing device for a coal seam, which adopts the following technical scheme: The utility model provides a coal seam multistage is to gas drainage drilling acidizing fracturing device, is including the first transmission pipeline that is used for carrying acid liquid and the second transmission pipeline that is used for carrying water, the tip of first transmission pipeline is equipped with first interface with adjacent two first transmission pipeline connects, adjacent two support component is installed to the junction of first transmission pipeline, and the tip of second transmission pipeline is equipped with the second interface with adjacent two second transmission pipeline connects, the cover is equipped with a plurality of resistance to compression bags on the second transmission pipeline, first transmission pipeline cover is established on the resistance to compression bag, be equipped with on the first transmission pipeline and be used for injecting into or discharging acid liquid's intercommunicating pore in the drilling. By adopting the technical scheme, the double-pipe arrangement of the first transmission pipeline and the second transmission pipeline realizes the functional separation of acid liquid conveying and clear water conveying, is convenient for acidizing fracturing and cleaning operation in stages, is convenient for the quick connection of adjacent pipelines due to the arrangement of the first interface and the second interface, ensures the continuity of transmission, enhances the stability of the joint of the first transmission pipeline, and avoids dislocation or disjointing in a complex drilling environment. The pressure-resistant bag is sleeved on the second transmission pipeline, the pressure-resistant bag is sealed and isolated by water pressure, layered acidizing and fracturing is enhanced, ground stress and fluid impact in a drilled hole can be resisted, the second transmission pipeline is protected, on the other hand, buffer support is provided for the first transmission pipeline, the first transmission pipeline is provided with the communication holes, the opening positions of the communication holes can be controlled, multi-section layered acidizing and fracturing can be realized, acid liquor accurately acts on coal beds with different permeability, and the problem of uneven acid liquor distribution in the conventional technology is solved. Optionally, the support assembly includes first ring cover and second ring cover, be connected with a plurality of bolts on the first ring cover, be connected with the nut on the bolt, just first transmission pipeline is located first ring cover with between the second ring cover in order to lock first transmission pipeline. Through adopting above-mentioned technica