Low-permeability gas-fusion three-technology-integrated ground gas control method
A low air permeability and surface technology, applied in drilling equipment and methods, mining fluids, earthwork drilling and mining, etc., can solve problems such as single crack direction, small coal seam fracture volume, and inability to achieve homogenization of fracturing
Pending Publication Date: 2021-09-24
RENQIU NORTH CHINA OILFIELD RELIANCE IND
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[0004] To sum up, conventional methods can cause coal seam fracture volume to be small, and the direction of the fracture is single, the scale of the fracture is small, and the fracturing blind area is prominent. Goals for quick explanation and release
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[0019] Such as Figure 1 to Figure 4 As shown, a ground gas control method integrating three technologies with low air permeability includes the following steps: Step 1. Put the multi-level and multi-directional ultra-high pressure and ultra-length horizontal drilling device into the coal seam position to be operated in the vertical well; step 2. Use the ground horizontal drilling device to perform hydraulic perforation drilling on the operating coal seam in multiple layers in depth and in multiple directions horizontally to form a honeycomb horizontal well network in the target coal seam; Step 3. Take the landing point of the vertical well in the coal seam as the center, Arrange spider web-like microseismic monitoring points in a range greater than 3 times the area of the coal seam to be fractured; step 4, assemble large-scale fracturing devices on the ground, and perform fracturing operations under the guidance of microseismic monitoring.
[0020] Specifically, in step 2, ...
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The invention discloses a low-permeability gas-fusion three-technology-integrated ground gas control method. The method comprises the following steps that 1, a multi-layer and multi-direction ultrahigh-pressure and ultra-long horizontal drilling device is placed into a to-be-operated coal seam position of a vertical well; 2, a ground horizontal drilling device is used for conducting hydraulic hole breaking drilling on the operation coal seam in the multi-layer and multi-direction depth and transverse direction, and a target coal seam honeycomb type horizontal well network is formed; 3, the falling point of the vertical well in the coal seam serves as the center, and spider web type micro-seismic monitoring points are arranged in the range, three times larger than the fractured coal seam area, of the corresponding ground; and 4, a large-scale fracturing device is combined on the ground, and fracturing operation is conducted under the guidance of micro-seismic monitoring. According to the method, three-dimensional homogenization full coverage of the controlled coal seam area can be achieved, fracturing blind areas are eliminated, coal seam crack homogenization, rapid gas analysis and smooth release channel are achieved, the purposes of preventing gas outburst and improving the gas extraction efficiency are achieved, and the underground coal mining production safety is improved.
Description
technical field [0001] The invention relates to the technical field of coal mine gas control, in particular to a ground gas control method integrating three technologies with low air permeability. Background technique [0002] At present, for the treatment of gas in thin coal seams, vertical drilling is mostly used for ground operations, and then perforation is performed in the coal seam of the well hole, followed by fracturing. During fracturing, the high-pressure water enters the coal seam from the wellbore through the perforated pores, destroys the coal seam, increases the scale of coal seam cracks around the drilling hole, and increases the precipitation and release of gas in the coal seam. However, due to the short perforation length (about 1m) of conventional perforation, hydraulic fracturing fracture propagation is easily affected by the stress concentration around the vertical well and the horizontal ground stress. The formation of fracture areas with stress as the ...
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Login to View More IPC IPC(8): E21B7/04E21B43/26E21B49/00
CPCE21B7/046E21B43/26E21B49/00
Inventor 刘存玉张志文孟宪营郝永军付京斌张瑞
Owner RENQIU NORTH CHINA OILFIELD RELIANCE IND