a coal seam co 2 Preparation and high pressure fracturing gas permeation enhancement and replacement method
A gas and fracturing technology, applied in the field of gas permeability enhancement and replacement, can solve problems such as low efficiency of hydraulic fracturing in coal seams, and achieve the effects of reducing the harm of coal dust, preventing accidents and improving efficiency
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[0048] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.
[0049] In the technical field of anti-permeability and gas replacement of gas-containing coal seams in the coal mining industry, two methods are generally used in the prior art. The first type of hydraulic fracturing method is to pump high-pressure water into the coal seam borehole to cause cracks in the coal seam. However, due to the physical properties of water, most of the cracks will only be relatively large during the hydraulic fracturing process, and the cracks The distribution is very uneven. As a result, the local gas permeability of the coal seam is poor, and the gas is pumped after t...
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