A hydraulic fracturing and methane in-situ combustion explosion synergistic fracturing enhancement method

Abstract

The invention relates to a hydraulic fracturing and in-situ methane explosion synergistic fracturing and anti-permeability method, which is suitable for the exploitation of shale gas reservoirs. Firstly carry out horizontal drilling construction in the area to be constructed, and then use concentrated energy perforation to create fractures around the wall of the horizontal drilling hole; use hydraulic fracturing to continue to expand the gaps around the horizontal drilling hole, discharge the fracturing fluid and perform methane Drainage; when the methane gas is reduced, perform in-situ detonation and fracturing on the methane participating in the horizontal borehole; after detonation, continue to expand the gap in the horizontal borehole so that the methane continues to seep out, and then continue to drain; repeated combustion Explosive fracturing and drainage operations, so as to realize the synergistic fracturing and permeability enhancement of combustion and explosion, which greatly enhances the exploitation effect of shale gas. The method is reasonable in design and highly feasible in construction operation, and is suitable for fracturing stimulation of unconventional oil and gas reservoirs such as shale gas reservoirs, coalbed gas reservoirs, and tight sandstone gas reservoirs.

Description

technical field [0001] The invention relates to a fracturing and anti-permeability method, and is especially suitable for a hydraulic fracturing and methane in-situ combustion and explosion synergistic fracturing and anti-permeability method used in the exploitation of shale gas reservoirs. Background technique [0002] Shale gas refers to a kind of unconventional natural gas that exists in organic-rich mud shale and its interlayers in an adsorbed, free or dissolved state, and is called the three major unconventional gas reservoirs together with coalbed methane reservoirs and tight sandstone gas reservoirs , whose main component is methane, mixed with ethane and propane, has the characteristics of long mining cycle, cleanness and high efficiency, and has become one of the best alternative energy sources for coal in the process of industrial development. my country is rich in shale gas resources, with recoverable resources reaching 36.1 trillion m 3 , the efficient developme...

AI Technical Summary

Problems solved by technology

High-energy gas fracturing mainly uses the high-pressure gas generated by the explosion of gunpowder (such as fast-curing liquid explosive) or rocket propellant (such as unsymmetrical dimethyl hydrazine) to fracture the rock mass, creating micro-cracks in the reservoir, which has the characteristics of low cost and low pollution , but there are also problems such as poor safety of pyrotechnics, small scale of crack expansion, etc.

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