Strategic conception and research progress of methane in-situ deflagration fracturing technology in shale reservoirs
Shale gas is generally stored in dark mudstone,high-carbon mudstone and other gas-producing rocks in adsorbed and free states.It is a clean and efficient energy resource.Com-pared with conventional natural gas reservoirs,shale gas reservoirs generally have low porosity and low permeability.Using fracturing technology to improve shale gas recovery rate is a key research direction for China's energy development during the 14th Five-Year Plan period.This paper proposes an innovative in-situ methane deflagration fracturing technology for shale reser-voirs.This technology utilizes the in-situ desorbed methane gas and injected combustion-assis-ting agents to cooperatively deflagrate and generate high-temperature and high-pressure gas to impact and fracture the shale reservoir,creating 3D fracture networks to provide efficient mi-gration pathways for shale gas.The paper comprehensively analyzes the conception and feasi-bility,key scientific issues,and main research directions of the in-situ methane deflagration fracturing technology.It includes three key research contents:the in-situ synergistic ignition mechanism and pressure wave propagation characteristics of methane-combustion assisting a-gent,the transient impact dynamics response and control mechanism of methane deflagration on wellbore media,and the multi-stage pulsed deflagration fracturing for hierarchical 3D frac-ture network construction and evaluation technologies.These basically cover the latest progress in the current theoretical and technical research on methane in-situ deflagration frac-turing.The study believes that the methane in-situ deflagration fracturing method does not re-quire a lot of water and fracturing fluids,nor does it involve the ground transportation and un-derground placement and mixing of explosives.Its safety,economic and environmental advan-tages are very significant.It is a forward-looking and revolutionary technology that will help a-chieve innovative breakthroughs in China's shale gas development technologies.
deep shale reservoirmethane in-situ combustion and explosioncombustion and explosion fracturing theorycombustion and explosion fracturing technology
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