Strategic conception and research progress of methane in-situ deflagration fracturing technology in shale reservoirs
ZHAI Cheng
QU Zhanqing
DENG Shouchun
SUN Weifu
LUO Ning
WANG Yu
LIU Ting
GUO Tiankui
WU Feipeng
LIU Jing
SONG Zhengchang
Chen Shangbin
YANG Wei
CAI Chengzheng
Abstract：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.
Keywords：deep shale reservoirmethane in-situ combustion and explosioncombustion and explosion fracturing theorycombustion and explosion fracturing technology
Publication Date：2024-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：21( 435-455 )