CO2状态与各向异性对烟煤渐进破坏特征影响的实验研究

doi:10.13722/j.cnki.jrme.2021.0487

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摘要为探索CO2驱替煤层气开采工程中储层的力学特性，对烟煤试样分别开展不同压力(4，6，8和12 MPa)下的CO2吸附实验、巴西圆盘劈裂实验、低温氮吸附实验和断口分析，研究CO2状态与各向异性对烟煤渐进破坏力学响应的影响。结果表明，烟煤的巴西劈裂强度(st)和劈裂模量(ET)受CO2吸附作用影响均呈现先减小后增大的趋势，8 MP超临界态CO2吸附作用使得st与ET降低幅度最大，分别为49.8%，33.9%。受各向异性影响，3种类型烟煤试样st大小顺序为：Divider型＞Arrester型＞Short transverse型。随着CO2压力增大，烟煤的破坏特征呈现出由突然失稳到渐进失稳再到突然失稳的转变规律。同时，CO2吸附效应削弱了烟煤基质与层理面，导致各向异性烟煤的破坏轨迹随CO2压力增大而愈加复杂，可分为单一破坏、多源破坏和碎裂破坏轨迹3大类，并进一步地细划分为12个亚类。CO2与烟煤相互作用改变了烟煤比表面积、总孔体积、孔径分布均匀性。这种微细观结构的改变与其宏观力学特性有关，影响了烟煤的力学性质与破坏特征。研究结果可为CO2驱替煤层气开发工程中储层改造、稳定性评估及高效开采工艺探索提供一定的参考价值。

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	孙泽东1
	冯淦2
	宋选民1
	孟涛1
	3
	朱德福1
	霍昱名1
	王仲伦1

关键词 ：岩石力学, 煤层气开采, 烟煤, 超临界CO2, 力学特性, 层理

Abstract：In order to explore the mechanical properties of the reservoirs during the CO2 displacement coalbed methane exploitation process，CO2 adsorption experiments under different pressures(4，6，8，and 12 MPa)，Brazilian disc splitting experiments，low temperature nitrogen adsorption experiments and fracture analysis were carried out on bituminous coal samples. The influence of CO2 state and anisotropy on mechanical response of bituminous coal to progressive failure was studied. The results show that the Brazilian splitting strength(st) and modulus(ET) of bituminous coal decrease first and then increase under the influence of CO2 adsorption. Under 8 MPa supercritical CO2 adsorption，st and ET decrease by 49.8% and 33.9% respectively. The order of st of three types of bituminous coal samples is divider type followed by arrester type and short converse type. With increasing the CO2 pressure，bituminous coal shows a transformation law of failure characteristics from sudden instability to gradual instability and to sudden instability. At the same time，the CO2 adsorption effect weakens the matrix and the bedding plane of bituminous coal，which makes the failure path of anisotropic bituminous coal more complicated with increasing the CO2 pressure. The failure path can be divided into single failure，multi-source failure and fragmentation failure tracks，which can be further divided into twelve sub categories. The above-obtained results are due to the differences of CO2 adsorption，organic matter extraction，dissolution and compression under different phase states and pressures as well as the corrosion of CO2 acid fluid. The specific surface area，the total pore volume and the pore size distribution uniformity of bituminous coal are changed by the interaction of CO2 and bituminous coal. The change of the micro structure is related to the macro mechanical properties，which affects the mechanical properties and failure characteristics of bituminous coal. The research results can provide certain reference value for reservoir reconstruction，stability evaluation and exploration of high-efficiency production technology in CO2 displacement coalbed methane development project.

Key words： rock mechanics coalbed methane exploitation bituminous coal supercritical CO2 mechanical properties bedding

引用本文:

孙泽东1，冯淦2，宋选民1，孟涛1，3，朱德福1，霍昱名1，王仲伦1. CO2状态与各向异性对烟煤渐进破坏特征影响的实验研究[J]. 岩石力学与工程学报, 2022, 41(1): 70-81.
SUN Zedong1，FENG Gan2，SONG Xuanmin1，MENG Tao1，3，ZHU Defu1，HUO Yuming1，WANG Zhonglun1. Effects of CO2 state and anisotropy on the progressive failure characteristics of bituminous coal：an experimental study. , 2022, 41(1): 70-81.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0487 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I1/70

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