煤层气采收诱发储层沉降及应力演化的三维模型数值模拟

doi:10.13722/j.cnki.jrme.2022.0640

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摘要基于孔隙弹性介质假设，建立煤层气采收过程中应力–应变–解吸–扩散–渗流全耦合数值方程，通过离散裂隙网络方法构建包含天然垂直裂隙和水压裂隙的三维煤层几何模型，并采用COMSOL和有限元方法定量研究煤层气采收过程诱发的储层沉降及应力演化。模拟结果发现：(1) 储层顶面沉降集中在裂隙的两侧，其沉降差异导致天然裂隙发生垂向位错，最大可达2 mm/a；(2) 天然裂隙附近区域的应力分布具有第二和最小主应力明显变小，且最小主应力逐渐由压应力转变为拉应力的特征，拉应力可达3 MPa。基于修正的Morris筛选法，分析煤层气采收过程中影响储层位错和应力演化的主要因素。建议煤层气采收过程由沉降导致的灾害风险较小，但是仍需注意由于采收过程导致的储层天然裂隙位错及其附近区域应力大幅降低进而诱发地震和储层局部失稳破坏等次生灾害的可能性。

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	朱煜珣1
	刘金锋1
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关键词 ：岩石力学, 煤层气, 煤层沉降, 应力演化, 多场耦合, 三维离散裂隙网络数值模型, 有限元法

Abstract：In this contribution，we developed a numerical model for describing a coupled effect of stress-strain-sorption-diffusion-permeability on evolution of deformation and internal stress in coal seams during coalbed methane(CBM) recovery，assuming that coal behaves as a poroelastic media. Three-dimensional discrete fracture network of a coal seam was first constructed using COMSOL，consisting of natural and hydraulic fractures. On this basis，we quantitatively determined the development of subsidence and internal stress of the constructed coal seam，using our proposed numerical model，given proper parameter values. The results indicate，that：(1) subsidence mainly occurred on the top of the coal seam，which was located near the both sides of fractures，resulting in a vertical dislocation along the natural fractures and the dislocation rate can be up to 2 mm per year. (2) Both the intermediate and minimum principal stresses in the area near the natural fractures decreased significantly，while the minimum principal stress exhibited a transition from compression to tensile，which can reach to 3 MPa. In addition，parameter sensitive analysis was performed to determine the main factors controlling CBM recovery induced dislocation and stress evolution. By the research we suggests that during CBM recovery，deformation and stress drops around the natural fractures should be paid more attentions as it may cause local damage and even earthquake，though the CBM recovery induced subsidence is relatively small.

Key words： rock mechanicsc oalbed methane coalbed subsidence stress evolution stress-strain-sorption-diffusion-permeability coupling three-dimensional discrete fracture network finite element method

引用本文:

朱煜珣1，刘金锋1，2，3. 煤层气采收诱发储层沉降及应力演化的三维模型数值模拟[J]. 岩石力学与工程学报, 2023, 42(S1): 3293-3308.
ZHU Yuxun1，LIU Jinfeng1，2，3. Three-dimensional numerical simulation for estimating subsidence and stress evolution in coal seams during coalbed methane recovery. , 2023, 42(S1): 3293-3308.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0640 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3293

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