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松软低透气性煤层水力压裂裂缝拓展模拟研究及优化
Simulation and Optimization of Hydraulic Fracturing Development in Soft and Low Permeability Coalbed
【摘要】 针对因传统水力压裂指向性较弱、压裂范围随机等因素而导致难以开采较薄且瓦斯等矿产资源丰富度较高储层的问题,以谢桥矿1361(3)底抽巷水力压裂为例,基于拓展有限元理论,运用Abaqus CAE软件建模并分析不同初始裂缝角度下裂缝的发育形式与有效半径,通过数值模拟与现场试验相结合的方式,研究不同角度下的裂缝发育规律。研究结果表明,水力压裂工程试验验证了裂缝的有效半径,并且与数值模拟分析结果相吻合;当初始裂缝角度α取值0°、10°时,裂缝倾向于X方向发育,最大增透半径为17.4m;当α取值12.5°时,存在理论最长裂缝;当α取值20°、30°、40°、50°、60°时,压裂液可在目标层内停留较长时间,最大增透半径为9.1m;当α取值70°、80°、90°时,裂缝发育将直接穿透目标层,最大增透半径为1.5m,较难对X方向进行大范围增透。该研究结果对较薄储层的矿藏资源开采有一定参考意义。
【Abstract】 In response to the problem of difficulty in mining thin and high abundance reservoirs of mineral resources such as gas due to factors such as weak directionality and random fracturing range of traditional hydraulic fracturing, taking the hydraulic fracturing of 1361(3) bottom extraction roadway in Xieqiao Mine as an example, based on the extended finite element theory, Abaqus CAE software was used to model and analyze the development form and effective radius of cracks at different initial crack angles. By combining numerical simulation with on-site experiments, the development law of cracks at different angles was studied. The research results indicate that the hydraulic fracturing engineering experiments have verified the effective radius of cracks and are consistent with numerical simulation analysis results. The cracks, at the initial crack angle α=0 ° and 10 °, tend to develop in the X direction, with a maximum transmittance radius of 17.4m and There is a theoretical longest crack at α=12.5 °. The fracturing fluid can stay in the target layer for a long time at α=20 °, 30 °, 40 °, 50 °, and 60 ° with a maximum transmittance radius of 9.1m respectively.and the development of cracks will directly penetrate the target layer at α=70 °, 80 °, and 90 °, with a maximum transmittance radius of 1.5m, making it difficult to achieve large-scale transmittance enhancement in the X direction. The research results have certain guiding significance for the mining of mineral resources in thinner reservoirs.
【Key words】 coalbed methane; hydraulic fracturing; XFEM; initial crack angle; antireflection radius;
- 【文献出处】 安徽理工大学学报(自然科学版) ,Journal of Anhui University of Science and Technology(Natural Science) , 编辑部邮箱 ,2023年03期
- 【分类号】TE377
- 【下载频次】21