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In order to study the problem of fracture propagation at field scale of hydraulic fracturing and carbon dioxide fracturing in hot dry rock reservoir. In this study, a numerical model of fracture dynamic propagation coupled with thermo-hydraulic-mechanical (THM) processes is established based on the three-dimensional discrete element method. In this model, discrete fracture network (DFN) modeling is also considered. In the case study, the effects of different fracturing parameters and geological parameters are analyzed. The study found that the total fracture area is negatively correlated with the injection rate. But compared with hydraulic fracturing, the fracture area of carbon dioxide fracturing is less affected by the injection rate. The fracture area of carbon dioxide fracturing is 1.67 ~ 1.81 times of the total fracture area of hydraulic fracturing. The proportion of natural fractures activated by carbon dioxide fracturing is 1.38 ~ 1.54 times that of hydraulic fracturing.

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A Fracturing Model Coupled with THM Based on Three Dimensional Discrete Element Method: Case Study of a Hot Dry Rock Reservoir

  • 会议论文

  • 发表日期：

    2025年

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  • Zhiying Wu,
  • Yuting He,
  • Wuhao Guo,
  • Zhenhui Bi,
  • Xin Chang,
  • Lei Wang,
  • Yintong Guo

摘要

In order to study the problem of fracture propagation at field scale of hydraulic fracturing and carbon dioxide fracturing in hot dry rock reservoir. In this study, a numerical model of fracture dynamic propagation coupled with thermo-hydraulic-mechanical (THM) processes is established based on the three-dimensional discrete element method. In this model, discrete fracture network (DFN) modeling is also considered. In the case study, the effects of different fracturing parameters and geological parameters are analyzed. The study found that the total fracture area is negatively correlated with the injection rate. But compared with hydraulic fracturing, the fracture area of carbon dioxide fracturing is less affected by the injection rate. The fracture area of carbon dioxide fracturing is 1.67 ~ 1.81 times of the total fracture area of hydraulic fracturing. The proportion of natural fractures activated by carbon dioxide fracturing is 1.38 ~ 1.54 times that of hydraulic fracturing.