3D Fracture Propagation Simulation and Production Prediction in Coalbed
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摘要: 针对煤层气井的压裂特点和产出机理,综合应用流体力学、线弹性断裂力学、传热学、计算数学和软件工程等方面的知识,提出了煤层压裂裂缝三维延伸模型和产量动态预测模型,其中裂缝三维延伸模型考虑了煤层、上下遮挡层之间的地应力和岩石力学参数变化的影响,产量动态预测模型考虑了煤层气先解吸扩散后渗流入井的产出机理。在此基础上研制了煤层气井三维压裂优化设计软件,并通过实例计算验证了其实用性和可靠性。Abstract: In accordance with the fracturing and producing mechanism in coalbed methane well,and combining the knowledge of fluid mechanics,linear elastic fracture mechanics,thermal transfer, computing mathematics and software engineering,the three-dimensional hydraulic fracture propagating and dynamical production predicting models for coalbed methane well is put forward.The fracture propagation model takes the variation of rock mechanical properties and in-situ stress distribution into consideration.The dynamic performance prediction model takes the gas production mechanism into consideration.With these models,a three-dimensional hydraulic fracturing optimum design software for coalbed methane well is developed,and its practicality and reliability have been proved by example computation.
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Key words:
- coalbed /
- fracturing /
- three-dimensional fracture propagation /
- production predicting /
- desorption /
- diffusion
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