3-D fracture propagation simulation and production prediction in coalbed

In accordance with the fracturing and producing mechanism in coalbed methan e well, and combining the knowledge of fluid mechanics, linear elastic frac ture mechanics, thermal transfer, computing mathematics and software engine ering, the three-dimensional hydraulic fracture propagating and dynamical p roduction predicting models for coalbed methane well is put forward. The fr acture 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. Wi th these models, a three-dimensional hydraulic fracturing optimum design so ftware for coalbed methane well is developed, and its practicality and reli ability have been proved by ex-ample computation.