3D Fracture Propagation Simulation and Pressure Decline Analysis Research for I-Shaped Fracture of Coalbed

After hydraulic fracturing, some treatments intended for production enhancement fail to yield predetermined effects. The main reason is the insufficient research about fracture propagation mechanism. There compelling evidence that I-shaped fracture, two horizontal fractures at junction of coalbed and cover/bottom layer, one vertical in have formed part after fracturing. Therefore, this paper aims simulation. A novel model derived on basis a three-dimensional (3D) model, coupling conditions are established based flow rate distribution bottom-hole pressure equality, respectively. Moreover, an associated PDA (pressure decline analysis post-fracturing) established. Both models complement with each other work together guide fracturing treatment. Finally, field case studied show proposed can effectively investigate simulate initiation/propagation decline.