A Numerical Study on Interference Between Different Layers for a Layer-By-Layer Hydraulic Fracture Procedure

摘要

A three-dimensional (3D) solid-fluid coupling model is proposed with the well-known science and engineering analysis software ABAQUS for reservoirs of multi-thin layered pay zoon with low permeability. The cohesive element based on damage mechanics is used for describing fluid flow through fractures and rock crack propagations. Self-developed subroutines are incorporated into ABAQUS for considering viscosity and leak off coefficient of proppant-laden fluid as well as pressure applied on the proppants in the fracture(s) already constructed in preceding fracture step(s). The layer-by-layer fracturing process of a vertical well in Daqing Oilfield of China and interference between different layers are simulated with the model. The numerical results are well coincident with the corresponding data measured in the field. The effects of layer's spacing on fracture results are studied.