油藏水力压裂区域分解模拟算法

DOMAIN DECOMPOSITION SIMULATION METHOD FOR HYDROLIC FRACTURING AREA OF RESERVOIR/

由于压裂裂缝能增加地层的非均质性，因此，选用适当的数学模型和算法是提高模拟效果和计算精度的关键。将区域分解算法与黑油模型相结合，对水力压裂后形成的裂缝油藏进行了精细的模拟计算，通过计算渗透率的大小来描述裂缝的几何尺寸和方向。同时考虑到生产过程中裂缝导流能力会发生变化，采用了指数递减的方法对裂缝导流能力进行综合处理。模拟计算表明，运用该算法能较好地描述裂缝。本方法可用于对水力压裂油藏进行长期生产动态的计算和预测。

The proper mathematical models and algorithm can improve the simulation effect and precision of calculation. Combination of a domain decomposition method with black oil model is used to simulate the reservoir fractures created by hydraulic fracturing. The geometry and orientation of hydraulic fractures can be conducted with permeability. In the mean while, variation of capability of fractural diversion is considered during the production, so it may be handled generally in the way of exponential decrease by degrees. Simulation and calculation show that this method is capable for the fine description and calculation of fracture. The method can be used to simulate and predict the producing in a long period for the reservoir fractures created by hydraulic fracturing.