人工裂缝对低渗透油田开发的影响研究

压裂技术是低渗透油田开发的一项主要的增产措施。文章利用数值模拟的方法，计算了低渗透油田面积注水条件下存在不同人工裂缝时的开发效果，分析了低渗透油田压裂后不同裂缝方位、不同裂缝导流能力对开发效果的影响，同时对比了注采井同时压裂和注水井压裂时的采出程度等开发指标。计算结果表明：正方形五点注采系统注水井压裂时，裂缝方位不同开发效果不同，裂缝方位与注水井排平行时驱替效果较好；裂缝导流能力并不是越高越好，存在最佳值；对注水井和采油井同时压裂时，采出程度高，在计算参数范围内，几乎是同条件注水井压裂时的两倍。在低渗透油田开发时，应合理的设计人工裂缝以改善开发效果、提高原油采收率。

INFLUENCE OF CREATED FRACTURE ON LOW PERMEABILITY RESERVOIR DEVELOPMENT

Fracturing is a major measurement to enhance oil recovery. Using the numerical simulation method, the influence of fracture orientation and conductivities on the efficiency of low permeability reservoirs development was discussed after hydraulic fracturing, and the recovery percent of reserves and other development indexes under different fracture conditions were contrasted. The results show that the displacement efficiency is better when the fracture orientation is same as that of water-injection wells and the fracture conductivity has an optimal value. It is helpful to enhance the development efficiency when the water-injection wells and the production wells are fractured simultaneously. The recovery percent of reserves is two times as that water-injection wells are fractured. In low permeability reservoir development, the design of reasonable man-made fracture can enhance the development efficiency.