整体压裂裂缝导流能力与储层渗透率匹配关系研究

Study on the Relationship Between Fracture Conductivity and Reservoir Permeability of Integral Fracturing

针对低渗透油藏存在非达西渗流的问题,建立了整体压裂三维油水两相油藏和裂缝系统的数学模型,并采用有限差分法进行求解.利用建立的数学模型,针对不同储层渗透率级别,研究裂缝导流能力对油井产能的影响.结果表明:在各级储层渗透率级别下,随着裂缝导流能力的增加,采油强度逐渐增加,但增加的幅度越来越小.在此基础上,引入采油强度变化率的概念,确定了不同储层渗透率级别下裂缝导流能力与采油强度变化率的关系,进而得到不同储层渗透率级别下的最佳裂缝导流能力.为合理、高效开发低渗透油藏提供技术支持与保障.

A three-dimensional mathematical model of oil-water two phase for integral frac- turing has been established in this paper, which considered the effect of non-darcy, and the model was sloved by the finite difference method. By using of the mathematical model, the impact of fracture conductivity on the productivity has been analyzed, which considered lev- els of reservoir permeability. The results show, as the fracture conductivity increases, the oil production iIltension increases, but the increased amplitude decreases. On this basis, the concept of oil production intension increasing rate was introduced, and the impact of fracture conductivity on oil production intension increasing rate has been determined, so the optimal fracture conductivity which matched with reservoir permeability were obtained. The study has important guiding significance to the rational and efficient development of low permeability reservoirs.