特低渗透油藏合理井距确定新方法

注采井距是影响特低渗透油藏开发效果的关键，目前主要根据渗透率和启动压力梯度大小来确定。阐述了这种方法的局限性，根据物理模拟实验分析了启动压力梯度和应力敏感系数的变化规

A NEW METHOD FOR DETERMING REASONABLE WELL SPACING IN ULTRALOW PERMEABILITY RESERVOIRS

To ultralow permeability reservoir,the key point of development effectiveness is producerinjector spacing,at the present,it is determined by means of permeability and threshold pressure gradient(TPG).In this paper,its restriction is illustrated,the change law of TPG and stress sensitivity factor analyzed according to physic simulation experiment,and its expression regressed with permeability as variable,at the same time,mathematical model of nonlinear flow in porous media built.A new method for determing reasonable well spacing in ultralow permeability reservoir is presented based on the model and superposition theory.A new methord is presented to extract reasonable injectorproducer spacing in ultralow permeability reservoir,by this method,not only reservoir permeability and injectionproduction pressure difference can be considered,but also fluid viscosity,expected production,TPG and stress sensitivity.Finally,relevant theory chart board is convenient for field application.