低渗压敏双重孔隙介质油藏合理产能研究

Study on Reasonable Capacity of Low Permeability and Pressure Sensitive Dual Porosity Reservoir

针对低渗透油藏在开发过程中存在非达西流和压力敏感效应的特征,在综合考虑启动压力梯度影响及裂缝系统渗透率、裂缝系统孔隙度、基岩系统渗透率、基岩系统孔隙度随压力变化的基础上,建立了低渗双重孔隙介质油藏非线性平面径向产能渗流模型,并对模型进行了数值求解。分析了启动压力梯度、压力敏感系数、生产压差等参数对产能的影响。研究结果表明,对于低渗压敏油藏的开发要综合考虑启动压力梯度、岩石的强应力敏感性、生产压差等因素。研究成果对于低渗压敏油藏的开发有一定的指导意义。

For low permeability reservoirs,of non-Darcy flow and pressure sensitive effect characteristics existing in the development process,on the basis of comprehensively considering start-up pressure gradient effect and fracture permeability,fracture porosity,bedrock systems permeability,porosity of rock system changing with pressure,the nonlinear radial seepage capacity mode of dual porosity of low permeability oil reservoir is established,and it is solved numerically. The start-up pressure gradient,pressure sensitive coefficient,production pressure difference,such as well spacing parameter＇s influence on the capacity are analyzed. The research results show that the pressure sensitive low permeability oil reservoir development to comprehensive consideration of start-up pressure gradient and rock strong stress sensitivity,reasonable production pressure difference,the reasonable well spacing and other factors. Research results for pressure sensitive low permeability oil reservoir development has certain guiding significance.