根据长庆裂缝性低渗透油藏的储层特点,利用特低渗透大型露头岩样低压物理模拟实验系统,系统研究了不同排距、不同穿透比对矩形井网开发效果的影响.实验中测量了驱替达到稳定时模型的压力分布和各采出井的采液速度.根据小岩样非线性渗流曲线将模型划分为不流动区、非线性区和拟线性区,提出用压力系数来评价裂缝性特低渗透油藏的有效开发程度.研究结果表明,增大驱替压差、减小排距、增加穿透比可以增大矩形井网的压力系数,提高采出井采液速度.%The paper studies the influence of different row space and different penetration ratio on the development efficiency with rectangular well pattern based on the low permeability fracture reservoir characteristics of Changqing Oilfield by using physical simulation experiment system under low pressure for large scale of outcrop core samples with extremely low permeability. Pressure distribution when drainage is stable and liquid production rate of each production well are measured in the experiment. Based on the nonlinear permeable flow curves of small cores, the models are classified into 3 regions, namely, non - flow region, nonlinear region and pseudo linear region and it is raised that it is pressure coefficient that can evaluate the effective development percentage of extremely low permeability fracture reservoirs. The study shows that the increase in drainage pressure, the decrease in row space and the increase in penetration ratio can increase the pressure coefficient of rectangular well pattern, thus increasing the liquid production rate of production wells.
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