用逐步稳态替换法确定低渗油藏合理井距

摘要

以杨清立提出的非线性渗流连续模型及最新试验数据为基础,利用逐步稳态替换法确定低渗透油藏的合理井距,分析启动压力梯度和驱动压差对合理井距的影响.结果表明:启动压力梯度对合理井距有较大影响,启动压力梯度越大,合理井距越小;启动压力梯度较小时,增大驱动压差可以增大注采井距;启动压力梯度较大时,驱动压差的影响不大,需要采取压裂措施才能经济合理地开采低渗透油藏;与稳态法相比,该方法的计算结果更符合低渗透油藏开发的实际情况,可用于指导低渗透油田开发.%The reasonable spacing of low permeability reservoir was determined by means of series of steady state analysis based on the continuous model of non-linear flow proposed by Yang Qingli and the latest experimental data. And the impact of threshold pressure gradient and driving pressure difference on reasonable spacing was analyzed. The results show that the threshold pressure gradient strongly affects the reasonable spacing, the greater the threshold pressure gradient, the smaller the reasonable spacing is. When the threshold pressure gradient is small, the producer-injector spacing increases with driving pressure difference increasing. When the threshold pressure gradient is great, driving pressure difference has little impact on the reasonable spacing, and fracture treatments should be taken to develop low permeability reservoirs economically. Compared with steady state method, the results obtained by this method agree well with the practice of low permeability reservoir development, which can guide the development of low permeability oilfield.