长8油藏超前注水压力保持水平研究

超前注水是指注水井在采油井投产前投注,油井投产时其泄油面积内含油饱和度不低于原始含油饱和度,地层压力高于原始地层压力,并建立起有效驱替系统的一种注采方式,它正是针对特低渗透油层具有启动压力梯度及油层具有弹一塑性形变等特点,根据非达西流提出的改善这类储层开发效果的一项技术。现场实践证明,超前注水对于低渗透及特低渗透油藏更具有指导意义。针对长8油藏,应用油藏数值模拟技术,分析了不同超前注水量条件下的开发指标,使地层压力分别提高到原始地层压力的1.05倍、1.10倍、1.15倍、1.20倍,并与未实施超前注水利用天然能量开采方式下的开发指标进行了对比,结果表明,当注水量为1.03%PV时,地层压力保持水平为原始地层压力的1.10倍,长8油藏开发效果最佳。将为提高特低渗透油藏注水采油效果、制定油藏合理的超前注水开发政策提供理论依据和技术支撑,对提高长庆特低渗透油田油井产量,保证特低渗透油田开发效益最大化具有较好的指导意义。

Research on Pressure Maintenance in Advance Water-flooding of Chang 8 Oil Reservoir

Advance water-flooding is a injection-production method with effective displacement system.That is to say,the injection well should be put into injection before the oil well is put into production,and oil saturation should not be lower than initial oil saturation and formation pressure should be higher than the initial in the drainage area when oil well puts into production.According to the features of start-up pressure gradient and elastic-plastic deformation in the extremely low-permeability oil fomations...