摘要
对于高含水中后期油藏、注水困难的强水敏油藏和特低渗透油藏,注天然气开采已成为提高原油采收率的重要技术手段之一。鉴于以往注气混相驱的良好效果,在混相压力条件下,设计了3种长岩心注入工艺实验,分析了在混相压力条件下不同驱替方式提高采收率的影响因素及其作用机理。结果表明:在混相条件下,连续气驱、先水驱后气驱和交替水注入3种实验的最终采收率分别为66.7%、65.8%和58.7%,即使混相压力是在20MPa下非混相连续气驱也能达到58.2%。由此可知在大庆榆树林地区采用注气提高采收率在理论上是可行的。
For late stage reservoirs with high water cut,the reservoirs with strong water sensitivity and the reservoirs with low permeability,it is one of the important ways for gas flooding to improve oil recovery.Considering good results of previous miscible displacements,three kind of long core tests are designed.The effects and mechanisms of different displacements on enhancing oil recovery are analyzed in this paper.Results show that final oil recovery of continuous gas flooding,gas flooding after water flooding and WAG are 66.7% .65.8%和58.7% differently in miscible pressure, and that of continuous gas flooding even reach 58.2% in 20MPa which is immiscible pressure. This paper draws a conclusion that it is feasible for Yushulin reservoir in the city of Daqing to use gas flooding to improve oil recovery in the theory.
出处
《重庆科技学院学报（自然科学版）》
CAS
2009年第5期5-7,32,共4页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
