低渗透油藏室内注空气驱油评价

Laboratory evaluation research for oil displacement by air injection in low permeability reservoirs

基于低渗透油藏注水开发的现实困难,世界各国都在积极探索提高原油采收率的新途径。国外和国内部分区块实验结果表明,注空气驱油具有一定可行性。对L油田N断块开展室内注空气驱油评价研究。设计三组驱油实验,分别采用水驱油和水驱后空气驱油的方案,考察压差、采收率、注入能力与注入倍数的关系。结果表明:该区块地层原油可以与空气发生低温氧化。第二组和第三组实验对比表明,改注空气后比同样水驱的采出程度大幅提高,空气驱油可行。

This paper describes a study prompted by the fact that, given the practical difficulties of the waterflood development in low permeability reservoirs, all countries in the world are working hard on new methods to enhance oil recovery. The experimental results of some blocks at home and abroad show that air injection is feasible. The study involves conducting indoor air injection displacement evaluation research into the N fault block of L oilfield, designing three groups of oil displacement experiment, and analyzing pressure difference, recovery ratio, injection capacity relationship of injection multiples using the program of water flooding and air injection after water flooding respectively. The results show that there is low-temperature oxidization reaction between oil and the oxygen in air in this block. Experimental com- parison between second group and third group reveals that the air injection boasts a significantly higher re- covery rate than waterflooding and is feasible.