轻质油藏注富气驱提高采收率室内研究  

Laboratory Study on Enhanced Oil Recovery by Enriched-gas Flooding in Light Oil Reservoirs

作　　者：敖文君 赵仁保[1] 杨晓盈 王锐[2] 周宇[2] 

机构地区：[1]石油工程教育部重点实验室(中国石油大学(北京)),北京102249 [2]中国石化石油勘探开发研究院采收率所,北京100083

出　　处：《石油天然气学报》2014年第9期163-166,170,共5页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(51274217)

摘　　要：高含水中后期油藏、注水困难的强水敏油藏和低渗透油藏,注水无法有效提高其采收率,为了实现油藏的高效开发与继续稳产等问题,进行了注富气驱提高采收率室内研究。由于烃气具有油藏原油的某些特性,注入时不伤害地层,已成为提高其原油采收率的重要技术手段。试验对所配制的原油进行了高压物性分析与长细管驱替试验。室内研究结果表明,随着注入富气摩尔分数的增加,原油泡点压力升高,黏度降低、膨胀能力增大,原油的物性可以得到很好的改善,同时对于试验的轻质油藏,富气驱的最小混相压力为34.74MPa,非混相驱虽然可以很大程度提高原油采收率,但与混相驱相比,注入富气量多,周期更长。采用富气混相驱不仅可以很好地改善原油物性,也可以进一步提高原油采收率。For low permeability reservoir and the strong water sensitive reservoir,water injection was difficult at the mid-late stage in high water-cut reservoirs and it was hard to improve oil recovery by waterflooding.For high effective development of the reservoir and sustainable stable production,a laboratory study was carried out for enhancing oil recovery by enriched-gas flooding.Because hydrocarbon gas had some characteristics of crude oil in reservoir,it had no damage to the formation in injection,thus it has become the major means of improving oil recovery.A high pressure physical property analysis and a long slime tube displacement test were performed on the prepared crude oil.The result of laboratory study indicates that with the increase of mole fraction of enriched-gas injection,the bubbling-point pressure of crude oil increases and its viscosity decreases,its expansion capacity increases,thus the physical property of the crude oil can be better improved.At the same time,for the tested light oil reservoir,the minimum miscible pressure of enriched-gasflooding is as high as 34.74 MPa.Although non-miscible displacement can greatly enhance oil recovery,compared with miscible displacement,it needs much more gas and the injection interval is longer.The enriched-gas flooding can better improve the physical property of crude oil and it also can further improve crude oil recovery.

关 键 词：富气驱 高压物性参数 混相驱 采收率 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]