摘要
针对中原油田实施“水质改性技术”后其注入水已由弱酸性变为弱碱性(pH≥8.0)和马寨卫95块油藏矿化度及Ca2+、Mg2+含量高、原油酸值低的特点,提出了在改性注入弱碱水中复配抗盐性表面活性剂等实施弱碱水复合驱提高油层采收率的观点。通过表面活性剂在弱碱水中溶解性及其复合体系油水界面张力的研究;确立了适用于卫95块油层生产条件的复合驱配方体系。驱油实验表明,JJ867、JJ869两种复合驱配方体系可分别提高采收率9.3%和14.3%.
In light of the fact that following implementation of water quality improvement technology,water injected in oilfield has become alkalescent water(pH≥8.0)from slight acidic water,Mazhai Wei-95Block reservoir is of high salinity,Ca 2+ ,Mg 2+ con-tents and low acid value in Zhongyuan oilfield,this paper presents a concept of alkalescent water compound flooding for EOR,adding salt-resisting surfactant into injected alkalescent water.By testing resolvable property of the surfactant in alkalescent water and oil-water interfacial tension in compound system,two compound flooding systems (JJ867and JJ869)suitably applied in Mazhai Wei-95Block reservoir production conditions are prepared.The oil displacement experiment shows that using these two systems can get incremental oil recovery factors of9.3%and14.3%,respectively.
出处
《新疆石油地质》
CAS
CSCD
2003年第5期438-440,共3页
Xinjiang Petroleum Geology
