定边低渗油藏表面活性剂体系实验研究及方案设计

针对定边低渗油田注水开发中后期水驱油效率变低、注水开发效果变差的问题,开展了表面活性剂驱油技术研究。通过室内实验优选出表面活性剂HB-DB-1体系,该体系在0.2%质量分数、0.3 PV注入体积条件下可提高采收率11.1%,并可降低驱替压力。优选出试验井组HK17A,编写井组现场试验方案,预计井组可提高采收率2%~3%。

Experimental research and schematic design of surfactant system in ultra-low permeability reservoir of Dingbian oilfield

Aiming at the problems occurred in middle-late development period of low permeability reservoir in Dingbian oilfield,such as low oil displacement efficiency and poor development effect of water flooding,the research on surfactant oil displacement technology was carried out.Through indoor experiments,the HB-DB-1 surfactant system was selected out,which could enhance oil recovery rate of 11.1% under the conditions of 0.2% concentration and 0.3PV injection volume,and it could also reduce the displacement pressure.In the end the testing well group HK17 A was optimized and the preparation of field test program was expected to improve the recovery rate by 2% ~ 3%.