超深稠油泡沫驱泡沫体系优选

Optimization of Foam System Used for Foam Flooding in Ultra Deep Heavy Oil Reservoir

为解决鲁克沁油田中区超深层稠油油藏非均质性严重、水驱开发效果差的问题,利用室内实验和矿场试验,开展了空气泡沫驱技术研究。对泡沫体系的发泡性、稳泡性、抗盐性和驱油效果等性能进行了系统的评价研究,对发泡工艺进行了验证试验。研究结果表明,XHY-4型起泡剂在高温高盐(80℃、160000 mg/L)条件下发泡率大于600%,半衰期大于600 s,岩心驱替实验提高采收率大于15%。氮气泡沫矿场试注表明,气液交替注入可以在地层中形成泡沫,对水流优势通道形成有效封堵,起到降水增油的效果。试注试验的成功,为鲁克沁油田超深层稠油油藏开展泡沫驱矿场试验提供了有力的技术支撑。

In order to resolve the problem that the heterogeneous is serious and the effect of water flooding is poor of ultra heavy oil reservoir in Lu-keqin oil filed,through the laboratory experiment and field experimentation,the foam ability,stability,salt-resistance and displacement effect of foam system was researched,and the foaming process was also tested. The results showed that,in the condition of high temperature(80℃)and high salinity(160000 mg/L),the foaming rate of XHY-4 foam system was greater than 600%,and the half-life period was greater than 600 seconds,and the core flooding experiment indicated that the XHY-4foam system could improved oil recovery by 16.5% with the injection of air-liquid alternation. Field test of nitrogen foam showed that the injection of gas-liquid alternation could form bubbles in the formation,the dominant channel of water flooding could be effectively plugged,which would reduce producing water and increase oil. The success of injection test has provided strong technical support for foam flooding pilot test of ultra deep heavy oil reservoir in Lu-keqin oil filed.