摘要
二氧化碳驱是中原油田探索高温高盐油藏高含水后期提高采收率的重要方式，在该类油藏开展泡沫封窜是控制CO2气窜的一种有效方法。针对试验区气窜严重的现状，开发了耐温、抗盐CY-1型CO2泡沫封窜体系。该体系耐温100℃，耐盐25×10^4mg／L，耐钙镁5×10^3mg／L。对CO2泡沫进行了高温高压性能评价，得到了泡沫起泡能力随压力增加而增强的新认识。CO2泡沫相态变化实验结果表明，超临界CO2泡沫在起泡能力与稳泡能力上均大大高于气态CO2泡沫，最长稳泡时间达到3144．3min。应用该体系对中原油田、腰英台油田16口井进行了现场试验，注气压力平均上升1～3MPa，工艺成功率为100％，取得了较好的封窜效果。
The CO2 flooding in high temperature and salinity reservoirs of Zhongyuan oilfield is a new approach to improve the recovery when the reservoirs are at the late high water-cut period after water flooding.Application of foam sealing channeling in those reservoirs is an effective method.Aiming at the problem of severe gas channeling in test field,a system of CO2 foam system with heat resistance and tolerance to salt is developed.The system temperature-resistant reaches 100 ℃,salt-tolerant reaches 25×104mg/L,Ca2+ and Mg2+ resistance up to 5×103mg/L.A new understanding,the pressure is greater,foaming ability is stronger,is obtained through CO2 foam experiment in high temperature and high pressure.The CO2 foam phase change experiments show that the foaming ability and stability of supercritical CO2 foam are significantly higher than the gas CO2 foam and the maximum stabilizing time reaches 3 144.3 min.The CO2 foam system has been used in 16 wells in Zhongyuan oilfield and Yaoyingtai oilfield.The gas injection pressure rises by an average of 1-3 MPa and the success rate of operation is 100%.All wells get good seal channeling effects.The technology will provide a support for gas channeling control during CO2 flooding in high temperature and salinity reservoirs of Zhongyuan oilfield and also will provide references for similar reservoirs home and abroad.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第4期75-78,116,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化股份公司科研项目"濮城沙一段CO2泡沫封窜技术研究"(P11028)
关键词
二氧化碳驱
二氧化碳泡沫
气窜
封窜
泡沫驱
CO2 flooding
CO2 foam
gas channeling
plugging channeling
foam flooding
