摘要
针对孤岛油田稠油热采中的汽窜井和高含水井蒸汽吞吐效果差的问题,进行了氮气泡沫调剖技术应用试验。利用气流法测试了发泡剂的性能,试验结果表明,在260℃的条件下,0.3%的发泡剂恒温24h后,泡沫半衰期保留率为94.1%;通过岩心试验测定发泡剂在260℃耐温72h后的封堵能力时,优选浓度为0.3%的发泡剂体系,发泡剂最佳气液比为2∶1。双管驱油试验结果表明,注蒸汽时注入氮气泡沫体系的采收率比蒸汽驱的采收率提高了23.9%;在标准条件下,经济有效的氮气、蒸汽和发泡剂注入比例为60∶1∶1。至2005年已现场应用13井次,成功率为100%,实施后与上一周期对比单井平均增产原油946t,表明氮气泡沫调剖技术是改善稠油蒸汽吞吐后期开采效果的有效工艺。
Because of poor effect of steam stimulation in gassed - out wells and high - water - cut wells during thermal recovery of heavy oil in Gudao Oilfield,application experiment of nitrogen - foam profile control technology is carried out. The behavior of foamer is tested using air flow method. The results are retention rate of half life period of the foam is 94.1% after 0.3% foamer stays at 260℃ for 24h. When the plugging capacity of the foamer is tested in core experiment for 72h at constant 260℃, the best concentration is 0.3% and the best gas-liquid rate is 2: 1 in the foamer system. Double tube oil displacement experiment results indicate that the recovery efficiency of the nitrogen - foam system injection when steam injetion increases 23. 9% than that in steam flood. Under the standard conditions, the injected proportion of nitrogen, steam and foamer is 60: 1 : 1. To 2005,13 well-times has been applied in the field with 100% of success rate. Average oil incremental production of the single well is 946t after application than that in former cycle. It presents that the nitrogen-foam profile control technology is an effective way of improving production effect of heavy oil steam stimulation in later period.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2006年第5期75-77,共3页
Petroleum Geology and Recovery Efficiency
