摘要
地层非均质性使得稠油油藏注蒸汽多轮次吞吐开采后期开发效果变差。伴蒸汽注入氮气和泡沫剂可有效提高蒸汽的波及效率和驱替效率,改善稠油热采的开发效果。针对胜利油田稠油油藏特点,研制了一种新型高温复合泡沫剂FCY(该泡沫剂在310℃、气液比1∶1条件下阻力因子达到20以上),并研究了温度、矿化度、剩余油饱和度对其封堵效率的影响。FCY体系提高稠油油藏采收率实验表明:FCY泡沫剂可有效降低油水界面张力,提高注入蒸汽的驱替效率;伴蒸汽注入FCY体系可以提高稠油油藏采收率,降低含水率;氮气和泡沫剂合注为最佳注入方式。胜利油田现场应用证明,高温复合泡沫体系FCY可有效改善热采稠油油藏吞吐开发效果,封堵大孔道,防止汽窜。
In the later stage of the steam flooding recovery of heavy oil reservoirs, the cyclic production and the oil to steam ratio become low because of the heterogeneity of the reservoirs. Nitrogen and foaming agents injected with steam can raise the sweep efficiency and displacement efficiency of the steam, and improve the effect of thermal exploitation. Aimed at Shengli heavy oil reservoirs, a new type foaming agent FCY was developed. The resistance factor of the agent was over 20 in the condition of gas to liquid ratio 1 : 1 and 310℃. The influences of temperature, salinity, residual oil saturation on the resistance factor were studied. The experimental results show that the FCY foaming agent decreases the interfacial tension of oil/water and raises the oil displacement efficiency. The foaming agent injected with steam can enhance the recovery efficiency of heavy oil reservoirs and decrease water cut. The injection of nitrogen and the foaming agent at same time is the best way. The field application of the agent in the Shengli Oilfield demonstrates that the foaming agent can prevent breakthrough of gas and raise the production.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期212-216,共5页
Petroleum Exploration and Development
基金
中国石化科技攻关项目"泡沫驱替提高稠油开发效果研究"(P03024)
关键词
泡沫
稠油
热采
泡沫剂
氮气
foam
heavy oil
thermal recovery
foaming agent
nitrogen