摘要
以聚合物驱后油藏为研究目标,首次建立了聚合物驱后油藏化学驱进一步大幅度提高采收率的黏度比、界面张力、阻力系数和残余阻力系数等技术政策界限,并形成相应的理论图版;设计了符合技术政策界限的堵驱结合、固相和液相并存的"黏弹性颗粒驱油剂+表面活性剂+聚合物"新型化学驱油体系,即非均相复合驱油体系;优化了胜利油田第一个聚合物驱后油藏非均相复合驱的先导试验方案,矿场实施后先导试验目前已取得显著的降水增油效果,综合含水率由96.6%下降到77.0%,日产油量由17.6 t上升到84.5 t,是化学驱前的4.8倍,实际已提高采收率3.2%,预测最终提高采收率8.5%,最终采收率达63.6%。开辟了聚合物驱后油藏进一步大幅度提高采收率的新途径。
Regarded the oil reservoirs after polymer flooded as the study targets, the technical limits such as the viscosity ratio, interfacial tension, resistance factor, residual resistance factor and so on are first established for the further improvement of the recovery of this kind of reservoirs, and moreover the corresponding theoretical chart boards are drawn; New chemical oil flooding system which meets the above limits called heterogeneous-phase com- bination flooding （HCF） system is designed, including ＂viscoelastic particle displacing agent＋surfactant＋polymer＂ characterized by the combination between the plugging and flooding and furthermore co-existence of the solid and liquid phases. The first HCF pilot test program of the reservoirs after polymer flooded is optimized in the oilfield. After the stimulation of the field test, much obvious results of water reduction and oil increase have obtained： the comprehensive water cut drops from 96.6% to 77.0% ; and the daily oil production increases from 17.6 t to 84. 5 t-4. 8 times of that before the chemical flooding. The actual oil recovery has enhanced by 3.2%, the pre- dicted ultimate EOR will be improved by 8.5% and the final recovery will reach 63.6%. In a word, a new way to further improve the recovery of the reservoirs after the polymer flooded is developed.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2014年第1期122-126,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项重点项目"胜利油田特高含水期提高采收率技术"(2011ZX05011)
关键词
聚驱后油藏
黏度比
界面张力
阻力系数
黏弹性颗粒
提高采收率
oil reservoir after polymer flooded
viscosity ratio
interfacial tension
resistance factor
viscoelasticparticle
EOR
