摘要
为探讨进一步提高高温、高盐水驱废弃油藏采收率潜力,以河南濮城沙一下亚段油藏为目标,开展了注入CO2流体性质变化、细管驱替、长岩心驱替室内试验。试验验证了注入CO2可改善原油流动性、有效增加地层能量和可动油等驱油机理;油藏原油性质好,混相压力低,目前油藏条件可达到混相;优选CO2/水交替驱为最佳注入方式;优化了注入段塞组合;组分检测分析认为CO2/水交替驱波及到了水波及不到的原油。研究结果为濮城沙一下亚段油藏CO2驱矿场试验提供了技术支持,并对其他特高含水期油藏注CO2进一步提高采收率同样具有借鉴意义。
In order to further improve the potential water-flooded and abandoned reservoirs with high temperature and high salt to enhanced oil recovery,by taking the Es1 reservoir in Pucheng Oilfield as a goal for laboratory experiments on fluid property,the slime-tube driving and long core displacement by using CO2 injection.It was verified experimentally that the flooding mechanism of injected CO2 could improve oil fluidity,increase the formation energy and mobile oil;the reservoir had good oil properties and low miscibility pressure,the current reservoir conditions were miscible;CO2/water flooding was the best way for flooding;and slug combination was optimized.Composition analysis indicated that CO2/water flooding swept the residual oil after water flooding.The result provides technical support for the field test of Es1 reservoirs in Pucheng Oilfield and provides reference for enhancing oil recovery of CO2 injection in other similar reservoirs.
出处
《石油天然气学报》
CAS
CSCD
2012年第4期131-135,169,共5页
Journal of Oil and Gas Technology
