摘要
针对延长油田靖边乔家洼油区由于储层微裂缝发育而出现的受益井区生产井发生CO_2气窜的问题,采用非均质人造岩心开展水气交替驱、小分子胺封堵后的CO_2驱和改性淀粉封堵后的CO_2驱实验,同时采用径向流模型开展了验证实验,以评价3类方法抑制CO_2气窜的适应范围及在目标储层中的适应性。实验结果表明:水气交替驱、小分子胺封堵后的CO_2驱及改性淀粉封堵后的CO_2驱3类方法抑制CO_2气窜和提高CO_2驱油效率在储层中的渗透率级差适用范围分别为小于30、30~150、150~500;3类方法在目标地层的适应性较好。
In order to solve the problem that gas channeling appeared in the CO2 flooding of the fractured ultra-low permeability reservoir in Qiaojiawa area,Jingbian,Yanchang oilfield,three kinds of oil displacement experiments were carried out using artificial heterogeneous cores,that is,water-CO2 alternating flooding,CO2 flooding after plugging using small molecule amine,and CO2 flooding after plugging using modified starch. At the same time,verification experiments were carried out through radial flow model to determine the adaptive ranges of three kinds of oil displacement methods to the permeability grade difference of the heterogeneous cores and to evaluate the adaptability of three oil displacement methods to inhibiting CO2 channeling of the target reservoir and enhancing its oil recovery. The result shows that,the adaptive ranges of three kinds of oil displacement methods to the reservoir permeability grade difference are 30,30 ~ 150 and 150 ~ 500 successively,and three oil displacement methods have all good adaptability to inhibiting CO2 channeling of the target reservoir and enhancing its oil recovery.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2017年第2期105-109,115,共6页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家科技支撑计划课题"CO2埋存与提高采收率技术"(编号:2012BAC26B03)
陕西统筹科技创新工程计划"陕北致密砂岩油藏CO2驱提高采收率关键技术研究及先导试验"(编号:2014KTZB03-02)
关键词
CO2驱
气窜控制方法
裂缝性特低渗透油藏
储层渗透率级差
CO2 flooding
gas channeling inhibition method
fractured ultra-low permeability reservoir
reservoir permeability grade difference
