高温低渗透油藏注气防窜聚合物泡沫体系的性能评价  

Performance of Anti-gas-channeling Polymer Foam System in High Temperature Low Permeability Reservoir

作　　者：陈浩 杨冉[1,2] 刘希良 谭先红 田虓丰 李博文 CHEN Hao;YANG Ran;LIU Xiliang;TAN Xianhong;TIAN Xiaofeng;LI Bowen(State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,P R of China;College of Safety and Ocean Engineering,China University of Petroleum,Beiijng 102249,P R of China;CNOOC Research Institute,Beiijng 100027,P R of China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)安全与海洋工程学院,北京102249 [3]中海油研究总院,北京100027

出　　处：《油田化学》2022年第2期295-300,共6页Oilfield Chemistry

基　　金：国家自然科学基金青年科学基金“考虑杂质混入、水盾阻隔及孔隙尺寸效应的CO_(2)近混相驱油典型特征研究”(项目编号51704303)。

摘　　要：渤海34-2高温低渗透油藏空气驱过程易发生气窜,常规控制手段存在较多局限性,亟待研究新的调剖技术。基于聚合物增黏和泡沫调驱双重特性,研发了一种聚合物泡沫调剖体系,测试了该体系的泡沫稳定性、流变性能,通过室内驱替实验和CT扫描评价了该体系的封堵性能和作用范围,在此基础上采用二维模型分别进行了注空气后转水气交替(WAG)实验和注调剖剂再注空气实验。结果表明,130℃下聚合物泡沫调剖体系对渗透率约35×10^(-3)μm^(2)的岩心封堵率高达98%,能很好地抑制气窜。在气体突破后WAG方式可提高驱油效率10.14%;而采用注复合泡沫调剖体系再转气驱提高驱油效率15.81%,较常规WAG驱油效率提高5%以上。高温下聚合物泡沫调剖体系的封堵能力和提高采收率效果较好,为同类高温低渗透油藏注气防窜提供了一条新思路。Gas channeling is easy to occur during air injection in Bohai 34-2 high temperature and low permeability reservoir.There are many limitations in conventional control methods,so it is urgent to study new profile control technology.Based on the dual characteristics of polymer viscosity increasing and foam profile control,a new polymer foam profile control system was developed,and the foam stability and shear resistance of the system were tested.The plugging performance and action range of the new profile control system were evaluated through indoor displacement experiment and CT scanning.On this basis,the two-dimensional model was used to carry out the anti channeling experiment of water gas alternation(WAG)after air injection and the anti channeling experiment of profile control agent after air injection.The results showed that the plugging rate of core with permeability of 35×10^(-3)μm^(2) was up to 98%at 130℃and the gas channelling could be well suppressed by the polymer foam profile control system.After gas breakthrough,WAG method could improve oil displacement efficiency by 10.14%.However,the oil displacement efficiency was improved by 15.81%using the injection compound foam profile control system and then gas flooding,which was more than 5%higher than that of conventional WAG.Polymer foam profile control system had good plugging ability and could enhance oil recovery under high temperature,which provided a new idea for gas injection and channeling prevention in similar high temperature and low permeability reservoirs.

关 键 词：高温低渗透油藏 注空气驱 调剖体系 防窜技术 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]