水驱老井转CCUS注入井风险评价方法  

Risk evaluation method for converting previous water injection wells to CCUS injection wells

作　　者：刘向斌[1,2] 黄伟明 马文海[1,2] 王清铎 徐广云[1,2] 张晓川 安志波 LIU Xiangbin;HUANG Weiming;MA Wenhai;WANG Qingduo;XU Guangyun;ZHANG Xiaochuan;AN Zhibo(Oil Production Engineering Research Institute,PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163453,Heilongjiang,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation,Daqing 163453,Heilongjiang,China)

机构地区：[1]中国石油大庆油田有限责任公司采油工程研究院 [2]黑龙江省油气藏增产增注重点实验室

出　　处：《石油钻采工艺》2022年第6期752-757,共6页Oil Drilling & Production Technology

基　　金：黑龙江省博士后资助项目“碳中和、碳达峰--二氧化碳驱油埋存关键采油技术研究”(编号:LBH-Z21126);中国石油重大科技专项“二氧化碳规模化捕集、驱油与埋存全产业链关键技术研究及示范”(编号:2021ZZ01)。

摘　　要：针对大庆敖南油田碳捕获、利用与封存(CCUS)试验区水驱老井转CO_(2)注入井井筒密封性失效风险高的问题,开展了井筒完整性评价研究。通过试验区老井井况分析,确定了井筒完整性评价技术体系,采用层次分析法确定指标权重。针对以往完整性评价过程对于单一指标评价依靠专家经验法的不足,创新采用数值模拟分析方法,给出了套管及水泥环等单因素风险评价指标确定原则,采用模糊综合评价方法建立了水驱老井转CO_(2)注入井风险量化分级方法。结果表明:试验区361口注水井中等风险以上井占比41%,需要立即治理或报废处理;对低风险井进一步查套分析,加强监控。建议在国内各大CCUS试验区推广应用注入井风险评价方法及管理理念,为水驱老井的安全运行提供保障。The evaluation and analysis of well integrity were performed,considering the high risks of well sealing failure during the conversion of previous water injection wells to CO_(2) injection wells in the carbon capture,utilization and storage(CCUS)testing area of the Aonan oilfield,Daqing.Based on the analysis of conditions of existing water injection wells,the technical system of the well integrity evaluation was built,and the weights of indexes were determined via the analytical hierarchy process.Given that in the previous well integrity evaluation,the assessment of each index is solely based on the expert survey,an innovative numerical simulation approach was developed,and the determination principles for the single-factor risk evaluation index,such as casing and cement sheath,were clarified.Furthermore,the quantitative risk ranking method was proposed for the conversion of water injection wells to CO_(2) injection wells.This research showed that among 361 injection wells of the testing area,wells with medium risks and above account for 41%,requiring immediate treatment or abandonment;for wells with low risks,the casing should be inspected and monitoring should be strengthened.It is suggested that the risk evaluation method and management strategy should be promoted across major CCUS testing areas in China to ensure safe operations of existing water injection wells.

关 键 词：CCUS CO_(2)注入井 井筒完整性 模糊综合评价 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]