摘要
顺北油田断控缝洞型油藏开发难度大,且顺北一区由于地层能量过低,自然递减率大幅度上升,亟需注水补充能量。由于水进路径往往由断裂面控制,水驱过程中存在严重水淹水窜问题,水驱失效分析缺乏理论依据。以顺北油田注水开发生产动态数据为基础,采用K-means聚类分析方法,建立了注水补能分类标准,结合聚类中心分类结果,明确了注水受效的定量界限,当压力增量不小于8.7 MPa,且日产油增量不小于15.2 t时,判定为注水受效井,反之为注水失效井。基于构建的注水补能分类标准,对研究区的12口注水井进行了注水受效评价指标影响性分析,重点分析了焖井时间、周期累计注水量、周期注采比、方水换油率和单位压力恢复耗水量的影响。并以顺北1号断裂带SHB5-4H井为例,分析了注水失效的原因,为顺北1号断裂带断控缝洞型油藏注水方案制定及失效井对策分析提供了理论依据。
In the Shunbei oilfield,the fault-controlled fractured-vuggy reservoirs are difficult to develop,and particularly in the Shunbei Zone 1,the severely depleted formation energy has induced a sharp rise of the natural decline rate of production,necessitating water injec-tion for energy replenishment.The water flow pathways are predominantly constrained by fault surfaces,leading to severe water channeling and flooding during waterflooding process.Currently,there is a lack of theoretical frameworks for analyzing waterflooding failures.Based on the performance data of production by water injection in the Shunbei oilfield,and by using the K-means clustering algorithm,the classifica-tion criteria for energy replenishment via water injection was established.Based on the analysis results of clustering center,the quantitative threshold for injection effectiveness was determined,that is,a well is deemed effective if the pressure increment exceeds 8.7 MPa and the daily oil production increment is not less than 15.2 t;otherwise,it is considered ineffective.Using the established classification criteria,12 water injection wells in the study area were evaluated,focusing on key influencing factors such as soaking time,cumulative injected water volume per cycle,injection-production ratio per cycle,ratio of oil production increment after water injection to cumulative water injection volume,and water consumption per unit of pressure recovery.A case study of Well SHB5-4H in the Shunbei No.1 fault zone elucidates the causes of waterflooding failure,providing a theoretical foundation for designing water injection strategies and optimizing remediation mea-sures for ineffective wells in the fault-controlled fractured-vuggy reservoirs.
作者
刘耀宇
何云峰
张文学
梅胜文
池林贤
王利刚
LIU Yaoyu;HE Yunfeng;ZHANG Wenxue;MEI Shengwen;CHI Linxian;WANG Ligang(No.4 Oil Production Plant,Northwest Oilfield Company,Sinopec,Aksu,Xinjiang 842200,China)
出处
《新疆石油地质》
北大核心
2025年第4期470-477,共8页
Xinjiang Petroleum Geology
基金
中国石化科技攻关项目(P21064)。
关键词
顺北油田
断控缝洞型油藏
注水补能
评价指标
注水失效分析
Shunbei oilfield
fault-controlled fractured-vuggy reservoir
water injection for energy replenishment
evaluation indicator
fail-ure analysis
