摘要
伊拉克F油田为孔隙-裂缝型碳酸盐岩油藏,酸化是该油田主要的增产手段。形成有效的主酸蚀蚓孔并提高油气渗流能力是该油田碳酸盐岩酸化成功实施的关键。当注酸排量较低时,酸表面溶蚀,不能实现深穿透;而注酸排量过高时,主溶蚀孔将产生较多的分枝,酸液消耗大,经济性较差。为了优化设计伊拉克F油田碳酸盐岩酸化工艺,文中定义了一种最优排量和液量设计方法,采用岩心酸化流动实验仪和岩心微米CT扫描仪测定了不同注入速度下酸液的突破体积。确定了酸液的最优注入速度和注入体积,等效计算了酸化最优排量和液量。实验结果显示:酸液注入最优的速度约为1mL/min,对应的注入体积约为1PV。等效计算酸化最优排量为0.5~0.7m3/min,对应最优液量为74~80m3。与现场实际数据进行对比,吻合度较高,可为该油田酸化工艺参数的优化设计提供数据支持和理论指导。
Iraq F oilfield is a pore-fracture carbonate reservoir,and acidification is the main measure to increase production in this oilfield.The formation of effective main acid-eroded wormholes and the improvement of oil and gas seepage capacity are the key to the successful implementation of carbonate acidizing in this oilfield.When the acid injection rate is low,the acid can only dissolve the surface and deep penetration cannot be achieved.When the acid injection rate is too high,the main wormhole will produce more branches,resulting in high acid consumption and poor economic efficiency.In order to optimize the design of carbonate acidizing process in Iraq F oilfield,a method which can determine the optimal displacement and liquid volume was defined.The breakthrough volume of acid at different injection rates was measured by core acidizing flow tester and core micro-CT scanner.By determining the optimal injection rate and injection volume of acid,the optimal displacement and liquid volume of acidification are calculated equivalently.The experimental results show that the optimal injection rate for acid system is 1 mL/min,and the corresponding injection volume is about 1 PV.The optimal displacement of acidification by equivalent calculation is 0.5~0.7 m3/min,corresponding to an optimal liquid volume of 74~80 m3.Compared with the actual data on site,the consistency is high,which can provide data support and theoretical guidance for the optimization design of acidizing process parameters in this oilfield.
作者
侯云山
崔波
邵尚奇
陈军
冯浦涌
高纪超
HOU Yunshan;CUI Bo;SHAO Shangqi;CHEN Jun;FENG Puyong;GAO Jichao(China Oilfield Services Limited,Tianjin,300450,China)
出处
《海洋石油》
2025年第1期48-52,57,共6页
Offshore Oil
关键词
碳酸盐岩
酸化工艺
优化设计
最优排量
最优液量
酸蚀蚓孔
carbonate rock
acidizing process
design optimization
optimal displacement
optimal liquid volume
acid-eroded wormholes
