碳酸盐岩酸液注入段塞组合方式及其协同效应  

Combination mode and its synergistic effect of acid slug injection into carbonate rock

作　　者：崔波[1] 冯浦涌[1] 荣新明[1] 姚二冬 周福建[2] 张强[1] CUI Bo;FENG Puyong;RONG Xinming;YAO Erdong;ZHOU Fujian;ZHANG Qiang(COSL Production Optimization Department,CNOOC,Tianjin 300450,China;Institute of Unconventional Oil and Gas Science and Technology,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300450 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《大庆石油地质与开发》2023年第1期100-107,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“中亚和中东地区复杂碳酸盐岩油气藏采油采气关键技术研究与应用”(2017ZX05030005);国家科技重大专项“超深裂缝性气藏井筒失稳机理及转向工艺优化研究”(2016ZX05051003)。

摘　　要：伊拉克S油田主力开发层系为中高孔、中低渗的孔隙-裂缝型碳酸盐岩油藏,酸化是该油田增产改造的主要技术手段。碳酸盐岩酸岩反应速度快,为实现深部处理,酸液体系均以缓速酸为主。该油田目前使用了多种缓速酸,为了进一步降本增效,需要探索各种缓速酸最佳的段塞组合方式及其协同效应。因此选用3种缓速酸(乳化酸,交联酸,螯合酸),使用岩心流动仪和CT扫描仪,研究了单一缓速酸及其两两组合时的酸蚀蚓孔形态及变化规律,定义了一种碳酸盐岩酸液段塞组合选择方法,探索了不同酸液之间协同增效作用。实验结果表明:不同缓速酸段塞组合均具有一定的协同增效作用,主控因素为酸液类型,其中乳化酸和交联酸协同增效作用最强,协同效应达49.69%,可节省近一半的酸液用量,降本效果显著。实验结果可为酸液体系的选择及酸化工艺参数的优化提供理论依据。The main development strata series of S Oilfield in Iraq is porous-fractured carbonate rock reservoir with middle-high porosity and low-middle permeability.In order to realize deep penetration,the main acid system of carbonate rocks is retarded acid.In order to reduce cost and increase efficiency,it is necessary to explore the optimal slug combination mode and its synergistic effect of various retarded acid systems.3 kinds of retarded acid system(emulsified acid,cross-linking acid and chelated acid)are selected,core flow meter and CT scanner are used to study wormhole form and change law of single retarded acid system and pairwise combination of retarded acid.A carbonate acid slug combination selection method is defined,and the synergistic effect of different kinds of retarded acid is analyzed.The experiment shows that all of the retarding acid slug combinations have synergistic effect,and retarded acid type is the main control factor.Emulsifying acid and cross-linking acid have the strongest synergistic effect,reaching 49.69%,which can save nearly half of acid volume and reduce cost significantly.The experimental results provide theoretical basis for selection of acid system and optimization of acidizing operation parameters.

关 键 词：碳酸盐岩 段塞注入 协同效应 乳化酸 交联酸 螯合酸 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]