阳离子表面活性剂预处理地层延长防垢剂挤注返排寿命  

Formation Pretreatment Using Cationic Surfactant to Enhance the Squeeze Life of Scale Inhibitor

作　　者：宋浩俊 张亮[1,2] 梁玉珠 李杨[1] 任韶然[1,2] SONG Haojun;ZHANG Liang;LIANG Yuzhu;LI Yang;REN Shaoran(College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,P R of China;Key Laboratory of Unconventional Oil&Gas Development(Ministry of Education),China University of Petroleum(East China),Qingdao,Shandong 266580,P R of China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580

出　　处：《油田化学》2022年第4期711-716,共6页Oilfield Chemistry

基　　金：中国海洋石油集团有限公司重大科技项目“南海西部油田上产2000万方关键技术研究”课题1“南海西部在生产油气田提高采收率技术研究”(项目编号CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ)。

摘　　要：海上油田注海水开发,注入水与地层水的不配伍常导致油井硫酸盐结垢现象严重。为有效延长防垢剂挤注寿命,在前置液中添加吸附增强剂,以提高防垢剂在地层中的吸附量和降低防垢剂解吸速度。选择季铵盐表面活性剂十二烷基三甲基氯化铵(DTAC)和阳离子Gemini表面活性剂酰胺基双子季铵盐(GS-A6)为吸附增强剂、聚丙烯酸钠(PAAS)为防垢剂,开展了吸附增强剂与防垢剂的配伍性实验、静态吸附实验和动态吸附-解吸实验。结果表明,在120℃下,两种吸附增强剂与防垢剂的配伍性良好,可提高防垢剂在地层中的吸附量至3倍以上。当含油饱和度从0增至80%时,DTAC预处理岩心后,PAAS的返排寿命从1500 PV降至约1300 PV;而GS-A6在不同浓度、不同含油饱和度情况下,返排寿命均超过1500 PV,适用于不同开发阶段的油井防垢。与DTAC相比,GS-A6具有临界胶束浓度低、表面活性高的优点,延长防垢剂挤注寿命和驱油效果更好。The incompatibility between injected water and formation water often leads to serious sulfate scaling in offshore oilfield.In order to effectively prolong the squeeze life of scale inhibitor,the adsorption enhancer was added in the pre-liquid to improve the adsorption amount of scale inhibitor in the formation and reduce the desorption rate of scale inhibitor. The quaternary ammonium salt surfactant dodecyl trimethyl ammonium chloride(DTAC)and cationic Gemini surfactant amide Gemini quaternary ammonium salt(GS-A6)were selected as the adsorption enhancers,and sodium polyacrylate(PAAS)as the scale inhibitor. The compatibility between adsorption enhancer and scale inhibitor,the static adsorption experiment and dynamic adsorption-desorption experiment were carried out. The results showed that at 120 ℃,the compatibility between the two adsorption enhancers and scale inhibitor was good,and the adsorption capacity of scale inhibitor in the formation could be increased to more than 3 times. When the oil saturation increased from 0 to 80%,the squeeze life of PAAS decreased from 1500 PV to about 1300 PV after DTAC pretreatment.Under different concentrations and oil saturations,GS-A6 had a squeeze life of more than 1500 PV,which was suitable for the scale prevention of oil wells in different development stages. Compared with DTAC,GS-A6 had the advantages of low critical micelle concentration and high surface activity,which prolonged the squeeze life of scale inhibitor and improved the oil displacement effect.

关 键 词：吸附增强剂 防垢剂 阳离子表面活性剂 挤注寿命 

分 类 号：TE358.5[石油与天然气工程—油气田开发工程]