潜山油藏智能转向酸化技术研究与应用  

Study and Application of an Intelligent Self-Diverting Acidizing Technology for Buried-Hill Reservoir Development

作　　者：马应娴 田博涵 毛源[3] 程永红 苗鑫 郭建春 MA Yingxian;TIAN Bohan;MAO Yuan;CHENG Yonghong;MIAO Xin;GUO Jianchun(Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500;Hekou Oil Production Plant,Shengli Oilfield Branch,Sinopec Corporation,Dongying,Shandong 257002)

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500 [2]油气藏地质及开发工程国家重点实验室,成都610500 [3]中国石化股份公司胜利油田分公司河口采油厂,山东东营257200

出　　处：《钻井液与完井液》2023年第1期118-124,共7页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金联合基金“四川盆地深层含硫碳酸盐岩气藏立体酸压基础研究”(U21A201985);中石化油田协作项目“沙四段灰岩酸液体系优选及配方优化”(30200007-21-ZC0613-0023)。

摘　　要：胜利油田潜山油藏储层埋藏深、温度高、跨度大、缝洞系统较为发育,针对酸化过程中酸液易漏失、低渗储层区域酸化程度低、施工后层间渗透率差距大的问题,通过引入羟烷基磺酸提高长链脂肪酸酰胺甜菜碱溶解性和耐温性,制得一种速溶耐温的转向剂,将该转向剂和HCl复配得到转向酸。对酸液体系配方进行了优选,研究了转向酸的各项性能。研究发现,该速溶耐温转向酸体系起黏速率快,具有良好的耐温耐剪切性能,适用于160℃的储层。转向酸体系在pH值3~7范围内黏度保持较好,具有良好的转向性能。双岩心酸液流动驱替实验表明,对于渗透率级差在10以下的并联岩心,酸液转向体系具有较好的均匀酸化效果。在胜利油田潜山油藏成功施工37井次,平均单井日增油量为7.3 t/d,日增液量为11.5 m^(3)/d,控水增油效果显著。The buried-hill reservoirs in the Shengli Oilfield have these characteristics:deep buried depths,high temperatures,large spans and highly developed fractures and vugs.In well acidizing operation,the acids are easy to be lost into the fractured formations,the reservoir formations with low permeability are poorly acidized,and after acidizing operation,different pay zones have permeabilities that are greatly different.To solve these problems,an instant high-temperature stable self-diverting agent was developed by introducing hydroxyalkyl sulfonic acid into long-chain fatty acid amide betaine to improve the solubility and temperature resistance of the latter.A self-diverting acid was then developed by mixing the self-diverting agent and HCl.The acid was carefully formulated and its properties were studied.It was found that this instant high-temperature stable self-diverting acid has the ability of fast viscosity development,and is resistant to the negative effects of high temperature and shearing.It can be used to acidize reservoir formations of 160℃.This self-diverting acid has satisfactory viscosity at pH values between 3 and 7,and has good diverting performance.Acid flooding displacement through double cores shows that for parallel cores with permeability difference below 10,these cores can be acidized with good uniformity.This self-diverting acid has been successfully used on 37 wells in the buried-hill reservoir,with average oil production increase of 7.3 t/d per well,and average liquid production increase of 11.5 m^(3)/d per well,showing good performance in oil production enhancement and water production control.

关 键 词：潜山油藏 酸化 自转向 两性离子表面活性剂 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]