速溶型智能转向酸的开发与应用

Development and Application of Instant and Intelligent Diverting Acid

高 峰 胡 军 程 芳 程晓亮 赵众从

GAO Feng HU Jun CHENG Fang CHENG Xiaoliang ZHAO Zhongcong

为解决长庆油田酸化液添加剂种类多、无法“在线即时”混配的难题，以油酸与N，N-二甲基-1，3-丙二胺等为原料制得两种两性表面活性剂（CQYS-1、CQYS-2），并与多烷基吡啶季铵盐缓蚀剂复配形成酸液稠化剂。以该复合型稠化剂作为酸液的唯一添加剂，按2.2%～2.6%的加量加入15% HCl中配制成转向酸。对稠化剂配方进行了优选，研究了转向酸的各项性能，并在长庆油田苏里格气田进行了现场应用。结果表明，稠化剂中CQYS-1、CQYS-2、缓蚀剂的最佳质量比为67.2∶12.8∶20。稠化剂遇水快速分散（溶解）、遇酸立即起黏，在2～30℃下的起黏速率大于95%。转向酸的耐温耐剪切性较好。在盐酸加量为15%时，转向酸黏度约为60 mPa·s。随着酸岩反应的进行，盐酸质量分数降至8%～10%时的黏度可达110 mPa·s，当盐酸质量分数小于6%时转向酸黏度降至5 mPa·s以下，实现了转向酸的智能转向和智能破胶，转向酸驱替后岩心渗透率明显增大。在长庆油田苏里格气田成功施工15井次，配液实现了“即时在线”的连续混配模式，转向作用明显，效果良好。

In Changqing oilfield，there is a wide variety of additives for acidizing liquids，which makes it impossible to apply immediately on-site after mixing. To improve this problem，two kinds of amphoteric surfactants，CQYS-1 and CQYS-2，were prepared from oleic acid and N，N-dimethyl-1，3-propanediamine，and compounded with multi-alkyl pyridine quaternary-ammonium-salts to form thickening agent. As the sole additive of the acid，this compound thickening agent was added to 15% HCl solution in proportion of 2.2%—2.6% to prepare diverting acid. The formula of thickening agent was optimized，the properties of diverting acid were studied，and the application was carried out in Sulige gas field of Changqing oilfield. The results showed that the optimum mass ratio of CQYS-1，CQYS-2 and corrosion inhibitor was 67.2∶12.8∶20. The thickening agent quickly dispersed or dissolved when exposed to water，and immediately became sticky when exposed to acid. The thickening rate was over 95% of the acid system when the temperature ranged from 0 to 30℃. The diverting acid had good resistance to high temperature and shearing. When the dosage of HCl was 15%，fresh acid viscosity was around 60 mPa·s. It rose to 110 mPa·s when the dosage of HCl decreased to 8% —10% . Finally，the acid viscosity decreased to below 5 mPa·s when the dosage of HCl was less than 6% . Intelligent steering and intelligent breaking were realized during the reaction between acid and rock. In the core flooding experiment，the permeability of core increased remarkably after diverting acid flooding. This diverting acid was successfully applied to a total of 15 wells in Sulige gas field of Changqing oilfield. The on-site application immediately after mixing was realized，indicating obvious diverting effect.

10.19346/j.cnki.1000-4092.2021.01.008