低渗透油藏注水井水力多级脉冲酸化工艺及应用——以姬塬油田为例  

Research and application of the multi-pulse stamping acidification technology ininjection wells of low-permeability reservoirs:Taking Jiyuan Oilfield as an example

作　　者：张顶学[1,2] 孙意 高伟 许译文 古仁超 ZHANG Dingxue;SUN Yi;GAO Wei;XU Yiwen;GU Renchao(School of Petroleum Engineering,Yangtze University,Wuhan 431100,Hubei;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Hubei Province(Yangtze University),Wuhan 430100,Hubei;No.1 Gas Production Plant,Changqing Oilfield Company,PetroChina,Yulin 719000,Shaanxi;Research Institute of Engineering Technology,Xinjiang Oilfield Branch,PetroChina,Karamay 834000,Xinjiang;No.3 Oil Production Plant,Changqing Oilfield Company,PetroChina,Yinchuan 750000,Ningxia)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室(长江大学),湖北武汉430100 [3]中国石油长庆油田分公司第一采气厂,陕西榆林750001 [4]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [5]中国石油长庆油田分公司第三采油厂,宁夏银川750000

出　　处：《长江大学学报（自然科学版）》2022年第5期51-56,共6页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“致密油水平井SRV与基质耦合变质量流动模型研究”(51504038);国家科技重大专项“采出井全生命周期举升工艺及配套技术研究”(2016ZX05056004-002)。

摘　　要：针对姬塬油田注水井注水压力高,欠注严重,常规酸化效果差,有效期短的问题,提出一种水力多级脉冲酸化工艺:首先优化缓速酸酸液体系,再运用多级脉冲造缝,最后挤入酸液实现水井增注。根据姬塬油田的物性和储层伤害原因,优选出了一种缓速酸酸液体系:8%HCl+3%HF+2%HBF_(4)+3%HEDP+3%乙酸+1.5%聚环氧琥珀酸钠(缓蚀剂)+0.5%OB-2(助排剂)。该酸液体系配伍性好,在常温和60℃时静置12h,无沉淀物和悬浮物出现;在60℃条件下经过8h的溶蚀,最终溶蚀率达到了33.25%,有较好的溶蚀速率,表明该酸液体系有较好的溶蚀性能;该酸液对Ca^(2+)、Fe^(3+)和Mg^(2+)的抑制率超过85%,具有很好的沉淀抑制性;岩心驱替实验表明,该酸液体系能明显改善地层渗透率。缓速酸液体系在姬塬油田X井进行了现场试验,注水压力由22.3MPa下降到18.9MPa,累计增注量已达4804m^(3),降压增注效果明显。In view of the problems such as high pressure of water injection,a serious condition of under injection,poor conventional acidizing effect and short effective period,a multi-pulse stamping acidification technology was proposed in Jiyuan Oilfield.Firstly,the retarded acid solution system was optimized,and then the micro-cracks were produced by multi-pulse stamping.Finally,the acid solution was squeezed into the well to increase the injection rate.According to the physical properties of Jiyuan Oilfield and the damage factors of reservoir,a retarded acid solution system was preferred,8%HCl+3%HF+2%HBF_(4)+3%HEDP+3%acetic acid+1.5%sodium poly epoxysuccinate(corrosion inhibitor)+0.5%OB-2(drainage aid).The acid solution system has good compatibility and no precipitate or suspended matter appears after standing for 12h at room temperature and 60℃.After 8h dissolution at 60℃,the final dissolution rate reaches 33.25%,which shows that the acid solution system has good dissolution performance.The inhibition rate of the acid solution on Ca^(2+),Fe^(3+) and Mg^(2+) is more than 85%,showing good precipitation inhibition.The core displacement experiment shows that the acid solution system can significantly improve the formation permeability.The field test of the retarded acid system has been carried out in Well X of Jiyuan Oilfield.The results show that the waterinjection pressure decreases from 22.3MPa to 18.9MPa,and the accumulative injection volume reaches 4804m^(3).It has achieved a good effect of reducing pressure and increasing injection.

关 键 词：低渗透油藏 注水井 多级脉冲酸化 溶蚀率 缓速酸 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]