M油田注水井堵塞原因分析及解堵增注措施研究  

Cause Analysis of Water Injection Well Plugging in M Oilfield and Study on Measures for Plug Removal and Injection Increase

作　　者：刘建升 刘江波 刘秀华[1] 彭俊发 LIU Jiansheng;LIU Jiangbo;LIU Xiuhua;PENG Junfa(No.3 Oil Production Plant of Changqing Oilfield Branch,Yinchuan,Ningxia 75000,China;Oil&Gas Technology Research Institute of Changqing Oilfield Branch,Xi’an,Shaanxi 710021,China;National Engineering Laboratory of Low Permeability Oil&Gas Fields Exploration and Development,Xi’an,Shaanxi 710021,China;No.3 Gas Production Plant of Changqing Oilfield Branch,Yinchuan,Ningxia 75000,China)

机构地区：[1]中石油长庆油田分公司第三采油厂,750003 [2]中石油长庆油田分公司油气工艺研究院 [3]低渗透油气田勘探开发国家工程实验室 [4]中石油长庆油田分公司第三采气厂

出　　处：《钻采工艺》2021年第1期129-132,共4页Drilling & Production Technology

摘　　要：M油田经过较长时间的注水开发后,部分注水井出现了注水压力升高的现象,且经过常规酸化解堵措施后,有效期较短,因此,需要研究更加高效合理的解堵增注措施以满足该油田注水开发的需要。通过对M油田注水井堵塞原因分析,结果表明,该油田注入水和地层水中均含有较多的成垢离子,在储层温度和压力条件下容易结无机垢对储层造成堵塞,另外,注入水中悬浮物含量和含油量较高,容易对注水井造成固相颗粒堵塞和原油乳化堵塞。岩心驱替实验结果表明,注入水和地层水混合结垢对储层天然岩心的渗透率损害率可以达到45%以上,注入水中固相颗粒对岩心的渗透率损害率达到35%以上,而注入水中原油乳化对岩心的渗透率损害率达到30%以上。解堵增注措施研究结果表明,高效复合解堵增注液能够有效解除M油田储层段天然岩心的堵塞损害现象,达到良好的降压增注效果。After a long time of water injection development in M oilfield,some water injection wells have the phenomenon of water injection pressure rising,and after conventional acidizing and plug removal measures,the effective period is quite short.Therefore,it is necessary to study more efficient and reasonable plug removal and injection increase measures to meet the needs of water injection development in this oilfield.The results show that the injected water and formation water of M oilfield both contain more scale forming ions,which are easy to form inorganic scale under the condition of reservoir temperature and pressure,and block the reservoir.In addition,the suspended matter content and oil content in the injected water are high,which is easy to cause the solid particle plugging and crude oil emulsion plugging.Core displacement experiment results show that the damage rate of the natural core permeability caused by the mixed scaling of injection water and formation water can reach more than 45%,the damage rate of the core permeability caused by the solid particles in the injection water can reach more than 35%,and the damage rate of the core permeability caused by the emulsification of crude oil in the injection water can reach more than 30%.The research results show that the high-efficiency compound solution can effectively remove the plugging damage of the natural core in the reservoir section of M oilfield,and achieve a good effect of reducing pressure and increasing injection.

关 键 词：注水井 结垢 固相颗粒 原油乳化 解堵措施 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]