潜山注气重力驱富集油采出技术研究与试验  

Research and testing of gas injection gravity drainage of enriched oil in buried hill reservoirs

作　　者：闫海俊 谢刚[1] 朱瑞彬 游靖 魏爱军 YAN Haijun;XIE Gang;ZHU Ruibin;YOU Jing;WEI Aijun(Engineering Technology Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,Heibei,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]中国石油华北油田公司工程技术研究院,河北省任丘市062552 [2]天津大学化工学院

出　　处：《石油钻采工艺》2022年第6期727-732,共6页Oil Drilling & Production Technology

基　　金：中国石油天然气股份有限公司重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”(编号:2017E-15)。

摘　　要：华北油田于20世纪90年代在古潜山油藏开展了注氮气重力驱提高采收率试验,在试验区形成了“气顶-富集油带-底水”的格局,先期采用裸眼完井利用旧井采油,只出气不出油,为此,进行了油藏工程、采油工艺一体化研究,提出“隔-控-分”采油工艺设计理念,通过克服重力分异、密度差影响的有效驻留承压堵漏,隔绝气相、水相与井筒直接沟通。借助火山熔岩喷发、岩浆冷凝堆积的自然原理,基于热敏树脂特殊的温敏流变性能,实现了“滞留温控闪凝”承压堵漏,解决了高角度大缝大洞发育储层恶性漏失的问题,提高了固井完井质量,结合人工举升控制生产压差,实现了有限厚度富集油的有效采出,坚定了古潜山发展注气重力驱的信心。The Huabei Oilfield has performed enhanced oil recovery testing based on nitrogen injection gravity drainage in the buried hill oil reservoir since the 1990s.The pattern composed of the gas cap,oil-enriched zone and bottom water was formed.The existing wells were used for production,in which pay zones were drilled-in and left openhole after the upper wellbore was cased.However,these wells presented only gas production,with no oil production,Given this,the investigation integrating oil reservoir engineering and production engineering was performed and the production engineering design idea combining isolation,control,and selective production was proposed.It is considered that the key to preventing gas and water from directly flowing into the wellbore is to overcome the effects of gravitational differentiation and density difference to facilitate effective containment,pressure-bearing,and plugging.Inspired by the natural process of lava eruption,cooling and accumulation,the pressure-bearable channel plugging technology of fluid retention and temperature-controlled fast setting was developed,with the help of the unique thermosensitive rheology of thermosensitive resins to overcome gravitational differentiation.Reservoirs developed high-angle large fractures and caverns suffer from severe leakoff,which impacts the quality of cementing and well completion.Yet,the presented technology overcomes such challenges.Moreover,the presented technology combined with the control of drawdown pressure during artificial lifting realizes effective recovery of enriched oil zones with limited thickness.The application performance of this technology strengthens the confidence in applying gas injection gravity drainage in buried hill reservoirs.

关 键 词：古潜山 注气重力驱 富集油 地质工程一体化 热敏树脂 温控闪凝 固井 完井质量 

分 类 号：TE357[石油与天然气工程—油气田开发工程]