储气库注采排液转换完井技术研究  

The Research of Injection-Production and Drainage Convertion Technology in UGS Completion

作　　者：檀德库[1] 贺梦琦[1] 李渔刚 匡韶华[1] 王玲[1] 程涵彬 TAN Deku;HE Mengqi;LI Yugang;KUANG Shaohua;WANG Ling;CHENG Hanbin(PetroChina Liaohe Oil Field Co.,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油辽河油田公司,辽宁省盘锦市124010

出　　处：《钻采工艺》2025年第2期95-101,共7页Drilling & Production Technology

基　　金：中国石油勘探与生产分公司重大专项“储气库高效建设示范工程”课题“复杂断块群储气库建库关键技术与现场试验”(编号:2022KT2301)。

摘　　要：为了提升储气库的库容,需部署排液增容井,但排液井仅具备采油功能,无法兼顾储气库注采气及安全需求。考虑注采井建井费高达数千万元,为了充分利用现有钻井井眼资源,针对注采气井要求排液增容与注采气生产制度相悖的问题,亟需研发排液增容注采转换一体化工艺,实现单井注气期排液,采气期采气,最终注采气的目的。通过创新设计注采短节、双级封隔器等工具,应用分层注采原理,可满足排液增容注采转换一体化工艺。利用PipeSim与WellCat等专业数值模拟软件,针对不同工况对管柱运用流体力学分析与工程力学优化分析。模拟结果显示设计的注采短节工具防止气体冲蚀能力近似等于原通径尺寸管柱,合理优化坐封程序后,双层封隔器间受力降幅达90%。现场试验表明,一体化工艺管柱入井后,气层、油层可单独开闭,管柱整体安全密封,施工成功率100%,可实现排液、增容目的同时满足储气库注采的要求,确保储气库注采井下管柱的长期安全性、可靠性。In order to improve the storage capacity of UGS,it is necessary to deploy liquid drainage and capacity increase wells.But the liquid drainage wells only have the function of oil production,and can not take into account the gas injection,production and safety requirements of gas wells.Considering that the well construction cost of injection-production wells is up to tens of millions of yuan,in an effort to make full use of the existing well resources,and in view of the problem that the requirement for liquid drainage and capacity increase of injection-production gas wells is contrary to the system,it is urgent to develop the integrated process of liquid drainage and capacity increase and injection-production conversion,so as to realize the purpose of liquid drainage during gas injection period,gas production during gas production period,and finally injection and production as well.Through the innovative design of injection-production nipple,double packer and other tools,and the application of separate layer injection-production principle,the integrated process can be met.Using PipeSim,WellCat and other professional numerical simulation software,hydrodynamics analysis and optimization analysis of engineering mechanics are applied to the pipe string under different working conditions.The results show that,the gas erosion prevention ability of injection-production nipple is approximately equal to the pipe string which has the original diameter.After reasonably optimizing the packer setting procedure,the force between the double packers decreases by 90%.The field test shows that after the integrated process string is running into the well,the gas or oil layer can be opened and closed separately,and the string can be safely sealed as a whole.The operation successful ratio is 100%,which can achieve the purpose of liquid drainage and capacity increase,and meet the requirements of injection and production,so as to ensure the long-term safety and reliability of the string for UGS.

关 键 词：储气库 注采气井 排液 增容 完井管柱 冲蚀 

分 类 号：TE37[石油与天然气工程—油气田开发工程]