陇东致密油区域恶性出水漏层堵漏技术  

Loss Circulation Control Technology for Malignant Water Leakage Layer in Longdong Tight Oil Region

作　　者：朱明明 孙欢 孙艳 丛成 侍德益 贾继国 ZHU Mingming;SUN Huan;SUN Yan;CONG Cheng;SHI Deyi;JIA Jiguo(Changqing Drilling Company,CNPC Chuanqing Drilling Engineering Company Limited,Xi’an,Shaanxi,710018,China)

机构地区：[1]中国石油集团川庆钻探工程有限公司长庆钻井总公司,陕西西安710018

出　　处：《石油钻探技术》2023年第6期50-56,共7页Petroleum Drilling Techniques

基　　金：中国石油集团重大工程技术现场试验项目“恶性井漏防治技术与高性能水基钻井液现场试验”(编号:2020F-45)资助。

摘　　要：长庆油田陇东致密油区洛河组存在天然裂缝,采用聚合物钻井液钻进易发生失返性漏失,由于其与地层水连通,采用常规堵漏方法堵漏则堵漏材料易被外界流体稀释、冲刷,不易在漏层滞留,堵漏后易复漏。为解决该问题,通过优选预聚体组分和优化催化剂和稀释剂加量,研发了一种遇水反应型堵漏工作液。为了防止其送入过程中遇水反应固化,研制了包含“封隔器+药剂存储腔”的配套送入工具,堵漏工作液与配套送入工具配合,形成了适用于陇东致密油区恶性出水漏层的堵漏技术。遇水反应型堵漏工作液遇到水后具有易分散、自乳化、反应速率可调和固结后强度高等特性,固结砂体抗压强度≥5.6 MPa。配套的送入工具通过逐级升压,将遇水反应型堵漏工作液安全泵至漏失层中。陇东致密油区4口井应用恶性出水漏层堵漏技术进行堵漏,一次高效封固洛河组失返性漏失。现场应用表明,恶性出水漏层堵漏技术可以解决与地层水连通的裂缝性地层漏失问题,为陇东致密油勘探开发提供技术支持。Natural fractures are encountered in the Luohe Formation within the Longdong tight oil area of Changqing Oilfield.Drilling with polymer drilling fluid is liable to lost circulation.As the formation is communicated with aquifer,with conventional plugging methods,the plugging material is dilution-prone and is washed by external fluid making it hard to stay in the thief zone,resulting in frequent lost circulations.To cope with this problem,a waterreactive plugging fluid was developed,by optimizing the prepolymer components and the addition of catalyst and diluent.In order to prevent it from being solidified through water reaction during injection,supporting injection tools with“packer+chemical storage chamber”were developed.Combining the plugging fluid and supporting injection tools,a loss circulation control technology for malignant water leakage layer in Longdong tight oil region was formed.The water-reactive plugging fluid had the characteristics of easy dispersion,self-emulsification,adjustable reaction rate,and high strength after consolidation,and the compressive strength of the consolidated sand body was greater than 5.6 MPa.The supporting injection tools safely pumped the water-reactive type plugging liquid to the leakage layer through a stepwise pressure increase.Loss circulation control technology for malignant water leakage layer was applied in thief zones in four wells in the Longdong tight oil area,which efficiently solved the lost circulation problem in Luohe Formation in one go.The field application show that the technology can solve the problem of leakage in the fractured formation when there is communication with the aquifer and provide technical support for the exploration and development of Longdong tight oil.

关 键 词：致密油 漏失 聚氨基酸酯 堵漏工作液 堵漏工具 陇东地区 

分 类 号：TE28[石油与天然气工程—油气井工程]