磁导向钻井技术在井眼重入中的应用  

Magnetic steering drilling technology and its application in re-entry of borehole

作　　者：胡一鸣 于晓东 翁广超 Hu Yiming;Yu Xiaodong;Weng Guangchao(Underground Gas Storage Department,PetroChina Jidong Oilfield Company,Tangshan,Hebei 063004,China;No.1 Drilling Engineering Company,BHDC,Tianjin 300280,China;Directional Drilling Company,BHDC,Tianjin 300280,China)

机构地区：[1]中国石油冀东油田储气库建设项目部 [2]中国石油渤海钻探工程公司第一钻井公司 [3]中国石油渤海钻探工程公司定向井技术服务公司

出　　处：《天然气勘探与开发》2022年第3期57-66,共10页Natural Gas Exploration and Development

摘　　要：在储气库库址筛选评价中发现某些生产老井,由于卡钻、钻具落井等历史原因,存在弃置裸眼钻穿储气库盖层的现象,为了建库安全,需要对其裸眼进行有效封堵。但由于井下钻具与周边套管对测量工具存在严重的磁干扰影响,常规方法不能有效封堵裸眼。为此,通过救援井重入裸眼固井封堵的方式,利用国内自主研制的首套主动磁测距系统计算出两井眼的空间距离,搭配陀螺测斜仪校正救援井的方位,反演出两井眼的空间位置关系,引导救援井重入裸眼,完成冲探、封堵作业。结果表明:①救援井重入裸眼方案具有可行性和操作性,可通过无线随钻测量系统接近老井、磁测距定位逼近、轨迹伴行跟踪、连通重入裸眼4个阶段实现对救援井轨迹的精准控制;②通过轨道优化调整、岩屑识别及元素分析、钻具组合优选及钻井参数优化等多项技术手段,现场顺利实现裸眼重入;③国内首套主动磁测距系统可满足井眼重入轨迹的精度要求,磁导向钻井技术在储气库复杂弃置井眼的重入封堵领域得到了成功应用。During the siting and evaluation of underground gas storage(UGS), it is found that UGS caprock was penetrated by abandoned open holes of some old production wells due to sticking and falling of tool. In order to ensure the safety of UGS construction,the open holes must be plugged effectively. However, magnetic interference from downhole drilling tools and casings impact seriously on measuring tools. The open holes cannot be plugged by conventional methods. Therefore, the way of relief well re-entering into open hole is used to realize cementing and plugging. Firstly, the self-developed active magnetic ranging system is adopted to calculate the spatial distance between two holes. Then, combined with the azimuth of relief well calibrated by gyro-inclinometer, the spatial relationship between the two holes is obtained from inversion. On this basis, the relief well is conducted to re-enter into open hole to complete the flushing and plugging operations. Results show that,(1) the method of relief well re-entering into open hole is feasible and operable;accurate control of the relief well trajectory can be achieved through four stages: approaching old well by wireless measurement while drilling system, magnetic ranging positioning, real-time tracking of trajectory, and connecting and re-entering into open hole;(2) the open hole re-entry has been realized on site through trajectory optimization, cuttings identification and element analysis, drilling assembly optimization, and drilling parameter optimization;and(3) the first self-developed active magnetic ranging system can satisfy the required trajectory accuracy of borehole re-entry. The magnetic steering drilling technology has been successfully applied to the re-entry for plugging of complex abandoned boreholes in UGS.

关 键 词：磁测距 弃置井眼 重入 储气库 轨迹控制 

分 类 号：TE24[石油与天然气工程—油气井工程]