电磁探测定位系统及其在救援井设计中的应用

Application of electromagnetic detection and location system in the design of relief well

由于井眼轨迹不确定性的存在,要实现救援井与事故井的连通必须借助相应的探测定位工具,因此电磁探测定位系统的研究对于救援井方案设计及作业具有重要意义。研究分析了电磁探测定位系统的基本原理,分析了电磁探测定位系统事故井套管汇集电流计算方法及其流动分布特征;研究了救援井与事故井之间相对距离及相对方位的计算方法;结合电磁探测定位系统的实际应用,研究分析了事故井套管参数、切入角、井斜角、地层等参数对电磁探测定位系统测量效果及应用的影响;以电磁探测定位系统研究分析为基础,完成了南海某超深水井救援井设计中测距及连通相关工作。可以为救援井电磁探测定位系统研制提供相应的理论基础,并为救援井电磁探测定位系统在救援井设计、作业中的应用提供参考。

Due to uncertainties of wellbore track, appropriate detection and location tools must be used to connect the relief well and the accident well. Thus, the research of electromagnetic detection and location system is important to the design and operation of relief wells. This paper studies the basic principle of electromagnetic detection and location system (EDLS) and analyzes the calculation method of casing collection current in accident wells using the EDLS and its distribution characteristics; the paper also investigates the calculation methods of relative distance and relative direction between the relief well and the accident well; in combination with the practical applications of the EDLS, the effects of casing parameters, cutting angle, hole drift angle, and formation and other parameters in the accident well on the measurement effects and applications of the EDLS are analyzed; building on the analysis of the EDLS, the distance measurement and connection in the design of a super deepwater relief well in the South China Sea is ifnished. This paper can provide a theoretical basis for the development of EDLS for relief wells and offer a reference for the application of EDLS in the design and operations of relief wells.