During the Steam-Assisted Gravity Drainage (SAGD) technology-based dual horizontal well drilling process, it is necessary to accurately monitor the well spacing in real time to ensure safe and parallel drilling. In this paper, a self-excited codirectionally magnetically compensated rotating ranging method and device is proposed. In the numerical calculation and simulation, both parallel and nonparallel drilling models are established. Based on the models and the magnetic dipole theory, the relation between the magnetization field and the well spacing is analyzed. Furthermore, the one-to-one correspondence between the peak-to-peak value of the magnetization field and the well spacing is revealed. Well spacing is then determined according to the measured peak-to-peak value. To achieve better results, the influence of magnetic source (the magnetic moment) and casing characteristics (magnetic susceptibility, dynamic magnetization length) on measured peak-to-peak value is analyzed. Finally, field tests are carried out, and the feasibility and effectiveness of the theory and device are proved. This study provides innovation for a new approach of magnetic guidance while drilling and has a great significance in the development, testing, and calibration of well-ranging instruments.

中文翻译：

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自激同向磁补偿旋转测距方法

在基于蒸汽辅助重力排水（SAGD）技术的双水平井钻井过程中，有必要实时准确地监控井距，以确保安全和平行的钻井。本文提出了一种自激同向磁补偿旋转测距方法和装置。在数值计算和仿真中，建立了平行和非平行钻井模型。基于模型和磁偶极子理论，分析了磁化场与阱间距之间的关系。此外，揭示了磁化场的峰-峰值与阱间距之间的一一对应关系。然后根据测得的峰峰值确定孔间距。为了取得更好的结果，分析了磁源（磁矩）和外壳特性（磁化率，动态磁化长度）对测得的峰峰值的影响。最后进行了现场测试，证明了该理论和装置的可行性和有效性。这项研究为钻探时磁导的新方法提供了创新，对测距仪器的开发，测试和校准具有重要意义。