ABSTRACT In the context of connected wells, a rotating array magnetic dipole model is utilised to study the spatial propagation characteristics of the active alternating magnetic field. A low‐frequency alternating magnetic field guiding and positioning algorithm for connected wells is proposed, and a characteristic magnetic field intensity algorithm based on the Hilbert transform is developed. Numerical simulation and field tests of the positioning algorithm are carried out. The results indicate that when the distance between the target end and the source end is 40 m, the positioning error is less than 0.002 m. Furthermore, as the distance between the rotating permanent magnet and the target point decreases, the positioning error and positioning accuracy improve significantly. Field tests further verify the feasibility of the proposed algorithm. This paper presents a highly accurate drilling trajectory guidance ranging method based on the model of rotating magnetic dipole. With this method, the direct guiding of the drill bit to the target point is realised, which improved the efficiency of directional drilling.
Zhang et al. (Thu,) studied this question.