SAGD horizontal wells are used to enhance oil recovery from heavy oil reservoirs. This technology requires precise separation between the production well and the injection well to ensure the well trajectory, an algorithm is proposed for eliminating ferromagnetic interference while drilling injection are ultra-weak, frequency-instable, and narrow-band. The directional drilling magnetic guidance system (DD-MGS) has been developed by integrating these advanced techniques. It contains a subsystem for the ranging calculation software, a magnetic source, a downhole probe tube and a subsystem for collecting directional drilling trajectory not only in the horizontal section but also in the build section of horizontal injection wells. This new technology has broad potential applications.

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