“…The devices currently in use to detect the distance between a drilling well and target well are the Single Wire Guidance (SWG) system (Guan et al, 2010;Oskarsen et al, 2009;Kuckes, 1996a), and the Rotating Magnet Ranging Service (RMRS) system (Oskarsen et al, 2009;Wang and Gao, 2008;Kuckes, 1996b). RMRS is an assistant system applied in Steam Assisted Gravity Drainage (SAGD) that guides the drilling of an injection well to ensure it is parallel to the production well (Oskarsen et al, 2009;Wang and Gao, 2008;Kuckes, 1996b;Liu and Wang, 2011;Gao et al, 2013;Al-Bahlani and Babadagli, 2009;Tu et al, 2010).…”