[1]Oppelt J,Chur C,Feld D,et al.New concepts for vertical drilling of boreholes[R].SPE 21905,1991.
[2]Chur C,Oppelt J.Vertical drilling technology:A milestone in directional drilling[R].SPE 25759,1993.
[3]Ligrone A,Oppelt J,Calderoni A,et al.The fastest way to the bottom:Straighthole drilling device-drilling concept,design considerations and field experience[R].SPE 36826,1996.
[4]Matthias R,Marcus O,Hermilo M,et al.Straight down to success:Performance review of a vertical drilling system[R].SPE 84451,2003.
Gao Deli.Discussions on theories and techniques about rapid drilling while preventing deviating in formations tending to deflecting[J].Petroleum Drilling Techniques,2005,33(5):16-19.
Su Yinao,Li Songlin,Ge Yunhua,et al.The design and control ways of the downhole automatic closed loop of vertical drilling tool[J].Acta Petrolei Sinica,2001,22(4):87-91.
Wang Haige,Su Yinao.Progress of theoretical research on deviation control and drilling fast for vertical wells[J].Acta Petrolei Sinica,2004,25(3):86-90.