Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1991-08-26
1992-02-25
Neuder, William P.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 75, 285178, E21B 708
Patent
active
050904965
ABSTRACT:
A bent motor housing has a top end by which it is connected to the end of a drill string within a borehole and a bottom end on which a drill bit is mounted for drilling the borehole. A bend is provided intermediate the top and bottom ends for angularly offsetting the rotational axis of the drill bit relative to the longitudinal axis of the drill string to cause the drill bit to engage the wall of the borehole on one side. Furthermore a longitudinal bore provided for passage of a motor shaft extends from the top end to the bottom end of the housing and is concentrically disposed with respect to the top end and the bottom end but eccentrically disposed with respect to intermediate housing sections so as to form a stand-off portion in the vicinity of the bend for bearing against the wall of the borehole on the opposite side to that engaged by the drill bit so as to cause the angle of tilt .THETA. of the rotational axis of the drill bit relative to the axis of the borehole to exceed the angle of the bend in the housing.
REFERENCES:
patent: 4653598 (1987-03-01), Schuh et al.
patent: 4771832 (1988-09-01), Bridges
patent: 4772246 (1988-09-01), Wenzel
patent: 4813497 (1989-03-01), Wenzel
patent: 4817740 (1989-04-01), Beimgraben
patent: 4834719 (1989-05-01), Arenas
patent: 4962818 (1990-10-01), Delucia
R. Feenstra et al., "A Technique for Continously Controlled Directional Drilling", 1984 Drilling Technology COnference, 11-27.
Baroid Technology Inc.
Neuder William P.
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