E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/12
E21B 4/02 (2006.01) E21B 7/06 (2006.01) E21B 7/08 (2006.01)
Patent
CA 1212098
A B S T R A C T DOWN-HOLE MOTOR AND METHOD FOR DIRECTIONAL DRILLING OF BOREHOLES A down-hole motor is provided with stabilizer means 10A for centralizing the longitudinal motor axis I in a borehole and with a bearing unit 11 which supports the output shaft 5 in such an inclined position relative to the motor housing 1, that the central axis II of the output shaft 5 intersects the longitudinal axis I at a point of intersection 20 located outside the housing 1. Directional drilling of a borehole is carried out by actuating a drill bit 12 to rotate relative to the motor housing 1 about the central axis II of the output shaft 5 and simultane- ously therewith rotating the motor housing 1 about the longitudinal motor axis I over periods that are preceded and succeeded by selected periods over which the motor housing 1 is not rotated. Fig. 1
439550
Shell Canada Limited
Smart & Biggar
LandOfFree
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