E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/68
E21B 10/62 (2006.01)
Patent
CA 1292464
RADIALLY STABILIZED DRILL BIT ABSTRACT OF THE DISCLOSURE A stabilized drill bit has a cylindrical main body, a formation cutting face at the lower end of the body, and means by which the upper end of the bit can be connected into a drill string. A drilling fluid flow passageway extends axially through the main body and provides flow of drilling fluid to the drilling face. A plurality of hydraulic actuated stabilizing members are arranged circumferentially about the throat and within the main body. Stabilizing members have a borehole wall engaging face thereon which can be retracted flush with the outer surface of the main body, and extended away from the main body face and into con- tact with the borehole wall, thereby stabilizing the drill bit as the bit is rotated while making hole. Hydraulic means is con- nected to the stabilizing members by which the members are pro- gressively extended toward the borehole wall as the members become worn, and which normally prevents retraction of the stabilizing members so long as drilling fluid pressure is effected within the passageway. The stabilizing members are retracted when the drilling fluid is reduced to a predetermined value.
544961
Borden Ladner Gervais Llp
Raney Richard C.
LandOfFree
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