Boring or penetrating the earth – Bit or bit element – With bit guide or bore wall compacting device
Patent
1998-08-11
2000-10-31
Lillis, Eileen D.
Boring or penetrating the earth
Bit or bit element
With bit guide or bore wall compacting device
1753252, 175425, 175435, E21B 1710
Patent
active
061387800
ABSTRACT:
A rotary earth-boring drag bit assembly has a bit body formed of a carbide matrix material. The body has a longitudinal axis and a face on a lower end containing cutters for engaging and cutting a bottom of the borehole. The cutters are carried on fixed blades extending about and radially outwardly of the face. A steel threaded pin member is bonded to an upper end of the body. A steel shank having a threaded receptacle on a lower end secures to the threaded pin member. The steel shank has a threaded pin on an upper end that secures to a drill string. A lower set of gage pads is disposed about a periphery of the body and extends longitudinally away from the face for engaging a sidewall of the borehole. Each of the gage pads is contiguous with and extends from one of the blades. The gage pads are elongated in an axial direction and protrude from the periphery. Slots are located between the gage pads for the flow of drilling fluid and cuttings. An upper set of gage pads is disposed about and protrudes from the shank. The upper set of gage pads is spaced longitudinally from and rotationally offset from the lower set of gage pads. The upper set of gage pads is elongated in an axial direction and circumferentially spaced apart from each other. Slots are located between the upper set of gage pads for the flow of drilling fluid and cuttings.
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Baker Hughes Incorporated
Bradley James E.
Lee Jong-Suk
Lillis Eileen D.
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