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US 2011/0079444 A1Published application
External, Divorced PDC Bearing Assemblies for Hybrid Drill Bits
AssigneeBaker Hughes Incorporated
InventorAjay V. Kulkarni
Life of this patent
Estimating the term…
Abstract
A hybrid-type earth boring drill bit is described having fixed cutting blades and rolling cones with cutting elements, wherein the rolling cones are associated with a spindle assembly that may be optionally divorced from the head pin assembly, and which includes bearing members that further include a plurality of polycrystalline diamond elements.
Claims6
A drill bit, comprising:
- a bit body having an axis, an axial center, and at least one fixed blade extending in the axial direction downwardly from the bit body;
- at least one rolling cutter mounted to the bit body;
- at least one rolling-cutter cutting element arranged on the rolling cutter and radially spaced apart from the axial center;
- a plurality of fixed cutting elements arranged on the fixed blades and at least one of the fixed cutting elements is located near an axial center of the bit body and adapted to cut formation at the axial center;
- and
- a bearing assembly comprising a plurality of PDC-faced bearing elements.
3 more elements
A hybrid drill bit for use in drilling through subterranean formations, the hybrid drill bit comprising:
- a shank disposed about a longitudinal centerline and adapted to be coupled to a drilling string;
- at least one fixed blade extending from the shank, the fixed blade comprising at least one cutting element extending from a surface of the fixed blade;
- a bearing assembly comprising a plurality of PDC-faced bearing elements;
- and
- at least two rolling cutter legs extending downwardly from the shank, the legs comprising a cantilevered bearing shaft extending inwardly and downwardly and having an axis of rotation, the spindle assembly comprising:
- at least two rolling cutters mounted for rotation on the bearing shaft, adapted to rotate about the axis of rotation on the journal and pilot pin, the rolling cutters comprising a plurality of cutting elements extending from an external surface of the rolling cutter.
3 more elements
A bearing assembly for use with a roller cone on an earth boring drill bit, the bearing assembly comprising:
- a substantially cylindrically-shaped bearing assembly having a substantially cylindrical recess formed within the body of the assembly and extending from the base of the bearing assembly inwardly in an axial manner towards the nose region of the assembly, and, a journal region, a pin region, a ball race, and a thrust shoulder region intermediate between the journal region and the pin region;
- a first cylindrical surface region on the exterior of the journal region, and a second cylindrical surface region on the exterior of the pin region;
- a plurality of PDC bearing elements mounted on the external surface of the journal region, the pin region, and/or the thrust shoulder region;
- wherein the bearing assembly is externally divorced from the spindle assembly of the drill bit, and
- wherein the recess in the bearing assembly is shaped and sized to receive a head pin extending from the spindle region of the drill bit.
2 more elements
An earth-boring bit comprising:
- a bit body having a central axis and at least one fixed blade extending axially from the bit body, the fixed blade having a radially outermost gage surface;
- a plurality of fixed-blade cutting elements extending from the gage surface to substantially the central axis of the bit body, the fixed-blade cutting elements being arranged to remove formation at a center and sidewall of a borehole during drilling operation;
- at least one rolling cutter mounted for rotation on the bit body, the rolling cutter including a plurality of rolling-cutter cutting elements arranged on the cutter to remove formation between the center and the sidewall of the borehole during drilling operation;
- and
- a bearing assembly as described herein.
2 more elements
A drill bit that includes at least one roller cone, the drill bit comprising:
- a main bit body with at least one downwardly extending leg, the leg having at least one journal thereon, the journal having a cylindrically-shaped main journal bearing surface which comprises polycrystalline diamond;
- a roller cone rotatively mounted on each journal, the roller cone having a main roller cone bearing surface formed on the interior of the cone which mates with the main journal bearing surface, both of which comprise a plurality of polycrystalline diamond bearing elements;
- and
- means for maintaining the two bearing surfaces in a state of compression against each other.
1 more element
Dependencies are inferred from the claim text.