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US 2004/0200640 A1Published application
Nutating single cone drill bit
OwnerAllen Kent Rivesinventor
Life of this patent
Estimating the term…
Abstract
The present invention includes a nutating single cone drill bit which rolls and crushes the bore face without dragging cutters which are not directly engaging the borehole thereby reducing wear and torque on the drill string, and which because of the large thrust bearings can withstand large compressive loading of the drill string assembly on the bit.
Claims22
A nutating single cone drill bit comprising:
- a bit shank to connect to a drill string and providing an eccentric, skewed threaded bore;
- a threaded journal for engagement in the eccentric, skewed threaded bore of the bit shank;
- a cutter body rotatably carried on said journal;
- a plurality of cutter elements affixed to an exterior peripheral side of said cutter body so that a tip of each cutter element is forward an intersection of a central axis of the drill bit body and an axis of rotation of the cutter body and a first chordal distance to the tip of each cutter element from an axis of cutter rotation is longer than a second chordal distance to said tip of each cutter element from an axis of the bit body rotation.
1 more element
A single-cone cutter shell comprising:
- a hemispheric body having a interior surface to support a plurality of bearings on a journal having a rotational axis skewed to a central axis of a drill string;
- and,
- a plurality of cutter elements disposed on an outer surface of said hemispheric body arranged so that a tip of each said tip lies forward a perpendicular plane to a rotational axis of the hemispheric body and each said tip is farther from the rotational axis of the hemispheric body than from the central axis of the drill string.
A single cone rotary drill bit comprising:
- a bit shank configured to connect to a drill string, said bit shank defining a bit axis and including a receptacle bore;
- a journal to be engaged within said receptacle bore, said journal configured to retain a cutter body thereupon, said cutter body defining a rotation axis;
- said rotation axis skewed from said bit axis by a skew angle;
- and
- a plurality of cutter elements mounted upon said cutter body, said cutter elements configured so that a tip of each cutter element is forward a plane defined normal to said cutter axis at an intersection of said cutter axis and said bit axis.
2 more elements
A drill bit comprising:
- a connection to a drillstring, said drillstring defining a drillstring axis;
- a cutter body, said cutter body defining a rotational axis wherein said rotational axis is skewed from said drillstring axis by a skew angle;
- and
- a plurality of cutter elements dispersed about said cutter body, each cutter element having a tip, wherein each tip is forward a plane defined normal to said rotational axis at the intersection of said rotational axis and said drillstring axis.
1 more element
A method to drill a formation, the method comprising:
- attaching a single cone drill bit to a drillstring, the single cone drill bit configured such that a cutter body of the single cone drill bit includes a plurality of cutter elements, each cutter element having a tip forward a plane defined by about an axis of rotation of the cutter body at an intersection of the axis of rotation with an axis of rotation of the drillstring;
- engaging the drillstring with attached single cone drill bit into a bore;
- and
- rotating the drillstring to drill the formation with the single cone drill bit, wherein the cutter body rotates slower than the rotation of the drillstring and the cutter elements crush the formation coming into contact therewith.
1 more element
Dependencies are inferred from the claim text.