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US 8,281,882 B2Granted
Jack element for a drill bit
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, Francis E. Leany, Joe Fox, Tyson J. Wilde
Life of this patent
Estimating the term…
Abstract
A drill bit has an axis of rotation and a working face with a plurality of blades extending outwardly from a bit body. The blades form, in part, an inverted conical region, and a plurality of cutters with a cutting surface is arrayed along the blades. A jack element is coaxial with the axis of rotation and extends within the inverted conical region within a range defined by the cutting surface of at least one cutter.
Claims12
A drill bit, comprising:
- a shank;
- a bit body attached to said shank, said bit body having an axis of rotation, said bit body including:
- a working face having a plurality of blades extending outwardly therefrom, said plurality of blades forming an inverted conical region;
- a plurality of cutters positioned on said plurality of blades, said plurality of cutters including:
- a first cutter having a first point most distant from said working face relative to said plurality of cutters;
- a second cutter proximate said axis of rotation, said second cutter having a another point nearest said working face relative to said plurality of cutters;
- a pocket formed within said working face;
- a channel connecting said pocket to a bore of said drill bit;
- and,
- a jack element disposed within said pocket, said jack element having a distal end within said inverted conical region, said distal end extending away from said working face a distance between said first point and said second point, said jack element limiting a depth to which at least one of said plurality of cutters engages a formation.
7 more elements
A drill bit, comprising:
- a shank;
- a bit body attached to said shank, said bit body having an axis of rotation, said bit body including:
- a working face having a plurality of blades extending outwardly therefrom, said blades forming an inverted conical region;
- a plurality of cutters positioned on said plurality of blades, said plurality of cutters including a cutter proximate said axis of rotation, said cutter having a point nearest said working face relative to said plurality of cutters and a diameter extending therefrom to another point;
- a pocket formed within said working face;
- a channel connecting said pocket to a bore of said drill bit;
- and,
- a jack element disposed within said pocket, said jack element having a distal end within said inverted conical region, said distal end extending away from said working face a distance that falls between said point and said another point.
5 more elements
A drill bit, comprising:
- a shank;
- a bit body attached to said shank, said bit body having an axis of rotation, said bit body including:
- a working face having a plurality of blades extending outwardly therefrom, said blades forming an inverted conical region;
- a plurality of cutters positioned on said plurality of blades, said plurality of cutters including at least one cutter configured to a cut a region of a formation to a depth;
- a pocket formed within said working face;
- a channel connecting said pocket to a bore of said drill bit;
- and,
- a jack element disposed within said pocket, said jack element having a distal end within said inverted conical region, said distal end extending away from said working face to a distance within said region.
5 more elements
A drill bit, comprising:
- a shank;
- a bit body attached to said shank, said bit body having an axis of rotation, said bit body including:
- a working face having a plurality of blades extending outwardly therefrom, said blades forming an inverted conical region;
- a plurality of cutters positioned on said plurality of blades, said plurality of cutters including a cutter proximate said axis of rotation, said cutter having a point nearest said working face relative to said plurality of cutters and a diameter extending therefrom to another point;
- a pocket formed within said working face;
- a sleeve brazed into said pocket;
- and,
- a jack element press-fit into said sleeve, said jack element having a distal end within said inverted conical region, said distal end extending away from said working face a distance that falls between said point and said another point.
5 more elements
Dependencies are inferred from the claim text.