Fixed bladed bit that shifts weight between an indenter and cutting elements
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, Ronald B. Crockett, Marcus Skeem, Francis Leany, Casey Webb
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Abstract
In one aspect of the present invention, a downhole fixed bladed bit comprises a working surface comprising a plurality of blades converging at a center of the working surface and diverging towards a gauge of the bit, at least on blade comprising a cutting element comprising a superhard material bonded to a cemented metal carbide substrate at a non-planer interface, the cutting element being positioned at a positive rake angle, and the superhard material comprising a substantially conical geometry with an apex comprising a curvature.
Claims14
A fixed bladed drill bit, comprising:
- a working face and a plurality of blades that converge at the center of the working face and diverge radially towards a gauge of the bit;
- a plurality of cutting elements fixed to the plurality of blades, wherein the cutting elements on the working face comprise a plurality of pointed cutting elements comprising a substantially conical geometry with an apex, wherein the apex comprises a curvature;
- an indenter;
- an indenter cutting element secured to the indenter, wherein the indenter cutter element comprises a pointed end that protrudes a distance beyond the apex of a most central pointed cutting element;
- and
- an actuator for moving the indenter along an axis of rotation of the bit with respect to the working face.
A method of drilling a wellbore, comprising the steps of:
- providing a fixed bladed drill bit at the end of a tool string in a well bore, the drill bit comprising at least:
- a working face and a plurality of blades that converge at the center of the working face and diverge radially towards a gauge of the bit;
- an indenter protruding from a face of the drill bit, wherein an indenter cutting element is secured to the indenter;
- and
- at least one pointed cutting element with a conical geometry affixed to the plurality of blades at the working face;
- rotating the drill bit against a formation exposed by the well bore under a weight from the tool string;
- and
- moving the indenter along an axis of rotation of the drill bit with respect to the working face, there by alternatingly shifting the weight from the indenter to the conical geometry of the pointed cutting element while drilling.
Dependencies are inferred from the claim text.