High-strength, high-toughness matrix bit bodies
AssigneeSmith International, Inc.
InventorsDah-Ben Liang, Anthony Griffo, Thomas Oldham, Gregory Lockwood
Life of this patent
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Abstract
A drill bit that includes a bit body formed from a matrix powder and at least one cutting element for engaging a formation, wherein the matrix powder included (a) stoichiometric tungsten carbide particles, (b) cemented tungsten carbide particles, and (c) cast tungsten carbide particles, and wherein after formation with the matrix powder, the bit has an erosion rate of less than 0.001 in/hr, a toughness of greater than 20 ksi(in0.5), and a transverse rupture strength of greater than 140 ksi is disclosed.
Claims26
A drill bit, comprising:
- a bit body formed from a matrix powder, wherein the matrix powder comprised:
- (a) stoichiometric tungsten carbide particles;
- (b) cemented tungsten carbide particles;
- and
- (c) cast tungsten carbide particles;
- at least one cutting element for engaging a formation,
- wherein after formation with the matrix powder, the bit body has:
- an erosion rate of less than 0.001 in/hr;
- a toughness of greater than 20 ksi(in0.5);
- and
- a transverse rupture strength of greater than 140 ksi.
A matrix body, comprising:
- a hard particle phase formed from a matrix powder, wherein the matrix powder comprised:
- (a) stoichiometric tungsten carbide particles having a mesh size between 325 mesh and 625 mesh;
- (b) cemented tungsten carbide particles having a mesh size between 170 mesh and 625 mesh;
- and
- (c) cast tungsten carbide particles having a mesh size between 60 mesh and 325 mesh;
- and
- an infiltration binder.
A method for forming a matrix body, comprising:
- providing a matrix powder, wherein the matrix powder comprises:
- (a) stoichiometric tungsten carbide particles having a mesh size between 325 mesh and 625 mesh;
- (b) cemented tungsten carbide particles having a mesh size between 170 mesh and 625 mesh;
- and
- (c) cast tungsten carbide particles having a mesh size between 60 mesh and 325 mesh;
- and
- infiltrating the matrix powder by an infiltration binder including one or metals or alloys thereof.
Dependencies are inferred from the claim text.