Casing friendly, shearable hardbands and systems and methods for shearing same
AssigneeNational Oilwell Varco, L.P.
InventorMichael Joseph Jellison
Life of this patent
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Abstract
A tool joint comprises a body having a central axis, a first end, and a second end opposite the first end, wherein the body is made of a first material having a first hardness. In addition, the tool joint comprises an annular hardband disposed about the body. The hardband is made of a second material. The second material comprises a base material and a plurality of discrete pellets dispersed throughout the base material. The base material has a second hardness and the pellets have a third hardness. The second hardness is substantially the same as the first hardness. The third hardness is greater than the second hardness and less than the hardness of tungsten carbide.
Claims23
A tool joint, comprising:
- a body having a central axis, a first end, and a second end opposite the first end, wherein the body is made of a first material having a first hardness;
- an annular hardband disposed about the body, wherein the hardband is made of a second material;
- wherein the second material comprises a base material and a plurality of discrete pellets dispersed throughout the base material, wherein the base material has a second hardness and the pellets have a third hardness;
- wherein the second hardness is substantially the same as the first hardness;
- wherein the third hardness is greater than the second hardness and less than the hardness of tungsten carbide.
A system, comprising:
- a blowout preventer including a body, a throughbore in fluid communication with a wellbore, a shear ram, and an actuator configured to move the shear ram from a first positioned retracted from the throughbore and a second position extending across the throughbore;
- a tool joint disposed in the throughbore of the blowout preventer radially adjacent the shear ram;
- wherein the tool joint comprises a body and an annular hardband disposed about the body;
- wherein the body is made from a first material and the hardband is made from a second material;
- wherein the second material includes a base material and a plurality of discrete pellets dispersed throughout the base material;
- wherein the base material has substantially the same hardness as the first material, and the pellets have a hardness greater than 35 HRC and less than 2300 HV.
A method for forming a hardband on a downhole tool, the downhole tool being made of a first material, the method comprising:
- (a) applying a molten base material onto the downhole tool, wherein the base material has a coefficient of thermal expansion that is within 10% of the coefficient of thermal expansion of the first material;
- (b) dispersing a plurality of solid pellets throughout the molten base material, wherein the pellets have a hardness that is greater than a hardness of the base material and less than 2300 HV;
- and
- (c) allowing the molten base material to cool and transition into a solid.
Dependencies are inferred from the claim text.