Downhole tools with tapered actuators having reduced cyclical torque
AssigneeSchlumberger Technology Corporation
InventorsKjell Haugvaldstad, Neil Cannon
Life of this patent
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Abstract
A downhole tool includes a tool body and an actuator coupled to and selectively extendible relative to the tool body. The actuator has a working face that contacts a downhole formation, and which includes an upper portion and a lower portion. The lower portion has a tapered surface that is directed radially inwardly and axially downwardly relative to the first portion, with at least a portion of the tapered surface including an ultrahard material having a different coefficient of friction as compared to a first material of the upper portion.
Claims20
A downhole tool, comprising:
- a tool body;
- and
- an actuator coupled to and selectively extendible relative to the tool body, the actuator including a working face arranged and designed to contact a downhole formation, the working face including:
- an upper portion including a first material;
- and
- a lower portion, the lower portion including a tapered surface that is directed radially inwardly and axially downwardly relative to the first portion, wherein at least a portion of the tapered surface includes an ultrahard material having a different coefficient of friction than the first material.
A downhole tool, comprising:
- a tool body;
- and
- an actuator coupled to and selectively extendible relative to the tool body, the actuator including a working face arranged and designed to contact a downhole formation, the working face including:
- an upper portion;
- and
- a lower portion having a tapered surface that is directed radially inwardly and axially downwardly relative to the first portion, wherein the upper and lower portions extend an axial length of the working face, and wherein an axial length of the tapered surface is greater than 50% and less than 90% of the axial length of the working face.
Dependencies are inferred from the claim text.