Brake and wear indicator for expandable downhole tool
AssigneeSchlumberger Technology Corporation
InventorsPhilip Trunk, Balasubramanian Durairajan
Life of this patent
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Abstract
An expandable tool includes a reamer block, a cutting element coupled to the reamer block, and a brake element embedded in the reamer block. The cutting element includes a cutting face extending to a gauge radius of the reamer block. The cutting element has a cutting rake angle formed on a radial plane between the cutting face and a normal line orthogonal to a borehole wall. The brake element includes an engagement face extending less than the cutting diameter. The brake element has a brake rake angle that is different than the cutting rake angle, such as by at least 45°. The brake rake angle is defined between the engagement face and the normal line.
Claims11
A reamer block, comprising:
- a cutting element coupled to the reamer block, the cutting element comprising a cutting face extending to a gauge radius of the reamer block, the cutting element having a cutting rake angle formed on a radial plane of the reamer block between the cutting face and a normal line, the normal line being orthogonal to a borehole wall;
- and
- a brake element embedded in the reamer block at a first radial location, wherein the brake element is oriented such that it increases a weight on reamer (WOR), and wherein the WOR is detectable from a surface location.
Dependencies are inferred from the claim text.