Brake and wear indicator for expandable downhole tool
AssigneeSchlumberger Technology Corporation
InventorsPhilip Trunk, Balasubramanian Durairajan
Life of this patent
Estimating the term…
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.
Claims12
A drilling system, comprising:
- a processing unit configured to determine when a brake element engages a formation;
- and
- a bottom hole assembly (BHA) comprising an expandable reamer, the expandable reamer comprising a plurality of expandable blocks positioned radially around the expandable reamer, at least one expandable block of the plurality of expandable blocks comprising:
- a plurality of cutting elements coupled to the at least one expandable block, the plurality of cutting elements defining a cutting profile;
- and
- the brake element embedded in the at least one expandable block, the brake element radially extending less than the cutting profile.
A method of operating a drilling system, the method comprising:
- while performing a drilling operation with an expandable reamer and a bit, receiving drilling parameters comprising one or more of:
- a weight on the expandable reamer (WOR);
- a torque on the expandable reamer (TOR);
- and
- a rate of penetration (ROP);
- determining that a brake element of the expandable reamer has engaged a borehole wall by comparing the drilling parameters to one or more thresholds;
- and
- adjusting the drilling operation based on determining that the brake element has engaged the borehole wall.
Dependencies are inferred from the claim text.