G - Physics – 01 – N
Patent
G - Physics
01
N
116/66.3
G01N 9/00 (2006.01) E21B 10/22 (2006.01) E21B 12/02 (2006.01)
Patent
CA 1237952
ABSTRACT OF THE INVENTION A method and apparatus for detecting wear of a rotatable bit used to drill a wellbore is disclosed. In drilling operations, a drilling fluid is pumped down through a drill stem and is discharged through ports in the drill bit and into the annulus between the drill stem and the wellbore. Excessive wear of the bit at a selected location is detected by a sensor which is linked to a restrictive device capable of reducing the flow of drilling fluid through at least one port. To detect excessive wear of the bit, at least one abradable sensor is located in the bit at a selected location. As the drill bit wears at the location, the sensor will abrade until the sensor is activated. Activation of the sensor is transmitted by a communication device such as a wire or hydraulic fluid to manipulate the restricting device. More than one sensor may be simultaneously linked to the restricting device with communication devices to detect wear of the drill bit at differing locations.
473206
Borden Ladner Gervais Llp
Exxon Production Research Company
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