Schlumberger Technology Corporation

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Caroline Humphrey

Ashley Bernard Johnson

Gokturk Tunc

John Mervyn Cook

Michael Paul Barrett

Paul Frederick Cilgrim Dickenson

The operation of rotary equipment carried on elongate structure such as coiled tubing extending into a borehole from the Earth's surface is carried out by providing at least one optical fibre extending downhole to the rotary equipment from the surface, using optical time domain reflectometry to operating the optical fibre as a distributed vibration sensor while the rotary equipment is in operation, and thereby observing vibration created by the rotary equipment.

Observation of vibration of rotary apparatus

Wear sensors are provided on a drill bit or other rotary cutting tool which is for operation in a subterranean borehole and has a plurality of separate cutters protruding from a support structure towards the material to be cut by the tool. The electrically operated sensing means are located at or coupled to a sensing point within a protrusion from the support structure. This sensing point is located within a protrusion such that attrition of at least one cutter to a partially worn state brings the protrusion into abrasive contact with the material being cut and attrition of the protrusion then exposes the sensing point to the material which is being cut by the tool and thereby brings about a detectable change, which may include damage to the sensor at the sensing point, indicative of wear. The tool includes means to communicate data from the sensing means to the surface.

Instrumented rotary tools with attached cutters

Growing community of inventors

Cambridge, United Kingdom

Caroline Humphrey