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US 2012/0055711 A1Published application
Wall contact caliper instruments for use in a drill string
AssigneeSchlumberger Technology Corporation
InventorsJames C. Brannigan, Raymond V. Nold, III, John C. Rasmus, Fernando Garcia-Osuna, Alexander Zazovsky
Life of this patent
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Abstract
A drill string caliper includes a mandrel configured to be coupled within a drill string. At least one laterally extensible arm is coupled to an exterior of the mandrel. A biasing device is configured to urge the at least one arm into contact with a wall of a wellbore. A sensor is configured to generate an output signal corresponding to a lateral extent of the at least one arm.
Claims20
A system for use in a wellbore comprising
- a drill string comprising a plurality of pipe joints;
- a laterally extendible arm coupled to the drill string and extendable to a wall of the wellbore;
- a biasing device configured to urge the laterally extendible arm toward the wall of the wellbore;
- and
- a first sensor connected to the biasing device or the laterally extendible arm to measure a property of a formation about the wellbore.
2 more elements
A system for use in a wellbore comprising:
- a caliper positionable on a drill string comprising:
- a laterally extending arm configured to contact a wall of the wellbore;
- an actuator to control movement of the laterally extending arm between an extended position and a retracted position, the extended position being closer to the wall of the wellbore than the retracted position;
- and
- a sensor connected to the actuator or the laterally extending arm to measure a property of a formation about the wellbore.
2 more elements
A method comprising:
- deploying a caliper into a wellbore;
- actuating the caliper to extend a laterally extending arm to contact a wall of the wellbore;
- and
- communicating a position of the caliper or a property of a formation about the wellbore to the Earth's surface.
1 more element
Dependencies are inferred from the claim text.