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US 6,684,949 B1Granted
Drilling mechanics load cell sensor
AssigneeSchlumberger Technology Corporation
InventorsKäte Irene Stabba Gabler, Constantyn Chalitsios
Life of this patent
Estimating the term…
Abstract
A load cell for sensing deformation in a drill collar is provided. The load cell comprises a disc member having one or more arcuate apertures and a deformation sensing element disposed on a side surface of the arcuate apertures. The load cell is capable of sensing such drilling parameters as weight and torque on a drill bit during the drilling operation.
Claims25
A load cell, comprising:
- a disc member having at least two arcuate apertures;
- and
- a deformation sensing element disposed on a side surface of two of the arcuate apertures.
A load cell system, comprising:
- a load cell with a strain gauge;
- and
- load cell circuitry operatively connected to the load cell, the load cell circuitry comprising a non-volatile memory adapted to store load cell calibration data.
A downhole sensor, comprising:
- a drill collar adapted to be disposed around a drill string;
- and
- a load cell disposed in the drill collar, the load cell comprising a disc member with four radial arcuate apertures spaced at about ninety degrees, and at least one arcuate strain gauge disposed in each of a pair of diametrically opposed arcuate apertures, the diametrically opposed arcuate apertures aligned substantially orthogonal to a rotational axis of the drill string.
A method for measuring a deformation, comprising:
- disposing a deformation sensing element in an arcuate aperture in a load cell, the arcuate aperture adapted to amplify a deformation of the load cell;
- placing a differential voltage across the deformation sensing element;
- and
- measuring a change in a resistance of the deformation sensing element related to the deformation of the arcuate aperture.
1 more element
A load cell, comprising:
- means for amplifying a mechanical deformation of the load cell;
- and
- a deformation sensing element disposed on the means for amplifying the mechanical deformation.
Dependencies are inferred from the claim text.