DETERMINING GRAVITY TOOLFACE AND INCLINATION IN A ROTATING DOWNHOLE TOOL
First Claim
1. A system for determining gravity toolface and inclination, comprising:
- a downhole tool;
a sensor assembly disposed in a radially offset location within the downhole tool, wherein the sensor assembly comprises three accelerometers and an angular rate sensing device;
a processor in communication with the sensor assembly, wherein the processor is coupled to at least one memory device containing a set of instruction that, when executed by the processor, cause the processor toreceive an output from the sensor assembly;
determine at least one of a centripetal acceleration and a tangential acceleration of the downhole tool based, at least in part, on the output; and
determine at least one of a gravity toolface and inclination of the downhole tool using at least one of the centripetal acceleration and the tangential acceleration.
3 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for determining gravity toolface and inclination are described herein. An example may comprise a downhole tool (300) and a sensor assembly (330, 340, 350) disposed in a radially offset location within the downhole tool. The sensor assembly may comprise three accelerometers and an angular rate sensing device. A processor (402a) may be in communication with the sensor assembly and may be coupled to at least one memory device (402b). The memory device may contain a set of instruction that, when executed by the processor, cause the processor to receive an output from the sensor assembly; determine at least one of a centripetal acceleration (r) and a tangential acceleration (a) of the downhole tool based, at least in part, on the output; and determine at least one of a gravity toolface and inclination of the downhole tool using at least one of the centripetal acceleration and the tangential acceleration.
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Citations
20 Claims
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1. A system for determining gravity toolface and inclination, comprising:
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a downhole tool; a sensor assembly disposed in a radially offset location within the downhole tool, wherein the sensor assembly comprises three accelerometers and an angular rate sensing device; a processor in communication with the sensor assembly, wherein the processor is coupled to at least one memory device containing a set of instruction that, when executed by the processor, cause the processor to receive an output from the sensor assembly; determine at least one of a centripetal acceleration and a tangential acceleration of the downhole tool based, at least in part, on the output; and determine at least one of a gravity toolface and inclination of the downhole tool using at least one of the centripetal acceleration and the tangential acceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for determining gravity toolface and inclination, comprising:
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a downhole tool; a first sensor assembly disposed in a first radially offset location within the downhole tool, wherein the first sensor assembly comprises a first accelerometer and a second accelerometer; a second sensor assembly disposed in a second radially offset location within the downhole tool, wherein the second sensor assembly comprises a third accelerometer and a fourth accelerometer; a processor in communication with the first sensor assembly and the second sensor assembly, wherein the processor is coupled to at least one memory device containing a set of instruction that, when executed by the processor, cause the processor to receive a first output from the first sensor assembly and a second output from the second sensor assembly; determine at least one of a centripetal acceleration and a tangential acceleration of the downhole tool based, at least in part, on the first output and the second output; and determine at least one of a gravity toolface and inclination of the downhole tool using at least one of the centripetal acceleration and the tangential acceleration. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for determining gravity toolface and inclination, comprising:
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positioning a downhole tool within a borehole, wherein; the downhole tool comprises a sensor assembly disposed in a radially offset location within the downhole tool; and the sensor assembly comprises at least two accelerometers and an angular rate sensing device; determining at least one of a centripetal acceleration and a tangential acceleration of the downhole tool based, at least in part, on an output of the sensor assembly; and determining at least one of a gravity toolface and an inclination of the downhole tool using at least one of the centripetal acceleration and the tangential acceleration. - View Dependent Claims (17, 18, 19, 20)
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Specification