Determining gravity toolface and inclination in a rotating downhole tool
First Claim
1. A system for controlling a drilling operation by determining gravity toolface and inclination, comprising:
- a downhole tool comprising an internal bore through which a drilling fluid passes during a drilling operation in a borehole;
a steering assembly;
a sensor assembly disposed in a radially offset location within the downhole tool, wherein the radially offset location is relative to a longitudinal axis of the downhole tool, wherein the sensor assembly consists of a three-axis accelerometer package and an angular rate sensing device, wherein the three-axis accelerometer package comprises three accelerometers, and wherein the angular rate sensing device senses an angular velocity of the downhole tool; and
a processor in communication with the sensor assembly and the steering 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 a centripetal acceleration of the downhole tool based, at least in part, on the output;
determine a tangential acceleration of the downhole tool based, at least in part, on a first output at a first time from the angular rate sensing device and a second output at a second time from the angular rate sensing device, wherein a digital filter is implemented to determine at least one of the centripetal acceleration and the tangential acceleration;
determine at least one of the gravity toolface and the inclination of the downhole tool using at least one of the centripetal acceleration and a tangential acceleration; and
alter at least one of a direction and a rotation of the steering assembly based, at least in part, on the at least one of the gravity toolface and inclination.
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.
37 Citations
18 Claims
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1. A system for controlling a drilling operation by determining gravity toolface and inclination, comprising:
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a downhole tool comprising an internal bore through which a drilling fluid passes during a drilling operation in a borehole; a steering assembly; a sensor assembly disposed in a radially offset location within the downhole tool, wherein the radially offset location is relative to a longitudinal axis of the downhole tool, wherein the sensor assembly consists of a three-axis accelerometer package and an angular rate sensing device, wherein the three-axis accelerometer package comprises three accelerometers, and wherein the angular rate sensing device senses an angular velocity of the downhole tool; and a processor in communication with the sensor assembly and the steering 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 a centripetal acceleration of the downhole tool based, at least in part, on the output; determine a tangential acceleration of the downhole tool based, at least in part, on a first output at a first time from the angular rate sensing device and a second output at a second time from the angular rate sensing device, wherein a digital filter is implemented to determine at least one of the centripetal acceleration and the tangential acceleration; determine at least one of the gravity toolface and the inclination of the downhole tool using at least one of the centripetal acceleration and a tangential acceleration; and alter at least one of a direction and a rotation of the steering assembly based, at least in part, on the at least one of the gravity toolface and inclination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a drilling operation by determining gravity toolface and inclination, comprising:
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positioning a downhole tool comprising an internal bore through which a drilling fluid passes during a drilling operation within a borehole, wherein; the downhole tool comprises a sensor assembly disposed, wherein the sensor assembly is in a radially offset location within the downhole tool, wherein the radially offset location is relative to a longitudinal axis of the downhole tool; the downhole tool comprises a steering assembly; and the sensor assembly consisting of a three-axis accelerometer package and an angular rate sensing device, wherein the three-axis accelerometer package comprises three accelerometers, wherein the angular rate sensing device senses an angular velocity of the downhole tool; determining a centripetal acceleration of the downhole tool based, at least in part, on an output of the sensor assembly; determining a tangential acceleration of the downhole tool based, at least in part, on a first output at a first time from the angular rate sensing device and a second output at a second time from the angular rate sensing device, wherein a digital filter is implemented to determine at least one of the centripetal acceleration and the tangential acceleration; determining at least one of the gravity toolface and the inclination of the downhole tool using at least one of the centripetal acceleration and a tangential acceleration; transmitting the at least one of the gravity toolface and the inclination to a steering control, wherein the steering control alters at least one of a direction and a rotation of the steering assembly based, at least in part, on the at least one of the gravity toolface and the inclination. - View Dependent Claims (10, 11, 12)
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13. A system for controlling a drilling operation by determining gravity toolface and inclination, comprising:
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a downhole tool comprising an internal bore through which a drilling fluid passes during a drilling operation in a borehole; a steering assembly; a first sensor assembly disposed in a first radially offset location within the downhole tool, wherein the first radially offset location is relative to a longitudinal axis of the downhole tool, wherein the first sensor assembly is implemented on a first printed circuit board (PCB), wherein the first sensor assembly consists of 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 radially offset location is relative to a longitudinal axis of the downhole tool, wherein the second sensor assembly is implemented on a second PCB, wherein the second sensor assembly consists of a third accelerometer and a fourth accelerometer; and a processor in communication with the steering assembly, 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; receive a second output from the second sensor assembly; determine a centripetal acceleration of the downhole tool based, at least in part, on the first output and the second output; determine a first tangential acceleration of the downhole tool based, at least in part, on the first output, wherein a digital filter is implemented to determine at least one of the centripetal acceleration and the first tangential acceleration; determine at least one of the gravity toolface and the inclination of the downhole tool using at least one of the centripetal acceleration and a tangential acceleration; and alter at least one of a direction and a rotation of the steering assembly based, at least in part, on the least one of the gravity toolface and inclination. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification