Method and apparatus for communicating incremental depth and/or other useful data of a downhole tool
First Claim
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1. A method of drilling a borehole with a downhole assembly, the method comprising:
- storing in the downhole assembly at least one predetermined change in rotational rate correlated to at least one predetermined depth interval;
drilling the borehole with the downhole assembly while successively measuring each of the at least one predetermined depth interval at the surface;
successively detecting, using an angular rate sensor of the downhole assembly, changes from different rotational rates, each of the successively detected changes imparted to the downhole assembly from the surface at each of the at least one predetermined depth interval successively measured at the surface;
determining, using processing circuitry of the downhole assembly, a downhole depth value for the downhole assembly by counting each of the successively detected changes; and
controlling an operation of the downhole assembly based on the determined depth value.
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Abstract
A method and apparatus for communicating incremental depth and/or other useful data of a downhole tool. The incremental depth and/or other useful data of the downhole tool being communicated by measuring at least one change in the downhole system, detecting the change downhole, and subsequently determining the incremental depth and/or other useful data of the downhole tool.
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Citations
25 Claims
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1. A method of drilling a borehole with a downhole assembly, the method comprising:
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storing in the downhole assembly at least one predetermined change in rotational rate correlated to at least one predetermined depth interval; drilling the borehole with the downhole assembly while successively measuring each of the at least one predetermined depth interval at the surface; successively detecting, using an angular rate sensor of the downhole assembly, changes from different rotational rates, each of the successively detected changes imparted to the downhole assembly from the surface at each of the at least one predetermined depth interval successively measured at the surface; determining, using processing circuitry of the downhole assembly, a downhole depth value for the downhole assembly by counting each of the successively detected changes; and controlling an operation of the downhole assembly based on the determined depth value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An assembly for drilling a borehole, comprising:
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a drilling component disposed on the assembly and drilling the borehole with rotation; first storage disposed on the assembly and storing at least one predetermined change in rotational rate correlated to at least one predetermined depth interval; an angular rate sensor disposed on the assembly and detecting the rotation; and first processing circuitry disposed on the assembly and operatively coupled to the first storage and the angular rate sensor, the first processing circuitry counting a downhole depth value of the downhole assembly from successive changes detected in the rotation of the downhole assembly corresponding to the at least one predetermined change in rotational rate correlated to the at least one predetermined depth interval stored in the storage, the successive changes imparted to the downhole assembly from the surface at each of the at least one predetermined depth interval successively measured at the surface. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification