Method to Assess Uncertainties and Correlations Resulting From Multi-Station Analysis of Survey Data
First Claim
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1. A method of a drilling a borehole, comprising:
- obtaining errors associated with multi-station survey measurements;
partitioning the obtained errors into a set of estimated errors and a set of considered errors;
determining a post-fit covariance matrix for the estimated errors that includes the effects of the considered errors on the estimated errors; and
altering a drilling parameter of a drill string in the borehole using the post-fit covariance matrix.
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Abstract
A system, method and computer-readable medium for a drilling a borehole is disclosed. Errors associated with multi-station survey measurements are obtained and partitioned into a set of estimated errors and a set of considered errors. A post-fit covariance matrix is determined from the estimated errors and includes the effects of the considered errors on the estimated errors. A drilling parameter of a drill string in the borehole may be altered using the determined post-fit covariance matrix.
12 Citations
28 Claims
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1. A method of a drilling a borehole, comprising:
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obtaining errors associated with multi-station survey measurements; partitioning the obtained errors into a set of estimated errors and a set of considered errors; determining a post-fit covariance matrix for the estimated errors that includes the effects of the considered errors on the estimated errors; and altering a drilling parameter of a drill string in the borehole using the post-fit covariance matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for drilling a borehole, comprising:
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a drill string configured to drill the borehole; and a processor configured to; obtain errors associated with previous downhole survey measurements, partition the obtained errors into a set of estimated errors and a set of considered errors, determine a post-fit covariance matrix for the estimated errors that includes the effects of the considered errors on the estimated errors; and alter a drilling parameter of the drill string using the post-fit covariance matrix. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A computer-readable medium having a set of instructions stored thereon and accessible to a processor to perform a method of a drilling a borehole, the method comprising:
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obtaining errors associated with multi-station survey measurements; partitioning the obtained errors into a set of estimated errors and a set of considered errors; determining a post-fit covariance matrix for the estimated errors that includes the effects of the considered errors on the estimated errors; and altering a drilling parameter of a drill string in the borehole using the post-fit covariance matrix. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification