Borehole survey method and apparatus
First Claim
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1. A method, comprising:
- obtaining a first set of survey data at a first point along a wellbore;
estimating a present wellbore position based on at least the first set of survey data;
determining a related ellipse of uncertainty at the present wellbore position;
comparing the related ellipse of uncertainty of the present wellbore position to a threshold;
selecting a methodology for a subsequent survey based on a comparison of the related ellipse of uncertainty to the threshold; and
comparing an actual trajectory of the wellbore to a planned trajectory of the wellbore.
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Abstract
A method includes obtaining a first set of survey data at a first point along a wellbore, estimating a present wellbore position based on at least the first set of survey data, determining a related ellipse of uncertainty at the present wellbore position, comparing the related ellipse of uncertainty of the present wellbore position to a threshold, and selecting a methodology for a subsequent survey based on a comparison of the related ellipse of uncertainty to the threshold.
20 Citations
16 Claims
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1. A method, comprising:
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obtaining a first set of survey data at a first point along a wellbore; estimating a present wellbore position based on at least the first set of survey data; determining a related ellipse of uncertainty at the present wellbore position; comparing the related ellipse of uncertainty of the present wellbore position to a threshold; selecting a methodology for a subsequent survey based on a comparison of the related ellipse of uncertainty to the threshold; and comparing an actual trajectory of the wellbore to a planned trajectory of the wellbore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for continuous direction and inclination in wellbore trajectory surveying and planning, the method comprising:
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obtaining a first set of survey data according to a first survey methodology; obtaining a second set of survey data according to a second survey methodology; calculating a present wellbore position according to at least the first and second sets of survey data, the present wellbore position having a related ellipse of uncertainty; and comparing the ellipse of uncertainty to a threshold; and selecting a methodology for at least a third survey, wherein the first survey methodology consumes more rig time and results in higher accuracy relative to the second survey methodology. - View Dependent Claims (13, 14, 15, 16)
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Specification