Method for estimating a position in a wellbore

Details Method for estimating a position in a wellbore Method for estimating a position in a wellbore

E - Fixed Constructions

21

B

E21B 47/00 (2006.01) E21B 47/022 (2006.01) E21B 47/09 (2006.01)

Patent

CA 2409238

A method is disclosed which utilizes multiple overlapping surveys to estimate a position in a wellbore and related position uncertainty. Multiple surveys are often taken over the same portion of a wellbore either concurrently or sequentially and/or using various instruments. Each survey generates an estimated survey position and related uncertainty for a given location in the wellbore. By combining the estimated survey positions and uncertainties for these overlapping surveys, a resultant position and related ellipsoid of uncertainty is estimated. This resultant position estimates a position in the wellbore by incorporating the estimated survey positions and uncertainties of multiple overlapping surveys.

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