Patent ID: 11946360
Assignee: MAGNETIC VARIATION SERVICES, LLC
Field: Civil engineering (Other fields)
Classification: CPC E  G | IPC E  G

Claim 12:
13. A method, comprising:
(a) for a subject wellbore, generating, by a computer system, a misfit curve between stratigraphic vertical depth of at least one offset wellbore, SVDow, a measured depth of the subject wellbore, MDSW;
(b) based on the misfit curve, calculating, by the computer system, a plurality of likelihoods that respective target measured depths for the subject wellbore, TMDsw, are equal to or within a tolerance of respective stratigraphic vertical depths of the subject wellbore, SVDsw, respectively corresponding to a plurality of interpretations of the stratigraphic vertical depth of the subject wellbore, SVDsw, based on a subject well log for the subject wellbore and an offset well log respectively for the at least one offset wellbore, wherein the interpretations are paths through the misfit curve;
(c) assigning, to the subject wellbore by the computer system, a likelihood calculated using a starting measured depth of the subject wellbore, MDSW1, and the target measured depth for the subject wellbore, TMDsw, from the plurality of likelihoods that a target measured depth for the subject wellbore, TMDsw, is equal to or within a tolerance of a stratigraphic vertical depth of the subject wellbore, SVDsw, associated with the target measured depth for the subject wellbore, TMDsw; and
(d) based on the misfit curve and the assigned likelihood, adjusting, by the computer system, at least one drilling parameter during drilling of the subject wellbore.