Patent ID: 8457896
Filing Date: 2013-06-04
Classification: E21B

Abstract:
1. A method of determining at least one location of at least one wellbore casing within a wellbore conductor, the method comprising: providing sensor measurements generated by at least one sensor within the wellbore conductor, the sensor measurements indicative of at least one location of the at least one wellbore casing within the wellbore conductor as a function of position along the wellbore conductor; and calculating, using a processor, the at least one location of the at least one wellbore casing using the sensor measurements and at least one geometric constraint, the at least one geometric constraint originating at least in part from at least one physical parameter of the wellbore conductor, or at least one physical parameter of the at least one wellbore casing, or both, wherein the at least one wellbore casing comprises a first wellbore casing and a second wellbore casing, wherein calculating the at least one location of the at least one wellbore casing comprises: wherein estimating the position comprises: