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US 9,540,927 B2Granted
High resolution continuous depth positioning in a well bore using persistent casing properties
AssigneeMicro-g LaCoste, Inc.
InventorsEthan H. Mann, Andrew James Black, Aaron J. Schiel
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Abstract
Continuous measurement indicia between casing collars of a pipe segment of a well bore casing is obtained from signals obtained by sensing innate, persistent and unaltered characteristics, e.g. magnetic permeability, of the pipe segment along its length, and using the signals to perform a downhole function, e.g. a gravity measurement, at an indicated location.
Claims32
A method of deriving measurement indicia between casing collars of at least one pipe segment of a casing in a well bore, comprising:
- obtaining intermediate characteristic signals along the length of the pipe segment between the casing collars by sensing variations in innate, persistent and unaltered characteristic properties of the one pipe segment existing continuously along its length between the casing collars;
- distinguishing the intermediate characteristic signals from other signals created by intentionally introduced physical alterations in the pipe segment between the casing collars;
- and
- using the intermediate characteristic signals as indicia of the length of the one pipe segment between the casing collars.
1 more element
Dependencies are inferred from the claim text.