Method and apparatus for electrically determining pipe inside diameter
CA 1203684 A · Owner: Schlumberger Canada Limited · Inventors: Minerbo, Gerald N.; Hazen, Gary A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus is disclosed for electrically measuring the inside diameter of a metallic pipe such as oil or gas well casing. The transimpedance of two coaxial coils within the pipe is determined and then resolved into its inphase and quadrature components. corrected measurement output is generated in response to these two components. A signal representative of the inside diameter of the pipe is generated in response to the corrected measurement output and may be recorded as a function of travel distance in the pipe. The generation of the corrected measurement output may also comprise the simultaneous solution of two non-linear equations which express the magnitudes of the inphase …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 29, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.