Wired pipe depth measurement system

Details Wired pipe depth measurement system Wired pipe depth measurement system

2007-08-28

2011-10-18

Edwards, Jr., Timothy (Department: 2612)

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

C340S854100, C340S854400, C340S854900

Reexamination Certificate

active

08040755

ABSTRACT:
A method and apparatus for estimating a change in length of a wellbore conveyance device in a wellbore. A reference signal is sent along a first path and a wellbore signal having a phase relationship with the reference signal is sent along a wellbore path. A change in length of the wellbore conveyance device is estimated from a phase shift between the reference signal and the wellbore signal. The frequency of the wellbore signal may be changed downhole. The wellbore conveyance device may have at least one conductor under a maintained tension. A length of the wellbore conveyance device is estimated from the estimated change in the length. For a drill string composed of a plurality of wellbore tubulars, a phase shift of the drill sting is determined upon adding a wellbore tubular to the drill string.

REFERENCES:
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patent: 5541587 (1996-07-01), Priest
patent: 7301853 (2007-11-01), Coffey
patent: 160356 (1985-11-01), None
patent: 2329722 (1999-03-01), None

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