Method of determining travel time in drill string

Details Method of determining travel time in drill string Method of determining travel time in drill string

1993-08-27

1994-12-27

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

3408544, G01V 140

Patent

active

053771613

ABSTRACT:
During a drilling operation, the vibrational energy produced by a drill bit cutting through the earth excites a drill string and the energy near the top of the drill string is mounted by a transducer. A reflection coefficient series is derived from the transducer output such that each reflection coefficient corresponds to a drill string impedance discontinuity. One of the reflection coefficients is identified with a predetermined point of the drill string and energy travel time in the drill string is determined from the position of the one reflection coefficient in the series to the position in the series of a further coefficient.

REFERENCES:
patent: 4829489 (1989-05-01), Rector
patent: 5138875 (1992-08-01), Booer

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