Method of recovering data acquired and stored down a well, by an

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing

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367 81, 3408537, 3408544, 3408549, G01V 140, E21B 4712

Patent

active

059149116

ABSTRACT:
In a well (10) in production or undergoing tests, the recovery of data acquired and stored in a downhole unit (16) located in the lower part of a drillpipe string (12) below a test valve (20) is effected directly in the form of acoustic signals between the downhole unit (16) and an interface tool (24). To this end, acoustic coupling is established between the tool (24) and the drillpipe string (12), and electro-acoustic transducers are provided in the tool and in the downhole unit (16). Commands are transmitted in the opposite direction, also in the form of acoustic signals, in particular to initiate data recovery. The transmission of data and commands between the tool (24) and the surface unit (22) is effected by any known means, for example in the form of electrical signals carried by a cable (26).

REFERENCES:
patent: 2370818 (1945-03-01), Silverman
patent: 3209323 (1965-09-01), Grossman, Jr.
patent: 4770034 (1988-09-01), Titchener et al.
patent: 4992997 (1991-02-01), Bseisu
patent: 5160925 (1992-11-01), Dailey et al.
patent: 5278550 (1994-01-01), Rhein-Knudsen et al.
patent: 5410303 (1995-04-01), Comeau et al.
patent: 5602541 (1997-02-01), Comeau et al.

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