Method and apparatus for formation sampling during the drilling

Details Method and apparatus for formation sampling during the drilling Method and apparatus for formation sampling during the drilling

1993-07-07

1995-08-29

Bagnell, David J.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing control mechanically actuated in bore

175 44, E21B 4904

Patent

active

054452287

ABSTRACT:
A tool for obtaining samples of the formation surrounding the wellbore, and method of obtaining such samples, is disclosed. The tool is implemented within a sub in a bottomhole assembly, preferably within side-pocket mandrels in the outer surface of drill collar pipe. The tool includes a series of sampling bits that may be fired into the surrounding formation by the activation of an explosive charge, and also includes an electronic unit for detecting a signal from the surface and activating the charge in response thereto. The signal may be communicated by way of mud-pulse telemetry, or by any other known telemetry technique. Separate groups of sampling bits, with separate switch and power units, may be provided to provide redundant operation; a decoder is included in this alternative, to allow for selection of one of the groups.

REFERENCES:
patent: 3227228 (1966-01-01), Bannister
patent: 4004642 (1977-01-01), Dardick
patent: 4474250 (1984-10-01), Dardick
patent: 4609056 (1986-09-01), Colle, Jr. et al.
Wolk, "The Mechanics of Sidewall Sampling", Technical Memorandum, vol. 7, No. 1 (Dresser Atlas, Mar. 1976), pp. 1-12.
Honeybuorne, "Measurement While Drilling", Symposium on the 75th Anniversary of the Oil Technology Course at the Royal School of Mines (1988).
Sales information regarding "CST Sidewall Sampler" (Schlumberger, undated).
Bonner, et al., "Logging While Drilling: A Three-Year Perspective", Oilfield Review (Elsevier, Jul. 1992), pp. 4-21.
Sales information regarding CORGUN (Western Atlas International, undated).

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