Core sample taking bullet construction

Details Core sample taking bullet construction Core sample taking bullet construction

1984-08-30

1987-10-27

Leppink, James A.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing control mechanically actuated in bore

175 58, 175405, E21B 4902

Patent

active

047023279

ABSTRACT:
In the preferred and illustrated embodiment of the core sample bullet construction, a multi-piece construction is set forth. There is a forward, or removable, nose portion. It nests with and connects to a carrier portion. The two portions together define an elongate central bore formed in multiple portions, and the bore is open through the rear of the carrier. At the rear, a separate and removable bottom cap is plugged into the carrier portion and the two are joined together at the time of assembly, before firing. A release ring is included on the outer face of the nose portion and protects the shoulder of the carrier portion, engaging the formation upon entry, and is sacrifically abandoned; the ring is a mechanism for releasing the nose portion whereby retraction is easily obtained; the release ring includes drilling mud and debris relieving notches formed in the inside diameter.

REFERENCES:
patent: 2334428 (1943-11-01), Miller
patent: 3072202 (1963-01-01), Brieger
patent: 3220490 (1965-11-01), Urbanosky et al.
patent: 3329217 (1967-07-01), Urbanosky
patent: 4280568 (1981-07-01), McPhee et al.
J. Toney and J. L. Speights, "Coring", World Oil, Aug. 1, 1985, p. 31.
Schlumberger, "Sidewall Sampling", Ad, 1939, p. 2.

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