Corebarrel

Details Corebarrel Corebarrel

1991-09-13

1993-05-11

Dang, Hoang C.

Boring or penetrating the earth

With means movable relative to tool to receive, retain, or...

166325, 175239, E21B 2500

Patent

active

052093107

ABSTRACT:
A system is described which enables the safe release of formation gases when corebarrel is being raised. A corebarrel has an elongate cylindrical outer casing (1) and an elongate cylindrical liner (2), the liner (2) being disposed within the outer casing (1) such that there is a space (3) between the liner and the outer casing. The liner (2) has a plurality of unidirectional valves (4) which enable the passage of gas from the volume (5) within the liner (2) to the space (3) between the liner and outer casing, and prevent the passage of fluids from the space (3) to the volume (5).

REFERENCES:
patent: 1626249 (1927-04-01), Moran et al.
patent: 3139142 (1964-06-01), Chisholm et al.
patent: 3334697 (1967-08-01), Edwards et al.

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