Corebarrel
AssigneeDiamant Boart Stratabit S.A.
InventorGraham Clydesdale
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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).
Claims4
A corebarrel having an elongate cylindrical outer casing and an elongate cylindrical liner, the liner being disposed within the outer casing such that there is a space between the liner and the outer casing, the liner comprising a cylindrical wall and having a plurality of unidirectional valves provided in said wall which enable the lateral passage of gas from the volume within the liner to the space between the liner and outer casing, and preventing the passage of fluids from the said space to the said volume.
Dependencies are inferred from the claim text.