Pressure core barrel

Details Pressure core barrel Pressure core barrel

1979-07-06

1981-03-17

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

Movable to seal sample receiver at bore bottom pressure

175242, E21B 2500

Patent

active

042561922

ABSTRACT:
This invention relates to improvements in pressure core barrels of the type described in U.S. Pat. No. 3,548,958 wherein a controlled pressure is maintained on a core sample during surfacing. Among the improvements provided by the present invention are an improved arrangement of the pressure control valve, a means for positively latching the assembly (both in the open and closed positions) and the provision of a hydraulic assist for moving the outer barrel to the sealing position. Another feature provides an improved device for flushing of the mud from the core sample while it is under high pressure to facilitate the further sampling of the core after freezing of the section.

REFERENCES:
patent: 2238609 (1941-04-01), Sewell
patent: 2381845 (1945-08-01), Stokes
patent: 2734719 (1956-02-01), Otway
patent: 3548958 (1970-12-01), Blackwell

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