Pressure core barrel flushing system

Details Pressure core barrel flushing system Pressure core barrel flushing system

E - Fixed Constructions

21

B

255/3

E21B 25/00 (2006.01) E21B 25/08 (2006.01)

Patent

CA 1120027

ABSTRACT This invention relates to improvements in pressure core barrels of the type described in U.S. Patent 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 asembly (both in the open and closed positions) and the provison of a hydraulic assist for moving the outer barrel to the sealing position. Another particular feature provides an improved means for flushing drilling mud from the core barrel mechanism with sealing means open and while the core sample is maintained substantially at a pressure at which it was sealed in the bore hole and to facilitate subsequent freezing and removal of the core sample therefrom for analysis.

353277

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