Wire line core drilling apparatus

Details Wire line core drilling apparatus Wire line core drilling apparatus

E - Fixed Constructions

21

B

255/3

E21B 25/00 (2006.01) E21B 21/10 (2006.01) E21B 23/02 (2006.01)

Patent

CA 2010534

A wire line core barrel inner tube assembly has a latch body with a maximum diameter portion providing a shoulder seatable on a drill string landing ring and a fluid bypass channel extending through the maximum diameter portion and a valving assembly. The valving assembly includes a resilient valve seat in the bypass channel and a ball seatable on the valve seat to block fluid flow in a downward direction through the channel, movable upwardly off the valve seat from the seated position to permit fluid flow through the seat in the opposite direction and movable through the seat to a channel open condition after a preselected fluid pressure has been exerted on the ball in a direction to move the ball from the ball seated position and through the valve seat.

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