Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With longitudinally spaced valve seats
Patent
1990-02-22
1991-06-04
Dang, Hoang C.
Boring or penetrating the earth
With means movable relative to tool below ground to stop...
With longitudinally spaced valve seats
175236, 175243, 175246, 175317, E21B 2502
Patent
active
050206125
ABSTRACT:
A wire line core barrel inner tube assembly has a latch body with a miximum 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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Boart International Limited
Dang Hoang C.
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