Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Reexamination Certificate
2005-08-02
2005-08-02
Neuder, William (Department: 3672)
Wells
Pistons, fluid driven into well
Surrounding conduit valve or closure opened by piston
C166S318000
Reexamination Certificate
active
06923255
ABSTRACT:
A by-pass tool to be incorporated in a drill string, in combination with an activating ball assembly operative to adjust the tool between an activated mode and a de-activated mode. The tool has a valve seat engageable by the activating ball assembly to move its sleeve to a by-pass mode which diverts drilling mud from flowing through the housing to a by-pass flow through the by-pass port. The activating ball assembly has a deformable ball of a size sufficient to engage and to be held captive by the salve seat and a weight attached to the ball and operative to assist in movement of the assembly under the action of gravity to engage the ball with the valve seat. The weight has smaller transverse dimensions that the ball so that it moves downwardly through the valve seat and pulls the ball into engagement with the valve seat.
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Madson & Metcalf
Neuder William
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