Activating mechanism for controlling the operation of a...

Details Activating mechanism for controlling the operation of a... Activating mechanism for controlling the operation of a...

2011-01-11

2011-01-11

Dang, Hoang (Department: 3672)

Wells

Valves, closures or changeable restrictors

Operated by dropped element

Reexamination Certificate

active

07866397

ABSTRACT:
An activating mechanism for controlling the operation of a downhole tool in a drill string and which is intended to be housed in a portion of the drill string upstream of the downhole tool, in which: the activating mechanism has a first mode in which it allows through-flow of drilling fluid to the downhole tool and a second mode in which through-flow of fluid is blocked; and the activating mechanism has a number of through-flow ports permitting through-flow of drilling fluid in said first mode of the mechanism and which are capable of being blocked by launching a number of flow blocking activator balls down the drill string and which each are of such size and shape that they can block access to said through-flow ports in order to activate the mechanism to the second mode and thereby adjust the downhole tool from one mode of operation to another.

REFERENCES:
patent: 2638988 (1953-05-01), Williams
patent: 2647727 (1953-08-01), Edwards
patent: 5484107 (1996-01-01), Holmes
patent: 6253861 (2001-07-01), Carmichael
patent: 6923255 (2005-08-01), Lee
patent: 7640991 (2010-01-01), Leising
patent: 2004/0099447 (2004-05-01), Howlett et al.
patent: 0190529 (2001-11-01), None
patent: 02061236 (2002-08-01), None
patent: 2004022907 (2004-03-01), None

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