Boring or penetrating the earth – With means movable relative to tool or shaft to control...
Reexamination Certificate
2003-08-29
2008-03-25
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
With means movable relative to tool or shaft to control...
C166S318000, C175S237000
Reexamination Certificate
active
07347289
ABSTRACT:
A by-pass tool is provided which has a large bore throughflow passage when in an inactive drilling mode, and which is capable of being activated upon launching of an activation dart from the surface, to an active mode in which drillstring fluids can be diverted to a by-pass port. The by-pass tool includes a casing, a by-pass port for diverting drillstring fluids when the tool is in the active mode, and an axially slidable member placed within the casing to slide between blocking and release positions with respect to the by-pass port. The slidable member may be moved to the release position by the dart to bring ports in the slidable member into registry with the by-pass port. This slidable member may also return to its blocking position and thereby cause the tool to revert to its inactive mode upon wireline retrieval of the dart.
REFERENCES:
patent: 2307983 (1943-01-01), Barnes
patent: 3814180 (1974-06-01), Oliver
patent: 3989114 (1976-11-01), Tschirky et al.
patent: 4176717 (1979-12-01), Hix
patent: 4733723 (1988-03-01), Callegari, Sr.
patent: 2006/0124310 (2006-06-01), Lopez de Carenas et al.
patent: 2006/0207765 (2006-09-01), Hofman
patent: 1295373 (1972-11-01), None
patent: WO 99/22114 (1999-05-01), None
patent: WO 01/06086 (2001-01-01), None
Kirton & McConkie
Thompson Kenneth
Witt Evan R.
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