Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1991-12-06
1993-07-06
Britts, Ramon S.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
175326, E21B 1710
Patent
active
052245586
ABSTRACT:
A down hole drilling tool activating mechanism comprising a drill string sub connectable between adjacent lengths of drill string pipe which provides a hollow housing with a central bore, a mandrel having a central bore positioned within the bore of said drill sub and moveable longitudinally within said sub bore between a deactivated position and an activated position and the reverse, said mandrel having a first portion of large diameter exposed to pressure in the central bore upstream from said mandrel and a second portion having a smaller diameter than said first portion exposed to pressure in said bore downstream from said mandrel, and having a seal between the small diameter portion and the bore of said drill sub to isolate said large diameter portion from pressure downstream of said mandrel. Spring means is located between the small diameter of the mandrel and the wall of the drill sub tending to urge the mandrel in a first position against the pressure on said large diameter portion. A ring is provided in sealed relationship between the mandrel and the drill sub having a check valve set to predetermine the minimum pressure at which fluid will flow there through and controlling the pressure exerted on the large diameter portion of the mandrel. A second check valve determines a pressure at which fluid may flow in the opposite direction under pressure from the spring bias means. The mandrel has cam means adapted to engage follower means to control activation and deactivation of the tool.
REFERENCES:
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patent: 3572450 (1971-03-01), Thompson
patent: 4270619 (1981-06-01), Base
patent: 4428626 (1984-01-01), Blau et al.
patent: 4557339 (1985-12-01), Falkner et al.
patent: 4572305 (1986-02-01), Swietlik
patent: 4848490 (1989-07-01), Anderson
patent: 4854403 (1989-08-01), Ostertag et al.
Britts Ramon S.
Tsay Frank S.
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