Deviation control tool

Details Deviation control tool Deviation control tool

1988-10-31

1990-05-29

Kisliuk, Bruce M.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 48, 175 73, 175 74, E21B 708

Patent

active

049287761

ABSTRACT:
A drill string deflection tool is arranged to function as a segment of drill string. An upper and a lower portion telescope together to form a mid-section with limited telescoping movement and limited angular deflection of the axes of the opposite ends. Axial load compresses the tool and a cam and fulcrum arrangement deflects the tool when it is axially compressed. The tool extends axially when pulled in tension and the axis becomes straight. Drilling fluid pressure acts on rams in the tool to lock it in whatever state exists when pressure is applied. The locking mechanism acts upon the drilling fluid channel to cause a pressure drop, detectable at the surface, that indicates the state of the tool downhole.

REFERENCES:
patent: 2402238 (1946-06-01), Carpenter
patent: 2819039 (1958-01-01), Lindsay et al.
patent: 3457999 (1969-07-01), Massey
patent: 4220214 (1980-09-01), Benoit
patent: 4374547 (1983-02-01), Nguyen et al.
patent: 4596293 (1986-06-01), Wallussek et al.
patent: 4597454 (1986-07-01), Schoeffler
patent: 4655299 (1987-04-01), Schoeffler

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