Anti-sticking tool for drill pipe

Details Anti-sticking tool for drill pipe Anti-sticking tool for drill pipe

1976-07-12

1977-08-23

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

308 4A, E21B 1710

Patent

active

040434109

ABSTRACT:
A tool for use on sections of a drill string which utilizes the "journal bearing effect" to minimize the possibility of the drill string becoming stuck against the side of the wellbore due to differential pressures between the wellbore and the formation. The anti-sticking tool is designed to surround part of a section of the drill string, and to have holes passing therethrough, so that the pressure of the drilling fluids within the wellbore in combination with the rotation of the drill string against the inside surface of the tool causes the drilling fluids to be pushed out through these openings to prevent drill string contact and sticking against the side of the wellbore. The anti-sticking tool can take the shape of a plurality of collars spaced along a drill string section or one continuous helical spring extending part of the length of a section of drill string.

REFERENCES:
patent: 1616666 (1927-02-01), Nebergall
patent: 2368415 (1945-01-01), Grant
patent: 2694551 (1954-11-01), Snyder
patent: 2696973 (1954-12-01), Baumgartner
patent: 2754160 (1956-07-01), Owen
patent: 3085639 (1963-04-01), Fitch
patent: 3164216 (1965-01-01), Hall, Sr. et al.
patent: 3197262 (1965-07-01), Fairchild
patent: 3420323 (1969-01-01), Owens

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