Constant bottom contact tool

Details Constant bottom contact tool Constant bottom contact tool

1980-03-07

1981-11-17

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

175317, 175 65, 175322, E21B 3412, E21B 1707

Patent

active

043006361

ABSTRACT:
A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means are supported on the drill string and engaged with the helical groove means. Spring means is supported by the drill string and abuts the mandrel to tend to urge the mandrel longitudinally out of the drill string whereby the bit is urged into substantially continuous contact with the well bore bottom as the drill string is rotated during drilling operations. Valve means are provided for selectively circulating fluids from the drill string to the well bore above the drill bit, and when desired jar means may be incorporated in the drill string to impart an up or down jar thereto should the drill string become stuck or tend to become stuck during drilling operations.

REFERENCES:
patent: 1619328 (1927-03-01), Benckenstein
patent: 1785086 (1930-12-01), Hauk
patent: 2168735 (1939-08-01), Gilstrap
patent: 2312018 (1943-02-01), Beckman
patent: 2805043 (1957-09-01), Williams, Jr.
patent: 3853177 (1974-10-01), Mott

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