Buoyant counterbalancing for drill string

Details Buoyant counterbalancing for drill string Buoyant counterbalancing for drill string

1973-05-18

1976-11-16

Purser, Ernest R.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

175 5, 254172, E21B 1908

Patent

active

039918378

ABSTRACT:
A fluid actuated counterbalancing apparatus and method for maintaining substantially constant height of the upper end of a string of members suspended from a vessel floating on a body of water wherein such position is controlled by a buoyant element floating in the water in a vertical open ended tube extending downwardly into the body of water to a virtually stable water level.

REFERENCES:
patent: 1817467 (1931-08-01), Thompson
patent: 2292268 (1942-08-01), Gibbons et al.
patent: 2786532 (1957-03-01), Creighton
patent: 2847188 (1948-08-01), Wiltse
patent: 3158206 (1964-11-01), Kammerer
patent: 3177954 (1965-04-01), Rand
patent: 3421581 (1969-01-01), Van Geijn
patent: 3454288 (1969-07-01), Mancusi
patent: 3556231 (1971-01-01), Henderson
patent: 3653635 (1972-04-01), Bates et al.
patent: 3739844 (1973-06-01), Peterman et al.
patent: 3917006 (1975-11-01), Kellner
patent: R27261 (1971-12-01), Bromell et al.

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