Reduction of the frictional coefficient in a borehole by the use

Details Reduction of the frictional coefficient in a borehole by the use Reduction of the frictional coefficient in a borehole by the use

1980-11-28

1983-05-24

Purser, Ernest R.

Boring or penetrating the earth

Natural vibration characteristic of an element of boring...

175 61, 166301, E21B 3100, E21B 1700

Patent

active

043846254

ABSTRACT:
A deviated borehole is drilled with a rotary drilling technique in which the drill string is vibrated at a suitable frequency and amplitude to reduce the friction of the drill string against the lower side of the borehole and to promote the free movement of the drill string therein.

REFERENCES:
patent: 2271005 (1942-01-01), Grebe
patent: 2730176 (1956-01-01), Herbold
patent: 2972380 (1961-02-01), Bodine, Jr.
patent: 3049185 (1962-08-01), Herbold
patent: 3132707 (1964-05-01), Alexander
patent: 3152642 (1964-10-01), Bodine, Jr.
patent: 3168140 (1965-02-01), Bodine, Jr.
patent: 3191683 (1965-06-01), Alexander
patent: 3360056 (1967-12-01), Bodine, Jr.
patent: 4058163 (1977-11-01), Yandell
patent: 4243112 (1981-01-01), Sartor

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