Nutational technique for limiting well bore deviation

Details Nutational technique for limiting well bore deviation Nutational technique for limiting well bore deviation

1988-07-26

1989-12-12

Dang, Hoang C.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175 61, 175325, E21B 710, E21B 1710

Patent

active

048861308

ABSTRACT:
Well bore deviation from vertical is reduced or corrected by inducing a lateral deflection of the drill string at a predetermined location above the drill bit to force the drill bit to return to vertical. The lateral deflection occurs periodically and creates a nutating effect in the drill string which causes the drill bit to angle toward vertical. An eccentrically mounted roller becomes effective when it contacts the low side of a deviated well bore and preferably induces the lateral deflection as it rotates while in contact with the low side of the well bore.

REFERENCES:
patent: 2841366 (1958-07-01), Dunn
patent: 3352370 (1967-11-01), Livingston
patent: 3363704 (1968-01-01), Farris et al.
patent: 3825081 (1974-07-01), McMahon
patent: 4220213 (1980-09-01), Hamilton
patent: 4262758 (1981-04-01), Evans
patent: 4416339 (1983-11-01), Baker et al.
patent: 4715453 (1987-12-01), Falgout, Sr. et al.
patent: 4770258 (1988-09-01), Falgout, Sr.

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