Method and apparatus for improving oil production in oil wells

Details Method and apparatus for improving oil production in oil wells Method and apparatus for improving oil production in oil wells

1985-10-16

1987-06-23

Novosad, Stephen J.

Wells

Processes

Vibrating the earth or material in or being placed in the...

166177, E21B 4325

Patent

active

046745718

ABSTRACT:
Method and apparatus for improving oil production in oil wells. The lower end of an elastic steel column is attached to the upper end of a liner. The upper end of the column extends above the top of the well and is attached to a reaction mass lying vertically thereabove through (1) an accelerometer and (2) vertically mounted compression springs in parallel with a vertically mounted servo-controlled hydraulic cylinder-piston assembly. A substantially constant upward load is applied to the reaction mass, and the piston of the hydraulic assembly is reciprocated under servo control to apply vertical vibration to the upper end of the column. This vertical vibration is adjusted through the servo control to an appropriate resonant frequency for the column in the range of 5 Hz to 25 Hz, and the frequency is maintained at resonance by a feedback system relying on maintaining a phase difference of 90.degree. between a displacement signal developed from the accelerometer and a pressure-differential signal related to the pressure difference between the opposite sides of the piston.

REFERENCES:
patent: 2700422 (1955-01-01), Bodine, Jr.
patent: 3004389 (1961-10-01), Muller
patent: 3189536 (1965-06-01), Bodine, Jr.
patent: 3262507 (1966-07-01), Hansen
patent: 4342364 (1982-08-01), Bodine
patent: 4512402 (1985-04-01), Kompanek et al.

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