Method and apparatus for sonically stimulating oil wells to incr

Details Method and apparatus for sonically stimulating oil wells to incr Method and apparatus for sonically stimulating oil wells to incr

1986-08-26

1987-10-27

Suchfield, George A.

Wells

Processes

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

166177, E21B 4325

Patent

active

047023155

ABSTRACT:
A screw type "moyno" sonic oscillator which employs an elongated screw shaped rotor rotatably mounted in a double pitched screw shaped stator is lowered down an oil well casing to a region thereof where effluent is being drawn into the well from a surrounding earthen formation. A pressurized stream of liquid such as water is fed down a pipe string connected to the oscillator assembly so as to rotatably drive the oscillator rotor at a frequency such as to generate sonic energy in a quadrature gyratory mode of oscillation. The pressurized liquid fed to the oscillator exits from the bottom end of the oscillator assembly and rapidly fills the space between the well casing and the oscillator thereby forming a hydrostatic head in this region. A good hydrostatic head is thus rapidly built up in the annulus between the well casing and the oscillator assuring good coupling of sonic energy to the liquid annulus. This liquid annulus is vibrationally driven in pressure waves against the formation to effectively increase its permeability and free any blockage therein, thus facilitating the flow of effluent into the well.

REFERENCES:
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patent: 3754598 (1973-08-01), Holloway, Jr.
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patent: 4271915 (1981-06-01), Bodine
patent: 4280557 (1981-07-01), Bodine
patent: 4469175 (1984-09-01), Massa

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