Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1978-11-13
1980-11-18
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181111, 181113, G01V 1137, G01V 138
Patent
active
042340527
ABSTRACT:
A powerful seismic impulse is generated in a body of water by a slug of water propelled from a seismic source by expanding pressurized gas, but the gas is retained in the source for use in subsequent firings. The seismic energy source, which is called a "hydro gun", is recharged by pumping an incompressible liquid, preferably, water, at high pressure into the gun to compress the retained pressurized gas. The hydro gun includes a firing cylinder, and a piston follower in the firing cylinder divides it into a liquid-charge chamber and a gas-propulsion chamber. The liquid-charge chamber is closed from liquid discharge ports by a shuttle which is held closed by the high pressure of gas in an operating chamber. By pumping an incompressible liquid into the liquid-charge chamber, the follower is forced to compress the pressurized gas which is trapped in the gas-propulsion chamber. Then, to trigger the source, the gas pressure in the operating chamber acting on a front surface of an operating piston of the shuttle is suddenly applied to the reverse surface of the operating piston. With the shuttle thus released, the compressed pressurized gas in the gas-propulsion chamber expands against the follower to propel the liquid in the liquid-charge chamber through the liquid discharge ports into the surrounding body of water for generating a powerful seismic impulse in the water.
REFERENCES:
patent: 3249177 (1966-05-01), Chelminski
patent: 3379273 (1968-04-01), Chelminski
patent: 3653460 (1972-04-01), Chelminski
patent: 3808822 (1974-05-01), Chelminski
patent: 3979140 (1976-09-01), Silverman et al.
patent: 4131178 (1978-12-01), Bouyoucos
"Water Gun Fills Marine Seismic Gap", Newman, Oil and Gas Journal, Aug. 7, 1978, pp. 138-150.
"Simplon Water Gun, A New Implosion Type Seismic Source", Renard et al., Offshore Technology Conf., Paper OTC 2017, 1974.
Birmiel Howard A.
Bolt Associates, Inc.
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