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G01V 1/38 (2006.01)
Patent
CA 1150390
735.063 GKP S P E C I F I C A T I O N METHOD AND APPARATUS FOR GENERATING SEISMIC IMPULSES USING HIGH PRESSURE WATER PUMP AS THE ENERGIZING SOURCE INVENTOR: STEPHEN V. CHELMINSKI ABSTRACT OF THE DISCLOSURE 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 pres- surized 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.
344649
Bolt Associates Inc.
Westell & Hanley
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