Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1986-03-11
1988-05-31
Jordan, Charles T.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181113, 367 83, 367146, G01V 104, G01V 138
Patent
active
047474661
ABSTRACT:
An impact tool for linearly accelerating a mass such as in a jack hammer. The tool includes first and second members respectively mounted in sealing relationships in first and second outlets of a chamber. The chamber is initially pressurized with a first quantity of gas which remains constant during the normal operation of the tool. To begin a cycle, the first member is moved toward the second member to sealingly engage the end portions thereof and entrap a first volume of gas therebetween. The volume of the entrapped gas is then reduced by continuing to move the first member. This raises the pressure of the entrapped gas and opens a one-way check valve to place the entrapped gas in fluid communication with the gas in the surrounding chamber. Forward movement of the first member is then stopped which again seats the check valve wherein movement of the first member is reversed so that it moves away from the second member. This movement is continued until the pressure of the remaining entrapped gas between the two members is reduced sufficiently below the pressure in the surrounding chamber that the net force on the second member causes it to follow the first to a restored position. The tool is then fired by placing the remaining entrapped gas in fluid communication with the higher pressure gas in the surrounding chamber. Adaptations of the basic invention for use as a seismic energy source in an ambient liquid under high pressure such as in a wellbore are also disclosed.
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The Development and Evaluation of a New Marine Seismic Energy Source: The HP Water Gun, Bill L. Jaworski, May 8, 1975.
Carson W. Scott
Eldred John W.
Jordan Charles T.
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