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US 4,134,097 AGranted
Combination geophone-hydrophone
AssigneeShell Oil Company
InventorChristopher S. Cowles
Life of this patent
Estimating the term…
Abstract
A method and apparatus for measuring and identifying up- and down-traveling waves wherein both a velocity-sensitive and pressure-sensitive transducer are disposed at a point below the earth's surface, as for example in a borehole that is refilled. The pressure transducer is designed to provide intimate contact with the formation surrounding the borehole, and in addition, is the electrical equivalent of the velocity transducer.
Claims7
A method for measuring and separating up- and down-traveling seismic waves comprising:
- lowering both a geophone and hydrophone to substantially the same depth in a borehole:
- packing the borehole with solid material at least to a level above the depth of the geophone and hydrophone;
- coupling the hydrophone to a circuit disposed adjacent the hydrophone, said circuit in combination with said hydrophone producing a hydrophone signal in response to pressure having the same phase and amplitude as the signal produced by the geophone in response to velocity;
- separately coupling said geophone and hydrophone to a recording system;
- and
- separately recording said geophone and hydrophone signals.
3 more elements
A combination geophone-hydrophone comprising:
- a tubular housing;
- a velocity-sensitive geophone, said geophone being fixedly mounted in said housing to respond to the velocity of said housing;
- a pressure-sensitive hydrophone, said hydrophone being mounted in said housing;
- a flexible diaphragm, said diaphragm forming a portion of the wall of said housing adjacent said hydrophone whereby said hydrophone may respond to the pressure to which the housing is exposed;
- and,
- circuit means, said circuit means being mounted in said housing and coupled to said hydrophone to convert said hydrophone to produce and electrical signal in response to pressure having the same phase and amplitude as the electrical signal produced by the geophone in response to velocity.
3 more elements
Dependencies are inferred from the claim text.