Gas gun assembly

Details Gas gun assembly Gas gun assembly

1981-02-25

1983-10-11

Wilbur, Maynard R.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

166255, 181124, 181117, 367908, G01V 140

Patent

active

044086768

ABSTRACT:
A gas gun assembly for measuring depths of reflectors in a well bore includes a housing having a central chamber and bottom bulkhead through which a first valve bore extends. Coupling structure is provided to connect the housing to the well. A cap closure for the chamber has a second valve bore therethrough of diameter larger than the diameter of the first valve bore and is located in axial alignment with the first valve bore. A valve stem has one end axially movable within the second valve bore while closing the same and the other end movable into and out of the first valve bore. A predetermined pressure condition is established across the bulkhead. The valve stem is then released for rapid equalization of pressure across the bulkhead to produce an acoustic pulse in the well bore.

REFERENCES:
patent: 2047974 (1936-07-01), Lehr et al.
patent: 2156519 (1939-05-01), Walker
patent: 3316997 (1967-05-01), McCoy
patent: 3915256 (1975-10-01), McCoy
patent: 3958217 (1976-05-01), Spinnler
patent: 4134097 (1979-01-01), Cowles
patent: 4318298 (1982-03-01), Godbey et al.
patent: 4351037 (1982-09-01), Sherbatskoy

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