Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1996-06-10
1998-11-10
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Well logging
181102, 181119, 367 86, 367 87, 367 99, 367908, G01V 140
Patent
active
058347100
ABSTRACT:
A gas gun is provided for generation of an acoustic pulse and subsequent detection of return reflections from the annulus of a well. The system includes a gas gun and a hand-held gas source. The hand-held gas source comprises: a two-part housing forming a chamber for receipt of a small CO.sub.2 gas cartridge commonly used for CO.sub.2 target pistols; means for piercing the gas cartridge and pressurizing the chamber; a coupling for releasable connection to a delivery assembly; a passageway leading from the chamber to the coupling; and a first valve in the passageway for controlling release of gas from the chamber. The gas gun comprises: a housing forming a chamber having inlet and outlet ports; a connection from the outlet port to the wellhead; a coupling on the inlet port for releasable and sealable connection to the gas source; a second valve for closing the inlet port; a pilot operated, pressure differential assisted solenoid valve on the outlet port for suddenly releasing pressurized gas from the chamber and into the wellhead; and a microphone communicating with the outlet port for receiving acoustic reflections. Preferably the housing of the gas gun permits the solenoid valve to be reversibly installable, enabling rapid release of gas either into or out of the wellhead.
REFERENCES:
patent: 3316997 (1967-05-01), McCoy
patent: 3915256 (1975-10-01), McCoy
patent: 4408676 (1983-10-01), McCoy
patent: 4637463 (1987-01-01), McCoy
patent: 4646871 (1987-03-01), Wolf
patent: 4934186 (1990-06-01), McCoy
patent: 5117399 (1992-05-01), McCoy et al.
patent: 5165383 (1992-11-01), Ebert et al.
Echometer Company--Ad. Brochure--about 1975-1980 (a) Model D; (b) Single Shot Gas Gun; (c) Implosion Gas Gun.
Instruction sheet from Crossman re "New Improved piercing System", date unknown, page No. unknown.
Eldred J. Woodrow
Otatco Inc.
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