Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1995-08-08
1997-03-25
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367144, 181120, 25112907, 25112902, G01V 138, F16K 3102
Patent
active
056151705
ABSTRACT:
For marine seismic surveying using an array of airguns towed behind a survey ship, wherein a common high pressure hoseline supplies compressed air to a multitude of airguns, a method, system and apparatus selectively shut off air flow to any airgun for stopping leakage of compressed air from the common supply line. Shutoff valves are employed with a respective valve being upstream of each airgun to enable selectively shutting off compressed air flow from the common supply line to any airgun for stopping loss of compressed air from the common line caused by leakage from a leaking component downstream from any valve, such as a ruptured feeder hoseline to an airgun. Each shutoff valve has a spring whose spring force biases open its valve. Simultaneous electrical energization of windings in all shutoff valves electromagnetically overcomes the spring force for simultaneously closing all valves. The spring force is selected to be capable of overcoming valve friction for opening a closed valve when pressures can be equalized downstream and upstream of the closed valve because no leakage is occurring downstream of the closed valve and also is selected to be unable to open a closed valve when pressures downstream and upstream of the closed valve are unequalizable due to leakage occurring downstream of the closed valve. Thus, after the leakage has been selectively shut off, air pressure in the common supply hose rises to its normal working level, and seismic surveying can proceed with minimal delay.
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Bolt Technology Corporation
Eldred J. Woodrow
Parmelee G. Kendall
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