Marine seismic source employing the water-hammer effect
Abstract
Abstract D R A W I N G APPARATUS FOR GENERATING A SEISMIC SIGNAL IN A FLUID MEDIUM WHEREIN A MEMBER SUCH AS A FLEXIBLE DIAPHRAGM, INFLATABLE ELASTIC MEMBER, PISTON, ETC., IS PLACED IN A FIRST OR INITIAL POSITION RELATIVELY SLOWLY BY A PNEUMATIC, HYDRAULIC, ELECTRICAL, MECHANICAL ETC., SYSTEM, AND UPON FIRING IS ALLOWED TO MOVE RAPIDLY TO A SECOND POSITION, WHERE IT IS ABRUPTLY STOPPED. THAT IS, THE MEMBER PROVIDES FOR THE SLOW CREATION OF A SELECTED VOLUME WITHIN THE FLUID MEDIUM WHICH VOLUME IS THEN ALLOWED TO SHRINK RAPIDLY WHEREUPON ITS MOTION IS SUDDENLY ARRESTED. THE HYDROSTATIC PRESSURE OF THE FLUID MEDIUM CAUSES THE MEDIUM TO FOLLOW THE MOVEMENT OF THE MEMBER, WHEREBY ABRUPTLY STOPPING THE MEMBER LIKEWISE SUDDENLY STOPS THE FLUID MOVEMENT TO GENERATE, IN TURN, A SINGLE HIGH PRESSURE PULSE DUE TO THE WATER-HAMMER EFFECT. THUS, THE INVENTION IS CONCERNED WITH GENERATING A SINGLE SEISMIC PULSE BY THE MORE EFFICIENT PROCESS OF SUDDENLY STOPPING, RATHER THAN BY SUDDENLY ACCELERATING, A GIVEN QUANTITY OF THE SURROUNDING FLUID MEDIUM.
Inventors
- 👤 Smith L Mott
Bibliographic Details
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