Patent ID: 8971152
Filing Date: 2015-03-03
Classification: G01V

Abstract:
1. A low pressure air gun for seismic exploration which reduces high frequency sounds, comprising: a cylindrical housing; a bulkhead wall within the cylindrical housing to separate an operating chamber from an air cushion chamber; a central opening in the bulkhead wall; a shuttle assembly having a shaft inserted through the central opening in the bulkhead wall and having an operating flange on an end of the shaft within the operating chamber; a cup shaped firing piston secured to an opposing end of the shuttle assembly shaft separating the air cushion chamber from the firing chamber; a plurality of ports formed within the cylindrical housing, the width of the ports extending to a distance greater than the outer diameter of the cup shaped firing piston; a firing chamber secured to the cylindrical housing; and wherein the air gun operates at pressures in a range of 400 psi to 1000 psi.