Patent ID: 8286706
Filing Date: 2012-10-16
Classification: E21B

Abstract:
1. A perforating system comprising; a gun body; a gun tube in the gun body; shaped charges in the gun tube and having a case, a liner in the case, and high explosive between the liner and the case; an annulus between the gun tube and gun body pressurized to a pressure exceeding atmospheric pressure; a bladder within the gun body encapsulating the gun tube and having ends connected to a surface adjacent the gun tube and along an interface circumscribing an axis of the gun body; and a port formed through a sidewall of the gun body in fluid communication with a space in the annulus and between the bladder and an inner surface of the gun body, so that when fluid ambient to the gun body is at a pressure exceeding atmospheric pressure, the fluid flows through the port and into the space thereby minimizing pressure differential across the gun body.