Patent ID: 8118098
Filing Date: 2012-02-21
Classification: E21B

Abstract:
1. A system for use in a wellbore, comprising: a perforating gun string having a large internal flow path; a packer mounted to the perforating gun string; and a valve system mounted to the perforating gun string to control flow between an interior and an exterior of the perforating gun string via at least one radial port extending through a wall of the perforating gun string, the valve system comprising a valve controlled by an activation device responsive to a pressure and time signal, the activation device having electronics to detect both pressure inputs and the timing of the pressure inputs for matching against a predetermined signature, the activation device responding by selectively controlling an activation port that may be opened to enable actuation of the valve by hydrostatic pressure in the wellbore, the valve system being located in a perforating gun string housing so the valve system remains outside of the large internal flow path when actuated between open and closed states, the activation device being mounted in a slot within an outer surface of the perforating gun string housing to maintain the large internal flow path.