Patent ID: 9371719
Filing Date: 2016-06-21
CPC Classification: E21B

Claim Text:
1. A method for controlling pressure in a wellbore during a perforating operation, comprising: positioning a perforating tool within the wellbore, wherein the perforating tool comprises a gun, an energetic chamber, and a passage disposed within a barrier positioned between the energetic chamber and the gun; igniting an energetic within the energetic chamber to generate a controlled amount of propellant; igniting at least one charge within the gun, wherein the at least one charge is ignited toward a wall of the wellbore adjacent to the gun, wherein the at least one charge, when ignited, creates at least one perforation tunnel in the wellbore; and directing the controlled amount of propellant through the passage in the barrier from the energetic chamber into the gun, wherein the controlled amount of propellant is based on conditions in the wellbore, wherein the controlled amount of propellant controls a pressure within the gun after the at least one charge is ignited, wherein the pressure controlled by the controlled amount of propellant controls dynamic forces within the wellbore inside the gun to allow for withdrawal of material from the at least one perforation tunnel while preventing the at least one perforation tunnel from collapsing.