Patent ID: 8807213

Claim:
A perforation gun, comprising: a tool body having an interior chamber, the tool body defining at least one shouldered hole wherein the shouldered hole comprises a hole through a wall of the tool body and a shoulder that is thinner than the wall of the tool body, wherein shouldered hole comprises a cross-sectional area through the wall of the tool body; at least one perforating explosive charge disposed within the tool body, wherein the perforating explosive charge has an axis of symmetry, the shouldered hole has an axis of symmetry, and the perforating explosive charge is aligned so the axis of symmetry of the perforating explosive charge substantially coincides with the axis of symmetry of the shouldered hole, wherein the at least one perforating explosive charge is configured to generate a focused explosive energy having a perforation area upon detonation, and wherein the cross-sectional area of the shouldered hole is greater than the perforation area of the at least one perforating explosive charge; and a plug disposed in the shoulder hole, wherein the plug is configured to unblock the hole through the wall of the tool body to provide a venting area greater than the perforation area in response to a pressure wave created by detonation of the explosive charge in the tool body and communicated from the interior chamber of the tool body through the hole.