Patent ID: 8627707

Claim:
An apparatus for the rapid testing of shaped charges on a rock target, the apparatus comprising: a) an overburdening chamber having an open end for accepting a rock target; b) a retractable ejector located within the overburdening chamber at an end opposite to the open end, the ejector retracting to create a space for receiving of a rock target into the overburdening chamber; c) a casing plate and a cement plate configured to cover the open end of the overburdening chamber; and d) a charge stack mounted to the overburdening chamber and creating a pressure seal for the overburdening chamber, wherein said charge stack comprises a clearance ring simulating gun-to-casing clearance and a standoff ring simulating charge-to-gun clearance; whereby rapid removal of a rock target from the overburdening chamber is facilitated by the retractable ejector.