Abstract: Method and apparatus for adapting a Standard End Cap assembly of a perforating gun to function as a Tubing Conveyed Perforating end cap assembly of a perforating gun. The method includes inserting an inner end cap into an opening of a Standard End Cap, and positioning the inner end cap such that the inner end cap and Standard End Cap become interlocked without the need of a snap ring. The apparatus includes an inner end cap that may include anchors or receivers, and a Standard End Cap that may include anchors or receivers, such that the anchors in one component correspond to the receivers in the other component to facilitate the interlocking of the two components.

Abstract: An apparatus for more effectively extracting energy resources from underground reservoirs and a method for manufacturing the same. The apparatus is a perforating gun that includes scallops shaped such that charges that are displaced from their original location nevertheless remain located below the scallop, which increases the effectiveness of displaced charges when detonated. In addition, the scallops are created using a method that enables the entire scallop to be of a uniform thickness, which also increases the effectiveness of charges detonated beneath the scallop.