Abstract: Disclosed embodiments may describe a jacket. The jacket includes a back wall, top wall, bottom wall, and first and second sidewalls extending from the back wall and between the top and bottom walls. An internal cavity of the jacket is defined by the back wall, the top wall, the bottom wall, and the sidewalls. A slotted shaped charge housed in the internal cavity is retained by a retention latch that extends from an internal surface of at least one of the top wall, the bottom wall, the first and second sidewalls. The jacket may be positioned in a shaped charge receptacle formed in a shaped charge carrier. An orientation slot or tab may be formed into a peripheral edge portion of the receptacle, and a key may be configured for being received within the orientation slot.

Abstract: A dynamic underbalance sub for use in a wellbore may include a sub housing, a first chamber provided in an interior of the sub housing, an opening extending through the sub housing and configured such that the first chamber is in fluid communication with an exterior of the sub housing, a second chamber provided in the interior of the sub housing, and a pressure-isolating wall provided between the first chamber and the second chamber.