Perforating guns for use in the perforating of casing during oil and gas well completions, the systems comprising detonators and explosive shaped charges; Oil field equipment carrier assemblies comprised of explosive charges and detonators contained within prewired tubular subs in the nature of pipes, wherein the shaped charges are configured to be detonated within an oil and gas well in response to a signal; Perforating explosive equipment for use in recompletion perforating applications in unconventional oil and gas wells, namely, perforating guns specially adapted for use with explosive charges