Perforating gun assembly and method of use in hydraulic fracturing applications

摘要

A method and apparatus for perforating a cased or lined wellbore, the apparatus comprising a perforating gun assembly 10 comprising a first gun module 20 on a first longitudinal portion of the assembly and a second gun module 30 on a second longitudinal portion of the assembly. The first gun module comprises at least one large hole shaped charge, and the second gun module comprises at least two deep penetrating shaped charges. The method comprises locating the perforating gun assembly in a cased wellbore with the first gun module at a perforation location and detonating the large hole shaped charges of the first gun module. The assembly is translated in the wellbore to locate the second gun module at the perforation location such that the position of the deep penetrating shaped charges corresponds to the position of the holes. The deep penetrating shaped charges of the second gun module are detonated to generate jets which pass through the one or more large holes and form at least two deep penetration holes in the formation adjacent the perforation location. The least two deep penetration holes intersect to provide a connected channel in the formation.