Patent ID: 7591212

Claim:
A method of perforating a cased wellbore, the method comprising: inserting perforating guns having shaped charges into a wellbore, the perforating guns connected by a coupling, the coupling comprising: a first section having an end threadingly engaged with a first perforating gun and an opposite end having a taper with male threads formed thereon, a second section, having an end with an opening, the opening having a taper corresponding to the first section tapered end, threads on the second section opening threadingly engaged with the first section tapered end, an opposite end threadingly engaged to a second perforating gun; and a cavity between the first and second sections and a vent extending between the cavity and the coupling outer surface, so that when the perforating gun is detonated, pressure within the coupling is equalized to the ambient pressure outside the coupling: perforating a portion of the wellbore by detonating the shaped charges.