Patent ID: 10221661

Abstract:
In servicing a wellbore having casing cemented therein, an assembly deploys on tubing (coiled tubing or jointed pipe) downhole. Fluid is circulated down the tubing to the assembly, and a perforating gun on the assembly passes the circulated fluid through it. A tool downhole on the assembly is then operated with the circulated fluid passed through the perforating gun. For example, the tool can include a fluid-operated motor and milling tool. To allow the fluid to flow through the gun, an outer housing supports the load between the tubing and operable tool and has an inner flow tube disposed therein. Charges for perforating are supported in the space between the housing and flow tube. Once cleanup or other service is done with the tool, a detonation is initiated for the perforating the casing with one or more charges of the perforating gun. The detonation can be initiated by a deployed device or ball shifting a sleeve to drive a pin into a detonator. Detonating cord can connect the detonation to the charges.