Patent ID: 9664013
Date: 2017-05-30
CPC Classifications: E21B

Claim:
1. A wellbore subassembly comprising: a tubular core defining a core axial bore in the interior of the core, and an exterior space outside the core, said core comprising a tubular wall with one or more cavities therein configured to hold one or more charge assemblies, and a first end and a second end wherein the first end and second end are configured to connect the core to a tubular drill string such that the core axial bore provides a substantially continuous fluid channel from a drill string connected to said first end, through the core and into a drill string connected to said second end, a first tubular sleeve forming an outer sleeve axial bore and positioned over the core to contain at least a portion of the core inside the outer sleeve axial bore, and one or more charge assemblies in the one or more cavities configured to discharge into the core axial bore and into the exterior space outside the core for creating a flowpath between the core axial bore and the exterior space outside the core.