Patent ID: 8528669
Filing Date: 2013-09-10
Classification: E21B

Abstract:
1. An earth removal member for drilling a wellbore with casing or liner, comprising: a tubular body; a head fastened to or formed with an end of the body, having a face and a side, made from a high strength material, and having head ports formed through the face; a blade formed on the head, extending from the side and along the face, and made from the high strength material; cutters disposed along the blade; nozzle adapters, each nozzle adapter disposed in a respective head port and having an adapter port formed therethrough, each nozzle adapter longitudinally and rotationally coupled to the head, and each nozzle adapter made from a drillable material selected from a group consisting of copper, brass, bronze, aluminum, zinc, tin, alloys thereof, or a polymer; a nozzle disposed in each adapter port and fastened to the respective nozzle adapter, wherein: