| 摘要 |
EARTH REMOVAL MEMBER WITH FEATURES FOR FACILITATING DRILL-THROUGH An earth removal member (1) for drilling a wellbore with casing or liner, comprising: a tubular body (5); a head (10) fastened to or formed with an end of the body (5), having a face (10f) and a side (10g), made from a high strength material, and having head ports (10p) formed through the face (10f); a blade (15a) formed on the head (10), extending from the side (10g) and along the face (10f), and made from the high strength material; cutters (20) disposed along the blade (15a); nozzle adapters (450), each nozzle adapter (450) disposed in a respective head port (10p) and having an adapter port (450p) formed therethrough, each nozzle adapter (450) longitudinally and rotationally coupled to the head (10), and each nozzle adapter (450) made from a drillable material selected from a group consisting of copper, brass, bronze, aluminium, zinc, tin, alloys thereof, or a polymer; a nozzle (100) disposed in each adapter port (450p) and fastened to the respective nozzle adapter (450), wherein: a nominal thickness of the face (10f) facilitates drill-through by a drill bit, each nozzle adapter (450) has a thickness greater than the nominal thickness, and a length of each nozzle (100) is greater than the nozzle adapter (450) thickness. |
