Thrust generator for boring tools

Patent · Tue Mar 13 00:00:00 EST 1984

OSTI ID:6487945

Dismukes, N B

The present invention provides an electrically powered system for advancing a rotary boring tool in situations where the inclination of the bore hole is such that the force of gravity does not provide sufficient forward thrust. One or more marine screw propellers are rotated by the motor which itself is restrained from rotation by being fixedly connected to a flexible, twist resistant conduit for conducting the drilling fluid and electric power from the surface. The system may also provide for different rotative speeds for propeller and bit and for counter-rotating propellers to minimize torque forces on the conduit.

• Assignee: EDB-84-169370
• Patent Number(s): US 4436168
• OSTI ID: 6487945
• Resource Relation: Patent File Date: Filed date 12 Jan 1982; Other Information: PAT-APPL-339001
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ROTARY DRILLS
DESIGN
ELECTRIC MOTORS
BOREHOLES
DRILL BITS
DRILLING FLUIDS
ELECTRIC GENERATORS
GRAVITATION
INCLINATION
TORQUE
VELOCITY
CAVITIES
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FLUIDS
MOTORS
422000* - Engineering- Mining & Underground Engineering- (1980-)