In-hole motor drill with bit clutch
AssigneeSmith International, Inc.
InventorKurt H. Trzeciak
Life of this patent
Estimating the term…
Abstract
An in-hole motor drill assembly has the rotor of the motor connected to the drill bit by a slidable rotary drive connection, and normally disengaged torque transmitting members are engageable, if desired, to lock the bit and motor housing together for rotation of the bit by rotation of the motor housing. The torque transmitting members also interlock to prevent disengagement when an upward pull is applied during rotation of the bit.
Claims21
An in-hole motor comprising:
- an elongated motor stator including a housing connectable at one end to a pipe string;
- a rotor in said stator;
- a drive shaft extending from the other end of said housing and connected with said rotor for rotation therewith relative to said housing;
- a drill bit connector to mount a drill bit on said drive shaft for rotation therewith relative to said housing;
- bearings between said shaft and said housing to transmit thrust from said housing to said shaft in opposite directions to load said bit axially against the bottom of a bore hole and to pull said bit off the bottom of the bore hole;
- normally disengaged clutch means engageable between said housing and said shaft for coupling said shaft and housing for rotation together.
An in-hole motor drill comprising:
- an elongated motor stator including a housing connectable at one end to a pipe string;
- a rotor in said stator;
- a drive shaft having an end extending from the other end of said housing and connected with said rotor for rotation therewith relative to said housing by the flow of drilling fluid through said housing;
- a bit sub on said end of said drive shaft;
- a rotary drive connection between said bit sub and said drive shaft end permitting longitudinal movement of said bit sub on said drive shaft end;
- clutch means on said bit sub and said housing engageable to transmit rotation from said housing to said bit upon longitudinal relative movement of said housing and said bit sub;
- and means for transmitting thrust from said drive shaft to said bit sub and operable to permit said longitudinal movement when the thrust load is in excess of a selected load.
An in-hole motor assembly adapted for connection with a rotatable pipe string and to drive a drill bit, said assembly comprising:
- a motor stator including a housing connectable at one end to a pipe string;
- a rotor in said stator;
- a drive shaft extending from the other end of said housing and connected to said rotor for rotation therewith relative to said housing;
- a bit connection on said drive shaft for rotation therewith;
- thrust transmitting means between said housing and said shaft for transmitting thrust in both axial directions, a clutch between said housing and shaft and engageable for connecting said housing and shaft for joint rotation.
Dependencies are inferred from the claim text.