Coupling for a downhole tandem drilling motor

Details Coupling for a downhole tandem drilling motor Coupling for a downhole tandem drilling motor

1995-06-07

1997-04-15

Neuder, William P.

Boring or penetrating the earth

With below-ground tool drive prime mover

Plural below-ground drive prime movers

175107, E21B 300

Patent

active

056200560

ABSTRACT:
The tandem drilling motor includes an upper power section comprised of an upper rotor and stator and a lower power section comprised of a lower rotor and stator. A connector having a flowbore therethrough has one end attached to one end of the upper rotor and another end connected to an end of the lower rotor. The upper and lower rotors have a bore therethrough for the passage of drilling fluid. The flowbore of the connector communicates with the bores of the upper and lower rotor whereby drilling fluid may pass through the bore of the upper rotor, the flowbore of the connector, and the bore of the lower rotor. The drilling fluid exits the lower rotor through a port adjacent its lower end. The connector includes transition bores at each end to avoid turbulent flow through the connector.

REFERENCES:
patent: 3802803 (1974-04-01), Bogdanov et al.
patent: 3982858 (1976-09-01), Tschirky
patent: 4059165 (1977-11-01), Clark
patent: 4585401 (1986-04-01), Baldenko et al.
patent: 4679638 (1987-07-01), Eppink
patent: 4711006 (1987-12-01), Baldenko et al.
patent: 5090497 (1992-02-01), Beimgraben et al.

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