Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1997-06-30
1999-06-15
Bagnell, David J.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
417903, E21B 402
Patent
active
059112840
ABSTRACT:
A downhole motor operated by circulating mud fluid in the wellbore is revealed. The motor has nested rotors and is geared to a bit drive. The motor is a dual-rotor pump that is operated as a motor with mud flow through the rotor housing on end connections. The structures of the rotor housing and the rotors can be made of the same material. An angular offset can be incorporated between the centerline of the output of the motor and the bit drive. In the preferred embodiment, the motor output is through a gear located within a bigger gear connected to the bit so as to provide a speed reducer. The drive between the rotors and the bit can accommodate angular offsets of a predetermined amount for directional drilling. The design is compact and can be used to drill wellbores as small as about 21/2" in diameter, or even smaller.
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Bagnell David J.
Pegasus Drilling Technologies L.L.C.
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