Downhole mud motor
AssigneePegasus Drilling Technologies L.L.C.
InventorGunther von Gynz-Rekowski
Life of this patent
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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.
Claims18
A well-drilling assembly using a bit shaft driven by a downhole motor, comprising:
- an elongated housing;
- at least two engaged rotors rotatably mounted in said housing;
- at least one of said rotors being operably connected to a bit shaft through a transmission supported in said housing which reduces the bit shaft speed with respect to the rotor speed;
- said support for said transmission in said housing insulates said transmission from loads from said housing as torque is transferred therethrough to said bit shaft;
- and
- said housing in fluid communication with said bit shaft through said transmission so that a motive medium passing through said housing causes said rotors to turn said transmission and bit shaft as the motive medium passes through said housing and moves through said transmission to said bit shaft.
Dependencies are inferred from the claim text.