Uprighting bearings for downhole drilling motors

A technology of righting bearings and bearings, which is applied in the direction of drilling drive devices, casings/covers/supports, electromechanical devices, etc. in boreholes, can solve the problems that the bearing capacity of righting bearings cannot meet the needs, and achieve axial space saving, The effect of increasing the life and increasing the diameter
CN111293816BActive Publication Date: 2021-04-27DONGFANG ELECTRIC MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGFANG ELECTRIC MACHINERY
Publication Date
2021-04-27

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Abstract

The invention discloses a centralizing bearing for a downhole drilling tool motor, and relates to the technical field of downhole motors. The present invention includes a bearing static ring and a bearing moving ring. The static ring of the righting bearing is provided with a plurality of static ring slots for the stator coil to pass through. The inner surface of the bearing static ring is a closed structure to form a friction surface of the static ring; the bearing The outer surface of the moving ring forms the friction surface of the moving ring of the bearing, and the diameters of the friction surface of the moving ring of the bearing and the friction surface of the static ring are the same as the outer diameter of the rotor iron core. In this application, several slots of the static ring are set in the axial direction of the static ring, and the stator coil can pass directly through the slots of the static ring. The radial space of the motor is used to the maximum, and the diameter of the friction surface is increased, so that the bearing capacity of the bearing is increased, thereby saving the entire The axial space of the motor reduces the length of the motor.
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Description

technical field

[0001] The present invention relates to the technical field of downhole motors, in particular to a sliding bearing device for motors with a high aspect ratio (motor length / motor rotor diameter) such as submersible motors or downhole drilling motors, and more specifically relates to a downhole Centralizing bearings for drill motors. Background technique

[0002] Downhole motors refer to motors that work underground for drilling or transporting fluids. Due to the limitation of the wellhead, this type of motor is generally a slender structure with an aspect ratio of more than 50 (motor length / motor rotor diameter). Some motors are less than 200mm in diameter, but their length even reaches more than ten meters. In order for the motor to operate safely and stably underground, an effective air gap must always be maintained between the outer diameter of the motor rotor and the inner diameter of the stator. If the air gap between the rotor and the stator cannot be ...

Claims

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