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

Active Publication Date: 2021-04-27
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present application proposes a centralizing bearing for a downhole drilling tool motor. The purpose of the invention of the present application is to solve the problem that the carrying capacity of the centralizing bearing cannot meet the demand in the prior art due to the limitation of the diameter of the motor. The problem

Method used

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  • Uprighting bearings for downhole drilling motors
  • Uprighting bearings for downhole drilling motors
  • Uprighting bearings for downhole drilling motors

Examples

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Embodiment 1

[0026] As a preferred embodiment of the application, refer to the attached figure 1 , 2 , 3 and 4, the present embodiment discloses:

[0027] The righting bearing for the downhole drilling tool motor includes a bearing static ring and a bearing moving ring. The inner surface of the bearing static ring is a closed structure, forming the friction surface of the static ring; the outer surface of the bearing moving ring forms the friction surface of the bearing moving ring, and the friction surface of the moving ring of the bearing and the friction surface of the static ring The diameter is the same as the outer diameter of the rotor core; the outer surface of the static ring of the centralizing bearing is provided with a positioning groove for the static ring, and the positioning groove of the static ring is matched with the positioning key of the static ring to realize the static ring of the bearing and the stator casing The circumferential positioning between them; the bearin...

Embodiment 2

[0029] As another preferred embodiment of the present application, refer to the attached Figure 1-5 , this example discloses:

[0030] Such as figure 1 As shown, the righting bearing for the motor of the downhole drilling tool includes a static bearing ring and a moving bearing ring. The static ring slot for the stator coil to pass through, the inner surface of the bearing static ring is a closed structure, forming a static ring friction surface; the outer surface of the bearing dynamic ring forms the bearing dynamic ring friction surface, and the bearing dynamic ring friction surface and the static ring The diameter of the friction surface is the same as the outer diameter of the rotor core; the outer surface of the static ring of the centralizing bearing is provided with a positioning groove for the static ring, and the positioning groove of the static ring is matched with the positioning key of the static ring to realize the static ring of the bearing and the Circumferen...

Embodiment 3

[0032] As another preferred embodiment of the present application, refer to the attached Figure 1-5 , this example discloses:

[0033] The motor straightening bearing disclosed in the present application is a sliding bearing device used for motors with a high aspect ratio (motor length / motor rotor diameter) such as submersible motors or downhole drilling motors. It is mainly composed of two parts: fixed part and rotating part.

[0034] The fixed part includes: the static bearing ring 4, the left positioning ring 2, the right positioning ring 5 and other parts. Among them, the bearing static ring 4 is made of a whole piece of non-magnetic or weak magnetic conductive material, and there are several static ring notches 14 on it, and the stator coil 7 can pass through the static ring notches 14 directly, and the inner surface is a closed structure , forming the static ring friction surface 19; the static ring of the bearing is provided with a positioning groove 13, and the circum...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K5/167E21B41/00E21B4/04
CPCE21B4/04E21B41/0085H02K5/167
Inventor 林坤李少斌孙立宾兰勇韩锐伍俊肖柏洋赵志城陈艳伟赵杰
Owner DONGFANG ELECTRIC MACHINERY
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