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Drive shaft assembly for a downhole motor

A technology of drive shafts and components, applied in the field of universal joints, can solve problems such as difficult thrust loads, and achieve the effect of increasing torque load capacity and axial thrust load capacity

Inactive Publication Date: 2011-05-18
DRECO ENERGY SERVICES ULC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known U-joint designs are not easily adapted to withstand the higher thrust loads associated with newer high-dynamic, high-torque PD power sections, as the size of the spherical thrust bearing is limited by the allowable propshaft U-joint diameter

Method used

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  • Drive shaft assembly for a downhole motor
  • Drive shaft assembly for a downhole motor
  • Drive shaft assembly for a downhole motor

Examples

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Effect test

Embodiment Construction

[0076] refer to figure 1 A drive shaft assembly 10 according to the present invention includes a drive shaft 20 having an upper end 22 and a lower end 24 , an upper end housing 30 and a lower end housing 40 . When assembled into a downhole motor, the drive shaft assembly 10 will be enclosed by a figure 1 In the tubular propshaft housing conceptually shown by dashed line 15 , an annular space 16 is formed between the propshaft housing 15 and the propeller shaft assembly 10 .

[0077] The upper housing 30 has a connector portion 32 adapted to be connected to an output shaft (not shown) of a power section of a downhole motor and a coaxially adjacent socket portion 34 adapted to To receive the upper end 22 of the propeller shaft 20 and accommodate the omnidirectional rotation of the propeller shaft 20 therein, while transmitting rotational torque and axial thrust loads from the output shaft to the propeller shaft 20 . The lower end housing 40 has a connector portion 42 adapted t...

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Abstract

A drive shaft assembly for a downhole motor includes a drive shaft formed with convexly spherical bearing surfaces on each end, and end housings with concavely spherical bearing surfaces for mating contact with the spherical bearing surfaces of the drive shaft, thereby facilitating omni-directional articulation between the drive shaft and the end housings while transferring axial thrust loads between the drive shaft and end housings across the interface of the mating spherical bearing surfaces. Torque is transferred between the drive shaft and end housings through two or alternatively four swivelling drive keys mounted to each end of the drive shaft and engageable with complementary drive key slots in the end housings. Full and constant torque-transferring contact is thus provided between the swivelling drive keys and the end housings irrespective of any angular offset between the drive shaft and the end housings, resulting from omni-directional articulation of the drive shaft relative to the end housing. The omni- directional center of rotation at each end of the drive shaft coincides with the geometric centerpoint of the corresponding convexly spherical bearing surface, which corresponds to the intersection of the drive shaft's rotational axis, the end housing's rotational axis, and the drive key swivel axis.

Description

technical field [0001] The present invention generally relates to universal joints for transmitting torque between rotating shafts having intersecting non-coinciding axes of rotation. More particularly, the present invention relates to drive shafts for use in connection with downhole motors used to drill wellbores in the oil and gas industry, particularly in applications requiring the transmission of large torque and axial thrust loads across subs universal joints. Background technique [0002] In drilling a wellbore (or wellbore) into the subsurface, for example to obtain hydrocarbons or minerals from a subterranean formation, it is common practice to connect the drill bit to an assembly of drill pipe sections connected end-to-end (often referred to as the "drill string"). ”), and then rotate the drill string so that the drill bit is advanced down into the soil to create the borehole. In addition to the drill pipe section, drill strings for non-horizontal drilling operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D3/20F16C1/04E21B7/08E21B17/03E21B4/00
CPCE21B4/02F16D3/20F16C11/0623F16C3/02F16D3/2052F16D3/2057Y10T29/49826
Inventor 乔纳森·瑞安·普里尔马克·路易斯·菲利普·福格尔
Owner DRECO ENERGY SERVICES ULC
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