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Anti-dropping transmission shaft assembly for positive displacement motor

A technology of screw drilling tools and drive shafts, which is used in the drilling driving device, drilling equipment, earth-moving drilling and other directions in the wellbore

Inactive Publication Date: 2014-03-05
SHANDONG LUHAI GASOLINEEUM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide an anti-drop drive shaft assembly for screw drilling tools to solve the problem of the drive shaft falling into the well without the anti-drop structure in the prior art question

Method used

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  • Anti-dropping transmission shaft assembly for positive displacement motor

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Embodiment Construction

[0011] As shown in the figure, an anti-dropping drive shaft assembly for screw drilling tools is mainly composed of upper radial bearing inner sleeve 3, upper radial bearing outer sleeve 4, thrust bearing 5, upper bearing shell 8, lower bearing shell 9, and The radial bearing inner sleeve 11 and the transmission shaft 14 are composed. The upper radial bearing inner sleeve 3 and the upper radial bearing outer sleeve 4 are arranged at the front end of the transmission shaft 14, the thrust bearing 5 is arranged in the middle of the transmission shaft 14, and the upper bearing shell 8 is arranged in the thrust On the surface of the bearing 5, the lower radial bearing inner sleeve 11 is arranged at the rear of the transmission shaft 14, the lower bearing shell 9 is located outside the lower radial bearing inner sleeve 11 and connected to the upper bearing shell 8, between the thrust bearing 5 and the lower bearing shell 9 Set the thrust ring 6, set an upper anti-drop nut 2 in front o...

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Abstract

The invention discloses an anti-dropping transmission shaft assembly for a positive displacement motor, and relates to the technical field of well drilling tools. The anti-dropping transmission shaft assembly is characterized in that an upper anti-dropping nut is arranged at the front of an upper radial inner bearing sleeve, an adjusting pad is connected to the front of the upper anti-dropping nut, and the outer diameter of the upper anti-dropping nut is larger than the inner diameter of an upper radial outer bearing sleeve; a lower anti-dropping nut is arranged between a thrust bearing and a lower radial inner bearing sleeve, and the outer diameter of the lower anti-dropping nut is larger than the inner diameter of a lower bearing shell; an anti-falling inner sleeve is fixed to a large end of a joint of a transmission shaft and a drill bit, and the lower anti-dropping nut is connected with the anti-falling inner sleeve in a threaded manner. The anti-dropping transmission shaft assembly has the advantages that the upper anti-dropping nut, the lower anti-dropping nut and the anti-falling inner sleeve are respectively arranged at the smallest-diameter position of the front end of the transmission shaft, the middle reducing position of the transmission shaft and the position at the large end of the joint of the transmission shaft and the drill bit, so that the problem that an existing transmission shaft falls into a well due to breakage of a stress concentration position of the existing transmission shaft can be effectively solved, and the anti-dropping transmission shaft assembly is simple in structure and smart in design and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to an anti-drop drive shaft assembly for a screw drilling tool. Background technique [0002] Screw drilling tools, also known as fixed-displacement motors, are volumetric downhole power drilling tools. In oil and gas drilling, screw drilling tools are mainly used for drilling special process wells, and can also be used to drill vertical wells. The screw drilling tool is mainly composed of a bypass valve assembly, an anti-drop assembly, a motor assembly, a cardan shaft assembly and a transmission shaft assembly. The transmission shaft assembly is located at the lower end of the screw drilling tool, and its function is to transfer the Rotational power is transmitted to the drill bit. Due to the large torque of the transmission shaft during the drilling process, and because the diameter of the transmission shaft changes, there are more or less fractures at the place where the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/00
Inventor 刘忠怀罗伯特·德维恩·马德森王春秀冯婷婷赵志刚肖曙光
Owner SHANDONG LUHAI GASOLINEEUM EQUIP
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