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A screw motor and downhole power drilling tool

A screw motor and bushing technology, which is applied in the driving device for drilling in the borehole, earthwork drilling, drilling equipment, etc., can solve the problem of uneven stress on the stator bushing, early failure of the stator bushing, and glue loss of the stator bushing and other problems, to achieve the effect of avoiding heat accumulation effect, good heat dissipation effect, and avoiding bushing delamination

Active Publication Date: 2021-04-30
SHANGHAI BRANCH CHINA OILFIELD SERVICES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One object of the invention is to provide a screw motor to solve the problem that the stator bushing is easily peeled off and peeled off due to uneven stress on the stator bushing during the rotation of the rotor of the medium-thickness screw motor in the prior art
[0007] Another object of the invention is to provide a downhole power drilling tool to solve the problem that the stator bushing of the medium-thickness screw motor in the prior art is prone to early failure

Method used

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  • A screw motor and downhole power drilling tool
  • A screw motor and downhole power drilling tool
  • A screw motor and downhole power drilling tool

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Embodiment Construction

[0027] The technical solutions of the invention are further described below with reference to the accompanying drawings and through specific embodiments.

[0028] like image 3 As shown, the present embodiment provides a screw motor, which includes a stator tube 1, a stator bushing 2 and a rotor 3, the stator bushing 2 is penetrated in the stator tube 1 and the outer peripheral surface of the stator bushing 2 and the stator tube are The inner peripheral surfaces of the 1 are fitted together, and the rotor 3 is inserted into the stator bushing 2 . In this embodiment, the stator bushing 2 is an elastic body. When the rotor 3 rotates, the stator bushing 2 is squeezed by the rotor 3, and the stator bushing 2 is in a reciprocating process of compression-rebound-compression.

[0029] In this embodiment, the stator tube 1 is made of steel, its outer peripheral surface is a cylindrical surface, and its inner peripheral surface is annular and corrugated. The outer peripheral surface o...

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Abstract

The invention discloses a screw motor and a downhole power drilling tool. The screw motor includes a stator bushing made of elastic material that is passed through a stator tube, a rotor that is passed through the stator bush, and an inner peripheral surface of the stator tube. 1. The outer peripheral surface of the stator bushing and the inner peripheral surface of the stator bushing are both ring-shaped and corrugated. The upper trough is opposite to the trough on its inner peripheral surface and constitutes a trough portion. Along the rotation direction of the rotor, the trough portion and its adjacent ridge portion are connected by a bearing portion, and the ridge portion and its adjacent trough portion are connected by a sealing portion. The thickness of the part and the trough part are both smaller than the thickness of the load-bearing part and greater than the thickness of the sealing part. Compared with the screw motor with equal wall thickness, the force on the stator bushing tends to be uniform during the rotation of the rotor, which can avoid excessive local stress amplitude and damage The resulting lining delamination, peeling, falling off and so on.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a screw motor and a downhole power drilling tool. Background technique [0002] The screw drilling tool is the most widely used downhole power drilling tool at present. It is mainly composed of a motor, a cardan shaft assembly and a drive shaft assembly. The motor includes a rotor, a stator bushing and a stator tube. The stator bushing is usually It is rubber with a certain elasticity of Shore hardness of 70-85, plastic or composite material with a Shore hardness of more than 90, and is bonded to the inner wall of the stator tube by injection molding and bonding. The inner contour of the bushing and the outer contour of the rotor mesh with each other, and the rotor has a certain pre-compression on the stator bushing to form several spiral sealing cavities with different positions. After the drilling fluid is introduced, under the action of a certain pressure difference, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03C2/08E21B4/02
CPCE21B4/02F03C2/08
Inventor 罗勇刘强邵增元褚道余张海山邱康刘轶溟黄召姜韡施览玲
Owner SHANGHAI BRANCH CHINA OILFIELD SERVICES
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