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A kind of anti-fatigue multi-layer structure steel oil pumping polished rod and its processing technology

A multi-layer structure, oil-sucking polished rod technology, applied in drill pipe, drill pipe, casing and other directions, can solve the problems of increasing processing cost and difficulty, difficulty in controlling production links, and restricting popularization and application, and achieves improved bending resistance. Performance and fatigue resistance, good comprehensive mechanical properties, excellent toughness and fatigue resistance

Active Publication Date: 2020-09-01
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are patents that use a new high-alloy steel material as the base material of the polished rod, and the fatigue performance has been significantly improved, but the cost is high, and the production process is difficult to control. More importantly, a large amount of high-alloy steel The use causes serious waste of materials, significantly increases the processing cost and difficulty, and limits its large-scale popularization and application.

Method used

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  • A kind of anti-fatigue multi-layer structure steel oil pumping polished rod and its processing technology
  • A kind of anti-fatigue multi-layer structure steel oil pumping polished rod and its processing technology

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Experimental program
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Effect test

Embodiment 1

[0027] see figure 1 with figure 2, according to the present invention provides a kind of anti-fatigue multi-layer structure steel oil pumping polished rod, its technical scheme is as follows: It includes upsetting end 3, rod body 1 and closed end 2, and the rod body 1 is placed on the upsetting end Between the head 3 and the closed end 2, the rod body 1 and the cross section of the upset end 3 are connected by a weld 4 welded by friction welding, and the rod body 1 and the closed end The cross-sections of the ends 2 are connected by a weld 5 welded by a friction welding process. The rod body 1 includes a solid steel core rod 11 and a tubular outer layer, and the tubular outer layer includes a first outer layer 12 and The second outer layer 13, the tubular outer layer is composed of arc-shaped steel bars, the tubular outer layer is composed of arc-shaped steel bars, the length of the arc-shaped steel bars is consistent with the solid steel core rod , the first outer layer 12...

Embodiment 2

[0035] According to a kind of anti-fatigue multi-layer structure steel oil sucking polished rod provided by the present invention, its technical solution is basically the same as that of Embodiment 1, the difference is as follows: the tubular outer layer includes a first outer layer, a second outer layer and a second outer layer Three outer layers, the tubular outer layer is composed of arc-shaped steel bars, the first outer layer, the second outer layer and the third outer layer each include five arc-shaped steel bars, and the solid steel core rod It is a medium-low carbon chromium-molybdenum alloy steel, with a yield strength of 670 MPa at 0.2% residual deformation, a tensile strength of 840 MPa, an elongation of 11%, and a reduction of area of ​​35%; the arc-shaped steel bar of the first outer layer It is tough steel with 0.2% residual deformation yield strength of 850 MPa, tensile strength of 960 MPa, elongation of 13%, reduction of area of ​​52%, and the total content of a...

Embodiment 3

[0037] According to a kind of anti-fatigue multi-layer structure steel oil pumping polished rod provided by the present invention, its technical solution is basically the same as that of Embodiment 1, the difference is as follows: the tubular outer layer includes a first outer layer, a second outer layer, a second outer layer, and a second outer layer. Three outer layers, the fourth outer layer and the fifth outer layer, the tubular outer layer is composed of arc-shaped steel bars, the first outer layer, the second outer layer, the third outer layer, the fourth outer layer and the first outer layer Each of the five outer layers includes seven arc-shaped steel bars. The solid steel core rod is a medium-low carbon chromium-molybdenum alloy steel with a yield strength of 650 MPa at 0.2% of residual deformation, a tensile strength of 830 MPa, and an elongation of 10%. The reduction of area is 32%; the arc-shaped steel bar of the first outer layer is strong and tough steel, the yiel...

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Abstract

An anti-fatigue multilayer steel smooth sucker rod comprises an upsetting end, a rod body and a closed end. The rod body is positioned between the upsetting end and the closed end and comprises a solid steel mandrel and a tubular outer layer, the tubular outer layer at least comprises a first outer layer and a second outer layer, and the tubular outer layer is formed by arc steel strips. A coatingconcept is introduced to the steel smooth sucker rod without a coating, and bending resistance and fatigue resistance of the smooth sucker rod are remarkably improved by the multilayer tubular shelland sheeted structure. By a progressive structure of mechanical performance indexes including strength, plasticity and the like, high adaptability to deformation characteristics of the smooth sucker rod under complicated alternating stress is realized, complicated stress conditions of the smooth sucker rod are well met, and oilfield application and popularization are benefited.

Description

technical field [0001] The invention relates to petroleum equipment, and more specifically relates to an oil pumping polished rod and a processing technology thereof. Background technique [0002] As one of the main oil production components in oil fields at home and abroad, fatigue failure is one of the main problems that have always plagued the oil pumping rod. In particular, because the polished rod bears a large bending cyclic load within ten centimeters below the clip, the alternating stress at this position is very complicated, and the radial bending alternating stress and the axial tensile alternating stress are superimposed. Together, resulting in fatigue failure is particularly significant. In order to solve the problem of wear and corrosion, the spray-welded coated polished rod has a higher hardness of the surface coating, and it is more difficult to coordinate the deformation with the polished rod substrate, resulting in further aggravation of fatigue fracture. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00B23P15/00
Inventor 田斌杜秋月安思佳
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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