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Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof

A sucker rod steel, ultra-high-strength technology, applied in the field of alloy structural steel, can solve the problems of poor comprehensive performance and fatigue life, unsatisfactory sucker rod fatigue life, affecting oil production efficiency, etc., so as to eliminate the need for surface induction The quenching process, the effect of improving strength and overall properties, reducing the probability of occurrence

Active Publication Date: 2011-02-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of using non-quenched and tempered steel to make sucker rods is that no heat treatment is required, but non-quenched and tempered steel has insufficient toughness, poor overall performance and fatigue life
CN1065887A and CN1366090 are both non-quenched and tempered steels. Due to the shortcomings of non-quenched and tempered steels, the lack of toughness will lead to unsatisfactory fatigue life of sucker rods and affect oil production efficiency.
The performance of CN1366090 invention steel only reaches the D-grade sucker rod standard, which limits the application in more complex environments

Method used

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  • Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof
  • Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof
  • Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof

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Embodiment

[0035] An HL grade sucker rod steel, the commercial designation is 27CrMoAHL. UHP overpower electric furnace, LF out-of-furnace refining, VD vacuum degassing treatment process are used for smelting, continuous casting casting slab, and rolling lumber process to produce steel. The embodiment specifically illustrates how the present invention is implemented with the production process of Φ22mm steel.

[0036] The production process is as follows:

[0037] (1) Smelting: use electric furnace smelting, the end point [C]0.10~0.15%, [P]≤0.015%, the residual element content meets the design requirements, the tapping temperature of molten steel is 1630-1640℃; LF refining outside the furnace, refining slag alkali Degree 3.5, white slag retention time 20 minutes; vacuum treatment after refining, vacuum degree less than 67Pa, retention time 15 minutes, soft argon blowing time after VD 12 minutes. The determination of process hydrogen is carried out with a hydrogen meter, and the hydroge...

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Abstract

The invention relates to a multi-element alloyed ultrahigh-strength sucker rod steel and a manufacturing method thereof. The sucker rod steel comprises the following components in percentage by weight: 0.25 to 0.29 percent of C, 0.17 to 0.37 percent of Si, 0.50 to 0.70 percent of Mn, 0.95 to 1.20 percent of Cr, 0.18 to 0.25 percent of Mo, 0.005 to 0.025 percent of P, 0.001 to 0.025 percent of S, 0.015 to 0.050 percent of Al, 0.015 to 0.050 percent of Ti, less than or equal to 20ppm of [O], less than or equal to 3ppm of [H], and the balance of Fe and inevitable impurities. The steel has excellent comprehensive performance and long fatigue life, and is suitable for oil recovery operation of heavy and overload oil wells.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a multi-element alloyed ultra-high-strength sucker rod steel and its manufacturing technology. Background technique [0002] Mechanical oil recovery is the main means of oilfield development, and the rod pumping system plays an important role in mechanical oil recovery. The sucker rod is an important part of rod pumping equipment. Its function is to transmit the power of the surface pumping unit to the downhole pump and extract oil through the oil well pipe. [0003] The existing sucker rod steel at home and abroad can be divided into four grades of C, K, D and H according to the performance grade from low to high. Ultra-high-strength sucker rods are suitable for heavy oil wells, high water-cut wells, deep wells or ultra-deep wells. With the gradual deepening of oil wells, the strength and toughness of sucker rods are also continuously improved, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00C22C33/04C22C38/28
Inventor 翟正龙王广连戈文英王立君李修峰张利平赵德钢时振明李业才李广真梁娜亓显玲
Owner SHANDONG IRON & STEEL CO LTD
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