Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing

A technology of oil casing and ultra-high toughness, which is applied in the direction of casing, manufacturing tools, drilling pipes, etc., to achieve the effect of easy production and implementation and simple heat treatment process

Active Publication Date: 2015-10-28
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lateral impact toughness of the casing is only 80J

Method used

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  • Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing
  • Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing
  • Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5 and comparative example 1-3

[0055] According to the following steps, the oil casing pipes in the examples 1-5 of the present invention and the oil casing pipes in the comparative examples 1-3 (the element ratio in each embodiment and the comparative examples are shown in Table 1, each embodiment and the comparative examples Concrete process parameter in the as shown in table 2):

[0056] (1) Smelting: The molten steel is smelted in an electric furnace, refined outside the furnace, vacuum degassed and stirred with argon, and then treated with Ca to denature the inclusions to reduce the O and H content;

[0057] (2) Casting tube blank: control the superheat of molten steel below 30°C during the casting process;

[0058] (3) Piercing and continuous rolling of steel pipes: After the continuous casting slab is cooled, it is heated in an annular heating furnace and soaked at 1200-1240°C, the piercing temperature is 1180-1240°C, and the final rolling temperature is 900°C-950°C;

[0059] (4) Heat treatment: con...

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Abstract

The invention discloses steel for a super-high-strength and super-high-toughness petroleum casing. The microstructure of the steel is a tempered sorbite. The chemical elements of the steel comprise, by mass, 0.1-0.22% of C, 0.1-0.4% of Si, 0.5-1.5% of Mn, 1-1.5% of Cr, 1-1.5% of Mo, 0.01-0.04% of Nb, 0.2-0.3% of V, 0.01-0.05% of Al, 0.0005-0.005% of Ca, the balance Fe and inevitable impurities. Correspondingly, the invention further discloses the petroleum casing made from the steel for the super-high-strength and super-high-toughness petroleum casing. Besides, the invention discloses a manufacturing method of the petroleum casing. The strength of the steel for the super-high-strength and super-high-toughness petroleum casing and the strength of the petroleum casing can be more than 155 ksi, the impacting toughness of the steel for the super-high-strength and super-high-toughness petroleum casing and the petroleum casing is 10% larger than the yield strength value of the steel for the super-high-strength and super-high-toughness petroleum casing and the petroleum casing, and super-high strength and super-high toughness match can be achieved.

Description

technical field [0001] The invention relates to a steel material and a manufacturing method thereof, in particular to an oil casing and a manufacturing method thereof. Background technique [0002] Deep wells and ultra-deep wells are more and more well conditions in the field of petroleum exploration and development in recent years. In order to ensure the safety of high-temperature and high-pressure mining and development, higher requirements for the strength of pipe string materials are required. However, generally speaking, as the strength of the steel increases, the toughness will decrease, and the insufficient toughness of the steel pipe after thinning can easily cause early cracks and fractures. Therefore, high-strength casing steel must be matched with high toughness to ensure the safety of the pipe string . [0003] According to the guidance standard of the British Department of Energy, the impact toughness of the pressure vessel should reach 10% of its yield strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C21D8/10
CPCC21D6/002C21D6/005C21D6/008C21D8/105C21D9/14C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18C22C38/22C22C38/24C22C38/26C22C38/28E21B17/00
Inventor 董晓明张忠铧金晓东
Owner BAOSHAN IRON & STEEL CO LTD
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