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Method for preparing drill collar steel

A drill collar and molten steel technology, applied in the field of drill collar steel and its preparation, can solve the problems of drill collar steel strength and plastic toughness mismatch, drill collar steel plastic toughness, increase steel production costs, etc.

Inactive Publication Date: 2013-04-10
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to overcome the problem of the mismatch between the strength and ductility of the drill collar steel existing in the prior art, and to provide a solution that can solve the problem of low plastic toughness of the drill collar steel without greatly increasing the production cost of the steel. Drill collar steel with high strength and ductility and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing drill collar steel, the method comprising:

[0033] (1) adopting the molten iron after desulfurization to carry out blowing;

[0034] (2) tapping molten steel after blowing into the ladle, and carrying out carburization and alloying in the process of tapping into the ladle;

[0035] (3) carrying out refining outside the furnace with the molten steel after alloying, the method of refining outside the furnace comprises argon blowing refining, LF refining and vacuum refining;

[0036] (4) Pouring the molten steel refined outside the furnace.

[0037] In order to control the content of impurities Ni, Cu and Sn in the drill collar steel provided by the present invention, the C content of the steelmaking raw material can be selected to be > 3.5% by weight, Ni content < 0.2% by weight, Cu content < 0.2% by weight, Hot metal or steel scrap with Sn content < 0.05% by weight is used as raw material. In addition, in ord...

Embodiment 1

[0050] This embodiment is used to illustrate the drill collar steel provided by the present invention and its preparation method.

[0051] The desulfurized molten steel is subjected to blowing. Based on the total weight of the molten steel, when the C content in the molten steel is 0.05% by weight, the P content is 0.009% by weight, and the S content is 0.008% by weight, the steel is immediately tapped into the ladle. When tapping, first add 3.2 kg of pitch coke (the C content is 76% by weight, Panzhihua Yangcheng Metallurgical Auxiliary Materials Co., Ltd.) for each ton of molten steel to increase carbon. Add 3.7 kilograms of pre-deoxidizer aluminum-iron alloy (Al content is 40% by weight, Anyang Hengwang Metallurgical Refractories Co., Ltd.) in the ladle, then add 6.0 kilograms of refining slag, Fe-Mn-Si (Si content of 18% by weight, Mn content of 68% by weight, Anyang Hengwang Metallurgical Refractory Co., Ltd.) 6.8 kg, Fe-Mn (Mn content of 81% by weight, Anyang Hengwang Me...

Embodiment 2

[0057] This embodiment is used to illustrate the drill collar steel provided by the present invention and its preparation method.

[0058] Melting iron-containing raw materials into molten steel, then desulfurizing, blowing the desulfurized molten steel, based on the total weight of molten steel, when the C content in the molten steel is 0.12% by weight, the P content is 0.008% by weight, and the S content is 0.009% by weight % when the steel is tapped into the ladle immediately. When tapping, first add 2.1 kilograms of pitch coke (the C content is 76% by weight, Panzhihua Yangcheng Metallurgical Auxiliary Materials Co., Ltd.) for each ton of molten steel to increase carbon. Add 2.8 kilograms of pre-deoxidizer aluminum-iron alloy (Al content is 40% by weight, Anyang Hengwang Metallurgical Refractories Co., Ltd.) in the ladle, then add 6.0 kilograms of refining slag, Fe-Mn-Si (Si content of 18% by weight, Mn content of 68% by weight, Anyang Hengwang Metallurgical Refractory Co...

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Abstract

The invention relates to drill collar steel and a preparation method thereof. The drill collar steel comprises the following components based on the total weight of drill collar steel: 0.41-0.47wt% of C, 0.15-0.3wt% of Si, 0.95-1.2wt% of Mn, 0.95-1.2wt% of Cr, 0.15-0.3wt% of Mo, 0.02-0.04wt% of Al, 0.01-0.03wt% of Ti, less than or equal to 0.02wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.2wt% of Ni, less than or equal to 0.2wt% of Cu, less than or equal to 0.05wt% of Sn, less than or equal to 0.0002 wt% of H, less than or equal to 0.007wt% of N and the balance of Fe;and T[O] is less than or equal to 0.0020wt%, and the A,B,C and D impurities are less than or equal to 1.5 levels. By using the preparation method, the problem that the strength of the drill collar steel is not matched with plastic toughness is solved.

Description

technical field [0001] The invention relates to a drill collar steel and a preparation method thereof. Background technique [0002] Drill collar is the main tool used in oil and natural gas drilling rigs, and is one of the most important parts of the drill string. It is connected under the square drill pipe and connected to the drill bit. It can provide drilling to the drill bit during the drilling process. It can increase the pressure of the drill string, increase the rigidity of the drill string, and at the same time play the role of pressurizing and preventing well deviation. The service environment of the drill collar is harsh, not only subject to tension, compression, bending, torsion and other stresses, but also subject to the friction of the well wall and the wear and corrosion of oil, gas, mud and other media. Therefore, the drill collar itself is required to have heavy weight, thick pipe wall, good rigidity and good comprehensive performance. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21C7/04C21C7/072C21C7/06
Inventor 代华云郭华刘建华张彦恒冷元平柯晓涛韩振宇雷秀华陈小龙
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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