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155ksi steel grade high strength-toughness casing steel, casing pipe and preparation method of casing steel and casing pipe

A 1.155ksi, high-strength and toughness technology, used in casing and its preparation, 155ksi steel grade high-strength toughness casing steel field, can solve the problem of unstable toughness, and achieve the effect of good matching of strength and toughness and stable performance

Active Publication Date: 2015-07-22
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are only a few domestic enterprises that can produce V150 casing, but the toughness is not stable. There is no relevant report on the production of high-strength and toughness casing V155, and a large number of imports are still needed to meet the needs of oil exploration.

Method used

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  • 155ksi steel grade high strength-toughness casing steel, casing pipe and preparation method of casing steel and casing pipe
  • 155ksi steel grade high strength-toughness casing steel, casing pipe and preparation method of casing steel and casing pipe
  • 155ksi steel grade high strength-toughness casing steel, casing pipe and preparation method of casing steel and casing pipe

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preparation example Construction

[0034] The preparation method of above-mentioned 155ksi steel grade high-strength toughness casing steel comprises the following steps:

[0035] a. Steelmaking: use molten iron with low five harmful elements, pig iron and pipe heads as raw materials, and smelt them on an electric arc furnace to obtain primary molten steel;

[0036] b. LF refining and VD vacuum degassing treatment: LF refining is performed on the initial molten steel, and calcium treatment is carried out after refining; after calcium treatment, VD vacuum degassing treatment is carried out, and the degassing treatment is performed at a vacuum degree ≤ 67Pa for 15 minutes. Degassing treatment for at least 5 minutes under vacuum degree ≤ 200Pa, then calcium treatment, static blowing treatment after calcium treatment, static blowing time ≥ 15 minutes, tapping, tapping temperature 1570 ~ 1585 ℃;

[0037] c. Casting: cast the steel processed in step b into a continuous casting round billet.

[0038] In the above ste...

Embodiment 1

[0052] ①Steelmaking

[0053] Using molten iron, pig iron and pipe heads with low five harmful elements as raw materials, it is guaranteed that the endpoint As≤0.020%, Sn≤0.010%; and As+Sn+Pb+Sb+Bi≤0.025%.

[0054] Strengthen deoxidation during the tapping process, the amount of deoxidizer added: CaBaAlSi 1.5-2.5kg / t, Al block 2-3kg / t; add lime 2.5-4.5kg / t in the ladle before tapping.

[0055] LF refining and smelting molten steel, adjust the composition to include: C 0.23-0.27%, Si 0.20-0.35%, Mn 0.45-0.60%, Cr 0.95-1.10%, Mo 0.75-0.85%, Nb 0.03-0.05% by mass percentage , V 0.07~0.12%, Al0.015~0.045%, Cu≤0.20%, Ni≤0.20%, Ti≤0.04%, P≤0.010%, S≤0.003%, O≤0.0020%, N≤0.0080%; As ≤0.020%, Sn≤0.010%, and As+Sn+Pb+Sb+Bi≤0.025%, the rest is qualified molten steel for Fe, residual elements and impurities.

[0056] Ensure that the white slag time is ≥ 20 minutes, so that the inclusions in the steel can be fully floated; at the same time, the secondary calcium treatment process is adop...

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Abstract

The invention particularly discloses155ksi steel grade high strength-toughness casing steel, a casing pipe and a preparation method of the casing steel and the casing pipe. The 155ksi steel grade high strength-toughness casing steel comprises the following chemical components by weight percent: 0.23-0.27% of C, 0.20-0.35% of Si, 0.45-0.60% of Mn, 0.95-1.10% of Cr, 0.75-0.85% of Mo, 0.03-0.05% of Nb, 0.07-0.12% of V, 0.015-0.045% of Al, and the balance of Fe and residual element, impurity and five-harmful elements. The high strength casing pipe prepared according to the invention is mainly used for an ultra-deep oil-gas well and a complicated geological oil and gas field; according to the performance requirement of the related casing pipe, the reasonable microalloying component is selected, the stable performance of the high strength-toughness casing steel is guaranteed, the toughness is well matched and the requirements of the ultra-deep oil-gas well and the complicated geological oil and gas field at home and abroad are met.

Description

technical field [0001] The invention relates to a high-strength toughness casing steel, a casing and a preparation method thereof, in particular to a 155ksi steel grade high-strength and toughness casing steel, a casing and a preparation method thereof. Background technique [0002] With the increasing scarcity of oil resources and the increasing demand for oil and gas, in order to obtain more oil resources, the development of oil fields with complex geological conditions and difficult exploitation is intensified; as the depth of oil wells increases, the temperature and pressure in the wells increase accordingly. Significant changes have taken place in the geological environment in which the casing used for cementing and completion has changed, and higher requirements have been put forward for the comprehensive mechanical properties, serviceability and life of the casing. In order to ensure the safe operation of the oil well, the casing of V155 steel grade must be used. It m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C22C38/28C22C38/48C22C38/50C22C33/04C21D1/18C21D9/08
CPCY02P10/20
Inventor 陈坤曾理黄英蒋世川
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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