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Method for manufacturing 105ksi steel grade sulfide stress corrosion resistant drill rod material

A 105ksi, stress corrosion technology, applied in the field of manufacturing 105ksi steel grade sulfide stress corrosion resistant drill pipe materials, can solve the problems of insufficient sulfide stress cracking resistance, unfavorable saving of precious metal resources, uneven structure of final products, etc. , to achieve good anti-SSC performance, simple and easy-to-operate process, and excellent resistance to sulfide stress cracking

Active Publication Date: 2013-06-05
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology

[0004] Some of the above-mentioned domestic patent documents and foreign sulfur-resistant drill pipe materials have high alloy content and high cost, which is not conducive to saving precious metal resources; Sulfide stress corrosion; there are still some tensile strengths that have reached the requirements of 105ksi steel grade drill pipes, but the resistance to sulfide stress cracking still cannot fully meet the requirements of 105ksi steel grade loaded 85%*S.M.Y.S drill pipe pipes

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  • Method for manufacturing 105ksi steel grade sulfide stress corrosion resistant drill rod material
  • Method for manufacturing 105ksi steel grade sulfide stress corrosion resistant drill rod material

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Embodiment Construction

[0015] The manufacturing method of the 105ksi steel grade sulfide stress corrosion resistant drill pipe material of the present invention will be described in conjunction with the examples.

[0016] The invention adopts Cr-Mo alloy elements to realize excellent hardenability and SSC resistance. Its composition (mass percentage) is C 0.20~0.30%, Si 0.15~0.35%, Mn 0.40~0.70%, P≤0.015%, S≤0.005%, Cr 0.70~1.50%, Mo 0.50~0.80%, Nb 0~ 0.05%, V 0~0.06%, Ni≤0.20%, Ca≥0.0015%, the rest is Fe and unavoidable impurities.

[0017] Detailed chemical composition:

[0018] C: 0.20~0.30%

[0019] C is an important constituent element of low-alloy steel, and an important element for forming a tempered sorbite structure with fine carbide particles uniformly distributed after heat treatment. The reduction of C content is beneficial to improve the anti-SSC performance. In order to ensure the necessary strength of the steel pipe, the lower limit of C element content is 0.20%. The preferred co...

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Abstract

The invention provides a method for manufacturing a 105ksi steel grade sulfide stress corrosion resistant drill rod material. The method comprises the following steps of: smelting waste steel, sponge iron and (or) blast furnace molten iron serving as raw materials through an arc furnace, forming slag and removing phosphorus, performing ladle external refining, deoxidation, desulfuration and inclusion removal, adjusting and controlling chemical components, performing vacuum degassing, performing modification treatment on a calcium silk feeding inclusion, and performing continuous casting to form round billets; feeding the round billets into an annular furnace, and performing high-temperature heating, perforation and precise controlled continuous casting to prepare seamless steel tubes; andperforming tube end upsetting, tempering, thermal treatment and thermal straightening on the seamless steel tubes, cooling to room temperature, and performing flaw detection, mechanical property testand sulfide stress cracking (SSC) test. The manufacturing method has the advantages of low alloy content, low production cost, simple process and easiness in operation; based on the metallurgical clean steel, trace alloy components are added, so that the full hardening performance of the steel is improved; and the thermally treated tempered martensite tissues in which fine carbide granules are uniformly distributed have good SSC resistance.

Description

technical field [0001] The invention relates to a manufacturing method of 105ksi steel grade sulfide stress corrosion resistant drill pipe material. Background technique [0002] Oil drilling tools are exposed to different degrees of H in drilling engineering. 2 Various corrosive media such as S have common corrosion problems, which become more and more serious as drilling develops in the direction of high drilling speed, ultra-deep wells, and high pressure. According to relevant data, after decades of development in foreign countries, the loss of drilling tools per 1m drilled is controlled at 1-1.5kg, and the loss of drilled tools per 1m drilled in China has exceeded 4kg in recent years. According to statistics, 75% to 80% of the drilling tools lost each year in my country's petroleum industry are caused by corrosion, and sulfide stress corrosion is one of the main forms of oil drilling tool failure. With the rapid increase in the number of drilling wells, formations in m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48
Inventor 李毅许文妍吕传涛赵兴亮郑飞
Owner TIANJIN STEEL PIPE MFG CO LTD
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