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High-strength high-toughness petroleum drill pipe and production method thereof

An oil drill pipe and production method technology, applied in the field of metallurgy, can solve the problems of poor hardenability, difficulty in ensuring the hardenability of the thickened end, low impact toughness of the thickened end, etc., and achieve the effect of good toughness

Inactive Publication Date: 2014-05-14
SHANGHAI HILONG DRILL PIPE MATERIALS INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the steel used in petroleum drill pipes has high content of impurity elements such as sulfur and phosphorus, and contains flaky inclusions in the structure. When the yield strength is 150-165Ksi (1034-1138MPa), its longitudinal full-scale impact energy at room temperature is often only 50 ~75J or so, at the same time, the hardenability is poor, and it is difficult to ensure the hardenability of the thickened end (about 30mm) during the overall heat treatment of the pipe body, resulting in low impact toughness of the thickened end

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Sponge iron and scrap steel are used as raw materials for steelmaking, and melted into molten steel in an electric arc furnace. After refining outside the furnace and vacuum degassing, the steel for making oil drill pipes is obtained. The composition is: C 0.22%, Si 0.17%, Mn 0.45%, Cr 0.9%, Mo 0.9%, V 0.05%, Al 0.02%, Ni 0.05%, Ti 0.01%, B 0.001%, S 0.001%, P 0.001%, and the rest is Fe.

[0028] The molten steel containing the above components is decarburized and refined to make a steel billet. Hot-rolled into a seamless mandrel mill

[0029] Steel pipe, no lubricant is used between the rolling head and the billet during rolling, but the materials used in the rolling head are (mass percentage): C 0.30%, Si 0.30%, Mn 0.40%, Cr0.40%, Ni 1.00%, Nb 0.45%, Mo 1.20%, W 5.00%, Co 1.20%, and the rest is Fe. During hot rolling, the hot centering temperature is 1270°C, the hot piercing temperature is 1250°C, the hot rolling temperature is 1100°C, and the sizing and reducing te...

Embodiment 2

[0039] Sponge iron and scrap steel are used as raw materials for steelmaking, melted into molten steel in an electric arc furnace, and refined outside the furnace and vacuum degassed to obtain steel for making oil drill pipes. The composition is: C 0.35%, Si 0.30%, Mn 0.65%, Cr 1.5%, Mo 1.5%, V 0.15%, Al 0.04%, Ni 0.20%, Ti 0.06%, B 0.008%, S 0.005%, P 0.008%, and the rest is Fe.

[0040] The molten steel containing the above components is decarburized and refined to make a steel billet. Hot-rolled into seamless

[0041] Steel pipe, no lubricant is used between the rolling head and the billet during rolling, but the materials used in the rolling head are (mass percentage): C 0.30%, Si 0.30%, Mn 0.40%, Cr0.40%, Ni 1.00%, Nb 0.45%, Mo 1.20%, W 5.00%, Co 1.20%, and the rest is Fe. During hot rolling, the hot centering temperature is 1270°C, the hot piercing temperature is 1250°C, the hot rolling temperature is 1100°C, and the sizing and reducing temperature is 920°C. Finally, ...

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Abstract

The invention relates to a high-strength high-toughness petroleum drill pipe and a production method thereof. The steel composition of the petroleum drill pipe comprises the following components in percentage by mass: 0.22-0.35% of C, 0.17-0.30% of Si, 0.45-0.65% of Mn, 0.9-1.5% of Cr, 0.9-1.5% of Mo, 0.05-0.15% of V, 0.02-0.04% of Al, 0.05-0.20% of Ni, 0.01-0.06% of Ti, 0.001-0.008% of B, less than 0.005% of S, less than 0.008% of P and the balance of Fe. The manufacturing method of the petroleum drill pipe comprises the following steps: decarbonizing and refining the liquid steel containing the components to form steel billets and hot rolling into seamless steel tubes through a mandrel mill, wherein after being rolled into the seamless steel tubes, the steel tubes are needed to be subjected to the heat treatment processes of two-time quenching and high-temperature tempering so as to guarantee the strength and the toughness of the steel tubes. The petroleum drill pipe manufactured by adopting the method has a remarkable characteristic that a certain amount of austenite tough phases are dispersively distributed on a superfine lath martensite matrix so as to increase the strength and toughness of steel. The high-strength high-toughness drill pipe disclosed by the invention has the advantages that the yield strength can be up to 150-165KSI under the pressure of 1034-1138MPA and the room temperature longitudinal full-size impact toughness is greater than or equal to 100J.

Description

technical field [0001] The invention relates to an oil drill pipe for exploiting oil or natural gas, in particular to a high-strength, high-toughness oil drill pipe and a production method thereof, belonging to the technical field of metallurgy. Background technique [0002] Oil and natural gas are important energy sources for human beings. With the development of drilling technology and the gradual reduction of shallow easy-to-exploit oil and gas layers, the drilling depth is increasing. In recent years, a large number of 7000-8000m ultra-deep wells have been drilled in my country, and my country's offshore drilling is also gradually moving towards deep-sea development. As the depth of the well increases, materials are required to have higher yield strength and matching high toughness. Currently, the highest steel grade S-135 drill pipe that is commonly used in accordance with the regulations of the American Petroleum Institute (API) cannot meet its requirements. V-150 Ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21D8/00E21B17/00
Inventor 高连新袁鹏斌周勇其
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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