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Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof

A technology of oil casing and manufacturing method, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of restricting high-strength and tough oil casing, and achieve the effects of reasonable cost, improved mechanical performance, and reasonable selection

Active Publication Date: 2008-08-27
TIANJIN PIPE GROUP CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

These problems restrict the development of oil casing with high strength and toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0097] The petroleum casing V150 (by 244.48×15.11mm) was produced according to the above composition and method, and its chemical composition and manufacturing process parameters are as follows:

[0098] The weight components of oil casing are: C: 0.23%, Si: 0.27%, Mn: 0.50%, Cr: 1.00%, Mo: 0.73%, Al: 0.030%, Ni: 0.05%, Cu: 0.070%, V: 0.080%, Ca: 0.0016%, P: 0.008%, S: 0.001%, and the rest is iron.

[0099] Sponge iron and scrap steel are used as raw materials for steelmaking, melted into molten steel in an electric arc furnace, refined outside the furnace and vacuum degassed to obtain the above chemical composition, and continuously cast into a round billet; the cooled continuous casting billet is cast in a ring Heating in the heating furnace, the furnace temperature is 1310°C, the heat centering is 1250°C, the hot piercing is 1225°C, the continuous rolling temperature is 1080°C, the sizing is 900°C, cooling, sawing; heat treatment: quenching at 920°C (water Quenching), temp...

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Abstract

The invention provides a steel grade of a bergol cannula with high intensity and high toughness, wherein the propositions of composition elements are that C 0.22-0.4%, Si 0.17-0.35%, Mn 0.45-0.60%, Cr 0.95-1.10%, Mo 0.70-0.80%, Al 0.015-0.040%, Ni<0.20%, Cu<0.20%, V 0.070-0.100%, Ca>0.0015%, P<0.010%, S<0.003% and the allowance is iron. The invention also provides a method for rolling the bergol cannula, which comprises the following steps: firstly, smelting batching, secondly, continuously casting and rolling, thirdly, processing a pipe. The method has the advantages of embodying steel grade with higher alloy content is adopted through the method, excellent mechanical property and lower production cost, the making of perforation and rolling techniques are reasonable, mechanical property of cannual is maximally improved, the selection of heat treatment process technique and thermal straightening temperature are reasonable, grain fineness numbers of tissues are refined, residual tension stress of the cannula is greatly lowered, geometric precision control range is strictly planned, and the property of the cannula is improved under the circumstance of reasonable production cost.

Description

technical field [0001] The invention belongs to the manufacturing technology of seamless steel pipes in the metallurgical industry, in particular to a high-strength and high-toughness oil casing and a manufacturing method thereof. Background technique [0002] With the rise of oil prices and the development of exploration technology, the depth of oil layers exploited is gradually increasing from shallow to deep, the pressure and temperature in oil and gas wells are also increasing, and the geological environment is becoming more and more severe. The stress state it bears is more complex and severe. Such drilling and production conditions have very strict requirements on the strength and toughness of the oil casing. Once the oil casing is improperly selected, there will be accidents such as crushing and leakage, which will lead to production reduction or even scrapping of the entire well. At the same time, at the current level of production technology, it is inevitable for s...

Claims

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Application Information

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IPC IPC(8): C22C38/48B21B1/46C21D9/08
Inventor 严泽生张传友王青峰李连进付继成刘江成宗卫兵周家祥王振祥陈建伟贺爽城
Owner TIANJIN PIPE GROUP CORP
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