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Oil casing capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof

A stress corrosion cracking, hydrogen sulfide resistance technology, applied in the field of oil casing, can solve the problem of strong, can not meet the user's requirements for product upgrades, etc., to shorten the tempering time, improve the resistance to hydrogen sulfide stress corrosion, and shorten the heat treatment. effect of time

Inactive Publication Date: 2012-10-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Such as Chinese patents CN00136666.1, CN200510029218.0, CN200580019466.5, etc., all adopt steel grades with one or more alloying elements such as Cr, Mo, V, Ni, Cu, Nb and heat treatment to produce hydrogen sulfide stress resistance Corroded oil and casing, but with the soaring price of alloy elements in recent years, the demand for low-cost hydrogen sulfide stress corrosion resistant oil and casing is becoming stronger and stronger. At present, the existing oil and casing can no longer meet the user's requirements for product upgrades

Method used

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  • Oil casing capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof
  • Oil casing capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof
  • Oil casing capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0037] The chemical composition of Example 1 is shown in Table 2. The molten steel is smelted in an electric furnace, continuously cast, heated to 1250°C, and then pierced and rolled. The final rolling temperature is 900°C. The hot-rolled pipe is heat-treated for the whole pipe. The austenitization temperature is 950°C. The fire temperature is 710°C, and the holding time is 60 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 3.

Embodiment 2

[0039] The chemical composition of Example 2 is shown in Table 2. The molten steel is smelted in an electric furnace, continuously cast, heated to 1250°C, and then pierced and rolled. The final rolling temperature is 930°C. The hot-rolled pipe is heat-treated for the whole pipe. The austenitization temperature is 900°C. The fire temperature is 730°C, and the holding time is 40 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 3.

Embodiment 3

[0041] The chemical composition of embodiment 3 is shown in table 2. The molten steel is smelted in an electric furnace, continuously cast, heated to 1250°C, and then pierced and rolled. The final rolling temperature is 950°C. The hot-rolled pipe is heat-treated for the whole pipe. The austenitization temperature is 920°C. The fire temperature is 720°C, and the holding time is 40 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 3.

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Abstract

An oil casing capable of resisting hydrogen sulfide stress corrosion cracking and a manufacturing method thereof. The oil casing comprises components of, by weight percentage, 0.2-0.3% of C, 0.1-0.5% of Si, 0.3-0.6% of Mn, no more than 0.012% of P, no more than 0.002% of S, 0.01-0.05% of Ti, 0.01-0.08% of Al, 0.0005-0.005% of Ca, 0.001-0.003% of B, and the balance of Fe and unavoidable impurities. The manufacture method comprises steps of: 1) smelting and casting: smelting and casting the above components into a tube billet; 2) rolling: rolling the tube into a steel tube; and 3) heat treatment: heating at 900-950 DEG C, and insulating for 30-60min; and carrying out water quenching and tempering at 710-730 DEG C, and insulating for 40-60min. The oil casing of the invention has low cost and good resistance to sulfide stress corrosion cracking, and can meet requirement of sulfide stress corrosion cracking resistance in gas field exploration and development.

Description

technical field [0001] The invention relates to an oil casing, in particular to an oil casing resistant to hydrogen sulfide stress corrosion cracking and a manufacturing method thereof, which is used in a hydrogen sulfide environment and has good resistance to hydrogen sulfide stress corrosion. Background technique [0002] The environment used for oil casings for oil development contains many corrosive media such as hydrogen sulfide, which can not only uniformly corrode the surface of the pipe body, but also react with steel to generate hydrogen, which enters the interior of the steel matrix, causing stress corrosion cracking of the casing. Failure in a very short period of time, which brings great economic losses and safety hazards to oil field production, every year due to CO 2 and H 2 Accidents caused by S corrosion have brought economic losses of more than 100 million yuan to oil fields. [0003] The production process of seamless oil casing pipes resistant to hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D9/08C21D1/18
Inventor 董晓明高展
Owner BAOSHAN IRON & STEEL CO LTD
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