Oil well tube resisting stress corrosion of H2S and manufacture method thereof

A stress corrosion and hydrogen sulfide resistance technology, which is applied in the manufacture of tools, drill pipes, casings, etc., can solve the problems of insufficient alloy content and the inability to produce hydrogen sulfide stress corrosion resistant oil casings, etc.

Active Publication Date: 2007-03-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The above composition design, due to insufficient alloy content, cannot produce hydrogen sulfide stress corrosion resistant oil casing with steel grade above 110ksi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] Below just commonly used Cr-Mo steel, Cr-Mo-V steel, Cr-Mo-B steel and Cr-Mo-Nb-V steel of the present invention are compared, and its chemical composition is shown in Table 2, mechanical property and anti-sulfur performance See Table 3.

[0051] Table 2

[0052] steel type

[0053]

[0054] Note: The anti-SSC test is according to the method A of the NACE TM 0177 standard, using a Φ6.4 sample to pass saturated H2S into the A solution, and performing a 720-hour corrosion test under a load of 110ksi×80%.

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PUM

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Abstract

The invention discloses a hydrogen sulfide resistance stress corrosion oil sleeve, which comprises the following parts: 0.20-0.32% C, 0.1-0.5% Si, 0.4-1.0% Mn, 0.1-0.8% Cr, 0.5-1.2% Mo, 0.01-1.10% V, 0.01-0.10% Nb, not more than 0.015% P, not more than 0.010% S and Fe and inevitable impurity. The preparing method comprises the following steps: proceeding arc electric melting and external fine melting; deairing in the vacuum; proceeding calcium disposal; casting to form round mould; rolling to form seamless steel pipe; tempering to do heat disposal; quenching between 820 and 1000 deg.c; insulating for over 30min; quenching inner and outer steel pipe simultaneously; setting flashback temperature over 650 deg.c; insulating for over 60min; proceeding air cooling; making heat aligning temperature over 480 deg.c; preparing oil pipe or sleeve through fault finding and pipe manufacturing.

Description

technical field [0001] The invention relates to an anti-hydrogen sulfide stress corrosion oil well pipe and its manufacturing method, in particular to the manufacture of oil pipes and casings for oil development with a yield strength of over 110 ksi. Background technique [0002] The main process of the traditional production of oil casing and oil pipes for hydrogen sulfide stress corrosion resistance is: select the appropriate steel type, smelt, cast and roll into hot-rolled seamless steel pipes, then perform overall quenching and tempering heat treatment, and finally undergo appropriate mechanical processing It is made of oil casing and oil pipe for anti-hydrogen sulfide stress corrosion. [0003] Compared with general-purpose petroleum casing and tubing, oil casing and tubing for hydrogen sulfide stress corrosion resistance have many special features in material selection and production process. Its main feature is strict control of chemical composition and heat treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C22C33/04C21D9/08C21D11/00E21B17/00
Inventor 殷光虹张忠铧郭金宝孙元宁
Owner BAOSHAN IRON & STEEL CO LTD
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