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A kind of oil and casing resistant to hydrogen sulfide stress corrosion cracking and its manufacturing method

A technology of stress corrosion cracking and hydrogen sulfide resistance, which is applied in the field of oil casing and its manufacturing, can solve the problems of stress corrosion cracking, economic loss and safety hazards, and achieve the effect of fine grain, good high strength and uniform composition

Active Publication Date: 2020-05-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 the oil field

Method used

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  • A kind of oil and casing resistant to hydrogen sulfide stress corrosion cracking and its manufacturing method
  • A kind of oil and casing resistant to hydrogen sulfide stress corrosion cracking and its manufacturing method
  • A kind of oil and casing resistant to hydrogen sulfide stress corrosion cracking and its manufacturing method

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Effect test

Embodiment 1-5 and comparative example 1-4

[0043] The oil casing pipe of embodiment 1-5 and the pipe steel of comparative example 1-4 adopt following steps to make:

[0044] (1) Smelting and casting by using the mass percentage ratio in Table 1 to obtain a tube blank, wherein the degree of superheat is controlled to be ≤30°C, and the casting speed is 1.6-2m / min;

[0045] (2) Rolling: the tube billet is soaked at 1210-1240°C, and then pierced. The piercing temperature is 1190-1240°C; the final rolling temperature is controlled at 900-950°C, and the sizing temperature is 850-900°C;

[0046] (3) Controlled cooling: water-cool the outer walls of the casings of Examples 1-5 and Comparative Examples 1-3, and cool them to 100-400°C at a cooling rate of 30-50°C / s, so that the structure of the steel pipes becomes shellfish. Tensite or martensite; (wherein, comparative example 4 adopts air cooling to 50 ℃, and cooling rate is 1.5 ℃ / s);

[0047] (4) Heat treatment: Quenching first: heat the steel pipe to 880-920°C, keep it warm ...

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Abstract

The invention discloses an oil sleeve resistant to hydrogen sulfide stress corrosion cracking. The microstructure of the oil sleeve is tempered sorbite, and chemical elements of the oil sleeve comprise, by mass, 0.18-0.28% of C, 0.1-0.5% of Si, 0.3-0.6% of Mn, 0.5-1% of Cr, 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 Fe and other inevitable impurities; the carbon equivalent Ceq of the oil sleeve is less than or equal to 0.5, wherein the Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15+Si / 24. Correspondingly, the invention further discloses a manufacturing method of the oil sleeve resistant to the hydrogen sulfide stress corrosion cracking. The oil sleeve is high in strength and good in hydrogen sulfide stress corrosion cracking resistance.

Description

technical field [0001] The invention relates to an oil casing and a manufacturing method thereof, in particular to an oil casing with high corrosion resistance and a manufacturing method thereof. 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] In the current existing technology, the production process of seamless tubing and casing resistant to hydrogen sulfide corrosion is: steel smelting, casting into tube blank...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/14C22C38/06C22C38/32C22C33/04B21C37/06
CPCB21C37/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14C22C38/18C22C38/32
Inventor 董晓明张忠铧孙文
Owner BAOSHAN IRON & STEEL CO LTD
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