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Corrosion resistant and squeezing highly resistant oil casing pipe and preparation method thereof

A technology for oil casing and corrosion resistance, applied in the field of oil casing, can solve the problem that the oil casing can not meet the requirements of corrosion resistance and anti-collapse performance at the same time, and achieves the improvement of stress corrosion cracking resistance, corrosion resistance, corrosion resistance, etc. Conducive to the control of ovality and wall thickness unevenness

Active Publication Date: 2019-06-21
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing oil casing cannot meet the requirements of corrosion resistance and collapse resistance at the same time, the present invention provides a corrosion-resistant and high-collapse-resistant oil casing and a preparation method thereof

Method used

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  • Corrosion resistant and squeezing highly resistant oil casing pipe and preparation method thereof
  • Corrosion resistant and squeezing highly resistant oil casing pipe and preparation method thereof
  • Corrosion resistant and squeezing highly resistant oil casing pipe and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The embodiment of the present invention provides a corrosion-resistant and high-collapse-resistant petroleum casing:

[0047] Using scrap steel as raw material, through 80t electric arc furnace smelting→LF refining→VD vacuum refining→continuous casting→slab slow cooling to make continuous casting round billet, the weight percentage of its chemical composition is: C 0.22%, Si 0.35%, Mn 0.45 %, S 0.003%, P0.008%, Al 0.04%, Cr 0.75%, Mo 0.55%, Ca0.002%, N0.006%, and the rest are Fe and unavoidable impurities.

[0048] The obtained continuous casting round billet is heated in an annular furnace, pierced, rolled by a precision cross-rolling unit, reduced in micro tension, quenched and tempered, and straightened at a high temperature to make an outer diameter of 139.7mm and a wall thickness of 9.17mm; Casing with a yield strength of 95KSI.

[0049] In the heating process of the ring furnace, the temperature of the heating section is 1240°C, the temperature of the soaking sec...

Embodiment 2

[0058] The embodiment of the present invention provides a corrosion-resistant and high-collapse-resistant petroleum casing:

[0059] Using scrap steel as raw material, through 80t electric arc furnace smelting→LF refining→VD vacuum refining→continuous casting→slab slow cooling to make continuous casting round billet, the weight percentage of its chemical composition is: C 0.25%, Si 0.20%, Mn 0.40 %, S 0.002%, P0.01%, Al 0.03%, Cr 1.10%, Mo 0.55%, Ca0.0025%, N 0.08%, and the rest are Fe and unavoidable impurities.

[0060] The obtained continuous casting round billet is heated in an annular furnace, pierced, rolled by a precision cross-rolling unit, reduced in micro tension, quenched and tempered, and straightened at high temperature to make an outer diameter of 177.8mm and a wall thickness of 10.36mm; Casing with a yield strength of 110KSI.

[0061] In the heating process of the ring furnace, the temperature of the heating section is 1260°C, the temperature of the soaking sec...

Embodiment 3

[0070] The embodiment of the present invention provides a corrosion-resistant and high-collapse-resistant petroleum casing:

[0071] Using scrap steel as raw material, through 80t electric arc furnace smelting→LF refining→VD vacuum refining→continuous casting→slab slow cooling to make continuous casting round billet, the weight percentage of its chemical composition is: C 0.30%, Si 0.15%, Mn 0.60 %, S 0.001%, P0.006%, Cr 1.20%, Mo 0.25%, Ca 0.0018%, N 0.08%, and the rest are Fe and unavoidable impurities.

[0072] The obtained continuous casting round billet is heated in an annular furnace, pierced, rolled by a precision cross-rolling unit, reduced in micro tension, quenched + high temperature tempering heat treatment, and straightened at a high temperature, and made into an outer diameter of 219.1mm and a wall thickness of 12.7mm; casing with a nominal yield strength of 95KSI.

[0073] In the heating process of the ring furnace, the temperature of the heating section is 1280...

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Abstract

The invention discloses a corrosion resistant and squeezing highly resistant oil casing pipe and a preparation method thereof. The oil casing pipe comprises, by weight percentage, 0.22%<=C<=0.30%, 0.15%<=Si<=0.35%, 0.40%<=Mn<=0.60%, S<=0.003%, P<=0.01%, 0.02%<=Al<=0.04%, 0.75%<=Cr<=1.20%, 0.25%<=Mo<=0.55%, Ca<=0.0025%, N<=0.08% and the balanced Fe and unavoidable impurities. The oil casing has theadvantages that the squeezing resistant strength of the prepared oil casing pipe is 30% or above higher than the squeezing resistant strength required by API 5C3 standards, the hydrogen sulfide corrosion resistance performance is conformed to demands in API 5CT (45 edition) PSL3, and the oil casing pipe can be extensively applied to the exploitation of oil and gas wells of acid medium deep wells, ultra-deep wells and the like with complicated geological conditions

Description

technical field [0001] The invention relates to the technical field of petroleum casing, in particular to a corrosion-resistant and high-collapse-resistant petroleum casing and a preparation method thereof. Background technique [0002] With the development of the petroleum industry, the drilling depth of oil and gas wells is getting deeper and deeper, and most of the newly developed oil and gas resources are distributed in areas with harsh surface and underground environments, resulting in increasingly complex service conditions for oil well pipes. Casing downhole not only faces H 2 S, CO 2 Corrosion of such media, but also complex geological conditions or complex external force exerted by creeping formations on the pipe string, so the performance requirements for oil casing are getting higher and higher. Casings used under special geological conditions with acidic media should not only have high collapse resistance, but also have excellent resistance to hydrogen sulfide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/18C22C38/12C22C38/22C21D8/10C21D1/18
Inventor 王学敏
Owner DALIPAL PIPE
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