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3cr oil well pipe and its production method

A production method and oil well pipe technology, applied in the field of metallurgy, can solve the problems of unsatisfactory mechanical properties and high cost of 3Cr seamless steel pipes

Inactive Publication Date: 2011-12-07
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the whole, the mechanical properties of 3Cr seamless steel pipes involved in domestic and foreign literature are not very ideal, and the cost is relatively high.

Method used

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  • 3cr oil well pipe and its production method
  • 3cr oil well pipe and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the API 5CT standard P110 steel grade, the production specification is 139.7×9.17mm 3Cr seamless steel pipe. The steel material is 2Cr3Mo. The chemical composition is shown in Table 1. The balance is Fe and unavoidable impurities in terms of weight percentage.

[0029] Table 1-1 2Cr3Mo chemical composition

[0030] C

[0031] The rare earth element is 0.2%, among which europium: 0.08%, bismuth: 0.08%, cobalt: 0.04%.

[0032] Production process: selection of raw materials, smelting (including refining outside the furnace), continuous casting, continuous rolling, reheating, tension sizing and quenching and tempering heat treatment.

[0033] Reheating and tension sizing: hot rolling at 850°C, sizing by a micro-tension reducer, so that the change in the outer diameter of the billet is 30%, and a second sizing at 500°C after heat treatment, so that the change in the outer diameter is 5%, and warm straightening at 500°C.

[0034] Quenching and tempe...

Embodiment 2

[0044] According to the API 5CT standard P110 steel grade production specification is 224.5×7.92mm3Cr seamless steel pipe, the steel material is 2Cr3Mo, the chemical composition is shown in Table 1, by weight percentage, and the balance is Fe.

[0045] Table 2-1 2Cr3Mo chemical composition

[0046] C

[0047] The rare earth element is 0.1%, among which europium: 0.05%, bismuth: 0.01%, cobalt: 0.04%.

[0048] Production process: raw material selection, smelting, continuous casting, continuous rolling, reheating, tension sizing and quenching and tempering heat treatment. The quenching and tempering heat treatment adopts the quenching + high temperature tempering heat treatment process, the quenching temperature is 850 ℃ ~ 870 ℃, the quenching medium is water, the holding time is 40 minutes, the tempering temperature is 600 ~ 660 ℃, and the holding time is 100 minutes.

[0049] Take three groups of 3Cr oil well pipe samples and test the mechanical performance data, t...

Embodiment 3

[0056] According to the API 5CT standard P110 steel grade production specification is 224.5×7.92mm3Cr seamless steel pipe, the steel material is 2Cr3Mo, the chemical composition is shown in Table 1, by weight percentage, the balance is Fe and unavoidable impurities.

[0057] Table 2-1 2Cr3Mo chemical composition

[0058] C

Si

mn

S

P

Cr

V

Mo

Al

B

0.187

0.221

0.691

0.001

0.002

2.67

0.003

0.122

0.005

0.007

[0059] It also contains 0.005% of rare earth elements; of which europium: 0.002%, bismuth: 0.001%, cobalt: 0.002%.

[0060] Production process: raw material selection, smelting, continuous casting, continuous rolling, reheating, tension sizing and quenching and tempering heat treatment.

[0061] Reheating and tension sizing: hot rolling at 800°C, sizing by a micro-tension reducer, so that the change in the outer diameter of the billet is 10%, and a...

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Abstract

The invention discloses a 3Cr oil well pipe and a production method thereof, relates to a 3Cr oil well pipe for an acid oil-gas field and a manufacturing method thereof, and belongs to the technical field of metallurgy. The 3Cr oil well pipe comprises C, Si, Mn, S, P, Cr, Mo, V, Mo, Al, B, a rare-earth element and the balance of Fe and inevitable impurities. The production method for the 3Cr oil well pipe comprises the following steps of: selecting raw materials; smelting; continuously casting; continuously rolling; performing reheating and stretch sizing; and performing thermal refining. A treatment technology of removing stress by secondary sizing and hot straightening in the step of performing reheating and stretch sizing solves the technical problem that an S and CO2 resistant oil sleeve positioned in a hydrogen sulfide stress corrosion sensitive area has a low hydrogen sulfide stress corrosion resistant threshold value, is quickly corroded and is easily penetrated locally throughcorrosion.

Description

technical field [0001] A 3Cr oil well pipe and a production method thereof relate to a 3Cr oil well pipe for acid oil and gas fields and a manufacturing method thereof, and belong to the technical field of metallurgy. Background technique [0002] Contains H 2 S and CO 2 Acid-resistant and high-H resistance 2 S+ anti-CO 2 For corroded oil and casing, economical high H resistance 2 S+ anti-CO 2 Corrosion resistant tubing or casing. For example, in my country's Changqing, Sichuan, Tarim and other oil and gas fields, the natural gas contains different levels of H 2 S and CO 2 , the oil and casing used are required to be resistant to H 2 S has to resist CO 2 corrosion. H in most oil and gas wells due to field conditions 2 S and CO 2 The content and its partial pressure are not high enough to select expensive (more than 10 times) nickel-based alloy oil well pipes or nickel-chromium alloy oil well pipes, and economical anti-H 2 S+ anti-CO 2 3Cr oil well pipe, and un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D8/10C21D1/18C21C7/10C21C7/06B22D11/18E21B17/00
Inventor 李晶高连新张毅
Owner WUXI SEAMLESS OIL PIPE
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