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Preparation method of high-chromium dual-phase steel expansion pipe

An expansion pipe and dual-phase steel technology, which is applied in the field of preparation of high-chromium dual-phase steel expansion pipes, can solve the problems of only small improvement, poor corrosion resistance, large expansion pressure, etc., to prevent surface scaling and material accumulation. , the effect of increasing surface hardness and smoothness, reducing and stabilizing expansion force

Active Publication Date: 2020-04-17
东营普洛孚能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional low-carbon steel expansion tube is not suitable for natural gas reservoirs with high acid gas content due to its poor corrosion resistance.
High-chromium pipes, such as 2205 dual-phase steel and 2507 dual-phase steel, although the overall ductility is high, the yield strength of the material is also high (>580 MPa), and at the same time, the surface hardness of the dual-phase steel material is small (HB < 200), even after solution treatment, its hardness can only be slightly improved (HB < 250)
Therefore, during the re-expansion process of high-chromium dual-phase steel, the expansion pressure is very high (140*7 2205 dual-phase steel, when the expansion rate is 12%, the expansion force can reach up to 40MPa); at the same time, due to the high surface hardness of high-chromium dual-phase steel Small, it is easy to form metal accumulation during the expansion process, which will cause abnormal increase in expansion pressure or even accidents such as cone jamming, increasing construction risks

Method used

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  • Preparation method of high-chromium dual-phase steel expansion pipe
  • Preparation method of high-chromium dual-phase steel expansion pipe

Examples

Experimental program
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Embodiment 1

[0023] A method for preparing a high-chromium dual-phase steel expansion tube, comprising the steps of:

[0024] (1) High-temperature quenching treatment of high-chromium duplex stainless steel expansion tubes: place the high-chromium duplex stainless steel expansion tubes in an electromagnetic induction heating furnace, heat them to above 1250°C and cool them, and reduce the yield strength of the high-chromium duplex stainless steel expansion tubes from the original Adjust the base metal above 580MPa to 400-480MPa;

[0025] (2) Inner surface hardening treatment of high chromium duplex stainless steel expansion tube: the high chromium duplex stainless steel expansion tube after high temperature quenching treatment is coated with lubricating grease after preliminary cleaning. The thickness of the coated grease is 0.05mm. The chromium duplex stainless steel expansion tube is surface hardened to increase its surface hardness from HB 300, and at the same time improve the smoothnes...

experiment example 1

[0032] Using the 2205 dual-phase steel sample prepared by the preparation method of a high-chromium dual-phase steel expansion tube in Example 1 and the untreated 2205 dual-phase steel sample for performance test comparison, the test results are compared as shown in Table 1 :

[0033] Table 1

[0034] Test items Untreated 2205 duplex steel sample 2205 dual-phase steel sample processed in embodiment 1 Remark Yield Strength >580 MPa ~450 MPa none Surface hardness < HB 200

[0035] It can be clearly seen from Table 1 that the pressure of the high-chromium dual-phase steel expansion tube treated by this process is about 30% lower than that of the untreated material during the expansion process, and the expansion pressure remains unchanged with the increase of the expansion length , which makes the installation and construction of high-chromium duplex stainless steel expansion tubes with large length and large expansion rate possible, which greatly...

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Abstract

The invention relates to the technical field of preparation of high-chromium dual-phase steel expansion pipes, in particular to a preparation method of a high-chromium dual-phase steel expansion pipe.Electromagnetic induction normalizing is adopted for the high-chromium dual-phase steel expansion pipe, a mechanism designed by the method is used for grinding the inner wall of the pipe and coatingthe surface of the inner wall of the pipe with a solid lubricating film, on the premise of properly reducing the yield strength of the material, the surface hardness and the smoothness of the finishedproduct pipe are increased, the phenomena of surface scaling and material accumulation in the expansion process of the dual-phase stainless steel pipe are prevented, the effect of reducing and stabilizing expansion force is achieved, and smooth expansion construction is ensured. Through practical testing, the high-chromium dual-phase stainless steel expansion pipe treated by the process has the advantages that the pressure is about 30% lower than that of an untreated material in the expansion process, the expansion pressure is kept unchanged along with the increase of the expansion length, the installation construction of the high-chromium dual-phase stainless steel expansion pipe with large length and large expansion rate is possible, and the application range of the high-chromium dual-phase stainless steel expansion pipe is widened.

Description

technical field [0001] The invention relates to the technical field of preparation of high-chromium dual-phase steel expansion pipes, in particular to a preparation method of high-chromium dual-phase steel expansion pipes. Background technique [0002] With the oil and gas industry's response to high acid gas (CO 2 , H 2 S) In the development of natural gas reservoirs, high-chromium dual-phase steel casings and oil pipes have been widely used. The use of expansion pipes to repair these high-chromium duplex steel casings and oil pipes has been applied to a certain extent. However, the traditional low-carbon steel expansion tube is not suitable for natural gas reservoirs with high acid gas content due to its poor corrosion resistance. High-chromium pipes, such as 2205 dual-phase steel and 2507 dual-phase steel, although the overall ductility is high, the yield strength of the material is also high (>580 MPa), and at the same time, the surface hardness of the dual-phase s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/18C21D1/42C21D7/04B05D7/14B05D7/22
CPCB05D7/14B05D7/222C21D1/18C21D1/42C21D7/04C21D9/08Y02P10/25
Inventor 岳克功范华永孙兴旺王鹏飞田旭光
Owner 东营普洛孚能源技术有限公司