Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Austenitic stainless steel with high sulfur resistance and acid and alkali resistance for oil casing

An austenitic stainless steel, acid and alkali resistance technology, applied in the field of austenitic stainless steel, can solve the problems of limited improvement of austenitic stainless steel anti-sulfur and acid and alkali resistance, and it is difficult to meet the requirements of oil casing. , to achieve the effect of improving absorption rate and alloying effect, excellent corrosion resistance and deformation performance, and improving corrosion resistance

Inactive Publication Date: 2015-08-12
BLOOMING DRILLING RIG
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, austenitic stainless steel is a stainless steel with austenitic structure at room temperature, which has high corrosion resistance, good cold workability, toughness, plasticity, weldability and non-magnetic properties, while oil casing is a kind of Important equipment for oil drilling needs to face complex geological environments during the drilling process, especially high-sulfur and high-acid-alkaline formations. Therefore, austenitic stainless steel is usually used as the main pipe material for oil casings. How to effectively improve The high sulfur resistance and acid and alkali resistance of austenitic stainless steel, and thus the protection of the safe and stable operation of oil casing has become an important issue; the existing austenitic stainless steel for oil casing is mainly through increasing the Mo, Cu At the same time, reduce the content of C element to achieve the purpose of improving the sulfur resistance and acid and alkali resistance of austenitic stainless steel. However, this method has a limited effect on the improvement of the sulfur resistance and acid and alkali resistance of austenitic stainless steel. It is still difficult to meet the requirements for the use of oil casing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] An austenitic stainless steel with high sulfur resistance and acid and alkali resistance for oil casing pipes of the present invention contains: 0.02% of C, 5% of Si, 25% of Cr, 28% of Ni, 2.5% Al, 2% Mo and 1.5% Cu, the balance is Fe and unavoidable impurities; stainless steel with this composition has general sulfur resistance and acid and alkali corrosion resistance.

Embodiment 2

[0012] An austenitic stainless steel with high sulfur resistance and acid and alkali resistance for petroleum casing pipes of the present invention contains: 0.015% of C, 8% of Si, 12% of Cr, 20% of Ni, 0.8% Al, 1% Mo and 0.8% Cu, the balance is Fe and unavoidable impurities; stainless steel with this composition has better sulfur resistance and acid and alkali corrosion resistance, but austenite The stability of the organization is average.

Embodiment 3

[0014] An austenitic stainless steel with high sulfur resistance and acid and alkali resistance for petroleum casing pipes of the present invention contains: 0.015% of C, 6% of Si, 13% of Cr, 24% of Ni, 1% Al, 1.5% Mo and 1% Cu, the balance is Fe and unavoidable impurities; carbon (C) is relatively sensitive to the corrosion resistance of high-silicon stainless steel, in the face of high concentration Nitric acid, high-silicon stainless steel with a carbon mass fraction of 0.03%, will still have intergranular corrosion, but high-silicon stainless steel with a carbon mass fraction of 0.02% will not appear; in a high-sulfur environment, the most important thing to improve the corrosion resistance of stainless steel The elements from high to low are silicon (Si), chromium (Cr) and aluminum (Al). When the mass fraction of silicon is controlled to 5-8%, and the mass fraction of chromium is less than 15%, stainless steel has a stable austenitic body structure, and has excellent corr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses the technical field of austenitic stainless steel, and in particular relates to high sulfur resisting and acid-base resisting austenitic stainless steel applied to oil casings. The high sulfur resisting and acid-base resisting austenitic stainless steel applied to oil casings is high in sulfur resistance and acid-base resistance and can effectively respond to complicated geological environment and limitedly meet the requirements in oil drilling. The high sulfur resisting and acid-base resisting austenitic stainless steel applied to oil casings comprises the following components in percentage by weight (wt%): less than 0.02% of C, 5-8% of Si, 12-25% of Cr, 20-28% of Ni, 0.8-2.5% of Al, 1-2% of Mo, 0.8-1.5% of Cu, and the balance of Fe and inevitable impurities.

Description

technical field [0001] The invention relates to the technical field of austenitic stainless steel, in particular to an austenitic stainless steel with high sulfur resistance and acid and alkali resistance for petroleum casing. Background technique [0002] As we all know, austenitic stainless steel is a stainless steel with austenitic structure at room temperature, which has high corrosion resistance, good cold workability, toughness, plasticity, weldability and non-magnetic properties, while oil casing is a kind of Important equipment for oil drilling needs to face complex geological environments during the drilling process, especially high-sulfur and high-acid-alkaline formations. Therefore, austenitic stainless steel is usually used as the main pipe material for oil casings. How to effectively improve The high sulfur resistance and acid and alkali resistance of austenitic stainless steel, and thus the protection of the safe and stable operation of oil casing has become an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44
Inventor 黄建华
Owner BLOOMING DRILLING RIG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com