High-strength low-chromium anti-corrosion petroleum pipe special for low CO2 environment

Abstract

The invention provides a high-strength low chromium anticorrosive special tube used in low CO2 environment, which comprises the following compositions in weight percentage: 0.10 to 0.20 percent of C, 0.15 to 0.40 percent of Si, 0.50 to 0.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.25 percent of Ni, 2.0 to 4.0 percent of Cr, 0.10 to 1.0 percent of Mo, less than or equal to 0.20 percent of Cu, 0.010 to 0.040 percent of Als, 0.030 to 0.10 percent of N, and the balance being Fe and unavoidable impurities. The petroleum special tube has the advantages of high strength, excellent toughness and excellent corrosion resistance. The underground corroding speed rate can reach one eighth to one tenth of C-Mn steel, and reach one third to one second of the C-Mn steel in laboratory simulation test, so the special tube is an energy-saving anticorrosive material with long service period and low cost, and can be applied to oil-gas fields with low contents of carbon dioxide and sulfurated hydrogen and low output.

Description

technical field [0001] The present invention relates to a low CO 2 High-strength low-chromium corrosion-resistant petroleum special pipe for environmental use. Background technique [0002] Corrosion is a common phenomenon in the oil and gas industry, often causing significant economic losses to oil and gas fields and seriously polluting the environment. Especially when the water content in the oil field is getting higher and higher, the number of deep wells and ultra-deep wells is increasing, and the oil wells in a strong corrosive environment are continuously developed, CO injection 2 Today, when enhanced oil recovery technology is widely promoted, CO 2 、H 2 S, Cl - Corrosion has become an important problem that plagues the development of the oil and gas industry. [0003] CO at home and abroad 2 There are many examples of corrosion, such as the CO 2 During the EOR field trial, it was found that in the absence of CO suppression 2 When taking corrosion measures, the...

AI Technical Summary

Problems solved by technology

The addition of rare earth elements to steel is controversial internationally. Many international bidding documents have clearly stipulated that the use of rare earth elements is not allowed, which also increases the cost and difficulty of smelting.

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