Sulfate reducing bacteria corrosion-resistant oil well pipe and production method thereof

Abstract

The invention relates to a sulfate reducing bacteria corrosion-resistant oil well pipe and a production method thereof. The sulfate reducing bacteria corrosion-resistant oil well pipe consists of the following chemical components in percentage by weight: 0.12 percent or less of C; 0.15 to 0.45 percent of Si; 0.7 percent or less of Mn; 8.5 to 25 percent of Cr; 0.15 to 2.5 percent of Cu; 0.5 to 3.5 percent of Al; and the balance of Fe and inevitable impurities. The production method for the sulfate reducing bacteria corrosion-resistant oil well pipe includes the following steps: the chemical components are smelted and continuously cast into a round billet or cast into a square billet which is then rolled into a round billet; after hot rolling, a seamless steel pipe is produced; high-temperature solution heat treatment is carried out, the heating temperature is 950 DEG C to 1200 DEG C, and the temperature-keeping time is 30 to 120 minutes; the tempering temperature is 650 DEG C to 750 DEG C, and the tempering temperature-keeping time is 60 to 90 minutes; sizing and straightening are carried out, the hot straightening temperature is higher than 450 DEG C, and therefore the oil well pipe is produced. The oil well pipe produced by the method can effectively resist SRB (sulfate reducing bacteria) corrosion in external environment, moreover, the yield strength of the oil well pipe is greater than 380MPa, thus meeting the requirement of J55 steel grade, and better meeting the requirements of production strings for water injection wells under harsh environment.

Description

technical field [0001] The invention relates to an oil well pipe for oil and gas wells, in particular to an oil well pipe resistant to sulfate-reducing bacteria corrosion and a manufacturing method thereof. Background technique [0002] High pour point oil reservoirs are widely distributed in the world, with extremely rich geological reserves. my country's Liaohe, Jilin, Dagang, Henan and other oil fields have considerable reserves of high pouring oil reservoirs, and their common characteristics are high wax content and high freezing point. Due to the special properties of high pour point oil reservoirs, normal temperature water injection development can effectively improve the ultimate recovery of the reservoir. However, due to long-term large-scale water injection, a low-temperature zone is formed around the water injection well, and its temperature and other conditions are suitable for the growth and reproduction of bacteria. And because the injected water continuously ...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a sulfate-reducing bacteria (SRB) corrosion-resistant oil well pipe and its manufacturing method to overcome the problem of oil well pipe corrosion caused by the proliferation of SRB

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