Medium and high strength oil casing for resisting sulfurated hydrogen corrosion and manufacturing method thereof

Abstract

The invention discloses a middle-high strength oil sleeve used for resisting hydrogen sulfide corrosion and a manufacture method thereof. The sleeve comprises the following compositions by weight percentage: 0.20 to 0.27 percent of C, less than or equal to 0.40 percent of Si, 0.80 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of Si, 0.30 to 0.75 percent of Mo, 0.95 to 1.40 percent of Cr, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, less than or equal to 0.02 percent of Al, and the balance being Fe. The method comprises the following steps: a circular tube blank is manufactured by molten iron and scrap steel through smelting, external refining, vacuum degassing and arc continuous casting; the circular tube blank is manufactured into a plain tube by rolling the tube blank with hot rolling; and the plain tube is manufactured into a finished product through modified thermal treatment and tube processing. The middle-high strength oil sleeve has the advantages of excellent physicochemical performance, application performance, sulfureted hydrogen stress corrosion resistance, and a threshold value of the sulfureted hydrogen stress corrosion resistance of the oil sleeve reaches over 90 percent of SMYS.

Description

technical field [0001] The invention belongs to an oil well pipe and a manufacturing method thereof, in particular to a medium-high-strength oil casing pipe with a yield strength lower than 758MPa (110ksi) for anti-hydrogen sulfide corrosion and a manufacturing method thereof. Background technique [0002] carbon steel or low alloy steel exposed to H 2 In the environmental medium of S, the hydrogen produced by corrosion invades into the steel, and sulfide stress corrosion cracking (SSCC) will occur under the action of stress. The main problem facing the development of sulfur-containing oil and gas fields is H 2 S corrosion problem. In my country, sulfur-containing oil and gas fields are mainly distributed in Sichuan, North China, and Xinjiang, among which, especially in the eastern Sichuan region, the hydrogen-induced cracking and sulfide stress corrosion cracking will cause early failure of oil casing (tubing and casing) and even lead to Catastrophic accidents occur, so th...

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