Ni-based alloy oil sleeve and manufacturing method for high-acidity deep well

Abstract

The invention relates to a Ni-based alloy oil sleeve for a high-acidity deep well, which comprises the following components in percentage by mass: less than or equal to 0.02 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.5 percent of Si, less than or equal to 1.0 percent of Mn, 40 to 60 percent of Ni, 20 to 30 percent of Cr, 1 to 10 percent of Mo, 1 to 5 percent of W, 0 to 5 percent of Co, 0.1 to 3.0 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, less than or equal to 1.5 percent of Ti, and the balance of Fe and inevitable impurities. In the invention, the thermal extrusion processing performance and corrosion resisting performance of the alloy are effectively ensured by controlling the contents of the Al and O. The 90 to 140 ksi steel-grade Ni-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,150 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

Description

technical field [0001] The invention relates to an oil casing and a manufacturing method, in particular to a high-strength Ni-based alloy oil casing and a manufacturing method for high-acid deep wells resistant to stress corrosion cracking. Background technique [0002] With the increasingly severe energy crisis, more and more sour deep oil and gas wells are being exploited. Acidic deep wells can even reach a depth of 6,000 to 10,000 meters, a downhole temperature of up to 320°C, and a downhole gas pressure of up to 100 MPa. 2 S, CO 2 Partial pressure high, H 2 The S content is as high as 40%, and elemental sulfur is precipitated during the mining process and there is a very high concentration of chloride ion salt solution (up to 150,000ppm or more). In order to meet such high temperature, high pressure, high CO 2 、H 2 S partial pressure and high salinity oil wells and gas wells require high-alloy stainless steel and nickel-based alloy oil casings. [0003] U.S. Patent...

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