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

Abstract

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 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 an Fe-based austenitic alloy oil casing and a manufacturing method for high-acid deep wells. 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 4,400,209 discloses a nickel-based alloy...

AI Technical Summary

Problems solved by technology

The industrial demand for oil casing pipes is far greater than that of superalloy pipes. Therefore, although the above method can improve the production efficiency of superalloy pipe blanks, the heating temperature is between 1040 and 1140 ° C, so that the extrusion rate cannot meet the needs of oil casing pipes. industrialization needs

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