Rare-earth-containing high-strength high-toughness seamless steel tube for shale gas and preparation method thereof

Abstract

The invention discloses a rare-earth-containing high-strength high-toughness seamless steel tube for shale gas. The seamless steel tube is prepared from, by mass, 0.23%-0.27% of C, 0.17%-0.37% of Si,0.45%-0.65% of Mn, 0.8%-1.2% of Cr, 0.60%-0.80% of Mo, 0.06%-0.10% of V, 0.01%-0.04% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S and 0.006-0.010% of RE. The invention discloses a preparation method. According to the rare-earth-containing high-strength high-toughness seamless steel tube for shale gas, rare earth elements are added into the Cr-Mo series steel, the modification and microalloying of the rare earth elements not only makes the steel have high strength and crush resistance but also has high toughness, especially high transverse impact toughness, and the seamless steel tube can meet the working condition requirements of shale gas exploitation and has good popularization value.

Description

technical field [0001] The invention relates to the technical field of material metallurgy, in particular to a rare earth-containing high-strength and high-toughness seamless steel pipe for shale gas and a preparation method thereof. Background technique [0002] Shale gas is often distributed in thicker shale source rock formations in the basin. Compared with conventional natural gas, shale gas development has the advantages of long mining life and long production cycle. The shale gas resources in major basins and regions in China are about 15 trillion to 30 trillion cubic meters, and the mining life can generally reach 30 ~50 years or even longer, the economic value is huge, but the geological conditions of shale formations are complicated, the mining is difficult, and the casing damage is high. In recent years, oil fields tend to adopt non-API special casings specially designed for shale formations. High strength, strong collapse resistance, and good toughness are requir...

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Problems solved by technology

Compared with conventional natural gas, shale gas development has the advantages of long mining life and long production cycle. The shale gas resources in major basins and regions in China are about 15 trillion to 30 trillion cubic meters, and the mining life can generally reach 30 ~50 years or even longer, the economic value is huge, but the geological conditions of shale formations are complicated, the mining is difficult, and the casing damage is high. In recent years, oil fields tend to adopt non-API special casings specially designed for shale formations. High strength, strong collapse resistance and good toughness are required, so the development of high-value-added high-strength and high-toughness shale gas seamless steel pipes has become an urgent need for major steel mills

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