Steel pipe for borehole operation of 150ksi steel grade high toughness oil and gas well and production method thereof

Abstract

The invention provides a steel pipe for borehole operation of 150ksi steel grade high toughness oil and gas well and a production method thereof. The components of the steel pipe are as follows by weight percentage: 0.22%-0.26% of C, 0.15%-0.35% of Si, 0.40%-0.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.90%-1.10% of Cr, 0.70%-0.80% of Mo, 0.10%-0.15% of V, and the balance being Fe. The production method of the invention utilizes scrap steel and sponge iron or molten iron as steelmaking raw materials, after going through electric arc furnace smelting, external refining and vacuum degassing, continuous casting is carried out on the raw materials to mold round billets, and then high-precision hot rolling is carried out on the round billets to mold seamless steel pipes for quenching and heat treatment, finally the hollow plain end seamless steel pipes are obtained. The product has the beneficial effects that the steel pipe features good physical and chemical properties, can be applied to borehole testing of the oil and gas well with high density of rock and increasing production operations such as perforation, fracturing and the like, and 150ksi grade steel pipe strength and toughness matched thereof ensures the security of the whole borehole operation system in the situation.

Description

technical field [0001] The invention relates to a 150ksi steel grade high-strength toughness steel pipe for downhole operation of oil and gas wells and a production method thereof. Background technique [0002] In recent years, due to the rapid development of the global economy, the ups and downs of oil prices in the international market, and the increasing gap in energy demand, oil companies in various countries are increasing their operations around the world. Perforation operation is an economical and effective way to enhance oil and gas recovery in the process of oil and gas production, and it is widely used by major oil companies and operation service companies. This has not only led to a rapid increase in the global demand for seamless steel pipes, mainly oil pipes, including casings, oil pipes, drill pipes and accessories, but also for perforating gun barrels produced in small batches in the past. grow up. [0003] Perforation is an extremely important technology in...

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Problems solved by technology

[0010] However, the general law of steel materials shows that its strength and toughness show a trend of trade-offs. The higher the strength, the tougher it is difficult to improve.

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