Round blank for high-steel level oil bushing and manufacturing process

Abstract

The invention relates to a round bland in a new type of steel and a manufacturing process. An oil bushing, in particular P110 high-steel level oil bushing, is used for deep well and environment having complicated layer conditions, and requires higher demand on quality of round tube blank for the oil bushing. At present, there mainly are C-Mn steel serial, Mo-containing steel serial, the C-Mn steel serial are more economical but relatively more inferior in intensity, toughness and metallurgical structure of the steel; the Mo-containing steel serial has good intensity, toughness and high temperature resistance but with cost thereof being increased dramatically. The invention uses a measure that control C content, higher Mn content and adds a particular amount of Cr, which meets the demand of intensity of the steel pipe, and the invention designs new type of steel and the manufacturing process thereof. The main components are (based on weight percent): C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P is not more than 0.025%, S is not more than 0.025%, Al=0.01-0.03%, and Fe in equilibrium amount, diameter of the round blank is 150 to 200 mm; the invention employs the procedures of top-bottom re-blowing rotary furnace-LF refining furnace-VD vacuum refining furnace-round blank continuous caster-turn-over cooling bed-checkup-warehousing.

Description

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AI Technical Summary

Benefits of technology

This patented technology solves problems associated with making strong but hardened materials like cathode ray tubular or spiral welded seamless steel plates used on oil well drilling equipment such as wireline tools that are commonly found at sites where they come into contact during operations due to their extreme temperature conditions. These types of steels have been developed through different methods resulting in improved performance without adding extra costly metals. Additionally, this process helps reduce impurities from crude oils being processed while maintaining good quality standards.

Problems solved by technology

The technical problem addressed in this patents relates to improving the mechanical property, stability, reliability, and durable crack behavior of high-quality oil cased tubular drilling plugs made from these materials due to their superior characteristics including improved tensile stress, connectivity between cracks, reduced thermal response, lowered temperatures during use, prevention against rustiness or damage when exposed to severe environments like salt water environment.

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