Nickel-containing corrosion-resistant steel pipe for ultrahigh-strength drill rod and manufacturing method of nickel-containing corrosion-resistant steel pipe

A technology of ultra-high strength and manufacturing method, which is applied in the field of drill pipes, can solve problems such as corrosion resistance of drill pipes without consideration, achieve the effect of ensuring high strength and toughness matching, reducing manufacturing cycle, and improving service safety

Active Publication Date: 2018-08-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently designed 165ksi (1138MPa) ultra-high-strength drill pipe is mainly to adjust the content of alloy elements such as Mn and Mo in the material on the basis of ordinary drill pipe materials, or to add micro-alloy strengthening elements such as V to improve the strength of the drill pipe. The corrosion resistance of the drill pipe is not considered, and the ultra-high-strength drill pipe is prone to corrosion-related failure accidents during use

Method used

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  • Nickel-containing corrosion-resistant steel pipe for ultrahigh-strength drill rod and manufacturing method of nickel-containing corrosion-resistant steel pipe
  • Nickel-containing corrosion-resistant steel pipe for ultrahigh-strength drill rod and manufacturing method of nickel-containing corrosion-resistant steel pipe
  • Nickel-containing corrosion-resistant steel pipe for ultrahigh-strength drill rod and manufacturing method of nickel-containing corrosion-resistant steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the composition in the following table 1, it was smelted into a round steel billet. After the steel billet is uniformly heated at 1000°C, it is rolled and pierced, and the final rolling temperature is controlled at 950°C; the steel pipe is heated to 900°C and kept for 55 minutes, and then the steel pipe is cooled to room temperature with water as the quenching liquid; the cooled steel pipe is heated to 580 ℃, heat preservation for 40 minutes, and rapid cooling to room temperature with water as the cooling medium. The mechanical properties and corrosion properties of the obtained steel pipes are shown in Table 2.

[0028] Table 1 shows the chemical composition of steel pipes for drill pipes in Examples 1 to 3 of the present invention, and Table 2 shows the test results of Examples 1 to 3 of the present invention. The performance is obviously better than that of the existing certain 2 shown in Table 3. Kind of steel pipe. The manufacturing method of embodime...

Embodiment 4

[0037] According to the following composition, it is smelted into a round billet, and its chemical composition (mass percentage) is C: 0.22%, Si: 0.20%, Mn: 1.2%, Cr: 1.0%, Mo: 1.3%, Ni: 2.0%, S≤ 0.004%, P≤0.008%, [Cr]+[Mo]+[Ni]=4.3%, the rest is iron and unavoidable impurities. After the steel billet is evenly heated at 980°C, it is rolled and pierced, and the final rolling temperature is controlled at 920°C; the steel pipe is heated to 880°C and kept for 40 minutes, and then the steel pipe is cooled to room temperature with water as the quenching liquid; the cooled steel pipe is heated to 560 ℃, keep warm for 50 minutes, and use water as the cooling medium for rapid cooling.

Embodiment 5

[0039]According to the following composition, it is smelted into a round billet, and its chemical composition (mass percentage) is C: 0.18%, Si: 0.35%, Mn: 0.8%, Cr: 0.6%, Mo: 0.9%, Ni: 3.0%, S≤ 0.003%, P≤0.009%, [Cr]+[Mo]+[Ni]=4.5%, the rest is iron and unavoidable impurities. After the steel billet is uniformly heated at 1080°C, it is rolled and pierced, and the final rolling temperature is controlled at 1020°C; the steel pipe is heated to 920°C and kept for 70 minutes, and then the steel pipe is cooled to room temperature with water as the quenching liquid; the cooled steel pipe is heated to 600 ℃, keep warm for 30 minutes, and use water as the cooling medium for rapid cooling.

[0040] The metallographic structure of the steel pipe material obtained by the present invention using the above material and heat treatment process is tempered sorbite, the yield strength is greater than 1138MPa, the tensile strength is greater than 1206MPa, the elongation is greater than 15%, and...

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Abstract

The invention relates to a nickel-containing corrosion-resistant steel pipe for an ultrahigh-strength drill rod and a manufacturing method of the nickel-containing corrosion-resistant steel pipe. Themanufacturing method comprises the following steps that a steel billet is smelted according to the following components of, by mass, 0.15 to 0.22% of C, 0.20 to 0.35% of Si, 0.8 to 1.2% of Mn, 0.6 to1.0% of Cr, 0.9 to 1.3% of Mo, 2.0 to 3.0% of Ni, less than or equal to 0.005% of S, less than or equal to 0.01% of P, and the balance iron and inevitable impurities; the steel billet is uniformly heated, and rolling and perforating are carried out to obtain a steel pipe; and heat treatment is carried out on the steel pipe, and then the steel pipe is cooled to room temperature to obtain the nickel-containing corrosion-resistant steel pipe for the ultrahigh-strength drill rod. According to the method, the chemical components of the steel pipe material are controlled, and all the components cooperate with one another; the drill rod has no obvious corrosion after placed in a drilling fluid for 168 service hours, so that service safety of the drill rod is greatly improved; and water is adoptedas a cooling liquid in a high-temperature tempering process, cooling speed is obviously higher than an air cooling speed currently used, so that the manufacturing period of the drill rod is greatly shortened.

Description

technical field [0001] The invention relates to the field of drill pipes, in particular to a nickel-containing corrosion-resistant steel pipe for ultra-high-strength drill pipes and a manufacturing method thereof. Background technique [0002] Drill pipe is an important tool in the process of oil and gas drilling development. The service safety of drill pipe plays an important role in ensuring the quality and speed of drilling. With the exploration and development of deep oil and gas resources and the popularization and application of advanced drilling technologies, the service load of drill pipes is becoming more and more stringent. In order to meet the needs of drilling operations, drill pipe manufacturers have successively designed and developed 165ksi (1138MPa) ultra-high strength drill pipes. Patents CN102268614A, CN104651750A, CN103938095B and CN102268609A proposed 165ksi steel grade drill pipes and their manufacturing methods, using alloys such as C, Si, Cr, Mn and Mo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C21D8/10C21D1/18C21D9/08C21D1/60
CPCC21D1/18C21D1/60C21D8/105C21D9/08C21D2211/00C22C38/02C22C38/04C22C38/44
Inventor 李方坡王建军冯耀荣韩礼红
Owner BC P INC CHINA NAT PETROLEUM CORP
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