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N80 steel grade oil casing and preparation method thereof

A technology of oil casing and steel grade, which is applied in the field of N80 steel grade oil casing and its preparation, can solve the problems of N80 impact power difference and high energy consumption of N80 oil casing, so as to improve strength, reduce energy consumption, reduce The effect of emissions

Inactive Publication Date: 2018-01-09
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of the N80 impact power difference produced by the existing non-quenched and tempered steel and the large energy consumption in the production process of the N80 petroleum casing, the present invention provides an N80 steel grade petroleum casing and a preparation method thereof

Method used

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  • N80 steel grade oil casing and preparation method thereof
  • N80 steel grade oil casing and preparation method thereof

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preparation example Construction

[0024] In one embodiment, the preparation method at least includes the following steps:

[0025] (1) Take scrap steel and microcrystalline graphite balls as raw materials, and obtain round billets after electric arc furnace smelting, ladle refining, and continuous casting;

[0026] (2) After the round tube blank is heated in a ring furnace, it is subjected to perforation treatment to obtain a capillary;

[0027] (3) The capillary tube is rolled to obtain a waste tube;

[0028] (4) After the waste pipe is subjected to micro-tension reduction and cooling treatment, thread processing is carried out to obtain N80 steel grade petroleum casing.

[0029] The following is a further explanation of the above preparation method:

[0030] Preferably, the mass ratio of scrap steel and microcrystalline graphite balls is (0.95~0.99): (0.05~0.01), and N80 steel grade petroleum casing has high strength and toughness through reasonable control of C, Mn, Cr, and V elements. Performance, scrap steel usuall...

Embodiment 1

[0040] Using scrap steel and microcrystalline graphite balls as raw materials, through 80t electric arc furnace smelting, ladle refining, and continuous casting, a round tube billet with a diameter of Φ160mm is produced. The weight percentage of its chemical composition is: C 0.28%, Si 0.25%, Mn 1.40 %, S 0.0015%, P0.008%, V 0.07%, Cr 0.15%, Al 0.025%, N 0.007%, Ni 0.03%, Cu 0.04%, the rest is Fe and unavoidable impurities.

[0041] After the round tube billet is heated by the ring furnace, pierced, rolled by the precision skew mill, micro-tension reduction, stepped cooling bed, and threaded, the N80 petroleum sleeve with an outer diameter of 139.7 mm and a wall thickness of 7.72 mm is made tube;

[0042] The weight percentage ratio of scrap steel to microcrystalline graphite balls is (0.95~0.99): (0.05~0.01).

[0043] In the heating process of the ring furnace, the temperature of the heating section is 1240~1280℃, the temperature of the soaking section is 1240~1260℃, and the discha...

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Abstract

The invention relates to the technical field of oil casings and particularly discloses an N80 steel grade oil casing and a preparation method thereof. The N80 steel grade oil casing comprises the following elemental compositions of, by weight, 0.26-0.30% of C, 0.15-0.35% of Si, 1.35-1.45% of Mn, 0.06-0.08% of V, 0.10-0.30% of Cr, 0.02-0.04% of Al, less than or equal to 0.002% of S, less than or equal to 0.01% of P, less than or equal to 0.01% of N, less than or equal to 0.005% of Ti, less than or equal to 0.08% of Ni, less than or equal to 0.08% of Cu, less than or equal to 0.01% of Mo, less than or equal to 0.01% of Nb and the balance Fe and inevitable impurity elements, wherein Mn / C is greater than or equal to 4. According to the N80 steel grade oil casing provided by the invention, an alloy composition system is simple, and the N80 steel grade oil casing has high strength and high toughness by reasonably controlling the elements of C, Mn, Cr and V.

Description

Technical field [0001] The invention relates to the technical field of petroleum casing, in particular to an N80 steel grade petroleum casing and a preparation method thereof. Background technique [0002] Oil well pipe is the most consumed material in oil and gas drilling and production. In oil field equipment assets, the value of oil well pipe accounts for about 60%. Every 1 m of drilling requires 62kg of oil well pipe. According to the purpose, it can be divided into oil production tubing and cementing casing. Various types of drill rods are used for pipes and drills. In recent years, with the rapid development of China’s petroleum industry, the market demand for oil casing has increased year by year. N80 steel grade oil casing is mainly used for oil and gas wells with a depth of 2000-4000m. The current demand in China is about 1.5 million tons. According to the API Spec 5CT standard, N80 steel grade can be delivered in a quenched and tempered state or in a non-quenched and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/42C22C38/44C22C38/46C22C38/28C22C38/20C22C38/22C22C38/24C22C38/02C22C38/04C22C38/06B21C37/06
Inventor 邓叙燕冯莹胡楚江
Owner DALIPAL PIPE
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