High-strength and high-toughness oil casing and manufacturing method thereof

A technology of oil casing and manufacturing method, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., which can solve the problems of increased raw material cost, difficult control, poor dimensional accuracy of the pipe body, etc., and achieves consistent performance and high dimensional accuracy , Eliminate the effect of weld streamline

Active Publication Date: 2013-07-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] At present, the high-strength oil casing mainly adopts the seamless steel pipe manufacturing process, adopts quenching and tempering heat treatment method to achieve the required strength level, and generally adds more precious alloy elements such as Cr, Mo, V, etc., which increases the cost of raw materials; at the same time, the seamless pipe The forming adopts perforation forming, which is difficult to control, the dimensional accuracy of the pipe body is relatively poor, and the control accuracy limit of the wall thickness uniformity is ±5%

Method used

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  • High-strength and high-toughness oil casing and manufacturing method thereof
  • High-strength and high-toughness oil casing and manufacturing method thereof
  • High-strength and high-toughness oil casing and manufacturing method thereof

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Embodiment Construction

[0028] see Figure 1-5 , TMCP hot-rolled coil raw material composition (wt%): C: 0.26, Si: 0.25, Mn: 1.25, P: 0.011, S: 0.002, Cr: 0.55, Mo: 0.3, Ni: 0.22, B: 0.0012, Nb +V+Ti≤0.08.

[0029] First, prepare the HFW welded pipe: the TMCP hot-rolled coil with the above-mentioned chemical composition and high dimensional accuracy with a wall thickness deviation of -0.15 ~ +0.15 mm is subjected to longitudinal shearing of the steel strip, ultrasonic testing of the steel strip, edge milling, FFX forming and HFW Welding, adjusting the forming process (opening angle 5°, extrusion amount 3mm), controlling welding parameters (welding power 390KW, welding speed 18m / min) to weld a straight seam welded pipe with a specification of Φ193.7×10.05mm, and proceed immediately after welding The internal and external weld burrs are trimmed, the internal burr scraping groove and the external burr residual height are both ≤0.20mm, so that the weld bead and the inner and outer surfaces of the pipe a...

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Abstract

The invention discloses a high-strength and high-toughness oil casing and a manufacturing method thereof. A 'HFW(High Frequency Welding)+welding line on-line thermal treatment+hot tension reducing+whole casing thermal treatment' technology is used for manufacturing a Q125 steel grade oil casing, and the weight percentage of chemical components are as follows: C: 0.18-0.30; Sh: 0.10-0.35; Mn: 1.00-1.30; P: not more than 0.018; S: not more than 0.008; Cr: 0.20-1.20; Mo: 0.20-0.55; Nh: 0.10-0.56; B: 0.0010-0.0015; Nb+V+Ti: not more than 0.08; and the balance of Fe and unavoidable impurities. For the Q125 oil casing produced by the manufacturing method, the yield strength is not less than 865MPa, the tensile strength is not less than 940MPa, the specific elongation is not less than 23.2%, at 0 DEG C, the full-scale transverse impact energy is not less than 105J and the longitudinal impact energy is not less than 110J. The Q125 steel grade oil casing produced by the technology is excellent in comprehensive performance, and has excellent high toughness and high plasticity.

Description

technical field [0001] The invention belongs to a high-strength straight seam welded oil casing and a manufacturing method thereof, in particular to a Q125 steel grade SEW oil casing using a new production process and a manufacturing method thereof. Background technique [0002] As the oil production conditions in various oil fields are getting worse, especially the development of deep wells and ultra-deep wells is increasing, oil and gas fields have higher and higher performance requirements for oil well pipes, and the demand for high-strength casing is also increasing; at the same time, The cost of oil and gas extraction and drilling has increased linearly, and the value of pipes accounts for more than 60% of the extraction cost. Therefore, it is of great economic significance to develop economical high-strength oil casing. In the API standard specification, the transverse impact energy of the oil casing of Q125 steel grade only needs to reach 26J; in practical applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D8/10E21B17/01
Inventor 毕宗岳李周波张峰张锦刚何石磊王军韦奉李远征王涛王亮党涛白鹤唐俊苏琬
Owner BC P INC CHINA NAT PETROLEUM CORP
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