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A kind of corrosion-resistant high anti-extrusion petroleum casing and its production method

A kind of oil casing, high resistance technology, applied in the direction of casing, drill pipe, earthwork drilling and mining, etc., can solve the problems of poor impact toughness and corrosion resistance in the weld zone, and achieve high and uniform anti-external pressure crushing strength Consistent strength and toughness, the effect of saving procurement costs

Active Publication Date: 2016-11-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are obvious differences in the composition, structure and stress state between the HFW weld zone and the base metal, resulting in poor impact toughness and corrosion resistance in the weld zone.

Method used

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  • A kind of corrosion-resistant high anti-extrusion petroleum casing and its production method
  • A kind of corrosion-resistant high anti-extrusion petroleum casing and its production method
  • A kind of corrosion-resistant high anti-extrusion petroleum casing and its production method

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Embodiment Construction

[0039] The present invention is described in further detail below in conjunction with accompanying drawing:

[0040] 1) see figure 1 , 2 , 3-1, 3-2, 4, 5, 6, 7, 8, the chemical compositions of the embodiments of the present invention and comparative examples are shown in Table 1.

[0041] Table 1 embodiment and comparative example chemical composition (wt %)

[0042]

[0043] 2) The geometric accuracy control range of the bushing is as follows:

[0044] Take the casing with the specification of Φ139.7mm×9.17mm as an example. Outer diameter: 139.65~139.98, outer diameter out of roundness: <0.3%; wall thickness: 9.15~9.33, wall thickness unevenness: <2.0%.

[0045] 3) The casing adopts welding seam rolling and annealing treatment, and the annealing temperature is 850-1000°C.

[0046] 4) The casing adopts the medium frequency induction heating method, heats the HFW welded pipe at a heating rate of 20-60°C / s to above the Ac3 temperature, and then enters the rolling unit at...

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Abstract

The invention discloses a corrosion-resistant high-extrusion-resistant petroleum casing and a production method thereof. The chemical composition ratio of the steel type is: C: 0.18-0.30wt%; Si: 0.20-0.35wt%; Mn: 0.90-1.30 wt%; Cr: 0~0.50wt%; Ti: 0.01~0.07wt%; Mo: 0.15~0.35wt%; V: 0.01~0.05wt%; Ni: 0~0.25wt%; Nb: 0~0.05wt% ; B: 0.001~0.005wt%; Y: 0.002~0.01wt%; P: ≤0.008wt%; S: ≤0.004wt%; the balance is Fe. The casing adopts the process of "micro-alloyed controlled rolling and controlled cooling steel plate + FFX forming + high frequency resistance welding + weld rolling and annealing treatment + thermal tension reducing + whole pipe quenching and tempering treatment + thermal sizing and thermal straightening" Manufactured. The product of the present invention has high resistance to external pressure crushing strength, good impact toughness, H 2 S / CO 2 / Cl ‑ Excellent corrosion performance characteristics.

Description

Technical field: [0001] The invention belongs to the field of petroleum casing, and relates to a casing used for development of oil and gas deep wells and ultra-deep wells, in particular to a corrosion-resistant and high-collapse-resistant petroleum casing and a production method thereof. Background technique: [0002] With the increasing demand for oil and gas resources in the national economy, many deep wells, ultra-deep wells and other oil and gas wells in complex formations have been continuously developed. h 2 S, CO 2 , Cl - corrosion problem. Such as oil and gas fields in Xinjiang and Sichuan in my country, oil and gas fields in South Texas and Paolo in the United States, and Alberta in Canada. Therefore, it is necessary to develop high-extrusion-resistant casing products with certain corrosion resistance to meet the needs of severe well conditions such as high temperature, high pressure, rock formation creep, and corrosive media. [0003] At present, seamless pip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/50C21D8/02B21C37/08C21D8/10C21D9/08E21B17/01
Inventor 毕宗岳王军张峰张锦刚韦奉李周波赵坤何石磊王亮李远征王涛苏琬
Owner BC P INC CHINA NAT PETROLEUM CORP
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