110 ksi-grade oil sleeve having high resistance to co2 corrosion and its preparation method

A 1.110ksi, manufacturing method technology, applied in casing, drill pipe, earthwork drilling, etc., can solve problems such as low toughness

Inactive Publication Date: 2013-01-02
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of 110ksi level high anti-CO 2 Corrosion oil casing and its manufacturing method, especially through the microalloying of low carbon and N, mainly solve the problem of low toughness of high-strength and high-carbon 13Cr martensitic stainless steel oil casing steel in the production process, and its low temperature of -10 ℃ Impact toughness can reach above 40J

Method used

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  • 110 ksi-grade oil sleeve having high resistance to co2 corrosion and its preparation method

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Embodiment 1

[0029] The composition weight percentage of oil casing is: C: 0.06%, Si: 0.4%, Mn: 0.5%, Cr: 12.0%, Ni: 0.9%, Mo: 0.5%, N: 0.03%, the rest is Fe and unavoidable impurity elements. Blooms are smelted and continuously cast into blooms in electric furnaces. Warm ingots are put into the furnace for preliminary rolling, and the surface temperature of the steel ingots in the furnace is less than 600°C. The round billets are annealed after rolling, and the annealing temperature is controlled between 570 and 640°C. The annealing time is controlled within 5 hours, and the annealed tube blank is heated at 1170°C to 1250°C for 1.6 hours and then pierced and hot rolled into a blank tube; ℃, and the tempering time is controlled within 1 hour, so as to obtain 110 steel grade oil casing products.

Embodiment 2

[0031] The composition weight percentage of oil casing is: C: 0.10%, Si: 0.5%, Mn: 0.2%, Cr: 13.1%, Ni: 0.5%, Mo: 0.2%, N: 0.035%, the rest is Fe and unavoidable impurity elements. Blooms are smelted and continuously cast into blooms by electric furnaces. Warm ingots are put into the furnace for preliminary rolling, and the surface temperature of the steel ingots in the furnace is less than 600°C. The round billets are annealed after rolling, and the annealing temperature is controlled between 580 and 600°C. The annealing time is controlled within 6 hours, and the annealed tube blank is heated at 1150°C to 1230°C for 1.8 hours and then pierced and hot rolled into a blank tube; after the hot rolled steel pipe is water quenched at 900 to 980°C, ℃, and the tempering time is controlled within 1 hour, so as to obtain 110 steel grade oil casing products.

[0032] The chemical composition of other examples is shown in Table 1. The comparative example is Chinese patent 200610028252....

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Abstract

Disclosed are a 110 ksi-grade oil sleeve having high resistance to CO2 corrosion and its preparation method. The oil sleeve contains C 0.05-0.14 wt%, Si 0.2-0.5 wt%, Mn 0.20-1.0 wt%, Cr 12.0-14.0 wt%, Ni 0.5-1.5 wt%, Mo 0.2-1.0 wt%, N 0.03-0.08 wt%, and Fe and unavoidable impurity elements in balance. Through low carbon and nitrogen microalloying, the invention solves the problem of low toughness of steel for high-strength high-carbon 13Cr martensitic stainless steel oil sleeve.

Description

technical field [0001] The invention relates to steel for oil casing and its manufacturing method, in particular to 110ksi grade high resistance to CO 2 Corroded oil casing and method of manufacture. Background technique [0002] With the intensification of my country's oil and gas development, oil well casings and tubing for collecting oil and gas are facing high temperature, high pressure, and high CO content. 2 , Cl - The strong corrosive environment that coexists with other oil and gas fields has caused multiple downhole tubing breaks and gas gathering trunk leakage accidents in oil and gas fields, causing many oil and gas field wells to be scrapped ahead of schedule due to such problems after being put into production for about one year, causing huge losses and killing the lives of the people. It has caused serious harm to national energy security and property security. [0003] In the existing API 5CT specification, there are L80-13Cr oil casing products, which can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D8/10E21B17/00
Inventor 张忠铧刘俊江张春霞
Owner BAOSHAN IRON & STEEL CO LTD
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