13Cr high anti-carbon dioxide and trace hydrogen sulfide corrosion tubing and casing steel and method for producing the same

A technology of carbon dioxide and oil casing, applied in the direction of temperature control, etc., can solve the problems of high carbon content and poor performance, and achieve the effect of simple ingredients

Active Publication Date: 2009-04-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Japanese Patent Laid-open No. Hei 4-224656 is suitable for 100-150°C, the strength requirement is 90-100 steel grade, and hydrogen sulfide does not crack at 0.007Mpa; the highest steel grade in Zhao 61-207550 and Hei 4-88152 patents can only reach 100Ksi. In addition, Higher carbon content, H 2 The performance of S is poor; while in JP-P11-140594 patent, Al, N, Ti and other elements are compounded, and the smelting process is easy to form AlN, TiN, etc. 2 S brittle inclusions affecting stress corrosion cracking

Method used

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  • 13Cr high anti-carbon dioxide and trace hydrogen sulfide corrosion tubing and casing steel and method for producing the same
  • 13Cr high anti-carbon dioxide and trace hydrogen sulfide corrosion tubing and casing steel and method for producing the same

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Embodiment Construction

[0031] Table 3 shows the chemical composition of the steel for oil casing of the present invention and the existing steel for oil casing, by weight percentage, wherein 1-7 are steel types of the present invention, and 8-10 are stainless steel oil casing commonly used in oilfields at present Contrasting grades of steel.

[0032] Table 3 The chemical composition of the steel for oil and casing of the present invention and the existing steel for oil and casing, wt%

[0033]

[0034] According to the chemical composition shown in Table 3, steel grades 1-7 are smelted and cast into ingots through electric furnace smelting. Before forging, warm ingots are put into the furnace, and the surface temperature of the steel ingots is less than 600°C; Annealing, the annealing temperature is controlled between 650-800°C, the annealed tube blank is heated at 1150-1250°C for 1.5-2 hours, and then pierced and hot-rolled into a blank tube; the hot-rolled steel pipe is heated at a temperature ...

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Abstract

The invention discloses a 13Cr oil bushing steel which has high resistance to carbondioxide and trace hydrogen sulfide corrosion and a manufacturing method thereof, wherein, the chemical constituents ratio according to weight percentage is as follows: C: 0.01 to 0.05 percent, Si: is less than or equal to 0.5 percent, Mn: 0.20 to 1.00 percent, Cr: 12 to 14 percent, Mo: 1.0 to 3.0 percent, Ni: 4.0 to 6.0 percent, Cu: 1.0 to 2.0 percent, Nb: 0.02 to 0.10 percent, and Fe and inevitable impurity as the rest, and the total amount of the impurity is lower than 0.05 percent. Non-API corrosion-resistant oil bushing can be obtained after electric furnace steelmaking, ingot casting, calcining, cogging, rolling, pipe-manufacturing and reasonable heat treatment. The resistance to hydrogen sulfide corrosion of the materials is obviously improved by copper-niobium alloying.

Description

technical field [0001] The invention relates to a super 13Cr stainless steel for oil casing and a manufacturing method thereof, in particular to the chemical composition of the steel for oil and gas well oil casing under the compound acid corrosion environment conditions containing high humidity carbon dioxide, chloride ion, trace hydrogen sulfide and the like. Background technique [0002] In the existing API 5CT specification, there is only one type of 13Cr stainless steel oil casing, 2Cr13, the highest product grade is 95ksi, and the highest service temperature is 120°C. In addition, the product has poor resistance to hydrogen sulfide stress corrosion cracking and is not suitable for hydrogen sulfide corrosion environments. With the deteriorating conditions of oil and gas exploitation, the well depth exceeds 5,000 meters, and the corrosive atmosphere is rich in CO 2 Oil and gas wells with hydrogen sulfide and hydrogen sulfide, and whose strength exceeds the service condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C33/04B21B37/74C21D8/10C21D1/18
Inventor 张忠铧唐豪清徐文亮
Owner BAOSHAN IRON & STEEL CO LTD
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