Method for producing casing pipe for thickened oil thermal production well

Abstract

The invention provides a method for producing a casing pipe for a thickened oil thermal production well. The method includes the steps of steelmaking and continuous casting, pipe rolling and thermal treatment, wherein the steelmaking includes initial smelting of molten steel, deoxidization alloying and refining, and during initial smelting of the molten steel, carbon in the molten steel is not less than 0.06 wt%, phosphorus in the molten steel is not more than 0.003 wt%, and the tapping temperature is controlled within the range from 1620 DEG C to 1660 DEG C, therefore, Cr-Mn steel is obtained after continuous casting and comprises, by weight, 0.24%-0.30% of carbon, 0.15%-0.40% of silicon, 0.8%-1.2% of manganese, 0.9%-1.30% of chromium, not more than 0.30% of nickel, not more than 0.005% of phosphorus, not more than 0.005% of sulfur and the balance iron and inevitable impurities; the pipe rolling includes that the obtained steel is subjected to pipe rolling so as to obtain an expected pipe billet; and the thermal treatment includes quenching and tempering, the quenching heating temperature is controlled within the range from 870 DEG C to 890 DEG C, and the tempering heating temperature is controlled within the range from 530 DEG C to 540 DEG C, so that the casing pipe for the thickened oil thermal production well is obtained. The casing pipe produced by the method is excellent in yield strength, yield ratio, elongation coefficient, area reduction and the like.

Description

technical field [0001] The present invention generally relates to the technical field of casings for heavy oil thermal recovery wells, and more specifically, the present invention relates to a method for manufacturing casings for heavy oil thermal recovery wells. Background technique [0002] Heavy oil resources are extremely rich in the world, and its reserves far exceed the geological reserves of ordinary crude oil. According to the estimates of the US Department of Energy, the potential reserves of heavy oil in the world may be 6 times that of the proven ordinary crude oil reserves. There are also abundant heavy oil resources underground in my country. In recent years, the thermal recovery technology of heavy oil has developed rapidly, and heavy oil occupies a considerable proportion in the production composition. At present, with the deepening of the development of the petroleum industry, the exploitation of heavy oil has become one of the main measures for the stable a...

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Problems solved by technology

However, it is expected that the design concept of the casing for thermal recovery wells is based on strain design, which allows a certain plastic strain after the casing is in service, but the plastic strain generated after the casing is in service is not higher than the specified allowable strain, In addition, the fatigue life prediction of thermal cycle temperature load may cause fatigue

[0004] Due to different design concepts, the composition of steel pipes for thermal recovery wells is different. At present, oil casings for heavy oil thermal recovery wells in China mainly use Cr-Mo steel, such as TP110H (30CrMo) designed and developed by Tianjin Seamless Steel Tube Company, but its High prices add to production costs across fields

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