Solid expansion casing for thermal recovery well and manufacturing method of expansion casing

A technology of expanding casing and thermal recovery well, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of low high temperature strength, high strain and aging sensitivity, and reduced material plasticity and toughness, and achieves low yield strength, The effect of good weld quality and performance, low yield ratio

Inactive Publication Date: 2017-02-15
中国石油集团石油管工程技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems such as the limited plastic deformation ability of low-carbon and low-alloy casing materials in the background technology and the plastic toughness of the material is significantly reduced after a certain amount of cold deformation, the high-temperature strength is low, and the strain aging sensitivity is large. The present invention provides A preparation method of heat-resistant steel with high uniform elongation, high plasticity and low yield strength and expansion sleeve based on heat-resistant steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Mass percentage of heat-resistant steel materials for solid expandable casing of oil and gas wells: C: 0.06%, Mn: 21.5%, Cr: 5.5%, Si: 1.1%, P: 0.01%, S: 0.01%, N: 0.007%, Mo: 0.7%, Nb: 0.15%, Ti: 0.20%, B: 0.009%, and the rest is Fe.

[0055] Manufacture of solid expansion pipes for thermal recovery wells:

[0056] Firstly, hot-rolled coils are prepared: the above-mentioned steel materials (components) for thermal recovery well solid expansion casings are smelted in an alkaline electric arc furnace, and then continuously cast into slabs with a thickness of about 200 mm after AOD and vacuum degassing. The slab was subjected to homogenization annealing at 1200° C. for 2 hours. The above-mentioned thick slab is heated to 1180°C, rolling is started at 1150°C, and the final rolling temperature is 850°C for hot rolling. Hot rolling is heated to 1000°C in a continuous annealing furnace for annealing treatment. After the treatment is completed, it is rapidly cooled to 650°C ...

Embodiment 2

[0061] Mass percentage of heat-resistant steel materials for solid expansion pipes used in thermal recovery wells: C: 0.15%; Mn: 24.5%; Cr: 7.0%; Si: 0.9%; Mo: 0.95%; V: 0.30%; Nb: 0.20%; B: 0.012%; P: 0.015%; S: 0.008; N: 0.002%, the balance being Fe.

[0062] Manufacture of solid expansion pipes for thermal recovery wells:

[0063] First, steel preparation: the above-mentioned steel material (each component) for thermal recovery well solid expansion casing is smelted in an alkaline electric arc furnace, and continuously cast into a rod with a diameter of 100-250mm after AOD and vacuum degassing treatment, and the ingot is cast at 1200 ℃ for 2 hours of homogenization annealing;

[0064] Next, make seamless steel pipes: heat the above bars to 1100°C to perforate and carry out hot continuous rolling to make seamless pipe blanks. After the tube billet is solid solution treated at 1050℃×40min, its geometric dimensions are finished.

[0065] Finally, the tube blank is cut into ...

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Abstract

The invention relates to a heat-resistant steel, and heat-resistant steel based solid expandable casing for thermal production well and a manufacturing method thereof. The heat-resistant steel includes, by weight, 0.06-0.15% of C, 20-25% of Mn, 5-7% of Cr, 0.9-1.2% of Si, no more than 0.030% of P, 0.6-1.0% of Mo, S, N and Fe, no more than 0.030% of S and no more than 0.005% of N and the balance of Fe. The invention provides a heat-resistant steel with high uniform elongation, high plasticity and low yield strength and the manufacturing method of the expandable casing based on the heat-resistant steel.

Description

technical field [0001] The invention belongs to the field of materials and material preparation, and relates to a heat-resistant steel, a heat-resistant steel-based solid expansion casing for thermal recovery wells, and a manufacturing method for the expansion casing. Background technique [0002] Heavy oil is a kind of heavy crude oil with high viscosity and poor fluidity, which occupies a relatively high proportion in the world's oil and gas resources. At present, the annual output of heavy oil in my country has accounted for more than 8% of the national crude oil output. Heavy oil has high viscosity and poor fluidity at room temperature, but as the temperature rises, the viscosity of heavy oil will decrease rapidly. Studies have shown that the viscosity of heavy oil will decrease by half for every 10°C increase. Therefore, thermal oil recovery is the main means of heavy oil recovery. At present, the methods commonly used in my country for thermal recovery of heavy oil m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C21D8/10E21B29/10
Inventor 李德君刘强白强宋生印武刚吕能贾鹏军
Owner 中国石油集团石油管工程技术研究院
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