Expansion casing for heavy oil thermal recovery well and manufacturing method thereof

Abstract

The invention discloses an expansion casing for a heavy oil thermal recovery well and a manufacturing method of the expansion casing. The expansion casing comprises the chemical components of, by mass percent, 0.18-0.32 of C, 0.12-0.32 of Si, 1.1-1.7 of Mn, 0-0.005 of S, 0-0.020 of P, 0.1-0. 6 of Cr, 0.15-0.50 of Mo, 0.10-0.30 of Cu, 0.01-0.05 of Nb, 0.003-0.012 of Ce-La-Y mixed rare earth, and the balance Fe and unavoidable impurities. The manufacturing method comprises the steps of plate coil uncoiling, longitudinal shearing, edge milling, FFX molding, HFW welding, weld joint online heat treatment, weld joint inner and outer burr finishing, whole casing special heat treatment, hot straightening treatment, nondestructive inspection and thread machining. After being subjected to expansion deformation, the expansion casing has high strength, good toughness and heat stability and is suitable for the heavy oil thermal recovery well.

Description

Technical field: [0001] The invention belongs to the fields of metal materials and petroleum and natural gas industries, and in particular relates to an expansion casing for heavy oil thermal recovery wells and a manufacturing method thereof. 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. my country's heavy oil resources are mainly concentrated in Liaohe, Xinjiang, Henan, Shengli and other oil fields. At present, the domestic steam stimulation method is mainly used to exploit heavy oil reservoirs, which uses the heat of injected steam to increase the temperature of heavy oil, thereby rapidly reducing the viscosity of heavy oil and facilitating production. Due to the particularity of the drilling and production process of thermal recovery wells, the casing will be subjected to thermal expansion and constraints during the injection sta...

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Problems solved by technology

For example, Chinese patent CN 103131947B discloses a high-performance low-carbon micro-alloy steel SEW expansion sleeve and its manufacturing method. The chemical composition of the expansion sleeve is: C 0.10-0.25%, Si 0.12-0.30% , Mn 0.60~1.50%, P≤0.010%, S≤0.005%, Nb+V+Ti 0.05~0.5%, the rest is Fe and unavoidable impurities, the low-carbon microalloy steel TMCP controlled by this patent with high dimensional accuracy Hot-rolled coils are used as raw materials, and HFW welded pipes are processed by thermomechanical rolling, thermal tension reduction and special heat treatment process for the whole pipe body, so as to realize the optimization of weld seam structure and meet the relevant requirements of expansion sleeves; but due to This patent uses low-carbon micro-alloy as the casing material. After a certain amount of cold plastic deformation, the plasticity and toughness of the material are significantly reduced, especially the high-temperature strength is significantly reduced, which cannot meet the harsh environment of heavy oil thermal recovery wells.

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