A method for preparing thermal recovery casing material based on strain design by adding nanometer rare earth oxide
A nano-rare earth and oxide technology is applied in the field of adding nano-rare earth oxides to prepare thermal mining casing materials based on strain design. High temperature thermal stability performance, improve thermal stability, improve the effect of strong/plastic matching
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[0030] The present invention belongs to the preparation method of materials required for casing strings for the development of unconventional oil and gas resources, and realizes innovation in terms of theoretical basis, design method, material selection basis, etc., and the specific contents include:
[0031] The invention utilizes the "oxide metallurgy" theory, adds nano rare earth oxide metamorphic inclusions, and effectively utilizes the formed composite inclusions as effective acicular ferrite nucleation cores.
[0032] (1) Basis for adding rare earth oxides
[0033] From the thermodynamic process, compared to Al 2 o 3 、TiO 2 , adding rare earth oxides (Ce 2 o 3 ) After that, rare earth composite inclusions composed of oxides, sulfides and oxysulfides with high melting point and low high-temperature plasticity are formed, which become effective acicular ferrite nucleation cores.
[0034] (2) Rare earth oxide size
[0035] The relative nucleation ability P of acicular...
Embodiment 1
[0054] (1) Melt low-alloy heat-resistant steel with Cr-Mo+microalloy components at high temperature in a vacuum induction furnace, and then add nano-rare earth oxide Ce with an average particle size of 85-100nm 2 o 3 The powder is homogenized and solid solution treated, and cast to form a steel ingot; wherein, the mass content of the nano-rare earth oxide in the steel ingot is 0.2%;
[0055] (2) Thermal processing and quenching and tempering heat treatment
[0056] The steel ingot is subjected to controlled rolling, controlled cooling and heat processing, and then subjected to quenching and tempering heat treatment to obtain a thermal mining casing material designed based on strain. Specifically, the controlled rolling reduction is 80%, the final rolling temperature is 900° C., and cooled to 750° C. at a cooling rate of 1.5° C. / s, followed by air cooling. Then quenching (1h at 980°C, oil cooling) and tempering (1h at 650°C, cooling with furnace).
Embodiment 2
[0058] (1) Melt low-alloy heat-resistant steel with Cr-Mo+microalloy components at high temperature in a vacuum induction furnace, and then add nano-rare earth oxide Ce with an average particle size of 85-100nm 2 o 3 The powder is homogenized and solid solution treated, and cast to form a steel ingot; wherein, the mass content of the nano-rare earth oxide in the steel ingot is 1%;
[0059] (2) Thermal processing and quenching and tempering heat treatment
[0060] The steel ingot is subjected to controlled rolling, controlled cooling and heat processing, and then subjected to quenching and tempering heat treatment to obtain a thermal mining casing material designed based on strain. Specifically, the controlled rolling reduction is 85%, the finish rolling temperature is 900°C, and cooled to 750°C at a cooling rate of 1.5°C / s, followed by air cooling. Then quenching (1h at 980°C, oil cooling) and tempering (1h at 650°C, cooling with furnace).
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Abstract
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