Steel used for solid expandable casing of oil and gas well and manufacturing method of expandable casing
A technology for expanding casing and oil and gas wells, which is applied in manufacturing tools, metal rolling, temperature control, etc., and can solve problems such as small effect sensitivity, reduced material plasticity, and low yield ratio
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Embodiment 1
[0023] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.20%, Mn: 1.75%, Si: 1.55%, Al: 0.1%, P: 0.008%, S: 0.002%, N: 0.007%, Ca : 0.004%, Nb: 0.02%, Ti: 0.03%, Cu: 0.15%, Ni: 0.18%, and the rest is Fe.
[0024] Manufacture of solid expandable casing for oil and gas wells:
[0025] Firstly, hot-rolled coils are prepared: the above-mentioned steel materials (components) for the solid expandable casing of oil and gas wells are smelted under vacuum conditions, vacuum degassed, and continuously cast to make slabs with a thickness of about 250 mm. The slab was subjected to homogenization annealing at 1200° C. for 2 hours. Then reheat to about 1200°C, rough rolling at 1050-1100°C, finish rolling at 850-900°C, cooling rate after rolling at 20-25°C / s, and coiling temperature at 580-600°C to make hot-rolled coils.
[0026]Secondly, hot-rolled coils are used to produce straight seam resistance welded steel pipes: the edge milling process is...
Embodiment 2
[0031] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.16%, Mn: 1.70%, Si: 1.23%, Al: 0.54%, P: 0.009%, S: 0.004%, N: 0.007%, Ca : 0.005%, Nb: 0.06%, V: 0.04%, Cu: 0.19%, Ni: 0.24%, Mo: 0.22%, and the rest is Fe.
[0032] Manufacture of solid expandable casing for oil and gas wells:
[0033] First, steel preparation: the above-mentioned steel material (each component) for the solid expandable casing of the oil and gas well is smelted in an oxygen-blown converter, and then cast into a rod with a diameter of 200 mm, and homogenized annealed at 1200 ° C for 2 hours;
[0034] Next, make seamless steel pipes: heat the above bars to about 1200°C, perforate them at 1100°C and carry out hot rolling, and then normalize at 960±20°C to make seamless steel pipes with a thickness of 15mm.
[0035] Then, two-stage isothermal heat treatment is carried out: the above-mentioned tube blank is isothermally treated in the austenite + ferrite (γ + α) ...
Embodiment 3
[0039] Mass percentage of steel alloy material for solid expandable casing of oil and gas well: C: 0.21%, Mn: 1.95%, Si: 1.05%, Al: 0.7%, P: 0.009%, S: 0.003%, N: 0.007%, Ca : 0.007%, Nb: 0.03%, Ti: 0.04%, Ni: 0.21%, Cu: 0.17%, Mo: 0.18%, Cr: 0.20%, and the rest Fe.
[0040] Manufacture of solid expandable casing for oil and gas wells:
[0041] First, prepare hot-rolled coils: melting under vacuum conditions, continuous casting, and continuous casting into slabs with a thickness of about 250mm. Rough rolling at 800°C, finish rolling at 800°C, cooling rate after rolling at 23°C / s, coiling temperature at 530°C, to make hot-rolled coils with a thickness of 10mm.
[0042] Secondly, hot-rolled coils are used to produce straight seam resistance welded steel pipes: the edge milling process is used to precisely control the width of the strip steel, and the two plate edges are parallel to each other; the wave shape of the plate edge is controlled, and the roll forming process is adopt...
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