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Oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil-gas wells and preparation method thereof
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An ultra-high pressure, ultra-high temperature technology, applied in the field of tubing and casing manufacturing, can solve the problems of not meeting the production requirements of three super oil and gas wells, insufficient toughness, etc., and achieve the effect of high toughness and high purity
Active Publication Date: 2020-11-10
DALIPAL PIPE
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Problems solved by technology
[0005] Aiming at the problem that the existing high-strength oil casing and casing above 150ksi steel grade has insufficient toughness and cannot meet the production requirements of three-super oil and gas wells, the invention provides an oil and casing material for ultra-deep, ultra-high pressure, and ultra-high temperature oil and gas wells and its preparation method
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Embodiment 1
[0040] The embodiment of the present invention provides a tubing and casing material for ultra-deep, ultra-high pressure, and ultra-high temperature oil and gas wells, the chemical composition of which is:
[0041] C 0.23%, Si 0.45%, Mn 0.4%, Cr 0.8%, Mo 0.91%, V 0.17%, N 0.03%, Al 0.04%, Mg 0.0025%, P 0.01%, S 0.0008%, the rest is Fe and non Avoided impurities; [Cr]+[Mo]+[V]=1.88%.
[0042] The preparation steps of the above-mentioned tubing and casing materials for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells are as follows:
[0043] The steelmaking raw materials are smelted in an electric arc furnace, ladle refining, VD vacuum degassing, and continuous casting are made into a continuous casting round billet with the same chemical composition as the above-mentioned tubing and casing; the continuous casting round billet is heated and perforated into a capillary tube by an annular furnace , The capillary tube is rolled by a three-roll continuous rolli...
Embodiment 2
[0049] The embodiment of the present invention provides a tubing and casing material for ultra-deep, ultra-high pressure, and ultra-high temperature oil and gas wells, the chemical composition of which is:
[0050] C 0.25%, Si 0.5%, Mn 0.45%, Cr 0.95%, Mo 0.84%, V 0.15%, N 0.05%, Al0.025%, Mg 0.003%, P 0.008%, S 0.0009%, the rest are Fe and non Avoided impurities; [Cr]+[Mo]+[V]=1.94%.
[0051] The preparation steps of the above-mentioned tubing and casing materials for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells are as follows:
[0052] The steelmaking raw materials are smelted in an electric arc furnace, ladle refining, VD vacuum degassing, and continuous casting are made into a continuous casting round billet with the same chemical composition as the above-mentioned tubing and casing; the continuous casting round billet is heated and perforated into a capillary tube by an annular furnace , The capillary tube is rolled by a three-roll continuous rol...
Embodiment 3
[0058] The embodiment of the present invention provides a tubing and casing material for ultra-deep, ultra-high pressure, and ultra-high temperature oil and gas wells, the chemical composition of which is:
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Abstract
The invention discloses an oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil-gas wells and a preparation method thereof. The oil casing material comprises the following components including, by weight, larger than or equal to 0.23% and smaller than or equal to 0.25% of C, larger than or equal to 0.42% and smaller than or equal to 0.5% of Si, larger than or equal to 0.4% and smaller than or equal to 0.48% of Mn, larger than or equal to 0.8% and smaller than or equal to 0.97% of Cr, larger than or equal to 0.8% and smaller than or equal to 0.96% of Mo, largerthan or equal to 0.15% and smaller than or equal to 0.19% of V, larger than or equal to 0.03% and smaller than or equal to 0.05% of N, larger than or equal to 0.015% and smaller than or equal to 0.04% of Al, larger than or equal to 0.0015% and smaller than or equal to 0.003% of Mg, larger than or equal to 0.01% of P, larger than or equal to 0.001% of S and the balance Fe and inevitable impurities, wherein the sum of [Cr], [Mo] and [V] is equal to the sum of 1.8% and (W.T.-5) / 5000*100%. The oil casing material prepared by the method can better meet the requirements of an oil casing for the three-super oil-gas wells for high strength and high toughness.
Description
Technical field [0001] The invention relates to the technical field of oil casing manufacturing, in particular to an oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells and a preparation method thereof. Background technique [0002] In recent years, with the development of my country's oil and gas exploration technology, the production depth, bottom temperature and pressure of oil and gas wells have increased significantly. Experts define ultra-deep (well depth> 6000 meters, the deepest well up to 7800m), ultra-high temperature (formation temperature> 150 ℃, up to 200 ℃), ultra-high pressure (wellheadoil pressure> 80MPa) oil and gas wells are defined as three super Oil and gas wells. At present, more and more oil and gas resources are being developed in Sanchao oil and gas wells at home and abroad. The annual growth rate of the development of deep wells above 6000 meters by PetroChina can reach about 25%. Sichuan, Tarim...
Claims
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Application Information
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