CN111910130A - Oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells and preparation method thereof - Google Patents
Oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an oil casing material for an ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well and a preparation method thereof, wherein the oil casing material comprises the following components in percentage by weight: c is more than or equal to 0.23 percent and less than or equal to 0.25 percent, Si is more than or equal to 0.5 percent and less than or equal to 0.5 percent, Mn is more than or equal to 0.4 percent and less than or equal to 0.48 percent, Cr is more than or equal to 0.8 percent and less than or equal to 0.97 percent, Mo is more than or equal to 0.8 percent and less than or equal to 0.96 percent, V is more than or equal to 0.15 percent and less than or equal to 0.19 percent, N is more than or equal to 0.03 percent and less than or equal to 0.05 percent, Al is more than or equal to 0.015 percent and less than or equal to 0.04 percent, Mg is more than or equal to 0.0015 percent and less than or equal to 0.003 percent, P is less than or equal to 0.01 percent. The oil casing material prepared by the invention can better meet the requirements of the oil casing for the three-super oil-gas well on high strength and high toughness.
Description
Technical Field
The invention relates to the technical field of oil casing pipe manufacturing, in particular to an oil casing pipe material for an ultra-deep, ultra-high pressure and ultra-high temperature oil-gas well and a preparation method thereof.
Background
In recent years, with the development of oil-gas exploration technology in China, the exploitation well depth, the bottom temperature and the pressure of an oil-gas well are obviously improved. The experts define the ultra-deep (well depth is more than 6000 meters, the deepest well can reach 7800m), ultra-high temperature (formation temperature is more than 150 ℃, and the highest temperature can reach 200 ℃), and ultra-high pressure (well mouth oil pressure is more than 80MPa) oil and gas wells as the three ultra-deep oil and gas wells. At present, oil and gas resources of three-super oil and gas wells are developed more and more at home and abroad, and the development year of deep wells with medium petroleum of more than 6000 m can be increased by about 25 percent. Basins such as Sichuan and Tarim contain rich petroleum and natural gas resources, wherein the natural gas exploitation amount of a block in front of a truck mountain of a Tarim oil depot exceeds billion cubic meters, but the block is extremely complex in geological structure and is a typical three-super gas reservoir, so that the demand for high-strength and high-toughness oil casings is increased in the future.
In a three-super oil-gas well, an oil sleeve not only bears the action of various external static loads such as axial tension, compression, internal and external pressure, high temperature, bending moment, shearing force and the like, but also induces the vibration of the oil sleeve by the instant flow coupling of high-speed gas in the process of exploitation, so that the oil sleeve bears the action of alternating dynamic loads, is in a more severe dynamic environment and is very easy to lose efficacy. According to the industry guide standard, the first choice of the three-super oil-gas well is the ultrahigh-strength and high-toughness oil casing with the yield strength of more than 1000MPa and the toughness index of 10 percent.
In order to meet the use requirements of the three-super oil-gas well, improve the oil-gas exploitation safety of the three-super oil-gas well, and develop a high-strength high-toughness oil casing product, the development method becomes a new research hotspot. In recent years, oil well pipe products with high strength and high toughness are developed by various manufacturers at home and abroad. Among them, V & M company in germany developed a series of high toughness products for high toughness requirements in the field of talimu, wherein VM140HC has a transverse impact toughness of up to 110J. Tenaris also developed a 110-grade 150ksi steel high strength casing product with TN140DW impact assurance values above 70J. However, the oil casing with higher strength of above 150ksi steel grade generally has the problems of insufficient toughness and low use safety factor, and can not meet the requirement of safe exploitation of three-super oil and gas wells. The TN150DW transverse impact toughness guarantee value of TENARIS is only 34J, and the requirement of 10% yield strength of toughness cannot be met.
Disclosure of Invention
Aiming at the problems that the existing 150ksi steel grade or higher high-strength oil casing has insufficient toughness and cannot meet the exploitation requirements of three-super oil and gas wells, the invention provides an oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells and a preparation method thereof.
In order to solve the technical problem, the embodiment of the invention provides the following technical scheme:
an oil casing material for ultra-deep, ultra-high pressure and ultra-high temperature oil and gas wells comprises the following components in percentage by weight: c is more than or equal to 0.23 percent and less than or equal to 0.25 percent, Si is more than or equal to 0.5 percent and less than or equal to 0.5 percent, Mn is more than or equal to 0.48 percent and less than or equal to 0.48 percent, Cr is more than or equal to 0.8 percent and less than or equal to 0.97 percent, Mo is more than or equal to 0.8 percent and less than or equal to 0.96 percent, V is more than or equal to 0.15 percent and less than or equal to 0.19 percent, N is more than or equal to 0.03 percent and less than or equal to 0.05 percent, Al is more than or equal to 0.015 percent and less than or equal to 0.04 percent, Mg is more than;
and the weight percentages of the contents of Cr, Mo and V in the oil casing material and the wall thickness of the oil casing material accord with the following relational expression: [ Cr ] + [ Mo ] + [ V ] - [ 1.8% + (W.T. -5)/5000 × 100%, wherein [ Cr ] represents the weight percentage of the Cr content in the oil jacket material, [ Mo ] represents the weight percentage of the Mo content in the oil jacket material, [ V ] represents the weight percentage of the V content in the oil jacket material, and W.T. is the wall thickness of the oil jacket material in mm.
In the component design of the invention, Cr, Mo, V and C are added on the basis of C-Mn steel to form carbide precipitation so as to improve the strength of the steel; by accurately controlling the addition of N, the steel has two forms of combined N and free N, wherein a part of N and alloy elements form nitrides, the precipitation strengthening effect of Cr, Mo and V is improved, and the strength of the steel is further improved; meanwhile, due to the fact that the alloy content is high, precipitates are easy to aggregate, precipitate and grow up, free N in steel can reduce the dissolution of alloy carbonitride in high-temperature austenite, the growth of alloy carbonitride grains is hindered, grain refinement is facilitated, and the adverse effect of high alloy content is eliminated; mg is added to improve the size and distribution of inclusions in steel, so that the particles of the inclusions in the steel are fine and uniform, meanwhile, Mg can also combine with part of S, the adverse effect of MnS inclusions on the performance of the steel is reduced, and the toughness of the steel is improved; in addition, the content of Cr, Mo and V alloy is accurately controlled according to the wall thickness of the steel pipe, so that the uniformity of the structure transformation in the wall thickness direction and the length direction of the steel during quenching can be ensured, and the stability and the uniformity of the product performance are improved.
The components are matched with each other in a specific proportion, so that the prepared oil casing material can better meet the requirements of the oil casing for the three-super oil-gas well on high strength and high toughness, the yield strength of the oil casing material at 200 ℃ can reach 1069-.
The invention also provides a preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, which comprises the following steps:
using scrap steel as a raw material, and carrying out electric arc furnace smelting, ladle refining, VD vacuum refining and continuous casting processes to obtain a continuous casting round billet with the same chemical composition as the oil sleeve material;
heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary to obtain a pierced billet, and cooling the pierced billet by a micro-tension reducing and stepping cooling bed to obtain a seamless steel pipe;
and carrying out heat treatment on the seamless steel pipe to obtain the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well.
The preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, provided by the invention, has a simple preparation process and is easy to produce and practice.
Preferably, the ladle pre-deoxidation and alloying process is completed in the tapping process of the electric arc furnace, FeCr, FeMo, FeV, MnSi and aluminum ingots are added for deoxidation alloying when the tapping reaches 1/3, and then lime, fluorite and pre-melting refining slag are added for slagging.
Alloy is added for deoxidation alloying when the steel is tapped to 1/3, and slagging is carried out after the deoxidation alloying is finished, which is beneficial to reducing the quantity of inclusions in molten steel and improving the purity of finished molten steel.
Preferably, in the ladle refining process, the weight percentages of the components of the refining slag are controlled in the following ranges: 45 percent of<CaO<55％、10％<CaF2<15％、5％<MgO<10％、20％<Al2O3<25％、SiO2<5% and the weight percentage of CaO and Al2O3The weight percentage of the components accords with the following relational expression: 1.2<[CaO]/[Al2O3]<1.5, wherein [ CaO ]]Represents the weight percentage of CaO content in the refining slag, [ Al ]2O3]Indicates Al in the refining slag2O3The weight percentage of the content.
Mg added in the invention can react with Al2O3The preferred refining slag has good capability of adsorbing magnesium aluminate spinel inclusions and good desulfurization capability, and can effectively improve the quantity, form and size of inclusions in steel, improve the purity of molten steel and further improve the toughness of oil casing materials.
Preferably, in the ladle refining process, calcium carbide and aluminum particles with the mass ratio of (2.5-3.5):1 are added into the ladle to deoxidize and form white slag.
The preferable proportion of the deoxidizer can ensure the stability of slag system components in the refining process.
Preferably, in the ladle refining process, when the sulfur content in the molten steel is reduced to below 0.001 wt%, 0.1-0.2kg/t of magnesium cored wire is fed at a speed of 2-5 m/s.
Mg has excellent deoxidation and desulfurization functions, and can reduce the content of sulfur and oxygen in molten steel so as to reduce the number of inclusions; mg is easy to gasify and volatilize after being added into molten steel, and Mg steam is beneficial to floating and discharging inclusion; in addition, Mg and Al2O3Forming magnesium aluminate spinel inclusions to provide more uniformNucleation is beneficial to forming spinel inclusions with smaller size and uniform distribution. After the molten steel is treated by the magnesium, the method is beneficial to refining the steel structure, and further beneficial to improving the toughness of the steel pipe.
Preferably, the heat treatment process comprises the steps of: heating the seamless steel pipe to 880-containing 910 ℃ and preserving heat, cooling by water, heating the steel pipe to 800-containing 820 ℃ and preserving heat, cooling by water, heating to 600-containing 680 ℃ and preserving heat, and cooling by air.
Preferably, in the heat treatment process, the heat preservation time of the seamless steel tube at 880-910 ℃ is 5-8min, the heat preservation time at 800-820 ℃ is 5-8min, and the heat preservation time at 600-680 ℃ is 15-20 min.
The preferred heat treatment process in the present invention is advantageous in obtaining a large amount of ferrite structure, making the volume fraction of ferrite 5-20%, significantly improving the toughness of the steel pipe, and minimizing the oxidation degree of the steel pipe surface.
Preferably, in the heat treatment process, the quenching adopts a mode of internal spraying and external spraying, and the flow rate of the internal spraying is
W.t. is the wall thickness of the tube in mm and D is the outer diameter of the tube in mm.
Preferably, the flow rate of the outer shower is 1000-3/h。
Preferably, in the heat treatment step, the quenching time is 0.18 × W.T.1.8s, W.T. is the wall thickness of the tube in mm; the water temperature for quenching is 20-30 ℃.
The internal water spraying flow and the quenching time are determined according to the specification of the steel pipe, the internal water spraying flow and the quenching time are accurately controlled, and the uniformity of the structure transformation of the steel pipe in the length direction and the thickness direction during quenching is ensured.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the invention, precise chemical composition design and a unique preparation process are adopted to be matched, so that the purity of molten steel is high, the inclusions are fine and are dispersed, the average size of the inclusions is about 3 mu m, and the prepared oil sleeve material has ultrahigh strength under a high-temperature condition and high toughness matched with the ultrahigh strength.
Drawings
FIG. 1 is a graph showing a distribution of yield strength at 200 ℃ of an oil casing material for an ultra-deep, ultra-high pressure, ultra-high temperature oil and gas well, prepared according to an embodiment of the present invention;
FIG. 2 is a distribution diagram of tensile strength of an oil casing material for an ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, which is prepared by an embodiment of the invention, at a temperature of 200 ℃;
FIG. 3 is an impact power distribution diagram of an oil casing material for an ultra-deep, ultra-high pressure, ultra-high temperature oil and gas well, prepared according to an embodiment of the present invention, at 0 ℃;
FIG. 4 is a diagram showing the size distribution of inclusions in an oil casing material for an ultra-deep, ultra-high pressure, ultra-high temperature oil and gas well, prepared according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Example 1
The embodiment of the invention provides an oil casing material for an ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, which comprises the following chemical components:
0.23% of C, 0.45% of Si, 0.4% of Mn, 0.8% of Cr, 0.91% of Mo, 0.17% of V, 0.03% of N, 0.04% of Al, 0.0025% of Mg, 0.01% of P, 0.0008% of S, and the balance of Fe and inevitable impurities; [ Cr ] + [ Mo ] + [ V ] ═ 1.88%.
The preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well comprises the following steps:
smelting a steel-making raw material in an electric arc furnace, refining a steel ladle, carrying out VD vacuum degassing and continuously casting to prepare a continuous casting round billet with the same chemical composition as the oil sleeve; heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary by a three-roll continuous rolling mill to obtain a pierced billet, removing the pierced billet by a three-stand pipe removing machine, reducing the diameter by micro tension, and cooling by a stepping cooling bed to prepare a rolled steel pipe with the diameter of 139.7mm multiplied by 9.17 mm; the rolled steel pipe is subjected to heat treatment to obtain the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil-gas well. The structure of the oil casing material is mainly tempered sorbite and ferrite.
The steel ladle pre-deoxidation and alloying working procedure is completed in the tapping process of an electric arc furnace, FeCr, FeMo, FeV, MnSi and aluminum ingots are added for deoxidation alloying when the tapping reaches 1/3 after the smelting working procedure of the electric arc furnace is finished, and then lime, fluorite and pre-melting refining slag are added for slagging.
In the ladle refining process, the weight percentages of the components of the refining slag are controlled in the following ranges: 45 percent of<CaO<55％、10％<CaF2<15％、5％<MgO<10％、20％<Al2O3<25％、SiO2<5% and the weight percentage of CaO and Al2O3The weight percentage of the components accords with the following relational expression: 1.2<[CaO]/[Al2O3]<1.5。
In the ladle refining procedure, calcium carbide and aluminum particles with the mass ratio of 3:1 are added into a ladle to be deoxidized to form white slag; when the sulfur content in the molten steel is reduced to below 0.001 wt%, 0.1kg/t of magnesium cored wire is fed at a speed of 5 m/s.
The heat treatment process comprises the following steps: heating the seamless steel tube to 880 ℃, preserving heat for 8min, and then cooling by water; and then heating the seamless steel pipe to 800 ℃ and preserving heat for 8min, cooling by water, heating the seamless steel pipe to 600 ℃ and preserving heat for 20min, and cooling by air. Quenching adopts a mode of internal spraying and external spraying, and the flow rate of the internal spraying is 417m3H; the quenching time is 10 s; the quenching water temperature is 20-30 ℃, and the flow of the outer drenching water is 2000m3/h。
Example 2
The embodiment of the invention provides an oil casing material for an ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, which comprises the following chemical components:
0.25% of C, 0.5% of Si, 0.45% of Mn, 0.95% of Cr, 0.84% of Mo, 0.15% of V, 0.05% of N, 0.025% of Al, 0.003% of Mg, 0.008% of P, 0.0009% of S, and the balance of Fe and inevitable impurities; [ Cr ] + [ Mo ] + [ V ] ═ 1.94%.
The preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well comprises the following steps:
smelting a steel-making raw material in an electric arc furnace, refining a steel ladle, carrying out VD vacuum degassing and continuously casting to prepare a continuous casting round billet with the same chemical composition as the oil sleeve; heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary by a three-roll continuous rolling mill to obtain a pierced billet, removing the pierced billet by a three-stand pipe removing machine, reducing the diameter by micro tension, and cooling by a stepping cooling bed to prepare a seamless steel pipe with the diameter of 244.5mm multiplied by 11.99 mm; the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well is obtained by heat treatment of the seamless steel pipe. The structure of the oil casing material is mainly tempered sorbite and ferrite.
The steel ladle pre-deoxidation and alloying working procedure is completed in the tapping process of an electric arc furnace, FeCr, FeMo, FeV, MnSi and aluminum ingots are added for deoxidation alloying when the tapping reaches 1/3 after the smelting working procedure of the electric arc furnace is finished, and then lime, fluorite and pre-melting refining slag are added for slagging.
In the ladle refining process, the weight percentages of the components of the refining slag are controlled in the following ranges: 45 percent of<CaO<55％、10％<CaF2<15％、5％<MgO<10％、20％<Al2O3<25％、SiO2<5% and the weight percentage of CaO and Al2O3The weight percentage of the components accords with the following relational expression: 1.2<[CaO]/[Al2O3]<1.5。
In the ladle refining procedure, calcium carbide and aluminum particles with the mass ratio of 2.5:1 are added into a ladle to be deoxidized to form white slag; when the sulfur content in the molten steel is reduced to below 0.001 wt%, 0.15kg/t of magnesium cored wire is fed at the speed of 3.5 m/s.
The heat treatment process comprises the following steps: heating the seamless steel tube to 900 ℃, preserving heat for 6min, and then cooling by water; and then heating the seamless steel pipe to 810 ℃, preserving heat for 6min, cooling by water, heating the seamless steel pipe to 680 ℃, preserving heat for 15min, and cooling by air. Quenching adopts a mode of internal spraying and external spraying, and the flow rate of the internal spraying is 1375m3H; the quenching time is 16 s; quenching waterThe temperature is 20-30 ℃, and the flow of the outer drenching water is 1000m3/h。
Example 3
The embodiment of the invention provides an oil casing material for an ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, which comprises the following chemical components:
0.24% of C, 0.42% of Si, 0.48% of Mn, 0.97% of Cr, 0.96% of Mo, 0.19% of V, 0.04% of N, 0.015% of Al, 0.0015% of Mg, 0.007% of P, 0.001% of S, and the balance of Fe and inevitable impurities; [ Cr ] + [ Mo ] + [ V ] - [ 2.12%.
The preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well comprises the following steps:
smelting a steel-making raw material in an electric arc furnace, refining a steel ladle, carrying out VD vacuum degassing and continuously casting to prepare a continuous casting round billet with the same chemical composition as the oil sleeve; heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary by a three-roll continuous rolling mill to obtain a pierced billet, removing the pierced billet by a three-frame pipe removing machine, reducing the diameter by micro-tension, and cooling by a stepping cooling bed to prepare a seamless steel pipe with the diameter of 269.9mm multiplied by 21 mm; the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well is obtained by heat treatment of the seamless steel pipe. The structure of the oil casing material is mainly tempered sorbite and ferrite.
The steel ladle pre-deoxidation and alloying working procedure is completed in the tapping process of an electric arc furnace, FeCr, FeMo, FeV, MnSi and aluminum ingots are added for deoxidation alloying when the tapping reaches 1/3 after the smelting working procedure of the electric arc furnace is finished, and then lime, fluorite and pre-melting refining slag are added for slagging.
In the ladle refining process, the weight percentages of the components of the refining slag are controlled in the following ranges: 45 percent of<CaO<55％、10％<CaF2<15％、5％<MgO<10％、20％<Al2O3<25％、SiO2<5% and the weight percentage of CaO and Al2O3The weight percentage of the components accords with the following relational expression: 1.2<[CaO]/[Al2O3]<1.5。
In the ladle refining procedure, calcium carbide and aluminum particles with the mass ratio of 3.5:1 are added into a ladle to be deoxidized to form white slag; when the sulfur content in the molten steel is reduced to below 0.001 wt%, 0.2kg/t of magnesium cored wire is fed at the speed of 2 m/s.
The heat treatment process comprises the following steps: heating the seamless steel tube to 910 ℃ and preserving heat for 5min, and then cooling by water; and then heating the seamless steel pipe to 820 ℃ and preserving heat for 5min, cooling by water, heating the seamless steel pipe to 650 ℃ and preserving heat for 18min, and cooling by air. Quenching adopts a mode of internal spraying and external spraying, and the flow rate of the internal spraying is 1469m3H; the quenching time is 43 s; the quenching water temperature is 20-30 ℃, and the flow of the outer drenching water is 3000m3/h。
The yield strength, tensile strength and transverse impact energy of the oil jacket materials prepared in examples 1 to 3 were analyzed by arbitrary sampling according to the requirements of API 5CT standard version 10, and the results of statistical analysis thereof are shown in fig. 1 to 3. The number of samples in the figure is the number of prepared oil jacket materials taken, and random sampling is adopted.
As can be seen from the figure, the 200 ℃ yield strength of the oil bushing material prepared by the method is 1090-1147MPa, the tensile strength is 1200-1250MPa, and the 0 ℃ transverse full-size Charpy impact energy is 112-136J. Wherein the average value of the yield strength is 1108.2MPa, and the standard deviation is 15.3 MPa; the average value of the tensile strength is 1216.0MPa, and the standard deviation is 10.7 MPa; the average value of the transverse full-size Charpy impact energy at 0 ℃ is 118.8J, and the standard deviation is 5.4J. The elongation of the material is 17-19%, the average value is 18.1%, and the standard deviation is 0.8%.
The oil jacket materials prepared in examples 1 to 3 were subjected to rough grinding, finish grinding and polishing, and then the inclusions in the samples were automatically detected using an electron scanning electron microscope and oxford INCA software, and the number and equivalent diameter of the inclusions larger than 1 μm were analyzed, and the results are shown in fig. 4. As can be seen from the figure, the equivalent diameters of the inclusions are less than 10 μm, the average size is 3.2 μm, the inclusions are fine and are distributed in a dispersing way, and the toughness of the oil casing material is favorably improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well is characterized by comprising the following components in percentage by weight: c is more than or equal to 0.23 percent and less than or equal to 0.25 percent, Si is more than or equal to 0.5 percent and less than or equal to 0.5 percent, Mn is more than or equal to 0.48 percent and less than or equal to 0.48 percent, Cr is more than or equal to 0.8 percent and less than or equal to 0.97 percent, Mo is more than or equal to 0.8 percent and less than or equal to 0.96 percent, V is more than or equal to 0.15 percent and less than or equal to 0.19 percent, N is more than or equal to 0.03 percent and less than or equal to 0.05 percent, Al is more than or equal to 0.015 percent and less than or equal to 0.04 percent, Mg is more than;
and the weight percentages of the contents of Cr, Mo and V in the oil casing material and the wall thickness of the oil casing material accord with the following relational expression: [ Cr ] + [ Mo ] + [ V ] - [ 1.8% + (W.T. -5)/5000 × 100%, wherein [ Cr ] represents the weight percentage of the Cr content in the oil jacket material, [ Mo ] represents the weight percentage of the Mo content in the oil jacket material, [ V ] represents the weight percentage of the V content in the oil jacket material, and W.T. is the wall thickness of the oil jacket material in mm.
2. The preparation method of the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well, according to claim 1, is characterized by comprising the following steps:
carrying out electric arc furnace smelting, ladle refining, VD vacuum refining and continuous casting on a steelmaking raw material to obtain a continuous casting round billet with the same chemical composition as the oil sleeve material;
heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary to obtain a pierced billet, and cooling the pierced billet by a micro-tension reducing and stepping cooling bed to obtain a seamless steel pipe;
and carrying out heat treatment on the seamless steel pipe to obtain the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well.
3. The method for preparing an oil jacket material for an ultra-deep, ultra-high pressure, ultra-high temperature oil and gas well as claimed in claim 2, wherein the ladle pre-deoxidation and alloying process is performed during tapping of the electric arc furnace, and FeCr, FeMo, FeV, MnSi and aluminum ingots are added to perform deoxidation alloying when tapping reaches 1/3, and then lime, fluorite and pre-melted refining slag are added to perform slagging.
4. The method for preparing the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well as defined in claim 2, wherein in the ladle refining process, the weight percentages of the components of the refining slag are controlled in the following ranges: 45 percent of<CaO<55％、10％<CaF2<15％、5％<MgO<10％、20％<Al2O3<25％、SiO2<5% and the weight percentage of CaO and Al2O3The weight percentage of the components accords with the following relational expression: 1.2<[CaO]/[Al2O3]<1.5。
5. The method for preparing the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well as defined in claim 2, wherein in the ladle refining process, calcium carbide and aluminum particles with the mass ratio of 2.5-3.5:1 are added into a ladle to be deoxidized to form white slag.
6. The method for preparing an oil casing material for an ultra-deep, ultra-high pressure, ultra-high temperature oil and gas well as defined in claim 5, wherein in the ladle refining process, when the sulfur content in the molten steel is reduced to less than 0.001 wt%, 0.1-0.2kg/t of magnesium cored wire is fed at a speed of 2-5 m/s.
7. The method for preparing the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well according to claim 2, wherein the heat treatment process comprises the following steps: heating the seamless steel pipe to 880-containing 910 ℃ and preserving heat, cooling by water, heating the steel pipe to 800-containing 820 ℃ and preserving heat, cooling by water, heating to 600-containing 680 ℃ and preserving heat, and cooling by air.
8. The method for preparing the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well as defined in claim 7, wherein in the heat treatment process, the heat preservation time of the seamless steel tube at 880-910 ℃ is 5-8min, the heat preservation time at 800-820 ℃ is 5-8min, and the heat preservation time at 600-680 ℃ is 15-20 min.
9. The method for preparing the oil casing material for the ultra-deep, ultra-high pressure and ultra-high temperature oil and gas well as defined in claim 7, wherein in the heat treatment process, the quenching process adopts a mode of internal spraying and external spraying for water cooling, and the flow rate of the internal spraying is
W.t. is the wall thickness of the tube in mm and D is the outer diameter of the tube in mm.
10. The method for preparing an oil casing material for ultra-deep, ultra-high pressure, ultra-high temperature oil and gas wells according to claim 9, wherein in the heat treatment process, the quenching time is 0.18 x W.T.1.8s, W.T. is the wall thickness of the tube in mm; the water temperature for quenching is 20-30 ℃.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191656A (en) * | 2016-08-17 | 2016-12-07 | 衡阳华菱连轧管有限公司 | A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application |
| CN109082591A (en) * | 2018-08-22 | 2018-12-25 | 东北大学 | The high-strength oil annular tube steel of 125ksi anti-H 2 S stress corrosion and its preparation process |
| CN109385576A (en) * | 2017-08-04 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing |
| WO2019188740A1 (en) * | 2018-03-26 | 2019-10-03 | 日本製鉄株式会社 | Steel material suitable for use in acidic environments |
| JP2020001067A (en) * | 2018-06-28 | 2020-01-09 | 日鉄ステンレス株式会社 | Welding wire for ferritic stainless steel, fillet welding method and production method of automotive exhaust part |
| CN110760754A (en) * | 2019-10-31 | 2020-02-07 | 达力普石油专用管有限公司 | 110KSI heat-resistant petroleum casing pipe and manufacturing method thereof |
-
2020
- 2020-08-18 CN CN202010831286.3A patent/CN111910130B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191656A (en) * | 2016-08-17 | 2016-12-07 | 衡阳华菱连轧管有限公司 | A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application |
| CN109385576A (en) * | 2017-08-04 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing |
| WO2019188740A1 (en) * | 2018-03-26 | 2019-10-03 | 日本製鉄株式会社 | Steel material suitable for use in acidic environments |
| JP2020001067A (en) * | 2018-06-28 | 2020-01-09 | 日鉄ステンレス株式会社 | Welding wire for ferritic stainless steel, fillet welding method and production method of automotive exhaust part |
| CN109082591A (en) * | 2018-08-22 | 2018-12-25 | 东北大学 | The high-strength oil annular tube steel of 125ksi anti-H 2 S stress corrosion and its preparation process |
| CN110760754A (en) * | 2019-10-31 | 2020-02-07 | 达力普石油专用管有限公司 | 110KSI heat-resistant petroleum casing pipe and manufacturing method thereof |
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