CN117867405A - Manufacturing method of 125ksi steel-grade thick oil thermal production well steel pipe - Google Patents

Manufacturing method of 125ksi steel-grade thick oil thermal production well steel pipe Download PDF

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CN117867405A
CN117867405A CN202410082857.6A CN202410082857A CN117867405A CN 117867405 A CN117867405 A CN 117867405A CN 202410082857 A CN202410082857 A CN 202410082857A CN 117867405 A CN117867405 A CN 117867405A
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steel
steel pipe
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王建华
何航
张国胜
彭杨
李端正
程向龙
邹喜洋
卓钊
周正平
郭胜
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Hengyang Valin Steel Tube Co Ltd
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Hengyang Valin Steel Tube Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
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Abstract

The manufacturing method of the 125ksi steel grade thick oil thermal production well steel pipe comprises the following chemical components, by mass, C=0.23-0.29%, si=0.15-0.30%, mn=0.40-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr=0.80-1.20%, mo=0.40-0.60%, ti=0.01-0.03%, nb=0.035-0.05%, V is less than or equal to 0.02%, B=0.008-0.0020%, and the balance of iron and unavoidable impurities; the normal temperature yield strength of the steel pipe is more than or equal to 900Mpa, the tensile strength is more than or equal to 931Mpa, the elongation is more than or equal to 15%, the impact shear ratio is more than or equal to 75%, the high temperature yield strength at 350 ℃ is more than or equal to 862Mpa, and the high temperature yield strength at 450 ℃ is more than or equal to 793Mpa; the anti-collapse value is improved by more than 40 percent compared with the API 5C3 theoretical value.

Description

Manufacturing method of 125ksi steel-grade thick oil thermal production well steel pipe
Technical Field
The invention belongs to the technical field of steel pipe manufacturing, and relates to a manufacturing method of a 125ksi steel-grade thick oil thermal production well steel pipe.
Background
Compared with thin oil, the thick oil has high viscosity and poor fluidity, and is difficult to be mined in a conventional way. The Xinjiang, liaohe and victory oil fields in China mainly extract thick oil. In order to recover thick oil, the viscosity of the thick oil needs to be reduced, and the fluidity needs to be increased. Common thickened oil viscosity-reducing exploitation methods include thermal viscosity reduction, chemical viscosity reduction, viscosity reduction by mixing with thin oil and microbial viscosity reduction. Thermal viscosity reduction is the main stream in China, and is further divided into steam stimulation, steam flooding, gravity assisted drainage (SAGD) and in-situ combustion.
Hot steam or hot water is injected into a thick oil layer to raise the formation temperature, thereby reducing the thick oil year and increasing the thick oil fluidity, which is called steam mining technology, and is further divided into steam stimulation (CSS), steam Flooding (SF) and gravity assisted drainage (SAGD). Most of the thick oil in China adopts a steam huff and puff method, so that the safety coefficient is high, and the popularization is convenient. The in-situ combustion is carried out by injecting air or combustion improver to generate oxidation combustion reaction with stratum thick oil, heating to reduce viscosity of the thick oil, further increasing fluidity, lower cost, high risk, suitability for development of later-stage oil layer of steam exploitation, higher temperature, and environment temperature of 450-550 ℃ generally, and higher requirement for oil-gas steel tube.
In addition, with the rapid consumption of shallow thick oil exploitation, the thick oil exploitation is developed to a deep position, the deeper an oil well is, the higher the requirement on the steel grade of an oil casing pipe is, the higher the formation pressure is, the more severe the requirement on the collapse resistance of a steel pipe is, and the conventional 110ksi steel grade thermal production well steel pipe cannot meet the requirement. By adopting the steam exploitation and in-situ combustion exploitation technology, when high-temperature steam is injected or in-situ combustion is carried out, the seamless steel pipe is heated and expanded to receive great compressive stress, when oil extraction is stopped, the seamless steel pipe is cooled and receives tensile stress, and in the oil extraction process, the seamless steel pipe repeatedly receives tensile stress and compressive stress, and the requirements on high-temperature performance and anti-collapse performance are severe. Therefore, there is a need to develop a thermal production well steel pipe with higher steel grade and greater resistance to collapse.
Chinese patent CN1288071a discloses "high strength petroleum casing for super heavy oil thermal recovery well and production method thereof". The component C is as follows: 0.2 to 0.33 weight percent, si:0.23 to 0.34wt%, mn:0.8 to 1.2 weight percent, cr:0.6-1.4wt%, mo:0.10-0.26wt%, ni: less than or equal to 0.3 percent, cu: less than or equal to 0.3 percent, P: less than or equal to 0.15 percent by weight, S: less than or equal to 0.12 weight percent, and the balance being iron. The Mn, cr and Mo are adopted in the patent, the yield strength is 690-920 Mpa, the tensile strength is more than or equal to 850Mpa, the yield strength is more than or equal to 690Mpa at the temperature of 300 ℃, the collapse resistance of the pipe body is more than or equal to 43Mpa, and the performance is about 100ksi steel grade.
Chinese patent CN1391020 discloses a medium-strength petroleum casing pipe for thick oil thermal recovery well and its production method, the components are as follows: c:0.20 to 0.30 percent, si:0.15 to 0.30 percent, mn:0.6 to 1.10 percent, P: less than or equal to 0.02 percent, S less than or equal to 0.015 percent, ni: 0.30% or less, cr:0.40 to 1.20 percent, mo:0.06% -0.2%, cu: less than or equal to 0.30 percent, and the balance of iron and unavoidable impurities. The steel grade of the patent is 90ksi steel grade, the yield strength is more than or equal to 620Mpa, and the collapse resistance is more than or equal to 37Mpa at 300 ℃.
Chinese patent CN20100185465.0 discloses a "casing for thick oil thermal recovery well and production method", the components of which are: c:0.25 to 0.29 percent, si:0.17 to 0.32 percent, mn:0.9 to 1.00 percent, P: less than or equal to 0.015 percent, S less than or equal to 0.003 percent, cu: less than or equal to 0.10 percent, mo:0.35 to 0.40 percent, cr:0.95 to 1.05 percent, V: less than or equal to 0.05 percent, ni: less than or equal to 0.20 percent, al:0.015 to 0.040 percent, ti:0.010 to 0.025 percent, B: 0.0005-0.0012%, and the balance of iron and unavoidable impurities. The patent adopts CrMo steel, the yield strength after heat treatment is 758-965Mpa, the tensile strength is more than or equal to 862Mpa, the steel grade of the patent is 110ksi steel grade, and the yield strength is more than or equal to 655Mpa at the temperature of 350 ℃.
Chinese patent CN201210137336.3 discloses a method for manufacturing a casing for a thickened oil thermal recovery well, the chemical composition of which is C:0.24 to 0.30 percent, si:0.15 to 0.40 percent, mn:0.8 to 1.2 percent, cr:0.9 to 1.30 percent of Ni: less than or equal to 0.30 percent, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, and the balance of iron and unavoidable impurities. The MnCr alloy in the patent has the performance of yield strength of 758-965Mpa, tensile strength of more than or equal to 862Mpa, yield ratio of less than or equal to 0.93 and steel grade of 110ksi after tempering. The performance of the alloy is more than or equal to 855Mpa at 350 ℃ and the yield ratio is less than or equal to 0.85.
Chinese patent CN201310409200.8 discloses a "rare earth-containing heavy oil thermal recovery well professional petroleum casing pipe and its production method", its components, C:0.23 to 0.28 percent, si:0.08 to 0.28 percent, mn:0.35 to 0.65 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.006 percent, cr:1.15 to 1.35 percent, mo:0.20 to 0.30 percent, V:0.05 to 0.07 percent, B: 0.002-0.004%, rare earth Re: 0.0005-0.0100%, the balance being iron and unavoidable impurities. The patent adopts CrMo alloy, but rare earth elements are added, the yield strength is 800-900 Mpa, the tensile strength is more than or equal to 880Mpa, and the steel grade is 115ksi. The yield strength at the high temperature of 350 ℃ is more than or equal to 700mpa, the reduction amplitude of the yield strength at the temperature of 350 ℃ and the yield strength at the normal temperature is less than or equal to 20%, and the average linear thermal expansion coefficient is less than or equal to 16 multiplied by 10 -6 。
Chinese patent CN201610196966.6 discloses "an oil well pipe for high temperature resistant thermal recovery well and method for manufacturing the same", the components thereof, C:0.36 to 0.60 percent, si: 0.46 to 0.70 percent, mn:1.60 to 1.80 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.015 percent, cr:1.6 to 1.8 percent, nb:0.01 to 0.03 percent, V:0.05 to 0.07 percent, ti:0.01 to 0.03 percent, and the balance of iron and unavoidable impurities. The patent adopts MnCr alloy, the normal temperature yield strength is more than 900Mpa, and the tensile strength is as follows: 1000-1191Mpa, the steel grade of which is 125ksi. The instantaneous yield strength is 862-926Mpa at 400 ℃ and the durable yield strength is 810-842Mpa at 400 ℃ for 510 h.
Chinese patent CN201911049497.5 discloses "high temperature resistant 95ksi grade fireflood thick oil heat adoption seamless steel tube and manufacturing method", component C:0.14-0.20%, si:0.20-0.50%, mn:1.20 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, cr:0.35-0.50%, ni:0.1 to 0.20 percent, mo:0.25% -0.50%, V:0.07-0.12%, W:0.30 to 0.80 percent of Al:0.02 to 0.05 percent, ti: 0.02-0.05%, nb less than or equal to 0.05%, cu less than or equal to 0.20%, N less than or equal to 0.007%, and the balance of Fe and impurities. The patent adopts CrMoWV alloy, 95ksi steel grade, the normal temperature yield strength is more than or equal to 862Mpa, and the 450 ℃ high temperature yield strength is 655Mpa.
In the patent, the steel grade of the seamless steel pipe for the thermal production well is concentrated at 95-125ksi, the anti-collapse capacity is 34Mpa, the high-temperature strength is 350 ℃, and the seamless steel pipe is unsuitable for an environment with a requirement temperature of 450 ℃ and stronger anti-collapse capacity.
Disclosure of Invention
The invention aims to provide a manufacturing method of a 125ksi steel-grade thick oil thermal production well steel pipe, the normal-temperature yield strength of the produced steel is more than or equal to 900Mpa, the tensile strength is more than or equal to 931Mpa, the elongation is more than or equal to 15%, the impact shear ratio is more than or equal to 75%, the high-temperature yield strength at 450 ℃ is more than or equal to 793Mpa, the collapse resistance is improved by more than 40% compared with API 5C3, and the toughness is better matched. The invention is applicable to, but not limited to, thick oil steam recovery techniques and in-situ combustion recovery techniques.
The technical scheme of the invention is as follows:
the method for manufacturing the 125ksi steel-grade thick oil thermal production well steel pipe comprises the following chemical components, by mass, C=0.23-0.29%, si=0.15-0.30%, mn=0.40-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr=0.80-1.20%, mo=0.40-0.60%, V is less than or equal to 0.02%, ti=0.01-0.03%, nb=0.035-0.05%, V is less than or equal to 0.02%, B=0.008-0.0020%, and the balance is iron and unavoidable impurities, and the key process steps comprise:
(1) Smelting, namely preparing materials by using more than 50% of molten iron, scrap steel or pig iron as raw materials, adopting electric arc furnace smelting, external refining, vacuum degassing and argon blowing for more than 10 minutes, and then continuously casting to obtain a round tube blank;
(2) Hot rolling, namely heating a casting blank by an annular furnace, perforating, rolling by a PQF or MPM continuous rolling mill, and reducing the diameter to obtain a rolled seamless steel tube;
(3) Heat treatment, namely heating the seamless steel tube to 910-930 ℃ in a step quenching furnace, quenching the seamless steel tube for more than or equal to 3-5 t according to the wall thickness t of the steel tube, and cooling the seamless steel tube by adopting an internal-external + external shower and rotary water cooling mode; then the steel pipe enters a step tempering furnace, the time of quenching is more than or equal to 5 to 8t according to the wall thickness t of the steel pipe, and the tempering temperature is 600 to 630 ℃;
(4) Straightening: and carrying out hot straightening, flaw detection, water pressure and thread processing on the steel pipe after heat treatment to obtain the finished product of the steel pipe for the thermal production well.
The action principle of each chemical element in the invention is as follows:
c is an element for improving hardenability and strength economically, but is added excessively to form coarse carbides, which is disadvantageous for impact toughness, so that the content of C element is controlled within a range of 0.24% -0.29%.
Si is added to perform deoxidization and corrosion resistance improvement, but Si has poor heat conductivity and is added more, so that the impact toughness of the material is rapidly deteriorated, and Si is controlled to be 0.15-0.30%
Mn is an economic element, and proper Mn is added to realize solid solution strengthening, improve the toughness of steel and strength, but the Mn content is too high, the wear resistance and hardness can be obviously improved, and the toughness of the material is reduced more, so that the Mn is controlled to be 0.40-0.80%.
P belongs to harmful elements, is unfavorable for impact toughness, is controlled to be less than or equal to 0.020 percent as much as possible, and has better P removing effect, but P is controlled to be less than or equal to 0.020 percent in consideration of the cost and economy of steel making P removing.
S is liable to form MnS inclusions with Mn, and segregation is formed in the steel pipe, and is required to be strictly controlled.
Cr: enlarging elements in an austenite region, improving the hardenability of steel, increasing tempering temperature and increasing high-temperature strength of steel, but adding excessive elements to form C with C 23 C 6 Coarse carbides have a detrimental effect on the toughness of the material.
Mo: the steel has solid solution strengthening and precipitation strengthening effects on steel types, improves the hardenability of the steel, increases the tempering temperature of the steel, prevents tempering brittleness, and remarkably increases the high-temperature resistance of the steel, but the Mo element is expensive, and the content of the Mo element is controlled to be 0.40-0.60% in consideration of economy.
Ti and Nb belong to fine grain elements, ti (C, N) or V (C, N) is formed in the steel, austenite grain boundaries are pinned, the growth of grains at high temperature is prevented, the grains are dispersed and distributed in the steel, and the effects of preventing the growth of austenite grains and refining the grains can be achieved. The two elements have low solid solubility in steel, and can play a role of fine grain by adding trace amount.
The addition of a trace amount of B can obviously improve the hardenability of steel and save a large amount of alloy elements, but the addition of excessive B is easy to form carbide and nitride at grain boundaries, so that the impact toughness is deteriorated.
The process principle of the invention:
by adopting the steam exploitation and in-situ combustion exploitation technology, when high-temperature steam is injected or in-situ combustion is carried out, the seamless steel pipe is heated and expanded to receive great compressive stress, when oil extraction is stopped, the seamless steel pipe is cooled and receives tensile stress, and when oil extraction is carried out, the seamless steel pipe repeatedly receives tensile stress and compressive stress, and the requirements on high-temperature performance are severe. And the deeper the oil layer, the greater the formation pressure, and the higher the requirement on the anti-collapse capability of the steel pipe. The invention is applicable to, but not limited to, thick oil steam recovery techniques and in-situ combustion recovery techniques.
The invention has the beneficial effects that: the steel pipe component of the 125ksi steel-grade thick oil thermal production well is designed, is not only suitable for the thick oil exploitation of the steam thermal production well, but also suitable for the thick oil exploitation of the fire burning thermal production well, adopts CrMo alloy, cr and Mo to improve the hardenability, ensures the strength of the steel in a high-temperature environment, and adds trace B as an element for improving the hardenability and improves the tempering temperature. Meanwhile, one or more microalloying elements are added to refine grains and achieve 125ksi steel grade seamless steel pipe for thermal production well with matched toughness. The room temperature yield performance is more than 900Mpa, and the tensile strength is more than 931Mpa. The high-temperature performance is good, the high-temperature yield strength of the high-temperature impact shear strength is more than 793Mpa, the full-size 10 x 10mm sample at 0 ℃ is more than or equal to 80J in transverse impact power, more than or equal to 120J in longitudinal impact power, and more than or equal to 75% in impact shear area. The anti-collapse performance is improved by more than 40 percent compared with the theoretical value of the API 5C3 with the same specification and the same steel grade.
Drawings
FIG. 1 is a diagram of the structure of a thermal recovery well casing for producing 125ksi from example 1 after tempering.
Detailed Description
The invention is further illustrated by the following examples:
examples 1 to 5
The manufacturing method of the 125ksi steel grade seamless steel pipe for the thermal production well is used for manufacturing the steel pipe with the specification of phi 244.48 multiplied by 11.99mm. The chemical composition is shown in Table 1, and the balance is iron and unavoidable impurities. The process comprises the following steps:
(1) Smelting, namely smelting more than 50% of molten iron, scrap steel or pig iron as raw materials, proportioning, adopting an electric arc furnace to smelt, adopting an external refining process, adopting vacuum degassing to blow argon for more than 10 minutes, and then carrying out continuous casting to obtain a round tube blank.
(2) And (3) hot rolling, namely heating a casting blank by a ring furnace, perforating, rolling by a PQF or MPM continuous rolling mill, and reducing the diameter to obtain a rolled seamless steel pipe, wherein the outer diameter precision is 0 to +1% D, and the wall thickness precision is-10%t.
(3) And (3) heat treatment, namely heating the steel pipe which cannot be heated to 910-930 ℃ in a step quenching furnace, wherein the heating time of the steel pipe in the quenching furnace is 55min, and cooling by adopting an internal-external and external spraying and rotary water cooling mode. Then the steel pipe enters a step tempering furnace, the tempering temperature is 600-630 ℃, and the heating time of the steel pipe in the tempering furnace is 84min.
(4) And the rest procedures are that the heat-treated steel pipe is subjected to hot straightening, flaw detection, hydraulic pressure and thread processing to obtain the finished product of the heat production well steel pipe.
The heat treatment process parameters are shown in Table 2.
The seamless steel tube of the 125ksi steel grade thermal production well is prepared, the physical and chemical property detection results are shown in table 3, and the metallurgical structure after tempering is shown in figure 1. The normal temperature yield strength of the steel is more than or equal to 900Mpa, the tensile strength is more than or equal to 931Mpa, the elongation is more than or equal to 15%, the high temperature yield strength at 450 ℃ is more than or equal to 793Mpa, and the anti-collapse value is improved by more than 40% compared with the API 5C3 theoretical value.
The performance test method for the seamless steel pipes produced in examples 1 to 5 was as follows:
room temperature tensile test: per IOS 6892-1 or ASTM a370;
high temperature tensile test: according to ISO 6892-2 or ASTME21;
impact test (A kv/J): according to ASTM E23 or ASTM 370;
extrusion test: according to API 5C3.
Comparative example:
the comparative example adopts CMn system components, the Mo content of the comparative example is lower, from the performance, the performance of the comparative example can meet the requirement of 125 steel grade after heat treatment, but compared with the examples, the impact value of the comparative example is lower, the shearing ratio is poorer, the high-temperature tensile performance at 350 ℃ and 450 ℃ is reduced too fast, the high-temperature tensile is lower than the lower limit of 110ksi steel grade, and the requirement of 125ksi steel grade thermal production well pipe high temperature resistance key index can not be met.
TABLE 1 phi 244.48X 11.99mm chemical composition (wt%)
。
Table 2 phi 244.48X 11.99mm heat treatment process parameters
。
Table 3 results of physical and chemical Properties test of phi 244.48X 11.99mm
。

Claims (1)

1. A manufacturing method of a 125ksi steel-grade thick oil thermal production well steel pipe is characterized by comprising the following steps: the steel comprises the following chemical components, by mass, C=0.23-0.29%, si=0.15-0.30%, mn=0.40-0.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr=0.80-1.20%, mo=0.40-0.60%, V is less than or equal to 0.02%, ti=0.01-0.03%, nb=0.035-0.05%, V is less than or equal to 0.02%, B=0.008-0.0020%, and the balance of iron and unavoidable impurities; the normal temperature yield strength of the steel pipe is more than or equal to 900Mpa, the tensile strength is more than or equal to 931Mpa, the elongation is more than or equal to 15%, the impact shear ratio is more than or equal to 75%, the high temperature yield strength at 350 ℃ is more than or equal to 862Mpa, and the high temperature yield strength at 450 ℃ is more than or equal to 793Mpa; the key process steps comprise:
(1) Smelting, namely preparing materials by using more than 50% of molten iron, scrap steel or pig iron as raw materials, adopting electric arc furnace smelting, external refining, vacuum degassing and argon blowing for more than 10 minutes, and then continuously casting to obtain a round tube blank;
(2) Hot rolling, namely heating a casting blank by an annular furnace, perforating, rolling by a PQF or MPM continuous rolling mill, and reducing the diameter to obtain a rolled seamless steel tube;
(3) Heat treatment, namely heating the seamless steel tube to 910-930 ℃ in a step quenching furnace, quenching the seamless steel tube for more than or equal to 3-5 t according to the wall thickness t of the steel tube, and cooling the seamless steel tube by adopting an internal-external + external shower and rotary water cooling mode; then the steel pipe enters a step tempering furnace, the time of quenching is more than or equal to 5 to 8t according to the wall thickness t of the steel pipe, and the tempering temperature is 600 to 630 ℃;
(4) Straightening: and carrying out hot straightening, flaw detection, water pressure and thread processing on the steel pipe after heat treatment to obtain the finished product of the steel pipe for the thermal production well.
CN202410082857.6A 2024-01-19 2024-01-19 Manufacturing method of 125ksi steel-grade thick oil thermal production well steel pipe Pending CN117867405A (en)

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