CN102409241A - Steel for oil casing pipe, oil casing pipe and manufacturing methods thereof - Google Patents
Steel for oil casing pipe, oil casing pipe and manufacturing methods thereof Download PDFInfo
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- CN102409241A CN102409241A CN2010102927682A CN201010292768A CN102409241A CN 102409241 A CN102409241 A CN 102409241A CN 2010102927682 A CN2010102927682 A CN 2010102927682A CN 201010292768 A CN201010292768 A CN 201010292768A CN 102409241 A CN102409241 A CN 102409241A
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Abstract
The invention relates to steel for an oil casing pipe. The steel comprises the following chemical components by weight percent: 0.25-0.35% of C, 0.1-0.6% of Si, 0.8-1.5% of Mn, not more than 0.015% of P, not more than 0.003% of S, 1-1.5% of Cr, 1-1.5% of Mo, 0.05-0.12% of V, 0.02-0.04% of Nb, 0.01-0.04% of Ti, 0.01-0.08% of Al, 0.0005-0.005% of Ca and the balance of Fe and inevitable impurities. A steel pipe which is obtained through smelting, continuously casting, perforating and hot-rolling by using the components is insulated for 30-60 minutes at an austenitizing temperature of 880-930 DEG C, is cooled with air to 830-850 DEG C after discharged and undergoes water quenching, undergoes high-temperature tempering at 580-620 DEG C and is insulated for 40-80 minutes to obtain the oil casing pipe. The steel grade of the obtained oil casing pipe can be above 160ksi and the impact energy is above 70J. The obtained oil casing pipe has high strength and toughness.
Description
Technical field
The present invention relates to a kind of ultrahigh-intensity high-toughness petroleum casing pipe and method of manufacture thereof, specifically, relate to above ultrahigh-intensity high-toughness petroleum casing pipe of 160ksi and method of manufacture thereof.
Background technology
Sleeve pipe is to be applicable to the indispensable special-purpose tubing of oil gas well completion operation such as deep-well, ultra deep well, go into the well and the well cementation process in, play the protection well, reinforce the borehole wall, isolated downhole oil, gas, water layer and the various bad grounds of sealing, guarantee the effect of creeping into.Following 10 years, western oil field will be one of emphasis of CNPC's exploitation.The western oil field resource is buried profound, and complex formation is generally thousands of rice, and at present deep-well has surpassed 8000m.Along with the progress of drilling technique, the pressure of the drill, rotating speed significantly improve, and it is more and more universal to strengthen drilling technology, and thermal recovery, water filling, production operation operating mode such as shake out are also harsh day by day, and required casing strength significantly improves.Receive the restriction of sleeve pipe performance and well depth structure etc., telescopic design and selection are faced with a very big difficult problem, if the selection mistake will cause serious accident.Multiple factors such as deep-well, ultra deep well telescopic are selected to consider tension, resistance to compression, anti-ly squeezed outward, overall tightness, temperature, burn into wearing and tearing, box cupling intensity are complicated system engineering.
Generally speaking, grade of steel is high more, and high strength casing is sensitivity more to surface imperfection.Along with increasing of grade of steel, YIELD STRENGTH increases, corresponding the uprising of hardness of material and toughness descends gradually, and material increases the sensitivity of surface imperfection, adds the defective of bringing in the high steel-grade bushing production process, is high steel-grade bushing potential dangerous point.Too high steel-grade bushing causes abandoned well because of poor impact toughness lost efficacy example takes place in past attempts, and like the more than one hundred million units of helical fracture direct economic loss of 150 steel-grade bushings in Ke Shen-1 well, this steel-grade bushing toughness was lower at that time according to detecting, and was approximately about 20J.Under the HS condition, H.T. can be guaranteed body opposing crackle unstable propagation in heavily stressed, microscopic defect is had the containing ability, thereby have higher safe reliability.So the design demand of superelevation steel-grade bushing is taken into account intensity and toughness, improve toughness index as far as possible satisfying the high-intensity while, improve the production safety in utilization.
JP 11-131189A proposes to be rolled in the scope more than 20% or 60% deflection then at 400-750 ℃ of scope internal heating, produces the tube product that ys 950Mpa is above, have excellent toughness.This kind technology is because Heating temperature is lower, and rolling difficulty is bigger, is difficult to mass industrialized production, and simultaneously rolling temperature is lower, is prone to produce martensitic stucture, this be the petroleum pipeline product do not allow the tissue that occurs.
JP2000-256783 discloses the petroleum casing pipe working method that has excellent toughness and anti-H 2 S stress corrosion cracking performance more than the 140ksi, and this method mainly adopts Ac
3More than carry out a tempered thermal treatment process after twice quenching again or twice modified explained hereafter goes out the tiny sleeve pipe product of grain fineness number.But the sleeve pipe product strength that this patent relates to is lower, is difficult to when reaching the above grade of steel of 160ksi, to have excellent toughness and sulfur resistance.
JP04059941A points out to control through thermal treatment process the ratio of residual austenite in the steel matrix (20%-45%) and upper bainite, and tensile strength can reach 120-160ksi.The design mix characteristics that this patent is mentioned are high-carbon and high silicon; These two kinds of compositions can significantly improve intensity but significantly reduce toughness; Residual austenite can take place to organize in the petroleum pipeline use and change (deep-well oil well pipe use temperature is more than 120 ℃) simultaneously, improves intensity and reduces toughness simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of ultrahigh-intensity high-toughness oil casing pipe steel, petroleum casing pipe and method of manufacture thereof; Especially above ultrahigh-intensity high-toughness petroleum casing pipe of a kind of 160ksi and method of manufacture thereof are to satisfy the higher combination of strength and toughness demand that the oil field proposes oil well pipe.
Thinking of the present invention is through optimization design alloying constituent, lower inclusion content and adopts specific heat treatment technology to obtain the grain structure of even refinement, can improve telescopic intensity and toughness simultaneously.In composition design, add the alloy content after optimizing, pass through add alloy solution strengthening and precipitation strength guarantee the highly malleablized cooperation of material; Refined crystalline strengthening is uniquely can improve intensity and flexible enhancement method simultaneously in the material strengthening and toughening mechanism of; Improve obdurability so obtain tiny crystal grain, and technology is simple, low being easy to simultaneously of cost implemented big production through specific thermal treatment process.
For realizing above-mentioned purpose; Oil casing pipe steel provided by the present invention; Its composition quality degree is: C:0.25-0.35%, Si:0.1-0.6%, Mn:0.8-1.5%, P≤0.015%, S≤0.003%, Cr:1-1.5%, Mo:1-1.5%, V:0.05-0.12%, Nb:0.02-0.04%, Ti:0.01-0.04%, Al:0.01-0.08%, Ca:0.0005-0.005%, surplus is Fe and unavoidable impurities.
C:C is a carbide forming element, can improve the intensity of steel, DeGrain when too low, and meeting significantly reduces the welding property of steel when too high, and control C is 0.25-0.35% among the present invention.
To improve the ys of steel, unsuitable too high, too high meeting worsens processing and toughness, is lower than 0.1% DeGrain in ferritic in the Si:Si solid solution, and control Si is 0.1-0.6% among the present invention, is preferably 0.20-0.35%.
Mn:Mn is an austenite former, can improve the hardening capacity of steel, and content is not obvious less than effect in 0.8% o'clock; Content was greater than 1.5% o'clock; With the microstructure segregation that significantly increases in the steel, influence the homogeneity and the impact property of hot rolling microstructure, control Mn is 0.8-1.5% among the present invention.
Mo: mainly be intensity and the temper resistance that improves steel through carbide and solution strengthening form, too high levels can reduce the toughness of steel, and control Mo is 1-1.5% among the present invention.
Cr: improve the hardening capacity element strongly, the strong carbide forming element, carbide precipitate improves the intensity of steel during tempering, but separates out thick M23C6 carbide during too high levels, reduces toughness, should adopt content 1-1.5% among the present invention.
V:V can crystal grain thinning, forms carbide, can significantly improve the intensity of steel, but content is when reaching a certain amount of, and its effect increase is just not obvious, and control V is 0.05-0.12% among the present invention.
Nb:Nb is thin brilliant and precipitation strength element, can remedy the decline that reduces the intensity that causes because of carbon, and content is not obvious less than effect in 0.02% o'clock, and because of it costs an arm and a leg, so want prohibitive amount, control Nb is 0.02-0.04% among the present invention.
Ti:Ti is strong carbonitride forming element, and significantly refine austenite crystal grain can remedy the decline that reduces the intensity that causes because of carbon; If content is too high; Be prone to form thick TiN, reduce material property, the weight percent content of suitable control Ti is 0.01-0.04% among the present invention.
Al: traditional deoxidation nitrogen killer, but crystal grain thinning, consider to reduce toughness, content is unsuitable too high, by weight percentage, should adopt content 0.01-0.08%.
P, S:P and S are the detrimental impurity elements in the steel, and therefore the toughness of too high levels meeting steel should reduce P, the S content in the steel as far as possible.Control P≤0.015% among the present invention, S≤0.003%.
Ca: can cleaning molten steel, impel the MnS nodularization, improve impelling strength, but be prone to form thick non-metallic inclusion during too high levels, control Ca is 0.0005-0.005% among the present invention.
In addition, the present invention also provides a kind of method of manufacture of above-mentioned oil casing pipe steel, comprises smelting, rolling, thermal treatment.
The working method of ultrahigh-intensity high-toughness petroleum casing pipe of the present invention may further comprise the steps:
At first molten steel can pass through Ca and handle after external refining and vacuum outgas.Behind the alloy melting, continuous casting becomes circle base, soaking in 1220-1260 ℃ of process furnace, piercing temperature 1200-1240 ℃, 900 ℃-950 ℃ of finishing temperatures.
Thermal treatment process:
Austenitizing temperature is 880-930 ℃ of insulation 30-60min, back air cooling to 830 ℃-850 ℃ of shrends of coming out of the stove, and in 580-620 ℃ of high tempering, soaking time 40-80min, 550-620 ℃ of hot size, the hot straightening temperature is preferably 500-550 ℃ greater than 500 ℃.
Compare with existing oil casing pipe steel, the present invention has following beneficial effect:
According to the oil casing pipe steel that composition design and processes of the present invention is made, it can be used in makes the petroleum casing pipe that the above grade of steel of 160ksi has good combination of strength and toughness; The oil casing pipe steel of making according to composition of the present invention design and ME passes through specific heat treatment technology, can crystal grain thinning, improve intensity and toughness simultaneously, and impelling strength can reach more than the 70J.
Oil casing pipe steel of the present invention meets the above grade of steel requirement of 160ksi, can be widely used in oil production; The material alloys cost that the present invention designed is low, and strength high toughness is good, can replace the low strength thick-walled tube, and energy-saving and emission-reduction have good economic benefit, and thermal treatment process is simple simultaneously, is easy to big production and implements.
Description of drawings
Fig. 1 is the grain fineness number metallograph of embodiment 5-1 steel.
Fig. 2 is the grain fineness number metallograph of embodiment 5-2 steel.
Embodiment
Carry out electrosmelting according to the chemical ingredients shown in the table 1, molten steel can pass through Ca and handle after external refining and vacuum outgas.Continuous casting becomes circle base, soaking in 1240 ℃ of ring furnaces, 1220 ℃ of piercing temperatures; 900 ℃ of finishing temperatures.
The modifier treatment austenitizing temperature is 880-930 ℃, and shrend after the listed temperature of air cooling to the table 2 of coming out of the stove in the listed temperature tempering of table 2, can obtain mechanical property as shown in table 2.
After above-mentioned processing, described ultrahigh-intensity high-toughness petroleum casing pipe intensity reaches 160ksi and more than the 170ksi, impelling strength surpasses more than the 70J.
Embodiment 5 is carried out the different heat treatment technological test; The sleeve pipe (embodiment 5-1) that adopts the resulting sleeve pipe ballistic work of conventional modified thermal treatment (embodiment 5-2) to be lower than to quench behind the above-mentioned air cooling; The approximately low 30J of ballistic work under same intensity; Fig. 1 and Fig. 2 are respectively the grain fineness number metallograph of embodiment 5-1 and 5-2, and Fig. 1 grain fineness number is rated 11 grades, and Fig. 2 grain fineness number is rated 9 grades.
Comparative Examples 6 chemical ingredientss are higher than scope of the presently claimed invention, and intensity is higher after the thermal treatment, but ballistic work is very low; Comparative Examples 7 alloy contents are lower than this patent claimed range, undercapacity, and impelling strength is better.
The chemical ingredients of table 1 embodiment of the invention and Comparative Examples, wt%
| C | Mn | Si | P | S | Cr | Mo | V | Ti | Nb | Al | Ca | |
| Embodiment 1 | 0.31 | 0.8 | 0.27 | 0.009 | 0.002 | 1 | 1 | 0.09 | 0.01 | 0.03 | 0.01 | 0.0005 |
| Embodiment 2 | 0.28 | 1 | 0.30 | 0.010 | 0.001 | 1.5 | 1.5 | 0.05 | 0.02 | 0.02 | 0.04 | 0.001 |
| Embodiment 3 | 0.25 | 1.5 | 0.35 | 0.010 | 0.003 | 1.3 | 1.3 | 0.12 | 0.04 | 0.04 | 0.05 | 0.005 |
| Embodiment 4 | 0.35 | 1.2 | 0.25 | 0.012 | 0.002 | 1.4 | 1.2 | 0.07 | 0.04 | 0.04 | 0.08 | 0.003 |
| Embodiment 5 | 0.29 | 1.1 | 0.20 | 0.013 | 0.002 | 1.1 | 1 | 0.08 | 0.03 | 0.04 | 0.02 | 0.002 |
| Comparative Examples 6 | 0.38 | 0.5 | 0.26 | 0.007 | 0.003 | 2 | 2 | 0.12 | 0.02 | 0.04 | 0.023 | 0.008 |
| Comparative Examples 7 | 0.23 | 0.7 | 0.33 | 0.008 | 0.003 | 0.5 | 0.6 | 0.04 | 0.04 | 0.002 |
The thermal treatment process of table 2 embodiment of the invention and Comparative Examples and mechanical property
It is thus clear that through the oil casing pipe steel that technology of the present invention is made, it can be used in makes the petroleum casing pipe that the above grade of steel of 160ksi has good combination of strength and toughness; Through specific thermal treatment process; Can crystal grain thinning, improve intensity and toughness simultaneously, impelling strength can reach more than the 70J.The oil casing pipe steel that obtains like this meets the above grade of steel requirement of 160ksi, can be widely used in oil production.
Claims (9)
1. oil casing pipe steel; Its chemical ingredients by weight percentage is: C:0.25-0.35%, Si:0.1-0.6%, Mn:0.8-1.5%, P≤0.015%, S≤0.003%, Cr:1-1.5%, Mo:1-1.5%, V:0.05-0.12%, Nb:0.02-0.04%, Ti:0.01-0.04%, Al:0.01-0.08%, Ca:0.0005-0.005%, surplus is Fe and unavoidable impurities.
2. oil casing pipe steel as claimed in claim 1 is characterized in that Si:0.20-0.35%.
3. according to claim 1 or claim 2 the method for manufacture of oil casing pipe steel comprises:
After molten steel is smelted, after external refining and vacuum outgas, handle through Ca; Continuous casting becomes circle base, soaking in 1220-1260 ℃ of process furnace, piercing temperature 1200-1240 ℃, 900 ℃-950 ℃ of finishing temperatures.
4. the method for manufacture of a petroleum casing pipe comprises:
The steel pipe of claim 3 is incubated 30-60min at austenitizing temperature 880-930 ℃, and back air cooling to 830 ℃-850 ℃ of shrends of coming out of the stove are in 580-620 ℃ of high tempering, soaking time 40-80min.
5. method as claimed in claim 4 is characterized in that, said steel pipe is after carrying out modified thermal treatment, and at 550-620 ℃ of hot size, the hot straightening temperature is greater than 500 ℃.
6. method as claimed in claim 5 is characterized in that, the hot straightening temperature is 500-550 ℃.
7. the oil casing pipe steel that method as claimed in claim 3 is made, it reaches more than the 160ksi grade of steel.
8. the petroleum casing pipe of making like the arbitrary described method of claim 4-6, it reaches more than the 160ksi grade of steel.
9. petroleum casing pipe as claimed in claim 8 is characterized in that, the impelling strength of said petroleum casing pipe is more than the 70J.
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| CN2010102927682A CN102409241A (en) | 2010-09-25 | 2010-09-25 | Steel for oil casing pipe, oil casing pipe and manufacturing methods thereof |
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| CN2010102927682A CN102409241A (en) | 2010-09-25 | 2010-09-25 | Steel for oil casing pipe, oil casing pipe and manufacturing methods thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6152929B1 (en) * | 2016-02-29 | 2017-06-28 | Ｊｆｅスチール株式会社 | Low alloy high strength seamless steel pipe for oil wells |
| CN107058684A (en) * | 2017-03-20 | 2017-08-18 | 天津钢管集团股份有限公司 | A kind of Technology for Heating Processing after the rolling for 12Cr1MoVG Steel Tube Specials |
| WO2017149571A1 (en) * | 2016-02-29 | 2017-09-08 | Ｊｆｅスチール株式会社 | Low-alloy, high-strength seamless steel pipe for oil well |
| CN107287499A (en) * | 2016-03-31 | 2017-10-24 | 鞍钢股份有限公司 | A kind of high temperature resistant thermal production well oil well pipe and its manufacture method |
| CN110157857A (en) * | 2019-06-03 | 2019-08-23 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum |
| CN116904859A (en) * | 2023-07-24 | 2023-10-20 | 延安嘉盛石油机械有限责任公司 | Steel pipe for petroleum well and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245437A (en) * | 2007-02-15 | 2008-08-20 | 宝山钢铁股份有限公司 | High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same |
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- 2010-09-25 CN CN2010102927682A patent/CN102409241A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245437A (en) * | 2007-02-15 | 2008-08-20 | 宝山钢铁股份有限公司 | High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6152929B1 (en) * | 2016-02-29 | 2017-06-28 | Ｊｆｅスチール株式会社 | Low alloy high strength seamless steel pipe for oil wells |
| WO2017149571A1 (en) * | 2016-02-29 | 2017-09-08 | Ｊｆｅスチール株式会社 | Low-alloy, high-strength seamless steel pipe for oil well |
| CN107287499A (en) * | 2016-03-31 | 2017-10-24 | 鞍钢股份有限公司 | A kind of high temperature resistant thermal production well oil well pipe and its manufacture method |
| CN107058684A (en) * | 2017-03-20 | 2017-08-18 | 天津钢管集团股份有限公司 | A kind of Technology for Heating Processing after the rolling for 12Cr1MoVG Steel Tube Specials |
| CN107058684B (en) * | 2017-03-20 | 2019-01-15 | 天津钢管集团股份有限公司 | It is a kind of for 12Cr1MoVG Steel Tube Special rolling after heat treatment process |
| CN110157857A (en) * | 2019-06-03 | 2019-08-23 | 无锡市前洲无缝钢管有限公司 | A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum |
| CN116904859A (en) * | 2023-07-24 | 2023-10-20 | 延安嘉盛石油机械有限责任公司 | Steel pipe for petroleum well and preparation method thereof |
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Application publication date: 20120411 |