CN103451543A - Oil casing for ultra-deep well and production technology thereof - Google Patents
Oil casing for ultra-deep well and production technology thereof Download PDFInfo
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- CN103451543A CN103451543A CN2013104092667A CN201310409266A CN103451543A CN 103451543 A CN103451543 A CN 103451543A CN 2013104092667 A CN2013104092667 A CN 2013104092667A CN 201310409266 A CN201310409266 A CN 201310409266A CN 103451543 A CN103451543 A CN 103451543A
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Abstract
The invention relates to an oil casing for an ultra-deep well and a production technology thereof. The material of the oil casing comprises the following chemical components in percentage by mass: 0.18-0.24% of C, 0.18-0.30% of Si, 0.50-0.70% of Mn, 0.85-1.15% of Cr, 0.65-0.75% of Mo, 0.02-0.05% of Ce, 0.001-0.005% of B, 0.09-0.13% of V, less than or equal to 0.030% of N, 0.01-0.05% of Altot, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.001% of O and the balance of Fe and unavoidable impurities based on the total percentage 100% by mass. In the technology, thermal treatment is implemented by quenching and tempering processes, the quenching heating temperature is 910+/-10 DEG C, the thermal insulation time is not less than 1.5 minutes for every 1mm of wall thickness, and the total thermal insulation time is not less than 30 minutes; the tempering temperature is 640+/-10 DEG C, and the thermal insulation time is not less than 1 hour; then the product stands in air for cooling. The oil casing and the production technology thereof provided by the invention have the advantages that the Cr and Mo are used as main alloying elements which are supplemented by the V and B microalloy elements and added with Ce, good strength and hardness and fine grain size after steel quenching are guaranteed, and uniform structure and good all-direction impact toughness are realized after tempering.
Description
Technical field
The present invention relates to petroleum casing pipe and production technique thereof for a kind of ultra deep well, belong to the metallurgical material field.
Background technology
Due to the sustainable development of world economy, the mankind increase day by day to the demand of oil and gas, make crude oil price high, so oil company is severe to environment, complex geologic conditions, the exploitation of burying dark Deep Oil And Gas Exploration drop into more and more and pay attention to.Along with the exploratory development to ultra deep well, complex geologic conditions oil and gas, also more and more special and harsh to the requirement of the petroleum casing pipe that plays a crucial role in drilling well.Be subject to the restriction of sleeve pipe performance and well depth structure etc., the design of sleeve pipe and selection are faced with a very large difficult problem, if the selection mistake will cause serious accident.The many factors such as the selection of ultra deep well sleeve pipe will be considered tension, resistance to compression, anti-ly squeezes outward, overall tightness, temperature, burn into wearing and tearing, box cupling intensity, be the systems engineering of a complexity, is also one of current problem demanding prompt solution.At present, the transverse impact toughness of the ultra deep well petroleum casing pipe of domestic production generally is difficult to reach related request.Patent " 150ksi grade of steel high-strength for toughness oil and gas well borehole operation steel pipe and production method thereof " and " oil and gas exploitation middle-deep well, ultra deep well petroleum casing pipe and production method thereof " have been invented deep-well, ultra deep well petroleum casing pipe, but the transverse impact toughness aspect is not paid close attention to especially.Rare earth steel is the characteristic brand product of BAOGANG GROUP, after adding rare earth in steel, generally can make the transverse impact toughness of weldless steel tube, corrosion resistance nature significantly improve, and improves other performances simultaneously.
Summary of the invention
Based on above background technology, the purpose of this invention is to provide and a kind ofly there is high-yield strength, good impelling strength and than petroleum casing pipe and production technique thereof for the ultra deep well of high collapse-resistance intensity.
For achieving the above object, the present invention is achieved by the following measures:
A kind of ultra deep well petroleum casing pipe, is characterized in that, the mass percent chemical composition of constituent material is: C 0.18～0.24; Si 0.18～0.30; Mn 0.50～0.70; Cr 0.85～1.15; Mo 0.65～0.75; Ce 0.02～0.05; B 0.001～0.005; V 0.09～0.13; N≤0.030; Al
tot0.01～0.05; P≤0.015; S≤0.005; O≤0.001, all the other are Fe and inevitable impurity, mass percent amounts to 100%.
In steel, C content increases, and yield-point and tensile strength raise, but plasticity and impact reduce.But the high meeting of C amount reduces the atmospheric corrosion resistance ability of steel, can also increase cold shortness and the aging sensitivity of steel, the welding property of steel is degenerated.Therefore, C content is controlled in 0.18～0.24% scope.The Si element can improve intensity and the hardness of steel; Reduce the critical cooling velocity of steel, improve the hardening capacity of steel; Improve the solidity to corrosion of steel in the oxidisability corrosive medium, improve the thermotolerance of steel.Si can reduce the welding property of steel, because stronger than Fe with the avidity Si of O, easily generates the silicate of low melting point when welding, increases the mobility of slag and deposite metal, causes the splash phenomenon, affects weldquality.Si easily makes in steel to form banded structure, makes lateral performance lower than vertical performance.Therefore, Si content is controlled in 0.18～0.30% scope.Mn has strengthening effect to steel, can improve intensity, hardness and wear resistance; Reduce the critical cooling velocity of steel, improve the hardening capacity of steel; Slightly improve the low-temperature flexibility of steel.But Mn crosses the superheated susceptivity that high energy increases steel, improper if high temperature is controlled, by coarsened grain, make in quenching process crystal grain excessive, or after high tempering at temperature limit of brittleness district overstand, make toughness drop.Therefore, Mn content is controlled in 0.50～0.70% scope.In order to obtain the high cleanliness steel, obtain the steel pipe material with superelevation yield strength and good impelling strength simultaneously, reduce as far as possible the content of the harmful elements such as steel inclusion, gas and S, P, therefore want P, S, the O of lower aq.
In steel, Cr can significantly improve intensity, hardness and wear resistance, but reduces plasticity and toughness simultaneously.Cr can improve oxidation-resistance and the erosion resistance of steel, can also increase the hardening capacity of steel and the secondary hardening effect is arranged.Cr makes steel have comprehensive mechanical property preferably after Q-tempering, in converted steel, can also form the carbide containing Cr, thereby improves the wear resistance of material surface.Mo can make the grain refining of steel, improves hardening capacity and thermostrength, keeps enough intensity and creep resisting abilities when high temperature.Mo is that the bainite effect is little to suppressing austenitic transformation, therefore sometimes needs with other element that improves hardening capacity as cooperations such as Cr, Mn.Cr can make the Mo level retained in sosoloid increase, and can produce solid solution strengthening effect to a certain degree.During the Cr-Mo complex intensifying, due to the complex effects that Cr forms and distributes dissimilar carbide, in the time of must making Cr, Mo content maintain optimum value interact with each other, just can receive best strengthening effect.
The effect of V, the one, crystal grain thinning; The 2nd, when doing modifier treatment, can improve tempering temperature, improve the tempering resistance, thereby improve the toughness of steel.The carbide that V and C form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.In steel, the carbide of V exists with minimum granular substance, and they generally can suppress the movement of crystal boundary in steel, thereby simultaneously also can be as the core crystal grain thinning of forming core.N and Cr, Al, V element can be combined to the nitride of stabilizer pole, become surface hardening and strengthening element.In steel, add micro-B just can improve compactness and the hot rolling performance of steel, improve intensity, add micro-B just can play very large effect, for fear of forming boron nitride, affect the effect of B, be suitable add the aluminium fixed nitrogen.Therefore, B is controlled in 0.001～0.005% scope.
The Main Function of Re Elements C e in steel is can make S content significantly reduce after adding Ce in the impurity element of removing in molten steel, particularly steel.MnS in steel is mixed in high temperature and has strong plastic deformation ability, is the major reason that causes the forging Mechanical Property Anisotropy, and Ce can change residual inclusion, is mainly the shape of MnS, thereby improves the intensity of steel.The Ce element forms Ce in steel
2s
3and Ce
3s
4, these Ce sulfide have stronger plasticity_resistant deformation ability, have improved the transverse mechanical performance of steel.In addition, while having H mono-class obnoxious flavour to exist in steel, Ce can play dehydrogenation in steel, and these characteristics can improve the work-ing life of petroleum casing pipe.Ce content is chosen in the transverse mechanical performance that can effectively improve steel pipe in 0.02～0.05% scope.
Production technique of the present invention is as follows:
The seamless steel tube production main technique is: molten iron → converter smelting → LF refining → VD is degassed → and round billet continuous casting → heating of pipe blank → perforation → tube rolling → sizing → thermal treatment.Thermal treatment adopts quenching+tempering technique, and quenching temperature is 910 ± 10 ℃, and soaking time is that the every 1mm of wall thickness is no less than 1.5min, and total soaking time is not less than 30min; Tempering temperature is 640 ± 10 ℃, and soaking time is not less than 1h, then cooling in still air.
Quenching temperature is the austenitizing temperature of steel namely, and formulating principle is Ac
3+ 30～50 ℃.Consider the hardening capacity that improves steel and reduce heat-up time, adopting comparatively high temps better.Formula rule of thumb, the Ac of system of the present invention
3be approximately 870 ℃, so quenching temperature is defined as 910 ± 10 ℃.After the steel pipe heating reaches austenitizing temperature, austenitic forming core will occur, grow up and Homogenization Process, so the steel pipe actual temperature will keep certain hour after reaching regulation.The length of soaking time will slightly adjust according to the alloying element contamination in steel, while containing the carbides such as V, Mo in steel, should suitably increase soaking time, is beneficial to the dissolving of carbide, to reach the effect of giving full play to alloying element.But soaking time is long, by increasing the surface oxidation of steel pipe, affect surface quality.Therefore, soaking time is that the every 1mm of wall thickness is no less than 1.5min, but is not less than 30min.Take water as quenchant, is economy, safety the most, and environmentally safe.Steel pipe is quenched with rotation mode, carries out inside and outside cooling simultaneously.Guarantee during quenching that hardening liquid sprays in the steel pipe internal-surface Rotating with Uniform, the enough recirculated water of outside surface drenches outward.The cooling rate of quenchant water is very fast, and deformation easily occurs steel pipe, when serious, because carrying out next procedure, scraps.For avoiding the generation of deformation, adopt inside and outside tube wall time delay water spray.The spray of internal recycle water is than outside surface time delay 3s, and the flow velocity of water is not less than 10m/s.After quenching, steel pipe still has higher temperature, if cooling improper steel pipe still can produce flexural deformation.For fear of this situation, steel pipe is cooling in natural air, does not adopt the pressure type of cooling, and cooling will the mitigation steadily, should be even in process of cooling.Steel pipe will have on the cold bed of forward and reverse chain, carry out cooling, the steel pipe in rotating state all the time, cooling evenly, can avoid crooked.The polynary steel that contains Mo and B element has stronger tempering resistance, in order to keep in use stablizing of performance of steel, should adopt higher tempering temperature.Therefore tempering temperature is 640 ± 10 ℃, and soaking time is not less than 1h, then cooling in still air.
Advantage of the present invention is: adopt Cr, Mo alloy as main alloy element, and be aided with a small amount of V, B microalloy element, add the Ce element simultaneously, guarantee after steel quench to have intensity preferably, hardness, tiny grain fineness number, have uniform tissue, good each after tempering to impelling strength, product is applicable to the ultra deep well petroleum casing pipe.Production efficiency of the present invention is high, good in economic efficiency, is suitable for large-scale production, has good promotional value.
Embodiment
Each example chemical composition is as listed as table 1, and each example mechanical properties of pipe is as shown in table 2.It is Φ 177.8 * 9.19 mm that example 1,2 is produced the pipe specification, and example 3,4 is Φ 177.8 * 10.36 mm.
Each example chemical composition (wt.%) of table 1
N, P, S, O content meet the System Design requirement.
Each example mechanical properties of pipe of table 2
The fished pipe metallographic structure is tempered sorbite, fine microstructures and evenly, grain fineness number >=9 grade.As can be found from Table 2, each example body mechanical property is all better, and especially transverse impact merit obviously improves, and meets ultra deep well petroleum casing pipe requirement.The steel pipe of producing has better surface quality and dimensional precision.
Claims (2)
1. a ultra deep well petroleum casing pipe, is characterized in that, the mass percent chemical composition of constituent material is: C 0.18～0.24; Si 0.18～0.30; Mn 0.50～0.70; Cr 0.85～1.15; Mo 0.65～0.75; Ce 0.02～0.05; B 0.001～0.005; V 0.09～0.13; N≤0.030; Al
tot0.01～0.05; P≤0.015; S≤0.005; O≤0.001, all the other are Fe and inevitable impurity, mass percent amounts to 100%.
2. the production technique of petroleum casing pipe for ultra deep well according to claim 1, its main technique is: molten iron → converter smelting → LF refining → VD is degassed → and round billet continuous casting → heating of pipe blank → perforation → tube rolling → sizing → thermal treatment, it is characterized in that, thermal treatment adopts quenching+tempering technique, quenching temperature is 910 ± 10 ℃, soaking time is that the every 1mm of wall thickness is no less than 1.5min, and total soaking time is not less than 30min; Tempering temperature is 640 ± 10 ℃, and soaking time is not less than 1h, then cooling in still air.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165877A (en) * | 2017-12-14 | 2018-06-15 | 江苏大学 | A kind of centrifugal ductile cast tube pipe mould steel containing cerium and preparation method thereof |
Citations (7)
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| JPS52131914A (en) * | 1976-04-28 | 1977-11-05 | Nippon Steel Corp | Low alloy high tensile steel for oil contaomer |
| JPH03403A (en) * | 1989-05-29 | 1991-01-07 | Sumitomo Metal Ind Ltd | Die for sizing width of hot slab |
| CN1715432A (en) * | 2004-06-29 | 2006-01-04 | 株式会社神户制钢所 | Corrosion resistance excellent steel for ship |
| JP2007107079A (en) * | 2005-10-17 | 2007-04-26 | Kobe Steel Ltd | Shipbuilding steel excellent in weldability and corrosion resistance |
| CN101250671A (en) * | 2008-03-26 | 2008-08-27 | 天津钢管集团股份有限公司 | Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof |
| CN101285151A (en) * | 2008-06-06 | 2008-10-15 | 天津商业大学 | Petroleum case pipe with high strength and toughness and producing method thereof |
| CN101586450A (en) * | 2009-04-29 | 2009-11-25 | 天津钢管集团股份有限公司 | Have high strength and high toughness petroleum casing pipe and manufacture method thereof |
-
2013
- 2013-09-10 CN CN2013104092667A patent/CN103451543A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131914A (en) * | 1976-04-28 | 1977-11-05 | Nippon Steel Corp | Low alloy high tensile steel for oil contaomer |
| JPH03403A (en) * | 1989-05-29 | 1991-01-07 | Sumitomo Metal Ind Ltd | Die for sizing width of hot slab |
| CN1715432A (en) * | 2004-06-29 | 2006-01-04 | 株式会社神户制钢所 | Corrosion resistance excellent steel for ship |
| JP2007107079A (en) * | 2005-10-17 | 2007-04-26 | Kobe Steel Ltd | Shipbuilding steel excellent in weldability and corrosion resistance |
| CN101250671A (en) * | 2008-03-26 | 2008-08-27 | 天津钢管集团股份有限公司 | Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof |
| CN101285151A (en) * | 2008-06-06 | 2008-10-15 | 天津商业大学 | Petroleum case pipe with high strength and toughness and producing method thereof |
| CN101586450A (en) * | 2009-04-29 | 2009-11-25 | 天津钢管集团股份有限公司 | Have high strength and high toughness petroleum casing pipe and manufacture method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108165877A (en) * | 2017-12-14 | 2018-06-15 | 江苏大学 | A kind of centrifugal ductile cast tube pipe mould steel containing cerium and preparation method thereof |
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Application publication date: 20131218 |