CN101418419A - Middle and low intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same - Google Patents
Middle and low intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same Download PDFInfo
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Abstract
The invention discloses a medium-low intensity oil casing for resisting hydrogen sulfide corrosion and a method for manufacturing the same. The oil casing comprises the following composition in weight percentage: 0.26 to 0.32 percent of C, 0.10 to 0.40 percent of Si, 0.80 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.20 percent of Mo, less than or equal to 0.30 percent of Cr, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, less than or equal to 0.020 percent of Al, and the balance being iron. The method comprises the following steps: molten iron and scrap steel undergoes smelting, external refining and vacuum degassing, and curved continuous casting to prepare a pipe blank; the pipe blank undergoes hot-rolling to prepare a light pipe; and the light pipe undergoes normalizing treatment to obtain the oil casting. The medium-low intensity oil casing has good physical and chemical properties; the indexes thereof achieve or exceed the API standard; the stress threshold value of hydrogen sulfide resistance reaches 80 percent of SMYS; and the values of the crack sensitive rate, the crack length rate, and the crack width rate of the hydrogen induced cracking resisting properties are 0.005 percent, 2.8 percent and 0.09 percent respectively, thus the medium-low intensity oil casing can be applied to oil-gas fields containing hydrogen sulfide.
Description
Technical field
The invention belongs to oil well pipe and production method thereof, particularly a kind of yield strength 379MPa～552MPa (hydrogen sulfide corrosion resistant of 55ksi～80ksi) with in low strength tubing and casing and manufacture method thereof.
Background technology
Carbon steel or low alloy steel is exposed to and contains H
2In the surrounding medium of S, invade in the steel because of the hydrogen that corrosion produces, can cause hydrogen induced cracking (HIC) (HIC), can see hydrogen blistering (HB) on the surface of steel, and sulfide-stress cracking (SSCC) also can take place under stress, the subject matter that the sulfur-bearing oil-gas field development faces is exactly H
2The S etching problem.In China, the sulfur-bearing oil-gas field mainly is distributed in Sichuan, North China and Xinjiang, and is wherein, especially the most serious with area, east, river, because hydrogen induced cracking (HIC) and sulfide-stress cracking meeting cause tubing and casing (oil pipe and sleeve pipe) early failure even cause catastrophic failure to take place, so the anti-H of Development and Production
2The tubing and casing of S becomes the important topic of research naturally.
Steel is at H
2Corrosion failure phenomenon in the S medium just was found before more than 40 year, and the various countries scholar has carried out number of research projects for this reason.Generally believed H
2S not only has very strong corrodibility to steel, and H
2Still a kind of very strong hydrogen medium, H of oozing of S itself
2The S corrosion failure is caused by hydrogen.Contain H
2S sour oil gas field tubing and casing corrosion failure type mainly contains three kinds of forms: uniform corrosion or (with) spot corrosion, sulfide stress cracking (SSC) (SSC), hydrogen bring out crackle (HIC) and hydrogen blistering (HB).
Cause steel matrix rimose process also not have consistent understanding so far.But generally believe that the content of hydrogen generally is very little in the steel, have test to show to have only ppm usually.Therefore, the position of germinating crackle must be the energy that enough enriched hydrogen are arranged.All exist defective in the oil bushing steel that uses on the actual engineering, the bound energy of these defectives and hydrogen is strong, hydrogen can be caught to stick, and makes it to be difficult to diffusion, just becomes the enrichment region of hydrogen, usually these defectives is called trap.The H of molecular state
2S generates atomic hydrogen in a large number and gathers to these traps, in a single day the hydrogen that is enriched in trap be combined into hydrogen molecule, the hydrogen pressure of accumulation is very high, cause stress concentration, so impel the steel embrittlement, regional area generation viscous deformation, and the germinating crackle cause at last the cracking, this type of fracture belongs to sulfide-stress cracking (SSCC).SSCC belongs to low-stress and breaks, and the stress value when SSCC takes place is usually far below the tensile strength of steel, the fracture apperance of its mechanism characteristic that enbrittles.The brilliant destruction in transcrystalline and edge all can be observed, and general high-strength steel mostly is along crystalline substance and breaks.
Influencing tubing and casing hydrogen sulfide corrosion resistant material factor mainly contains: the chemical ingredients of the hardness of material, the microstructure of material and material.
The hardness of tubing and casing (intensity) is the significant variable of tubing and casing H 2 S stress corrosion (SSC) field failure, is the important indicator of control tubing and casing generation sulphide stress corrosion.Tubing and casing hardness is high more, and the required time of ftractureing is short more, illustrates that SSC susceptibility is high more.Find the influence of intensity by a large amount of tests to anti-H 2 S stress corrosion, when yield strength Rt≤700MPa, increase with Rt, anti-H 2 S stress corrosion threshold value σ C increases, still, as Rt〉anti-H 2 S stress corrosion threshold value σ C sharply descends during 700MPa.Practical manifestation is: when YIELD STRENGTH is lower than the stress corrosion threshold value, stress corrosion does not take place; When yield strength was higher than the stress corrosion threshold value, stress corrosion crack can take place in material under the condition far below material yield intensity.Therefore, in NACE MRO175 standard, the anti-SSC material of all of regulation all has the hardness requirement.For example, guarantee that SSC does not take place carbon steel and low alloy steel, just must control its hardness is less than or equal to HRC22.The microstructure of tubing and casing directly affects the anti-SSC performance of steel.To carbon steel and low alloy steel, when its intensity was similar, ascending putting in order was: equally distributed globular carbide in the ferrite, quenching+tempered structure, normalizing+tempered structure, normalized structure, bainite and martensitic stucture fully to different microstructures to SSC susceptibility.The equally distributed tiny globular carbide tissue that the back high tempering that quenches obtains is the optimal tissue of anti-SSC, and bainite and martensitic stucture are the most responsive to SSC, and other will change with the intensity of steel SSC susceptibility between the two tissue.The chemical ingredients of steel it is generally acknowledged in carbon steel and low alloy steel that to the influence of its anti-SSC nickel, manganese, sulphur, phosphorus are harmful element.
Hydrogen induced cracking (HIC) (HIC) be metallic substance under the effect of sulfide hydrogen medium, enter the inner notch cuttype crackle that produces of metallic substance by the hydrogen of separating out in the electrochemical corrosion course, growing of these crackles finally makes the metallic substance cracking.A large amount of facts have proved that HIC susceptibility increases when having banded structure in the material.Will control manganese, phosphorus content for avoiding banded structure to produce.
Summary of the invention
The purpose of this invention is to provide low strength tubing and casing and manufacture method thereof in a kind of hydrogen sulfide corrosion resistant usefulness.The tubing and casing that adopts production method of the present invention to produce can guarantee that the inherent hot rolling attitude of 379Mpa～552Mpa yield strength scope has good anti-H 2 S stress corrosion and hydrogen-induced cracking resistance energy simultaneously.
For solving the problems of the technologies described above, technical scheme of the present invention is: low strength tubing and casing during hydrogen sulfide corrosion resistant is used, and this sleeve pipe composition is counted with weight %: C 0.26～0.32%, Si 0.10～0.40%, and Mn 0.80～1.50%, P≤0.015%, S≤0.005%, Mo≤0.20%, Cr≤0.30%, Cu≤0.30%, Ni≤0.30%, Al≤0.020%, all the other are iron, and some inevitable impurity.The mean value of the responsive rate CSR of the crackle of this tubing and casing hydrogen-induced cracking resistance energy, crack length rate CLR and crackle width rate CTR can reach 0.005%, 2.8% and 0.09% respectively.
The low strength tubing and casing was to adopt following method to realize during this hydrogen sulfide corrosion resistant was used, comprise step: at first raw material molten iron and steel scrap are made steel and make circular pipe blank, then circular pipe blank is made light pipe through the hot rolling tube rolling, at last light pipe is processed into finished product through Overheating Treatment and pipe, the step of wherein making steel is made circular pipe blank after comprising smelting, external refining and vacuum outgas and arc continuous casting.And steel-making is adopted LF stove+VOD stove to carry out refining and is also fed silk simultaneously for adopting oxygen coverter or electrosmelting, adopts the ACC continuous casting to make circular pipe blank; Tube rolling heats circular pipe blank at first adopting rotary heating furnace, adopts two roller tapered rollers perforation then, tube rolling mill is rolling and 14 sizing mill tube reducings, and through aligning and sawing finishing procedure, after non-destructive test(ing)(NDT) gets light pipe; Thermal treatment and pipe are processed as and connect twisting by pipe end car silk, box cupling after the light pipe thermal treatment, the homogeneous tube water test, make the processed oil sleeve pipe at last.
In actual production, can adopt
(1) steel-making adopts 40t oxygen coverter (or 30t electric furnace) to smelt, and adopts LF stove (ladle smelting furnace)+VOD stove (vacuum outgas) refining+hello silk then, adopts ACC continuous casting (arc continuous casting steel machine) to make circular pipe blank afterwards;
(2) tube rolling adopts the heating of rotary heating furnace circular pipe blank earlier, then with the accurate tube rolling mill of two roller tapered roller perforation+ACCU-ROLL rolling+14 sizing mill tube reducings, afterwards by aligning and sawing finishing procedure, non-destructive test(ing)(NDT) at last becomes and is used to produce oil the seamless light pipe of sleeve pipe;
(3) thermal treatment and pipe processing with after the light pipe thermal treatment by pipe end car silk, box cupling twist and connect, the homogeneous tube water test, make the tubing and casing of finished product at last.
And normalizing treatment is adopted in thermal treatment, normalizing temperature 〉=880 ℃.
Adopt hydrogen sulfide corrosion resistant that the inventive method produces with mentioned component with in the low strength tubing and casing have good physicochemical performance, use properties, anti-H 2 S stress corrosion and hydrogen-induced cracking resistance energy, its anti-H 2 S stress corrosion threshold value reaches 80%SMYS (nominal SMYS), three evaluation indexes of hydrogen-induced cracking resistance energy, the responsive rate (CSR) of crackle, crack length rate (CLR), crackle width rate (CTR) are respectively less than 2%, 15%, 5%.Three's mean value can reach 0.005%, 2.8% and 0.09% respectively.(55ksi～80ksi) the anti-H 2 S stress corrosion threshold value and the hydrogen-induced cracking resistance of tubing and casing can index have originality in industry like product at 379～552MPa in present yield strength.
Embodiment
The present invention is based on that following technological thought draws: because the yield strength of this grade of steel is lower, be issued to the content that corresponding H 2 S stress corrosion threshold value depends primarily on S element in the steel in such intensity, thereby the content of control S just can improve the ability of resisting sulfide stress corrosion reaches threshold value, that hydrogen is brought out cracking (HIC) is responsive totally unfavorable for perlite banded structure in the steel in addition, this be because: the perlite band of segregation is on the ferritic phase interface, therefore be good defeated hydrogen channel, steel dislocation desity after rolling increases, can quicken the diffusion of hydrogen atom in the dislocation passage, promoted hydrogen to bring out the expansion of crackle along segregation line, in case exist hydrogen to bring out the forming core of crackle, the plastic zone of crack tip just has slip band and produces, because slip band and pearlitic intersection have a large amount of dislocations to produce, and accompany by highdensity hydrogen group, so the susceptibility of the perlite band of segregation is higher than ferrite.Therefore, the formation of control perlite banded structure is to improve the effective measure that anti-hydrogen brings out cracking performance to obtain thermodynamic(al)equilibrium and stable fine grain structure.
Below in conjunction with each chemical element sulphide stress corrosion and hydrogen induced cracking (HIC) susceptibility are described in detail the process that tubing and casing of the present invention realizes
C is present in the steel with the form of gap solid solution atom or carbide, play solution strengthening, increase hardening capacity and dispersion-strengthened, it is the main strengthening element in the steel, it simultaneously is again one of harmful element that reduces toughness and corrosion resistance nature, the insufficient strength of the too low tubing and casing of carbon, the too high hardness that can improve steel.Therefore carbon content will suitably be controlled, and preferred C content is % meter 0.26～0.32% by weight;
Si is not only reductor, also can improve the intensity of steel, can reduce toughness but add a large amount of silicon, and silicon is few more, and the anti-H 2 S stress corrosion ability is high more, controlled contents Si≤0.40%, and preferred content is % meter Si 0.10～0.40% by weight;
Mn is unfavorable for anti-H
2The S corrosion.Mn combines with S and can form MnS and be mingled with, and becomes the micro cathode in the steel, reduces the toughness of steel, brings out hydrogen induced cracking or intergranular corrosion cracking easily, thereby reduces the anti-H of steel
2The S corrosive nature.When manganese content surpassed 1.5%, the segregation of manganese can take place in strand, and along with the increase of carbon content, this segregation is more remarkable, and this segregation meeting causes banded structure to produce, thereby may cause HIC.The controlled contents of should trying one's best Mn≤1.5%, preferred L n content is % meter Mn 0.80～1.50% by weight;
P makes steel produce segregation easily in crystallisation process.Even also be not easy to make being evenly distributed of P, so can produce high P and low P band by thermal treatment.When austenitic state cools off, high P band is because A3 temperature height, at first separate out ferrite, carbon is concentrated to low P band, changes perlite subsequently into, thereby causes perlite to separate with ferritic, in the operation of rolling, just can form banded structure, the controlled contents of should trying one's best P≤0.015%, preferred P content is % meter P≤0.014% by weight
S is easy to form sulfide inclusion, have a strong impact on mechanical property, especially impelling strength, the content that reduces S can make the susceptibility of the HIC in the steel reduce and significantly improve the impelling strength of steel, reduce S content and can reduce the formation quantity of strip MnS, thereby also improve the anti-H 2 S stress corrosion performance.Controlled contents S≤0.005%, preferred S content is % meter S≤0.003% by weight;
Do not see at present that by searching open source information tubing and casing of the present invention contrasts with the chemical ingredients of domestic and international other identical grade of steel tubing and casing and sees Table 1 to the detailed introduction of low strength tubing and casing products production in 55ksi～80ksi level hydrogen sulfide corrosion resistant usefulness
Low strength tubing and casing chemical ingredients contrast (weight %) during table 1 hydrogen sulfide corrosion resistant is used
| Classification | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Al |
| 1 | 0.29 | 0.24 | 1.28 | 0.014 | 0.003 | 0.05 | -- | -- | 0.010 | 0.014 |
| 2 | 0.34 | 0.30 | 1.35 | 0.015 | 0.008 | 0.10 | -- | -- | 0.010 | 0.035 |
| 3 | 0.35 | 0.29 | 1.48 | 0.018 | 0.010 | 0.15 | 0.010 | 0.035 | ||
| 4 | 0.36 | 0.31 | 1.50 | 0.016 | 0.010 | 0.15 | 0.010 | 0.034 | ||
| 5 | --- | --- | --- | ≤0.030 | ≤0.030 | --- | --- | --- | --- | --- |
Illustrate: 1-the present invention, 2-Baosteel open source information 3-pipe open source information 4-Sumitomo, sky 5-API standard
The method of concrete manufacturing product of the present invention may further comprise the steps:
1. the steel-making continuous casting technical process is adopted in steel-making, and its step is
Steel-making converter (or electric furnace) smelting → external refining → VOD vacuum outgas → arc continuous casting+induction stirring → cooling → check reconditioning → pipe;
2. tube-rolling technique flow process
Pipe blanking → ring furnace heating → cone-type piercer → AR tube rolling → high-pressure water descaling → slight-stretch reducing footpath → cooling → aligning → crop end, segmentation → online magnetic leakage detection → manual checking, reconditioning → total length drift test → light pipe;
3. thermal treatment and pipe processing technique flow process
Light pipe → normalizing → ultrasonic inspection → total length drift test → pipe end magnetic-particle inspection → car silk → twist box cupling → pipe end drift test → hydrostatic test → car silk → upward guard ring → japanning → spray printing sign → packing → finished product to put in storage.
The manufacture method of tubing and casing of the present invention is achieved in that
1. steel-making
Adopt inclusion constituent content low high-quality molten iron or sponge iron and be aided with the high-quality steel scrap, utilization top-blown oxygen converter or electric furnace are smelted, wherein P content should be lower than 0.15% in the molten iron, S content should be less than 0.04%, by in molten steel, adding the lime making foamed slag of high reactivity degree, fully absorb harmful element P, S etc. in the molten steel.Utilize ladle refining+vacuum outgas+Control and Inclusion Removal technology, carry out external refining.C in the steel can control effectively in the external refining control process, the carburetting problem that also will avoid refractory materials to cause after the refining.Adopt when the S in the steel is controlled at LF and dust, add the top slag or use the calcium treatment technology to finish.Oxygen content in steel is too high, and oxide inclusion and macroscopic view are mingled with increase, has a strong impact on the cleanliness factor of Guan Gang, oxide inclusion is one of root of steel generation HIC and SSCC in the steel, the various performances of harm steel, especially after the inclusion diameter is greater than 50, the various performances of severe exacerbation steel.In order to prevent to occur in the steel diameter greater than 50 oxide inclusion, reduce oxide inclusion quantity, generally control oxygen content in steel less than 50ppm.Adopt external refining LF+VOD and WF (Wire Feed feeds silk) can obtain lower oxygen level, in addition, because refractory materials oxygen supply, molten steel should reduce secondary oxidation as far as possible in transportation and casting process, by improving tundish structure and selecting good tundish covering slag that oxygen level is effectively controlled.Hydrogen is the major cause that causes white point and crackle in the steel.Hydrogen richness in the steel is high more, the probability that HIC produces is big more, corrosion rate is high more, the increase of average crack length is remarkable more, utilize boiling dehydrogenation of electric furnace CO oxidation period bubble and external refining (as Argon stirring, VOD refining) degasification process can control the hydrogen richness in the steel well, controlled hydrogen manufacturing measured value W[H]≤0.0002%, in addition, prevent that other stages of making steel from increasing hydrogen, adopt ladle and tundish preheating baking can effectively reduce the hydrogen of molten steel.In the casting process, in ladle and tundish system, can obviously reduce the hydrogen of molten steel to the use repeatedly of protective casing heating and same protective casing.The dephosphorization of steel all can carry out in the whole process of steel-making, but final dephosphorization all is to adopt external refining to finish, and its process is: after the tapping of electric furnace dephosphorization, be blown into gas in LF, carry out the strong mixing dephosphorization; Remove dephosphorized slag fully, prevent rephosphorization, carry out reduction refining then; Winding-up Ca-Si pulvis obtains ultra-low phosphoretic steel.Steel inclusion in most of the cases all is the origin of HIC, plastic occluded foreignsubstance in the steel and brittle inclusion are the main roots that produces HIC, analysis revealed HIC port surface has the MnS of extension and Al2O3 point chain to be mingled with, and the formation of the formation of SSC and HIC is closely related, in order to improve anti-HIC and anti-SSC ability, must reduce inclusion in the steel as far as possible, accurately control the form of inclusion, calcium is handled can control the form of steel inclusion well, thereby improves the anti-HIC and the SSCC ability of pipe line steel.Cast circular steel billet with curved type continuous caster after smelting steel is finished, should strictly control molten steel overheat, casting speed and cooling water inflow during throwing, should adopt long nozzle protection cast.
2. tube rolling
Pipe is at 28mm or 14m ring furnace internal heating, the heating of employing microcomputer control, according to the combustion gas calorific value reasonably regulate combustion gas and air empty so than, 1250～1270 ℃ of heating of pipe blank temperature, guarantee that heating of pipe blank time and temperature are even, the cone type piercer of godet or guide plate about the pipe perforation is adopted and is with, when piercing pipe, adjusts by tapping machine every processing parameter, for tube rolling provides wall thickness deviation little, wall thickness is even, the hollow billet of suitable external diameter, hollow billet after the perforation adopts ACCU-ROLL, and accurate tube rolling mill is rolling can obtain the higher hollow forging of wall thickness accuracy, owing to be oblique milling, some inhomogeneity of wall thickness that it can bring perforation are done further to correct, the inhomogeneity of wall thickness of hollow forging can further be controlled at ± 5% in, the tension reducing unit guarantees to obtain the tubing and casing light pipe that external diameter and wall thickness accuracy satisfy standard-required, six-roller straightener guarantees that the straight degree of tubing and casing is controlled at 1.5mm/m, by designing suitable rolling technological parameter, adopt high-quality warp tool, as: the top, roll, plug, godets etc. also are optimized tubing and casing surfaces externally and internally quality.
3, tubing and casing thermal treatment and processing
In heat treatment furnace by whole normalizing can make tubing and casing light pipe overall performance evenly make it satisfy standard-required to the tubing and casing light pipe, and can eliminate or alleviate banded structure in the steel after the normalizing thermal treatment, guarantee that steel has good anti-H 2 S stress corrosion cracking and hydrogen-induced cracking resistance energy.Pursue the Zhi Jinhang ultrasonic inspection after the thermal treatment.
The normalizing Heating temperature is set at more than 880 ℃.
Screw thread adopts the processing of umber of feed inlet controlled machine, guarantees that working accuracy meets API standard code requirement, and every tubing and casing is done the water test, guarantees that the voltage stabilizing time is no less than 10 seconds.
By above manufacture method utilization, make 379MPa～552MPa that the present invention produces (anti-H 2 S stress corrosion of 55ksi～80ksi) and hydrogen-induced cracking resistance can oil well pipe or telescopic anti-H 2 S stress corrosion cracking and hydrogen-induced cracking resistance can reach good quality level with other performances, with the hydrogen-type corrosion of 55ksi steel grade sulfur resistant with in low strength tubing and casing product be that the example division is as follows:
The A chemical ingredients
Tubing and casing composition of the present invention is even, fluctuation range is little, and harmful element content such as P, S are low, meets API 5CT and composition designing requirement fully, thereby has favorable tissue and the performance condition that provides the foundation for tubing and casing.The chemical ingredients statistic analysis result sees the following form 2
Table 2 tubing and casing chemical ingredients of the present invention statistics (weight %)
| Element | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Al |
| Mean value | 0.28 | 0.26 | 1.25 | 0.013 | 0.003 | 0.08 | -- | -- | 0.09 | 0.012 |
The B mechanical property
On the tubing and casing tubing of the present invention after the normalizing, get one group of stretching, impact and hardness test check for every batch, the assay statistical average value sees Table 3
Table 3 tubing and casing mechanical properties test of the present invention statistics
| Classification | Tensile strength Rm (Mpa) | Yield strength Rt0.5 (Mpa) | Elongation A (%) | Hardness HB | Vertical 0 ℃ of ballistic work Akv, 10*10*55mm |
| The present invention | 670 | 461 | 25 | 214 | 32 |
| The same grade of steel of API | ≥517 | Min379 Max552 | 23 | ---- | ---- |
The C metallographic structure
The microstructure of tubing and casing of the present invention is even, crystal grain is tiny, the horizontal grade summation of non-metallic inclusion is less than 5 grades, and banded structure is less than 1 grade, and inspection statistics the results are shown in Table 4
Table 4 inclusion of the present invention and metallographic structure statistics
The working accuracy that D is oil casing threaded
The oil casing threaded working accuracy height of the present invention, every index all are controlled at half that API5B allows.Embodying the thread taper of two important indicators of oil casing threaded mass property and the concrete parameter of accurate distance is:
Tight distance: all take off data are all in 50% of API standard.
Thread taper: the thread taper 90% of tubing and casing is all between 0.0625-0.0635in.
E anti-H 2 S stress corrosion performance
Tubing and casing of the present invention is carried out the anti-H 2 S stress corrosion test according to the NACE TMO177 A method of NACE TMO175 standard code, the result shows to have good anti-H 2 S stress corrosion performance, and its anti-H 2 S stress corrosion threshold value reaches 80%SMYS (nominal SMYS).
F hydrogen-induced cracking resistance energy
Tubing and casing of the present invention is carried out anti-hydrogen induced cracking (HIC) test according to NACE TMO0284-2003 standard, the result shows to have good hydrogen-induced cracking resistance energy, and the responsive rate (CSR) of crackle, crack length rate (CLR), crackle width rate (CTR) mean value are respectively 0.005%, 2.8%, 0.09%.
G tubing and casing use properties
Tubing and casing of the present invention has been carried out the homogeneous tube benchmark test on the tubing and casing combined testing machine, the result shows that it has excellent use properties, can satisfy the regulation of API 5C1 and API 5C2 standard fully, meets the service requirements in oil field.
More than be the application's a embodiment, should be understood that these embodiment only are used to the present invention is described and are not used in to limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (5)
1, low strength tubing and casing during a kind of hydrogen sulfide corrosion resistant is used is characterized in that, the pipe composition is counted with weight %: C 0.26～0.32%, Si 0.10～0.40%, Mn 0.80～1.50%, P≤0.015%, S≤0.005%, Mo≤0.20%, Cr≤0.30%, Cu≤0.30%, Ni≤0.30%, Al≤0.020%, all the other are iron.
2, low strength tubing and casing during hydrogen sulfide corrosion resistant as claimed in claim 1 is used is characterized in that: the mean value of the responsive rate of the crackle of described tubing and casing hydrogen-induced cracking resistance energy, crack length rate and crackle width rate is respectively 0.005%, 2.8% and 0.09%.
3, low strength tubing and casing manufacture method during hydrogen sulfide corrosion resistant as claimed in claim 1 is used, it is characterized in that comprising step: at first raw material molten iron and steel scrap are made steel and make circular pipe blank, then circular pipe blank hot rolling tube rolling is made light pipe, at last finished product is processed in light pipe thermal treatment and pipe, the step of wherein making steel is made circular pipe blank after comprising smelting, external refining and vacuum outgas and arc continuous casting.
4, low strength tubing and casing manufacture method during hydrogen sulfide corrosion resistant as claimed in claim 3 is used is characterized in that:
Described steel-making is smelted for adopting oxygen coverter or Electric furnace steel making, and employing LF stove and VOD stove carry out refining and vacuum outgas and feed silk, adopt the ACC continuous casting to make circular pipe blank;
Described tube rolling heats circular pipe blank at first adopting rotary heating furnace, adopts two roller tapered rollers perforation then, tube rolling mill is rolling and 14 sizing mill tube reducings, and through aligning and sawing finishing procedure, after non-destructive test(ing)(NDT) gets light pipe;
Described thermal treatment and pipe are processed as twisting and connect and the homogeneous tube water test by pipe end car silk, box cupling after the light pipe thermal treatment, make the processed oil sleeve pipe at last.
5, as claim 3 or 4 described hydrogen sulfide corrosion resistants with in low strength tubing and casing manufacture method, it is characterized in that: normalizing treatment is adopted in described thermal treatment, normalizing temperature 〉=880 ℃.
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| CNA2008102381341A CN101418419A (en) | 2008-12-09 | 2008-12-09 | Middle and low intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same |
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| CNA2008102381341A CN101418419A (en) | 2008-12-09 | 2008-12-09 | Middle and low intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same |
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| CN107747036A (en) * | 2017-10-24 | 2018-03-02 | 潍坊友容实业有限公司 | High corrosion resistant saline alkali land drainage tubing and preparation method thereof |
| CN107829040A (en) * | 2017-10-24 | 2018-03-23 | 潍坊友容实业有限公司 | High intensity salt resistance alkali metal tubing and preparation method thereof |
| CN113546979A (en) * | 2021-07-22 | 2021-10-26 | 良启金属南通有限公司 | Preparation process of high-strength metal bar |
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