CN103695786A - Corrosion-resistant highly-extrusion-resistant petroleum casing and production method thereof - Google Patents
Corrosion-resistant highly-extrusion-resistant petroleum casing and production method thereof Download PDFInfo
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Abstract
The invention discloses a corrosion-resistant highly-extrusion-resistant petroleum casing and a production method thereof. The type of steel comprises the following chemical components: 0.18-0.30 wt% of C; 0.20-0.35 wt% of Si; 0.90-1.30 wt% of Mn; 0-0.50 wt% of Cr; 0.01-0.07 wt% of Ti; 0.15-0.35 wt% of Mo; 0.01-0.05 wt% of V; 0-0.25 wt% of Ni; 0-0.05 wt% of Nb; 0.001-0.005 wt% of B; 0.002-0.01 wt% of Y; not more than 0.008 wt% of P; not more than 0.004 wt% of S; and the balance of Fe. The casing is manufactured by the process of microalloyed rolling-controlled cooling-controlled steel plates, FFX moulding, high frequency resistance welding, weld joint rolling and annealing processing, hot stretch reducing, whole pipe thermal refining, and hot sizing and hot straightening. The product of the invention has the characteristics of high anti-external extrusion collapse strength, good impact toughness, and excellent H2S/CO2/Cl-corrosion resistance.
Description
Technical field:
The invention belongs to petroleum casing pipe field, relate to a kind of oil and gas deep-well, ultra deep well exploitation sleeve pipe, especially a kind of anti-corrosion high anti-extrusion petroleum casing pipe and production method thereof.
Background technology:
Along with the increase of national economy to hydrocarbon resources demand, many deep-wells, ultra deep well and other bad ground Oil/gas Wells are constantly developed, and when sleeve pipe is on active service at these Oil/gas Wells, not only will bear very high outer compressive load, also will bear high temperature and H
2s, CO
2, Cl
-etching problem.As the oil-gas fields such as the Xinjiang of China, Sichuan, the southern Texas of the U.S., Barrow horse, the oil-gas fields such as Canadian A Erbaida.Therefore, exploitation has the high collapse strength product of certain anti-corrosion effect, the demand that meets high temperature, high pressure, rock stratum creep and contain the harsh hole conditions such as corrosive medium.
Domestic and international anti-corrosion high anti-extrusion petroleum casing pipe be take seamless tube as main at present, although seamless tubulation can be produced large wall thickness, high-carbon, high alloy and stainless steel sleeve pipe, but adopt the rear perforation of continuous casting steel billet heating moulding, tube blank size precision is low, and pipe surface is prone to the defects such as rolling crack, layering, oxide inclusion, critical external compressive resistance squeezes ruins poor-performing.Development along with Clean Steel, Controlled Rolling And Controlled Cooling, high frequency resistance welding connection technology, thermotension tube reducing technology, Dynamic Non-Destruction Measurement and computer technology, HFW (High Frequency Welding, i.e. high frequency resistance welding) sleeve pipe production technology level constantly promotes.HFW sleeve pipe has the advantages such as high, the anti-inside and outside pressure performance of dimensional precision is good, cost is lower compared with seamless casing, is at home and abroad widely used.But there is obvious difference in the aspects such as the composition of HFW weld metal zone and mother metal, weave construction and stressed condition, causes the impelling strength of weld metal zone and corrosion resistance poor.At present, main by weld seam thermal treatment and entirely manage thermal treatment and eliminate the tissue of weld metal zone and mother metal, performance difference.Baoji steel pipe adopts " microalloying controlled rolling and controlled cooling steel plate+FFX moulding+hight frequency welding+weld seam rolls and anneal+thermotension tube reducing+entirely manage modifier treatment+hot size and hot straightening+full pipe flaw detection ", developed the serial high collapse strength product of SEW (Hot Stretch-reducing Electric Welded Pipe, high frequency welding heat is opened and subtracted).Because roll bending used is that micro-alloyed steel forms through controlled rolling and controlled cooling rolling, there is good obdurability and higher dimensional precision; Through weld seam anneal, thermotension tube reducing and modifier treatment, realized on the one hand the serialization High-efficient Production that the female pipe of same specification is produced series specification thermotension reducer simultaneously, optimized on the other hand the Microstructure and properties of weld metal zone, itself and mother metal are consistent.Therefore, SEW technique is to manufacture the good method of anti-corrosion high anti-extrusion petroleum casing pipe.
Affect sleeve pipe critical external compressive resistance and squeeze that to ruin the factor of performance a lot, as external diameter and wall thickness ratio (being D/t), body yield strength, external diameter out of roundness, eccentricity, unrelieved stress etc.Affect the anti-H of sleeve pipe
2s/CO
2/ Cl
-the material factors of corrosion mainly contains chemical composition, manufacture method, product strength, hardness and local variation, cold working amount, as-heat-treated condition, microtexture and homogeneity thereof etc. thereof.The present invention controls inclusion content by strict, and adds trace alloying element, adopts cooling controlling and rolling controlling process, and the grain fineness number of steel plate is controlled at more than 11 grades, and be controlled at-2%t of eccentricity～+ 2%t, guarantees obdurability and wall thickness accuracy that steel plate is good; In steel pipe FFX moulding process, reduce the fluctuating quantity at edge as far as possible, make steel band two edges as far as possible parallel before entering extrusion roll, guarantee that two edges of boards carry out high-frequency resistance welding with " I " font, and control the key elements such as amount of compression, welding speed, V-type angular aperture well, guarantee welding quality, carry out interior external burr removing, weld seam rolls and anneal (essence is thermomechanical treatment), guarantee that weld metal zone and periphery are smooth, improve pipe external diameter precision, and subdue the histological difference of weld metal zone and mother metal; HFW pipe is again through Frequency Induction Heating and through thermotension tube reducing, weld metal zone dimension reduction, and welding flaw and dislocation disappear, and the tissue of weld metal zone and mother metal is tending towards uniformity; Add the elements such as B, Y, Cr, Ni, through modifier treatment, body obdurability is good, and has good corrosion resistance; Do not affecting under the prerequisite of the modified performance of sleeve pipe, improving hot size and hot straightening temperature, reducing to greatest extent unrelieved stress anti-the squeezing of sleeve pipe ruined and the impact of corrosion resistance.
Chinese patent CN 1317480C discloses a kind of high strength petroleum sleeve pipe and manufacture method thereof, its eccentricity < 15%, external diameter out of roundness < 0.5%, unrelieved stress < 160MPa, unit elongation >=12%, 0 ℃ of full-scale ballistic work >=33J, body grain fineness number >=6 grade; Chinese patent CN101984124A discloses a kind of anti-corrosion collapse-resistance casing, and its manufacturing process is seamless tube rolling, compares with welding tube-making of the present invention, and cost is higher.The present invention has added rare earth element y, and adopt the high collapse strength high comprehensive performance of SEW explained hereafter: eccentricity < 2%, external diameter out of roundness < 0.3%, unrelieved stress≤80MPa, 0 ℃ of ballistic work>=100J, unit elongation > 26%, critical external compressive resistance squeezes ruins the super API TR5C3 of intensity standard more than 50%, and has good anti-H
2s/CO
2/ Cl
-corrosive nature.
Summary of the invention:
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of high resistance to squeeze and there is certain anti-H
2s/CO
2/ Cl
-the petroleum casing pipe of corrosion, squeezes and takes into account anti-H with the high resistance of satisfying the demand
2s/CO
2/ Cl
-the hole condition demand of corrosion.
The technical solution used in the present invention is as follows:
An anti-corrosion high anti-extrusion petroleum casing pipe, the Chemical Composition of this petroleum casing pipe is as follows: C:0.18～0.30wt%; Si:0.20～0.35wt%; Mn:0.90～1.30wt%; Cr:0～0.50wt%; Ti:0.01～0.07wt%; Mo:0.15～0.35wt%; V:0.01～0.05wt%; Ni:0～0.25wt%; Nb:0～0.05wt%; P :≤0.008wt%; S :≤0.004wt%; Surplus is Fe.
In the Chemical Composition of described petroleum casing pipe, also contain B:0.001～0.005wt%; Y:0.002～0.01wt%.
Yield strength 880～the 960MPa of described petroleum casing pipe; Tensile strength >=946MPa; Collapsing strength >=115MPa; Unit elongation > 26%; 0 ℃ of ballistic work: >=100J; Unrelieved stress :≤80MPa.
A preparation method for anti-corrosion high anti-extrusion petroleum casing pipe, in accordance with the following steps: (1) microalloying controlled rolling and controlled cooling steel plate, (2) FFX moulding, (3) high-frequency resistance welding, (4) weld seam rolls and anneal, (5) thermotension tube reducing, (6) manage that modifier treatment, (7) hot size and hot straightening, (8) manage that carrying out flaw detection, the water test, latus rectum are processed entirely entirely, check warehouse-in after car screw thread.
Described step (1) is micro-is that to adopt wall thickness deviation be raw material at the microalloying controlled rolling and controlled cooling steel plate of-2%t～+ 2%t, and the Chemical Composition of steel plate is as follows: C:0.18～0.30wt%; Si:0.20～0.35wt%; Mn:0.90～1.30wt%; Cr:0～0.50wt%; Ti:0.01～0.07wt%; Mo:0.15～0.35wt%; V:0.01～0.05wt%; Ni:0～0.25wt%; Nb:0～0.05wt%; B:0.001～0.005wt%; Y:0.002～0.01wt%; P :≤0.008wt%; S :≤0.004wt%; Surplus is Fe.
The Composition Design principle of above-mentioned each chemical element is as follows:
C: improve hardening capacity element, can effectively guarantee the intensity of steel, but too high levels will affect impelling strength and the welding property of steel, therefore controlling its content is 0.18～0.30wt%.
Si: solid solution is in ferrite to improve the intensity of steel, and too high levels will affect ductility and the impelling strength of steel, and therefore controlling its content is 0.20～0.35wt%.
Mn: improve the hardening capacity element of steel, dissolve in ferrite and play strengthening effect, but segregation is serious during too high levels, damage anti-performance and the corrosion resistance of squeezing of sleeve pipe, therefore controlling its content is 0.90～1.30wt%.
Cr: improve hardening capacity and carbide, during tempering, carbide precipitate can improve the intensity of steel, but can increase the quenching property of tempering of steel during too high levels, therefore controlling its content is 0～0.50wt%.
Mo: improve hardening capacity and the temper resistance element of steel, steel grade adds a certain amount of Mo, is conducive to keep high strength and the high tenacity of steel, and favourable to corrosion resistance, but too high levels can reduce the toughness of steel, and increase cost, therefore controlling its content is 0.15～0.35wt%.
Nb: mainly come superheated susceptivity and the temper brittleness of crystal grain thinning and reduction steel by element solid solution and Nb (CN) precipitation strength, improve intensity, improve welding property, too high meeting increases cost, and therefore controlling its content is 0～0.05wt%.
Ti: carbide, the TiN of formation, TiC all can stop Austenite Grain Growth in soaking with in reheating process, and too high levels easily forms thick TiN.Therefore controlling its content is 0.01～0.07wt%.
V: carbonitride small and dispersed in ferrite is separated out can further reach the effect of precipitation strength in the process of tempering, and the effectively motion of anchoring dislocation hinders starting of slip system, improves the anti-performance of squeezing of sleeve pipe.Should adopt content 0.01～0.05wt%.
Ni: improve hardening capacity element, can improve the intensity of steel and significantly do not reduce its toughness.Can also improve the anti-H 2 S performance of steel, can not only be acidproof, and can alkali resistant and atomospheric corrosion.Should adopt content 0～0.25wt%.
B: improve hardening capacity element, can generate BN with N, stop Austenite Grain Growth, but too high levels, easy intercrystalline precipitation boride, toughness and the anti-H 2 S performance of reduction material, should adopt content 0.001～0.005wt%.
Y: crystal grain thinning, strengthening crystal boundary, postpone the crack propagation on crystal boundary, improve anti intercrystalline corrosion performance.Should adopt content is 0.002～0.01wt%.
During the middle steel-pipe welding of described step (3), V-type angular aperture is set as that 3～5 °, amount of compression are set as 0.3t～0.6t, welding speed is set as 15～30m/min, postwelding carries out inside and outside weld seam burr removing immediately, weld seam rolls and anneal, annealing temperature is 850～1000 ° ℃, improves weld metal zone tissue and dimensional precision.
Described step (5) adopts Frequency Induction Heating mode, heating rate by welded tube with 20～60 ℃/s is rapidly heated more than tubing Ac3 temperature, then the speed with 0.5～2.8m/s enters thermotension tube reducing unit tube reducing to the pipe of required specification, weld metal zone and mother metal crystal grain generation dynamic recrystallization, grain fineness number reaches more than 11 grades, and body homogeneous microstructure is consistent.
Described step (6) is to adopt quenching+high tempering to process, and quenches and adopts water quenching technology, and quenching temperature is 890～950 ℃, and soaking time is 30～80min, and quenching cooling rate is 40～100 ℃/s; Tempering temperature is 590～700 ℃, and tempering insulation time is 50～120min.
In described step (7), hot size temperature >=550 ℃, hot straightening temperature >=500 ℃, the external diameter out of roundness < 0.3% of control sleeve pipe, eccentricity < 2%.The unrelieved stress that employing X ray stress distribution instrument and otch method record sleeve pipe is all lower than 80MPa.
Compared with prior art, the present invention has marked improvement, is in particular in:
1) tube blank size precision is high: owing to adopting microalloying controlled rolling and controlled cooling steel plate to make raw material, by FFX moulding and high-frequency resistance welding, and the inside and outside burr of butt welded seam is repaired and is rolled, eccentricity < 2%, external diameter out of roundness < 0.3%.2) pipe residual stress is low: by adding the elements such as Cr, Ni, Mo, improve body high tempering stability, tempering temperature is controlled to 590～700 ℃, sleeve pipe unrelieved stress≤80MPa.3) sleeve pipe critical external compressive resistance squeezes and to ruin that intensity is high, impelling strength good, corrosion resistance is good: adopt microalloying controlled rolling and controlled cooling+HFW welding microalloy+weld seam to roll and the tube reducing+modifier treatment of anneal+thermotension, guarantee the uniformity of weld metal zone and mother metal tissue and high obdurability, the crowded intensity of ruining of sleeve pipe critical external compressive resistance surpasses API TR5C3 standard more than 50%, is better than similar seamless tube and welded tube product.In addition, compared with common tempering welded casing, there is better anti-H
2s/CO
2/ Cl
-corrosive nature.4) production cost is low: adopt microalloying controlled rolling and controlled cooling and thermotension reducing process, and can be by be controlled at-2%t of the wall thickness deviation of steel plate～+ 2%t; Adopt FFX moulding and thermotension reducing process, can be by be controlled at-0.15%D of the outside diameter tolerance of pipe～+ 0.15%D.Compare same specification, with the seamless casing of weight, SEW is anti-corrosion, and high anti-extrusion petroleum casing pipe depth of falling well has increased more than 5%, virtually for user has saved more than 5% purchase cost.In addition, the anti-corrosion high anti-extrusion petroleum casing pipe lumber recovery of SEW is also high compared with seamless casing.
Accompanying drawing explanation
Fig. 1 is the front weld metal zone of HFW pipe thermotension tube reducing SEM pattern;
Fig. 2 is production tube weld metal zone SEM pattern;
Fig. 3-1 is structure unrelieved stress test position schematic diagram, and Fig. 3-2 are A-A face sectional view;
Fig. 4 is anti-corrosion high anti-extrusion petroleum casing pipe outside surface residual stress distribution figure;
Fig. 5 is anti-corrosion high anti-extrusion petroleum casing pipe internal surface residual stress distribution figure;
Fig. 6 is anti-corrosion high anti-extrusion petroleum casing pipe electrochemical tests figure;
Fig. 7 is anti-corrosion high anti-extrusion petroleum casing pipe vertical weld HIC erosion profile (* 10);
Fig. 8 is anti-corrosion high anti-extrusion petroleum casing pipe vertical weld SSCC erosion profile (* 10).
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
1), referring to Fig. 1,2,3-1,3-2,4,5,6,7,8, embodiments of the invention and comparative example chemical composition are in Table 1.
Table 1 embodiment and comparative example chemical composition (wt%)
2) the geometric accuracy span of control of this sleeve pipe is as follows:
Take specification as Φ 139.7mm * 9.17mm sleeve pipe be example.External diameter: 139.65～139.98, external diameter out of roundness: < 0.3%; Wall thickness: 9.15～9.33, eccentricity: < 2.0%.
3) this sleeve pipe adopts weld seam to roll and anneal, and annealing temperature is 850～1000 ℃.
4) this sleeve pipe adopts Frequency Induction Heating mode, more than HFW welded tube is heated to Ac3 temperature with the heating rate of 20～60 ℃/s, then with the speed of 0.5～2.8m/s, enters roll unit and carries out hot rolling tube reducing, obtains the pipe of required specification.
5) this sleeve pipe adopts quenching+high tempering to process, and quenches and adopts water quenching technology, and quenching temperature is 890～950 ℃, and soaking time is 30～80min, and quenching cooling rate is 40～100 ℃/s; Tempering temperature is 590～700 ℃, and tempering insulation time is 50～120min.After the tempered stove insulation of sleeve pipe, come out of the stove, through raceway, transport and enter hot sizing stand and thermal straightening machine, enter temperature in >=550 ℃ of hot sizing stand, enter temperature in >=500 ℃ of thermal straightening machine, utilize X ray stress distribution instrument and otch method to record the unrelieved stress≤80MPa of sleeve pipe.Embodiment and comparative example concrete technology parameter and mechanical property contrast are in Table 2.
Table 2 embodiment and comparative example concrete technology parameter and mechanical property contrast (wt%)
The high collapse strength of producing through the method, its critical external compressive resistance squeezes ruins intensity >=115.0MPa, compared with API TR5C3 standard value, exceeds 50%.Adopt the logical corrosive medium simulated oil gas field CO of high temperature and high pressure kettle
2corrosive environment, evaluates band button at CO
2erosion rate in environment, test result shows the erosion rate≤0.25mm/a of sample in simulated environment, and CO does not occur test whole process
2local corrosion., there is not weld seam guttering corrosion in the band button 168h that polarizes in the 3.5%NaCl aqueous solution; Band button corrodes 96h in the saturated 5%NaCl+0.5% acetic acid of hydrogen sulfide mixing solutions, and HIC crackle does not appear in test whole process, and wherein crack-sensitivity rate (CSR), crack length rate (CLR), crack thickness rate (CTR) are zero; Band button is being not less than 85% σ
sunder (yield strength) stress level, in the saturated 5%NaCl+0.5% glacial acetic acid of hydrogen sulfide mixing solutions, corroding 720h, there is not SSCC crackle in test whole process.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (9)
1. a corrosion-resistant high anti-extrusion petroleum casing pipe, is characterized in that, the proportioning of the Chemical Composition of this petroleum casing pipe is: C:0.18～0.30wt%; Si:0.20～0.35wt%; Mn:0.90～1.30wt%; Cr:0～0.50wt%; Ti:0.01～0.07wt%; Mo:0.15～0.35wt%; V:0.01～0.05wt%; Ni:0～0.25wt%; Nb:0～0.05wt%; P :≤0.008wt%; S :≤0.004wt%; Surplus is Fe.
2. a kind of corrosion-resistant high anti-extrusion petroleum casing pipe according to claim 1, is characterized in that also having added in described constituent element B:0.001～0.005wt%; Y:0.002～0.01wt%.
3. petroleum casing pipe as claimed in claim 1 or 2, is characterized in that: the yield strength of described petroleum casing pipe: 861～960MPa; Tensile strength: >=935MPa; Collapsing strength: >=115MPa; 0 ℃ of ballistic work: >=100J; Unrelieved stress :≤80MPa.
4. the preparation method of an anti-corrosion high anti-extrusion petroleum casing pipe, it is characterized in that, in accordance with the following steps: (1) microalloying controlled rolling and controlled cooling steel plate, (2) FFX moulding, (3) high-frequency resistance welding, (4) weld seam rolls and anneal, (5) thermotension tube reducing, (6) are managed modifier treatment, (7) hot size and hot straightening, (8) full pipe flaw detection entirely.
5. preparation method as claimed in claim 4, is characterized in that, described step (1) is that to adopt wall thickness deviation be raw material at the microalloying controlled rolling and controlled cooling steel plate of-2%t～+ 2%t, and the Chemical Composition of steel plate is as follows: C:0.18～0.30wt%; Si:0.20～0.35wt%; Mn:0.90～1.30wt%; Cr:0～0.50wt%; Ti:0.01～0.07wt%; Mo:0.15～0.35wt%; V:0.01～0.05wt%; Ni:0～0.25wt%; Nb:0～0.05wt%; B:0.001～0.005wt%; Y:0.002～0.01wt%; P :≤0.008wt%; S :≤0.004wt%; Surplus is Fe.
6. the preparation method as described in claim 4 or 5, it is characterized in that, during the middle steel-pipe welding of described step (3), V-type angular aperture is set as that 3～5 °, amount of compression are set as 0.3t～0.6t, welding speed is set as 15～30m/min, postwelding carries out inside and outside weld seam burr removing immediately, weld seam rolls and anneal, annealing temperature is 850～1000 ° ℃, makes weld metal zone and periphery smooth.
7. the preparation method as described in claim 4 or 5, it is characterized in that, described step (5) adopts Frequency Induction Heating mode, welded tube is rapidly heated more than the Ac3 temperature of tubing with the heating rate of 20～60 ℃/s, then the speed with 0.5～2.8m/s enters thermotension tube reducing unit tube reducing to the pipe of required specification, weld metal zone and mother metal crystal grain generation dynamic recrystallization, grain fineness number reaches more than 11 grades, and body homogeneous microstructure is consistent.
8. the preparation method as described in claim 4 or 5, is characterized in that, described step (6) is to adopt quenching+high tempering to process, quench and adopt water quenching technology, quenching temperature is 890 ℃～950 ℃, and soaking time is 30～80min, and quenching cooling rate is 40～100 ℃/s; Tempering temperature is 590～700 ℃, and tempering insulation time is 50～120min.
9. the preparation method as described in claim 4 or 5, is characterized in that, in described step (7), and hot size temperature >=550 ℃; Hot straightening temperature >=500 ℃, the external diameter out of roundness < 0.3% of control sleeve pipe, eccentricity < 2%.
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| CN201310111616.1A CN103695786B (en) | 2013-04-01 | A kind of anti-corrosion high anti-extrusion petroleum casing pipe and production method thereof |
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Effective date of registration: 20170524 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China National Petroleum Corporation Address before: 721008, 10 Tan Tan Road, Shaanxi, Baoji Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |
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