CN104057253A - High-strength oil-string casing for shale gas and manufacturing method thereof - Google Patents

High-strength oil-string casing for shale gas and manufacturing method thereof Download PDF

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Publication number
CN104057253A
CN104057253A CN201410270083.6A CN201410270083A CN104057253A CN 104057253 A CN104057253 A CN 104057253A CN 201410270083 A CN201410270083 A CN 201410270083A CN 104057253 A CN104057253 A CN 104057253A
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shale gas
heating
high strength
production string
steel pipe
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黄云
曾理
黄英
滕建明
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Pangang Group Chengdu Steel and Vanadium Co Ltd
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Pangang Group Chengdu Steel and Vanadium Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings

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  • Manufacturing & Machinery (AREA)
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Abstract

The invention provides a high-strength oil-string casing for shale gas and a manufacturing method thereof. The method comprises the following steps: smelting molten steel which comprises 0.1-05% of C, 0.1-0.4% of Si, 0.2-1.5% of Mn, 0.5-1.5% of Cr, 0.1-0.5% of Mo, 0.0025-0.025% of Ti, 0.005-0.05% of Al, 0-0.020% of P, 0-0.010% of S and the balance of Fe and inevitable impurities; carrying out continuous casting so as to obtain a round billet; heating the round billet by virtue of an annular furnace, and carrying out punching, continuous rolling, stretch reducing, cooling, sawing, straightening and flaw detection on the round billet; quenching a steel pipe to 850-950 DEG C by use of water, cooling the steel pipe to room temperature, tempering at a heating temperature ranging from 550 DEG C to 650 DEG C, and carrying out temperature correction after tempering. The oil-string casing has favorable mechanical property and overall use property and is applicable to shale gas horizontal wells.

Description

High strength production string and manufacture method thereof for shale gas
Technical field
The invention belongs to shale gas exploitation and use petroleum casing pipe technical field, specifically, relate to high strength production string and manufacture method thereof for a kind of shale gas.
Background technology
Along with constantly riseing of world energy sources consumption, comprise that the unconventional energy resource of shale gas more and more comes into one's own.Because the reservoir of shale gas reservoir is generally the physical property characteristic of low hole, low-permeability, gas-flow resistance is larger than conventional gas, and all wells all need to implement reservoir fracturing transformation and could exploit out.Shale gas production technique, mainly comprises HDP and multiple fracturing technology, riverfrac treatment technology, multiple fracturing technique and synchronous fracturing technique, so split, adopts the body material of sleeve pipe to have higher requirement.
At present, China's shale gas exploration and development is also at the early-stage, mainly concentrates on the ground such as the Sichuan Basin and periphery thereof, Ordos Basin, Eastern Sag in Liaohe Depression.CNPC Chuan Nan, Dian Qian backlands district preferred Weiyuan, Changning, Zhaotong and rich and smooth-4, Yongchuan favorable block, and South, river piece mainly adopts staged fracturing technology, every mouthful of well is divided into 20 sections, well head pressure 80-100MPa, prospect pit in early stage production string mainly adopts P110 grade of steel, the principal mode that cover damages is that horizontal segment sleeve pipe body squeezes and ruins distortion, to oil field, brings potential safety hazard and larger economic loss.
Summary of the invention
The object of the invention is to solve at least one in above shortcomings in prior art.
For example, one of object of the present invention is to provide a kind of method of high strength production string for shale gas horizontal well of manufacturing.
An aspect of of the present present invention provides the manufacture method of a kind of shale gas with high strength production string.Described manufacture method comprises following steps in sequence: smelting obtains chemical composition and is by weight percentage: C:0.1～0.5%, Si:0.1～0.4%, Mn:0.2～1.5%, Cr:0.5～1.5%, Mo:0.1～0.5%, Ti:0.0025～0.025%, Al:0.005～0.05%, P:0～0.020%, S:0～0.010%, surplus are the target molten steel of Fe and inevitable impurity; Continuous casting makes round base, and wherein, during continuous casting, tundish temperature control is 1520～1545 ℃; Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, aligning and flaw detection, wherein, annular furnace heating and temperature control is 1220～1270 ℃, by tandem rolling, stretch reducing, cooling and aligning, the physical dimension of steel pipe is controlled to be: external diameter tolerance is 0～+ 1.0%, wall thickness tolerance for >=-10%t, body ovality≤0.5%, eccentricity≤14%, flexibility control for total length flexibility≤0.2%L, pipe end flexibility be 1.5m length range≤2.5mm; After steel pipe is heated to 850～950 ℃, water quenches, and steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature scope is 550～650 ℃, carries out temperature correction after tempering.
In an exemplary embodiment of manufacture method of the present invention, the composition of described target molten steel is preferably: C:0.25～0.35%, Si:0.15～0.35%, Mn:0.45～0.85%, Cr:0.8～1.2%, Mo:0.25～0.35%, Ti:0.008～0.025%, Al:0.01～0.05%, P:0.005～0.018%, S:0.001～0.005%, Ni≤0.20%, Cu≤0.20%, V≤0.03%, surplus are Fe and inevitable impurity.
In an exemplary embodiment of manufacture method of the present invention, describedly steel pipe is heated to 850～950 ℃ can realizes by three heating periods, wherein, the heating and temperature control of the first heating period is 850～900 ℃, the heating and temperature control of the second heating period is 880～920 ℃, and the heating and temperature control of soaking zone is 920～950 ℃.
In an exemplary embodiment of manufacture method of the present invention, the type of cooling that described quenching can adopt outer spray to add interior axial flow is carried out, wherein, and outer spray time 10～50 seconds, 10～50 seconds interior axial flow time; Outer water spray 500～2000m 3/ h, the interior axial flow water yield 200～1000m 3/ h.
Another object of the present invention is to provide a kind of shale gas horizontal well high strength production string that is suitable for.
Another aspect of the present invention provides a kind of shale gas high strength production string.Described shale gas by the chemical composition of high strength production string is by weight percentage: C:0.1～0.5%, Si:0.1～0.4%, Mn:0.2～1.5%, Cr:0.5～1.5%, Mo:0.1～0.5%, Ti:0.0025～0.025%, Al:0.005～0.05%, P:0～0.020%, S:0～0.010%, surplus is Fe and inevitable impurity, and described shale gas is 900～1030MPa with the yield strength Rt0.65 of high strength production string, tensile strength Rm is >=950MPa, percentage elongation >=13%, impact flexibility: horizontal full-scale >=60J, longitudinal full-scale >=80J, body collapse resistance >=142.4Mpa, interior yield pressure >=137.1Mpa, bonding strength >=4368KN.
In an exemplary embodiment of production string of the present invention, described shale gas is preferably by weight percentage by the chemical composition of high strength production string: C:0.25～0.35%, Si:0.15～0.35%, Mn:0.45～0.85%, Cr:0.8～1.2%, Mo:0.25～0.35%, Ti:0.008～0.025%, Al:0.01～0.05%, P:0.005～0.018%, S:0.001～0.005%, Ni≤0.20%, Cu≤0.20%, V≤0.03%, surplus are Fe and inevitable impurity.
Compared with prior art, beneficial effect of the present invention comprises provides a kind of high strength production string and manufacture method thereof for shale gas horizontal well that be suitable for, and described production string (for example has good mechanical property, yield strength (Rt0.65) 900～1030MPa (yield strength is 125000psi level), tensile strength (Rm) >=950MPa, percentage elongation >=13%, impact flexibility: horizontal full-scale >=60J, longitudinal full-scale >=80J, hardness allows to change: body 3.0HRC, box cupling 5.0HRC) and whole serviceability (for example, body collapse resistance >=142.4Mpa, interior yield pressure >=137.1Mpa, bonding strength >=4368KN).
The specific embodiment
Hereinafter, in connection with exemplary embodiment, describe high strength production string and manufacture method thereof for shale gas of the present invention in detail.
Shale gas of the present invention comprises following steps in sequence by the manufacture method of high strength production string: smelting obtains chemical composition and is by weight percentage: C:0.1～0.5%, Si:0.1～0.4%, Mn:0.2～1.5%, Cr:0.5～1.5%, Mo:0.1～0.5%, Ti:0.0025～0.025%, Al:0.005～0.05%, P:0～0.020%, S:0～0.010%, surplus are the target molten steel of Fe and inevitable impurity; Continuous casting makes round base, and wherein, during continuous casting, tundish temperature control is 1520～1545 ℃; Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, sawing, aligning and flaw detection, wherein, annular furnace heating and temperature control is 1220～1270 ℃, by tandem rolling, stretch reducing, cooling and aligning, the physical dimension of steel pipe is controlled to be: external diameter tolerance is 0～+ 1.0%, wall thickness tolerance for >=-10%t, body ovality≤0.5%, eccentricity≤14%, flexibility control for total length flexibility≤0.2%L, pipe end flexibility be 1.5m length range≤2.5mm; After steel pipe is heated to 850～950 ℃, water quenches, and steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature scope is 550～650 ℃, carries out temperature correction after tempering.Wherein, temperature correction step can be controlled the temperature that steel pipe temperature correction finishes and be greater than 400 ℃.
It is steel grade that shale gas of the present invention adopts Cr-Mo with high strength production string on Composition Design, adds Mo element can improve quenching degree and temper resistance; Add the Ti can crystal grain thinning.
In manufacture method of the present invention, the step of smelting target molten steel can adopt electric furnace and LF stove to carry out.For example, during electric furnace steel making, deoxidier addition: CaBaAlSi or CaAlSi1.5～2.5kg/t, Al piece addition 2.0～3.5kg/t.LF refined synthetic slag consumption: >=1000Kg, to guarantee arc-covering slag operation, according to the mobility of slag and the quantity of slag, can add 0～200kg lime and fluorite, guarantee that the slag quantity of slag is enough, basicity and mobility suitable.Tap in first 5～10 minutes and add FeTi0.8kg/t; LF stove refining end, feeds Ca-Si silk 0.6～0.8kg/t or pure Ca line 0.10～0.15kg/t before quiet blowing; Quiet time >=the 15min that blows; Tapping temperature: 1575～1595 ℃.
In manufacture method of the present invention, tube rolling (comprising tandem rolling and stretch reducing) and aligning process add to body geometrical dimension tolerances the system of keeping under strict control, external diameter tolerance: 0～+ 1.0%; Wall thickness tolerance: >=-10%t (that is, require the actual wall thickness of steel pipe should be more than or equal to nominal wall thickness 90% and more than); Body ovality≤0.5%, eccentricity≤14%; Flexibility: (implication of L is total length flexibility≤0.2%L: steel pipe physical length, unit: m); Pipe end flexibility: 1.5m length range≤2.5mm, thus can effectively guarantee that steel pipe has good anti-squeezing and ruins, resists the interior performance of pressing.
Quenching-and-tempering process is to quench after steel pipe is heated to 850～950 ℃, and steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature scope is 550～650 ℃, carries out temperature correction after tempering.Quench and use shrend, the spray+interior axial flow type of cooling outside adopting on quenching unit, outer spray time 10～50 seconds, 10～50 seconds interior axial flow time; Outer water spray 500～2000m 3/ h, the interior axial flow water yield 200～1000m 3/ h.Preferably, steel pipe is heated to the process of 850～950 ℃: steel pipe heats and is divided into three sections and carries out in glowing furnace, heating one section of heating controls by 850～900 ℃ of lower temperatures, heat two sections by 880～920 ℃ of controls, soaking zone is by 920～950 ℃ of controls, by thermograde, heat, steel pipe oxidation is not serious and pipe temperature is even.
The present invention is directed to Cr, chemical composition that Mo alloying element content is higher, for fear of steel pipe, produce the measure that serious iron scale takes and comprise: optimize glowing furnace furnace temperature system, segmentation control valve temperature, prevents that steel pipe is at bringing-up section over oxidation; During temperature correction, the temperature that requires steel pipe to go out temperature correction machine should be greater than 400 ℃, and the oxide skin major part of outer surface of steel tube after temperature correction is come off.Preferably, after temperature correction finishes, the steel pipe that makes temperature be not less than 400 ℃ rolls and subsequently this steel pipe is carried out to high-pressure blast through chain bed and purges online, so that oxide skin further comes off, thereby significantly improves the surface quality of steel pipe.
In addition, safe and reliable for guaranteeing oil bushing threaded connector, while specifically using, require all phosphatization processing of coupling inner thread surface, and external screw thread does not allow to exist black top screw thread from pipe end within the scope of complete thread minimum length Lc.
Below in conjunction with concrete example, the specific embodiment of the present invention is further described, does not therefore limit the present invention among the scope of concrete example.
By API5CT standard Q125-1PSL2 grade of steel production specification, it is 139.7 * 12.7mm shale gas horizontal well high strength production string.The concrete composition of steel grade is in Table 1.
The technological process of production: electric furnace steel making → Ф 200 continuous casting billets → tandem rolling unit hot rolling → stretch reducing → cooling → aligning → magnetic leakage detection → modified heat treatment → temperature correction → flaw detection → car silk → hydraulic pressure, latus rectum, inspection, packing.In above-mentioned technological process, also can, according to specification requirement, between cooling and aligning step, multiple length sawing step be set.
Example 1
Electric furnace steel making: raw material are: the molten iron of low As, Sn harmful element and low S, the pig iron and a class waste steel ingredient, mixed carbon comtent is controlled by 1.6～2.0%.Electric furnace steel tapping temperature is controlled: 1620～1660 ℃.LF refining: tap in first 5～10 minutes and add FeTi0.8kg/t.By electric furnace smelting and the refining of LF stove, obtain the target molten steel of composition as shown in table 1.
Continuous casting tundish temperature is controlled: 1525 ± 5 ℃.
Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, sawing, aligning and flaw detection.1230 ± 5 ℃ of annular furnace heating-up temperatures.The physical dimension of steel pipe is controlled: external diameter tolerance is 0～+ 1.0%, wall thickness tolerance for >=-8%t, body ovality≤0.4%, eccentricity≤12%, flexibility control for total length flexibility≤0.2%L, pipe end flexibility be 1.5m length range≤2.0mm.After temperature correction, outer surface of steel tube quality is good.
On continous way walking-beam furnace production line, carry out modified heat treatment, quenching heating process realized by three heating periods, wherein, the heating and temperature control of the first heating period is 875 ± 5 ℃, the heating and temperature control of the second heating period is 900 ± 5 ℃, and the heating and temperature control of soaking zone is 940 ± 5 ℃, and quench cooled is used shrend, spray+interior axial flow the type of cooling outside adopting on quenching unit, first starts axial flow in outer spray, rear beginning when cooling; In FEFO, axial flow, rear end spray outward.Outer spray time 30 seconds, 20 seconds interior axial flow time.Outer water spray 2000m 3/ h, interior axial flow water yield 700m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature is 570 ± 10 ℃.After tempering, carry out temperature correction, it is 510 ± 10 ℃ that control temperature correction finishes rear steel pipe temperature, with by the rolling of chain bed and online purging of high-pressure blast, oxide skin further being come off.
Mechanical property after Steel Pipe Heat is processed is in Table 2, and all meets standard-required.
The chemical composition (wt%) of table 1 example 1 to 3
The mechanical property of the steel pipe of table 2 example 1 to 3
Show Yield strength Tensile strength Extend Impact Impact Impact All Firmness change
Example MPa MPa Rate % Value 1 Value 2 Value 3 Value J Value HRC
1A 975 1060 20.5 71.7 76.1 73.0 74 1.5
1B 990 1030 21.0 78.2 77.9 78.3 78 1.2
1C 950 1030 24.5 79.2 76.5 74.4 77 1.0
2A 940 1030 25.5 78.4 81.9 79.9 80 2.0
2B 965 1040 24.5 82.4 76.4 78.3 79 0.9
2C 985 1060 23.0 101 91.8 98.3 97 1.3
3A 985 1080 24.5 82.1 76.9 73.5 78 1.4
3B 980 1050 25.5 69.1 82.6 78.3 77 1.3
3C 1000 1070 24.0 73.9 72.5 71.9 73 1.6
In table 2, A, B, C represent respectively three mechanics property analysis samples that same stove lot number is got.
Example 2
The target molten steel composition of this example is as shown in table 1.
Continuous casting tundish temperature is controlled: 1540 ± 5 ℃.
Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, sawing, aligning and flaw detection.1250 ± 5 ℃ of annular furnace heating-up temperatures.The physical dimension of steel pipe is controlled: external diameter tolerance is 0～+ 0.9%, wall thickness tolerance for >=-9%t, body ovality≤0.5%, eccentricity≤13%, flexibility control for total length flexibility≤0.15%L, pipe end flexibility be 1.5m length range≤2.3mm.After temperature correction, outer surface of steel tube quality is good.
On continous way walking-beam furnace production line, carry out modified heat treatment, quenching heating process realized by three heating periods, wherein, the heating and temperature control of the first heating period is 860 ± 5 ℃, the heating and temperature control of the second heating period is 880 ± 5 ℃, and the heating and temperature control of soaking zone is 920 ± 5 ℃, and quench cooled is used shrend, spray+interior axial flow the type of cooling outside adopting on quenching unit, first starts axial flow in outer spray, rear beginning when cooling; In FEFO, axial flow, rear end spray outward.Outer spray time 40 seconds, 35 seconds interior axial flow time.Outer water spray 1500m 3/ h, interior axial flow water yield 400m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature is 590 ± 10 ℃.After tempering, carry out temperature correction, it is 520 ± 10 ℃ that control temperature correction finishes rear steel pipe temperature, with by the rolling of chain bed and online purging of high-pressure blast, oxide skin further being come off.
Mechanical property after Steel Pipe Heat is processed is in Table 2, and all meets standard-required.
Example 3
The target molten steel composition of this example is as shown in table 1.
Continuous casting tundish temperature is controlled: 1530 ± 5 ℃.
Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, sawing, aligning and flaw detection.1230 ± 5 ℃ of annular furnace heating-up temperatures.The physical dimension of steel pipe is controlled: external diameter tolerance is 0～+ 0.9%, wall thickness tolerance for >=-8%t, body ovality≤0.4%, eccentricity≤14%, flexibility control for total length flexibility≤0.15%L, pipe end flexibility be 1.5m length range≤2.4mm.After temperature correction, outer surface of steel tube quality is good.
On continous way walking-beam furnace production line, carry out modified heat treatment, quenching heating process realized by three heating periods, wherein, the heating and temperature control of the first heating period is 880 ± 5 ℃, the heating and temperature control of the second heating period is 910 ± 5 ℃, and the heating and temperature control of soaking zone is 940 ± 5 ℃, and quench cooled is used shrend, spray+interior axial flow the type of cooling outside adopting on quenching unit, first starts axial flow in outer spray, rear beginning when cooling; In FEFO, axial flow, rear end spray outward.Outer spray time 48 seconds, 40 seconds interior axial flow time.Outer water spray 1400m 3/ h, interior axial flow water yield 600m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature is 600 ± 10 ℃.After tempering, carry out temperature correction, it is 530 ± 10 ℃ that control temperature correction finishes rear steel pipe temperature, with by the rolling of chain bed and online purging of high-pressure blast, oxide skin further being come off.
Mechanical property after Steel Pipe Heat is processed is in Table 2, and all meets standard-required.
By the mechanical performance of high strength production string, by API Spec5CT (the 9th edition), standard-required samples the shale gas horizontal well that method of the present invention is obtained, sample preparation, the index that its mechanical property reaches is as follows: yield strength (Rt0.65) 900～1030MPa (yield strength is 125000psi level), tensile strength (Rm) >=950MPa, percentage elongation >=13%, impact flexibility: horizontal full-scale >=60J, longitudinal full-scale >=80J, hardness allows to change: body 3.0HRC, box cupling 5.0HRC.
The shale gas horizontal well that method of the present invention obtains is as follows with the whole using property data of high strength production string finished product sleeve pipe: body collapse resistance >=142.4Mpa, interior yield pressure >=137.1Mpa, bonding strength >=4368KN.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.

Claims (7)

1. a manufacture method for high strength production string for shale gas, is characterized in that, described manufacture method comprises following steps in sequence:
Smelting obtains chemical composition: C:0.1～0.5%, Si:0.1～0.4%, Mn:0.2～1.5%, Cr:0.5～1.5%, Mo:0.1～0.5%, Ti:0.0025～0.025%, Al:0.005～0.05%, P:0～0.020%, S:0～0.010%, surplus are the target molten steel of Fe and inevitable impurity;
Continuous casting makes round base, and wherein, during continuous casting, tundish temperature control is 1520～1545 ℃;
Circle base is sequentially carried out to annular furnace heating, perforation, tandem rolling, stretch reducing, cooling, aligning and flaw detection, wherein, annular furnace heating and temperature control is 1220～1270 ℃, by tandem rolling, stretch reducing, cooling and aligning, the physical dimension of steel pipe is controlled to be: external diameter tolerance is 0～+ 1.0%, wall thickness tolerance for >=-10%t, body ovality≤0.5%, eccentricity≤14%, flexibility control for total length flexibility≤0.2%L, pipe end flexibility be 1.5m length range≤2.5mm;
After steel pipe is heated to 850～950 ℃, water quenches, and steel pipe carries out tempering after being chilled to room temperature, and tempering heating-up temperature scope is 550～650 ℃, carries out temperature correction after tempering.
2. the manufacture method of high strength production string for shale gas according to claim 1, it is characterized in that, the composition of described target molten steel is: C:0.25～0.35%, Si:0.15～0.35%, Mn:0.45～0.85%, Cr:0.8～1.2%, Mo:0.25～0.35%, Ti:0.008～0.025%, Al:0.01～0.05%, P:0.005～0.018%, S:0.001～0.005%, Ni≤0.20%, Cu≤0.20%, V≤0.03%, surplus are Fe and inevitable impurity.
3. the manufacture method of high strength production string for shale gas according to claim 1, it is characterized in that, describedly steel pipe is heated to 850～950 ℃ by three heating periods, realizes, wherein, the heating and temperature control of the first heating period is 850～900 ℃, the heating and temperature control of the second heating period is 880～920 ℃, and the heating and temperature control of soaking zone is 920～950 ℃.
4. the manufacture method of high strength production string for shale gas according to claim 1, is characterized in that, the type of cooling that described quenching adopts outer spray to add interior axial flow is carried out, wherein, and outer spray time 10～50 seconds, 10～50 seconds interior axial flow time; Outer water spray 500～2000m 3/ h, the interior axial flow water yield 200～1000m 3/ h.
5. the manufacture method of high strength production string for shale gas according to claim 1, is characterized in that, the temperature that the temperature correction of described temperature correction step control steel pipe finishes is greater than 400 ℃.
6. a shale gas high strength production string, it is characterized in that, described shale gas by the chemical composition of high strength production string is by weight percentage: C:0.1～0.5%, Si:0.1～0.4%, Mn:0.2～1.5%, Cr:0.5～1.5%, Mo:0.1～0.5%, Ti:0.0025～0.025%, Al:0.005～0.05%, P:0～0.020%, S:0～0.010%, surplus is Fe and inevitable impurity, and described shale gas is 900～1030MPa with the yield strength Rt0.65 of high strength production string, tensile strength Rm is >=950MPa, percentage elongation >=13%, impact flexibility: horizontal full-scale >=60J, longitudinal full-scale >=80J, body collapse resistance >=142.4Mpa, interior yield pressure >=137.1Mpa, bonding strength >=4368KN.
7. shale gas according to claim 6 high strength production string, it is characterized in that, described shale gas by the chemical composition of high strength production string is by weight percentage: C:0.25～0.35%, Si:0.15～0.35%, Mn:0.45～0.85%, Cr:0.8～1.2%, Mo:0.25～0.35%, Ti:0.008～0.025%, Al:0.01～0.05%, P:0.005～0.018%, S:0.001～0.005%, Ni≤0.20%, Cu≤0.20%, V≤0.03%, surplus are Fe and inevitable impurity.
CN201410270083.6A 2014-06-16 2014-06-16 High-strength oil-string casing for shale gas and manufacturing method thereof Pending CN104057253A (en)

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CN111485163A (en) * 2020-04-30 2020-08-04 天津钢管制造有限公司 125ksi casing pipe suitable for volume fracturing shale gas/oil and preparation method thereof
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CN112981260A (en) * 2021-02-08 2021-06-18 上海振华港机重工有限公司 Container crane wheel steel, container crane wheel and preparation method of container crane wheel steel
CN115584431A (en) * 2021-07-05 2023-01-10 中国石油天然气集团有限公司 High-performance anti-collapse casing pipe for shale gas well and machining method

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