CN105177453A - High-strength and high-performance coiled tubing and manufacturing method thereof - Google Patents
High-strength and high-performance coiled tubing and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses high-strength and high-performance coiled tubing and a manufacturing method thereof. The manufacturing method comprises the following steps that firstly, molten iron serves as main raw materials, passes through a top and bottom combined blown rotary furnace, is subjected to argon-oxygen decarbonization, ladle refining and external refining and is poured into a continuous cast billet, and the cast billet is cast into a plate blank and finally manufactured into a coiled plate with the length larger than 500 m; secondly, the coiled plate is longitudinally sheared and subjected to butt joint; thirdly, the straight-seam ultra-high coiled tubing is manufactured; and fourthly, heat treatment needs to be conducted on high-frequency welding lines and a whole tubing body. According to the manufacturing method of the ultrahigh-strength coiled tubing, the yield strength of the manufactured coiled tubing ranges from 689 MPa to 965 MPa, the tensile strength ranges from 758 MPa to 1,034 MPa, and the hardness is smaller than or equal to 28 HRC. The high-strength and high-performance coiled tubing has the beneficial effects of being high in strength, torque and pressure resistance and long in service life, and is suitable for being applied to deep wells and ultra-deep wells and suitable for high-pressure operation at the same time. In the horizontal fracturing operation process, the number of layers fractured at a time can be dozens, the operation efficiency is high, and the output of oil and gas wells can be effectively increased.
Description
Technical field:
The invention belongs to oil and gas tubing technical field, relate to a kind of superstrength continuous-tube manufacture method with performances such as high moment of torsion, high resistance to compression, high life, especially a kind of high-strength high-performance continuous-tube and manufacture method thereof.
Background technology:
Continuous-tube (CT, Coiledtubing) is a kind of high strength, high-ductility the joint length with certain corrosion resistance can reach the Novel oil gas tubing of thousands of meters.Because continuous-tube technology has a series of technological merit and the operation advantages such as efficiency is high, cost is low, scope of work is wide, floor space is little, therefore continuous-tube by playing more and more important effect in exploration of oil and gas field, exploitation, operation, volume increase, has broad application prospects.
At present, along with the increasing number that China's oil-gas exploration and development difficulty strengthens and unconventional petroleum resources is developed, many complex hydrocarbon well engineering roadblocks will display.Such as Tarim Basin, its Oil/gas Well integrates ultra-deep, ultra-high voltage, ultrahigh-temperature, is further improved the intensity of continuous-tube, the requirement of resisting over-all propertieies such as bursting.And the key that the performance of enterprises and competitive power reach stable yields, volume increase improves in the exploratory development Shi Ge oil company of Deep Oil And Gas Exploration resource.For the continuous-tube of 50.8 × 4.44mm, be less than 689MPa (100000psi) in yield strength, when payload security coefficient 0.8, its single continuous-tube maximum length is 7098m, and depth of falling well also can not exceed this length.Conventional continuous-tube low strength, can not adapt to above-mentioned deep-well, ultra deep well and strong well operation.Superstrength continuous-tube relies on higher intensity, and the ultimate load that can bear is also higher, can meet the use in deep-well, ultra deep well, and in deep-well, ultra deep well, operation is with the obvious advantage.So in the face of constantly increasing in exploitation of oil-gas field middle-deep well, ultra deep well quantity, need the continuous-tube of a large amount of high strength.
Meanwhile, in order to improve production efficiency, horizontal well is adopted in a large number both at home and abroad.Superstrength continuous-tube has a clear superiority in horizontal well acid fracturing operation than regular tenacity continuous-tube: in superstrength continuous-tube is anti-, pressure is high, and Anti-collapse pressure is large, is applicable to carrying out operations involving high pressure.Because continuous-tube intensity is high, the number of plies of lower tubular column successively pressure break is many, and can reach tens substratums, operating efficiency is high, can effectively improve oil gas well yield.So application has the frac job that the advantage superstrength continuous-tubes such as intensity is high, moment of torsion is high, fatigue lifetime is high carry out horizontal well, the significantly lifting of operating efficiency can be realized.
In addition, continuous-tube needs viscous deformation repeatedly in operation, and fatigue lifetime is its main performance index, advantage that superstrength continuous-tube relies on that intensity is high, moment of torsion is high, resistance to compression is high etc., and its low cycle fatigue work-ing life is far above low strength continuous-tube.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of superstrength continuous-tube manufacture method with performances such as high moment of torsion, high resistance to compression, high life is provided.By reasonable alloy designs, the technique such as refining, control bundle, pickling is adopted to prepare connecting pipes roll bending.Utilize special sheet material docking technique to connect the continuous-tube roll bending after slitting, adopt row-roll forming process and high frequency induction welding (HFW) technology to carry out tubulation, and produce superstrength continuous-tube by follow-up thermal treatment.
The object of the invention is to solve by the following technical programs:
A kind of high-strength high-performance continuous-tube, yield strength 689-965MPa, the tensile strength 758-1034MPa of described continuous-tube, unit elongation >=13%, external diametrical extent are Φ 25.4-Φ 88.9mm, wall thickness range is 2.4-6.35mm, length range is 1000-10000m, hardness≤28HRC.
According to mass percent, the chemical composition of described continuous-tube is as follows: C0.12-0.16%, Mn0.7-2.0%, P≤0.002%, S≤0.003%, Si0.4-0.45%, Cr1.0-1.5%, Ni0.36-0.8%, Cu0.26-0.4%, Mo0.45-0.5%, Al0.04-0.05%, Ti0.03-0.05%, V0.05-0.08%, Nb0.02-0.06%, Fe surplus.
The manufacture method of described continuous-tube, in accordance with the following steps:
(1) using molten iron as main raw material, through top end compound blow converter and argon oxygen decarburization, ladle refining and external refining, and pour into continuously cast bloom; Strand is cast slab, finally makes length more than 500 meters of roll bendings;
(2) roll bending slitting and docking;
(3) vertical masonry joint superstrength continuous-tube is manufactured;
(4) need to heat-treat respectively to ratio-frequency welding weld seam and full body.
Described step (1) is: by slab heating temperature to 1050-1250 DEG C, continuous casting technology application induction stirring is adopted to control to cast the slab of 20-60mm thickness, finishing temperature: 820-880 DEG C, rolled into the hot-rolled sheet of 2.4-6.35mm thickness, coiling temperature 500-600 DEG C, finally makes length more than 500 meters of roll bendings.
Described step (2) is: by the superstrength roll bending for preparing according to continuous-tube specification requirement, be cut into the steel band of 80-300mm by slitting line; For meeting continuous-tube length requirement, need by steel band spreading; Steel band spreading adopts the method for 45 ° of inclined weld docking; When docking, after at 45 ° for the end machining of two steel bands in front and back, reasonable finished edge, groove is I type, V-type or U-shaped, plasma landfilling area or argon arc welding method is adopted to be welded, when after weld seam cooling, trimming surface, then reheats more than AC3 temperature by weld dimensions, insulation 10-30s, adopt the pressure of 5-9 ton, weld dimensions is carried out high temperature rolling, weld dimensions naturally cooling after rolling; After cooling temperature is less than 150 DEG C, weld dimensions is reheated 600-800 DEG C and anneal.
Described step (2) is: according to external diameter and the wall thickness requirement of final continuous-tube, adopt the method on milling limit that I type, V-type or X-type groove are dug in band steel side, accurate control strip width and edges of boards verticality, adopt UOE row-roll forming process method to control steel belt molding; Utilize high frequency induction welding connection technology, accurately control angular aperture and amount of compression and welding setting, longitudinal measure is carried out to shaping steel band, guarantees welding quality; Control the amount of compression of weld seam at 1.0-2.5mm, angular aperture θ controls at 4-8 °, and welding speed is 15-25m/min; Being welded into caliber is Φ 25.4-Φ 88.9mm, and wall thickness is the vertical masonry joint superstrength continuous-tube of 2.4-6.35mm.
Described step (2) is: after having welded, weld seam is locally heated to more than AC3, and adopts extrusion roll to adopt the mode butt welded seam of sizing to apply certain deformation quantity to its tubing, subsequently to its quenching; After having quenched, adopted intermediate frequency or other rapid heating modes, homogeneous tube is heated to two-phase region, carries out controlled cooling model after heat penetration to it, elimination weld seam is bad eliminates tissue, reduction hardness, improves overall performance; Weld seam thermal treatment temp is: 850-960 DEG C, full body thermal treatment temp 600-850 DEG C.
A kind of superstrength of the present invention (yield strength 689-965MPa, tensile strength 758-1034MPa hardness≤28HRC.) continuous-tube and manufacture method.The technical scheme adopted is:
(1) superstrength continuous-tube sheet material design: sheet material design adopts low-carbon micro steel-alloy design system, smelt according to following chemical component weight per-cent, be cast into slab: according to mass percent, the chemical composition of described continuous-tube is as follows: C0.12-0.16%, Mn0.7-2.0%, P≤0.002%, S≤0.003%, Si0.4-0.45%, Cr1.0-1.5%, Ni0.36-0.8%, Cu0.26-0.4%, Mo0.45-0.5%, Al0.04-0.05%, Ti0.03-0.05%, V0.05-0.08%, Nb0.02-0.06%, Fe surplus.
Using molten iron as main raw material, through top end compound blow converter and argon oxygen decarburization (AOD) and ladle refining and external refining, the composition quality percentage ratio of molten steel reaches above-mentioned requirements and can tap, and pours into continuously cast bloom.By slab heating temperature to 1050-1250 DEG C, continuous casting technology application induction stirring is adopted to control to cast the slab of 20-60mm thickness, finishing temperature: 820-880 DEG C, rolled into the hot-rolled sheet of 2.4-6.35mm thickness, coiling temperature 500-600 DEG C, finally make length more than 500 meters, thickness meets the coiled material of application requiring, wherein, thickness can with the regular change of length.
(2) roll bending slitting and docking: by the superstrength roll bending for preparing according to continuous-tube specification requirement, be cut into the steel band of 80-300mm by slitting line.For meeting continuous-tube length requirement, need by steel band spreading.Steel band spreading adopts the method for 45 ° of inclined weld docking.When docking, after at 45 ° for the end machining of two steel bands in front and back, reasonable finished edge (I type, V-type or U-shaped), adopts plasma landfilling area or argon arc welding method to be welded, and required welding wire is the welding wire of special development.When after weld seam cooling, trimming surface, then reheats more than AC3 temperature by weld dimensions, and insulation 10-30s, adopts the pressure of 5-9 ton, weld dimensions is carried out high temperature rolling, weld dimensions naturally cooling after rolling.After cooling temperature is less than 150 DEG C, weld dimensions is reheated 600-800 DEG C and anneal
(3) according to external diameter and the wall thickness requirement of final continuous-tube, adopt the method on milling limit that I type, V-type or X-type groove are dug in steel side, accurately control strip width and edges of boards verticality, adopt UOE row-roll forming process method to control steel belt molding.Utilize high frequency induction welding connection technology, accurately control angular aperture and amount of compression and welding setting, longitudinal measure is carried out to shaping steel band, guarantees welding quality.Control the amount of compression of weld seam at 1.0-2.5mm, angular aperture θ controls at 4-8 °, and welding speed is 15-25m/min.Being welded into caliber is Φ 25.4-Φ 88.9mm, and wall thickness is the vertical masonry joint superstrength continuous-tube of 2.4-6.35mm.
(4) in order to ensure the integral hardness of continuous-tube, need to heat-treat respectively to ratio-frequency welding weld seam and full body.In order to improve weldquality, after having welded, weld seam is locally heated to more than AC3, and has adopted extrusion roll to adopt the mode butt welded seam of sizing to apply certain deformation quantity to its tubing, subsequently to its quenching; After having quenched, adopt intermediate frequency or other rapid heating modes, homogeneous tube has been heated to two-phase region, after heat penetration, controlled cooling model is carried out to it, thus reached and eliminate that weld seam is bad eliminates tissue, reduction hardness, improve the object of overall performance.Weld seam thermal treatment temp is: 850-960 DEG C, full body thermal treatment temp 600-850 DEG C.
Beneficial effect of the present invention is: superstrength continuous-tube manufacture method of the present invention, the continuous-tube yield strength 689-965MPa of manufacture, tensile strength 758-1034MPa hardness≤28HRC.There is the characteristic that intensity is high, moment of torsion is high, resistance to compression is high, the life-span is high, be adapted at applying in deep-well, ultra deep well, be applicable to carrying out operations involving high pressure simultaneously.When horizontal fractures operation, a pressure break number of plies can reach ten multilayers, and operating efficiency is high, can effectively improve oil gas well yield.
Embodiment:
Below the present invention is described in further detail:
According to the requirement of above-mentioned roll bending chemical composition, be equipped with the continuous-tube roll bending of two kinds of chemical compositions, a group element mass percent is high, and a group element mass percent is low, carries out the manufacture of superstrength continuous-tube respectively.
Two kinds of embodiment manufactures be all superstrength continuous-tube.
The main manufacturing steps that the roll bending that element massfraction is high manufactures superstrength continuous-tube is as follows:
One, superstrength continuous-tube roll bending is prepared
Using molten iron as main raw material, through top end compound blow converter and argon oxygen decarburization (AOD) and ladle refining furnace refining, the composition quality percentage ratio of molten steel reaches following requirement and can tap, and pours into continuously cast bloom.
According to mass percent, the chemical composition of described continuous-tube is as follows: C0.15%, Mn1.5%, P≤0.002%, S≤0.003%, Si0.45%, Cr1.4%, Ni0.7%, Cu0.32%, Mo0.48%, Al0.05%, Ti0.04%, V0.07%, Nb0.05%, Fe surplus.
Continuous casting technology application induction stirring is adopted to control to cast the slab of 20-60mm thickness, reheat to about 1100 DEG C, thickness is 4.44mm, width is the hot-rolled sheet of 1180mm to adopt hot strip mill to be rolled into by thermomechanical Controlling Technology (TMPC), pass through suitable controlled cooling model again, form superstrength continuous-tube roll bending, after eventually passing pickling, detection, be curled into roll bending for tubulation through tension force crimping machine.
Two, superstrength continuous-tube preparation
1, roll bending slitting and steel band spreading
The continuous-tube roll bending prepared is cut into the steel band of 157mm by slitting line.For meeting continuous-tube length requirement, steel band being carried out the butt welding of plate plate, by 45 ° of inclined weld modes, steel band being coupled together.By at 45 ° for the end machining of two steel bands in front and back, adopt the mode of plasma weldering to weld, welding whole process adopts the nitrogen of purity >=99.7% as shielding gas, under continuous gas protection, carry out the butt welding of plate plate; After the cooling of weldering cutting edge of a knife or a sword, weld seam is carried out heating and rolling process, rapidly weld seam is heated to 750 DEG C, insulation 20s, extrude with roll butt welded seam, squeeze pressure is about 7 tons.Weld seam is reheated 700 DEG C after being cooled to temperature to be less than 150 DEG C by the weld seam after rolling, naturally cooling in air.
2, continuous-tube shaping with weld
Steel band edges of boards adopt milling limit method to be V-type by edge milling, accurately control strip width and edges of boards verticality; UOE row-roll forming process method is adopted to control steel belt molding; Adopt hight frequency welding technology welding continuous-tube pipe, weld fast 18m/min, frequency 380KHz, power 170Kw, amount of compression are at 1.5mm, and angular aperture θ controls at 6 °.Being welded into caliber is Φ 50.8mm, and wall thickness is the vertical masonry joint electricresistance welded steel pipe of 4.44mm.
3, weld seam thermal treatment
Postwelding strikes off the outer burr of tube wall, and by Intermediate Frequency Induction Heating Equipment, weld seam is heated to rapidly 940 DEG C, controlling water-cooled temperature is subsequently 25 DEG C, makes weld seam temperature about 450 DEG C carry out water-cooled, has obtained good Weld Performance.
4, full body thermal treatment
In order to eliminate unrelieved stress after tubulation, body mother metal produces good structure property, will medium-frequency heating system be utilized to be heated to 760 DEG C to the full body of continuous-tube, then carries out water-cooled.
5, the continuous crisping of superstrength continuous-tube
Be wound on the reel of suitable core diameter by reeling machine, continuous seepage prepares 3500m superstrength continuous-tube, so that transport and use.
6, the salient features of superstrength continuous-tube
Yield strength is 905MPa, and tensile strength is 985MPa, and unit elongation reaches 20%, and hardness is less than 28HV.
The main manufacturing steps that the roll bending that element massfraction is low manufactures superstrength continuous-tube is as follows:
One, superstrength continuous-tube roll bending is prepared
Using molten iron as main raw material, through top end compound blow converter and argon oxygen decarburization (AOD) and ladle refining furnace refining, the composition quality percentage ratio of molten steel reaches following requirement and can tap, and pours into continuously cast bloom.
According to mass percent, the chemical composition of described continuous-tube is as follows: C0.12%, Mn0.8%, P≤0.0015%, S≤0.003%, Si0.4%, Cr1.1%, Ni0.4%, Cu0.28%, Mo0.45%, Al0.04%, Ti0.04%, V0.06%, Nb0.03%, Fe surplus.
Continuous casting technology application induction stirring is adopted to control to cast the slab of 20-60mm thickness, reheat to about 1100 DEG C, thickness is 4.44mm, width is the hot-rolled sheet of 1180mm to adopt hot strip mill to be rolled into by thermomechanical Controlling Technology (TMPC), pass through suitable controlled cooling model again, form superstrength continuous-tube roll bending, after eventually passing pickling, detection, be curled into roll bending for tubulation through tension force crimping machine.
Two, superstrength continuous-tube preparation
1, roll bending slitting and steel band spreading
The continuous-tube roll bending prepared is cut into the steel band of 157mm by slitting line.For meeting continuous-tube length requirement, steel band being carried out the butt welding of plate plate, by 45 ° of inclined weld modes, steel band being coupled together.By at 45 ° for the end machining of two steel bands in front and back, adopt the mode of plasma weldering to weld, welding whole process adopts the nitrogen of purity >=99.7% as shielding gas, under continuous gas protection, carry out the butt welding of plate plate; After the cooling of weldering cutting edge of a knife or a sword, weld seam is carried out heating and rolling process, rapidly weld seam is heated to 725 DEG C, insulation 20s, extrude with roll butt welded seam, squeeze pressure is about 7 tons.Weld seam is reheated 700 DEG C after being cooled to temperature to be less than 150 DEG C by the weld seam after rolling, naturally cooling in air.
2, continuous-tube shaping with weld
Steel band edges of boards adopt milling limit method to be V-type by edge milling, accurately control strip width and edges of boards verticality; UOE row-roll forming process method is adopted to control steel belt molding; Adopt hight frequency welding technology welding continuous-tube pipe, weld fast 18m/min, frequency 380KHz, power 170Kw, amount of compression are at 1.5mm, and angular aperture θ controls at 6 °.Being welded into caliber is Φ 50.8mm, and wall thickness is the vertical masonry joint electricresistance welded steel pipe of 4.44mm.
3, weld seam thermal treatment
Postwelding strikes off the outer burr of tube wall, and by Intermediate Frequency Induction Heating Equipment, weld seam is heated to rapidly 925 DEG C, controlling water-cooled temperature is subsequently 25 DEG C, makes weld seam temperature about 450 DEG C carry out water-cooled, has obtained good Weld Performance.
4, full body thermal treatment
In order to eliminate unrelieved stress after tubulation, body mother metal produces good structure property, will medium-frequency heating system be utilized to be heated to 720 DEG C to the full body of continuous-tube, then carries out water-cooled.
5, the continuous crisping of superstrength continuous-tube
Be wound on the reel of suitable core diameter by reeling machine, continuous seepage prepares 3500m superstrength continuous-tube, so that transport and use.
6, the salient features of superstrength continuous-tube
Yield strength is 725MPa, and tensile strength is 820MPa, and unit elongation reaches 24%, and hardness is less than 28HV.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.
Claims (7)
1. a high-strength high-performance continuous-tube, is characterized in that: yield strength 689-965MPa, the tensile strength 758-1034MPa of described continuous-tube, unit elongation >=13%, external diametrical extent are Φ 25.4-Φ 88.9mm, wall thickness range is 2.4-6.35mm, length range is 1000-10000m, hardness≤28HRC.
2. continuous-tube as claimed in claim 1, it is characterized in that, according to mass percent, the chemical composition of described continuous-tube is as follows: C0.12-0.16%, Mn0.7-2.0%, P≤0.002%, S≤0.003%, Si0.4-0.45%, Cr1.0-1.5%, Ni0.36-0.8%, Cu0.26-0.4%, Mo0.45-0.5%, Al0.04-0.05%, Ti0.03-0.05%, V0.05-0.08%, Nb0.02-0.06%, Fe surplus.
3. the manufacture method of continuous-tube as claimed in claim 1 or 2, is characterized in that, in accordance with the following steps:
(1) using molten iron as main raw material, through top end compound blow converter and argon oxygen decarburization, ladle refining and external refining, and pour into continuously cast bloom; Strand is cast slab, finally makes length more than 500 meters of roll bendings;
(2) roll bending slitting and docking;
(3) vertical masonry joint superstrength continuous-tube is manufactured;
(4) need to heat-treat respectively to ratio-frequency welding weld seam and full body.
4. the manufacture method of continuous-tube as claimed in claim 3, it is characterized in that, described step (1) is: by slab heating temperature to 1050-1250 DEG C, continuous casting technology application induction stirring is adopted to control to cast the slab of 20-60mm thickness, finishing temperature: 820-880 DEG C, rolled into the hot-rolled sheet of 2.4-6.35mm thickness, coiling temperature 500-600 DEG C, finally made length more than 500 meters of roll bendings.
5. the manufacture method of continuous-tube as claimed in claim 3, it is characterized in that, described step (2) is: by the superstrength roll bending for preparing according to continuous-tube specification requirement, be cut into the steel band of 80-300mm by slitting line; For meeting continuous-tube length requirement, need by steel band spreading; Steel band spreading adopts the method for 45 ° of inclined weld docking; When docking, after at 45 ° for the end machining of two steel bands in front and back, reasonable finished edge, groove is I type, V-type or U-shaped, plasma landfilling area or argon arc welding method is adopted to be welded, when after weld seam cooling, trimming surface, then reheats more than AC3 temperature by weld dimensions, insulation 10-30s, adopt the pressure of 5-9 ton, weld dimensions is carried out high temperature rolling, weld dimensions naturally cooling after rolling; After cooling temperature is less than 150 DEG C, weld dimensions is reheated 600-800 DEG C and anneal.
6. the manufacture method of continuous-tube as claimed in claim 3, it is characterized in that, described step (2) is: according to external diameter and the wall thickness requirement of final continuous-tube, adopt the method on milling limit that I type, V-type or X-type groove are dug in band steel side, accurate control strip width and edges of boards verticality, adopt UOE row-roll forming process method to control steel belt molding; Utilize high frequency induction welding connection technology, accurately control angular aperture and amount of compression and welding setting, longitudinal measure is carried out to shaping steel band, guarantees welding quality; Control the amount of compression of weld seam at 1.0-2.5mm, angular aperture θ controls at 4-8 °, and welding speed is 15-25m/min; Being welded into caliber is Φ 25.4-Φ 88.9mm, and wall thickness is the vertical masonry joint superstrength continuous-tube of 2.4-6.35mm.
7. the manufacture method of continuous-tube as claimed in claim 3, it is characterized in that, described step (2) is: after having welded, weld seam is locally heated to more than AC3, and adopt extrusion roll to adopt the mode butt welded seam of sizing to apply certain deformation quantity to its tubing, subsequently to its quenching; After having quenched, adopted intermediate frequency or other rapid heating modes, homogeneous tube is heated to two-phase region, carries out controlled cooling model after heat penetration to it, elimination weld seam is bad eliminates tissue, reduction hardness, improves overall performance; Weld seam thermal treatment temp is: 850-960 DEG C, full body thermal treatment temp 600-850 DEG C.
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