CN102296239A - High-strength anti-collapsing petroleum casing column and manufacturing method thereof - Google Patents
High-strength anti-collapsing petroleum casing column and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength anti-collapsing petroleum casing column. The casing column comprises the following chemical elements in percentage by mass: 0.24-0.30 percent of C, 0.9-1.3 percent of Mn, 0.25-0.50 percent of Si, 0.9-1.3 percent of Cr, 0.6-0.8 percent of Mo, 0.06-0.10 percent of V, 0.01-0.03 percent of Al, 0.02-0.05 percent of Nb, 0-0.03 percent of Zr, less than 0.004 percent of B, less than 0.03 percent of Ti, less than 0.015 percent of P, less than 0.010 percent of S, 0.001-0.006 percent of Ca, and the balance of Fe and inevitable impurities, wherein Ca/S ratio is more than 1; the external diameter size Phi of the casing column is 141.3 mm to 142.7 mm; and the wall thickness of the casing column is 10.7 mm to 12.9 mm. Correspondingly, the invention further provides a manufacturing method of the casing column.
Description
Technical field
The present invention relates to a kind of petroleum casing pipe tubing string and manufacture method thereof, relate in particular to a kind of anti-petroleum casing pipe tubing string and manufacture method thereof of ruining of squeezing.
Background technology
There is special geological condition the Zhongyuan Oil Field, and most wells need be passed salt rock stratum, mud stone layer, saline bed, and terrestrial stress is up to 120MPa, therefore requires very highly for the anti-squeezing power of the petroleum casing pipe of transfer oil, need be not less than 168MPa.In addition,, have plasticity wriggling property, the sleeve pipe after wellbore construction and the completion is all had very big harm because salt deposit well section is very unstable.Generally speaking, suffered outer crowded power of petroleum casing pipe and maximum stress increase with the increase of salt layer thickness, the degree of depth.The saline bed dissolving causes well to enlarge, form solution cavity, sleeve pipe forms depression bar and supports overburden pressure, simultaneously saline bed flows, slippage, caving in makes sleeve pipe increased by non-uniform load, force-bearing situation worsens, and the suffered outer power of squeezing of sleeve pipe will surpass the maximum load-carrying capacity that sleeve pipe itself can bear, thereby causes sleeve pipe to damage distortion inevitably, studies show that it is the major cause that the Zhongyuan Oil Field sleeve pipe damages that the salt deposit wriggling damages due to crushing.
For the extrusion capability that how to improve the anti-salt deposit of Zhongyuan Oil Field sand string, open day is on January 15th, 2003, publication number is CN1391022, name is called the Chinese patent of " ultrahigh-strength sleeved petroleum pipe with special jointer for resisting squeeze and production method thereof ", a kind of superstrength anti-collapse oil casing of special syndeton is disclosed, the TP130TT heavy casing of Φ 152.4 * 16.9 specifications that this technical scheme is related can solve salt interval telescopic effectively and damage problem.Because this patent is not controlled the alloying constituent and the organizational factor of petroleum casing pipe, therefore can only satisfy the performance requriements of oil field by the means that increase external diameter and wall thickness to the super high collapse-resistance of sleeve pipe.Under the constant situation of other condition, increase the telescopic wall thickness and be really one of effective means that improves the sleeve pipe crushing strength.Yet there are the following problems in the use of heavy casing:
(1) because heavy casing only is applied to the saline bed section, need telescopic joint with the Φ 139.7mm specification of API standard up and down, therefore need to adopt to become the special pipe nipple transition of button.About this pipe nipple external diameter 178mm, and the gap between the well is less, and difficulty of construction is big;
(2), otherwise may directly cause the difficulty of going into the well because heavy casing rigidity height is necessary prudent to the selection of whipstock point;
(3) present applied exploitation well major part is an orientation well, and hole drift angle is bigger, thereby has increased the possibility that unusual casing is gone into the well and is hampered, for this reason, heavy casing when going into the well every all need the mounting sleeve centralizer.
In order to reduce the external diameter wall thickness, increase the telescopic amount of deflection, to enhance productivity, the reduction production cost is convenient to the operation of complicated geological stress condition hole conditions such as eastern Pu area saline bed, mud stone layer, and it is extremely urgent to invent the anti-crowded sleeve pipe of novel high grade of steel.
Summary of the invention
The purpose of this invention is to provide a kind of high strength anti-collapse oil casing tubing string, it not only can reach the requirement that the anti-crowded ability of ruining of petroleum casing pipe is not less than 168MPa, and reduced its cover external diameter of pipe near API standard specifications sleeve pipe, can directly be connected with pipe string up and down, carry out transition and do not make and do not need adopt to become the special pipe nipple of button, thus the running casing construction is more convenient, safer.
Generally speaking, anti-the squeezing of telescopic ruined yield strength, Young's modulus, the constitutive relation that performance depends primarily on material; Depend on telescopic unrelieved stress, sleeve pipe radius-thickness ratio, dimensional precision, for example telescopic out of roundness, casing wall thickness deviation etc.; Test pattern when depending on test, the length-to-diameter ratio of sample, loading velocity etc. are all multifactor.Yet except above-mentioned factor, the contriver also finds to design by texture design and telescopic composition and improves the anti-performance of squeezing of telescopic.Therefore, under the prerequisite that satisfies the oil field demand, the thin-walled tube that the contriver has invented near the API standard specifications substitutes existing thick-walled tube, this thin-walled tube intensity height, and yield strength is more than 150 grade of steels.
According to above-mentioned purpose of the present invention and inventive concept, the present invention proposes a kind of high strength anti-collapse oil casing tubing string, and the chemical element quality per distribution ratio of described tubing string is:
C:0.24-0.30%; Mn:0.9-1.3%; Si:0.25-0.50%; Cr:0.9-1.3%; Mo:0.6-0.8%; V:0.06-0.10%; Al:0.01-0.03%; Nb:0.02-0.05%; Zr:0-0.03%; Ti:＜0.03%; B＜0.004%; P＜0.015%; S＜0.010%; Ca:0.001-0.006%; Surplus is Fe and unavoidable impurities; And satisfy Ca/S＞1;
The outside dimension of described tubing string is φ 141.3mm～φ 142.7mm; The wall thickness of described tubing string is 10.7mm～12.9mm.
Preferably, the button shape of described tubing string is oval screw thread.
The composition principle of design of above-mentioned each chemical element is as follows:
C: among the present invention, in order to alleviate sleeve pipe tubing string shrend rimose susceptibility, the C constituent content should not be greater than 0.34%, but therefore the too low intensity that will diminish material of C constituent content control C constituent content 0.24-0.30wt%.
Mn: be dissolved in ferrite and play strengthening effect, be used for improving the hardening capacity of steel, but content when too high segregation serious, diminishes the anti-of sleeve pipe tubing string and squeeze performance, so the Mn constituent content is designed to 0.9-1.3wt%.
Si: solid solution is in the yield strength of ferrite with the raising steel, but plasticity and the toughness that will lose steel simultaneously, therefore controlling the Si constituent content is 0.25-0.5wt%.
Cr: the element that is a kind of strong raising hardening capacity, be the strong carbide forming element simultaneously, carbide precipitate can improve the intensity of steel during tempering, help delaying the conquassation unstability process of sleeve pipe tubing string, but can separate out thick M23C6 carbide during too high levels, therefore controlling the Cr constituent content is 0.9-1.3wt%.
Mo: improve the hardening capacity element, the strong carbide forming element can effectively improve the temper resistance of steel, carbide precipitate improves the intensity of steel during tempering, help delaying conquassation unstability process, separate out oarse-grained Mo2C during too high levels, therefore controlling the Mo constituent content is 0.6-0.8wt%.
The carbonitride of V:V small and dispersed in ferrite is separated out, and can further reach the effect of precipitation strength in the tempered process, and the motion of pinning dislocation effectively hinders starting of slip system, delays the process of conquassation unstability.Should adopt content 0.06-0.10wt%.
Al: forming AlN can refine austenite crystal grain, helps delaying conquassation unstability process.Should adopt content 0.01-0.03wt%.
Nb: can postpone austenite recrystallization during the hot rolling of sleeve pipe tubing string, and change recrystallize and phase transformation texture type and power when reaching crystal grain thinning, in cooling and course of hot rolling subsequently, Nb (C, N) particle dispersion is separated out, and can play the effect of precipitation strength again.In the reheat process, can hinder austenite crystal and grow up, help improving the anti-performance of squeezing.Should adopt content 0.02-0.05wt%.
Ti: strong carbonitride forming element, form TiN, TiC and in soaking and reheat process, all can stop austenite crystal to be grown up, change recrystallize and phase transformation texture type in the time of refine austenite crystal grain with strong and weak, help improving the anti-performance of squeezing; If content is too high, easily form thick TiN.By weight percentage, should adopt content 0-0.03.
B: tradition improves alloy hardening capacity element, can generate BN with N, if too high levels is separated out boride along crystal boundary, reduces the toughness and the anti-H 2 S performance of material, should adopt content 0-0.004wt%.。
Zr: strong carbonitride forming element, effective cleaning molten steel improves the toughness of material, helps improving anti-crowded performance, should adopt content 0-0.03wt%.。
Ca: can cleaning molten steel, impel the MnS nodularization, improve the anti-of material and squeeze performance, but easily form thick non-metallic inclusion during too high levels, so control Ca constituent content is 0.001-0.006wt%, ratio C a/S＞1 of while Ca, S constituent content.
Sleeve pipe tubing string of the present invention pass through appropriate design chemical element component, make that all more existing standard specifications petroleum casing pipe of its caliber and wall thickness tubing string is little, it can substitute thick-walled tube, this sleeve pipe tubing string still can use Φ 139.7mm specification box cupling simultaneously, thereby under identical well space, make the sleeve pipe outer ring space increase, help improving go into the well operating efficiency and construction quality.
Correspondingly, the present invention also provides the manufacture method of above-mentioned high strength anti-collapse oil casing tubing string, comprises the following steps:
(1) molten steel is carried out external refining and become the circle base with continuous casting after the vacuum outgas;
(2) bore a hole after will justifying the base soaking;
(3) carry out tube rolling, roll the back air cooling and carry out sawing, control sleeve pipe tubing string tissue all is a bainite structure, perhaps controls the sleeve pipe tubing string and is organized as ferrite+perlite+bainite structure;
(4) the sleeve pipe tubing string is carried out modifier treatment: quenching temperature is 880～930 ℃, and soaking time is 30～60min, shrend then, and 590～650 ℃ are carried out high tempering, and soaking time is 30～80min;
(5) the sleeve pipe tubing string is carried out hot size and hot straightening, control hot size temperature is 570～640 ℃, 500～550 ℃ of hot straightening temperature, and the out of roundness of control sleeve pipe tubing string is less than 0.4%, and the inhomogeneity of wall thickness rate is less than 12%.
The present invention makes it compared to prior art owing to adopted technique scheme, has the following advantages and positively effect:
1. reduced the external diameter of sleeve pipe tubing string, made it, so the running casing construction is safer, can realize and direct connection of managing string up and down near the conventional cannula external diameter;
2. reduce the wall thickness of sleeve pipe tubing string, made logging trace VDL more can reflect the sealing quality of the outer cement mantle of sleeve pipe truly;
3. the unit rice that has reduced the sleeve pipe tubing string is heavy, when having guaranteed the sleeve pipe quality, makes the telescopic use cost reduce at least 5%, can bring remarkable economic efficiency.
4. the yield strength of sleeve pipe tubing string of the present invention can reach 1034～1206MPa, and tensile strength can reach 1103MPa; Unit elongation can reach 11%; Full-scale zero degree impact property reaches more than the 52J; Anti-crowded performance reaches the 168MPa of standard-required.
Embodiment
Embodiment 1-5
The described high strength anti-collapse oil casing of embodiment of the invention 1-5 tubing string adopts following method to make, and the chemical element quality per distribution ratio of its middle sleeve tubing string is as shown in table 1, and the size of the sleeve pipe tubing string among each embodiment is as shown in table 2:
Each chemical element quality per distribution ratio (wt%) among table 1 embodiment 1-5 and the Comparative Examples 1-4
(" reality " expression " embodiment " in the table 1, " to " expression " Comparative Examples ")
| C | Mn | Si | P | S | Cr | Mo | V | Nb | Al | Ca | Ti | B | Zr | |
| Real 1-3 | 0.24 | 0.9 | 0.25 | 0.009 | 0.003 | 1.3 | 0.8 | 0.06 | 0.02 | 0.01 | 0.006 | 0.03 | ||
| Real 4 and to 1-2 | 0.30 | 1.30 | 0.50 | 0.010 | 0.002 | 0.9 | 0.7 | 0.08 | 0.05 | 0.03 | 0.001 | 0.004 | ||
| Real 5 and to 3 | 0.27 | 1.10 | 0.35 | 0.010 | 0.001 | 1.1 | 0.6 | 0.10 | 0.04 | 0.03 | 0.004 | 0.03 | ||
| To 4 | 0.27 | 0.39 | 0.26 | 0.007 | 0.003 | 1.1 | 0.6 | 0.04 | 0 | 0.023 | 0.005 |
The outside dimension of each sleeve pipe tubing string and wall thickness (mm) among table 2 embodiment 1-5 and the Comparative Examples 1-4
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative Examples 1 | Comparative Examples 2 | Comparative Examples 3 | Comparative Examples 4 | |
| External diameter | 141.3 | 141.7 | 142.1 | 141.5 | 141.6 | 141.7 | 141.3 | 143.5 | 141.8 |
| Wall thickness | 11.3 | 10.75 | 12.7 | 11.6 | 11.7 | 10.5 | 13 | 11.3 | 11.6 |
| Implementation result | Qualified | Qualified | Qualified | Qualified | Qualified | Wall thickness is negative overproof, and crushing strength is defective | Wall thickness is just overproof, and the crushing strength allowance is too high | External diameter is just overproof, and crushing strength is defective | Tensile property is defective, and crushing strength is defective |
(1) molten steel is carried out external refining and become the circle base with continuous casting after the vacuum outgas;
(2) bore a hole after will justifying the base soaking, soaking temperature is 1220～1260 ℃, and piercing temperature is 1200～1240 ℃;
(3) carry out tube rolling, rolling temperature is more than 1000 ℃, rolls the back air cooling and carries out sawing, and control sleeve pipe tubing string is organized as bainite structure or ferrite+perlite+bainite structure;
(4) the sleeve pipe tubing string is carried out modifier treatment: quenching temperature is 880～930 ℃, and soaking time is 30～60min, shrend then, and 590～650 ℃ are carried out high tempering, and soaking time is 30～80min;
(5) the sleeve pipe tubing string is carried out hot size and hot straightening, control hot size temperature is 570～640 ℃, 500～550 ℃ of hot straightening temperature, and the out of roundness of control sleeve pipe tubing string is less than 0.4%, and the inhomogeneity of wall thickness rate is less than 12%.
Concrete processing parameter among embodiment 1-5 and the Comparative Examples 1-4 and implementation result are referring to table 3.(" reality " expression " embodiment " of first row in the form, " to " expression " Comparative Examples ")
Table 3
| Quenching temperature (℃) | Soaking time (min) | Tempering temperature (℃) | Soaking time (min) | Hot size (℃) | Hot straightening (℃) | Yield strength (MPa) | Tensile strength (MPa) | Unrelieved stress (MPa) | Crushing strength (MPa) | |
| Real 1 | 900 | 40 | 650 | 30 | 640 | 550 | 1085 | 1210 | 120 | 179 |
| Real 2 | 880 | 60 | 630 | 40 | 610 | 520 | 1085 | 1210 | 120 | 173 |
| Real 3 | 900 | 60 | 630 | 50 | 610 | 520 | 1085 | 1210 | 120 | 188 |
| Real 4 | 890 | 60 | 620 | 60 | 600 | 510 | 1150 | 1230 | 80 | 180 |
| To 1 | 900 | 60 | 620 | 60 | 600 | 510 | 1150 | 1230 | 80 | 166 |
| To 2 | 900 | 60 | 620 | 60 | 600 | 510 | 1150 | 1230 | 80 | 196 |
| Real 5 | 930 | 30 | 590 | 80 | 570 | 500 | 1180 | 1280 | 85 | 181 |
| To 3 | 900 | 60 | 600 | 60 | 570 | 530 | 1180 | 1280 | 85 | 155 |
| To 4 | 900 | 30 | 600 | 60 | 580 | 520 | 1030 | 1180 | 110 | 165 |
By table 1-3 as can be known, when cover external diameter of pipe and wall thickness depart from the described value range of this case, the anti-performance inconsistency lattice that squeeze; When chemical ingredients departed from the described value range of this case, mechanical property was defective, and the anti-performance of squeezing is also defective.Simultaneously, can draw that high strength anti-collapse oil casing of the present invention is thin than the tubing string tube wall, caliber is little, but but can reach high strength, the anti-performance of squeezing is good, meets the requirement to anti-collapse oil casing fully, has good implementation result.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (3)
1. a high strength anti-collapse oil casing tubing string is characterized in that, its chemical element quality per distribution ratio is:
C:0.24～0.30%; Mn:0.9～1.3%; Si:0.25～0.50%; Cr:0.9～1.3%; Mo:0.6～0.8%; V:0.06～0.10%; Al:0.01～0.03%; Nb:0.02～0.05%; Zr:0～0.03%; B＜0.004%; Ti＜0.03%; P＜0.015%; S＜0.010%; Ca:0.001～0.006%; Surplus is Fe and other unavoidable impurities; And satisfy Ca/S＞1;
The outside dimension of described tubing string is φ 141.3mm～φ 142.7mm; The wall thickness of described tubing string is 10.7mm～12.9mm.
2. high strength anti-collapse oil casing tubing string as claimed in claim 2 is characterized in that: the button shape of described tubing string is oval screw thread.
3. the manufacture method of high strength anti-collapse oil casing tubing string as claimed in claim 1 or 2 is characterized in that, comprises the following steps:
(1) molten steel is carried out external refining and become the circle base with continuous casting after the vacuum outgas;
(2) bore a hole after will justifying the base soaking;
(3) carry out tube rolling, roll the back air cooling and carry out sawing, control sleeve pipe tubing string tissue all is a bainite structure, perhaps controls the sleeve pipe tubing string and is organized as ferrite+perlite+bainite structure;
(4) the sleeve pipe tubing string is carried out modifier treatment: quenching temperature is 880～930 ℃, and soaking time is 30～60min, shrend then, and 590～650 ℃ are carried out high tempering, and soaking time is 30～80min;
(5) the sleeve pipe tubing string is carried out hot size and hot straightening, control hot size temperature is 570～640 ℃, 500～550 ℃ of hot straightening temperature, and the out of roundness of control sleeve pipe tubing string is less than 0.4%, and the inhomogeneity of wall thickness rate is less than 12%.
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| CN103045944A (en) * | 2012-12-27 | 2013-04-17 | 江苏长强钢铁有限公司 | High-toughness steel for petroleum casing and manufacturing method of petroleum casing |
| CN103060686A (en) * | 2012-12-27 | 2013-04-24 | 江苏长强钢铁有限公司 | Steel and seamless steel pipes used for high-performance N80 grade non-modulated oil casing, and a manufacturing method thereof |
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| CN103938094B (en) * | 2014-04-28 | 2016-08-24 | 宝山钢铁股份有限公司 | A kind of ultrahigh-intensity high-toughness petroleum casing pipe and manufacture method thereof |
| CN108004461A (en) * | 2016-10-31 | 2018-05-08 | 宝山钢铁股份有限公司 | The tubing and casing and its manufacture method of a kind of carbon dioxide corrosion-resistant |
| CN108624810A (en) * | 2017-06-26 | 2018-10-09 | 宝山钢铁股份有限公司 | A kind of high sulfur resistive oil well pipe of low-cost high-strength and its manufacturing method |
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