CN102199729A - Economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe and manufacturing method thereof - Google Patents
Economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe and manufacturing method thereof Download PDFInfo
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- CN102199729A CN102199729A CN 201010130927 CN201010130927A CN102199729A CN 102199729 A CN102199729 A CN 102199729A CN 201010130927 CN201010130927 CN 201010130927 CN 201010130927 A CN201010130927 A CN 201010130927A CN 102199729 A CN102199729 A CN 102199729A
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Abstract
The invention discloses an economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe, which comprises the following chemical components in percentage by weight: 0.05-0.15% of C, 0.10-0.8% of Si, 0.40-1.2% of Mn, 2.5-4.5% of Cr, 0.01-0.1.% of Al, and the balance of Fe and unavoidable impurities, wherein the total weight of the impurity elements is lower than 0.05%. The oil well pipe is obtained by the steps of steel making, casting and hot rolling, and air cooling, the thermal treatment procedure of hardening and tempering or normalizing in the traditional oil well pipe casting technology is omitted, and the cost is saved. In addition, the economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe also has favorable CO2 corrosion resistance.
Description
Technical field
The present invention relates to a kind of oil well pipe, particularly economical 55Ksi grade of steel has anti-CO
2Corrosion oil well pipe and manufacture method thereof.
Background technology
The CO of oil well pipe
2Corrosion is a kind of common phenomena in oilfield exploitation procedure.
From materialogy and anticorrosion angle, contain CO at height
2, in the strong corrosive environment that forms of chlorion, low pH value and well mesohigh and fluid scouring, use expensive super 13Cr stainless steel pipe can guarantee the oil field long-term safety effectively, produce efficiently.But say that from economy because of China's oil field majority belongs to the lean ore low permeability oil field, and production life of well is shorter, mostly below 10 years, use expensive high Cr stainless steel oil pipe economy relatively poor, so a lot of oil field causes occurring a lot of serious CO at present also at widely-used conventional straight carbon steel oil pipe
2The corrosion accident.
Along with the change of field conditions, in the much more shallow oil gas well trace amounts of CO appears
2, and content is the gesture of continuous increase, makes the general carbon steel pipe that adopts at present CO often occur
2The corrosion failure phenomenon has had a strong impact on oil field ordinary production and economic benefit.For these shallow wells, the general 55ksi grade of steel that adopts gets final product on the tubing and casing intensity.But, up to the present, also do not exist on the market to have good resistance CO
2The simple relatively economical tubing and casing product of 55ksi grade of steel of corrosive effect and production technique.
Relevant anti-CO
2Corrosion (or anti-simultaneously CO
2And H
2The S corrosion) using steel alloy, is the interalloy or the high alloys such as super 13Cr, 15Cr and 22Cr duplex stainless steel of 80ksi and above grade of steel mostly.
As China Patent No. CN1401809A, CN1292429A, CN1487112A, European patent EP 995809A1, WO9941422, U.S. Pat 6648991, Japanese JP2001059136, JP2000063994.And Chinese patent application numbers 200910053666.2.
The low alloy steel and the tubing and casing of Chinese patent CN1401809A carbon dioxide corrosion-resistant, main by adding suitable Mo, Ni, elements such as W, Cr, after modified or normalizing treatment, obtain excellent carbon dioxide corrosion-resistant performance, the relevant tubing and casing mechanical property of being produced for the 80ksi grade of steel and more than.
Chinese patent CN1292429A resistant to carbon dioxide and sea-water corrosion low-alloy steel for oil casing pipe, adopt the Ultra-low carbon composition, usually improve the resistant to carbon dioxide and the sea-water corrosion performance of alloy by adding units such as suitable Mo, Cr, Cu, intensity can reach more than the 80ksi grade of steel after smelting, forging, rolling, thermal treatment.
Chinese patent CN1487112A resistant to carbon dioxide and hydrogen sulfide corrosion low alloy steel, its principal feature are can make the anti-CO2 of 80～95ksi grade of steel, H2S corrosion oil annular pipe by modified thermal treatment after adding 3% left and right sides Cr and RE elements of Ce.
European patent EP 995809A1, main by adding Cr and the proper C u and the Al of more content, to improve the resistant to carbon dioxide and the sea-water corrosion performance of material, especially overcome the local corrosion phenomenon under the particular medium condition.But this patent interalloy element especially add-on of Cr surpasses 4%, high alloy category in belonging to, and the cost of steel pipe is higher.In addition, this patent steel alloy through quench or normalizing treatment after obtain martensitic stucture, the intensity of gained the finished product is more than the 80ksi grade of steel after further modified or normalizing+temper.
Patent WO9941422 is a main alloy element with Mn, Cr, adds a spot of Cu, Ni, Mo, Ti, Nb, B in case of necessity, and product finally is martensite type tissue, and intensity is more than the 80ksi grade of steel.
U.S. Pat 6648991 is a main alloy element with Cr, Mn, is equipped with suitable Mo, V element, belongs to the low alloy steel scope.Normalizing or hardening and tempering process are handled after the alloy employing hot rolling of patented invention, and gained tubing and casing intensity can contain more than 55～125ksi grade of steel.
Japanese Patent JP2001059136 and JP2000063994 be the Cr by adding more content and an amount of B and by obtaining the intensity more than the 80ksi grade of steel after the modified thermal treatment mainly.
The alloy steel grade that aforementioned several patents is related is taked normalizing or modified heat treatment mode mostly in the production process, steel strength mostly is more than the 80ksi.
Chinese patent application number is 200910053666.2, and low-carbon low-alloy steel scope in belonging to is utilized the strengthening effect of Cr and Mn, is aided with the comprehensive action of Cr, Ni and Cu element simultaneously, to reach anti-CO
2The raising of corrosive nature.
Summary of the invention
When combination of acidic corrosion working conditions such as containing carbonic acid gas, chlorion existed, the normal common J55 carbon steel pipe that adopts was poor because of solidity to corrosion in the following shallow well of 2500m at present, caused the oilfield economic loss thereby be easy to inefficacy.The object of the invention is to provide a kind of economical 55Ksi grade of steel to have anti-CO
2Corrosion oil well pipe and manufacture method thereof have good anti-CO
2Corrosive nature, manufacture method are simple relatively.
For achieving the above object, technical scheme of the present invention is,
Economical 55Ksi grade of steel has anti-CO
2The corrosion oil well pipe, its chemical component weight per-cent is: C:0.05～0.15%, Si:0.10～0.8%, Mn:0.40～1.2%, Cr:2.5～4.5%, Al:0.01～0.10%, all the other are Fe and unavoidable impurities, and the total amount of impurity element is lower than 0.05%.
The present invention is air cooling after steel-making, casting, hot rolling, and its mechanical property has reached the requirement of 55ksi grade of steel.The typical corrosive environment in domestic certain oil field of simulation carries out autoclave corrosion simultaneous test, and test-results shows, under same experimental conditions, compares conventional J55 oil well pipe, and the annual erosion rate of steel of the present invention has reduced more than 3 times.
Steel alloy of the present invention selects the reason of chemical ingredients scope as follows:
C guarantees steel pipe room temperature strength and the necessary composition of hardening capacity.Under this composition system, carbon content is lower than the insufficient strength of 0.05% o'clock steel, is higher than 0.15% toughness and degenerates.
Play desoxydatoin in the Si adding steel.Be lower than 0.10% content DeGrain.After content surpassed 0.8%, processibility and toughness worsened.
The adding of Cr is to improving the intensity and the anti-CO of steel
2Corrosive nature has great role.Under this composition system, Cr content is less than 2.5% o'clock, the anti-CO of steel
2The corrosive nature increase rate is not obvious, is higher than at 4.5% o'clock, the processibility variation, and material cost improves.Cr content generally is controlled at 2.5～4.5%.
Mn is the necessary element of obdurability that improves steel, and is less less than effect in 0.4% o'clock.After Mn content surpasses 1.2%, anti-CO
2Corrodibility descends.
Al has played the effect of desoxydatoin and crystal grain thinning in steel, also improved the stability and the solidity to corrosion of superficial film in addition.When add-on is lower than 0.01%, DeGrain, add-on surpasses 0.10%, the mechanical property variation.
Comparatively speaking, tube product related to the present invention mostly is intensity 80ksi and above grade of steel at present, belongs to interalloy or high alloy categories such as super 13Cr, 15Cr and 22Cr duplex stainless steel on the chemical ingredients.
The economical 55Ksi grade of steel of the present invention has anti-CO
2The manufacture method of corrosion oil well pipe mainly comprises the steps:
1) smelts, is cast as base by mentioned component; Begin 1650 ± 5 ℃ of tapping temperatures during steel-making, casting beginning temperature is 1565～1545 ℃;
2) hot rolling begins drilling/rollings at 1180～1250 ℃ when strand carries out hot rolling, final tension reducing, 850～950 ℃ of tube reducing temperature;
3) air cooling.
In existing oil well pipe manufacturing process, often need the heat treatment mode of or normalizing modified to guarantee 80Ksi grade of steel and above intensity and carbon dioxide corrosion-resistant performance behind the hot-rolled process by high temperature, reach performance requriements promptly be higher than under 650 ℃ of temperature long-time tempering of high temperature or normalizing treatment again after being higher than temperature shrend more than 850 ℃ (or oil quenching, air quenching) after, its technological process of production is steel smelting-continuous casting-tube rolling-modified or normalizing thermal treatment.
The present invention is owing to taked new composition design, and the technological process of production is reduced to steel-making-casting-tube rolling-air cooling and gets final product, and the back does not have modified or this step of normalizing thermal treatment.The steel pipe air cooling is to room temperature after the hot rolling, need not subsequent heat treatment, saved the thermal treatment cost.
Beneficial effect of the present invention
Steel grade of the present invention is an intensity 55ksi grade of steel, belong to (surpassing) low-carbon low-alloy steel category on the chemical ingredients, and manufacturing process is simple, air cooling can obtain the processed oil well casing after steel-making, continuous casting and the hot rolling of routine, dispensed the heat treatment process of modified or normalizing, provided cost savings.The technological process of production is reduced to steel-making-casting-tube rolling and gets final product.
Its CO of 55ksi tubing and casing that adopts mentioned component and manufacture method to produce
2The conventional J55 product that year erosion rate is used than present oil field has reduced more than 3 times.
Steel alloy of the present invention makes full use of the strengthening effect of Cr, Mn element and the certain content Cr element advantageous effect to carbon dioxide corrosion-resistant, do not adding under the expensive element situations such as Mo, Ni, air cooling can obtain 55ksi steel grade oil sleeve pipe after the hot rolling, to be used for carbonated shallow well below the 2500m.Compare the J55 tubing and casing of conventional API standard, when keeping than simple production technology, the carbon dioxide corrosion-resistant performance is improved significantly.
Description of drawings
Fig. 1 a is a testing surface pattern photo after the embodiment of the invention steel autoclave corrosion test;
Fig. 1 b is a testing surface pattern photo after the common J55 steel autoclave corrosion test.
Embodiment
The present invention will be further described below in conjunction with embodiment.Embodiment of the invention composition is referring to table 1, and mechanical property, the corrosive nature of embodiment steel see Table 2.
The chemical ingredients of table 1 steel alloy of the present invention and existing steel alloy, wt%
| Embodiment | C | Si | Mn | Cr | V | Al | Heat treatment mode | Tissue |
| ?1 | 0.08 | 0.61 | 0.88 | 3.21 | ? | 0.04 | The hot rolling attitude | Ferrite+perlite+sorbite |
| ?2 | 0.05 | 0.80 | 0.82 | 3.98 | ? | 0.01 | The hot rolling attitude | Ferrite+perlite+sorbite |
| ?3 | 0.12 | 0.30 | 0.52 | 2.88 | ? | 0.06 | The hot rolling attitude | Ferrite+perlite+sorbite |
| ?4 | 0.07 | 0.53 | 0.61 | 4.50 | ? | 0.07 | The hot rolling attitude | Ferrite+perlite+sorbite |
| ?5 | 0.15 | 0.10 | 0.40 | 3.42 | ? | 0.05 | The hot rolling attitude | Ferrite+perlite+sorbite |
| ?6 | 0.09 | 0.52 | 1.20 | 2.50 | ? | 0.10 | The hot rolling attitude | Ferrite+perlite+sorbite |
| Comparative Examples 1 | 0.32 | 0.37 | 1.48 | ? | 0.04 | ? | The hot rolling attitude | Ferrite+perlite |
| Comparative Examples 2 | 0.35 | 0.45 | 1.20 | ? | ? | ? | The hot rolling attitude | Ferrite+perlite |
The chemical ingredients of Comparative Examples all is an oil field J55 steel pipe commonly used at present in the table 1.The foregoing description processing parameter is: begin about 1650 ℃ of tapping temperature during steel-making, casting---continuous casting begins about 1550 ℃ of temperature, and about 1200 ℃ of beginning drilling/rollings, temperature was about 900 ℃ behind the final tension reducing when continuously cast bloom carried out hot rolling.The steel pipe air cooling need not subsequent heat treatment to room temperature after the hot rolling.
Mechanical property, the corrosive nature of table 2 embodiment steel
Annotate: test conditions is Na
++ K
+: 19702mg/L; HCO
3-: 75.4mg/L; Cl
-: 31720.8mg/L; SO
4 2-: 99.1mg/L; Ca
2+: 1308.6mg/L; Mg
2+: 217.2mg/L; PH=6.0, test temperature: 70 ℃, CO
2Dividing potential drop: 1.5Mpa, flow velocity: 1.5m/s, time: 240h.
Steel alloy of the present invention is after air cooling after smelting, forging, the hot rolling is handled, meet 55ksi grade of steel (corresponding SMYS the is 379Mpa) performance requriements (shown in the table 2) of API 5CT standard through Mechanics Performance Testing, Mechanics Performance Testing is undertaken by the GB6397-86 standard.At CO
2Corrosion is than carrying out the corrosion simulated simultaneous test of autoclave in certain outstanding oil field typical case's corrosive environment, and test-results shows, compares the CO of alloy steel grade of the present invention with the present J55 steel pipe that uses in oil field
2Year erosion rate reduces more than 3 times, and the local corrosion phenomenon obtains obvious suppression, and the surface topography after the two test is shown in Fig. 1 a, Fig. 1 b.
Claims (2)
1. economical 55Ksi grade of steel has anti-CO
2The corrosion oil well pipe, its chemical component weight per-cent is: C:0.05～0.15%, Si:0.10～0.8%, Mn:0.40～1.2%, Cr:2.5～4.5%, Al:0.01～0.10%, all the other are Fe and unavoidable impurities, and the total amount of impurity element is lower than 0.05%.
2. economical 55Ksi grade of steel has anti-CO
2The manufacture method of corrosion oil well pipe mainly comprises the steps:
1) smelts, is cast as base by mentioned component; Begin 1650 ± 5 ℃ of tapping temperatures during steel-making, casting beginning temperature is 1565～1545 ℃;
2) hot rolling begins drilling/rollings at 1180～1250 ℃ when strand carries out hot rolling, final tension reducing, 850～950 ℃ of tube reducing temperature;
3) air cooling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010130927 CN102199729A (en) | 2010-03-23 | 2010-03-23 | Economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe and manufacturing method thereof |
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|---|---|---|---|
| CN 201010130927 CN102199729A (en) | 2010-03-23 | 2010-03-23 | Economic-type 55Ksi-steel-grade CO2-corrosion-resistant oil well pipe and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632078A (en) * | 2012-05-03 | 2012-08-15 | 无锡西姆莱斯石油专用管制造有限公司 | Production method of J55 steel-grade oil casing capable of resisting impact load |
| CN103215513A (en) * | 2013-04-25 | 2013-07-24 | 宝山钢铁股份有限公司 | Corrosion-resistant gathering and transportation line pipe and manufacturing method thereof |
| CN104451394A (en) * | 2014-11-25 | 2015-03-25 | 江苏常宝钢管股份有限公司 | Anti-CO2 corrosion oil well pipe below 150 ksi produced by CPE unit and production method thereof |
| CN105648337A (en) * | 2016-01-15 | 2016-06-08 | 宝山钢铁股份有限公司 | Low-carbon CO2-resistant normalized seamless line pipe and manufacturing method thereof |
| CN111549292A (en) * | 2020-05-29 | 2020-08-18 | 舞阳钢铁有限责任公司 | Low-cost high-alloy Cr-Mo pipe fitting steel plate and production method thereof |
| CN115369316A (en) * | 2021-05-21 | 2022-11-22 | 宝山钢铁股份有限公司 | High-strength seamless steel tube with excellent carbon dioxide corrosion resistance and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5743958A (en) * | 1980-08-30 | 1982-03-12 | Nippon Steel Corp | Steel material for line pipe with excellent carbon dioxide corrosion resistance |
| CN101487100A (en) * | 2008-01-17 | 2009-07-22 | 宝山钢铁股份有限公司 | Low-alloy steel for llOKsi steel grade sulfurated hydrogen carbon dioxide corrosion resisting oil casing tube |
-
2010
- 2010-03-23 CN CN 201010130927 patent/CN102199729A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5743958A (en) * | 1980-08-30 | 1982-03-12 | Nippon Steel Corp | Steel material for line pipe with excellent carbon dioxide corrosion resistance |
| CN101487100A (en) * | 2008-01-17 | 2009-07-22 | 宝山钢铁股份有限公司 | Low-alloy steel for llOKsi steel grade sulfurated hydrogen carbon dioxide corrosion resisting oil casing tube |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632078A (en) * | 2012-05-03 | 2012-08-15 | 无锡西姆莱斯石油专用管制造有限公司 | Production method of J55 steel-grade oil casing capable of resisting impact load |
| CN103215513A (en) * | 2013-04-25 | 2013-07-24 | 宝山钢铁股份有限公司 | Corrosion-resistant gathering and transportation line pipe and manufacturing method thereof |
| CN104451394A (en) * | 2014-11-25 | 2015-03-25 | 江苏常宝钢管股份有限公司 | Anti-CO2 corrosion oil well pipe below 150 ksi produced by CPE unit and production method thereof |
| CN104451394B (en) * | 2014-11-25 | 2017-01-25 | 江苏常宝钢管股份有限公司 | Anti-CO2 corrosion oil well pipe below 150 ksi produced by CPE unit and production method thereof |
| CN105648337A (en) * | 2016-01-15 | 2016-06-08 | 宝山钢铁股份有限公司 | Low-carbon CO2-resistant normalized seamless line pipe and manufacturing method thereof |
| CN111549292A (en) * | 2020-05-29 | 2020-08-18 | 舞阳钢铁有限责任公司 | Low-cost high-alloy Cr-Mo pipe fitting steel plate and production method thereof |
| CN115369316A (en) * | 2021-05-21 | 2022-11-22 | 宝山钢铁股份有限公司 | High-strength seamless steel tube with excellent carbon dioxide corrosion resistance and manufacturing method thereof |
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Application publication date: 20110928 |