CN104726872A - Novel oil sleeve carbon dioxide anti-corrosion material selection chart - Google Patents
Novel oil sleeve carbon dioxide anti-corrosion material selection chart Download PDFInfo
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- CN104726872A CN104726872A CN201510161649.6A CN201510161649A CN104726872A CN 104726872 A CN104726872 A CN 104726872A CN 201510161649 A CN201510161649 A CN 201510161649A CN 104726872 A CN104726872 A CN 104726872A
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Abstract
The invention provides a novel oil sleeve carbon dioxide anti-corrosion material selection chart and mainly aims at guiding the economical and reasonable anti-corrosion material selection for oil sleeves for oil and gas fields with reservoir stratums containing carbon dioxide. The chart comprises not only carbon steel and 13Cr stainless steel oil sleeve materials; meanwhile, low Cr steel materials of different types newly developed in recent years are demarcated in an appropriate interval; and the satisfied anti-corrosion materials can be selected conveniently and quickly according to the distribution ranges of the temperatures of the oil and gas wells and the carbon dioxide partial pressures. The shortage of only available oil sleeve material selection between the carbon steel and the stainless steel is made up. The chart is obtained on the basis of lots of indoor experimental data and field collected data; the use waste or short service life of the sleeves can be effectively avoided due to over-high or over-low anti-corrosion level design; the safe production of the oil and gas fields can be ensured; and the oil sleeve cost can be reduced.
Description
Technical field
The invention relates to the achievement in research of petrochemical industry metallic material corrosion protection, particularly relate to the anticorrosion selection plate of a kind of new oil sleeve pipe carbonic acid gas.
Background technology
Some research institutions in the past and Iron And Steel Company are proposed tubing and casing selection method and plate under some corrosion working conditions, such as, the tubing and casing selection thinking at material development center, oil company of Italy is: the feasibility first considering carbon steel material, if carbon steel material does not meet the demands, then consider the stainless steel (CRA) of economical rationality, as stainless steel does not still meet the demands, then consider more senior nickel-base alloy; Only have carbon steel, stainless steel and nickel-base alloy in the anticorrosion selection plate of tubing and casing of SUMITOMO CHEMICAL company, do not relate to the low Cr steel developed in recent years.
The higher meeting of tubing and casing anticorrosion selection rank causes larger waste of material, the stainless price of 13Cr is 1.5-2.0 times of low Cr steel or plain carbon stool person, the price of 22-25Cr austenitic stainless steel or nickel-base alloy costly, if adopt expensive stainless steel greatly can improve the cost of tubing and casing in middle low corrosion environment.
In recent years, Chinese scholars expanded some researchs to low Cr steel oil bushing steel, achieved some understanding, but, do not form more complete performable theory appraisement system, do not include low Cr material in tubing and casing selection plate.Research shows: add 0.5-5%Cr element in alloy and can improve material carbon dioxide corrosion resistant performance 1.5-2 doubly, its price is only the 1/3-1/2 of 13Cr Martensite Stainless Steel, the thread gluing problem adopting 13Cr stainless steel tubing and casing to bring can be avoided simultaneously, therefore, low Cr steel tubing and casing has larger potentiality to be exploited.
Along with the continuous research and development of accumulation and the fresh oil shell material increasingly of Oil/gas Well corrosion research achievement, existing tubing and casing selection plate is difficult to satisfy the demand, urgently develop a set of economical rationality, material comprehensive tubing and casing selection plate carrys out Instructing manufacture practice, for economical rationality selects tubing and casing material to provide theoretical foundation.
Summary of the invention
The object of the invention is to the anticorrosion material of tubing and casing that guiding reservoir carbonated oil-gas field selects economical rationality.Carbon steel and stainless steel tubing and casing material is not only comprised in plate, dissimilar low Cr steel material newly developed is in recent years demarcated in suitable interval simultaneously, according to the temperature of Oil/gas Well and partial pressure of carbon dioxide value, the anticorrosion material that can satisfy condition can be selected fast and easily.Compensate for the deficiency that tubing and casing selection method in the past only carries out selecting between carbon steel and stainless steel.This plate draws on the basis of a large amount of laboratory experiment data and on-site collection data, can effectively avoid anticorrosion level design too high or too low, causes sleeve pipe use waste or do not reach work-ing life, improves oil-gas field whole development benefit.
The object of the present invention is achieved like this, the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment, described corrosion working conditions is temperature range and the partial pressure of carbon dioxide scope of tubing and casing reality, according to temperature and the dividing potential drop of practical situation determination tubing and casing, demarcated on the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment, selected the anticorrosion material of most economical rational tubing and casing according to the position that calibration point makes a decision.If temperature and dividing potential drop coordinate point drop on this environment of carbon steel region representation, lower five kinds of materials all can meet the demands, and the cost of carbon steel is minimum; If temperature and dividing potential drop coordinate point drop on this environment of 1Cr region representation beyond the range of application of carbon steel, can only select in other four kinds of materials, wherein 1Cr material cost is minimum; If temperature and dividing potential drop coordinate point drop on this environment of 3Cr region representation beyond the range of application of carbon steel and 1Cr material, only have 3Cr, 9Cr and 13Cr or more senior material can meet corrosive environment requirement, and most economical material is 3Cr material; If corrosive environment coordinate drops on the selection of 9Cr and 13Cr region, meaning is the same; Exceed the scope of application of the present invention when the temperature of corrosive environment and dividing potential drop coordinate point drop on the region beyond 13Cr, suitable material need have been determined according to concrete test experiments.
In brief, which region the temperature of actual corrosive environment and dividing potential drop drop on and just select which kind of material, and selection result is reasonably most economical.
From the above mentioned, tubing and casing selection of the present invention can select tubing and casing between carbon steel, 1Cr, 3Cr, 9Cr and 13Cr five kinds of materials, avoid the deficiency that tubing and casing selection method in the past only carries out selecting between carbon steel and stainless steel, also anticorrosion level design is effectively controlled too high or too low, cause sleeve pipe to use waste or do not reach the appearance of situation in work-ing life, under ensureing the prerequisite of oil-gas field safety in production, reduce tubing and casing cost.
Accompanying drawing explanation
Fig. 1: be the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment of the present invention.
Embodiment
In order to there be explanation clearly to embodiments of the present invention, now contrast accompanying drawing 1 and application example illustrate the specific embodiment of the present invention.
As shown in Figure 1, the anticorrosion selection plate of tubing and casing of the present invention is made up of 5 regions, be respectively carbon steel region, 1Cr region, 3Cr region, 9Cr region and 13Cr region, there is the highest applicable condition in each region, and namely the coboundary in region is the highest applicable envrionment conditions of this kind of material.Each region is to control border with major control point, the upper border line that carbon steel material can apply corrosive environment is determined by four frontier points: 1 point (30 DEG C, 0.4MPa), 2 points (90 DEG C, 0.03MPa), 3 points (70 DEG C, 0.05MPa) and 4 points (170 DEG C, 0.03MPa).Between 4, nearly straight line connects; The upper border line that 1Cr material can apply corrosive environment is determined by four frontier points: 5 points (30 DEG C, 1.0MPa), 6 points (70 DEG C, 0.3MPa), 7 points (130 DEG C, 0.1MPa) and 8 points (170 DEG C, 0.1MPa), between 4, nearly straight line connects; The upper border line that 3Cr material can apply corrosive environment is determined by four frontier points: 9 points (30 DEG C, 2.0MPa), 10 points (90 DEG C, 0.5MPa), 11 points (150 DEG C, 0.25MPa) He 12 points (170 DEG C, 0.25MPa), between 4, nearly straight line connects; The upper border line that 9Cr material can apply corrosive environment is determined by three frontier points: 13 points (50 DEG C, 10.0MPa), 14 points (120 DEG C, 0.7MPa) and 15 points (170 DEG C, 0.6MPa), and between 3, nearly straight line connects; The upper border line that 13Cr material can apply corrosive environment is determined by three frontier points: 16 points (60 DEG C, 10.0MPa), 17 points (110 DEG C, 2.0MPa) and 18 points (170 DEG C, 1.0MPa), and between 3, nearly straight line connects.
Now be described as follows for the tubing and casing selection in 13-2 oil field, Lufeng, the South Sea:
The pump inlet temperature in 13-2 oil field, Lufeng is 100 DEG C, wellhead temperature 65 degrees Celsius, and not degassed in oil gas lifting process, partial pressure of carbon dioxide remains on 0.23MPa substantially.Flow rate of liquid is less than 2.0m/s, chloride ion content 19000ppm.According to temperature range and partial pressure of carbon dioxide value, can the envrionment conditions of oil pipe be marked on plate, see Fig. 1 middle conductor AB, be distributed in 1Cr and 3Cr region, corrosive environment is described beyond the upper limit in carbon steel region, can not adopts plain carbon stool material, corrosive environment part has dropped on 1Cr region, this temperature section can select 1Cr material, and oil pipe hypomere needs to select 3Cr material just can reach requirement for anticorrosion.If oil pipe entirety adopts material of the same race, 3Cr material must be selected, could requirement for anticorrosion be met.With regard to oil pipe cost consideration, 1Cr and 3Cr mixed materials is selected to be most economical according to temperature trip point, but consider the convenient and swift of the consistence that tubing is purchased and site operation in reality, often wish the anticorrosion material using material of the same race, therefore, with regard to overall efficiency, the oil pipe selecting 3Cr material is also feasible.9Cr or 13Cr material without the need to selecting price higher under this environment.
the present invention has following beneficial effect:
(1) anticorrosion selection plate is reliable.Anticorrosion selection plate is on a large amount of simulating lab tests and hanging film scene experimental basis, and the logical funtcional relationship setting up short term corrosion speed and long-term corrosion rates, finally complete plate and draw, and have passed through the checking in part oil field, the South Sea, reliable results;
(2) good economy performance.Price is contained lower in plate in the present invention, still have the low Cr steel tubing and casing of better carbon dioxide corrosion resistant characteristic, avoid and can only select 13Cr or more senior stainless steel in the past under this envrionment conditions, reduce tubing and casing cost, improve the development benefit in oil field.
(3) convenient and swift.Plate of the present invention is utilized to carry out tubing and casing selection, very convenient, as long as determine that Oil/gas Well be carbon dioxide corrosion is main, knows the gentle partial pressure of carbon dioxide scope residing for tubing and casing, can quickly and easily according to plate selection;
In a word, the present invention can provide reliable instruction for the selection of oil-gas field tubing and casing, selection result good economy performance, and plate is convenient to use, substantially reduces the time of Oil and gas field design, while increasing economic efficiency, also has larger social benefit.
The above is the specific embodiment of the invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (6)
1. the anticorrosion selection plate of new oil sleeve pipe carbonic acid gas, described plate, for instructing the anticorrosion selection of tubing and casing, is characterized in that: this plate transverse axis represents temperature, and unit is DEG C, temperature range 30-170 DEG C, and conventional coordinate, the longitudinal axis is CO
2dividing potential drop, unit is MPa, partial pressure range 0.01-10MPa, logarithmic coordinates; Plate accurate calibration 5 regions, respectively corresponding carbon steel, 1Cr, 3Cr, 9Cr and 13Cr five kinds of tubing and casing materials; During tubing and casing selection, first calculate temperature and the CO of selection well section
2the scope of dividing potential drop, then by plotted point line, according to the distributed areas of line segment and the anticorrosion material of tubing and casing of concrete performance determination economical rationality.
2. the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment as claimed in claim 1, it is characterized in that: the upper border line that described carbon steel material can apply corrosive environment is determined primarily of four frontier points: 1 point (30 DEG C, 0.4MPa), 2 points (90 DEG C, 0.03MPa), 3 points (70 DEG C, 0.05MPa) and 4 points (170 DEG C, 0.03MPa).Between 4, nearly straight line connects.
3. the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment as claimed in claim 1, it is characterized in that: the upper border line that described 1Cr material can apply corrosive environment is determined primarily of four frontier points: 5 points (30 DEG C, 1.0MPa), 6 points (70 DEG C, 0.3MPa), 7 points (130 DEG C, 0.1MPa) and 8 points (170 DEG C, 0.1MPa), between 4, nearly straight line connects.
4. the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment as claimed in claim 1, it is characterized in that: the upper border line that described 3Cr material can apply corrosive environment is determined primarily of four frontier points: 9 points (30 DEG C, 2.0MPa), 10 points (90 DEG C, 0.5MPa), 11 points (150 DEG C, 0.25MPa) and 12 points (170 DEG C, 0.25MPa), between 4, nearly straight line connects.
5. the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment as claimed in claim 1, it is characterized in that: the upper border line that described 9Cr material can apply corrosive environment is determined primarily of three frontier points: 13 points (50 DEG C, 10.0MPa), 14 points (120 DEG C, 0.7MPa) He 15 points (170 DEG C, 0.6MPa), between 3, nearly straight line connects.
6. the anticorrosion selection plate of tubing and casing under carbon dioxide corrosion environment as claimed in claim 1, it is characterized in that: the upper border line that described 13Cr material can apply corrosive environment is determined primarily of three frontier points: 16 points (60 DEG C, 10.0MPa) .17 point (110 DEG C, 2.0MPa) He 18 points (170 DEG C, 1.0MPa), between 3, nearly straight line connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510161649.6A CN104726872A (en) | 2015-04-08 | 2015-04-08 | Novel oil sleeve carbon dioxide anti-corrosion material selection chart |
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| CN201510161649.6A CN104726872A (en) | 2015-04-08 | 2015-04-08 | Novel oil sleeve carbon dioxide anti-corrosion material selection chart |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179275A (en) * | 2017-07-01 | 2017-09-19 | 西南石油大学 | A kind of gas injection well selection boundary determines method |
| CN111177947A (en) * | 2020-01-12 | 2020-05-19 | 西南石油大学 | Multi-factor considered CO2Corrosion prediction plate establishing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101407019A (en) * | 2008-11-25 | 2009-04-15 | 西安摩尔石油工程实验室 | Process for manufacturing corrosion resistant low-chromium tubing and casing in CO2 and H2S coexisted environment |
-
2015
- 2015-04-08 CN CN201510161649.6A patent/CN104726872A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101407019A (en) * | 2008-11-25 | 2009-04-15 | 西安摩尔石油工程实验室 | Process for manufacturing corrosion resistant low-chromium tubing and casing in CO2 and H2S coexisted environment |
Non-Patent Citations (2)
| Title |
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| 微斌等: "镍基合金Inconel718与抗硫油套管钢在模拟气田地层水中的电偶腐蚀", 《腐蚀科学与防护技术》, vol. 91, no. 5, 30 September 2007 (2007-09-30), pages 319 - 322 * |
| 高惠临、王宇: "《石油工程材料》", 31 December 2011, article "油管材料", pages: 59-61 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179275A (en) * | 2017-07-01 | 2017-09-19 | 西南石油大学 | A kind of gas injection well selection boundary determines method |
| CN107179275B (en) * | 2017-07-01 | 2019-05-17 | 西南石油大学 | A kind of gas injection well selection boundary determines method |
| CN111177947A (en) * | 2020-01-12 | 2020-05-19 | 西南石油大学 | Multi-factor considered CO2Corrosion prediction plate establishing method |
| CN111177947B (en) * | 2020-01-12 | 2022-02-22 | 西南石油大学 | Multi-factor considered CO2Corrosion prediction plate establishing method |
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