CN1185368C - Water soluble corrosion inhibitor for inhibiting carbon steel CO2 corrosion and its preparation method - Google Patents
Water soluble corrosion inhibitor for inhibiting carbon steel CO2 corrosion and its preparation method Download PDFInfo
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- CN1185368C CN1185368C CNB021392048A CN02139204A CN1185368C CN 1185368 C CN1185368 C CN 1185368C CN B021392048 A CNB021392048 A CN B021392048A CN 02139204 A CN02139204 A CN 02139204A CN 1185368 C CN1185368 C CN 1185368C
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- corrosion
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- inhibiter
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Abstract
The present invention relates to a water solubility corrosion inhibitor for suppressing the CO2 corrosion of carbon steel, and a preparation method thereof. The corrosion inhibitor comprises the components by the following weight percentage of 10 to 40% of rosin amine, 5 to 30% of element acid, 5 to 30% of thiourea and thiourea derivatives, and 10 to 50% of solvent. By a molecular design method, the corrosion inhibitor is prepared from macromolecular compounds, small molecule compounds, and negative ions with specific adsorption; within wider temperature ranges, the corrosion inhibitor can better suppress the CO2 corrosion of carbon steel materials of pipelines in the oil fields with CO2; no matter whether the pipeline material surface is clean or is covered with corrosion product films, the corrosion inhibitor has strong corrosion inhibition functions, and can effectively protect oil sleeve pipes and transportation pipelines; compared with other corrosion inhibitor products, the corrosion inhibitor of the present invention is more suitable for actual conditions of oil fields with CO2. The corrosion inhibitor of the present invention has the characteristics of wide application range, little dosage, high efficiency, convenient and simple production, no poisonous drug, no foreign taste, complete water dissolution, etc.
Description
Technical field
The invention belongs to the aseptic technic of metallic substance, be specifically related to a kind of inhibition carbon steel CO
2Corrosive water soluble rust inhibitor and preparation method thereof, it is specially adapted to the CO in oil field
2The corrosive inhibition.
Background technology
CO
2Corrosion is one of corrosion form of exploitation of oil-gas field and gathering line experience.The CO that does
2Gas be do not have corrosive, but CO
2Ratio is also strong with the corrodibility of the hydrochloric acid soln of pH after being dissolved in the aqueous solution.Apply CO along with the increase of ultra deep well exploitation and oil gas well mining later stage water content and three notes oil recovery techniques
2Etching problem is on the rise.Oil fields such as a lot of oil fields of China such as Tarim Basin, long celebrating, Sichuan, North China have all faced serious CO
2Etching problem, CO
2The tubing and casing perforation that corrosion causes and the malicious event of gathering line often have report.
The filling inhibiter is the inhibition CO that the oil-gas field system usually adopts
2One of main safeguard procedures of corrosive, have easy to operate, cost is not high and characteristics such as safe and effective.The present employed inhibition CO in China oil field
2The corrosive inhibiter is main component mostly with the tetrahydroglyoxaline, and composite other organism and solvent are formed.As 17 alkenyl imidazolines (CN1052151A), this inhibiter is mainly used in gathering line and sewage works, but its usage quantity is big, and efficient is low, the cost height.The ID-1 inhibiter (CN1043534A) that the composite ethyl phosphorothioic acid ester of tetrahydroglyoxaline makes, but this inhibiter can only use under the lower situation of temperature, and the product smell is bigger.The inhibition CO that tetrahydroglyoxaline is mutually composite with alkynol
2Corrosive effect is better, can be used under the comparatively high temps, and as CN1277240A and CN1277241A, the cost of alkynol compound is higher, and very high toxicity is arranged simultaneously, and operator are had very big hazardness.
At CO
2In the corrosive environment, especially under high-temperature condition, pipeline carbon steel material surface is usually followed to generate corrosion product iron protocarbonate film, this corrosion products film is very big to the corrosion inhibition influence of filling inhibiter, and former inhibiter is not all considered this point, is the steel sample that scene or breadboard inhibiter benchmark test all use surface cleaning usually.In fact the corrosion products film that material surface generated is very big to the corrosion inhibition influence of imidazoline inhibitor, and at the metal material surface that is coated with the iron protocarbonate film, the corrosion inhibition rate of imidazoline inhibitor descends greatly, even complete failure.This also is why the imidazolines inhibiter has been used but the CO in oil field in the oil field
2The major cause that etching problem never solves.
Summary of the invention
The object of the present invention is to provide a kind of inhibition carbon steel CO
2The corrosive water soluble rust inhibitor, this inhibiter can contain CO
2Suppress the corrosion of metallic surface in the environment preferably.Inhibiter of the present invention can be used for containing CO under comparatively high temps and the elevated pressures
2Oil well or the gathering line system in, metal material surface clean or that be coated with corrosion product is all had stronger protection, have Applicable temperature wide (20 ℃-120 ℃), characteristics such as consumption is few, efficient is high, simple for production, with low cost, nontoxic free from extraneous odour; The present invention also provides the preparation method of this water soluble rust inhibitor.
For achieving the above object, a kind of inhibition carbon steel CO
2The corrosive water soluble rust inhibitor, its component comprises:
(A) 10-40% (weight) rosin Amine D
(B) 5-30% (weight) unit acid
(C) 5-30% (weight) thiocarbamide or thiourea derivative
(D) 10-50% (weight) solvent
Wherein: unit acid is formed by a kind of in acetic acid, vinylformic acid or the Mono Chloro Acetic Acid or two kinds, and solvent is formed by a kind of in water, ethanol, ethylene glycol or the Virahol or two kinds, and the general structure of thiourea derivative is: NH
2CSNH-R, wherein, R is H, NH
2Or CH
3
Above-mentioned each component can be made above-mentioned water soluble rust inhibitor by the proportioning mixing and stirring.
Inhibiter provided by the invention belongs to water-soluble, utilizes molecular design method to adopt macromolecular cpd mutually composite with the negatively charged ion of micromolecular compound and specific adsorption, no matter at material surface clean or that be coated with corrosion products film stronger corrosion inhibition is arranged all.This corrosion inhibitor product is at 20 ℃-120 ℃, high pressure CO
2In the profit environment of environment, need only can effectively control CO by 50-100mg/L
2To the corrosion of oil well tubing and casing and gathering line, corrosion inhibition rate is more than 80%.
Embodiment
The present invention has provided following experimental example, and still, these embodiment are used for limiting the scope of the invention by any way.
Embodiment 1
With weight ratio is that the ethylene glycol of 35% rosin Amine D, 10% vinylformic acid, 5% thiosemicarbazide and 50% mixes mutually, stirs, and makes complete water miscible inhibition CO
2Corrosion inhibitor.
In order to check this inhibiter to suppress CO
2The corrosive corrosion mitigating effect, the present invention has adopted high temperature static and the dynamic two kinds of method simulated field environment of high temperature that its corrosion mitigating effect is estimated.Testing used medium total mineralization is 3.42 * 10
5Mg/L oil field oil-reservoir water, material are oil field J55 steel commonly used.
Table 1 has provided this inhibiter under the different concns at 90 ℃, CO
2Dividing potential drop is the evaluation result in the 2.0MPa medium solution, and test period is 72 hours.
The inhibition efficiency of inhibiter under table 1 different concns
| Density of corrosion inhibitor (mg/L) | Erosion rate (mm/a) | Corrosion inhibition rate (%) |
| 0 | 2.37 | / |
| 50 | 0.39 | 83.7 |
| 70 | 0.20 | 91.4 |
| 100 | 0.11 | 95.4 |
Table 2 be under the differing temps this inhibiter at CO
2Dividing potential drop is 2.0MPa, and flow velocity is the dynamic evaluation result in the medium solution of 0.5m/s.Test period is 72 hours, and density of corrosion inhibitor is 100mg/L.
Inhibiter inhibition efficiency test-results under table 2 differing temps
| Temperature (℃) | Erosion rate (mm/a) | Corrosion inhibition rate (%) | |
| Blank | Inhibiter | ||
| 25 | 2.56 | 0.17 | 93.3 |
| 90 | 4.87 | 0.42 | 91.4 |
| 110 | 2.91 | 0.29 | 90.2 |
Table 3 be this inhibiter material in advance at 90 ℃, CO
2Dividing potential drop is 2.0MPa, and flow velocity is pre-etching 48 hours in the medium solution of 0.5m/s, and material surface adds the inhibiter test-results after being coated with corrosion products film again in system.Density of corrosion inhibitor is 100mg/L.
Table 3 pre-etching is inhibiter inhibition efficiency test-results after 48 hours
| Temperature (℃) | Average corrosion rate (48-72Hr) | Corrosion inhibition rate (%) | |
| Blank | Inhibiter 100mg/l | ||
| 90 | 1.34 | 0.17 | 91.3 |
Embodiment 2
With weight ratio is that the ethanol of 15% rosin Amine D, 20% acetic acid, 30% thiocarbamide and 35% mixes mutually, stirs, and makes complete water miscible inhibition pipe line steel CO
2Corrosion inhibitor.
Adopt the experimental technique simulated field environment identical that its corrosion mitigating effect is estimated with enforcement 1.Testing used medium is the 3%NaCl aqueous solution, and material is the N80 pipe line steel that the oil field is used.
Table 3 be under the differing temps this inhibiter at CO
2Dividing potential drop is 2.0MPa, and flow velocity is the dynamic evaluation result in the medium solution of 0.5m/s.Test period is 72 hours, and density of corrosion inhibitor is 100mg/L.
Inhibiter is to N80 steel inhibition efficiency test-results under table 4 differing temps
| Temperature (℃) | Erosion rate (mm/a) | Corrosion inhibition rate (%) | |||
| Blank | Inhibiter (50mg/L) | Inhibiter (100mg/L) | Inhibiter (50mg/L) | Inhibiter (100mg/L) | |
| 25 | 2.85 | 0.45 | 0.17 | 84.2 | 94.5 |
| 90 | 5.34 | 0.96 | 0.40 | 82.1 | 92.6 |
| 110 | 3.24 | 0.60 | 0.31 | 81.4 | 90.4 |
Table 5 be this pipe line steel material in advance at 90 ℃, CO
2Dividing potential drop is 2.0MPa, and flow velocity is pre-etching 48 hours in the medium solution of 0.5m/s, and material surface adds the inhibiter test-results after being coated with corrosion products film again in system.Density of corrosion inhibitor is 100mg/L.
Table 3 pre-etching is inhibiter inhibition efficiency test-results after 48 hours
| Temperature (℃) | Average corrosion rate (48-72Hr) | Corrosion inhibition rate (%) | |
| Blank | Inhibiter (100mg/l) | ||
| 90 | 1.84 | 0.14 | 92.4 |
In a word, corrosion inhibitor product of the present invention is a kind of complete water miscible chemical, this inhibiter is applied widely, can act on clean material surface, also can act on and be coated with corrosion product iron protocarbonate mould material surface, so inhibiter of the present invention is applicable to more that than other corrosion inhibitor product the oil field contains CO
2The oil well actual condition.Inhibiter of the present invention also has the characteristics such as simple, nontoxic free from extraneous odour, consumption are few of producing.To containing CO
2Oil well or gathering line in inject inhibiter of the present invention, can inhibited oil greatly sleeve pipe and the corrosion of gathering line, reduce production costs.
Claims (4)
1. one kind is suppressed carbon steel CO
2The corrosive water soluble rust inhibitor, this inhibiter comprises:
(A) 10-40% (weight) rosin Amine D
(B) 5-30% (weight) unit acid
(C) 5-30% (weight) thiocarbamide or thiourea derivative
(D) 10-50% (weight) solvent
Wherein:
Unit acid is formed by a kind of in acetic acid, vinylformic acid or the Mono Chloro Acetic Acid or two kinds, and solvent is formed by a kind of in water, ethanol, ethylene glycol or the Virahol or two kinds, and the general structure of thiourea derivative is: NH
2CSNH-R, wherein, R is H, NH
2Or CH
3
2. inhibiter according to claim 1, the acid of wherein said unit is acetic acid or vinylformic acid.
3. inhibiter according to claim 1, wherein said solvent are water or ethanol.
4. a method for preparing the described inhibiter of claim 1 is mixed each component by following proportioning, stirs:
(A) 10-40% (weight) rosin Amine D
(B) 5-30% (weight) unit acid
(C) 5-30% (weight) thiocarbamide or thiourea derivative
(D) 10-50% (weight) solvent
Wherein: unit acid is formed by a kind of in acetic acid, vinylformic acid or the Mono Chloro Acetic Acid or two kinds, and solvent is formed by a kind of in water, ethanol, ethylene glycol or the Virahol or two kinds, and the general structure of thiourea derivative is: NH
2CSNH-R, wherein, R is H, NH
2Or CH
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021392048A CN1185368C (en) | 2002-10-24 | 2002-10-24 | Water soluble corrosion inhibitor for inhibiting carbon steel CO2 corrosion and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021392048A CN1185368C (en) | 2002-10-24 | 2002-10-24 | Water soluble corrosion inhibitor for inhibiting carbon steel CO2 corrosion and its preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1410595A CN1410595A (en) | 2003-04-16 |
| CN1185368C true CN1185368C (en) | 2005-01-19 |
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ID=4749954
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021392048A Expired - Fee Related CN1185368C (en) | 2002-10-24 | 2002-10-24 | Water soluble corrosion inhibitor for inhibiting carbon steel CO2 corrosion and its preparation method |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424228C (en) * | 2006-01-14 | 2008-10-08 | 中国海洋大学 | Scale and corrosion inhibitor for inhibiting corrosion of carbon steel |
| CN100591803C (en) * | 2006-09-04 | 2010-02-24 | 中国石油集团川庆钻探工程有限公司 | Corrosion inhibitor resistant to H2S and CO2 |
| CN101063207B (en) * | 2007-01-11 | 2010-09-22 | 南京信息工程大学 | Composite corrosion inhibitor used for aminoacid acid gases absorbing agent |
| CN102071427B (en) * | 2010-12-14 | 2012-10-10 | 华中科技大学 | Corrosion inhibitor for inhibiting corrosion of high-temperature high-pressure carbon dioxide and preparation method thereof |
| CN103820789B (en) * | 2014-02-24 | 2016-02-17 | 北京化工大学 | Compositional type carbon dioxide corrosion inhibitor |
| CN104404525A (en) * | 2014-11-14 | 2015-03-11 | 中国海洋石油总公司 | Method and special-purpose preparation for preventing oil gas pipeline and equipment from being corroded |
| CN107620070B (en) * | 2017-09-08 | 2018-06-29 | 武汉楚博士科技有限公司 | Carbon dioxide corrosion inhibitor based on expired Medicines and preparation method and application |
| CN109554713B (en) * | 2018-11-12 | 2020-11-24 | 华中科技大学 | Aluminum or aluminum alloy solid corrosion inhibitor in acidic salt solution and preparation method and application thereof |
| CN114645278A (en) * | 2022-04-14 | 2022-06-21 | 天津新翔油气技术有限公司 | Carbon dioxide corrosion inhibitor and preparation method thereof |
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2002
- 2002-10-24 CN CNB021392048A patent/CN1185368C/en not_active Expired - Fee Related
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| CN1410595A (en) | 2003-04-16 |
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