CN109837546B - Ammonium persulfate corrosion inhibitor used in production oil pipeline of offshore oil field and application thereof - Google Patents
Ammonium persulfate corrosion inhibitor used in production oil pipeline of offshore oil field and application thereof Download PDFInfo
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- CN109837546B CN109837546B CN201711191948.XA CN201711191948A CN109837546B CN 109837546 B CN109837546 B CN 109837546B CN 201711191948 A CN201711191948 A CN 201711191948A CN 109837546 B CN109837546 B CN 109837546B
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Abstract
The invention relates to an ammonium persulfate corrosion inhibitor used in an oil production pipeline of an offshore oilfield and application thereof, wherein the ammonium persulfate corrosion inhibitor is prepared by compounding an inorganic passivator, organic carboxylic acid, a metal ion inhibitor and water according to a certain proportion, and the corrosion inhibitor has an excellent corrosion inhibition effect when 0.3-2% of the addition amount is in 3-5% of ammonium persulfate solution at the temperature of 60 ℃.
Description
Technical Field
The invention belongs to the technical field of petroleum additives, and particularly relates to an ammonium persulfate corrosion inhibitor used in an oil production pipeline of an offshore oilfield and application thereof.
Background
The submarine oil production device adopts a method of drilling a submarine wellhead to install the wellhead on the seabed, and produced oil gas is directly sent to land or input to a submarine oil gas collecting facility by a pipeline. In the process of oil field exploitation, due to the heterogeneity of stratum, the problem of water immersion often occurs, water shutoff is needed, and the essence is to change the seepage state of water in the stratum so as to achieve the purposes of reducing oil field water production, maintaining stratum energy and improving oil field final recovery ratio. The water shutoff agent is most commonly various high molecular weight polyacrylamide flocculant substances, and the organic high molecular substances and complex components in petroleum easily form micelle substances under the condition of 60 ℃ at the seabed, and if the organic high molecular substances are not treated for a long time, the organic high molecular substances affect the subsequent petroleum exploitation on the one hand, and the water quality pollution is caused on the other hand.
The most effective and currently not noticeable odor-producing treatment for this micellar mass is a 3% aqueous ammonium persulfate solution. The method utilizes the strong oxidizing property of ammonium persulfate to oxidize organic macromolecular substances in micelles so as to degrade the organic macromolecular substances. However, most of the storage and transportation equipment for the offshore ammonium sulfate solution contains metal materials, at most, N80 carbon steel, and once the ammonium persulfate contacts the carbon steel, Fe in the ammonium persulfate is oxidized into Fe within minutes even at normal temperature3+，Fe3+And Fe corrosion is continuously accelerated, the carbon steel surface is pitted within half an hour, the aqueous solution turns into reddish yellow, and therefore, an effective corrosion inhibitor must be added into the ammonium persulfate solution to relieve the corrosion of the ammonium persulfate solution to the carbon steel. Consult dataNo report related to the ammonium persulfate corrosion inhibitor is found.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an ammonium persulfate corrosion inhibitor used in an offshore oilfield production oil pipeline and application thereof.
The invention adopts the following technical scheme: the ammonium persulfate corrosion inhibitor used in the production oil pipeline of the offshore oil field comprises, by mass, 3-15% of an inorganic passivator, 1-3% of an organic carboxylic acid, 1-10% of a metal ion inhibitor and the balance of water.
Further, the inorganic passivator is a composition of molybdate and borax or sodium silicate, wherein molybdate is indispensable, and sodium molybdate is preferred. The mass ratio of borax or sodium silicate to sodium molybdate is more than 2: 1. The molybdate is found to have stronger corrosion inhibition on carbon steel under the condition of the existence of borate or silicate.
The organic carboxylic acid is one, two or three of tartaric acid, gluconic acid and citric acid. The purpose of adding the organic acid is to ensure a weakly acidic environment after the final addition to the ammonium persulfate solution, since ammonium persulfate is easily hydrolyzed in an alkaline solution to weaken its oxidizing property. The organic carboxylic acid is selected mainly by considering that substances such as phosphorus, ammonia nitrogen and the like which are contradictory to the requirement of green development of the technology are not introduced into the formula, and the tartaric acid, the gluconic acid and the citric acid are selected mainly because the tartaric acid, the gluconic acid and the citric acid have good solubility, convenient preparation and certain corrosion inhibition, so that the tartaric acid, the gluconic acid and the citric acid are used as auxiliary components of the corrosion inhibitor and have positive synergistic effect on the corrosion inhibition of the corrosion inhibitor.
The metal ion inhibitor is neutral or acidic substance, preferably one or more of phytic acid, ethylenediamine tetramethylene phosphonic acid and salts thereof. The phytic acid is widely present in plant seeds, belongs to natural nutriments, and is most obviously characterized in that the phytic acid has strong complexation with metal ions to play a role in inhibiting free metal ions; the ethylene diamine tetramethylene phosphonic acid and the salt water solution thereof can be dissociated into 8 positive and negative ions, so that a plurality of monomer-structure macromolecular reticular complexes can be formed with a plurality of metal ions, the macromolecular reticular complexes are dispersed in water loosely, and the ethylene diamine tetramethylene phosphonic acid and the salt water solution thereof are non-toxic, pollution-free and extremely strong in temperature resistance, and still have remarkable corrosion inhibition and hard water resistance at the temperature of more than 200 ℃. The formula of the invention introduces the substances to complex with high-valence iron ions in the solution and calcium and magnesium ions in water, thereby reducing the corrosivity on one hand and enabling the prepared water to be high-hardness water on the other hand.
The invention also protects the application of the ammonium persulfate corrosion inhibitor, and the prepared ammonium persulfate corrosion inhibitor is added into an ammonium persulfate solution with the mass concentration of 3-5% in a mass percentage of 0.3-2% and is used in an environment of 60 ℃.
Compared with the prior art, the ammonium persulfate corrosion inhibitor has the following technical characteristics:
1. weakly acidic. The weak acid corrosion inhibitor is added into the ammonium persulfate solution to reduce the hydrolysis of the ammonium persulfate, thereby ensuring the strong oxidizing property of the ammonium persulfate.
2. Strong corrosion inhibition. Generally, the corrosion inhibitor can meet the corrosion inhibition effect of the operation in an environment of 60 ℃ within 4 hours of the operation.
3. And (4) safety. The raw materials used by the corrosion inhibitor are odorless and nontoxic, and the corrosion inhibitor is safe and convenient to construct.
Detailed Description
Example 1:
the corrosion inhibitor is prepared by the following steps: 3% of sodium molybdate, 10% of borax, 10% of tartaric acid, 2% of phytic acid, 5% of ethylene diamine tetramethylene phosphonic acid sodium and the balance of water.
A liquid preparation tank: a metal or plastic reservoir;
the method comprises the following specific operations: the prepared corrosion inhibitor is added into 3 percent ammonium persulfate solution with the concentration of 0.3 percent and is pumped into a 60 ℃ seabed layer through an oil pipeline to act on the organic micelle substances.
The effect is as follows: after 4 hours, a dense gray black film layer is formed on the surface of the N80 carbon steel test piece. Even if the test piece is put into a 20% sodium chloride solution, the test piece still has no corrosion phenomenon for 48 hours under the condition of 80 ℃.
Example 2:
the proportion of the cleaning agent is as follows: 3% of sodium molybdate, 6% of sodium silicate, 3% of citric acid, 10% of ethylene diamine tetramethylene phosphonic acid sodium and the balance of water.
Cleaning liquid container: a plastic or metal reservoir;
the concrete practical operation is as follows: the prepared corrosion inhibitor is added into 5 percent ammonium persulfate solution with the concentration of 2 percent and is pumped into a 60 ℃ seabed layer through an oil pipeline to act on the organic micelle substances.
The effect is as follows: after 4 hours, a dense gray black film layer is formed on the surface of the N80 carbon steel test piece. Even if the test piece is put into a 20% sodium chloride solution, the test piece still has no corrosion phenomenon for 48 hours under the condition of 80 ℃.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (1)
1. The application of the ammonium persulfate corrosion inhibitor in the production oil pipeline of the offshore oilfield is characterized in that the ammonium persulfate corrosion inhibitor is composed of 3-15% of an inorganic passivator, 1-3% of organic carboxylic acid, 1-10% of a metal ion inhibitor and the balance of water in percentage by mass; the inorganic passivator is a composition of molybdate and borax or sodium silicate, wherein molybdate is indispensable; the molybdate is sodium molybdate, and the mass ratio of borax or sodium silicate to sodium molybdate is more than 2: 1; the organic carboxylic acid is one, two or three of tartaric acid, gluconic acid and citric acid; the metal ion inhibitor is selected from one or more of phytic acid, ethylene diamine tetramethylene phosphonic acid and salts thereof; the ammonium sulfate corrosion inhibitor is added into an ammonium persulfate solution with the mass concentration of 3-5% in a mass percentage of 0.3-2%, and is used in an environment of 60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711191948.XA CN109837546B (en) | 2017-11-24 | 2017-11-24 | Ammonium persulfate corrosion inhibitor used in production oil pipeline of offshore oil field and application thereof |
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| CN201711191948.XA CN109837546B (en) | 2017-11-24 | 2017-11-24 | Ammonium persulfate corrosion inhibitor used in production oil pipeline of offshore oil field and application thereof |
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| CN109837546A CN109837546A (en) | 2019-06-04 |
| CN109837546B true CN109837546B (en) | 2021-06-08 |
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| CN115584496A (en) * | 2022-10-25 | 2023-01-10 | 福建省长汀金龙稀土有限公司 | Surface treatment method for permanent magnet, permanent magnet and protective film thereof |
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| US20030134973A1 (en) * | 2002-01-15 | 2003-07-17 | Chen Robert Gow-Sheng | Waterborne latexes for anti-corrosive and solvent-resistant coating compositions |
| CN100441526C (en) * | 2006-09-07 | 2008-12-10 | 武汉钢铁(集团)公司 | Long effective environmental protection type corrosion inhibitor for inclosed recirculated cooling water |
| CN101492818A (en) * | 2008-01-24 | 2009-07-29 | 宝山钢铁股份有限公司 | Rust preventive for parkerizing treatment and method of use thereof |
| CN103695927A (en) * | 2013-12-23 | 2014-04-02 | 奇瑞汽车股份有限公司 | Corrosion inhibitor |
| CN103993322B (en) * | 2014-06-03 | 2016-05-11 | 如皋市金陵化工有限公司 | A kind of preparation method of copper inhibitor |
| CN104277777A (en) * | 2014-09-17 | 2015-01-14 | 青岛市高科专利技术转移平台有限公司 | Anti-scaling compounded anti-freezing fluid for locomotive |
| CN104562042A (en) * | 2015-01-13 | 2015-04-29 | 衡阳师范学院 | Efficient and environment-friendly molybdenum-series steel corrosion inhibitor in running water medium |
| CN105177591A (en) * | 2015-06-25 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Natural seawater molybdate carbon steel composite corrosion inhibitor |
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