CN109837546A - Ammonium persulfate corrosion inhibiter and its application used in a kind of offshore oilfield extraction oil-piping - Google Patents
Ammonium persulfate corrosion inhibiter and its application used in a kind of offshore oilfield extraction oil-piping Download PDFInfo
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- CN109837546A CN109837546A CN201711191948.XA CN201711191948A CN109837546A CN 109837546 A CN109837546 A CN 109837546A CN 201711191948 A CN201711191948 A CN 201711191948A CN 109837546 A CN109837546 A CN 109837546A
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- ammonium persulfate
- corrosion inhibiter
- acid
- molybdate
- piping
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Abstract
The present invention relates to ammonium persulfate corrosion inhibiter and its applications used in a kind of offshore oilfield extraction oil-piping, it is compounded by a certain percentage by inorganic passivant, organic carboxyl acid, Metal Ion Inhibitor and water, the corrosion inhibiter is under the conditions of 60 DEG C, for 0.3%~2% additive amount in 3%~5% ammonium persulfate solution, corrosion mitigating effect is excellent.
Description
Technical field
The invention belongs to petroleum additive technical fields, and in particular to mistake used in a kind of offshore oilfield extraction oil-piping
Ammonium sulfate corrosion inhibiter and its application.
Background technique
Seabed production device: using the method for boring underwater well head, well head is mounted on seabed, the oil gas pipeline produced
It is routed directly to land or input seabed collection oil-gas facility.In oil extraction process, due to the heterogeneity on stratum, water is often generated
Leaching problem needs to carry out water blockoff, its essence is the seepage state of water in the earth formation is changed, reduces oil field production water, holding to reach
Stratum energy, the purpose for improving oil field ultimate recovery.The water shutoff agent wherein used, the most commonly used is the poly- of various high molecular weight
Acrylamide flocculating agent substance, such polymer, in 60 DEG C of the temperature condition in seabed, in petroleum it is complicated at
Easily formation glue granulated substance is divided on the one hand to influence subsequent exploitation petroleum if not handling for a long time in underground, on the one hand will cause water quality
Pollution.
The micelle substance is handled, it is most effective and do not generate obvious smell is 3% ammonium persulfate aqueous solution at present.It should
Method is the strong oxidizing property using ammonium persulfate, aoxidizes the polymer in micelle, makes its degradation.But marine ammonium sulfate
The storage of solution and conveying equipment contain metal material mostly, and most is N80 carbon steel, and ammonium persulfate once contacts carbon steel, i.e.,
Make at normal temperature, is just oxidized to Fe within Fe a few minutes therein3+, Fe3+Appearance, and continue accelerate Fe corrosion, half is small
When within, the pitting corrosion that carbon steel surface just occurs, aqueous solution becomes reddish yellow, therefore, it is necessary to which being added in ammonium persulfate solution has
The corrosion inhibiter of effect is to alleviate its corrosion to carbon steel.Inspection information has no the relevant report of ammonium persulfate corrosion inhibiter.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides to be made in a kind of offshore oilfield extraction oil-piping
Ammonium persulfate corrosion inhibiter and its application.
The present invention adopts the following technical scheme: ammonium persulfate corrosion inhibiter used in a kind of offshore oilfield extraction oil-piping,
It being made of formula as below, inorganic passivant 3~15%, organic carboxyl acid 1~3%, Metal Ion Inhibitor 1~10%, remaining is water,
Based on mass fraction.
Further, the inorganic passivant is the composition of molybdate and borax or sodium metasilicate, wherein molybdate is not
It can lack, preferably sodium molybdate.The mass ratio of borax or sodium metasilicate and sodium molybdate is greater than 2:1.Experiment discovery, molybdate in boron
It is stronger to the rust inhibition of carbon steel under the conditions of acid group or silicate are existing.
The organic carboxyl acid is one of tartaric acid, gluconic acid, citric acid, two or three of combination.Addition has
The purpose of machine acid is to guarantee the weak acid environment after ultimately joining in ammonium persulfate solution, because ammonium persulfate is in alkaline solution
Facile hydrolysis and weaken its oxidisability.Why organic carboxyl acid is selected, it is main to consider not introduce phosphorus, ammonia nitrogen etc. and technology in formula
Green Development requires the substance runed counter to, and tartaric acid therein, grape acid, citric acid is selected to be primarily due to its not only dissolubility
Good, preparation conveniently, and has certain rust inhibition, therefore a kind of helper component as corrosion inhibiter, to inhibition of the invention
The rust inhibition of agent has positive synergistic effect.
The Metal Ion Inhibitor is neutral or acidic materials, preferably phytic acid, ethylenediamine tetramethylene phosphonic acid and its
One of salt is a variety of.Phytic acid is widely present in vegetable seeds, belongs to natural nutriment, and most significant feature is and metal
Ion plays the role of extremely strong complexing and plays and inhibit free metal ion；Ethylenediamine tetramethylene phosphonic acid and its saline solution
In can be dissociated into 8 negative ions, thus multiple netted complex compounds of monomer structure macromolecular can be formed with multiple metal ions,
It is loosely dispersed in water, and nontoxic and pollution-free, temperature tolerance is extremely strong, and 200 DEG C or more still have significant rust inhibition and resist hard
It is aqueous.Inventive formulation introduces substance of this kind, it is complexed with the calcium ions and magnesium ions in the ferric ion and water in solution, a side
Face reduces corrosivity, on the other hand makes to prepare water be high hardness water.
The present invention also protects the application of the ammonium persulfate corrosion inhibiter, by ammonium sulfate corrosion inhibiter obtained above with 0.3%-
2% mass percent is added to the ammonium persulfate solution of 3%-5% mass concentration, and uses in the environment of 60 DEG C.
Compared with prior art, there is following technical characterstic using ammonium persulfate corrosion inhibiter of the invention:
1, faintly acid.Faintly acid corrosion inhibiter is added in ammonium persulfate solution, the hydrolysis of ammonium persulfate is reduced, to guarantee its strong oxygen
The property changed.
2, strong rust inhibition.General 4 hours of construction operation, 60 DEG C of environment, the corrosion inhibiter meet the slow of the operation enough
Lose effect.
3, safety.Raw material used in the corrosion inhibiter is odorless nontoxic, and construction safety is convenient.
Specific embodiment
Embodiment 1:
Corrosion inhibiter proportion: sodium molybdate 3%, borax 10%, tartaric acid 10%, phytic acid 2%, sodium ethylenediamine tetramethylenephosphonate 5%, remaining
For water.
Liquid pool: metal or plastics reservoir；
Concrete operations: the corrosion inhibiter prepared is added in 3% ammonium persulfate solution with 0.3% concentration, is beaten by petroleum pipeline
The subsea level for entering 60 DEG C acts on organic micelle substance.
Effect: after 4 hours, N80 carbon steel strip forms one layer of fine and close grey black film layer.Even if the test piece is put into
In 20% sodium chloride solution, under conditions of 80 DEG C, 48h still corrosion-free phenomenon.
Embodiment 2:
Cleaning agent proportion: sodium molybdate 3%, sodium metasilicate 6%, citric acid 3%, sodium ethylenediamine tetramethylenephosphonate 10%, remaining is water.
Soda liquor container: plastics or metal reservoir；
Specific practical operation is made: the corrosion inhibiter prepared being added in 5% ammonium persulfate solution with 2% concentration, is beaten by petroleum pipeline
The subsea level for entering 60 DEG C acts on organic micelle substance.
Effect: after 4 hours, N80 carbon steel strip forms one layer of fine and close grey black film layer.Even if the test piece is put into
In 20% sodium chloride solution, under conditions of 80 DEG C, 48h still corrosion-free phenomenon.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be determined by the scope of protection defined in the claims.
Claims (7)
1. ammonium persulfate corrosion inhibiter used in a kind of offshore oilfield extraction oil-piping, which is characterized in that it is made of formula as below,
Inorganic passivant 3~15%, organic carboxyl acid 1~3%, Metal Ion Inhibitor 1~10%, remaining is water, based on mass fraction.
2. ammonium persulfate corrosion inhibiter according to claim 1, which is characterized in that the inorganic passivant be molybdate and
The composition of borax or sodium metasilicate, wherein molybdate is indispensable.
3. ammonium persulfate corrosion inhibiter according to claim 2, which is characterized in that the molybdate is sodium molybdate, borax
Or the mass ratio of sodium metasilicate and sodium molybdate is greater than 2:1.
4. ammonium persulfate corrosion inhibiter according to claim 1, which is characterized in that the organic carboxyl acid is tartaric acid, Portugal
Grape saccharic acid, a kind of in citric acid, two or three of combination.
5. ammonium persulfate corrosion inhibiter according to claim 1, which is characterized in that the Metal Ion Inhibitor is neutrality
Or acidic materials.
6. ammonium persulfate corrosion inhibiter according to claim 5, which is characterized in that the Metal Ion Inhibitor, which is selected from, plants
One of acid, ethylenediamine tetramethylene phosphonic acid and its salt are a variety of.
7. the application of ammonium persulfate corrosion inhibiter according to claim 1 to 6, which is characterized in that by the sulphur
Sour ammonium corrosion inhibiter is added to the ammonium persulfate solution of 3%-5% mass concentration with the mass percent of 0.3%-2%, and in 60 DEG C of ring
It is used under border.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 true CN109837546A (en) | 2019-06-04 |
| CN109837546B CN109837546B (en) | 2021-06-08 |
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Cited By (1)
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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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| CN109837546B (en) | 2021-06-08 |
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