CN103808607A - Corrosion inhibition property test method for corrosion inhibitor applied to sodium chloride well completion liquid system - Google Patents
Corrosion inhibition property test method for corrosion inhibitor applied to sodium chloride well completion liquid system Download PDFInfo
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- CN103808607A CN103808607A CN201210483429.1A CN201210483429A CN103808607A CN 103808607 A CN103808607 A CN 103808607A CN 201210483429 A CN201210483429 A CN 201210483429A CN 103808607 A CN103808607 A CN 103808607A
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- completion fluid
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Abstract
The invention discloses a corrosion inhibition property test method for corrosion inhibitor applied to a sodium chloride well completion liquid system, comprising the following steps: (a) configuring a sodium chloride well completion liquid for later use; (b) processing an experimental test block, measuring the size and recording data; (c) placing the sodium chloride well completion liquid into an experimental container; (d) adding a corrosion inhibitor, regulating pH value to 7.0-9.0; (e) placing into the experimental container, then placing the experimental container into thermostatic water bath at 80-100 DEG.C to corrode for 48-96 hours; (f) washing and removing rust; (9) cleaning the experimental test block, drying in a dryer to constant weight, weighing and recording the data; (h) computing the corrosion rate of the experimental test block according to the measured data so as to obtain the corrosion inhibition property of the corrosion inhibitor. According to the invention, the corrosion inhibition property of the corrosion inhibitor applied to the sodium chloride well completion liquid system can be fast determined, the test result is accurate, the test steps are simple, the test cost is low, and theoretical basis is provided for the corrosion inhibitor applied to the sodium chloride well completion liquid system.
Description
Technical field
The present invention relates to the corrosion inhibition method of testing that a kind of corrosion inhibiter is applied to sodium chloride completion fluid system.
Background technology
In petroleum industry, corrosion inhibiter compounds is mainly used as extreme pressure antiwear agent for lubricant oil, high-temperature antioxidant.Because can making the catalyst poisoning of engine exhaust conversion equipment, the P elements in the dithiophosphates class lubricating oil antiwear additive generally using now lost efficacy, moreover consideration based on environmental protection aspect, various countries have all made strict regulation to the content of phosphorus in the lubricating oil such as machine oil, require to use low ash, low-phosphorous lubricating oil.Corrosion inhibiter compounds is because having excellent extreme-pressure anti-wear and high-temperature oxidation resistance, and phosphorus element-containing not, and toxicity is low, is expected to become the substitute products of dithiophosphates class lubricating oil antiwear additive.To a study hotspot that synthesizes and become as the applied research of lubrication oil antiwear antioxidant current oil dope of novel corrosion inhibitor compounds.
At present, corrosion inhibiter and derivant thereof are widely used in the fields such as rubber, oil, agricultural, mining industry, medicine, environmental protection and analytical chemistry as degreaser, water quality cleansing agent, antisludging agent, film forming agent and resistance to compression adjuvant etc.After, the application of such material will further expand.
In rubber industry, corrosion inhibiter compounds is mainly as thiofide.It promotes that sulfuration effect is very large, as the second promoter and time sulfonephthalein amine vulcanization accelerator use, can shorten cure time, and its consumption is only second to time sulfonephthalein amine type accelerator at present.
In plastics industry, the application of corrosion inhibiter compounds mainly contains two aspects.The initiating agent while being used as high molecular polymerization on the one hand.Corrosion inhibiter can be controlled the putting in order and the stereoregularity of some polymkeric substance etc. of molecular weight, molecular weight distribution, end-group structure, side group structure, monomer of resulting polymers effectively as photoactivation type agent, also can by MOLECULE DESIGN synthesize diversified, there is the multicomponent copolymer of particular characteristic or function and have particular geometry Model Polymers etc.; Be as plastics antioxidant and light degradation sensitizer on the other hand, study at most as plastics photodissociation sensitizer with aminodithioformic acid iron class material.
In mining industry, corrosion inhibiter compounds is mainly as flotation collector.Dialkyl group corrosion inhibiter compounds is a kind of metal sulfide collecting agent efficiently, has the features such as collecting ability is strong, selectivity is high, dosage is few, flotation speed is fast.Be commonly used for the flotation collector of the mineral such as galenite, chalcopyrite.As being used for carrying out galenite and sphalerite, pyritous flotation separation under sodium diethyldithiocarbamate (No. nine, sulphur nitrogen) the high-alkali condition of being everlasting, it is to the stronger collecting effect of galenite performance.
In agricultural, corrosion inhibiter compounds is mainly as disinfectant use in agriculture.Through the development of decades, develop the germifuge such as fervam, ziram, thiram, Dithane A40, zineb, maneb and Mancozeb, what wherein purposes was the widest is Mancozeb.
Medically, if corrosion inhibiter classization gold owner is as the toxinicide of heavy metal poisoning, as anticancer, as immunomodulator, medical antioxidant and external application germifuge.
In analytical chemistry, corrosion inhibiter compounds is mainly as extraction complexing agent, for separation and the preenrichment of chromatogram, spectral analysis.Can be used for analyzing the microanalysis of the various metals such as arsenic, chromium, lead, copper, nickel, zinc, manganese, silver and nonmetalloid.
Except in and the water treatment agent of performance, the inhibition mechanism of the corrosion inhibiter that most of water treatment is used is to form the metal protective film that one deck is isolated metal and water in metal surface contact with water, to reach inhibition object.The type of the diaphragm forming according to corrosion inhibiter, corrosion inhibiter can be divided into type oxide film, deposition membranous type and absorption membranous type corrosion inhibiter.
Chromate, nitrite, molybdate, tungstate, vanadate, orthophosphate, borate etc. are all counted as type oxide film corrosion inhibiter.Chromate and nitrite are all strong oxidizers, without the help of oxygen in water can with metal reaction, form the oxide film of one deck densification in anodic site, metal surface.Remaining is several, or because of a little less than oxidability own, or because of own and non-oxidiser, all need the help of oxygen to form oxide film in metal surface.Because these type oxide film corrosion inhibiter are that anodic process by preventing corrosion reaction reaches inhibition, these anodic corrosion inhibitors can form oxide or oxychloride at anode and Action of Metal Ions.Deposition covers and on anode, forms diaphragm; take chromate as example; it forms Cr (OH) 3 and Fe (OH) 3 in anode reaction, and the potpourri (being mainly γ-Fe2O3) that becomes CrO3 and Fe2O3 after dehydration forms diaphragm at anode.Therefore be sometimes known as again anodic corrosion inhibitor or dangerous type corrosion inhibiter, because they are once underdosage (inhibition separately, process 1L water, required dosage often up to hundreds of, even cross thousand milligrams) will cause spot corrosion, make original not too serious etching problem, become on the contrary more serious.Chlorion, high temperature and high water flow velocity all can destroy oxide film, thus in the time of application, be according to process conditions, the concentration of appropriate change corrosion inhibiter.Silicate also can be grouped in this class roughly, reaches inhibition because it is also mainly anodic process by preventing corrosion reaction.But, it be not by with metallic iron itself, face may be interacted by the corrosion product of silicon dioxide and iron, carry out film forming with absorption mechanism.
In environmental protection, because corrosion inhibiter compounds has polar group, the sulphion atomic radius in this polar group is larger, electronegative, be easy to waste water in metal cation Cheng Jian, generate the corrosion inhibiter of indissoluble, therefore, be commonly used for extraction intercalating agent.Be mainly used in two aspects.Make precipitate flotation agent and solvent sublation collecting agent with low-molecular-weight corrosion inhibiter on the one hand, separate the heavy metal ion in wastewater treatment and be used as the complexing agent in supercritical fluid chelating extraction.Moreover be that amino two thiocarbonyls are introduced to polystyrene polymethacrylate derivative, contained in the high molecular polymer such as polymkeric substance and the polyethers skeleton of polyethylene polyamine, preparation has chelate resin or the water miscible chelate resin of certain physical strength.Water miscible corrosion inhibiter chelate resin is the novel oilfield sewage-treating agent growing up in the U.S. nineteen nineties, has efficient degreasing performance, also has the functions such as sterilization, antiscale, inhibition simultaneously.
The most of oil field of China has all adopted waterflooding mode at present.Along with the carrying out of oil-field flooding, processing and the re-injection of oilfield sewage more and more come into one's own.Corrosive pipeline is one of the most serious problem running in the processing of oilfield sewage and re-injection process.Because oil-contaminated water of oil field water quality complexity, contain that many salinity is higher to steel objectionable constituent, contain dissolving salt and dissolved oxygen DO etc., behind such produced-water reinjection stratum, can produce serious corrosion to the hardware in waterflood system and pipeline.The approach of Control and prevention corrosion has a variety of, and oil field mainly adopts interpolation corrosion inhibiter to solve this problem.This is the corrosion inhibition under different salinity conditions with regard to necessary research.
Well completion fluid always just receives domestic and international concern to corrosion of metal problem.Because in well-completion practice process, the steel equipment such as sand string, oil pipe and subsurface tool are also subject to well completion fluid corrosion.Particularly; need a large amount of well completion fluids in ocean operation well-completion practice; in the time of preparation well completion fluid; to add various salt according to stratum rock property and pressure; in the solid free brine well completion fluid using; contain the salt such as NaCl, CaCl2, MgCl2, ZnCl2, KCl, KBr, CaBr2 and ZnBr2 and for all causing Oil/gas Well tubing and down-hole metal equipment corrosion in order to protect Oil in Super-low Permeability, the complexity of ultralow hole oil reservoir, special reservoir to design completion fluid system; sometimes also may cause the sudden break accident of downhole tubular goods, cause serious economic loss.And the essence of metal erosion is that metal is by causing metal destroyed with surrounding medium generation chemical action or electrochemical action.Therefore in oil gas well completion operation process, especially carry out well-completion practice at high temperature deep well and ultra deep well, one of vital task is to solve the etching problem of well completion fluid to sleeve pipe, oil pipe and down-hole hardware.Therefore,, in the selection of well-completion practice fluid, except operation itself, that the characteristic of completion fluid system be there are certain requirements to corrosion research and the metal protection work of completion fluid system to metal material is also extremely important.Be reduced to Min. for well completion fluid is corroded to the loss causing, researcher creates and has developed a lot of anti-corrosion methods, and adding corrosion inhibiter is effectively most economical and method the most easily.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the corrosion inhibition method of testing that provides a kind of corrosion inhibiter to be applied to sodium chloride completion fluid system, this assay method energy Quick Measuring is made corrosion inhibiter and is applied to the corrosion inhibition of sodium chloride completion fluid system, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for corrosion inhibiter is applied to sodium chloride completion fluid system.
Object of the present invention is achieved through the following technical solutions: a kind of corrosion inhibiter is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, comprising: (a) first, configuration sodium chloride well completion fluid is for subsequent use; (b) machining experiment test piece, and measure its size, record data; (c) then, get a certain amount of sodium chloride well completion fluid and be placed in experiment container; (d) in experiment container, add a certain amount of corrosion inhibiter, and to regulate its pH value be 7.0～9.0; (e) experiment test piece is placed in to experiment container, is then placed in the water bath with thermostatic control of 80～100 ℃, corrosion reaction 48～96h; (f) take out experiment test piece and rinse, put it in rust remover and soak and eliminate rust; (g) the experiment test piece after rust cleaning is cleaned, and put into exsiccator to constant weight, weigh respectively and write down data; (h), according to the data that record, calculate respectively the rate of corrosion of experiment test piece, thereby draw the corrosion inhibition of corrosion inhibiter.
In described step (d), also comprise cleaning step: get test piece and put into the vessel that fill sherwood oil, remove test piece surface contaminants with absorbent cotton, and twice of continuous wash.
Described test piece is dried by dryer, and baking temperature is 100 ℃.
Described well completion fluid is that seawater is the completion liquid that base fluid increases the weight of with sodium chloride.
Described temperature of reaction is 90 ℃.
In described step (d), regulating its pH value is 8.0.
In described step (e), be placed in the water bath with thermostatic control of 90 ℃, corrosion reaction 72h.
In sum, the invention has the beneficial effects as follows: can Quick Measuring make corrosion inhibiter and be applied to the corrosion inhibition of sodium chloride completion fluid system, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for corrosion inhibiter is applied to sodium chloride completion fluid system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of corrosion inhibiter corrosion inhibition.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
A kind of corrosion inhibiter the present invention relates to is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, comprising: (a) first, configuration sodium chloride well completion fluid is for subsequent use; (b) machining experiment test piece, and measure its size, record data; (c) then, get a certain amount of sodium chloride well completion fluid and be placed in experiment container; (d) in experiment container, add a certain amount of corrosion inhibiter, and to regulate its pH value be 7.0～9.0; (e) experiment test piece is placed in to experiment container, is then placed in the water bath with thermostatic control of 80～100 ℃, corrosion reaction 48～96h; (f) take out experiment test piece and rinse, put it in rust remover and soak and eliminate rust; (g) the experiment test piece after rust cleaning is cleaned, and put into exsiccator to constant weight, weigh respectively and write down data; (h) according to the data that record, calculate respectively the rate of corrosion of experiment test piece, draw the corrosion inhibition of corrosion inhibiter from face.
In described step (d), also comprise cleaning step: get test piece and put into the vessel that fill sherwood oil, remove test piece surface contaminants with absorbent cotton, and twice of continuous wash.
Described well completion fluid is that seawater is the completion liquid that base fluid increases the weight of with sodium chloride.
The environmental requirement of the present embodiment simulation oil field, take the NaCl of seawater preparation as weighting agent and HCS clay stabilizer, BPA envelope lost circulation additive, CD-1 scale inhibitor, the formulated well completion fluid of CMHEC thickening agent, consider that pH value is larger, well completion fluid corrosive medium system is less to the corrosion of steel, this experiment just determines that pH value is 8.0, under different densities, different completion fluid system condition, study the corrosion inhibition of corrosion inhibiter to steel, experiment condition: temperature is 90 ℃, time is 72h, pH value is 8.0, DTC-1 dosage is 140mg/L, and experimental result is as shown in following table and Fig. 1:
From upper table and Fig. 1: in NaCl completion fluid system, corrosion inhibiter can obviously reduce the corrosion of this corrosive medium to steel, may be also because having alleviated the corrosion to steel with other adjuvants synergies.And corrosion rate is along with the increasing of density obviously reduces, corrosion inhibition rate is also more than 50%, and this also illustrates that DTC-1 and other well completion fluid adjuvants are compatibilities in performance, and corrosion inhibition is good.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.
Claims (7)
1. corrosion inhibiter is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, comprising: (a) first, configuration sodium chloride well completion fluid is for subsequent use; (b) machining experiment test piece, and measure its size, record data; (c) then, get a certain amount of sodium chloride well completion fluid and be placed in experiment container; (d) in experiment container, add a certain amount of corrosion inhibiter, and to regulate its pH value be 7.0～9.0; (e) experiment test piece is placed in to experiment container, is then placed in the water bath with thermostatic control of 80～100 ℃, corrosion reaction 48～96h; (f) take out experiment test piece and rinse, put it in rust remover and soak and eliminate rust; (g) the experiment test piece after rust cleaning is cleaned, and put into exsiccator to constant weight, weigh respectively and write down data; (h), according to the data that record, calculate respectively the rate of corrosion of experiment test piece, thereby draw the corrosion inhibition of corrosion inhibiter.
2. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, in described step (d), also comprise cleaning step: get test piece and put into the vessel that fill sherwood oil, remove test piece surface contaminants with absorbent cotton, and twice of continuous wash.
3. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, described test piece is dried by dryer, and baking temperature is 100 ℃.
4. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, described well completion fluid is that seawater is the completion liquid that base fluid increases the weight of with sodium chloride.
5. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, described temperature of reaction is 90 ℃.
6. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, in described step (d), regulating its pH value is 8.0.
7. corrosion inhibiter according to claim 1 is applied to the corrosion inhibition method of testing of sodium chloride completion fluid system, it is characterized in that, in described step (e), is placed in the water bath with thermostatic control of 90 ℃, corrosion reaction 72h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525733A (en) * | 2017-08-09 | 2017-12-29 | 中国石油化工股份有限公司 | Well head downhole corrosion speed correlation model algorithm and the downhole corrosion speed on-line monitoring method using this algorithm |
| CN113930231A (en) * | 2021-12-17 | 2022-01-14 | 中海油田服务股份有限公司 | Water-based well completion fluid and preparation and application thereof |
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- 2012-11-13 CN CN201210483429.1A patent/CN103808607A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525733A (en) * | 2017-08-09 | 2017-12-29 | 中国石油化工股份有限公司 | Well head downhole corrosion speed correlation model algorithm and the downhole corrosion speed on-line monitoring method using this algorithm |
| CN113930231A (en) * | 2021-12-17 | 2022-01-14 | 中海油田服务股份有限公司 | Water-based well completion fluid and preparation and application thereof |
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Application publication date: 20140521 |