CN108008076A - A kind of flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter - Google Patents
A kind of flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter Download PDFInfo
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- CN108008076A CN108008076A CN201711265991.6A CN201711265991A CN108008076A CN 108008076 A CN108008076 A CN 108008076A CN 201711265991 A CN201711265991 A CN 201711265991A CN 108008076 A CN108008076 A CN 108008076A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/82—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a precipitate or turbidity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The present invention relates to a kind of flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter, belong to technical field of oil production engineering.Its flow includes：1) producing well corrosive conditions parameter is collected；2) collect satisfactory corrosion inhibiter and it is numbered；3) compatibility experiments are carried out to the corrosion inhibiter of collection, filters out the corrosion inhibiter good with live water-compatible；4) corrosion inhibiter of corrosion inhibition rate ＞ 90% is quickly filtered out using electrochemical corrosion detection method；5) consider unlike material and phase, the corrosion inhibiter filtered out in step 4) is evaluated using static state high-temperature autoclave, filters out the corrosion inhibiter for meeting corrosion rate≤0.076mm/a；6) live oil mixing with water flow operating mode is simulated, the corrosion inhibiter of screening in step 5) is further evaluated using the dynamic high temperature autoclave of height difference tube runs, determines the corrosion inhibiter and numbering for meeting corrosion rate≤0.076mm/a.Screening process provided by the invention, efficiently can quickly filter out the corrosion inhibiter for meeting live requirement for anticorrosion.
Description
Technical field
The present invention provides a kind of flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter, belong to petroleum production engineering
Technical field.
Background technology
At present, most of Oil Fields are using note CO2The method of drive is recovered the oil, and CO2Injection can cause in producing well
Oil pipe, casing, the etching problem of sucker rod.In oil recovery process, the corrosive medium being primarily present has CO2Deng sour gas and oil
Water in field, the method for adding high-efficient corrosion inhibitor into the producing well containing corrosive medium because taking is highly effective.
The problem of being selected for corrosion inhibiter in down-hole string and oil production equipment antiseptic project, domestic and foreign scholars have carried out largely
Research work, and obtain many beneficial achievements.Such as Chinese patent literature is disclosed " containing corrosive dissolution gas medium
Buffering agent evaluation apparatus " (publication number：CN 204116303U, publication date：2015.01.21), " cleaning hydrochloric acid and corrosion inhibiter
Evaluation method and its working solution " (publication number：CN 103175830A, publication date：2013.06.26) etc., all it is to corrosion inhibiter
Single evaluation method.
It is suitable for CO at present2The corrosion inhibiter species of corrosion is various, how quickly to filter out the efficiently slow of suitable field working conditions
Erosion agent is to prevent the key issue of pit shaft corrosion, therefore the present invention provides a kind of fast selecting for this problem and evaluation is slow
Lose the method for agent performance.
The content of the invention
The problem of the technical problem to be solved in the present invention is for the filling of producing well corrosion inhibiter, and one kind is provided and is suitable for
The flow that carbon dioxide drive oil production well corrosion inhibiter quickly screens.
To achieve the above object, the present invention uses following technical scheme：
A kind of flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter, it is characterised in that：Plan is adopted first
Corrosion inhibiter carries out Compatibility Evaluation, then further filters out corrosion inhibition rate more than 90% using electrochemical corrosion detection method
Corrosion inhibiter, finally simulate that producing well is static and Dynamic Corrosion operating mode Integrated Selection go out to meet the inhibition of oil field corrosion control index
Agent, specifically includes following steps：
(1) the corrosive conditions parameter of oil well is collected, is specifically included：Chloride ion content, CO2Partial pressure, temperature in wellbore,
Flow velocity, pit shaft Phase velocity map and oil-water ratio；
(2) according to oil field corrosive conditions parameter, the corrosion inhibiter species for meeting corrosive conditions is collected, and it is numbered；
(3) Compatibility Evaluation is carried out to the corrosion inhibiter of collection, specific experiment step is as follows：
A. water-soluble experiment：Thermostat water bath power supply is first connected during experiment, is warming up to 60 DEG C, 90ml scenes are measured with graduated cylinder
Produced Liquid, adds in 100ml color-comparison tubes, adds the corrosion inhibiter sample of 10ml into color-comparison tube with pipette, will be slow
Erosion agent is made into the solution that volume fraction is 10%, covers bottle stopper, shakes 5min, is uniformly mixed it, will be uniformly mixed containing slow
The color-comparison tube of erosion agent aqueous solution is put into the water-bath of constant temperature；Observe respectively and record showing for 30min and 24h after constant temperature
As, be in homogeneous, the transparent judgment criterion for favorable solubility with solution during constant temperature 30min and constant temperature 24h, with constant temperature 30min and
Solution has uneven liquid pearl or particle in the homogeneous judgment criterion good for dispersed phase with solution during constant temperature 30min during constant temperature 24h
Solution layering or have a judgment criterion for being precipitated as dissolubility and bad dispersibility when distribution, constant temperature 24h, dissolubility to corrosion inhibiter and
Dispersiveness is evaluated；
B. emulsification tendency determination experiment：The corrosion inhibitor solution of 1000mg/L is prepared with live Produced Liquid, connects water bath with thermostatic control
Power supply, is warming up to 60 DEG C, be separately added into 2 100ml color-comparison tubes the corrosion inhibiter containing 1000mg/L live Produced Liquid or
Live Produced Liquid 50ml without corrosion inhibiter, crude oil 50ml, covers bottle stopper, and color-comparison tube is put into the water-bath of constant temperature,
After constant temperature 30min, it will be placed into after the colorimetric cylinder up-down vibration 200 times for filling mixed liquor in water-bath；During record standing 10min
Oil-water interfaces delamination, observation oil phase, water mutually emulsify degree, and when recording 60min blank group oil-water ratio V1, add corrosion inhibiter
The oil-water ratio V of group2, compare plus the oil-water ratio of corrosion inhibiter and blank group experiment, oil-water interfaces are clear, stand during standing 10min
V during 60min1≥V2For judgment criterion of the corrosion inhibiter without emulsification tendency, the emulsification tendency to corrosion inhibiter is evaluated；
C. tested and emulsification tendency determination experiment is as a result, filter out and good slow of live Produced Liquid compatibility according to water-soluble
Agent is lost, and records corresponding numbering；
(4) corrosion inhibiter that compatibility is good in electrochemical corrosion detection method evaluation procedure (3) is used, it is big to filter out corrosion inhibition rate
It is as follows in 90% corrosion inhibiter, experimental procedure：
A. solution and container prepare：1000ml scenes Produced Liquid first is being added into three neck round bottom before experiment, is being continued
It is passed through CO2Gas 2h, then adds 200ppm corrosion inhibiter uniform stirrings；
B. electrode material prepares：The working electrode of electrochemistry experiment is floor space 0.7854cm2Cylinder oil pumping pole stock
Matter, uses 200#, 400#, 600#, 800# and 1200# abrasive paper for metallograph is polishing to worksheet step by step successively before experiment by working electrode
Untill face is without obvious cut, then petroleum ether cleaning remove working electrode surface oil stain after, then with washes of absolute alcohol, wipe
The residue for removing working electrode surface is stand-by；Electrochemical evaluation is carried out using three-electrode system, the reference electrode used is full
And calomel electrode, auxiliary electrode are platinum electrode；
C. electrochemistry experiment：Electrochemical evaluation is carried out using electrochemical workstation three-electrode system, first measurement open circuit electricity
Position, parameter during measurement are arranged to scan area 0.7845cm2, time of measuring 30 minutes, then surveys impedance spectrum, finally with dynamic electricity
Bit scan measures polarization curve, and the scanning range of electrokinetic potential scanning polarization curve is -600mV-1000mV, and scan frequency is
0.5mV/s；
D. analysis of experimental data：Every group of dynamic potential scanning curve is fitted, it is according to corrosion current density I and certainly rotten
Erosion current potential E draws out Log ∣ I ∣~E figures, the straight line portion of negative anodic polarization curve is extended, the corresponding abscissa of gained intersection point
It is worth for corrosion current density Icorr, the corrosion inhibition rate of corrosion inhibiter is calculated by formula (1)：
In formula：Icorr.0It is sucker rod material in the corrosion current density of blank Produced Liquid, unit mA/cm2；IcorrFor
Sucker rod material is in the corrosion current density containing corrosion inhibiter Produced Liquid；
E. corrosion inhibiter of the corrosion inhibition rate more than 90% is filtered out as corrosion inhibiter alternative in next step, and records corresponding volume
Number；
(5) corrosion inhibiter screened using static state high-temperature autoclave test to step (4) carries out corrosion weight loss evaluation experimental, sieve
The corrosion inhibiter of corrosion rate≤0.076mm/a is selected, experimental procedure is as follows：
A. three kinds of sucker rod, oil pipe, casing material sizes deoiled for the sample of 30 × 15 × 3mm before experiment, removed
Water, and after being dried completely, then hangs on and adds 500ppm corrosion inhibiter and be not added with the saturation CO of corrosion inhibiter respectively2Produced Liquid
Kettle in, it is at gas-liquid interface in the solution that sample, which is completely immersed in solution as experiment in the liquid phase, the leaching of half sample,
Experiment, sample do not immersed in solution for experiment in the gas phase；
B. simulation field working conditions experiment parameter is set as pit shaft maximum temperature, maximum CO2Partial pressure, maximum chloride ion content,
Corrode in the case where simulating working condition after a week, take out sample, weightless sample is placed in film liquid and is cleaned, to remove specimen surface
Corrosion product, and pass sequentially through deionized water, absolute alcohol rinse, cold wind drying after weigh, corrosion is calculated by formula (2)
Speed：
In formula：V is the corrosion rate of material, unit mma-1；w0With w1The quality of test piece before and after respectively corroding, it is single
Position is g；S be test piece area, unit cm2；ρ is the density of carbon steel, its value is 7.8gcm-3, t is experimental period, unit
For h；
C. corrosion rate is calculated, filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, record sucker rod, oil pipe, casing
The corrosion inhibiter and its numbering that material is met the requirements in three kinds of phaseexperiments of static state high-temperature autoclave；
(6) corrosion inhibiter screened using dynamic high temperature autoclave test to step (5) carries out corrosion weight loss evaluation experimental, into
One step filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, and experimental procedure is as follows：
A. two kinds of sucker rod, oil pipe material sizes deoiled for the sample of 30 × 15 × 3mm before experiment, removed water, and
After being dried completely, then the fixture equipped with sample is put into the tube runs corrosion experimental device with height difference；
Solution is sufficiently mixed grease from being circulated from up to down with certain flow velocity when b. testing, and simulates field working conditions
Experiment parameter is set as live pit shaft maximum temperature, maximum CO2Partial pressure, maximum chlorine ion concentration, it is rotten in the case where simulating working condition
Erosion one week；
C. sample is taken out, weightless sample is placed in film liquid and is cleaned, to remove the corrosion product of specimen surface, and successively
Rinsed by deionized water, absolute alcohol, finally calculate corrosion rate with (2), filter out the slow of corrosion rate≤0.076mm/a
Agent is lost, determines corrosion inhibiter and its numbering met the requirements.
Screening process using the present invention, has following remarkable result：(1) present invention is corroded using height difference tube runs
Experimental method, is tested under the live oil mixing with water flow operating mode of simulation, can approach live actual condition to corrosion inhibiter
Protection effect carries out more accurately assessment；(2) present invention can consider that material will to the sensitiveness of corrosion inhibiter protection effect at the same time
Ask, avoid the drawbacks of being evaluated using mono-material；(3) present invention considers corrosion inhibiter in gas phase, liquid phase, producing well hydrodynamic
Protection effect in a variety of phases in face gas-liquid boundary position, avoids the drawbacks of being evaluated using single phase；(4) it is of the invention
By the screening and assessment of multi-layer multi-angle multi-method, the excellent corrosion inhibiter of protection effect can be quickly filtered out.
Brief description of the drawings
Fig. 1 is to realize the flow chart that corrosion inhibiter of the present invention quickly screens.
Fig. 2 is the polarization curve of electro-chemical test.
Fig. 3 is static state high-temperature autoclave corrosion rate block diagram.
Fig. 4 is dynamic high temperature autoclave corrosion rate block diagram.
Embodiment
It is that the present invention is specifically described by example below.
Example：
The present invention operates completion by below scheme：(1) the corrosive conditions parameter of producing well is collected；(2) collect and meet corrosion
The corrosion inhibiter species of operating mode, and it is numbered；(3) compatibility experiments are carried out to the corrosion inhibiter of collection, filtered out and live water phase
The good corrosion inhibiter of capacitive；(4) corrosion inhibiter of the corrosion inhibition rate more than 90% is further filtered out using electrochemical corrosion detection method；
(5) static state high-temperature autoclave test is utilized, the corrosion inhibiter filtered out to previous step carries out corrosion weight loss evaluation experimental, filters out corruption
Lose the corrosion inhibiter of speed≤0.076mm/a；(6) corrosion inhibiter screened using dynamic high temperature autoclave test to previous step is carried out rotten
Weight loss assessment experiment is lost, determines the corrosion inhibiter and its numbering of corrosion rate≤0.076mm/a, screening process provided by the invention
It efficiently can quickly filter out the corrosion inhibiter for meeting live requirement for anticorrosion.
Specifically screening step is：
Step 1：Collect the corrosive conditions parameter of oil well：Chloride ion content 22000ppm, CO2Partial pressure 4MPa, well
110 DEG C, flow velocity 1m/s of temperature of cylinder, pit shaft Phase velocity map is gas phase, the distribution of gas-liquid interface, liquid phase, oil-water ratio 4：1；
Step 2：According to oil field corrosive conditions parameter, 7 kinds of corrosion inhibiter number consecutivelies for meeting collection corrosive conditions are 1-
No. 7；
Step 3：Compatibility Evaluation is carried out to the 1-7 corrosion inhibiter of collection, specific experiment step is as follows：
A. water-soluble experiment：Thermostat water bath power supply is first connected during experiment, is warming up to 60 DEG C, 90ml scenes are measured with graduated cylinder
Produced Liquid, adds in 100ml color-comparison tubes, adds the corrosion inhibiter sample of 10ml into color-comparison tube with pipette, will be slow
Erosion agent is made into the solution that volume fraction is 10%, covers bottle stopper, shakes 5min, is uniformly mixed it, will be uniformly mixed containing slow
The color-comparison tube of erosion agent aqueous solution is put into the water-bath of constant temperature, is observed respectively and is recorded showing for 30min and 24h after constant temperature
As, be in homogeneous, the transparent judgment criterion for favorable solubility with solution during constant temperature 30min and constant temperature 24h, with constant temperature 30min and
Solution has uneven liquid pearl or particle in the homogeneous judgment criterion good for dispersed phase with solution during constant temperature 30min during constant temperature 24h
Solution layering or have a judgment criterion for being precipitated as dissolubility and bad dispersibility when distribution, constant temperature 24h, dissolubility to corrosion inhibiter and
Dispersiveness is evaluated；
Water-soluble test result is：Constant temperature after 30 minutes appearance phenomenon be：For No. 1 solution in homogeneously, No. 2 have uneven liquid pearl
Disperse with particle, No. 3 have uneven liquid pearl and particle to disperse, and for No. 4 solution in homogeneously, No. 5 have uneven liquid pearl and particle to disperse,
No. 6 solution are in homogeneously, and No. 7 solution are in homogeneous.
It can draw：No. 2, No. 3 and No. 5 corrosion inhibiter have non-uniform liquid pearl and particle to disperse after mixing with live Produced Liquid
Poorly water-soluble.
B. emulsification tendency determination experiment：The corrosion inhibitor solution of 1000mg/L is prepared with live Produced Liquid, connects water bath with thermostatic control
Power supply, is warming up to 60 DEG C, be separately added into 2 100ml color-comparison tubes the corrosion inhibiter containing 1000mg/L live Produced Liquid or
Live Produced Liquid 50ml without corrosion inhibiter, crude oil 50ml, covers bottle stopper, and color-comparison tube is put into the water-bath of constant temperature,
After constant temperature 30min, it will be placed into after the colorimetric cylinder up-down vibration 200 times for filling mixed liquor in water-bath, when record stands 10min
Oil-water interfaces delamination, observation oil phase, water mutually emulsify degree, and when recording 60min blank group oil-water ratio V1, add corrosion inhibiter
The oil-water ratio V of group2, compare plus the oil-water ratio of corrosion inhibiter and blank group experiment, oil-water interfaces are clear, stand during standing 10min
V during 60min1≥V2For judgment criterion of the corrosion inhibiter without emulsification tendency, the emulsification tendency to corrosion inhibiter is evaluated；
Emulsification tendency judges that result is：Stand 10 minutes when appearance phenomenon be：No. 1 oil-water interfaces are clear, No. 2 greases circle
Face is unintelligible, and No. 3 oil-water interfaces are unintelligible, and No. 4 oil-water interfaces are clear, and No. 5 oil-water interfaces are unintelligible, and No. 6 oil-water interfaces are clear,
No. 7 oil-water interfaces are clear；Stand 60 minutes when appearance phenomenon be：No. 1 corrosion inhibiter V1≥V2, No. 2 corrosion inhibiter V1≤V2, No. 3 slow
Lose agent V1≤V2, No. 4 corrosion inhibiter V1≥V2, No. 5 corrosion inhibiter V1≤V2, No. 6 corrosion inhibiter V1≥V2, No. 7 corrosion inhibiter V1≥V2(V1For sky
The oil-water ratio organized in vain, V2To add the oil-water ratio of the corrosion inhibiter)
It can draw：After No. 2, No. 3 and No. 5 corrosion inhibiter mix with the crude oil in live recovered water, oil-water interfaces are unintelligible
And water yield is reduced compared with blank group, therefore 3 kinds of corrosion inhibiter have emulsification to be inclined to, and are not suitable for the oil field.
C. tested and emulsification tendency determination experiment is as a result, filter out and good slow of live Produced Liquid compatibility according to water-soluble
It is No. 1, No. 4, No. 6, No. 7 to lose agent.
Step 4：Using the good corrosion inhibiter of compatibility in electrochemical corrosion detection method evaluation procedure three, inhibition is filtered out
Rate is more than 90% corrosion inhibiter, and experimental procedure is as follows：
A. solution and container prepare：1000ml scenes Produced Liquid first is being added into three neck round bottom before experiment, is being continued
It is passed through CO2Gas 2h, then adds 200ppm corrosion inhibiter uniform stirrings；
B. electrode material prepares：The working electrode of electrochemistry experiment is floor space 0.7854cm2Cylinder oil pumping pole stock
Matter, uses 200#, 400#, 600#, 800# and 1200# abrasive paper for metallograph is polishing to worksheet step by step successively before experiment by working electrode
Untill face is without obvious cut, then petroleum ether cleaning remove working electrode surface oil stain after, then with washes of absolute alcohol, wipe
It is stand-by to remove the residue of working electrode surface, carries out electrochemical evaluation using three-electrode system, the reference electrode used is full
And calomel electrode, auxiliary electrode are platinum electrode；
C. electrochemistry experiment：Electrochemical evaluation is carried out using electrochemical workstation three-electrode system, first measurement open circuit electricity
Position, parameter during measurement are arranged to scan area 0.7845cm2, impedance spectrum is then surveyed, finally measures polarization with dynamic potential scanning
Curve, the scanning range of electrokinetic potential scanning polarization curve is -600mV-1000mV, scan frequency 0.5mV/s；
D. analysis of experimental data：Every group of dynamic potential scanning curve is fitted, it is according to corrosion current density I and certainly rotten
Erosion current potential E draws out Log ∣ I ∣~E figures, the straight line portion of negative anodic polarization curve is extended, the corresponding abscissa of gained intersection point
It is worth for corrosion current density Icorr, the corrosion inhibition rate of corrosion inhibiter is calculated by formula (1)：
In formula, Icorr.0 is sucker rod material in the corrosion current density of blank Produced Liquid, unit mA/cm2,
Icorr is sucker rod material in the corrosion current density containing corrosion inhibiter Produced Liquid；
The result is shown in Fig. 2, the parameter of fitting to be for electro-chemical test polarization curve：Blank group corrosion electric current density 1.7175 ×
10-4mA/cm2, No. 1 corrosion electric current density 1.2254 × 10-5mA/cm2, No. 4 corrosion electric current densities 2.1125 × 10-5mA/cm2, 6
Number corrosion electric current density 6.442 × 10-6mA/cm2, No. 7 corrosion electric current densities 1.2152 × 10-5mA/cm2。
It can be seen that the corrosion inhibition rate of No. 6 and No. 7 corrosion inhibiter is all higher than 92% according to Fig. 2 and corrosion current density, inhibition
Effect is better than No. 1 and No. 4 corrosion inhibiter.
E. No. 6 of corrosion inhibition rate more than 90% and No. 7 corrosion inhibiter are filtered out as corrosion inhibiter alternative in next step；
Step 5：It is real that the corrosion inhibiter screened using static state high-temperature autoclave test to step 4 carries out corrosion weight loss evaluation
Test, filter out the corrosion inhibiter of corrosion rate≤0.076mm/a, experimental procedure is as follows：
The sample of sucker rod, oil pipe, three kinds of materials of casing (size is 30 × 15 × 3mm) is deoiled, removed before experiment
Water, and after being dried completely, then hangs on and adds 500ppm corrosion inhibiter and be not added with the saturation CO of corrosion inhibiter respectively2Produced Liquid
Kettle in, it is at gas-liquid interface in the solution that sample, which is completely immersed in solution as experiment in the liquid phase, the leaching of half sample,
Experiment, sample is not immersed in solution is set as the pit shaft highest temperature for experiment in the gas phase, simulation field working conditions experiment parameter
Degree, maximum CO2Partial pressure, maximum chloride ion content, corrode after a week in the case where simulating working condition, sample are taken out, by weightless sample
It is placed in film liquid and cleans, to remove the corrosion product of specimen surface, and passes sequentially through deionized water, absolute alcohol flushing, it is cold
Wind is weighed after doing, and corrosion rate is calculated by formula (2)：
In formula：V is the corrosion rate of material, unit mma-1；w0With w1The quality of test piece before and after respectively corroding, it is single
Position is g；S be test piece area, unit cm2；ρ is the density of carbon steel, its value is 7.8gcm-3, t is experimental period, unit
For h；Corrosion rate is calculated, filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, record sucker rod, oil pipe, casing material exist
The corrosion inhibiter and its numbering met the requirements in three kinds of phaseexperiments of static state high-temperature autoclave；
Static state high-temperature autoclave test is the result is shown in Fig. 3, by figure three it can be seen that No. 6, No. 7 are satisfied by requiring.
Step 6：6, No. 7 corrosion inhibiter screened using dynamic high temperature autoclave test to step 5 are carried out corrosion weight loss and commented
Valency is tested, and further filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, and experimental procedure is as follows：
The sample of sucker rod, two kinds of materials of oil pipe (size is 30 × 15 × 3mm) is deoiled, is removed water before experiment, and
After being dried completely, then the fixture equipped with sample is put into the tube runs corrosion experimental device with height difference, is tested
When solution be sufficiently mixed grease from being circulated from up to down with certain flow velocity, simulation field working conditions experiment parameter is set as
Live pit shaft maximum temperature, maximum CO2Partial pressure, maximum chlorine ion concentration, corrode after a week in the case where simulating working condition, take out examination
Sample, weightless sample is placed in film liquid and is cleaned, and to remove the corrosion product of specimen surface, and passes sequentially through deionized water, nothing
Water-alcohol rinses, and finally calculates corrosion rate with formula 1-2, filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, determines to meet
It is required that corrosion inhibiter and its numbering.
The result is shown in Fig. 4, as seen from Figure 4 No. 6 corrosion inhibiter to meet the requirements for dynamic high temperature autoclave test.
Claims (1)
- A kind of 1. flow quickly screened suitable for carbon dioxide drive oil production well corrosion inhibiter, it is characterised in that：First to intending using Corrosion inhibiter carry out Compatibility Evaluation, corrosion inhibition rate is further then filtered out more than 90% using electrochemical corrosion detection method Corrosion inhibiter, finally simulates the static inhibition for going out to meet oil field corrosion control index with Dynamic Corrosion operating mode Integrated Selection of producing well Agent, specifically includes following steps：(1) the corrosive conditions parameter of oil well is collected, is specifically included：Chloride ion content, CO2Partial pressure, temperature in wellbore, flow velocity, Pit shaft Phase velocity map and oil-water ratio；(2) according to oil field corrosive conditions parameter, the corrosion inhibiter species for meeting corrosive conditions is collected, and it is numbered；(3) Compatibility Evaluation is carried out to the corrosion inhibiter of collection, specific experiment step is as follows：A. water-soluble experiment：Thermostat water bath power supply is first connected during experiment, is warming up to 60 DEG C, the extraction of 90ml scenes is measured with graduated cylinder Liquid, adds in 100ml color-comparison tubes, the corrosion inhibiter sample of 10ml is added into color-comparison tube with pipette, by corrosion inhibiter The solution that volume fraction is 10% is made into, covers bottle stopper, shakes 5min, is uniformly mixed it, contains corrosion inhibiter by being uniformly mixed The color-comparison tube of aqueous solution is put into the water-bath of constant temperature；Observe respectively and record the phenomenon of 30min and 24h after constant temperature, It is in homogeneous, the transparent judgment criterion for favorable solubility with solution during constant temperature 30min and constant temperature 24h, with constant temperature 30min and constant temperature Solution has uneven liquid pearl or particle point in the homogeneous judgment criterion good for dispersed phase with solution during constant temperature 30min during 24h Solution is layered or has a judgment criterion for being precipitated as dissolubility and bad dispersibility when cloth, constant temperature 24h, dissolubility to corrosion inhibiter and point Scattered property is evaluated；B. emulsification tendency determination experiment：The corrosion inhibitor solution of 1000mg/L is prepared with live Produced Liquid, connects water bath with thermostatic control power supply, 60 DEG C are warming up to, the live Produced Liquid of the corrosion inhibiter containing 1000mg/L is separately added into 2 100ml color-comparison tubes or without slow The live Produced Liquid 50ml of agent is lost, crude oil 50ml, covers bottle stopper, color-comparison tube is put into the water-bath of constant temperature, constant temperature After 30min, it will be placed into after the colorimetric cylinder up-down vibration 200 times for filling mixed liquor in water-bath；Record stands grease during 10min Interface debonding situation, observation oil phase, water mutually emulsify degree, and when recording 60min blank group oil-water ratio V1, add corrosion inhibiter group Oil-water ratio V2, compare plus the oil-water ratio of corrosion inhibiter and blank group experiment, oil-water interfaces are clear, stand 60min during standing 10min When V1≥V2For judgment criterion of the corrosion inhibiter without emulsification tendency, the emulsification tendency to corrosion inhibiter is evaluated；C. according to water-soluble experiment and emulsification tendency determination experiment as a result, filtering out the inhibition good with live Produced Liquid compatibility Agent, and record corresponding numbering；(4) corrosion inhibiter that compatibility is good in electrochemical corrosion detection method evaluation procedure (3) is used, corrosion inhibition rate is filtered out and is more than 90% corrosion inhibiter, experimental procedure are as follows：A. solution and container prepare：1000ml scenes Produced Liquid first is being added into three neck round bottom before experiment, is being continually fed into CO2Gas 2h, then adds 200ppm corrosion inhibiter uniform stirrings；B. electrode material prepares：The working electrode of electrochemistry experiment is floor space 0.7854cm2Cylindrical sucker rod material, it is real Working electrode is used into 200#, 400#, 600# successively before testing, 800# and 1200# abrasive paper for metallograph be polishing to step by step working surface without Untill obvious cut, after then petroleum ether cleaning removes the oil stain of working electrode surface, then with washes of absolute alcohol, wipe and remove The residue of working electrode surface is stand-by；Electrochemical evaluation is carried out using three-electrode system, the reference electrode used is sweet for saturation Mercury electrode, auxiliary electrode are platinum electrode；C. electrochemistry experiment：Electrochemical evaluation is carried out using electrochemical workstation three-electrode system, measures open circuit potential first, is surveyed Parameter during amount is arranged to scan area 0.7845cm2, time of measuring 30 minutes, then surveys impedance spectrum, is finally swept with electrokinetic potential Retouch and measure polarization curve, the scanning range of electrokinetic potential scanning polarization curve is -600mV-1000mV, scan frequency 0.5mV/s；D. analysis of experimental data：Every group of dynamic potential scanning curve is fitted, according to corrosion current density I and self-corrosion electricity Position E draws out Log ∣ I ∣~E figures, and the straight line portion of negative anodic polarization curve is extended, and the corresponding abscissa value of gained intersection point is Corrosion current density Icorr, the corrosion inhibition rate of corrosion inhibiter is calculated by formula (1)：<mrow> <mi>I</mi> <mi>E</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>I</mi> <mrow> <mi>c</mi> <mi>o</mi> <mi>r</mi> <mi>r</mi> <mn>.0</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>I</mi> <mrow> <mi>c</mi> <mi>o</mi> <mi>r</mi> <mi>r</mi> </mrow> </msub> </mrow> <msub> <mi>I</mi> <mrow> <mi>c</mi> <mi>o</mi> <mi>r</mi> <mi>r</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <mn>100</mn> <mi>%</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>In formula：Icorr.0It is sucker rod material in the corrosion current density of blank Produced Liquid, unit mA/cm2；IcorrFor oil pumping Pole stock matter is in the corrosion current density containing corrosion inhibiter Produced Liquid；E. corrosion inhibiter of the corrosion inhibition rate more than 90% is filtered out as corrosion inhibiter alternative in next step, and records corresponding numbering；(5) corrosion inhibiter screened using static state high-temperature autoclave test to step (4) carries out corrosion weight loss evaluation experimental, filters out The corrosion inhibiter of corrosion rate≤0.076mm/a, experimental procedure are as follows：A. three kinds of sucker rod, oil pipe, casing material sizes deoiled for the sample of 30 × 15 × 3mm before experiment, removed water, and After being dried completely, the saturation CO for adding 500ppm corrosion inhibiter and being not added with corrosion inhibiter is then hung on respectively2The kettle of Produced Liquid In, it is in the solution the reality at gas-liquid interface that sample, which is completely immersed in solution as experiment in the liquid phase, the leaching of half sample, Test, sample is not immersed in solution for experiment in the gas phase；B. simulation field working conditions experiment parameter is set as pit shaft maximum temperature, maximum CO2Partial pressure, maximum chloride ion content, are being simulated Corrode under working condition after a week, take out sample, weightless sample is placed in film liquid and is cleaned, to remove the corrosion of specimen surface Product, and deionized water, absolute alcohol flushing are passed sequentially through, weigh after cold wind drying, corrosion rate is calculated by formula (2)：<mrow> <mi>v</mi> <mo>=</mo> <mfrac> <mrow> <mn>87600</mn> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>w</mi> <mn>0</mn> </msub> <mo>-</mo> <msub> <mi>w</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <mi>S</mi> <mi>t</mi> <mi>p</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>In formula：V is the corrosion rate of material, unit mma-1；w0With w1The quality of test piece, unit are before and after respectively corroding g；S be test piece area, unit cm2；ρ is the density of carbon steel, its value is 7.8gcm-3, t is experimental period, unit h；C. corrosion rate is calculated, filters out the corrosion inhibiter of corrosion rate≤0.076mm/a, record sucker rod, oil pipe, casing material The corrosion inhibiter and its numbering met the requirements in three kinds of phaseexperiments of static state high-temperature autoclave；(6) corrosion inhibiter screened using dynamic high temperature autoclave test to step (5) carries out corrosion weight loss evaluation experimental, further The corrosion inhibiter of corrosion rate≤0.076mm/a is filtered out, experimental procedure is as follows：A. sucker rod, the sample that two kinds of material sizes of oil pipe are 30 × 15 × 3mm are deoiled, are removed water before experiment, and by its After drying completely, then the fixture equipped with sample is put into the tube runs corrosion experimental device with height difference；Solution is sufficiently mixed grease from being circulated from up to down with certain flow velocity when b. testing, simulation field working conditions experiment Parameter setting is live pit shaft maximum temperature, maximum CO2Partial pressure, maximum chlorine ion concentration, corrode one in the case where simulating working condition Week；C. sample is taken out, weightless sample is placed in film liquid and is cleaned, to remove the corrosion product of specimen surface, and is passed sequentially through Deionized water, absolute alcohol rinse, and finally calculate corrosion rate with formula (2), filter out the inhibition of corrosion rate≤0.076mm/a Agent, determines corrosion inhibiter and its numbering met the requirements.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424016A (en) * | 2019-08-26 | 2019-11-08 | 中国特种设备检测研究院 | A kind of compound corrosion inhibitor preparation method suitable for producing synthesis gas from coal |
| CN111177947A (en) * | 2020-01-12 | 2020-05-19 | 西南石油大学 | Multi-factor considered CO2Corrosion prediction plate establishing method |
| CN111208056A (en) * | 2020-01-13 | 2020-05-29 | 中海油常州涂料化工研究院有限公司 | Corrosion inhibition performance evaluation method of vapor phase corrosion inhibitor |
| CN111504846A (en) * | 2020-06-17 | 2020-08-07 | 西南石油大学 | Indoor rapid evaluation method for corrosion inhibitor of crude oil production and transportation pipe |
| CN111624153A (en) * | 2020-07-09 | 2020-09-04 | 西南石油大学 | Mountain region moisture pipeline gas-liquid two-phase flow corrosion test device |
| CN113063830A (en) * | 2020-01-02 | 2021-07-02 | 中国石油化工股份有限公司 | Rapid screening method of corrosion inhibitor under high-salinity water condition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644913A (en) * | 2017-01-12 | 2017-05-10 | 中国石油化工股份有限公司 | Evaluation method of corrosion inhibitor of crude oil gathering and transporting system |
| CN106841026A (en) * | 2016-12-27 | 2017-06-13 | 中国石油天然气股份有限公司 | A kind of method for evaluating corrosion inhibiter inhibition efficiency |
-
2017
- 2017-12-05 CN CN201711265991.6A patent/CN108008076A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841026A (en) * | 2016-12-27 | 2017-06-13 | 中国石油天然气股份有限公司 | A kind of method for evaluating corrosion inhibiter inhibition efficiency |
| CN106644913A (en) * | 2017-01-12 | 2017-05-10 | 中国石油化工股份有限公司 | Evaluation method of corrosion inhibitor of crude oil gathering and transporting system |
Non-Patent Citations (9)
| Title |
|---|
| B.WANG,ET AL.: ""Electrochemical and surface analysis studies on corrosion inhibition of Q235 steel by imidazoline derivative against CO2 corrosion"", 《CORROSION SCIENCE》 * |
| HONGWEI LIU, ET AL.: ""Corrosion inhibition of carbon steel in CO2-containing oilfield produced water in the presence of iron-oxidizing bacteria and inhibitors"", 《CORROSION SCIENCE》 * |
| S.NESIC: ""Effects of Multiphase Flow on Internal CO2 Corrosion of Mild Steel Pipelines-Energy Fuels"", 《ENERGY FUELS》 * |
| T.HONG, ET AL: ""Corrosion inhibitor studies in large flow loop at high temperature and high pressure"", 《CORROSION SCIENCE》 * |
| 明卫平: ""二氧化碳高效缓蚀剂的筛选及缓释性能研究"", 《中国优秀硕士学位论文全文数据库-工程科技Ⅰ辑》 * |
| 王春放: ""动态模拟装置上流体对Q235碳钢腐蚀性行为研究"", 《中国优秀硕士论文全文数据库（电子期刊）-工程科技Ⅰ辑》 * |
| 陈国浩: ""二氧化碳腐蚀体系缓蚀剂的缓蚀机理及缓蚀协同效应研究"", 《中国优秀硕士论文全文数据库-工程科技Ⅰ辑》 * |
| 韩晓兰 等: ""油田注水缓蚀剂的合成及性能评价"", 《石油化工腐蚀与防护》 * |
| 黎政权: ""吉林油田含CO2气井腐蚀与防护技术研究"", 《中国优秀硕士论文全文数据库-工程科技Ⅰ辑》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424016A (en) * | 2019-08-26 | 2019-11-08 | 中国特种设备检测研究院 | A kind of compound corrosion inhibitor preparation method suitable for producing synthesis gas from coal |
| CN113063830A (en) * | 2020-01-02 | 2021-07-02 | 中国石油化工股份有限公司 | Rapid screening method of corrosion inhibitor under high-salinity water condition |
| 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 |
| CN111208056A (en) * | 2020-01-13 | 2020-05-29 | 中海油常州涂料化工研究院有限公司 | Corrosion inhibition performance evaluation method of vapor phase corrosion inhibitor |
| CN111504846A (en) * | 2020-06-17 | 2020-08-07 | 西南石油大学 | Indoor rapid evaluation method for corrosion inhibitor of crude oil production and transportation pipe |
| CN111624153A (en) * | 2020-07-09 | 2020-09-04 | 西南石油大学 | Mountain region moisture pipeline gas-liquid two-phase flow corrosion test device |
| CN111624153B (en) * | 2020-07-09 | 2020-12-15 | 西南石油大学 | Mountain region moisture pipeline gas-liquid two-phase flow corrosion test device |
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