CN204807432U - Profit is moist analogue means that corrodes in turn - Google Patents
Profit is moist analogue means that corrodes in turn Download PDFInfo
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- CN204807432U CN204807432U CN201520432871.0U CN201520432871U CN204807432U CN 204807432 U CN204807432 U CN 204807432U CN 201520432871 U CN201520432871 U CN 201520432871U CN 204807432 U CN204807432 U CN 204807432U
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Abstract
The utility model discloses a profit is moist analogue means that corrodes in turn, the device includes: electrochemistry signal processing system, the alternative moist simulation electrolytic bath of profit, rotating disk electrode system, oil -water interface control system, aeration systems and the temperature control system who is used for damping in turn the heating of simulation electrolytic bath to the profit. The utility model provides a device can realize that the in turn moist environment medium carbon steel of profit corrodes signal quick response, graspes the leading features of profit two -phase flow environment, can revea more comprehensively, profound and corrode the law.
Description
Technical field
The utility model oil-gas pipeline corrosion risk assessment field, is specifically related to a kind of profit alternately wetting corrosion simulated device.
Background technology
The evaluation of pipe-line corrosion risk to ensure safety in production and stable operation most important.For disclosing its corrosion regularity, realizing corrosion life prediction, this field has established multiple research method to simulate or has reappeared the on-the-spot corrosive conditions environment of oil and gas pipes.According to the function difference that all kinds of device realizes, be mainly summarized as follows:
(1) common three-electrode electro Chemical test macro: this experimental technique mainly lays particular emphasis on the impact of various ion pair carbon steel piping corrosion in research aqueous solution, such as Cl
-, CO
2and H
2s isoconcentration or dividing potential drop, by the feature that Electrochemical Measurement Technology responds fast, can study the dynamic process of corrosion of carbon steel, is the important means disclosing microcosmic corrosion mechanism.The method General Requirements solution medium has higher conductivity, and therefore containing in crude oil medium, its test data obtained has certain discreteness.The method is widely used in the corrosion behavior of material in simulation oil field recovered water solution medium, and is difficult to simulate actual profit pumped (conveying) medium characteristic and corrosion regularity.
(2) high temperature and high pressure kettle experimental system for simulating: this experimental system provides closed environment for oil field mining liquid corrosive medium, for the corrosion of carbon steel behavior under research high pressure and hot conditions, there is clear superiority, but for simulating oil-water two-phase medium corrosion test, there is very large limitation in the method.Research shows, utilizes high temperature and high pressure kettle can study Water in Oil emulsion corrosion regularity, but its prerequisite is the homogenising easily realizing medium in still at very high rotation speeds.In addition, Nesic etc. adopt the horizontal kettle of particular design, and rotary sample can be made to realize water-oil phase alternately wetting corrosion simulated, the scope of application of autoclave body in corrosion research has been expanded in these trials.The evaluation of the general acquisition of the method by corrosion coupon weightlessness corrosion rate, also has research to introduce in autoclave body simulation test by technology such as high-temperature and pressure electro-chemical measurement method and corrosion probes simultaneously, reflects the corrosive nature of material in special extreme environment comprehensively.
(3) small-sized loop-type profit dispersion medium corrosion test system: for understanding the corrosion regularity of water-oil phase Mild Steel, NACE suggested a kind of erosion analysis method of emulsion fluid or profit disperse phase.The method is dependent on a set of small loop device, comprises several parts such as stirred tank, pump and test pipeline.The method can by changing the phase inversion point of the water percentage determination emulsion fluid of blending agent; Simultaneously can by test probe determination tube wall local wetting characteristics etc., such as can differentiate glossy wet, water-wet and profit alternately three kinds of situations such as wetting, but detailed description profit being replaced to wetting behavior can not be realized.In this cyclic system, the test of corrosion rate generally needs the corrosion-monitoring probe technology by means of maturation.
(4) the corrosion simulated system of large-scale loop-type multi-phase flow: some well-known research institutions and oil company have all built the corrosion simulated experimental ring duct device of larger hydrocarbon water multiphase, its fundamental purpose makes direct evaluation to on-the-spot production of hydrocarbons environmental corrosion rule, is commonly referred to " internal corrosion directly evaluation technology ".The feature of such device is flow pattern at utmost in analogue simulation field pipes and profit wetting regime, monitors ad-hoc location corrosion rate simultaneously.According to domestic and international report, large-scale experiment loop can pass through corrosion probe, corrosion coupon, Fe
2+the change of corrosion rate in the multiple technologies monitoring flow process such as ion detection, can also the water percentage of control flow check body medium, the gas-liquid when kinds of processes parameter such as flow velocity, the measurement of the fluid parameters such as wetting type, liquid flow pattern, pressure reduction, nearly wall shearing stress can be obtained by subtest means simultaneously.At present, the significance of this kind of technology to research oil-gas gathering and transferring pipeline etching problem has obtained educational circles and has highly admitted.Coincide with the higher degree of on-site actual situations for reaching, test loop is larger, pipe diameter be 2 inches to 4 inches not etc., flow development length generally needs more than 200 times that reach pipe diameter, thus occupies larger lab space.Crude oil required for single test, solution medium, CO
2the large usage quantities such as gas, power consumption and manpower requirement more.In addition, also need to consider the problems such as liquid waste processing in experimentation.
(5) oilfield transportation system corrosion inhibiter evaluation method: the effect of a kind of corrosion inhibiter of experiment inside authentication is often dependent on two kinds of method of testings, i.e. electrochemical method and corrosion coupon weight-loss method.In general, electrochemical method test corrosion inhibiter corrosion mitigating effect is in aqueous succinctly quick; Corrosion weight loss rule can simulate the action effect of corrosion inhibiter in High Temperature High Pressure or simulated field environment.But often there is the situation larger with laboratory testing differentia in the rig-site utilization of corrosion inhibiter.Wherein, oil-gas gathering and transportation system or sewerage are all containing a certain amount of crude oil, and this will cause the obvious change of corrosion inhibiter effect, long-standing problem the evaluation of testing indoor corrosion mitigating effect.Certainly, by building large-scale Multiphase Flow analogue loop device, the docking of corrosion inhibiter from laboratory to scene can be realized and rule is groped, but in laboratory, corrosion inhibiter evaluation still lacks a kind of simple and easy, appraisal procedure fast.
From existing experiment research, the corrosive pipeline simulation for Oil Field water-oil phase blending transportation still haves much room for improvement.Wherein, most distinct issues profit cannot be accomplished to replace wetting behavior quantitatively characterizing, and corresponding in real time with corrosion monitoring signal.And these information or relevance predict to have decisive meaning for the corrosion regularity of complete understanding pipe-line and corrosion risk.Therefore, current technology mainly has the following disadvantages:
(1) traditional three-electrode electro Chemical system needs solution medium to have high electrical conductivity, is therefore difficult to test in oil containing medium, limits the understanding of microcosmic corrosion mechanism;
(2) corrosion weight loss method of testing alternately soaks at profit or controls environment residing for test piece in profit dispersion medium, and can only obtain final corrosion data or pattern, lacks profit and contacts the wetting environmental parameter waiting necessity with test piece;
(3) corrosion simulated loop device can realize water-oil phase flow pattern or wetting property and corrosion concerns and studies, but it is too macroscopical to the identification of water-oil phase wetting regime, particularly wetting regime is replaced for profit to be difficult to realize quantitative examination, be also difficult to replace with inner-walls of duct wetting regime by the collection of the technology such as corrosion probe to corrosion signal and formed and contrast;
(4) the operation and maintenance difficulty of the corrosion simulated device of larger hydrocarbon water multiphase is large, and labor intensive material resources are huge, also becomes one of reason of restriction water-oil phase or the quantitative examination of oil-gas-water three-phase flow corrosion regularity.
Oil Field For Evaluation of Effectiveness of Inhibitors is needed development one badly and is applicable to respond fast and corrosion rate assessment technique containing corroding signal in crude oil medium.
Utility model content
The technical problems to be solved in the utility model is: oil field mining liquid inner-walls of duct is often in profit and replaces wetting regime, and this is also the one of the main reasons causing pipeline different parts unsymmetrical corrosion to be bored a hole.But, still lack the understanding to its corrosion regularity at present.Major Difficulties is (1), and profit replaces the simulation of wetting regime; (2) containing the acquisition of corrosion signal instantaneous in crude oil environment.For research profit replaces wet processes, generally wetting behavior and corrosion behavior are studied respectively, lack the understanding of correspondence and correlativity, hinder the clarification of corrosion mechanism.
The utility model relates in production of hydrocarbons process and corrodes analog simulation test device, is mainly quantitatively characterizing inner-walls of duct under profit alternately action condition, the quick response of corrosion signal and record, thus a kind of corrosion evaluation method under providing crude oil wetting conditions.This device using as the infrastest device disclosing crude oil corrosion inhibition and corrosion regularity, simultaneously for For Evaluation of Effectiveness of Inhibitors in crude oil gathering pipeline provide reliably, method easily.
The profit that the utility model provides is wetting corrosion simulated device alternately, comprising:
Electrochemical signals disposal system, it is one can the electrochemical workstation of record current signal, and this electrochemical workstation has working electrode terminal, contrast electrode terminal and to electrode terminal;
Profit is wetting simulation electrolytic cell alternately, and comprise electrolytic cell urceolus and be sheathed on electrolytic cell inner core in electrolytic cell urceolus, electrolytic cell inner core is communicated with electrolytic cell urceolus; The platinum that is electrically connected with to electrode terminal is provided with to electrode and the contrast electrode that is electrically connected with contrast electrode terminal in electrolytic cell inner core;
Rotating disk electrode (r.d.e) system, comprises the rotating driving device of disk electrode and driver plate electrode rotary, and disk electrode stretches in electrolytic cell inner core; Platinum is positioned at the below of disk electrode to electrode, and this platinum is parallel with the bottom surface of disk electrode to electrode; The tip of the salt bridge point pipe of contrast electrode is positioned over platinum between electrode and the bottom surface of disk electrode; Wherein, the bottom surface of described disk electrode be conducting surface as working electrode, the remainder insulation of disk electrode outside surface, working electrode is electrically connected with working electrode terminal; Or the side of described disk electrode establishes a ring shaped conductive face as working electrode, the remainder insulation of disk electrode outside surface, working electrode is electrically connected with working electrode terminal;
Oil-water interface control system, comprising: float and for controlling the perpendicular displacement control device that float moves up and down, and wherein, float extend between electrolytic cell urceolus and electrolytic cell inner core;
Aerating system, comprises the aeration head be arranged in electrolytic cell urceolus, outside electrolytic cell inner core and the gas supply device be communicated with described aeration head by vent line;
For alternately soaking the temperature control system of simulation electrolytic cell heating to profit.
As optimal technical scheme, described perpendicular displacement control device, comprise: fixed mount, step-by-step motor, motor control unit and accurate thread guide rod, be fixed on fixed mount after step-by-step motor is connected with motor control unit, step-by-step motor is connected with float by accurate thread guide rod.
As optimal technical scheme, described temperature control system comprises the heat tape being wound in the outer drum outer wall of electrolytic cell and the temperature control unit be electrically connected with described heat tape.
As optimal technical scheme, the upper bottom surface of electrolytic cell inner core envelope is provided with the external end face of corrosion cell, the external end face of this corrosion cell be provided with crude oil inject with recovery holes, rotating disk electrode (r.d.e) jack, reference electrode reference electrode plug, to Electrode connection hole and spiracle; The wire be connected with to electrode terminal through described to Electrode connection hole and platinum to Electrode connection; Contrast electrode is fastened in reference electrode reference electrode plug; Disk electrode is connected and fixed on described rotating driving device, and is inserted in electrolytic cell inner core by described rotating disk electrode (r.d.e) jack.
Preferably, the cross-sectional area of described electrolytic cell urceolus is more than 2 times of float drainage area.
As optimal technical scheme, described disk electrode is made up of wire, insulation crust and the conductive core that is connected with this wire, and this wire is electrically connected with described working electrode terminal;
Wherein, the bottom surface of this insulation crust is provided with opening, and this opening shape is identical with the bottom surface of conductive core, and the bottom surface of conductive core is fastened on this opening part as working electrode; Or this insulation crust is made up of upper and lower two parts, this upper and lower two-part xsect is identical with conductive core, and conductive core is clipped in the middle by these upper and lower two parts, thus forms ring shaped conductive face in the side of insulation crust as working electrode.
As optimal technical scheme, described electrolytic cell inner core is provided with liquid level scale device.
As optimal technical scheme, described platinum is less than 2cm to the distance between electrode and working electrode.
The utility model provide the above-mentioned profit of application alternately wetting corrosion simulated device carry out the alternately wetting corrosion simulated method of profit, comprise the steps:
(1) Preparatory work of experiment: obtained aqueous solution, being filled in described profit alternately soaks in simulation electrolytic cell, level control (LC) is above the salt bridge point pipe of contrast electrode, the below of working electrode, to be ventilated deoxygenation by aerating system, start-up temperature control system, be warming up to setting value, control perpendicular displacement control device float to be pressed in water so that working electrode is adjusted to below the water surface, more than the salt bridge point pipe of contrast electrode, connect working electrode terminal and working electrode, contrast electrode terminal and contrast electrode and to electrode, temperature-controlling system is started to electrode terminal and platinum, be warming up to setting value,
(2) crude oil is heated to probe temperature and deoxygenation of ventilating in advance, is injected inject electrolytic cell inner core with recovery holes by crude oil;
(3) start the rotating driving device of rotating disk electrode (r.d.e) system, and make disk electrode smooth rotation under specific rotation speeds; Open electrochemical workstation, test open circuit potential makes it reach stable;
(4) Potentiostatic corrosion test is carried out: when testing initial, working electrode is in aqueous phase, after reaching experiment setting-up time, start oil-water interface control system, by the water-oil interface reciprocation period of the speed of perpendicular displacement control device setting float lower movement in vertical direction, distance and working electrode, water-oil interface start periodically to pump, and enter the profit alternately wetting corrosion test stage, record current--time changing curve;
(5) data analysis: working electrode surface erosion profile carries out microexamination; Electric current--time response, curve carried out statistical study, t
0to t
1the average corrosion current density in moment is calculated as follows:
dt
Wherein,
for average current density, the electric current that I (t) obtains for experiment test--time response function, t
0for the selected profit alternately wetting home record time, t
1for the etching time of required calculating average current density.
At present, studying state-of-the-art technological means for oil-gas pipeline corrosion is in the world the corrosion simulated device of larger hydrocarbon water multiphase, can analogue simulation pipeline field actual fed situation by the type device, reflect the moving law that crude oil corrodes inner-walls of duct simultaneously.Compared with such technology, device and method provided by the utility model has the following advantages:
1, realize profit to replace wet environment medium carbon steel corrosion signal and respond fast, catch the principal character of oil-water two-phase flow environment, can more comprehensively, profound disclose corrosion regularity;
2, corrosion evaluation is quick and pointed, particularly has clear superiority for For Evaluation of Effectiveness of Inhibitors in water-oil phase environment;
3, device is simple and easy, small and exquisite, cost is low, easy to operate, and experiment fluid volume is little, and compared with large-scale Multiphase Flow loop, experiment operating cost is very low;
4, experimental temperature, wetting frequency, state modulator such as simulation flow velocity, base oil properties etc. are simply and accurately.
Accompanying drawing explanation
Fig. 1 is water of the present utility model alternately wetting corrosion simulated apparatus structure schematic diagram.
Fig. 2 is profit of the present utility model alternately wetting simulation electrolytic cell cross-sectional view.
Fig. 3 is profit of the present utility model alternately wetting simulation electrolytic cell plan structure schematic diagram.
Fig. 4 is disk electrode configuration schematic diagram one of the present utility model.
Fig. 5 is disk electrode configuration schematic diagram two of the present utility model.
Fig. 6 is that disk electrode turns and reads 1200 revs/min, under the condition of water-oil interface reciprocation period 2.15s, and corrosion current signal change curve in time.
Fig. 7 is that disk electrode turns and reads 600 revs/min, under the condition of water-oil interface reciprocation period 5.0s, and corrosion current signal change curve in time.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, and to make those skilled in the art better can understand the utility model being implemented, but illustrated embodiment is not as to restriction of the present utility model.
Profit of the present utility model alternately wetting corrosion simulated device comprises electrochemical signals disposal system; Rotating disk electrode (r.d.e) system; Profit is wetting simulation electrolytic cell alternately; Oil-water interface control system; Temperature control system and aerating system.Specifically, as shown in Figure 1:
Electrochemical signals disposal system mainly completes externally-applied potential and controls and the record of corrosion current signal and analyzing and processing, can the electrochemical workstation 1 of record current signal realize with software kit primarily of one.Three electrode terminals of electrochemical workstation 1 (working electrode terminal, contrast electrode terminal with to electrode terminal) are connected with to electrode 19 with working electrode 60, contrast electrode 18 respectively.
Composition graphs 1 ~ 3, profit is wetting simulation electrolytic cell 10 alternately, comprises electrolytic cell urceolus 27 and is sheathed on electrolytic cell inner core 28 in electrolytic cell urceolus 27.Electrolytic cell inner core 28 is without bottom surface, thus electrolytic cell inner core 28 is communicated with electrolytic cell urceolus 27; The upper bottom surface envelope of electrolytic cell inner core 28 is provided with the external end face 5 of corrosion cell, and the external end face 5 of this corrosion cell is provided with spiracle 25, crude oil injects and recovery holes 23, rotating disk electrode (r.d.e) jack 26, reference electrode reference electrode plug 22 and to Electrode connection hole 24; The wire be connected with to electrode terminal is connected electrode 19 with platinum Electrode connection hole 24 through platinum, and platinum is arranged in the below of electrolytic cell inner core 28, disk electrode 6 to electrode 19, and this platinum is parallel with the bottom surface of disk electrode 6 to electrode 19, and distance is less than 2cm and is advisable; Contrast electrode 18 is fastened in reference electrode reference electrode plug 22, and wherein the tip 180 of the salt bridge point pipe of contrast electrode 18 is positioned over platinum between electrode 19 and the bottom surface of disk electrode 9, and contrast electrode terminal is electrically connected with contrast electrode 18.Arranging that crude oil injects with recovery holes 23 object is avoid crude oil and working electrode (the sharp pipe 180 of salt bridge of contrast electrode 18, disk electrode 6 with platinum to electrode 19) to contact testing the starting stage; Arranging spiracle 25 fundamental purpose is make the electrolytic cell inner core 28 of the mutual UNICOM in bottom coordinate to change with the liquid level of electrolytic cell urceolus 27; 27-electrolytic cell outer barrel diameter size should design enough large to guarantee liquid level stabilizing, generally needs urceolus area of section to be more than 2 times of float 9 drainage area.Liquid level scale 20 can be provided with, to measure and to control liquid level in electrolytic cell inner core 28.
Rotating disk electrode (r.d.e) system realizes the simulation of rate of flow of fluid.It comprises the rotating driving device 2 of disk electrode 6 and driver plate electrode rotary, and disk electrode 6 is connected and fixed on rotating driving device 2, and is stretched in electrolytic cell inner core 28 by rotating disk electrode (r.d.e) jack 26.Rely on the rotational speed regulation of disk electrode 6 to realize different in flow rate simulation, can linear velocity be obtained according to rotating speed and electrode radius.Particularly, disk electrode 6 can be made up of wire 29, columniform insulation crust 30 and the conductive core 31 be connected with this wire, this wire 29 is connected with working electrode terminal, and (this insulation crust can be any isolation material and forms, as plastics etc., also can be conductive core 31 surface coating insullac and form).Wherein, disk electrode 6 can be designed to kind of the structure of two shown in Figure 4 and 5, thus realizes bottom surface test and side test.Bottom surface test electrode can realize water-oil interface instantaneous transition, and the operation wetting to profit of different linear velocity radius can be investigated simultaneously, the bottom surface of the insulation crust 30 of the disk electrode 6 of bottom surface test is provided with opening, this opening shape is identical with the bottom surface of conductive core 31, the bottom surface of conductive core 31 is fastened on this opening part as working electrode 60, and all the other outside surfaces insulate.Side test electrode water-oil interface non-momentary transition, but single linear velocity can be obtained, the disk electrode 6 of side test is designed to ring-type working electrode, as follows as an embodiment: this insulation crust 30 is made up of upper and lower two parts, this upper and lower two-part xsect is identical with conductive core, conductive core is clipped in the middle by these upper and lower two parts, thus forms ring shaped conductive face in the side of insulation crust as working electrode 60.Can carry out selecting or designing according to different object in specific experiment research.Rotating driving device 2 is fixed on fixed mount 4, and the vertical rack of fixed mount 4 is carbon steel material, and horizontal bracket portion is divided into carbon steel material, can vertical rack do horizontal direction rotate and vertical direction move, need fixing and locking after determining position.
Oil-water interface control system, comprise: fixed mount 14, step-by-step motor 8, motor control unit 13, accurate thread guide rod 7 and float 9, step-by-step motor 8 is connected with motor control unit 13 and is fixed on fixed mount 14, step-by-step motor 8 is connected with float 9 by accurate thread guide rod 7, and float 9 extend between electrolytic cell urceolus 27 and electrolytic cell inner core 28.Wherein, accurate thread guide rod 8, by coordinating with the rotor part of step-by-step motor 8, realizes the translation that electric machine rotation becomes guide rod, and then drives float to pump 9, thus realizes the control to water-oil interface.Screw thread density and motor velocity of rotation determine translational velocity and the precision of guide rod.Motor control unit 13 mainly comprises stepper motor driver, stepper motor Switching Power Supply box stepper motor impulse controller three part.When non-overload, the rotating speed of motor, the position of stopping only depending on frequency and the umber of pulse of pulse signal, and not by the impact of load change, when step actuator receives a pulse signal, it rotates a fixing angle with regard to Driving Stepping Motor by the direction of setting, be called " step angle ", its rotation runs step by step with fixing angle.Pilot angle displacement can be carried out by gating pulse number, thus reach the object of accurately location; Speed and the acceleration of electric machine rotation can be controlled simultaneously by gating pulse frequency, thus reach the object of speed governing.Wherein, fixed mount 14 is plain carbon steel making, and horizontal stand also can be done relevant position and direction and regulate, and for guaranteeing load-bearing, bottom needs to fix.
Aerating system, aerating system comprises the aeration head 12 be arranged in electrolytic cell urceolus 27, outside electrolytic cell inner core 28 and the gas supply device 15 be communicated with aeration head 12 by vent line 11.Aeration head 12 is positioned over the outside fundamental purpose of electrolytic cell inner core 28 for avoiding effusion aeration inner core water-oil interface stability.The solution that aerating system is mainly in electrolytic cell passes into designated gas; Generally need to pass into N in the Preparatory work of experiment stage
2deoxygenation, passes into CO depending on requirement of experiment in test process
2deng corrosive gas simulated field operating mode; Pipeline need arrange gas flow and control and metering outfit.
Temperature control system, forms primarily of heat tape 3 and temperature control unit 16.Wherein, heat tape 3 is flexible material making, and can be wound around at electrolytic cell urceolus 27 outer wall, the highest intensification can reach 100 DEG C.Temperature control unit 16 mainly comprises the parts such as thermopair, power switch, temperature regulator; Auto-breaking is realized when thermocouple induction temperature reaches setting value; Because model difference chosen by temperature regulator, test last as need through temperature correction.
For profit alternately wetting corrosion simulated experiment, analogy method profit of the present utility model alternately being soaked to corrosion simulated device is summarized:
(1) Preparatory work of experiment: obtained aqueous solution (is dependent on experimental design, in principle can any aqueous medium, be generally oil field simulation recovered water, adopt simulation oil field operating mode Produced Liquid in present embodiment, concrete solutes content is: 0.1mol/LNaCl+0.01mol/LNaHCO
3+ 0.01mol/LCaCl
2), splendid attire replaces in wetting electrolytic pond in profit, level control (LC) (above salt bridge point pipe, the below of working electrode) between mark limit line, and deoxygenation of ventilating, start-up temperature control system (generally, water-oil interface are the upper and lower equidistant concussion of initial point with working electrode 60, so the highest limit of water-oil interface is equal to the distance at contrast electrode salt bridge point pipe place with working electrode), be warming up to setting value; Float 9 is pressed in water and the test end face (working electrode 60) of disk electrode 6 is adjusted to below the water surface by control step formula motor 8, connect the contrast electrode terminal of electrochemical workstation and contrast electrode 18, to electrode terminal and platinum to electrode 19, contrast electrode 18 and working electrode 60; Install and debug oil-water interface control system, making device be in dormant state.
(2) utilize dropper that a certain amount of crude oil is injected electrolytic cell inner core 28 by crude oil injection with recovery holes 23, crude oil needs to be heated to probe temperature in advance and deoxygenation of ventilating; For guaranteeing data stability in test process, water-oil interface should control to identify two in water-oil interface high limit and lower bound and limit between line, avoid the salt bridge point pipe 180 of platinum to electrode 19 and contrast electrode 18 to be subject to crude oil pollution.
(3) start rotating disk electrode (r.d.e) system, and under specific rotation speeds, make disk electrode 6 smooth rotation; Open electrochemical workstation 1 and related software, first test open circuit potential and be about 600s or make it reach stable for more time.
(4) Potentiostatic corrosion test is carried out, record current--time changing curve; Simultaneously, oil-water interface control device is set, the water-oil interface reciprocation period of setting float 9 point-to-point speed, distance and disk electrode 6 conducting surface (is water-wet when conducting surface touches aqueous phase, be glossy wet when touching oil phase, control alternately wetting cycle by float movement), need during setting parameter according to specific requirement determination water-oil interface initial position and in oil phase and aqueous phase residence time etc.; It should be noted that, Potentiostatic corrosion testing current starts in aqueous phase, after about 1 ~ 2 minute or after reaching experiment setting-up time, start oil-water interface control system most, water-oil interface start periodically to pump, and enter the profit alternately wetting corrosion test stage.
(5) after experiment test terminates, first stop electro-chemical test, and close electrochemical workstation, remove connecting line; Then stop oil-water interface control device, float is left the water; Rotating disk electrode (r.d.e) is mentioned, with suction pipe by whole for crude oil sucking-off, avoids in subsequent treatment, pollute contrast electrode and to electrode; Cleaning electrolytic cell;
(6) data analysis: the conducting surface surface corrosion pattern of disk electrode 6 carries out microexamination; Electric current--time response, curve carried out statistical study, specifically can need according to research the analysis carrying out the aspects such as corrosion current, transient state peak number order and shape.
Fig. 6 and 7 utilizes said apparatus of the present utility model and method to test the current time change curve obtained.Wherein Fig. 6 experiment condition is set as disk electrode rotating speed 1200 revs/min, and water-oil interface reciprocation period is that 2.15s(relies on the speed that moves up and down and distance two variable elements to regulate); Fig. 7 experiment condition is set as disk electrode rotating speed 600 revs/min, and water-oil interface reciprocation period is 5.0s.Experimental temperature is 30 DEG C, and viscosity of crude is 4.3 centipoises, continues logical CO in corrosion process
2gas.Externally-applied potential is more than open circuit potential+100mV.
In experimentation, the precontract 40s time is that working electrode 60 stops in aqueous, test obtains the current signal of continous-stable change, start along with profit alternately soaks simulated experiment, electric current presents transient swing, and the current temporary state peak duration depends on the alternately wetting parameter such as frequency and viscosity of crude, and current peak intensity depends on the stability of aqueous phase, and the change of transient state peak number object may be relevant in the rule of adsorption and desorption to crude oil, can deeply disclose crude oil corrosion inhibition thus.
In conjunction with concrete condition and base oil properties, multiple statistical analysis technique can be introduced for corrosion current signal, and disclose the mechanism of action of crude oil to corrosion of carbon steel under alternately wetting (being controlled by water-oil interface reciprocation period) environment.Wherein, t
0to t
1the average corrosion current density in moment can solve by following formula:
dt
According to above formula, two cover electric currents can be solved in accompanying drawing 5---time response curve average corrosion current density.Corresponding to 1200rpm, wetting cycle 2.15s situation, the average corrosion electric current calculated is 96.2 microamperes; Corresponding to 600rpm, wetting cycle 5.0s situation, the average corrosion electric current calculated is 35.6 microamperes.In computation process, choosing current integrating time section is between 40 seconds to 300 seconds.Can judge thus, when lower, the wetting frequency of rotating speed is lower, crude oil is alternately wetting has better corrosion inhibition, and crude oil is more not easy from steel surface desorption.Thus, by statistical study, realize profit and replace corrosion regularity quantitative examination in wet environment.
The beneficial effects of the utility model:
(1) inner-walls of duct corrosion simulated research under different profit alternating action condition is realized:
Utilize the function that rotating disk electrode (r.d.e) rotating speed is adjustable, laboratory simulation profit being replaced to the metal erosion situation under Wet Out under different fluid flow velocity can be realized, and then profit can be studied replace the impact that rate of flow of fluid under Wet Out causes metal erosion.The adjustable range of speeds is 0 ~ 2000rpm.
Utilize the controllable precise function of stepper motor reciprocating frequency, the laboratory simulation to the metal erosion situation under different profit alternately wetting frequency content can be realized, so can study profit to replace under Wet Out profit alternately wetting frequency on the impact of metal erosion.Adjustable frequency scope is 0.01 ~ 2.0Hz, depends on that stepper motor precision and power pulses are arranged.
By changing experiment oil product used or temperature, the metal erosion laboratory simulation in different viscosities oil product situation can be realized, so can study profit replace Wet Out under oil viscosity on the impact of metal erosion.Adjustable temperature scope is room temperature to 80 DEG C.
By changing experiment electrode material used and surface state (as different roughness, surperficial membranae praeformativa situation), laboratory simulation profit being replaced to the corrosion condition under different metal materials under Wet Out and different surfaces state thereof can be realized, so can study profit replace different metal materials under Wet Out and different surfaces state thereof under corrosion condition.
(2) profit replaces corrosion inhibiter effect Fast Evaluation under wetting conditions:
Corrosion inhibiter is widely used in oilfield transportation system and sewerage, adopts electrochemical method to evaluate its corrosion mitigating effect and have the features such as fast and reliable in laboratory.But, current For Evaluation of Effectiveness of Inhibitors result mainly based on aqueous environment test, for replacing the research method that the effect assessment of corrosion inhibiter is unripe under wetting conditions containing crude oil situation and profit.The utility model provides a kind of quick, easy, reliable electrochemical test method, replaces corrosion of carbon steel behavior under wet environment, thus determine the reasonable addition of corrosion inhibiter, for scene complicated polyphasic flow environment provides more direct comparable data by simulating oil-water.The research method impelling the utility model to set forth is used widely by the features such as quick, the Real-Time Monitoring that electrochemical test method has in corrosion inhibiter evaluation, reference frame fast and effectively will be provided for field produces, improve production security and efficiency.
The utility model provides a kind of crude oil that deeply discloses and soaks the method with steel surface corrosion research under water-wet alternating action, and the experimental data obtained is significant for the relevant understanding of expansion corrosion field.More research is also needed to support for the parsing that experimental data is more careful and deep.
The above embodiment is only for absolutely proving the preferred embodiment that the utility model is lifted, and protection domain of the present utility model is not limited thereto.The equivalent alternative or conversion that those skilled in the art do on the utility model basis, all within protection domain of the present utility model.Protection domain of the present utility model is as the criterion with claims.
Claims (8)
1. a profit alternately wetting corrosion simulated device, is characterized in that, comprising:
Electrochemical signals disposal system, it is one can the electrochemical workstation of record current signal, and this electrochemical workstation has working electrode terminal, contrast electrode terminal and to electrode terminal;
Profit is wetting simulation electrolytic cell alternately, and comprise electrolytic cell urceolus and be sheathed on electrolytic cell inner core in electrolytic cell urceolus, electrolytic cell inner core is communicated with electrolytic cell urceolus; The platinum that is electrically connected with to electrode terminal is provided with to electrode and the contrast electrode that is electrically connected with contrast electrode terminal in electrolytic cell inner core;
Rotating disk electrode (r.d.e) system, comprises the rotating driving device of disk electrode and driver plate electrode rotary, and disk electrode stretches in electrolytic cell inner core; Platinum is positioned at the below of disk electrode to electrode, and this platinum is parallel with the bottom surface of disk electrode to electrode; The tip of the salt bridge point pipe of contrast electrode is positioned over platinum between electrode and the bottom surface of disk electrode; Wherein, the bottom surface of described disk electrode be conducting surface as working electrode, the remainder insulation of disk electrode outside surface, working electrode is electrically connected with working electrode terminal; Or the side of described disk electrode establishes a ring shaped conductive face as working electrode, the remainder insulation of disk electrode outside surface, working electrode is electrically connected with working electrode terminal;
Oil-water interface control system, comprising: float and for controlling the perpendicular displacement control device that float moves up and down, and wherein, float extend between electrolytic cell urceolus and electrolytic cell inner core;
Aerating system, comprises the aeration head be arranged in electrolytic cell urceolus, outside electrolytic cell inner core and the gas supply device be communicated with described aeration head by vent line;
For alternately soaking the temperature control system of simulation electrolytic cell heating to profit.
2. profit according to claim 1 alternately wetting corrosion simulated device, it is characterized in that, described perpendicular displacement control device, comprise: fixed mount, step-by-step motor, motor control unit and accurate thread guide rod, be fixed on fixed mount after step-by-step motor is connected with motor control unit, step-by-step motor is connected with float by accurate thread guide rod.
3. profit according to claim 1 alternately wetting corrosion simulated device, is characterized in that, described temperature control system comprises the heat tape being wound in the outer drum outer wall of electrolytic cell and the temperature control unit be electrically connected with described heat tape.
4. profit according to claim 1 alternately wetting corrosion simulated device, it is characterized in that, electrolytic cell inner core upper bottom surface envelope be provided with the external end face of corrosion cell, the external end face of this corrosion cell be provided with crude oil inject with recovery holes, rotating disk electrode (r.d.e) jack, reference electrode reference electrode plug, to Electrode connection hole and spiracle; The wire be connected with to electrode terminal through described to Electrode connection hole and platinum to Electrode connection; Contrast electrode is fastened in reference electrode reference electrode plug; Disk electrode is connected and fixed on described rotating driving device, and is inserted in electrolytic cell inner core by described rotating disk electrode (r.d.e) jack.
5. profit according to claim 1 alternately wetting corrosion simulated device, it is characterized in that, the cross-sectional area of described electrolytic cell urceolus is more than 2 times of float drainage area.
6. profit according to claim 1 alternately wetting corrosion simulated device, is characterized in that, described disk electrode is made up of wire, insulation crust and the conductive core that is connected with this wire, and this wire is electrically connected with described working electrode terminal;
Wherein, the bottom surface of this insulation crust is provided with opening, and this opening shape is identical with the bottom surface of conductive core, and the bottom surface of conductive core is fastened on this opening part as working electrode; Or this insulation crust is made up of upper and lower two parts, this upper and lower two-part xsect is identical with conductive core, and conductive core is clipped in the middle by these upper and lower two parts, thus forms ring shaped conductive face in the side of insulation crust as working electrode.
7. profit according to claim 1 alternately wetting corrosion simulated device, it is characterized in that, described electrolytic cell inner core is provided with liquid level scale device.
8. profit according to claim 1 alternately wetting corrosion simulated device, it is characterized in that, described platinum is less than 2cm to the distance between electrode and working electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520432871.0U CN204807432U (en) | 2015-06-23 | 2015-06-23 | Profit is moist analogue means that corrodes in turn |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520432871.0U CN204807432U (en) | 2015-06-23 | 2015-06-23 | Profit is moist analogue means that corrodes in turn |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092460A (en) * | 2015-06-23 | 2015-11-25 | 中石化石油工程设计有限公司 | Oil-water alternating wetting corrosion simulation device and method |
| 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 |
| CN109064852A (en) * | 2018-08-28 | 2018-12-21 | 齐齐哈尔大学 | A kind of method of alternative electric generation |
-
2015
- 2015-06-23 CN CN201520432871.0U patent/CN204807432U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092460A (en) * | 2015-06-23 | 2015-11-25 | 中石化石油工程设计有限公司 | Oil-water alternating wetting corrosion simulation device and method |
| CN105092460B (en) * | 2015-06-23 | 2017-12-01 | 中石化石油工程设计有限公司 | Profit alternately soaks corrosion simulated device and method |
| 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 |
| CN106644913B (en) * | 2017-01-12 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of evaluation method of crude oil gathering system corrosion inhibiter |
| CN109064852A (en) * | 2018-08-28 | 2018-12-21 | 齐齐哈尔大学 | A kind of method of alternative electric generation |
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