CN104515692A - Rapid evaluation system and rapid evaluation method for electrostatic coalescence - Google Patents
Rapid evaluation system and rapid evaluation method for electrostatic coalescence Download PDFInfo
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Abstract
Disclosed are a rapid evaluation system and a rapid evaluation method for electrostatic coalescence. By the rapid evaluation system and the rapid evaluation method, coalescence effect of coaxially cylindrical electrostatic coalescers can be evaluated, and electric field parameters can be optimized. The rapid evaluation system comprises a power supply device, a small electrostatic coalescer and a measuring device. The power supply device refers to a waveform generator and a high-voltage current amplifier and is capable of applying high voltage to the small electrostatic coalescer to enable water drops in a water-in-oil emulsion to coalesce. An oscilloscope connected to the high-voltage current amplifier is capable of displaying voltages and currents between two electrodes in real time and collecting and storing the voltages and the currents for energy consumption ratio analysis. Changes before and after water drop grain diameter electrification are analyzed by combing microscopic photographing with an image processing technique, and water settling rate and separation effect can be analyzed by a gravity settling method, so that the optimal electric field parameters are determined. The rapid evaluation system and the rapid evaluation method have the advantages of convenience in use and rapidness in testing, the basis can be provided for design of the electrostatic coalescers and equipment selection, equipment design is more reasonable, and high efficiency in use is achieved.
Description
Technical field
The invention belongs to a kind of electrostatic coalescence RES(rapid evaluation system) and method, for evaluating the coalescent effect of coaxial circles tubular electrostatic coalescer, carry out preferably to electric pulse field parameters such as electric field intensity, electric field frequency and electric field waveforms, belong to oil-gas gathering and transportation system oil field mining liquid dehydration technique field.
Background technology
Oil field mining liquid is seldom pure crude oil, generally all includes associated water and solution gas.In crude oil, free water sedimentation separation is quite fast, but is then difficult to be separated with the water that form of emulsion exists, and therefore after triphase separator, usually also needs electrical dehydrator process water-in-oil emulsion.Its ultimate principle applies high-strength electric field to emulsion fluid, increases collision and the gathering of dispersion water droplet, promote water droplets coalescence, accelerate oil and water separation.
Traditional electrical dehydrator mostly is horizontal tank structure, and netted bare metal electrode hierarchy is arranged in tank body top, adjacent electrode applies different voltage, forms electric field therebetween.Because electrode is exposed, easily between electrode, form conduction current, not only added energy consumption but also brought the danger of short circuit, therefore novel electrostatic coalescer arises at the historic moment.Novel electrostatic coalescer adopts insulating electrode and metal electrode to be alternately arranged composition usually, and insulating electrode is made up of metal electrode and insulation course.US Patent No. 6136174 discloses a kind of dehydration of crude oil electrostatic coalescer (CEC), and its electrode part is alternately arranged with the form of coaxial cylinders by insulating electrode and metal electrode.Chinese patent 200710015911.1 (granted patent notification number CN 101173182A) discloses a kind of crude oil emulsion electrostatic dehydrator, its coalescing section is arranged on electrical dehydrator top, and electrode part is also be alternately arranged with the form of coaxial cylinders by insulating electrode and metal electrode.The advantages such as the electrode of this form takes full advantage of space, has compact conformation, and floor area is little.At present, electrostatic coalescer product is debugged, to determine running parameter mostly after use in-site installation again.But the water-in-oil emulsion physico-chemical property formed due to different blocks is different, the electric field intensity, electric field frequency and electric field waveform etc. of effective voltolisation knot can be realized also different to water droplet, therefore before electrostatic coalescer is installed, evaluate the coalescent effect after water-in-oil emulsion energising, preferred electric pulse field parameter, significant for purchasing of the design of electrostatic coalescer and potential device.
The assay method of crude oil water percentage mainly contains " the mensuration way of distillation of GB/T 8929-2006 water content in crude oil " and " the de-method of mensuration electricity of SY/T5402-2008 water content in crude oil ".The way of distillation time is longer, tests at least one hour for one group.The de-analyser of DTS type crude oil water containing electricity that current oil field is commonly used forms by by high-frequency high-voltage pulse generator, dehydration electrode and glass metrology cylinder etc.But this equipment also exists certain defect, as there is air between external electrode and glass metrology cylinder, electric field is caused to change; Be pyramidal structure bottom metering cylinder, electric field is distorted, reduce electric field degree of accuracy; High-voltage pulse generator only can output pulse signal, can not carry out preferably waveform signal.
In view of above reason, be necessary to invent method and the experimental system that can carry out Fast Evaluation to electrostatic coalescence effect, can carry out preferably to the optimum electric pulse field parameter of the water-in-oil emulsion of different blocks, for the design and running of electrostatic coalescer provides foundation, make equipment de-sign more reasonable, use more efficient.
Summary of the invention
A kind of electrostatic coalescence RES(rapid evaluation system) of the present invention and method, different for the optimum electric pulse field parameter of different water-in-oil emulsion, the feature that electrostatic coalescence device context debug time is longer, Fast Evaluation can be carried out to water-in-oil emulsion electrostatic coalescence effect and carry out preferably to electric pulse field parameter, its experimental result can provide foundation for the design of electrostatic coalescer, for the type selecting of power-supply unit is offered help, electrostatic coalescence equipment is run more efficiently.
A kind of electrostatic coalescence RES(rapid evaluation system), comprises high-voltage power supply amplifier and oscillograph, the fractional analysis system that characterized by further comprising AWG (Arbitrary Waveform Generator), small-sized electrostatic coalescer, water-bath and be made up of microscope, digital camera and computing machine, described AWG (Arbitrary Waveform Generator) exports small-sized electrostatic coalescer to by high-tension cable after high-voltage power supply amplifier amplifies, and high-strength electric field is produced in small-sized electrostatic coalescer, described small-sized electrostatic coalescer controls steady temperature by water-bath, described small-sized electrostatic coalescer feeds back the voltage and current signal and exports oscillograph to respectively by voltage signal line and current signal line, the water-oil emulsion Liquid particle image taken out in small-sized electrostatic coalescer after described digital camera is terminated by microscope photographing electric field action, and export to computing machine obtain drop particle diameter distribution,
Described small-sized electrostatic coalescer comprises the Water Tank with Temp.-controlled being provided with water delivering orifice and water inlet, be positioned at the glass insulation cylinder of Water Tank with Temp.-controlled, upper and lower for glass insulation cylinder two ends are carried out the top end cap closed and concentric fixed leg, and have high-field electrode to be inserted into the concentric fixed leg bottom glass insulation cylinder from top end cap, be full of electrolyte in Water Tank with Temp.-controlled and be provided with a ground-electrode post, described electrolyte and ground-electrode post form liquid electrode;
The water delivering orifice of described Water Tank with Temp.-controlled is connected with water-bath respectively with water inlet.
Described top end cap central is provided with axial central through hole, described concentric fixed leg upper surface center is provided with axial cylinder shape groove, described high-field electrode is through above-mentioned central through hole, and end is positioned at cylinder shape groove and realizes keeping coaxial with glass insulation cylinder.
Water-bath is connected on Water Tank with Temp.-controlled by the water inlet of tank and water delivering orifice, and the electrolyte in Water Tank with Temp.-controlled is NaCl solution.
Ultimate principle of the present invention utilizes temperature controlled water baths, water-in-oil emulsion is placed in small-sized electrostatic coalescer, utilize the waveform required for waveform generator generation, voltage and frequency, after the relation amplification that 1:2000 pressed by high-voltage power supply amplifier, be transferred on small-sized electrostatic coalescer by high-tension cable, impel the water droplet in water-in-oil emulsion, under electric field action, dipole coalescence occurs, electrophoresis is coalescent, dielectrophoresis is coalescent and vibration is coalescent, thus promotion water droplets coalescence, particle diameter becomes large, then analyze by photomicrograph combining image treatment technology the change that drop particle diameter powers up front and back, also subsidence rate and the separating effect of gravity settling methods analyst water can be utilized, thus determine optimum electric field form, electric field intensity, electric field frequency and action time etc. parameter.In above-mentioned power-up procedures, oscillograph is connected on high-voltage power supply amplifier for monitoring and recording voltage and electric current by voltage signal line and current signal line.
Advantage of the present invention is: (1) compact, compact conformation; (2) test specification is wide, the mode adopting arbitrary waveform signal generator and high-voltage power supply amplifier to combine can provide random waveform, can meet field strength range at 0 ~ 20000V/cm, electric field frequency is the evaluation of water-in-oil emulsion voltolisation junction characteristic under any electric field waveform effect between 0 ~ 20kHz; (3) small-sized electrostatic coalescer utilizes NaCl solution as ground-electrode, to avoid between ground-electrode and high-field electrode clearance to the impact of electric field; Smooth bottom glass insulation cylinder, and non-tapered, ensure graduated cylinder internal electric field stable and consistent; (4) glass does insulation course and can carry out sedimentation observation; (5) photomicrograph combining image treatment technology is adopted to analyze drop change of size more convenient than the method for traditional utilization distillation survey water percentage; (6) oscillograph monitoring high-voltage power supply amplifier voltage and curent change is adopted can to observe waveform distortion situation, and power when calculating high-voltage power supply amplifier operation, for electric pulse field parameter preferably provides reference.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein: 1-AWG (Arbitrary Waveform Generator), 2-high-voltage power supply amplifier, 3-voltage signal line, 4-current signal line, 5-oscillograph, 6-high-tension cable, 7-small-sized electrostatic coalescer 8-water-bath, 9-microscope, 10-digital camera, 11-computing machine.
Fig. 2 is small-sized electrostatic coalescer structural representation of the present invention.
Wherein, 12-high-field electrode, 13-ground-electrode post, 14-top end cap 15-water delivering orifice, 16-glass insulation cylinder, 17-fixed leg 18-water inlet 19-Water Tank with Temp.-controlled with one heart.
Fig. 3 is the cut-open view of top end cap.
Wherein, 20-central through hole.
Fig. 4 is the cut-open view of concentric fixed leg.
Wherein, 21-cylinder shape groove.
Embodiment
See accompanying drawing 1, the present invention is made up of AWG (Arbitrary Waveform Generator) (1), high-voltage power supply amplifier (2), voltage signal line (3), current signal line (4), oscillograph (5), high-tension cable (6), small-sized electrostatic coalescer (7), water-bath (8), microscope (9), digital camera (10), computing machine (11) etc.
See accompanying drawing 2, small-sized electrostatic coalescer of the present invention mainly comprises high-field electrode (12), ground-electrode post (13), top end cap (14), tank outlet (15), glass dielectric layer (16), with one heart fixed leg (17), the various pieces such as tank entrance (18) and Water Tank with Temp.-controlled (19).High-field electrode (12) and ground-electrode post (13) are cylindrical, copper electrode, and glass dielectric layer (16) and Water Tank with Temp.-controlled (19) are cylindrical shape, and material is glass.Top end cap (14) and concentric fixed leg (17) cylindrical, material is teflon, and effect ensures that high-field electrode (12) and glass dielectric layer (16) keep coaxially.Water-bath (8) is connected on Water Tank with Temp.-controlled (19) by tank entrance (18) and tank outlet (15), NaCl solution is filled between Water Tank with Temp.-controlled (19) and glass dielectric layer (16), and insert ground-electrode post (13), water in whole like this Water Tank with Temp.-controlled (19) is iso-electric, become ground-electrode, high-voltage electric field will be formed after energising act on water-in-oil emulsion between high-field electrode (12) and glass dielectric layer (16) between ground-electrode and high-field electrode (12), promote water droplets coalescence, oil and water separation.
As Fig. 1-4, a kind of being used for is evaluated electrostatic coalescence effect, preferred fast appraisement method and system are carried out to electric pulse field parameter, comprising: AWG (Arbitrary Waveform Generator) (1), high-voltage power supply amplifier (2), voltage signal line (3), current signal line (4), oscillograph (5), high-tension cable (6), small-sized electrostatic coalescer (7), water-bath (8), microscope (9), digital camera (10), computing machine (11) etc.It is characterized in that: AWG (Arbitrary Waveform Generator) (1) and high-voltage power supply amplifier (2) composition electric supply installation, can provide electric pulse field parameter needed for experiment for small-sized electrostatic coalescer (7).Electrical parameter measuring device is oscillograph (5), is connected on high-voltage power supply amplifier (2) by voltage signal line (3) and current signal line (4) to measure the electrical quantitys such as output waveform, voltage, electric current and frequency in real time.Water-bath (8) is connected to Water Tank with Temp.-controlled (19) to control the temperature of water-in-oil emulsion.Microscope (9), digital camera (10) and computing machine (11) composition photomicrograph measurement mechanism, water droplets coalescence effect under size droplet diameter can being measured and evaluating electric field action.
NaCl solution is full of between Water Tank with Temp.-controlled (19) and glass dielectric layer (16), ground-electrode post (13) is inserted in NaCl solution, NaCl solution is made to become equipotential system---ground-electrode, can form high-voltage electric field and act on water-in-oil emulsion between high-field electrode (12) and glass dielectric layer (16) between ground-electrode and high-field electrode (12) after energising.Electrode (12) and glass dielectric layer (16) keep coaxial.
High-field electrode (12) and ground-electrode post (13) are cylindrical electrode, and material is brass, and there is screw thread on top to be connected with high-tension cable.
Glass dielectric layer (16) and Water Tank with Temp.-controlled (19) are cylindrical shape, and diameter is consistent up and down, and material is glass, conveniently can observe the sedimentation situation of water.
Top end cap (14) and concentric fixed leg (17) cylindrical, material is teflon, wherein top end cap (14) has a central through hole (20), and diameter is consistent with high-field electrode (12) diameter.Concentric fixed leg (17) external diameter is consistent with glass dielectric layer (16) inner diameter, and cylinder shape groove (21) diameter is consistent with high-field electrode (12) diameter.Top end cap (14) and concentric fixed leg (17) are positioned between high-field electrode (12) and glass dielectric layer (16), make the two keep coaxial.
Utilize above-mentioned electrostatic coalescence RES(rapid evaluation system) water-in-oil emulsion sample to be carried out to the method for voltolisation junction characteristic analysis, comprising:
1) utilize digital camera (10) by the image of microscope (9) shooting water-in-oil emulsion drop, and export computing machine (11) to and obtain original domain size distribution;
It is characterized in that comprising the following steps:
2) water-in-oil emulsion is injected the glass insulation cylinder (16) of small-sized electrostatic coalescer (7), and close with top end cap (14);
3) utilize AWG (Arbitrary Waveform Generator) (1) to produce random waveform, the waveform signal of generation is transferred on small-sized electrostatic coalescer (7) by high-tension cable (6) and applies high-strength electric field promotion water droplets coalescence to water-in-oil emulsion after high-voltage power supply amplifier (2) amplifies by the relation of 1:2000; The initial power-up time is random time, is designated as T1;
4) energising is stopped, water-in-oil emulsion fine-still in small-sized electrostatic coalescer (7) is gone out, drip in microslide, and re-use the image of digital camera (10) by microscope (9) shooting water-in-oil emulsion drop, and export to computing machine (11) obtain first time energising after domain size distribution;
5) domain size distribution of step 4 and the domain size distribution of step 1 are compared, repeat the operation of step 2, obtained the domain size distribution of water-in-oil emulsion sample under different electric pulse field parameter (comprising waveform, field intensity, frequency etc.), power-up time by control variate method;
Or after step 4 terminates, continue the volume of the small-sized electrostatic coalescer of observed and recorded (7) bottom sedimentation water outlet, and the corresponding relation drawing sedimentation water outlet volume and power-up time carries out contrasting with preferred electric pulse field parameter and power-up time.
The course of work of the present invention is: the water-in-oil emulsion of Oil Field Produced Liquid or indoor configuration is heated to experimental temperature, then microscope (9) and digital camera (10) is used to carry out photomicrograph, and be transferred to computing machine (11) and analyzed by image processing software, obtain drop initial particle and distribution.Open top end cap (14), emulsion fluid is added between high-field electrode (12) in small-sized electrostatic coalescer (7) and glass dielectric layer (16), open water-bath (8) simultaneously and ensure that emulsion temperature meets requirement of experiment and keeps constant.After top end cap (14) is covered, the signal (certain waveform, voltage and frequency) that opening AWG (Arbitrary Waveform Generator) (1) generation experiment needs is transferred on the high-field electrode (12) in small-sized electrostatic coalescer (7) by high-tension cable (6) after high-voltage power supply amplifier (2) amplifies, and utilizes the high-strength electric field formed between high-field electrode (12) and ground-electrode to impel the generation of the water droplet in water-in-oil emulsion coalescent and sedimentation.In galvanization, oscillograph (5) is connected to the voltage and current monitoring port of high-voltage power supply amplifier (2) by voltage signal line (3) and current signal line (4), two inter-electrode voltages and current signal change curve in experimentation can be shown on oscillograph, and gather and stored waveform, and precision is higher, be convenient to carry out observing and aftertreatment, rated output.After powering up certain hour, stop powering up and use water droplet micrograph in microscope (9) and digital camera (10) shooting emulsion fluid and analyze drop size and distribution by image processing techniques, then contrast with drop initial particle, to evaluate droplet coalescence effect.Stop the volume that also can continue the sedimentation water outlet of the small-sized electrostatic coalescer of observed and recorded (7) bottom after powering up, and the corresponding relation drawing sedimentation water outlet volume and power-up time carries out contrasting with preferred electric pulse field parameter.
Evaluation system of the present invention has the advantage of compact conformation, the structure of actual coalescer can be simulated, can in indoor to multiple waveforms, electric field, the action effect of frequency etc. contrasts, for coalescer design provides parameter, wherein provided parameter mainly contains the waveform of electric field, electric field intensity, electric field frequency, and electric field action time.Its evaluation method has fireballing advantage, by the method for taking pictures than original distillation and sedimentation method fast: the 3rd is the structure of coalescer, utilize water to do ground-electrode, avoid between traditional approach external electrode and insulation course and have air, cause electric field to change; Glass does insulation course can carry out sedimentation observation.Simultaneously glass dielectric layer is that cylindric to avoid electric field than cone shape more reasonable structure inconsistent, adopts the good liquid of conduction then can avoid the electric field caused in prior art and distorts.
Claims (4)
1. an electrostatic coalescence RES(rapid evaluation system), comprise high-voltage power supply amplifier (2) and oscillograph (5), the fractional analysis system that characterized by further comprising AWG (Arbitrary Waveform Generator) (1), small-sized electrostatic coalescer (7), water-bath (8) and be made up of microscope (9), digital camera (10) and computing machine (11); Described AWG (Arbitrary Waveform Generator) (1) exports small-sized electrostatic coalescer (7) to by high-tension cable (6) after high-voltage power supply amplifier (2) amplifies.And high-strength electric field is produced in small-sized electrostatic coalescer (7), described small-sized electrostatic coalescer (7) controls steady temperature by water-bath (8), described small-sized electrostatic coalescer (7) is fed back the voltage and current signal and is exported oscillograph (5) to respectively by voltage signal line (3) and current signal line (4), the water-oil emulsion Liquid particle image of the inner taking-up of small-sized electrostatic coalescer (7) after described digital camera (10) is terminated by microscope (9) shooting electric field action, and export to computing machine (11) obtain drop particle diameter distribution,
Described small-sized electrostatic coalescer (7) comprises the Water Tank with Temp.-controlled (19) being provided with water delivering orifice (15) and water inlet (18), be positioned at the glass insulation cylinder (16) of Water Tank with Temp.-controlled (19), glass insulation cylinder (16) is up and down carried out the top end cap (14) closed and concentric fixed leg (17) in two ends, and have high-field electrode (12) to be inserted into the concentric fixed leg (17) of glass insulation cylinder (16) bottom from top end cap (14), be full of electrolyte in Water Tank with Temp.-controlled (19) and be provided with a ground-electrode post (13), described electrolyte and ground-electrode post (13) form liquid electrode,
The water delivering orifice (15) of described Water Tank with Temp.-controlled (19) is connected with water-bath (8) respectively with water inlet (18).
2. a kind of electrostatic coalescence RES(rapid evaluation system) as claimed in claim 1, it is characterized in that end cap (14) center, described top is provided with axial central through hole (20), described concentric fixed leg (17) upper surface center is provided with axial cylinder shape groove (21), described high-field electrode (12) is through above-mentioned central through hole (20), and end is positioned at cylinder shape groove (21) and realizes keeping coaxial with glass insulation cylinder (16).
3. a kind of electrostatic coalescence RES(rapid evaluation system) as claimed in claim 1, it is characterized in that water-bath (8) is connected on Water Tank with Temp.-controlled (19) by the water inlet (18) of tank and water delivering orifice (15), the electrolyte in Water Tank with Temp.-controlled (19) is NaCl solution.
4. utilize the electrostatic coalescence RES(rapid evaluation system) described in claim 1 water-in-oil emulsion sample to be carried out to the method for voltolisation junction characteristic analysis, comprising:
1) utilize digital camera (10) by the image of microscope (9) shooting water-in-oil emulsion drop, and export computing machine (11) to and obtain original domain size distribution;
It is characterized in that comprising the following steps:
2) water-in-oil emulsion is injected the glass insulation cylinder (16) of small-sized electrostatic coalescer (7), and close with top end cap (14);
3) utilize AWG (Arbitrary Waveform Generator) (1) to produce random waveform, the waveform signal of generation is transferred on small-sized electrostatic coalescer (7) by high-tension cable (6) and applies high-strength electric field promotion water droplets coalescence to water-in-oil emulsion after high-voltage power supply amplifier (2) amplifies by the relation of 1:2000; The initial power-up time is random time, is designated as T1;
4) energising is stopped, water-in-oil emulsion fine-still in small-sized electrostatic coalescer (7) is gone out, drip in microslide, and re-use the image of digital camera (10) by microscope (9) shooting water-in-oil emulsion drop, and export to computing machine (11) obtain first time energising after domain size distribution;
5) domain size distribution of step 4 and the domain size distribution of step 1 are compared, repeat the operation of step 2, obtained the domain size distribution of water-in-oil emulsion sample under different electric pulse field parameter (comprising waveform, field intensity, frequency etc.), power-up time by control variate method;
Or after step 4 terminates, continue the volume of the small-sized electrostatic coalescer of observed and recorded (7) bottom sedimentation water outlet, and the corresponding relation drawing sedimentation water outlet volume and power-up time carries out contrasting with preferred electric pulse field parameter and power-up time.
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| CN112505302A (en) * | 2020-12-01 | 2021-03-16 | 华东理工大学 | Continuous-flow electric field and medium synergistic coalescence demulsification effect evaluation system |
| CN114354691A (en) * | 2021-12-31 | 2022-04-15 | 北京石油化工学院 | Crude oil emulsion electric field demulsification characteristic evaluation device |
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| CN112505302A (en) * | 2020-12-01 | 2021-03-16 | 华东理工大学 | Continuous-flow electric field and medium synergistic coalescence demulsification effect evaluation system |
| CN114354691A (en) * | 2021-12-31 | 2022-04-15 | 北京石油化工学院 | Crude oil emulsion electric field demulsification characteristic evaluation device |
| CN114354691B (en) * | 2021-12-31 | 2023-10-27 | 北京石油化工学院 | Crude oil emulsion electric field demulsification characteristic evaluation device |
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