CN204627572U - A kind of for well thin oil multiviscosisty profile control agent injection control system - Google Patents
A kind of for well thin oil multiviscosisty profile control agent injection control system Download PDFInfo
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- CN204627572U CN204627572U CN201520152663.5U CN201520152663U CN204627572U CN 204627572 U CN204627572 U CN 204627572U CN 201520152663 U CN201520152663 U CN 201520152663U CN 204627572 U CN204627572 U CN 204627572U
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Abstract
The utility model provides a kind of for well thin oil multiviscosisty profile control agent injection control system, it comprises lightning prevention circuit, put thunder strike circuit and adopt the compound lightning protection structure of two-stage, namely adopt gas-discharge tube as first order lightning protection by input port, output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas-discharge tubes, and carry out common mode protection respectively and protect with differential mode, through-current capability reaches 10KV/500A, voltage can be impaired to about 500V; Second level lightning protection is made up of thermistor PTC and TVS pipe, and thermistor plays metering function, and after the pressure limiting of TVS pipe secondary, voltage is clamped at about 6.8V, thus protects 485 modular circuits.It adopts the compound lightning protection structure of two-stage, in use really plays lightning protection effect, avoid deadlock that the factors such as thunderbolt cause, can not the problem such as Long-distance Control.
Description
Technical field
The utility model relates to control field, be specially a kind of for well thin oil multiviscosisty profile control agent injection control system, in particular to a kind of lightning prevention circuit for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system, it is applied in the technology scene of being improved oil recovery rate by exploration.
Background technology
The most of oil field of China adopts waterflooding extraction mode, and the underground supplemented owing to causing after crude oil extraction is in debt, keeps simultaneously or improves formation pressure, realizing the high and stable yields of crude oil.At present, most water flood fields have entered " two high phase " mining phase of High water cut and high recovery percent of reserves, due to oil reservoir self non-homogeneity feature, and waterflood flush function influence for many years, water injection well near wellbore zone non-homogeneous degree aggravates further, causes injecting water along high permeability zone, macropore channelling, is formed and injects water inefficient cycle, less permeable layer water suction is not enough or inhale less than water, greatly lowers water flooding effect.For improving intake profile, improve water flooding effect, Profile Control in Injection Well obtains in oil field development extensively to be paid attention to and application.
This external water injection well that injected by profile control agent must adopt suitable control system; and these control systems often use in the wild; often be subject to (nature) thunderbolt and damage; the situation such as static discharge, transient pulse interference that also often has occurs; not only can cause the damage of the RS485 interface device in control system and communication system, also can the normal work of jamming decision.So a lot of producer all devises lightning prevention circuit at RS485 COM1, but existing design is poor to adverse circumstances adaptive capacity, anti-interference anti-lightning strike DeGrain, one to thunderstorm season, just often occur that profile control agent injection control system crashes, out of contior phenomenon, not only bring harmful effect to user, producer too increases a large amount of maintenance costs simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of for well thin oil multiviscosisty profile control agent injection control system, its its adopt the compound lightning protection structure of two-stage, in use really play lightning protection effect, avoid the profile control agent injection control system that the factors such as thunderbolt cause crash, can not the problem such as Long-distance Control.
According to the first technical scheme of the present utility model, there is provided a kind of for well thin oil multiviscosisty profile control agent injection control system, it comprises lightning prevention circuit, putting thunder strike circuit adopts gas-discharge tube as first order lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas-discharge tubes; Second level lightning protection is made up of thermistor PTC and TVS pipe.
Wherein, gas-discharge tube adopts ceramic enclosed package, and the inner metal electrode by two or several band gap, fills and formed with inert gas (argon gas or neon).Gas-discharge tube Q1 and gas-discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas-discharge tube Q2 holds ground connection.
Preferably, thermistor PTC1 mono-termination 485 bus A hold and gas-discharge tube Q1 and Q2, thermistor PTC1 another termination injection control system 485A hold and transient voltage suppressor TVS1 and TVS2.
Preferably, another termination injection control system 485B of thermistor PTC2 mono-termination 485 bus B end and gas-discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and injection control system 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and injection control system 485B holds.
Further, transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and injection control system 485A hold, another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and injection control system 485B end, transient voltage suppressor TVS3 and ground end.
Beneficial effect: the utility model is used for the lightning-proof protection circuit of profile control agent injection control system; adopt the compound lightning protection structure of two-stage; namely adopt gas-discharge tube as first order lightning protection by input port; output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; after secondary pressure limiting; voltage is clamped at about 6.8V; thus protect 485 modular circuits, avoid the thin oil multiviscosisty profile control agent injection control system that the factors such as thunderbolt cause crash, can not the problem such as Long-distance Control.
Accompanying drawing explanation
Fig. 1 is the change curve of multiviscosisty thin oil profile control agent viscosity under different water cut condition;
Fig. 2 is the flow performance curve of multiviscosisty thin oil profile control agent;
Fig. 3 is multiviscosisty thin oil profile control agent Crude Oil rate of extraction curve;
Fig. 4 is the schematic diagram for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system;
Fig. 5 is the circuit diagram of the lightning-proof protection circuit for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.Additionally, protection domain of the present utility model only should be limited to following concrete structure or parts or design parameter.
A kind of for water injection well in oil fields multiviscosisty thin oil profile control agent and preparation method thereof, it is that one is applicable to water flooding later stage water injection well multiviscosisty thin oil system.The multiviscosisty thin oil profile control agent that the utility model provides have injection process viscosity low, in oil reservoir, contact the feature that viscosity increases fast with formation water, selective shut-off high permeability zone can be realized in oil reservoir, obviously improve oil reservoir intake profile.
The purpose of this utility model is also the Detailed composition providing above-mentioned water injection well multiviscosisty thin oil profile control agent, profile control agent is made up of the thin oil composition that dewaters, thickening agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 80%-98%, thickening agent composition accounts for 1.5%-15%, and auxiliary agent composition accounts for 0.5%-5%.Preferably, be made up of the thin oil composition that dewaters, thickening agent composition and auxiliary agent composition for water injection well in oil fields multiviscosisty thin oil profile control agent, wherein calculate with weight ratio, dehydration thin oil composition accounts for 82%-97%, thickening agent composition accounts for 2.5%-15%, and auxiliary agent composition accounts for 0.5%-3%.More preferably, calculate with weight ratio, dehydration thin oil composition accounts for 97%, and thickening agent composition accounts for 2.5%, and auxiliary agent composition accounts for 0.5%.
The thin oil that dewaters in the multiviscosisty thin oil in-depth profile control that the utility model provides is the crude oil after processed, and moisture content is less than 1%, 50 DEG C, viscosity is less than 50mPa.s under normal pressure.Dehydration thin oil composition is made up of following a few component:
| Saturated hydrocarbons, % | Aromatic hydrocarbons, % | Nonhydrocarbon, % | Asphalitine, % |
| 35.12 | 32.75 | 13.41 | 18.72 |
In the multiviscosisty thin oil in-depth profile control that the utility model provides, the concrete composition of thickening agent is sorbitan fatty acid ester, and HLB value is 4.2, has meet water emulsification thickening feature with crude oil after mixing.
In the multiviscosisty thin oil in-depth profile control that the utility model provides, the concrete composition of auxiliary agent is sorbester p38, and HLB value 2.1, has the performances such as emulsification, thickening, dispersion, helps improve thickening effect.
The purpose of this utility model is also the preparation method providing water injection well multiviscosisty thin oil profile control agent, and this profile control agent is made up of the thin oil that dewaters, thickening agent and auxiliary agent, and three mixes on ground and obtains above-mentioned profile control agent.According to concrete technical scheme of the present utility model, the above-mentioned preparation method being applicable to water injection well multiviscosisty thin oil profile control agent can comprise the following steps:
The first step, 50 DEG C, test moisture content and the viscosity of dewatered oil under normal pressure (0.1013MPa), when moisture content is less than 1%, after viscosity is less than 50mPa.s, be defined as this profile control agent dewatered oil.
Second step, under normal temperature (30 DEG C), normal pressure (0.1013MPa), adds thickening agent, auxiliary agent successively, stirs 1 hour with the speed of 100 revs/min, make it mix, obtain multiviscosisty thin oil profile control agent in above-mentioned dewatered oil.
Fig. 4 is the schematic diagram for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system.Described injection control system is made up of high-pressure water inlet piping, auxiliary agent feed arrangement, thickening agent feed arrangement and a few major part of automatic control system, wherein high-pressure water inlet pipeline 1 is installed successively hand stop valve 2, electric control valve 3, electromagnetic flowmeter 4 and ejector 5, High-Pressure Water through ejector 5 time, crosslinking agent liquid or polymer dry powder can suck in water lines by the negative pressure produced, and add in profile control agent tank 7.Agitator 6 is installed in profile control agent tank, can makes fully to mix into water and medicament.When in tank, liquid level reaches preset value, automatic program is out of service, and motor operated valve cuts out automatically, and profile control agent automatic preparation completes.Stuff level switch 10 installed by the polymer storage tank 9 of auxiliary agent feed arrangement, and discharge outlet installs blanking switch 11 and feeding screw 12, and during feed, polymer falls into hopper 14, it is equipped with stuff level switch 13, and is connected with the ejector 5 on inlet pipeline by flexible pipe.The drive motors of feeding screw, frequency converter and stuff level switch place are wired to control cabinet 20.Thickening agent feed arrangement has installed liquid-level switch 16 on crosslinking agent storage tank 15, and hand-operated valve 17 is housed in exit, is connected to measuring pump 18 subsequently.During charging, crosslinking agent falls into hopper 19, and hopper is connected with the ejector 5 on inlet pipeline by flexible pipe.Measuring pump and liquid-level switch place are wired to control cabinet 20.Automatic control system is by human and machine interface unit, central control unit and detecting unit composition, by detecting flow of inlet water, implement PID to water inlet electric control valve to regulate, carry out hand control box and automatically control two kinds of modes, according to technological requirement, define chain control with crosslinking agent and polymer controls, complete the automatic control of whole system.
Electric control valve can control piper keying and regulate the size of flow of inlet water; The instantaneous delivery of water inlet and accumulative liquid inlet volume can be obtained by electromagnetic flowmeter; High-Pressure Water, when ejector, can produce negative pressure and be sucked in profile control agent tank by medicament.Auxiliary agent feed arrangement forms primarily of polymer storage tank 9, feeding screw 12 and dry powder hopper 14.The stuff level switch 10 that storage tank is installed can realize material low alarm function.The keying of feeding screw is controlled according to inflow and feed time automatically by control program, changes feeding quantity by frequency converter adjustable screw axle rotating speed.During feed, polymer falls into dry powder hopper, and polymer is sucked under suction function by the ejector 5 on flexible pipe and inlet pipeline by hopper.Thickening agent feed arrangement is made up of crosslinking agent storage tank 15, measuring pump 18 and crosslinking agent hopper 19.Liquid-level switch 16 realizes liquid level low alarm function.The keying of measuring pump is controlled according to inflow and feed time automatically by control program, and its feed liquor speed is adjustable.During charging, crosslinking agent falls into hopper 19, and crosslinking agent is sucked under suction function by the ejector 5 on flexible pipe and inlet pipeline by hopper.
In addition; often use in the wild for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system; often be subject to (nature) thunderbolt and damage; lightning prevention circuit is had in the utility model Yu for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system is matching used; specifically shown in Figure 5, Fig. 5 is the circuit diagram of the lightning-proof protection circuit for water injection well in oil fields multiviscosisty thin oil profile control agent injection control system.
The design philosophy of this lightning-proof protection circuit is: adopt the compound lightning protection structure of two-stage, namely adopts gas-discharge tube as first order lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection.First order lightning protection is made up of two gas-discharge tubes, and carry out common mode protection respectively and protect with differential mode, through-current capability reaches 10KV/500A, voltage can be impaired to about 500V.Second level lightning protection is made up of thermistor PTC and TVS pipe, and thermistor plays metering function, and after the pressure limiting of TVS pipe secondary, voltage is clamped at about 6.8V, thus protects 485 modular circuits.
Through test of many times, employ gas-discharge tube and adopt ceramic enclosed package in the utility model, the inner metal electrode by two or several band gap, fills and is formed with inert gas (argon gas or neon).The operating principle of gas-discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas, make the gas breakdown in gas-discharge tube, the gap of gas-discharge tube two interpolar is converted into conduction state by original state of insulation, low-resistance is become by high resistant, voltage after conducting between discharge tube the two poles of the earth maintains the residual voltage level of putting electric arc channel and determining, makes the voltage at electrode two ends be no more than breakdown voltage.Gas-discharge tube is usually used in the first order in multi-level protection circuit or front two-stage, works release Lightning Transient overcurrent and over-voltage effect.Advantage: insulaion resistance is very large, and parasitic capacitance is very little, and carrying out surge protection ability is strong, has symmetry of discharging preferably, is usually used in the protection of communication line.
TVS pipe and transient voltage suppressor are a kind of new products grown up on voltage-stabiliser tube Process ba-sis, and when the high energy impact events of moment is stood at TVS pipe two ends, it can with 10
-12the speed of second-time; its impedance is reduced suddenly; the surge power of simultaneously stability up to thousands of watts; voltage clamp between its two ends is numerically predetermined at one; thus effectively protect component below to damage from the impact of various transient state high energy surge pulse; its static discharge effect can discharge the pulse more than 10000V, more than 60A, and can continue 10ms.TVS pipe has that the response time is fast, transient power is large, electric capacity is low, leakage current is low, breakdown voltage deviation is little, clamping voltage compared with easy to control, little without damage limit, volume, be easy to the advantages such as installation, be widely used in the every field such as computer system, communication apparatus, consumer electronics, power supply, household electrical appliance at present.
With reference to accompanying drawing 5, show in particular the circuit diagram of lightning-proof protection circuit, gas-discharge tube Q1 and gas-discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas-discharge tube Q2 holds ground connection; Thermistor PTC1 mono-termination 485 bus A hold and gas-discharge tube Q1 and Q2, thermistor PTC1 another termination injection control system 485A hold and transient voltage suppressor TVS1 and TVS2; Another termination injection control system 485B of thermistor PTC2 mono-termination 485 bus B end and gas-discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and injection control system 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and injection control system 485B holds; Another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and injection control system 485A end, transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and injection control system 485B end, transient voltage suppressor TVS3 and ground end.
When occurring when being struck by lightning, induced overvoltage is introduced by 485 bus A, B port, and gas-discharge tube Q2 carries out common mode protection, and gas-discharge tube Q1 carries out differential mode protection, and now overvoltage is weakened severely about 500V.When input voltage is excessive, the electric current in thermistor PTC and TVS pipe series loop will become greatly, and when this electric current exceedes the action current of thermistor, the resistance of thermistor becomes rapidly large, whole loop current is diminished rapidly, plays metering function.When voltage is excessive, the impedance of TVS pipe reduces suddenly, and simultaneously stability big current, makes the voltage at its two ends reduce rapidly, and the voltage being input to injection control system 485 module so is just clamped at about 6.8V, achieves lightning protection effect.Repeatedly test in the highest testing standard 10/700us of communication line, 4KV environment, lightning protection effect is good, injection control system working stability, does not occur crashing, communicate the problem such as unsuccessful.
Below by embodiment, the utility model is further described.
Embodiment 1: multiviscosisty thin oil profile control agent is prepared
Preparation experiment simulated formation water, the ion concentration of preparation water is in table 1.Take dehydration thin oil 194g, be placed in 1000ml beaker, add 5..0g thickening agent, 1..0g auxiliary agent in beaker successively, carry out stirring 1 hour with agitator, obtained multiviscosisty thin oil profile control drives agent.
The ion concentration of water prepared by table 1
Embodiment 2: the change of multiviscosisty thin oil profile control agent viscosity under different water cut condition
According to the method preparing multiviscosisty thin oil profile control agent in embodiment 1, respectively to adding stratum Simulated Water in profile control agent, make multiviscosisty thin oil profile control agent under different water cut (10%, 30%, 50%, 70%, 80%, 90%) condition.Be placed in the insulating box constant temperature that temperature is 50 DEG C, with Brookfield DV-II rotation viscometer (temperature 50 C, shear rate 7.34s
-1) measure the viscosity of multiviscosisty thin oil profile control agent.As shown in Figure 1, along with moisture content raises in profile control agent, viscosity obviously increases experimental result, rises to 12000mPa.s by initial 30mPa.s.Show that this profile control agent constantly contacts along with formation water after injecting stratum, profile control agent is moisture to be raised gradually, and viscosity increases fast, and shutoff high permeability zone, improves profile-log of water injection.
Embodiment 3: the flow performance of multiviscosisty thin oil profile control agent
According to the method preparation multiviscosisty thin oil profile control agent in embodiment 1, in 50 DEG C of insulating boxs, to inject the profile control agent of preparation in the one dimension sand-filling tube model of 0.3ml/min speed respectively to long 30cm, diameter 2.5cm, injection rate is 0.5 times of voids volume, sand-filling tube model is moisture is 100%, 5%, after placing 24h, inject stratum Simulated Water, thin oil with 0.3ml/min speed respectively in one dimension sand-filling tube model, pressure change in record experimentation.The flow performance curve of multiviscosisty thin oil profile control agent as shown in Figure 4.Before profile control, the degree of porosity of one dimension sand-filling tube model is 29.58%, and permeability is 0.942 μm
2, moisture after injection profile agent be the permeability of the one dimension sand-filling tube model of 100% is 0.064 μm
2, the sealing ratiod of profile control agent is 93.2%; Moisture be the permeability of the one dimension sand-filling tube model of 5% is 0.512 μm
2, after injection profile agent, permeability is 0.490 μm
2sealing ratiod is 4.3%, illustrate that the high permeability zone that this profile control agent is higher to moisture content has stronger shut-off capacity, to moisture content lower ground permeable formation substantially without plugging action, namely show that the utility model multiviscosisty thin oil profile control agent has the feature of shutoff water layer and stifled oil reservoir.
Embodiment 4: the multiviscosisty thin oil profile control agent Crude Oil rate of extraction
According to the method preparation multiviscosisty thin oil profile control agent in embodiment 1, in 50 DEG C of insulating boxs, to inject the profile control agent of preparation in the one dimension sand-filling tube model of 0.3ml/min speed respectively to long 30cm, diameter 2.5cm, injection rate is 1.0 times of voids volumes, sand-filling tube model is moisture is 100%, after placing 24h, injects stratum Simulated Water with 0.3ml/min speed respectively in one dimension sand-filling tube model, the crude oil amount be plucked out of in record experimentation, till the port of export is not fuel-displaced.Multiviscosisty thin oil profile control agent crude oil rate of extraction curve as shown in Figure 5.Crude oil is not contained in one dimension sand-filling tube model before profile control, degree of porosity is 30.1%, injection profile agent Crude Oil volume is 44.2ml, the crude oil volume that water drive terminates rear extraction is 36.3ml, the crude oil rate of extraction is 82.1%, show that in the utility model profile control agent, most of crude oil can be gone out by back production, not only significantly reduces experimentation cost, and does not produce injury effect to oil reservoir.
Embodiment 5: multiviscosisty thin oil profile control agent and viscoplasticity Weak Gels class performance of profile modification parameter comparison
According to the method preparing multiviscosisty thin oil profile control agent in embodiment 1, prepare moisture be 70% multiviscosisty thin oil profile control agent, under 80 DEG C of conditions, carry out viscosity, heat stability, shutoff efficiency with viscoplasticity Weak Gels class profile control agent, improve the performance parameter such as oil displacement efficiency, the rate of extraction and contrast, as shown in table 1, multiviscosisty thin oil profile control agent functional performance of the present utility model is obviously better than conventional viscoplasticity Weak Gels class profile control agent, can increase substantially oil displacement efficiency.
Following table is multiviscosisty thin oil profile control agent and viscoplasticity Weak Gels class performance of profile modification parameter comparison.
| Performance parameter | Multiviscosisty thin oil profile control agent | Viscoplasticity Weak Gels class profile control agent |
| Viscosity, mPa.s | 8500 | 1255 |
| Heat stability, d | 30 | 11 |
| Shutoff efficiency, % | 98.5 | 85.7 |
| Improve oil displacement efficiency, % | 20.3 | 9.5 |
| The rate of extraction, % | 81.5 | 4.8 |
The above; be only the utility model preferably detailed description of the invention; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present utility model of claims definition, can make various amendment in form and details.
Claims (6)
1. one kind for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, it comprises lightning prevention circuit, putting thunder strike circuit adopts gas-discharge tube as first order lightning protection by input port, and output port adopts thermistor to add transient voltage suppressor diode as second level lightning protection; First order lightning protection is made up of two gas-discharge tubes; Second level lightning protection is made up of thermistor PTC and TVS pipe.
2. for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, gas-discharge tube adopts ceramic enclosed package according to according to claim 1, and the inner metal electrode by two or several band gap, inside is filled with inert gas.
3. according to described in claim 1 or 2 for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, gas-discharge tube Q1 and gas-discharge tube Q2 is connected in parallel on the two ends of 485 buses, and wherein the G of gas-discharge tube Q2 holds ground connection.
4. according to described in claim 1 or 2 for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, thermistor PTC1 mono-termination 485 bus A hold and gas-discharge tube Q1 and Q2, thermistor PTC1 another termination energy meter 485A hold and transient voltage suppressor TVS1 and TVS2.
5. according to described in claim 1 or 2 for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, another termination energy meter 485B of thermistor PTC2 mono-termination 485 bus B end and gas-discharge tube Q1 and Q2, thermistor PTC2 holds and transient voltage suppressor TVS1 and TVS3; Transient voltage suppressor TVS1 mono-termination thermistor PTC1 and energy meter 485A holds, another termination thermistor PTC2 of transient voltage suppressor TVS1 and energy meter 485B holds.
6. according to described in claim 1 or 2 for well thin oil multiviscosisty profile control agent injection control system, it is characterized in that, another termination transient voltage suppressor TVS3 of transient voltage suppressor TVS2 mono-termination transient voltage suppressor TVS1 and energy meter 485A end, transient voltage suppressor TVS2 and ground end; Another termination transient voltage suppressor TVS2 of transient voltage suppressor TVS3 mono-termination transient voltage suppressor TVS1 and energy meter 485B end, transient voltage suppressor TVS3 and ground end.
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Granted publication date: 20150909 Termination date: 20190314 |