CN204633327U - A kind of for oil well thin oil multiviscosisty water shutoff agent injection control system - Google Patents
A kind of for oil well thin oil multiviscosisty water shutoff agent injection control system Download PDFInfo
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- CN204633327U CN204633327U CN201520146170.0U CN201520146170U CN204633327U CN 204633327 U CN204633327 U CN 204633327U CN 201520146170 U CN201520146170 U CN 201520146170U CN 204633327 U CN204633327 U CN 204633327U
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Abstract
The utility model provides a kind of for oil well thin oil multiviscosisty water shutoff agent injection control system, it comprises lightning prevention circuit, lightning prevention circuit adopts 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 system field, be specially a kind of for oil well thin oil multiviscosisty water shutoff agent injection control system, in particular to a kind of lightning prevention circuit for oil well thin oil multiviscosisty water shutoff 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, to there is after premature water breakthrough, water logging the problems such as High water cut in major part oil well, fluid swivels discharge pressure is greater than oil-producing formation and goes out oil pressure, oil well production oil reservoir energy declines, oil pumper pump efficiency reduces, and increases ground dehydrating plant load, reduces oil reservoir ultimate recovery.Therefore, in order to suppress oil field to enter high water-cut stage too early, improving oil field whole development effect, taking suitable water blockoff measure very necessary.
This external oil well that injected by water shutoff agent must adopt suitable control system; and these control system 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 in RS485 communication port, but existing design is poor to adverse circumstances adaptive capacity, anti-interference anti-lightning strike DeGrain, one to thunderstorm season, just often occur that water shutoff 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 oil well thin oil multiviscosisty water shutoff agent injection control system, it comprises lightning prevention circuit, lightning prevention circuit adopts the compound lightning protection structure of two-stage, in use really play lightning protection effect, avoid the water shutoff agent injection control system that the factors such as thunderbolt cause crash, can not the problem such as Long-distance Control.
According to the technical solution of the utility model, there is provided a kind of for oil well thin oil multiviscosisty water shutoff agent injection control system, it comprises lightning prevention circuit, lightning prevention 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 water shutoff 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 water shutoff 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 water shutoff agent viscosity under different water cut condition;
Fig. 2 is the reservoir core plugging curve of multiviscosisty thin oil water shutoff agent;
Fig. 3 is multiviscosisty thin oil water shutoff agent Crude Oil rate of extraction curve;
Fig. 4 is the schematic diagram for oil well thin oil multiviscosisty water shutoff agent injection control system;
Fig. 5 is the circuit diagram of the lightning-proof protection circuit for oil well thin oil multiviscosisty water shutoff agent injection control system.
Embodiment
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 range of the present utility model only should be limited to following concrete structure or parts or design parameter.
One of the present utility model is used for oil well multiviscosisty thin oil water shutoff agent and preparation method thereof, and it is that one is applicable to water flooding later stage oil well multiviscosisty thin oil system.The multiviscosisty thin oil water shutoff agent that the utility model provides have injection process viscosity low, in oil reservoir with the feature of the quick thickening of formation water emulsification, selective shut-off high permeability zone can be realized in oil well, obviously improve oil well liquid-producing section.
The purpose of this utility model is also the Detailed composition providing above-mentioned oil well multiviscosisty thin oil water shutoff agent, water shutoff 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 90%-95%, thickening agent composition accounts for 2%-8%, and auxiliary agent composition accounts for 2%-3%.Preferably, be made up of for oil well thin oil multiviscosisty water shutoff agent the thin oil composition that dewaters, thickening agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 92%-94%, and thickening agent composition accounts for 4%-7%, and auxiliary agent composition accounts for 2%-2.5%.More preferably, be made up of for oil well thin oil multiviscosisty water shutoff agent the thin oil composition that dewaters, thickening agent composition and auxiliary agent composition, wherein calculate with weight ratio, dehydration thin oil composition accounts for 95%, and thickening agent composition accounts for 4.0%, and auxiliary agent composition accounts for 1.0%.
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 oil well multiviscosisty thin oil water shutoff agent, and this water shutoff agent is made up of the thin oil that dewaters, thickening agent and auxiliary agent, and three mixes on ground and obtains above-mentioned water shutoff agent.According to concrete technical scheme of the present utility model, the above-mentioned preparation method being applicable to oil well multiviscosisty thin oil water shutoff 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 water shutoff 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 water shutoff agent in above-mentioned dewatered oil.
Be 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 for oil well thin oil multiviscosisty water shutoff agent injection control system (dispensing control system part wherein as shown in Figure 4),, control system part as shown in Figure 4 comprises programmable control system, electromagnetic flowmeter, feeding screw, frequency converter, measuring pump and electric control valve.High-pressure water inlet pipeline has installed hand stop valve, electric control valve, electromagnetic flowmeter and ejector successively, High-Pressure Water through ejector time, crosslinking agent liquid or polymer dry powder can suck in water lines by the negative pressure of generation, add in profile control agent tank.In profile control agent tank, blender is installed, can makes fully to mix into water and medicament.When in tank, liquid level reaches preset value, automatic program is out of service, and valve with electrically motorized operation cuts out automatically, and profile control agent automatic preparation completes.Stuff level switch installed by the polymer storage tank of auxiliary agent feed arrangement, and discharge outlet installs blanking switch and feeding screw, and during feed, polymer falls into hopper, and it is equipped with stuff level switch, and is connected with the ejector on inlet pipeline by flexible pipe.The drive motors of feeding screw, frequency converter and stuff level switch place are wired to control cabinet.Thickening agent feed arrangement has installed liquid-level switch on crosslinking agent storage tank, in exit, hand-operated valve is housed, and is connected to measuring pump subsequently.During charging, crosslinking agent falls into hopper, and hopper is connected with the ejector on inlet pipeline by flexible pipe.Measuring pump and liquid-level switch place are wired to control cabinet.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, feeding screw and dry powder hopper.The stuff level switch 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 on flexible pipe and inlet pipeline by hopper.Thickening agent feed arrangement is made up of crosslinking agent storage tank, measuring pump and crosslinking agent hopper.Liquid-level switch 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, and crosslinking agent is sucked under suction function by the ejector on flexible pipe and inlet pipeline by hopper.
In addition; often use in the wild for oil well thin oil multiviscosisty water shutoff agent injection control system; often be subject to (nature) thunderbolt and damage; lightning prevention circuit is had in the utility model Yu for oil well thin oil multiviscosisty water shutoff 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 oil well thin oil multiviscosisty water shutoff 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 operation 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 puncture 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: insulation 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 circuit element 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, puncture 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, induction 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 operating 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.
Following table is that thin oil multiviscosisty water shutoff agent and viscoelastic gel class water shutoff agent performance parameter contrast;
| Performance parameter | Multiviscosisty thin oil profile control agent | Viscoplasticity Weak Gels class profile control agent |
| Viscosity, mPa.s | 9435 | 5255 |
| Thermal stability, d | 32 | 13 |
| Shutoff efficiency, % | 99.1 | 86.2 |
| Improve oil displacement efficiency, % | 21.5 | 9.4 |
| The rate of extraction, % | 84.8 | 5.1 |
Below by embodiment, the utility model is further described.
Embodiment 1: multiviscosisty thin oil water shutoff agent is prepared
Preparation experiment simulated formation water, the ion concentration of preparation water is in table 1.Take dehydration thin oil 190g, be placed in 1000ml beaker, add 8..0g thickening agent, 2..0g auxiliary agent in beaker successively, carry out stirring 1 hour with blender, obtained multiviscosisty thin oil blocks up water flooding 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 water shutoff agent in embodiment 1, respectively to adding stratum Simulated Water in profile control agent, make multiviscosisty thin oil water shutoff 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 water shutoff agent.As shown in Figure 1, along with moisture content raises in water shutoff agent, viscosity obviously increases experimental result, rises to 21000mPa.s by initial 30mPa.s.Show that this water shutoff agent constantly contacts along with formation water after injecting stratum, water shutoff agent is moisture to be raised gradually, and viscosity increases fast, forms shutoff, improve oil well liquid-producing section to Thief zone water-yielding stratum.
Embodiment 4: the reservoir core plugging feature of thin oil multiviscosisty water shutoff agent
According to the method preparation thin oil multiviscosisty water shutoff agent in embodiment 1, in 50 DEG C of insulating boxs, to inject the water shutoff 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 pore 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 thin oil multiviscosisty water shutoff agent as shown in Figure 2.Before water blockoff, the porosity of one dimension sand-filling tube model is 30.2%, and permeability is 1.094 μm
2, injecting moisture after water shutoff agent be the permeability of the one dimension sand-filling tube model of 100% is 0.016 μm
2, the sealing ratiod of water shutoff agent is 98.5%; Moisture be the permeability of the one dimension sand-filling tube model of 5% is 0.925 μm
2, after injection water shutoff agent, permeability is 0.890 μm
2, sealing ratiod is 3.8%, illustrates that the high permeability zone that multiviscosisty thin oil water shutoff agent of the present utility model is higher to moisture content has stronger shut-off capacity, suppresses high permeability formation strong water outlet, simultaneously to less permeable layer without contaminations such as shutoff, obviously improve oil well liquid-producing section.
Embodiment 5: the thin oil multiviscosisty water shutoff agent Crude Oil rate of extraction
According to the method preparation thin oil multiviscosisty water shutoff agent in embodiment 1, in 50 DEG C of insulating boxs, to inject the water shutoff 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 pore 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.Thin oil multiviscosisty water shutoff agent crude oil rate of extraction curve as shown in Figure 3.One dimension sand-filling tube model porosity is 29.8%, before injection water shutoff agent, saturated crude oil volume is 40.2ml, and the crude oil volume that water drive terminates rear extraction is 31.6ml, and the crude oil rate of extraction is 85.6%, show that in water shutoff agent, most of crude oil still can be gone out by back production, significantly reduces experimentation cost.
Embodiment 5: thin oil multiviscosisty water shutoff agent and viscoelastic gel class water shutoff agent performance parameter contrast
According to the method preparing thin oil multiviscosisty water shutoff agent in embodiment 1, prepare moisture be 70% thin oil multiviscosisty water shutoff agent, under 80 DEG C of conditions, carry out viscosity, thermal stability, shutoff efficiency with viscoelastic gel class water shutoff agent, improve the performance parameter such as oil displacement efficiency, the rate of extraction and contrast, as shown in table 1, thin oil multiviscosisty water shutoff agent serviceability of the present utility model is obviously better than viscoelastic gel class water shutoff agent, can increase substantially oil displacement efficiency.
The above; be only the utility model preferably embodiment; but protection range 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 range 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 (4)
1. one kind for oil well thin oil multiviscosisty water shutoff agent injection control system, it is characterized in that, it comprises lightning prevention circuit, lightning prevention 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, 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.
2. for oil well thin oil multiviscosisty water shutoff 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. for oil well thin oil multiviscosisty water shutoff 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 according to according to claim 1, and wherein the G of gas discharge tube Q2 holds ground connection.
4. according to described in claim 1 or 2 for oil well thin oil multiviscosisty water shutoff 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 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.
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| CN201520146170.0U CN204633327U (en) | 2015-03-14 | 2015-03-14 | A kind of for oil well thin oil multiviscosisty water shutoff agent injection control system |
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Granted publication date: 20150909 Termination date: 20190314 |