CN111256767A - Precise water injection flow meter for oil field water injection well - Google Patents
Precise water injection flow meter for oil field water injection well Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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Abstract
The invention discloses a precise water injection flowmeter for an oil field water injection well, which is used for realizing precise water injection and flow data acquisition. This flowmeter includes sensor and converter, the sensor is including surveying buret, a pair of excitation coil and a pair of electrode, the converter includes signal processing module, communication acquisition module and power module, signal processing module includes digital frequency division circuit unit and signal processing circuit unit, power module includes power conversion circuit and push-pull amplifier, signal processing circuit unit is including the amplifier circuit, the sample hold circuit, follow comparison circuit and the trigger that establish ties in proper order. The precise electromagnetic injection flowmeter for the water injection well of the oil field has the advantages of high precision, real-time communication, low cost and the like.
Description
Technical Field
The invention relates to the technical field of flowmeters, in particular to a precise water injection flowmeter for an oil field water injection well.
Background
In China, the petrochemical industry is one of the prop industries of national economy, so that the method has important guiding significance for accurately and timely measuring the yield of an oil well, mastering the oil reservoir condition and making a production scheme. From the perspective of energy conservation or economy, the accurate measurement and control of the water injection flow of the water injection well in the oil field are necessary, water is more wasted, oil is less added and cannot be pumped, and all indexes of water injection can meet the requirements only through accurate measurement and stable operation of a flowmeter, so that efficient, timely and accurate service is provided, and the smooth production of crude oil in the whole oil field is guaranteed. Therefore, in flow monitoring and flow control, it is necessary to use high-precision flow meters and control instruments, and the economic benefits are very large and obvious.
At present, two types of flowmeters, namely a turbine flowmeter and a vortex street flowmeter, which are widely applied to oil fields have many defects: 1. the turbine flowmeter cannot maintain the calibration characteristic for a long time and the fluid physical property has great influence on the flow characteristic; 2. the pressure loss of the vortex street flowmeter is small compared with that of a turbine flowmeter, but the pressure loss exists, the energy-saving effect is poor, and the requirement of a longer straight pipe section on field installation is higher. 3. The two flowmeters of turbine and vortex street are only suitable for ground application and can not be used for well testing. Therefore, an electromagnetic flowmeter specially used for an oil field water injection well needs to be researched, and the electromagnetic flowmeter not only needs to have high precision, customizable appearance and real-time communication, but also needs to reduce the cost.
Disclosure of Invention
The embodiment of the invention aims to provide a precise water injection flow meter for an oil field water injection well, which is used for realizing precise water injection and flow data acquisition.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions.
A precise water injection flowmeter for an oil field water injection well comprises a sensor and a converter, wherein the sensor comprises a measuring pipe, a pair of magnet exciting coils and a pair of electrodes, the converter comprises a signal processing module, a communication acquisition module and a power supply module, the signal processing module comprises a digital frequency division circuit unit and a signal processing circuit unit, the power supply module comprises a power supply conversion circuit and a push-pull amplifier, and the signal processing circuit unit comprises an amplifying circuit, a sampling holding circuit, a following comparison circuit and a trigger which are sequentially connected in series;
the power supply conversion circuit is used for providing power supply for the push-pull amplifier and the communication acquisition module;
the digital frequency division circuit unit is used for generating an excitation signal according to a reference signal and outputting the excitation signal to the push-pull amplifier, generating a clock signal and outputting the clock signal to the trigger, wherein the excitation signal is two paths of 6Hz square wave signals with a phase difference of 180 degrees, the clock signal is a 3.125KHz square wave signal, and the digital frequency division circuit unit is also used for generating a control signal according to the excitation signal and outputting the control signal to the sample-hold circuit;
the push-pull amplifier is used for generating an excitation driving signal according to the excitation signal and applying the excitation driving signal to the excitation coil;
the signal processing circuit unit is used for processing the induction signals generated by the electrodes and outputting pulse signals with duty ratios changing along with flow to the communication acquisition module.
According to the technical scheme, the embodiment of the invention has the following technical effects:
the precise electromagnetic injection flowmeter for the water injection well of the oil field has the advantages of high precision, real-time communication, low cost and the like.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below.
FIG. 1 is a hardware block diagram of a flow meter in one embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a flow meter in one embodiment of the invention;
FIG. 3 is a block diagram of the overall structure of the electronics of the flow meter in one embodiment of the invention;
FIG. 4 is a schematic diagram of a power module according to an embodiment of the invention;
FIG. 5 is a schematic diagram of the structure of the field coil generating the magnetic field in one embodiment of the present invention;
FIG. 6 is a schematic diagram of the signal processing module of the flow meter in one embodiment of the invention;
fig. 7 is a schematic structural diagram of a communication acquisition module in an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following are detailed descriptions of the respective embodiments.
Referring to fig. 1 and 2, an embodiment of the present invention provides a precision water injection flow meter (hereinafter referred to as a flow meter) for an oil field water injection well. The precise water flow meter is an electromagnetic flow meter and comprises a sensor and a converter, wherein the sensor comprises a measuring pipe, a pair of magnet exciting coils and a pair of electrodes, the converter comprises a signal processing module, a communication acquisition module and a power supply module, the signal processing module comprises a digital frequency division circuit unit and a signal processing circuit unit, the power supply module comprises a power supply conversion circuit and a push-pull amplifier, and the signal processing circuit unit comprises an amplifying circuit, a sampling holding circuit, a following comparison circuit and a trigger which are sequentially connected in series;
the power supply conversion circuit is used for providing power supply for the push-pull amplifier and the communication acquisition module;
the digital frequency division circuit unit is used for generating an excitation signal according to a reference signal and outputting the excitation signal to the push-pull amplifier, generating a clock signal and outputting the clock signal to the trigger, wherein the excitation signal is two paths of 6Hz square wave signals with a phase difference of 180 degrees, the clock signal is a 3.125KHz square wave signal, and the digital frequency division circuit unit is also used for generating a control signal according to the excitation signal and outputting the control signal to the sample-hold circuit;
the push-pull amplifier is used for generating an excitation driving signal according to the excitation signal and applying the excitation driving signal to the excitation coil;
the signal processing circuit unit is used for processing the induction signals generated by the electrodes and outputting pulse signals with duty ratios changing along with flow to the communication acquisition module.
In one possible implementation, the signal processing circuit unit includes: the amplifying circuit is used for amplifying the induction signal generated by the electrode; the sampling hold circuit is used for carrying out sampling hold processing on the signal output by the amplifying circuit by taking the excitation signal as a control signal; the following comparison circuit is used for following and comparing the signals output by the sampling hold circuit; and the trigger is used for triggering the signal output by the following comparison circuit according to the clock signal, generating a pulse signal with the duty ratio changing along with the flow and outputting the pulse signal to the communication acquisition module.
In one possible implementation manner, the amplifying circuit includes a differential amplifying circuit, an in-phase amplifying circuit, and an inverting amplifying circuit, which are sequentially connected in series.
In a possible implementation manner, the communication acquisition module comprises a single chip microcomputer and a temperature sensor, the single chip microcomputer is used for acquiring pulse signals of which the duty ratio is changed along with the flow and output by the signal processing circuit unit, acquiring temperature signals generated by the temperature sensor and converting the acquired signals into digital signals.
In one possible implementation, the measuring tube is made of PEEK material.
In a possible implementation manner, the power conversion circuit includes a TPS7250Q chip and a TLV2252 chip, and is configured to convert an input 24V power into a 5V power, further convert the input 24V power into a 2.5V power, and generate a constant current.
In one possible implementation, the digital frequency dividing circuit unit includes:
the CD4060 chip is used for generating a 3.125KHz signal serving as a clock signal and a 12Hz signal according to a 100KHz square wave signal serving as a reference signal;
the frequency divider is composed of two CD4013 chips and used for dividing frequency according to the 12Hz signal to obtain two paths of 6Hz square wave signals with phase difference of 180 degrees as excitation signals;
and the CD4001 chip is used for generating a control signal according to the excitation signal.
In a possible implementation manner, the amplifying circuit includes a TLV2252 chip and an AD8552 chip which are connected in series, the sample-and-hold circuit employs a CD4066 chip, the following comparison circuit employs two AD8552 chips which are connected in series, and the flip-flop employs chips CD4013 and CD 4001.
In a possible implementation manner, the single chip microcomputer is a PIC16F886 single chip microcomputer, and the temperature sensor is a sensor with a model number of DS18B 20.
The following further describes the embodiments in specific application scenarios.
The embodiment adopts the following technical scheme:
hardware structure of sensor part
Fig. 1 shows a hardware configuration diagram of the flow meter. The sensor part comprises a measuring tube, a pair of excitation coils and a pair of electrodes, wherein the excitation coils and the electrodes are arranged on the wall of the measuring tube, and the converter part comprises a signal processing module, a communication acquisition module, a power supply module and the like.
An electromagnetic flow meter is a flow meter that performs flow measurement according to faraday's law of electromagnetic induction. The structure is that a pair of exciting coils are arranged in the vertical direction of the wall of the measuring tube, and a pair of detecting electrodes are arranged on the wall of the tube which is vertical to the axis of the measuring tube and the exciting coils. According to the Faraday electromagnetic induction principle, when the conductive liquid moves along the axis of the measuring tube, the conductive liquid cuts magnetic lines of force to generate induced potential, the induced potential is detected by two detection electrodes, the numerical value of the induced potential is in direct proportion to the flow velocity of the conductive liquid, the magnetic field intensity and the width of a conductor (the inner diameter of the measuring tube of the flowmeter), and then the medium flow can be obtained through operation. The induced electromotive force equation is:
wherein:
v-average flow velocity in the measurement tube cross section;
e-induced electromotive force;
k is the coefficient;
b, magnetic induction intensity;
d-inner diameter of the measuring tube.
In some embodiments, to ensure the measurement accuracy and signal stability, the following requirements are imposed on the flow meter:
measurement pipe (i.e. nipple or sensor nipple) section: the flowmeter of the embodiment of the invention is used over hundred meters underground, so the material is required to have high mechanical strength, high temperature resistance, impact resistance, flame retardance, acid and alkali resistance, hydrolysis resistance, wear resistance, fatigue resistance, irradiation resistance and good electrical property, and the PEEK material has good toughness and rigidity and has excellent fatigue resistance to alternating stress which is comparable to that of an alloy material, so the measuring pipe is preferably made of the PEEK material.
An electrode portion: the electrode material is processed by 316L stainless steel, the electrode tip is spherical, the surface is mirror polished, the tail of the electrode is embedded into a copper pin to assist signal acquisition, the required diameter is 1 mm, the protrusion is 1.5 mm, and the embedded part is larger than the diameter of the pin so as to facilitate wiring.
Electrode to excitation coil relationship: the two electrodes must be placed 180 degrees opposite (coaxial), the two groups of excitation coils must be placed 180 degrees opposite (coaxial), the electrodes and the excitation coils must be placed on the central line of the pipeline, and the central points are in the same section and are crossed.
(II) principle of electric Circuit
Fig. 2 shows a schematic circuit diagram of the flowmeter of the present invention.
The sensor 1 portion of the electromagnetic flowmeter includes a pair of excitation coils 1A, 1B and a pair of electrodes 2A, 2B. The converter circuit part comprises a signal processing module, a communication acquisition module and a power supply module, wherein the signal processing module can be divided into a signal processing circuit unit and a digital frequency division circuit unit 8, and the communication acquisition module comprises a single chip microcomputer. The circuit part applies excitation driving signals to the excitation coils 1A and 1B to enable the excitation coils to generate magnetic fields, and collects signals from the electrodes 2A and 2B to process.
The digital frequency division circuit unit 8 is configured to divide a reference signal, such as a 100KHz wave-preventing signal, into two 6Hz square wave signals (process a) with a phase difference of 180 degrees by a frequency divider of the excitation driving circuit, and output the two 6Hz square wave signals as an excitation signal to the push-pull amplifier, where the two square wave signals act on the excitation coil, so that the excitation coil generates a magnetic field, and the excitation coil operates at a voltage of 24V to enhance the magnetic field.
The signal processing circuit unit includes: the differential amplifying circuit 2, the in-phase amplifying circuit 3, the reverse-phase amplifying circuit 4, the sample-hold circuit 5, the following comparison circuit 6 and the D trigger 7 are sequentially connected in series and used for processing weak signals detected by the electrodes, and the processed signals enter a single chip microcomputer to be subjected to A/D (analog-to-digital) conversion and finally output.
(III) concrete Circuit Structure
Fig. 3 is a block diagram of the overall structure of the electronic part of the flow meter in this embodiment, including a communication acquisition module for collecting and transmitting flow data, a signal processing module for processing microvolt level signals, and a power supply module for supplying power to the whole system.
As shown in fig. 4, the schematic diagram of the power supply module of this embodiment is shown, where the module includes a power conversion circuit composed of a chip TPS7250Q and a chip TLV2252, and a power supply of the power conversion circuit is a dc power supply, and a 24V power supply is converted into 5V and 2.5V power supplies after passing through the power supply module; a push-pull amplifier is also included. One purpose of the power conversion circuit is to generate a 5V power for a 24V power through the chip TPS7250Q, and further convert the power into a 2.5V power through the chip TLV2252, which is commonly used for supplying power to functional modules other than the power module, as in process c in fig. 2; another purpose is to generate a constant current and 24V dc voltage through the chip TLV2252, providing a constant power supply to the push-pull amplifier in preparation for the next step of generating a steady magnetic field.
As shown in fig. 5, it is a schematic diagram of a magnetic field generated by an excitation coil, and a frequency divider circuit composed of two CD4013 chips in a signal processing module generates two 6Hz square wave signals with 180 degrees phase difference (process a in fig. 2), where the square wave signals are used as excitation signals to enable the excitation coil to generate a magnetic field, and act on a push-pull amplifier of a power supply module, and the excitation coil generates a constant alternating magnetic field under the action of the push-pull amplifier.
As shown in fig. 6, the schematic diagram of the signal processing module of the flow meter is composed of two parts, namely a digital frequency dividing circuit unit and a signal processing circuit unit.
1) Digital frequency division circuit unit
The functions of the digital frequency division circuit unit are realized by chips such as CD4060, CD4013(1), CD4013(2) and CD4001 in FIG. 6.
The CD4001 is a chip composed of four nor gates, and is used to realize the function of the signal processing circuit unit while realizing the function of the digital frequency dividing circuit unit, wherein one nor gate a is used to output a pulse signal whose duty ratio changes with the flow rate to the single chip microcomputer.
When the external device sends a power-on signal, the power circuit starts to work, and then the digital frequency division circuit unit divides the frequency of the square wave signal with the frequency of 100KHz by the CD4060 chip to obtain two signals, namely 3.125KHz (process b in FIG. 2) and 12Hz, respectively, wherein the 3.125KHz is used as a clock signal and is output to the chip CD 4001. The 12Hz signal is subjected to frequency division by two CD4013 chips to obtain two paths of 6Hz (process a) square wave signals with 180-degree phase difference as excitation signals, and the excitation signals are applied to a push-pull amplifier of a power supply module. The 6Hz square wave signal is also used for being output through the other two NOR gates b and c of the chip CD4001 and being output to a sampling and holding circuit as a control signal to participate in signal sampling and holding processing.
2) Signal processing circuit unit
The unit includes:
the chip TLV2252 is used for realizing the functions of a differential amplifier circuit, improving the common mode rejection ratio and amplifying differential mode signals, and also used for realizing the functions of an in-phase amplifier circuit, and can amplify in-phase by about 100 times;
the chip AD8552 realizes the function of a reverse-phase amplifying circuit, performs reverse-phase amplification to a voltage (V) level, and simultaneously raises the signal by 2.5V twice to ensure that the signal is all in an effective range;
the signal enters a sample hold circuit after being amplified and filtered in an opposite phase mode, the chip CD4066 achieves the function of the sample hold circuit, the chip CD4066 acts as a four-way analog switch, and when the input signals of the NOR gates b and c are both low level and the input signal of the chip CD4066 is high level, the switch is switched on;
the signal enters a following comparison circuit after being sampled and held, the two chips AD8552 realize the function of the following comparison circuit, follow and compare, and realize the conversion from square waves to sawtooth waves under the action of an integrating circuit;
the signal enters the trigger after being processed by the comparison circuit, the chip CD4013 realizes the function of the trigger, the chip CD4013 uses 3.125KHz obtained by frequency division of the chip CD4060 as a clock signal to carry out D trigger processing, and then the chip CD4001 NOR gate a outputs a pulse signal with the duty ratio changing along with the flow to carry out communication acquisition for the singlechip.
It is worth to be noted that, the method of grounding is adopted to process the power frequency interference: the electromagnetic flowmeter shell adopts the stainless steel design, and when the electromagnetic flowmeter is in operation, the whole device is soaked in water, so that the interference signals are eliminated by grounding.
As shown in fig. 7, which is a schematic diagram of the communication acquisition module of this embodiment, a single chip of the module may adopt a single chip of a type PIC16F886, and mainly completes acquisition of flow data, communication, and acquisition of a working environment temperature. The temperature sensor can adopt a sensor with the model number DS18B20, is used for monitoring the temperature of the working environment, ensures that the flowmeter works in a reasonable temperature range, and is also used as one of important indexes for troubleshooting.
To sum up, the embodiment of the invention discloses a precise water injection flow meter for an oil field water injection well, which has the following advantages:
1. the inner wall of the flowmeter is a section of smooth straight pipe, so that the resistance loss is reduced, the corrosion resistance, wear resistance and scaling resistance of the PEEK material are effectively improved, and the accuracy is controlled below 3% through a large number of compression tests;
2. the power frequency interference is eliminated by adopting a grounding method, the circuits are all logic circuits, and an algorithm is not needed to process signals, so that the cost is reduced;
3. the flowmeter can customize the caliber size according to different working requirements, and meet the requirements of various working environments;
4. the measuring range of the flowmeter can be adjusted as required;
5. when the measuring ranges are the same, the whole occupied space of the flowmeter is small, and the flowmeter is convenient to use, debug and install;
6. the flowmeter is provided with a matched mechanical shell, so that the field installation steps are simplified;
7. the flowmeter can realize real-time communication, and sends collected flow data and temperature data to a PC (personal computer) end for remote monitoring;
8. the flowmeter is low in maintenance cost and short in maintenance time.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A precise water injection flow meter for an oil field water injection well, comprising a sensor and a transducer, the sensor comprising a measuring tube, a pair of excitation coils and a pair of electrodes,
the converter comprises a signal processing module, a communication acquisition module and a power supply module, wherein the signal processing module comprises a digital frequency division circuit unit and a signal processing circuit unit, the power supply module comprises a power supply conversion circuit and a push-pull amplifier, and the signal processing circuit unit comprises an amplifying circuit, a sampling hold circuit, a following comparison circuit and a trigger which are sequentially connected in series;
the power supply conversion circuit is used for providing power supply for the push-pull amplifier and the communication acquisition module;
the digital frequency division circuit unit is used for generating an excitation signal according to a reference signal and outputting the excitation signal to the push-pull amplifier, generating a clock signal and outputting the clock signal to the trigger, and is also used for generating a control signal according to the excitation signal and outputting the control signal to the sampling hold circuit;
the push-pull amplifier is used for generating an excitation driving signal according to the excitation signal and applying the excitation driving signal to the excitation coil;
the signal processing circuit unit is used for processing the induction signals generated by the electrodes and outputting pulse signals with duty ratios changing along with flow to the communication acquisition module.
2. The precision water flow meter according to claim 1,
the excitation signal is two 6Hz square wave signals with the phase difference of 180 degrees, and the clock signal is a 3.125KHz square wave signal.
3. The precision water flow meter according to claim 2, wherein the signal processing circuit unit includes:
the amplifying circuit is used for amplifying the induction signal generated by the electrode;
the sampling hold circuit is used for carrying out sampling hold processing on the signal output by the amplifying circuit by taking the excitation signal as a control signal;
the following comparison circuit is used for following and comparing the signals output by the sampling hold circuit;
and the trigger is used for triggering the signal output by the following comparison circuit according to the clock signal, generating a pulse signal with the duty ratio changing along with the flow and outputting the pulse signal to the communication acquisition module.
4. The precision water flow meter according to claim 3,
the amplifying circuit comprises a differential amplifying circuit, an in-phase amplifying circuit and an anti-phase amplifying circuit which are sequentially connected in series.
5. The precision water flow meter according to claim 1,
the communication acquisition module comprises a single chip microcomputer and a temperature sensor, wherein the single chip microcomputer is used for acquiring pulse signals of which the duty ratio changes along with the flow and output by the signal processing circuit unit, acquiring temperature signals generated by the temperature sensor and converting the acquired signals into digital signals.
6. The precision water flow meter according to claim 1,
the measuring tube is made of PEEK materials.
7. The precision water flow meter according to claim 1,
the power conversion circuit comprises a TPS7250Q chip and a TLV2252 chip and is used for converting an input 24V power into a 5V power, further converting the input 24V power into a 2.5V power and generating a constant current.
8. The precision water flow meter according to claim 2,
the digital frequency division circuit unit includes:
the CD4060 chip is used for generating a 3.125KHz signal serving as a clock signal and a 12Hz signal according to a 100KHz square wave signal serving as a reference signal;
the frequency divider is composed of two CD4013 chips and used for dividing frequency according to the 12Hz signal to obtain two paths of 6Hz square wave signals with phase difference of 180 degrees as excitation signals;
and the CD4001 chip is used for generating a control signal according to the excitation signal.
9. The precision water flow meter according to claim 3,
the amplifying circuit comprises a TLV2252 chip and an AD8552 chip which are connected in series, the sampling holding circuit adopts a CD4066 chip, the following comparison circuit adopts two AD8552 chips which are connected in series, and the trigger adopts a chip CD4013 chip and a chip CD 4001.
10. The precision water flow meter according to claim 5,
the single chip microcomputer is a PIC16F886 single chip microcomputer, and the temperature sensor is a sensor with the model number of DS18B 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010186278.8A CN111256767A (en) | 2020-03-17 | 2020-03-17 | Precise water injection flow meter for oil field water injection well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010186278.8A CN111256767A (en) | 2020-03-17 | 2020-03-17 | Precise water injection flow meter for oil field water injection well |
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| CN111256767A true CN111256767A (en) | 2020-06-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410742A (en) * | 2002-10-14 | 2003-04-16 | 杭州电子工业学院 | Intelligent frequency conversion, current transform type excitation method and electromagnetic flow meter |
| CN104236645A (en) * | 2014-09-30 | 2014-12-24 | 四川泛华航空仪表电器有限公司 | Intelligent magnetic induction flux sensor |
| CN209945453U (en) * | 2019-05-09 | 2020-01-14 | 北京远东仪表有限公司 | Wide-range-ratio electromagnetic flowmeter |
| CN211401321U (en) * | 2020-03-17 | 2020-09-01 | 深圳市佳运通电子有限公司 | Precise water injection flow meter for oil field water injection well |
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- 2020-03-17 CN CN202010186278.8A patent/CN111256767A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410742A (en) * | 2002-10-14 | 2003-04-16 | 杭州电子工业学院 | Intelligent frequency conversion, current transform type excitation method and electromagnetic flow meter |
| CN104236645A (en) * | 2014-09-30 | 2014-12-24 | 四川泛华航空仪表电器有限公司 | Intelligent magnetic induction flux sensor |
| CN209945453U (en) * | 2019-05-09 | 2020-01-14 | 北京远东仪表有限公司 | Wide-range-ratio electromagnetic flowmeter |
| CN211401321U (en) * | 2020-03-17 | 2020-09-01 | 深圳市佳运通电子有限公司 | Precise water injection flow meter for oil field water injection well |
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