Metering device for oil well production

Abstract

The present application relates to oil well production metering technical field, it is a kind of oil well production metering device, it includes hollow separation tank and control unit, separation tank upper left side is equipped with liquid inlet, liquid inlet is fixedly installed with liquid inlet pipe, separation tank lower end middle part is equipped with liquid outlet, liquid outlet is fixedly installed with liquid discharge pipe.The present application is reasonable and compact, convenient to use, it realizes gas-liquid separation and mixing of oil well gas-liquid mixture by separation tank with two cavities, realizes the measurement of water content in oil well production liquid and the calculation of gas production and oil well production liquid volume by setting gas production detection part, liquid production and moisture estimation part, liquid production precision measurement part and control unit between the two cavities, high degree of automation, greatly reduces the labor intensity of artificial participation and detection personnel, and the compatibility of the existing automatic system in oil field is good, detection cost is low, the measurement precision is stable, there is no shrinkage on the measurement pipeline, and the safety hazard is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil well production metering, and is an oil well production metering device. BACKGROUND

[0002] The oil pumping well system mainly consists of three parts of an oil pumping unit, an oil pumping rod and an oil pumping pump. The pumping unit suspension point reciprocates under the driving of the motor, and transmits the ground power to the downhole pump through the oil pumping rod to drive the downhole plunger pump to pump oil. The fixed valve is located at the upper part of the pump barrel, and the movable valve is located inside the plunger. In the up-and-down stroke, the crude oil is lifted to the ground with the opening and closing of the movable valve and the fixed valve.

[0003] In the process of oil exploitation, the ground oil extraction equipment, such as the oil pumping unit, draws the mixed liquid of oil, gas and water from the formation and transports it through the ground pipeline, for example, to the oil storage tank. In order to ensure the safety of transportation, it is necessary to measure various parameters, such as the pressure, temperature and flow rate of the mixed liquid at the wellhead; in order to understand the production of the oil well, a metering device needs to be installed for metering.

[0004] In the prior art, various instruments are generally installed to measure corresponding parameters, for example, a pressure sensor is connected through a hole in the ground pipeline to measure the pressure of the liquid in the ground pipeline on the pipeline; a thermocouple or a patch type temperature sensor is used to obtain temperature data; a flow meter is used to measure the flow rate in the ground pipeline.

[0005] In the metering of production, a vortex flow meter, an ultrasonic flow meter, a metal float flow meter and the like are usually installed in the pipeline, and the production of the oil well is obtained by converting the measured flow rate; or a weighing metering device of the oil well is used to calculate the production of the oil well by using a weighing sensor and the number of times of turning over of a hopper; or an oil well dynamometer card is collected to calculate the production of the oil well according to the oil well dynamometer card.

[0006] Therefore, the oil well production metering device commonly used in the existing oil field has the following disadvantages in actual use: low degree of automation, high labor intensity of detection personnel; high detection cost of mass flow meters, safety hazards of metering pipeline reduction, and unstable metering accuracy. SUMMARY

[0007] The present application provides an oil well production metering device, which overcomes the above-mentioned deficiencies of the prior art, and effectively solves the problems of low degree of automation, unstable accuracy, high detection cost and safety hazards of the oil well production metering device commonly used in the existing oil field in actual use.

[0008] The technical scheme of the present application is realized by the following measures: an oil well production metering device, comprising a hollow separation tank and a control unit, a liquid inlet is arranged on the upper left side of the separation tank, a liquid inlet pipe is fixedly installed in the liquid inlet, a liquid outlet is arranged on the lower end of the separation tank, and a liquid outlet pipe is fixedly installed in the liquid outlet; a partition plate is fixedly installed on the inner side of the middle part of the separation tank, the partition plate divides the separation tank into an upper cavity and a lower cavity, a gas production amount detection part capable of detecting the gas production amount of the oil well is arranged between the upper end middle part of the upper cavity and the upper right side of the upper part of the lower cavity, a liquid production amount and moisture estimation part capable of preliminarily estimating the liquid production amount of the oil well is arranged between the left side of the middle part of the upper cavity and the left side of the upper part of the lower cavity, and the control unit is electrically connected with the gas production amount detection part and the liquid production amount and moisture estimation part.

[0009] The following is a further optimization or / and improvement of the above-mentioned technical scheme of the application:

[0010] The liquid production amount and moisture estimation part can include an oil inlet pipe, a water content analyzer, an inverted U-shaped siphon pipe, and a liquid production amount estimation unit, an oil inlet is arranged on the left side of the separation tank corresponding to the position of the upper part of the lower cavity, an oil inlet pipe with a blind left end is fixedly installed in the oil inlet, a water content analyzer is arranged on the left end of the oil inlet pipe, a liquid passing hole for internal and external communication is arranged on the upper side of the left part of the oil inlet pipe, an oil outlet is arranged on the left side of the separation tank corresponding to the position of the middle part of the upper cavity, an inverted U-shaped siphon pipe with the left upper part of the inverted U-shaped siphon pipe fixedly installed together with the inside of the liquid passing hole is fixedly installed in the oil outlet, the right lower end of the inverted U-shaped siphon pipe is located in the upper cavity, a liquid production amount estimation unit capable of detecting the number of siphon phenomena and the duration time per unit time is arranged on the left upper part of the inverted U-shaped siphon pipe, and the water content analyzer and the liquid production amount estimation unit are electrically connected with the control unit.

[0011] The liquid production amount estimation unit can be a capacitive liquid level sensor.

[0012] The gas production amount detection part can include a communication pipe and a natural gas flow measuring instrument, a gas outlet is arranged on the upper end middle part of the separation tank, an air inlet is arranged on the right side of the separation tank corresponding to the position of the upper part of the lower cavity, a communication pipe is fixedly installed between the air inlet and the gas outlet, a natural gas flow measuring instrument is arranged on the communication pipe, and the natural gas flow measuring instrument is electrically connected with the control unit.

[0013] The upper part of the separation tank and the upper part of the communication pipe can be provided with a liquid production amount fine measurement part capable of accurately detecting the liquid production amount, and the liquid production amount fine measurement part can include a liquid level communicator, a detection pipe, a first liquid level sensor and a second liquid level sensor, the middle part of the baffle is provided with a measuring hole penetrating through the upper and lower parts, the measuring hole is fixedly installed with the liquid level communicator, the separation tank is provided with a detection hole penetrating through the inner and outer parts at the position corresponding to the lower end of the liquid level communicator, the lower end of the liquid level communicator is fixedly installed with the detection pipe, the other end of the detection pipe is communicated with the lower side of the upper part of the communication pipe after penetrating through the detection hole and is fixedly installed together, the detection pipe is provided with the first liquid level sensor and the second liquid level sensor at the positions corresponding to the lower right end of the inverted U-shaped siphon pipe and the curved part at the upper end thereof respectively, and the first liquid level sensor and the second liquid level sensor are electrically connected with the control unit respectively.

[0014] The liquid production amount fine measurement part can further include a water injection pipe and a water injection control valve, and the upper part of the detection pipe is provided with a water injection port penetrating through the inner and outer parts, the water injection port is fixedly installed with an L-shaped water injection pipe with a funnel-shaped upper end, and the horizontal part of the water injection pipe is provided with the water injection control valve.

[0015] The right end of the liquid inlet pipe and the right end of the oil inlet pipe can be curved into an arc shape downward.

[0016] The liquid inlet pipe can be an expansion pipe with a left thin and right thick shape.

[0017] The natural gas flow measuring instrument can accurately measure the flow of natural gas per unit time in the process of flowing from the upper cavity into the lower cavity through the communication pipe, the water content and flow of the oil-water mixture can be estimated and measured by the water content analyzer and the liquid production amount estimation unit respectively in the process of flowing from the upper cavity into the lower cavity through the inverted U-shaped siphon pipe and the oil inlet pipe, and the oil-water mixture can be further accurately measured by the first liquid level sensor and the second liquid level sensor; the control unit can directly obtain or automatically calculate the water content, the liquid production amount and the gas production amount of the oil well through the measurement data, has high automation degree, can realize remote transmission and control through a network, has good compatibility with the existing automatic system of the oil field, greatly reduces the labor intensity of the detection personnel and the labor participation degree, has low detection cost, stable measurement accuracy, no diameter reduction on the measurement pipeline, and avoids safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0018] ATTACHMENT Figure 1 FIG. 1 is a schematic structural diagram of a front view of an embodiment of the application.

[0019] The codes in the attached diagram are as follows: 1 is the separator, 2 is the inlet pipe, 3 is the outlet pipe, 4 is the baffle, 5 is the upper cavity, 6 is the lower cavity, 7 is the oil inlet pipe, 8 is the water content analyzer, 9 is the inverted U-shaped siphon, 10 is the production volume estimation unit, 11 is the connecting pipe, 12 is the natural gas flow meter, 13 is the liquid level connector, 14 is the detection pipe, 15 is the first liquid level sensor, 16 is the second liquid level sensor, 17 is the water injection pipe, and 18 is the water injection control valve. Detailed Implementation

[0020] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0021] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0022] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0023] Example 1: As shown in the attached document Figure 1 As shown, the oil well production metering device includes a hollow separation tank 1 and a control unit. The upper left side of the separation tank 1 has an inlet, and an inlet pipe 2 is fixedly installed inside the inlet. The lower middle part of the separation tank 1 has an outlet, and a drain pipe 3 is fixedly installed inside the outlet. A partition 4 is fixedly installed on the inner side of the middle part of the separation tank 1, which divides the separation tank 1 into an upper cavity 5 and a lower cavity 6. A gas production detection unit that can detect the gas production of the oil well is located between the upper middle part of the upper cavity 5 and the upper right side of the lower cavity 6. A liquid production and moisture estimation unit that can preliminarily estimate the liquid production of the oil well is located between the middle left side of the upper cavity 5 and the upper left side of the lower cavity 6. The control unit is electrically connected to the gas production detection unit and the liquid production and moisture estimation unit, respectively.

[0024] By setting in this way, the gas-liquid mixture produced by the oil well flows into the upper cavity 5 through the liquid inlet pipe 2 for gas-liquid separation, and the separated gas flows into the lower cavity 6 from the middle of the upper end of the upper cavity 5 through the gas production rate detection part, the gas production rate detection part uploads the measured natural gas flow value to the control unit, and the control unit can calculate the natural gas production rate of the oil well according to the instantaneous flow value or the cumulative flow value, and further draw the natural gas production rate map of the oil well; in the process of the separated oil-water mixture flowing from the upper cavity 5 to the lower cavity 6 through the liquid production rate and moisture estimation part, the liquid production rate and moisture estimation part uploads the measured water content in the oil-water mixture and the flow value of the oil-water mixture per unit time to the control unit, and the control unit can preliminarily estimate the liquid production rate of the oil well through the flow value of the oil-water mixture, and further draw the water content and liquid production rate map of the oil well, and can also cooperate with the storage, printer and network to store, print, remotely transmit and control the above measurement results; the gas-liquid mixture recombined in the lower cavity 6 can be transported to the designated position through the liquid outlet pipe 3.

[0025] According to the needs, the separation tank 1 with the upper and lower two cavities can also be realized by two tank bodies; the gas production rate detection part can be realized by a natural gas flow meter or a natural gas flow meter installed on the pipeline; the liquid production rate and moisture estimation part can be realized by an oil water content analyzer or an online crude oil water content analyzer or an oil water content sensor or an online crude oil water content detector and a liquid flow sensor or a liquid level sensor or a floating ball type liquid level transmitter; the control unit can be realized by a PLC or a single-chip microcomputer or a computer in the prior art, and can also be realized by a distributed computer control unit (DCS); in addition, the present application can also be provided with a temperature sensor inside / outside the upper cavity 5 to monitor the temperature of the gas-liquid mixture.

[0026] The present application has reasonable and compact structure, and is convenient to use, which realizes the gas-liquid separation and mixing of the gas-liquid mixture of the oil well through the separation tank 1 with the upper and lower two cavities, realizes the measurement of the gas production rate and water content in the produced liquid of the oil well and the preliminary estimation of the liquid production rate of the oil well through the gas production rate detection part, the liquid production rate and moisture estimation part and the control unit arranged between the upper and lower two cavities, has high automation degree, greatly reduces the labor intensity of the detection personnel and the labor participation degree, has good compatibility with the existing automatic system of the oil field, has low detection cost, stable measurement accuracy, no reduction on the measurement pipeline, and avoids safety hazards.

[0027] According to the actual needs, the above-mentioned oil production metering device can be further optimized or / and improved:

[0028] Example 2: as shown in the attached Figure 1As shown, the liquid production and moisture estimation unit includes an oil inlet pipe 7, a water content analyzer 8, an inverted U-shaped siphon 9, and a liquid production estimation unit 10. An oil inlet is arranged on the left side of the separation tank 1 at the upper position of the lower cavity 6. The oil inlet is fixedly installed with the oil inlet pipe 7 with a blind left end. The left end of the oil inlet pipe 7 is provided with the water content analyzer 8. The left part of the oil inlet pipe 7 is provided with a liquid passage hole connected with the inside and outside. An oil outlet is arranged on the left side of the separation tank 1 at the middle position of the upper cavity 5. The oil outlet is fixedly installed with the inverted U-shaped siphon 9 with the left lower end fixedly installed with the liquid passage hole on the inside. The right lower end of the inverted U-shaped siphon 9 is located in the upper cavity 5. The left upper part of the inverted U-shaped siphon 9 is provided with the liquid production estimation unit 10 capable of detecting the number of siphon phenomena and the duration in a unit time. The water content analyzer 8 and the liquid production estimation unit 10 are electrically connected with the control unit.

[0029] In use, the gas-liquid mixture produced by the oil well is separated into oil-water mixture. When the liquid surface of the oil-water mixture in the upper cavity 5 is higher than the bending part of the upper end of the inverted U-shaped siphon 9, the siphon phenomenon occurs. The siphon effect can make the oil-water mixture in the upper cavity 5 flow into the lower cavity 6 through the outlet of the left lower end of the inverted U-shaped siphon 9 and the oil inlet pipe 7. When the liquid surface of the oil-water mixture in the upper cavity 5 is lower than the inlet of the right lower end of the inverted U-shaped siphon 9, the siphon phenomenon in the inverted U-shaped siphon 9 stops, that is, the oil-water mixture stops flowing in the inverted U-shaped siphon 9. The oil-water mixture re-converges at the bottom of the upper cavity 5, and the cycle is repeated. In this process, the liquid production estimation unit 10 measures the number of siphon phenomena and the duration in a unit time. The control unit can preliminarily estimate the liquid production of the oil well according to the measurement values. The water content analyzer 8 can obtain the water content of the produced liquid of the oil well by measuring the moisture of the oil-water mixture in the inverted U-shaped siphon 9. According to the requirements, the oil inlet pipe 7 with the blind left end in this embodiment can be realized by the J-shaped pipe and the blind flange connected to the left end of the J-shaped pipe in the prior art. The liquid production estimation unit 10 can be realized by the float type liquid level sensor or the floating ball type liquid level sensor or the static pressure type liquid level sensor in the prior art. The water content analyzer 8 can be realized by the Universal IV UCM series online water content analyzer in oil in the DREXELBROOK in the prior art.

[0030] Embodiment 3: as shown in the accompanying Figure 1 The liquid production estimation unit 10 is a capacitive liquid level sensor. This arrangement is mainly because the capacitive liquid level sensor has the advantages of large dynamic range, fast response speed, small zero drift, simple structure, and strong adaptability.

[0031] Embodiment 4: as shown in the accompanying Figure 1As shown, the gas production detection part includes the communication pipe 11 and the natural gas flow measuring instrument 12, the upper end of the middle of the separation tank 1 is provided with a gas outlet, the right side of the separation tank 1 corresponding to the upper position of the lower cavity 6 is provided with a gas inlet, the communication pipe 11 is fixedly installed between the gas inlet and the gas outlet, the natural gas flow measuring instrument 12 is arranged on the communication pipe 11, and the natural gas flow measuring instrument 12 is electrically connected with the control unit.

[0032] Through such an arrangement, after the oil well gas-liquid mixture is separated in the upper cavity 5, the natural gas floats out from the upper end of the separation tank 1 and flows into the lower cavity 6 from the communication pipe 11, and the natural gas flow through the communication pipe 11 can be measured by the natural gas flow measuring instrument 12. The natural gas flow measuring instrument 12 in the prior art can usually accurately and stably measure the instantaneous flow value and the cumulative flow value of the natural gas, and the control unit can quickly and accurately calculate the gas production of the oil well according to the natural gas flow value in a unit time. According to the need, the natural gas flow measuring instrument 12 can be realized by the digital natural gas turbine flow sensor in the prior art.

[0033] Embodiment 5: as shown in the accompanying Figure 1 As shown, the separation tank 1 is provided with a liquid production precision measurement part capable of accurately detecting the liquid production between the middle and the upper part of the communication pipe 11, the liquid production precision measurement part includes a liquid level communicator 13, a detection pipe 14, a first liquid level sensor 15 and a second liquid level sensor 16, the middle of the partition plate 4 is provided with a measuring hole penetrating upward and downward, the measuring hole is fixedly installed with the liquid level communicator 13, the upper part of the separation tank 1 corresponding to the lower end position of the liquid level communicator 13 is provided with a detection hole penetrating inside and outside, the lower end of the liquid level communicator 13 is fixedly installed with the detection pipe 14, the other end of the detection pipe 14 penetrates through the detection hole and is in communication with and fixedly installed with the upper part of the lower side of the communication pipe 11, the first liquid level sensor 15 and the second liquid level sensor 16 are respectively arranged on the detection pipe 14 corresponding to the right lower end of the inverted U-shaped siphon pipe 9 and the upper end bending part thereof, and the first liquid level sensor 15 and the second liquid level sensor 16 are respectively electrically connected with the control unit.

[0034] During use, the oil-water mixture at the bottom of the upper cavity 5 can enter the detection tube 14 through the liquid level communicator 13, and when the first liquid level sensor 15 detects the liquid level, the liquid level of the oil-water mixture in the upper cavity 5 is just level with the inlet position at the lower right end of the inverted U-shaped siphon 9, and when the second liquid level sensor 16 detects the liquid level, the liquid level of the oil-water mixture is just to the outlet position at the curved portion of the upper end of the inverted U-shaped siphon 9 and siphon phenomenon occurs; the control unit can accurately calculate the liquid production of the oil well according to the time difference of the liquid level data detected by the first liquid level sensor 15 and the second liquid level sensor 16, the internal cavity volume of the separation tank 1 corresponding to the lower side position of the lower right end of the inverted U-shaped siphon 9, and the internal cavity volume of the separation tank 1 corresponding to the position between the lower right end and the curved portion of the inverted U-shaped siphon 9. According to requirements, the first liquid level sensor 15 and the second liquid level sensor 16 can be realized by the contact liquid level sensor or the non-contact liquid level sensor in the prior art; the detection tube 14 and the detection hole can be directly fixed and installed together, or can be fixed and connected together through a pipe joint.

[0035] Embodiment 6: as shown in the accompanying Figure 1 The liquid production accurate measurement unit further comprises a water injection pipe 17 and a water injection control valve 18, and the upper portion of the detection tube 14 is provided with a water injection port penetrating in and out, and the water injection port is fixedly installed with an L-shaped water injection pipe 17 with a funnel-shaped upper end, and the horizontal portion of the water injection pipe 17 is provided with a water injection control valve 18.

[0036] During use, the water injection control valve 18 is opened, and then clear water can be injected into the detection tube 14 and the communicator through the L-shaped water injection pipe 17, so that the liquid level of the clear water in the detection tube 14 is below the first liquid level sensor 15, so that when the liquid level of the oil-water mixture reaches the inlet at the lower right end of the inverted U-shaped siphon 9, the oil-water mixture can push the liquid level of the clear water to reach the first liquid level sensor 15, and when the liquid level of the oil-water mixture reaches the outlet at the curved portion of the U-shaped siphon, the liquid level of the clear water is just to the second liquid level sensor 16, so that the probes of the first liquid level sensor 15 and the second sensor are always in contact with the clear water, the first liquid level sensor 15 and the second sensor are kept clean, and the probes are prevented from being corroded by the oil-water mixture.

[0037] Embodiment 7: as shown in the accompanying Figure 1 The right end of the liquid inlet pipe 2 and the right end of the oil inlet pipe 7 are both curved into an arc shape.

[0038] By such arrangement, the bending of the right end of the liquid inlet pipe 2 can make the gas-liquid mixture produced by the oil well flow into the bottom of the upper cavity 5, prevent the floating natural gas from being re-dissolved in the mixed liquid, affect the determination of the natural gas production, and avoid the splashing and wall-hanging of the gas-liquid mixture; the bending of the right end of the oil inlet pipe 7 can effectively avoid the splashing separation of the oil-water mixture, so that the oil-water mixture quickly flows out through the oil inlet pipe 7.

[0039] Embodiment 8: as shown in the accompanying Figure 1As shown, the liquid inlet pipe 2 can be a left-thin right-thick diameter expansion pipe. During use, the left-thin right-thick diameter expansion pipe can reduce the pressure of the gas-liquid mixture, so that the gas-liquid mixture is preliminarily separated, and then separated again through the upper cavity 5, so that the gas-liquid separation effect is better, and the measured value is more accurate.

[0040] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A metering device for oil well production, characterized in that The utility model provides a kind of oil well production test device, including hollow separation tank and control unit, separation tank upper left is equipped with liquid inlet, and liquid inlet is fixedly installed with liquid inlet pipe, separation tank lower end middle part is equipped with liquid outlet, and liquid outlet is fixedly installed with liquid outlet pipe;Separation tank middle part inboard is fixedly installed with baffle, baffle separates into upper cavity and lower cavity, and upper cavity upper end middle part and lower cavity upper right between are equipped with gas production detection part that can detect oil well gas production, and upper cavity middle part left and lower cavity upper left between are equipped with liquid production and moisture estimation part that can preliminary estimate oil well liquid production, and control unit is electrically connected with gas production detection part and liquid production and moisture estimation part respectively; Liquid production and moisture estimation part includes oil inlet pipe, water content analyzer, inverted U-shaped siphon and liquid production estimation unit, and the left side of the separation tank corresponding to the position of the upper part of the lower cavity is provided with an oil inlet, and the oil inlet is fixedly installed with an oil inlet pipe with a blind end at the left end, the water content analyzer is arranged at the left end of the oil inlet pipe, and the left part of the oil inlet pipe is provided with a liquid passage hole connected internally and externally, and the left side of the separation tank corresponding to the position of the middle part of the upper cavity is provided with an oil outlet, and the oil outlet is fixedly installed with an inverted U-shaped siphon with the left lower end outside and the liquid passage hole inside fixedly installed together, the right lower end of the inverted U-shaped siphon is located in the upper cavity, and the left upper part of the inverted U-shaped siphon is provided with a liquid production estimation unit capable of detecting the number of siphon phenomena and the duration time in a unit time, and the water content analyzer and the liquid production estimation unit are electrically connected with the control unit respectively; The gas production detection part includes a communication pipe and a natural gas flow measuring instrument, the upper middle part of the separation tank is provided with a gas outlet, the right side of the separation tank corresponding to the position of the upper part of the lower cavity is provided with a gas inlet, the communication pipe is fixedly installed between the gas inlet and the gas outlet, the natural gas flow measuring instrument is arranged on the communication pipe, and the natural gas flow measuring instrument is electrically connected with the control unit; The middle part of the separation tank and the upper part of the communication pipe are provided with a liquid production accurate measurement part capable of accurately detecting the liquid production, the liquid production accurate measurement part includes a liquid level communicator, a detection pipe, a first liquid level sensor and a second liquid level sensor, the middle part of the baffle is provided with a measuring hole penetrating up and down, the measuring hole is fixedly installed with the liquid level communicator, the separation tank is provided with a detection hole penetrating internally and externally corresponding to the position of the lower end of the liquid level communicator, the lower end of the liquid level communicator is fixedly installed with the detection pipe, the other end of the detection pipe is communicated with and fixedly installed with the upper part of the communication pipe after penetrating through the detection hole, the first liquid level sensor and the second liquid level sensor are respectively arranged on the detection pipe corresponding to the right lower end of the inverted U-shaped siphon and the upper end curved part of the inverted U-shaped siphon, and the first liquid level sensor and the second liquid level sensor are respectively electrically connected with the control unit;When the first liquid level sensor detects the liquid surface, the oil-water mixture liquid surface in the upper cavity is just flush with the inlet position of the right lower end of the inverted U-shaped siphon, and when the second liquid level sensor detects the liquid surface, the liquid surface of the oil-water mixture reaches the outlet position of the upper end curved part of the inverted U-shaped siphon and siphon phenomenon occurs.

2. The oil well production metering device of claim 1, wherein, The liquid production estimation unit is a capacitive liquid level sensor.

3. A device for metering the production of an oil well according to claim 1 or 2, characterised in that The liquid production accurate measurement part further includes a water injection pipe and a water injection control valve, the upper part of the detection pipe is provided with a water injection hole penetrating internally and externally, the water injection hole is fixedly installed with an L-shaped water injection pipe with a funnel-shaped upper end, and the water injection control valve is arranged on the horizontal part of the water injection pipe.

4. The oil well production metering device of claim 1 or 2, wherein, The right end of the liquid inlet pipe and the right end of the oil inlet pipe are both curved into an arc shape downward.

5. The oil well production metering device of claim 1 or 2, wherein, The inlet pipe is a left-thin right-thick diameter expansion pipe.

6. The oil well production metering device of claim 3, wherein, The inlet pipe is a left-thin right-thick diameter expansion pipe.

7. The oil well production metering device of claim 4, wherein The inlet pipe is a left-thin right-thick diameter expansion pipe.

Images