CN116929470A - Underground pump pumping flow metering device and metering method - Google Patents
Underground pump pumping flow metering device and metering method Download PDFInfo
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- CN116929470A CN116929470A CN202210346159.3A CN202210346159A CN116929470A CN 116929470 A CN116929470 A CN 116929470A CN 202210346159 A CN202210346159 A CN 202210346159A CN 116929470 A CN116929470 A CN 116929470A
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- 238000005086 pumping Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 226
- 239000000203 mixture Substances 0.000 claims abstract description 182
- 238000009792 diffusion process Methods 0.000 claims abstract description 33
- 230000008602 contraction Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000008398 formation water Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Classifications
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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
- G01F1/05—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 mechanical effects
- G01F1/34—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 mechanical effects by measuring pressure or differential pressure
- G01F1/36—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
-
- 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
- G01F1/05—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 mechanical effects
- G01F1/34—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 mechanical effects by measuring pressure or differential pressure
- G01F1/36—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The utility model provides a metering device and a metering method for pumping flow of an underground pump, wherein the metering device comprises a venturi tube, the venturi tube comprises a contraction section, a venturi tube and a diffusion section, a lower joint is arranged at an opening corresponding to the contraction section, and an upper joint is arranged at an opening corresponding to the diffusion section; the inside of the contraction section and the throat pipe are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the contraction section and the throat pipe when the air-water mixture passes through the venturi pipe, and/or the inside of the diffusion section and the throat pipe are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the diffusion section and the throat pipe when the air-water mixture passes through the venturi pipe; the metering device also comprises processing equipment, and the processing equipment obtains the flow of water in the total flow of the gas-water mixture through the calculation of an internal calculation program. The metering device and the metering method provided by the utility model can solve the technical problem of flow metering of water pumped by the underground pump in the prior art.
Description
Technical Field
The utility model relates to the technical field of monitoring pumping flow of an underground pump system, in particular to a device and a method for measuring water flow in total flow of a gas-water mixture pumped by an underground pump.
Background
At present, the downhole pump is widely applied in the field of petroleum production, such as an electric submersible pump, and in exploitation of oil wells and gas wells, the electric submersible pump is used as a downhole multistage centrifugal pump, and when in operation, the submersible motor drives the impeller to rotate at a high speed, and liquid filled in the impeller is pumped to the ground under the action of centrifugal force. In the exploitation of a gas well, the submersible electric pump is mainly used for lifting stratum water, and monitoring the lifting liquid amount of the submersible electric pump has guiding significance for the production system adjustment of the well and the normal operation of the pump. If the submersible electric pump lifts the formation water to the ground, the lifting liquid quantity can be measured only by additionally arranging a liquid flowmeter at the outlet of the submersible electric pump, but the formation water is required to be treated when the formation water is lifted to the ground, otherwise, the environment is polluted. The current common methods comprise pulling and pipeline transportation, and the two methods consume higher cost, especially the water content in the produced liquid is very high in the middle and later stages of gas field entering into production, which is more remarkable.
In order to solve the problem, the same-well production and injection technology is used in the exploitation of the gas well, namely, the produced liquid of the water gas well is separated underground, then the separated water is reinjected into another water layer or depleted gas layer underground, at the moment, the electric submersible pump does not need to lift stratum water to the ground, and the underground flowmeter is installed underground to measure the amount of the liquid lifted by the electric submersible pump.
For example, in the chinese patent of the utility model with the issued publication number CN105888646B and the issued publication date 2019, 03 and 12, an online real-time measuring system and method for the capillary pressure measurement electric pump well are disclosed. Although the metering system can finish metering the liquid lifting amount of the submersible electric pump, the problem of failure caused by leakage easily occurs when the capillary tube is used for measuring pressure, so the metering system is not suitable for popularization in production.
Therefore, in the chinese patent of utility model, CN 212843775U, and 2021, 03 and 30, a gas-liquid two-phase flow meter with an integrated venturi tube is provided, where the flow meter includes a venturi tube, the venturi tube includes a constriction section, a venturi tube, and a diffusion section, in the extending direction of the venturi tube, a first pressure measurement point and a second pressure measurement point are arranged in the constriction section at intervals, and a third pressure measurement point is arranged in the venturi tube. The flowmeter measures the total flow of the wet gas first and then calculates the liquid phase content in the total flow of the wet gas. However, a specific calculation method of the liquid phase content is not recorded in this patent document.
Disclosure of Invention
The utility model aims to provide a pumping flow metering device of an underground pump, which aims to solve the technical problem of flow metering of water pumped by the underground pump in the prior art. Meanwhile, the utility model also provides a pumping flow metering method of the underground pump, so as to solve the problems.
The pumping flow metering device of the underground pump adopts the following technical scheme:
the pumping flow metering device of the underground pump comprises a venturi tube, wherein the venturi tube comprises a contraction section, a venturi tube and a diffusion section, a lower joint used for being connected with a pumping outlet of the underground pump is arranged at an opening corresponding to the contraction section, and an upper joint used for being connected with an air exhaust pipeline is arranged at an opening corresponding to the diffusion section; the inside of the contraction section and the inside of the venturi tube are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the contraction section and the venturi tube when the air-water mixture passes through the venturi tube, and/or the inside of the diffusion section and the inside of the venturi tube are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the diffusion section and the venturi tube when the air-water mixture passes through the venturi tube; the metering device also comprises processing equipment, wherein the processing equipment is connected with each temperature sensor and each pressure sensor to receive measured data and calculate the flow of water in the total flow of the gas-water mixture through an internal calculation program according to the measured temperature difference, the measured pressure difference and the density relation of the gas-liquid mixture.
The beneficial effects are that: when the underground pump pumping flow metering device is used, the lower connector is connected to the pumping outlet of the underground pump, the upper connector is connected to the pumping pipe, the underground pump is started, the pressure difference and the temperature difference of the air-water mixture in the corresponding section are measured through the temperature sensor and the pressure sensor in the corresponding position in the venturi tube, the content of gas in the air-water mixture is judged according to the measured pressure difference and the measured temperature difference by a calculation program in the treatment equipment, the density of the air-water mixture is calculated according to the content of the gas in the air-water mixture, the total flow of the air-water mixture is calculated according to the measured temperature difference and the measured relationship between the pressure difference and the density of the air-water mixture, and the flow of water in the total flow of the air-water mixture is finally calculated. Compared with the mode that an underground capillary single-point pressure measuring device and an underground wellhead pressure temperature measuring device are required to be installed underground in the prior art, the underground metering device provided by the utility model is simple in structure, safe, reliable and suitable for popularization in production. In addition, the underground metering device provided by the utility model calculates the flow of the water in the total flow of the gas-water mixture according to the measured temperature difference, the measured pressure difference and the measured density of the gas-water mixture, so that the metering precision is higher.
Further, the contraction section, the pressure sensor and the temperature sensor in the throat are temperature-pressure integrated sensors.
The beneficial effects are that: the pressure sensor and the temperature sensor adopt temperature and pressure integrated sensors, so that the number of the sensors can be reduced, and the mounting efficiency of the sensors is improved.
Further, the processing device comprises a processor arranged on the ground, and the processor is connected with each temperature sensor and each pressure sensor to receive data measured by each temperature sensor and each pressure sensor and operate the received data.
The beneficial effects are that: because the environment in pit is more complicated, the processor is arranged in the pit and needs to provide better protective structure, so that the size of the processing equipment is oversized, the arrangement difficulty of the processing equipment is increased, the requirement for protection when the processor is arranged on the ground is reduced, and the production cost is reduced while the installation is convenient.
Further, the upper joint is a tubing coupling, and the lower joint is a tubing pin.
The beneficial effects are that: the first is to facilitate the disassembly and assembly, and the second is to improve the sealing property during the connection.
Further, the processing equipment is also connected with a display screen to display the calculated water flow.
The beneficial effects are that: the operation result is displayed through the display screen, so that a worker can conveniently observe the flow of water more intuitively.
The method for measuring the pumping flow of the underground pump adopts the following technical scheme:
the method for measuring the pumping flow of the underground pump specifically comprises the following steps:
step 1: under the laboratory condition, the temperature difference between the constriction section and the venturi tube or between the venturi tube and the diffusion section of the venturi tube when the air-water mixture passes through the venturi tube under the conditions of different pressure differences and different air contents is measured, so that the relation between the air contents of the air-water mixture and the pressure differences and the temperature differences generated by the air-water mixture passing through the venturi tube is obtained;
step 2: connecting a venturi tube at a pumping outlet of the downhole pump, and measuring a pressure difference and a temperature difference of the air-water mixture between a constriction section and a throat of the venturi tube or measuring a pressure difference and a temperature difference of the air-water mixture between the throat and a diffusion section of the venturi tube when the air-water mixture passes through the venturi tube; determining the air content of the air-water mixture according to the measured air content and the relation between the pressure difference and the temperature difference measured in the step 1;
step 3: calculating the density of the gas-water mixture:
ρ＝F g ρ g +(1-F g )ρ L (1)
in the formula (1), ρ is the density of the gas-water mixture, F g Is the gas content rate of the gas-water mixture, ρ g Is the density of the gas in the gas-water mixture, ρ L Is the density of the liquid in the gas-water mixture;
step 4: calculating the total flow of the air-water mixture:
in the formula (2), Q is the total flow of the air-water mixture, C is the outflow coefficient of the venturi tube, A is the cross-sectional area of the throat part of the venturi tube, beta is the ratio of the inner diameter of a pipeline of the venturi tube corresponding to the pressure difference measurement position of the air-water mixture, rho is the density of the air-water mixture, and delta P is the pressure difference generated by the air-water mixture;
step 5: calculating the flow rate of water in the air-water mixture:
Q L ＝Q-Q×F g (3)
in the formula (3), Q L Q is the total flow of the air-water mixture, F is the flow of the water in the air-water mixture g Is the gas-containing rate of the gas-water mixture.
The beneficial effects are that: when the flow rate of water in the total flow rate of the gas-water mixture pumped by the underground pump is measured, the relation between the gas-water mixture gas-containing rate and the pressure difference and the temperature difference generated by the venturi tube is measured in a laboratory, then the venturi tube is connected to the pumping outlet of the underground pump, the pressure difference and the temperature difference generated by the gas-water mixture passing through the venturi tube are measured, the gas-water mixture gas-containing rate is obtained through the relation between the comparison and the gas-water mixture gas-containing rate, then the density of the gas-water mixture is accurately calculated, the obtained density of the gas-water mixture is brought into a corresponding formula to obtain the total flow rate of the gas-water mixture, and the water flow rate of the total flow rate of the gas-water mixture is calculated by using the gas-water mixture gas-containing rate obtained before. The method can accurately determine the air content of the air-water mixture by utilizing the relation between the air content of the air-water mixture and the pressure difference and the temperature difference generated by the venturi tube, thereby accurately obtaining the flow of the water in the total flow of the air-water mixture. In addition, the method has less data to be measured, has smaller calculated amount and is suitable for popularization in production.
Further, a temperature and pressure integrated sensor is arranged in the venturi tube so as to measure the pressure difference and the temperature difference of the air-water mixture between the corresponding section and the venturi tube when the air-water mixture passes through the venturi tube.
The beneficial effects are that: the pressure sensor and the temperature sensor adopt temperature and pressure integrated sensors, so that the number of the sensors can be reduced, and the mounting efficiency of the sensors is improved.
Further, the formula for calculating the density of the gas-water mixture, the formula for calculating the total flow of the gas-water mixture and the formula for calculating the flow of the water are all programmed into a calculation program of the processor, and the flow of the water in the total flow of the gas-water mixture can be directly calculated by the processor.
The beneficial effects are that: the processor has strong calculation capability, and can timely calculate the flow of water, so that the monitoring of the underground pump can be effectively realized in real time.
Further, the processor is also connected with a display screen to display the result obtained by operation.
The beneficial effects are that: the operation result is displayed through the display screen, so that a worker can conveniently observe the flow of water more intuitively.
Further, the relationship between the air content of the air-water mixture and the pressure difference and the temperature difference generated by the venturi tube is made into a relationship graph.
The beneficial effects are that: the relationship graph is more intuitive than the relationship table, and is more labor-saving and faster to look up.
Drawings
FIG. 1 is a schematic diagram of a pumping flow metering device for a downhole pump (the downhole sensor and processor are not shown);
FIG. 2 is a schematic illustration of the downhole pump pumping flow metering device of FIG. 1 in use;
FIG. 3 is a graph of the gas-to-water ratio versus the pressure differential and temperature differential created as the mixture passes between the constriction and the throat.
The names of the corresponding components in the figures are:
1. a venturi tube; 11. a constriction section; 12. an inlet cylinder section; 13. an inlet cone section; 14. a throat; 15. a diffusion section; 16. an outlet cylinder section; 17. an outlet cone section; 2. an upper joint; 3. a lower joint; 4. a downhole pump; 5. a gas well casing; 6. an air extraction pipeline; 7. an armored cable.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
It should be noted that in the present embodiment, relational terms such as "first" and "second" and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" or the like, as may occur, does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the depicted element.
In the description of the present utility model, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.
In the description of the present utility model, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.
The present utility model is described in further detail below with reference to examples.
Example 1 of a downhole pump flow metering device of the present utility model:
as shown in fig. 1, the pumping flow metering device of the downhole pump provided by the embodiment comprises a venturi tube 1, wherein the venturi tube 1 comprises a contraction section 11, a throat 14 and a diffusion section 15, a lower joint 3 used for being connected with a pumping outlet of the downhole pump 4 is arranged at an opening corresponding to the contraction section 11, and an upper joint 2 used for being connected with an air extraction pipeline 6 is arranged at an opening corresponding to the diffusion section 15. The inside of shrink section 11 and choke 14 all is equipped with pressure sensor and temperature sensor to detect the pressure and the temperature of gas-water mixture respectively when the gas-water mixture passes through shrink section 11 and choke 14, metering device still includes processing equipment, and processing equipment obtains the flow of water in the gas-water mixture total flow that pump 4 pumps in the pit through the operation with the data that detects.
In this embodiment, as shown in fig. 1, the structure of the venturi tube 1 is that the constriction section 11, the throat 14 and the diffusion section 15 are sequentially arranged from bottom to top, the opening of the constriction section 11 corresponds to the inlet of the venturi tube 1, that is, the lower joint 3 is disposed at the inlet of the venturi tube 1, and the opening of the diffusion section 15 corresponds to the outlet of the venturi tube 1, that is, the upper joint 2 is disposed at the outlet of the venturi tube 1. In this embodiment, as shown in fig. 1, the contraction section 11 includes an inlet cylindrical section 12 and an inlet conical section 13, the lower joint 3 is specifically disposed at an opening of the inlet cylindrical section 12, the lower joint 3 is specifically an oil pipe pin, the diffusion section 15 includes an outlet cylindrical section 16 and an outlet conical section 17, the upper joint 2 is specifically disposed at an opening of the outlet cylindrical section 16, and the upper joint 2 is specifically an oil pipe coupling.
In this embodiment, the temperature sensor and the pressure sensor inside the contraction section 11 and the throat 14 are all temperature-pressure integrated sensors, and when the air-water mixture passes through the contraction section 11 and the throat 14, the corresponding temperature-pressure integrated sensors can measure the temperature and the pressure of the air-water mixture at the corresponding positions, and the pressure difference and the temperature difference generated when the air-water mixture passes through the contraction section 11 and the throat 14 can be obtained through calculation. In addition, in this embodiment, a temperature-pressure integrated sensor is also disposed in the diffusion section 15, and the temperature-pressure integrated sensor in the diffusion section 15 can detect the pressure and the temperature of the air-water mixture flowing out of the venturi tube 1, so as to facilitate the simulation calculation of the speed of the air-water mixture flowing out of the venturi tube 1.
In this embodiment, as shown in fig. 2, the processing device includes a processor, and temperature and pressure integrated sensors inside the contraction section 11, the throat 14 and the diffusion section 15 are connected to the processing device through cables to receive data measured by the temperature and pressure integrated sensors. In this embodiment, the processor is disposed on the ground, and the processor processes and calculates the received data.
Before using the downhole pump pumping flow metering device provided in this embodiment, under experimental conditions, the temperature difference between the constriction 11 and the throat 14 of the venturi tube 1 and the temperature difference between the gas-water mixture passing through the constriction 11 and the throat 14 under different pressure differences and different gas contents is measured, so as to obtain the relationship between the gas content of the gas-water mixture and the pressure difference and the temperature difference generated when the gas-water mixture passes through the constriction 11 and the throat 14, and a relationship diagram is made according to the corresponding relationship, wherein the relationship diagram is shown in fig. 3, delta T represents the temperature difference generated by the gas-water mixture, delta P represents the pressure difference generated by the gas-water mixture, and F g1 、F g2 、F g3 、F g4 、F g5 、F g6 The gas-water mixture gas-containing rate under different temperature difference and pressure difference conditions is respectively shown, and after the temperature difference and the pressure difference between the gas-water mixture passing through the contraction section 11 and the throat pipe 14 are measured, the gas-water mixture gas-containing rate can be rapidly determined by the comparison relation diagram. In this embodiment, the relationship chart is programmed into the calculation program of the controller, and the processor can directly obtain the air-containing rate of the air-water mixture through calculation and comparison.
After obtaining the gas-water mixture gas-containing rate, calculating the density of the gas-water mixture according to the gas-containing rate, wherein the formula for calculating the density of the gas-water mixture is ρ=f g ρ g +(1-F g )ρ L The formula for defining and calculating the density of the air-water mixture is shown as formula 1, wherein in the formula 1, ρ is the density of the air-water mixture, F g Is the gas content rate of the gas-water mixture, ρ g Is the density of the gas in the gas-water mixture, ρ L Is the density of water in the gas-water mixture. Incidentally, ρ g And ρ L Are all known data. After the density of the gas-water mixture is calculated, the total flow of the gas-water mixture is calculated, and the formula for calculating the total flow of the gas-water mixture is as followsDefining a formula for calculating the total flow of the gas-water mixture as formula 2, wherein in formula 2, Q is the total flow of the gas-water mixture, C is the outflow coefficient of the venturi tube 1, A is the cross-sectional area at the throat of the venturi tube 1, beta is the ratio of the inner diameter of a pipeline at the venturi tube 1 corresponding to the pressure difference measurement position of the gas-water mixture, ρ is the density of the gas-water mixture, and ΔP is the pressure difference generated by the gas-water mixture; after the total flow of the air-water mixture is calculated, the flow of water in the total flow of the air-water mixture is calculated, and the formula for calculating the flow of water is Q L ＝Q-Q×F g The formula for defining the flow rate of the calculated water is formula 3, in formula 3, Q L Q is the total flow of the air-water mixture, F is the flow of the water in the air-water mixture g Is the gas-containing rate of the gas-water mixture.
In this embodiment, a formula for calculating the density of the air-water mixture, a formula for calculating the total flow of the air-water mixture, and a formula for calculating the flow of water are also programmed into the calculation program of the processor, and the processor can calculate the flow of water in the total flow of the air-water mixture. In addition, the processing equipment is also connected with a display screen, the display screen is arranged on the ground, and the display screen can display the operation result of the processor.
When the downhole pump pumping flow metering device provided by the embodiment is used, as shown in fig. 2, the downhole pump 4 is positioned in the gas well casing 5, the lower joint 3 is connected with the pumping outlet of the downhole pump 4, and the upper joint 2 is connected with the pumping pipeline 6. The temperature and pressure integrated sensors are connected with processing equipment through cables, and specifically are connected with the processing equipment through armored cables 7.
In this embodiment, the precision of the temperature and pressure integrated sensor is 0.01Mpa and 0.01 ℃, the housing of the venturi tube 1 is made of stainless steel, and the stainless steel housing can bear 45Mpa of pressure and 120 ℃.
Example 2 of the downhole pump pumping flow metering device of the present utility model:
the difference between this embodiment and embodiment 1 is that in embodiment 1, temperature and pressure integrated sensors are provided in the constriction section, throat and diffuser section of the venturi tube. In this embodiment, temperature and pressure integrated sensors are provided only in the constriction section of the venturi tube and the inside of the throat tube. In other embodiments, temperature and pressure integrated sensors may be disposed only in the diffuser and the venturi, so that a pressure difference and a temperature difference generated when the mixture of air and water passes through the venturi and the diffuser may be obtained by calculation. The corresponding temperature difference and pressure difference are correspondingly carried in the operation process of the processor to calculate.
Example 3 of the pump flow metering device of the present utility model downhole:
this example differs from example 1 in that in example 1 the processor calculates the temperature and pressure differential created as the incoming air-water mixture passes between the constriction and the throat. In this embodiment, the processor may also carry the temperature difference and the pressure difference generated when the air-water mixture passes through the throat and the diffusion section to calculate, and at this time, the relationship between the air content of the air-water mixture and the pressure difference and the temperature difference generated when the air-water mixture passes through the throat and the diffusion section of the venturi tube needs to be measured in the laboratory correspondingly.
Example 4 of a downhole pump flow metering device of the present utility model:
the present embodiment is different from embodiment 1 in that in embodiment 1, the temperature sensor and the pressure sensor in the contraction section, the throat pipe, and the diffusion section are all integrated sensors. In this embodiment, the temperature sensor and the pressure sensor in the contraction section, the throat pipe and the diffusion section are all separately arranged.
Example 5 of a downhole pump flow metering device of the utility model:
this embodiment differs from embodiment 1 in that in embodiment 1, the processor is disposed on the ground. In this embodiment, the processor is disposed in the casing of the gas well, so that each temperature and pressure integrated sensor is directly connected with the processor, and the processor transmits the operation result to the ground equipment for display after the operation result is obtained. It is emphasized that when the processor is disposed within a gas well casing, a compressive and corrosion resistant protective structure is required for the processor.
Example 6 of the pump flow metering device of the present utility model downhole:
the present embodiment is different from embodiment 1 in that in embodiment 1, the processor and each temperature and pressure integrated sensor are connected by a cable. In this embodiment, the processor is connected with each temperature and pressure integrated sensor in a wireless manner, a wireless signal transmitter is arranged in the gas well casing, each temperature and pressure integrated sensor is connected with the wireless signal transmitter through a cable, and the wireless signal transmitter transmits the received data to the processing equipment through wireless transmission after receiving the measurement data sent by each temperature and pressure integrated sensor.
Embodiments of the downhole pump pumping flow metering method of the present utility model:
the method for measuring the pumping flow of the underground pump provided by the embodiment comprises the steps of firstly arranging temperature sensors in a constriction section and a venturi tube of the venturi tube under laboratory conditions, enabling air-water mixtures with different pressure differences and different air contents to pass through the venturi tube respectively so as to obtain the temperature difference of the air-water mixture between the constriction section and the venturi tube, sorting the relation between the air-water mixture air contents and the pressure difference and the temperature difference generated by the venturi tube according to test results, and preparing the obtained relation into a relation graph.
Then, connect venturi in the pumping outlet department of pump in pit, inside pressure sensor and the temperature sensor of equipartition in the shrink section and the venturi of venturi, temperature sensor and the pressure sensor inside shrink section and the venturi are temperature-pressure integrated sensor, start the pump in pit, make the gas-water mixture of pumping pass through venturi, pressure sensor and the temperature sensor of relevant position department can survey the pressure and the temperature of gas-water mixture in this position, can obtain the pressure difference and the difference in temperature that gas-water mixture produced when contracting between section and the venturi through the calculation. Then, determining the air content of the air-water mixture according to the calculated pressure difference and the temperature difference,and then calculating the density of the gas-water mixture according to the gas content, wherein the formula for calculating the density of the gas-water mixture is rho=F g ρ g +(1-F g )ρ L The formula for defining and calculating the density of the air-water mixture is shown as formula 1, wherein in the formula 1, ρ is the density of the air-water mixture, F g Is the gas content rate of the gas-water mixture, ρ g Is the density of the gas in the gas-water mixture, ρ L Is the density of the liquid in the gas-water mixture. Incidentally, ρ g And ρ L Are known data.
In this embodiment, after the density of the gas-water mixture is calculated, the total flow of the gas-water mixture is calculated, and the formula for calculating the total flow of the gas-water mixture is as followsThe formula for defining and calculating the total flow of the air-water mixture is shown as formula 2, in the formula 2, Q is the total flow of the air-water mixture, C is the outflow coefficient of the venturi tube, A is the cross-sectional area at the throat of the venturi tube, beta is the ratio of the inner diameter of a pipeline at the venturi tube corresponding to the pressure difference measurement position of the air-water mixture, ρ is the density of the air-water mixture, and DeltaP is the pressure difference generated by the air-water mixture.
In this embodiment, after the total flow of the air-water mixture is calculated, the flow of the water in the total flow of the air-water mixture is calculated, and finally the flow of the water in the total flow of the air-water mixture pumped by the downhole pump is obtained, where the formula for calculating the flow of the water is Q L ＝Q-Q×F g The formula for defining the flow rate of the calculated water is formula 3, in formula 3, Q L Q is the total flow of the air-water mixture, F is the flow of the water in the air-water mixture g Is the gas-containing rate of the gas-water mixture.
In this embodiment, a formula for calculating the density of the air-water mixture (i.e., formula 1), a formula for calculating the total flow of the air-water mixture (i.e., formula 2) and a formula for calculating the flow of water (i.e., formula 3) are all programmed into a calculation program of a processor, the processor is connected with each temperature-pressure integrated sensor inside the venturi tube, and the processor can directly obtain the flow of water in the total flow of the air-water mixture through calculation after receiving the measurement data transmitted by each temperature-pressure integrated sensor.
In this embodiment, a graph of the relationship between the air content of the air-water mixture and the pressure difference and temperature difference generated by the venturi tube is also programmed into a calculation program of the controller, and the controller directly determines the air content of the air-water mixture through calculation and comparison.
In this embodiment, the processor is further connected to a display screen, and the display screen may display a result obtained by the operation of the processor.
Example 2 of the downhole pump pumping flow metering method of the present utility model:
this embodiment differs from embodiment 1 in that in embodiment 1, pressure sensors and temperature sensors are disposed in the constriction section of the venturi tube and the inside of the throat tube. In this embodiment, pressure sensors and temperature sensors may be disposed inside the venturi and the diffuser, and the measured pressure difference and temperature difference are the pressure difference and temperature difference generated by the air-water mixture between the diffuser and the venturi. Correspondingly, under laboratory conditions, temperature sensors should be respectively arranged inside the venturi tube throat and the diffusion section, so as to obtain the relationship between the air content of the air-water mixture, the pressure difference and the temperature difference generated by passing through the venturi tube. Further, the order of calculation and the formula of calculation are the same as those of embodiment 1. In other embodiments, pressure sensors and temperature sensors may be disposed in the constriction, throat, and diffusion sections of the venturi, and the controller may select to calculate the temperature difference and pressure difference generated when the mixture of incoming air and water passes between the constriction and throat, or calculate the temperature difference and pressure difference generated when the mixture of incoming air and water passes between the throat and diffusion sections. It should be emphasized that when the temperature difference and the pressure difference between the corresponding section and the throat are calculated, the air-water mixture should have air content corresponding to the air-water mixture when the air-water mixture is brought between the corresponding section and the throat.
Example 3 of the downhole pump flow metering method of the present utility model:
the difference between this example and example 1 is that in example 1, the relationship between the air content of the air-water mixture obtained in the laboratory and the pressure difference and temperature difference generated by the venturi tube is plotted. In this embodiment, after the relationship between the air content of the air-water mixture and the pressure difference and the temperature difference generated by the venturi tube is obtained in the laboratory, the obtained relationship may be made into a relationship table.
The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a pump flow metering device in pit, includes venturi (1), venturi (1) include shrink section (11), choke (14) and diffusion section (15), its characterized in that, the opening part that shrink section (11) corresponds is equipped with and is used for the lower joint (3) of being connected with the pumping export of pump (4) in the pit, the opening part that diffusion section (15) corresponds is equipped with and is used for the top connection (2) of being connected with pumping pipeline (6); the inside of the contraction section (11) and the inside of the throat pipe (14) are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the contraction section (11) and the throat pipe (14) when the air-water mixture passes through the venturi pipe (1), and/or the inside of the diffusion section (15) and the inside of the throat pipe (14) are respectively provided with a pressure sensor and a temperature sensor so as to measure the pressure difference and the temperature difference of the air-water mixture between the diffusion section (15) and the throat pipe (14) when the air-water mixture passes through the venturi pipe (1); the metering device further comprises processing equipment, wherein the processing equipment is connected with each temperature sensor and each pressure sensor to receive measured data and calculate the flow of water in the total flow of the gas-water mixture through an internal calculation program according to the measured temperature difference, the measured relation between the pressure difference and the density of the gas-water mixture.
2. A downhole pump pumping flow metering device according to claim 1, wherein the pressure sensor and temperature sensor inside the constriction (11) and the throat (14) are temperature and pressure integrated sensors.
3. A downhole pump pumping flow metering device according to claim 2, wherein the processing means comprises a processor disposed at the surface, the processor being connected between each temperature sensor and each pressure sensor to receive data measured by each temperature sensor and each pressure sensor and to operate on the received data.
4. A downhole pump pumping flow metering device according to any of claims 1-3, wherein the upper joint (2) is a tubing collar and the lower joint (3) is a tubing pin.
5. A downhole pump pumping flow metering device according to any of claims 1-3, wherein the processing apparatus is further connected with a display screen to display the calculated flow rate of water.
6. The method for measuring the pumping flow of the underground pump is characterized by comprising the following steps of:
step 1: under laboratory conditions, the temperature difference between the constriction section (11) and the venturi tube (14) of the venturi tube (1) or between the venturi tube (14) and the diffusion section (15) of the venturi tube (1) when the air-water mixture passes through the venturi tube (1) under the conditions of different pressure differences and different air contents is measured, so that the relation between the air content of the air-water mixture and the pressure difference and the temperature difference generated by the venturi tube (1) is obtained;
step 2: connecting a venturi tube (1) at a pumping outlet of a downhole pump (4), and measuring a pressure difference and a temperature difference of a gas-water mixture between a constriction section (11) and a throat (14) of the venturi tube (1) or a pressure difference and a temperature difference of the gas-water mixture between the throat (14) and a diffusion section (15) of the venturi tube (1) when the gas-water mixture passes through the venturi tube (1); determining the air content of the air-water mixture according to the measured air content and the relation between the pressure difference and the temperature difference measured in the step 1;
step 3: calculating the density of the gas-water mixture:
ρ＝F g ρ g +(1-F g )ρ L (1)
in the formula (1), ρ is the density of the gas-water mixture, F g Is the gas content rate of the gas-water mixture, ρ g Is the density of the gas in the gas-water mixture, ρ L Is the density of the liquid in the gas-water mixture;
step 4: calculating the total flow of the air-water mixture:
in the formula (2), Q is the total flow of the air-water mixture, C is the outflow coefficient of the venturi tube (1), A is the cross-sectional area at the throat of the venturi tube (1), beta is the ratio of the inner diameter of a pipeline at the venturi tube (1) corresponding to the pressure difference measurement position of the air-water mixture, ρ is the density of the air-water mixture, and DeltaP is the pressure difference generated by the air-water mixture;
step 5: calculating the flow rate of water in the air-water mixture:
Q L ＝Q-Q×F g (3)
in the formula (3), Q L Q is the total flow of the air-water mixture, F is the flow of the water in the air-water mixture g Is the gas-containing rate of the gas-water mixture.
7. A downhole pump pumping flow metering method according to claim 6, wherein a temperature and pressure integrated sensor is arranged inside the venturi (1) to measure the pressure and temperature difference of the gas-water mixture between the respective section and the throat (14) as the gas-water mixture passes the venturi (1).
8. The method of measuring pumping flow rate of a downhole pump according to claim 6, wherein the formula for calculating the density of the mixture of gas and water, the formula for calculating the total flow rate of the mixture of gas and water and the formula for calculating the flow rate of water are all programmed into a calculation program of a processor, and the flow rate of water in the total flow rate of the mixture of gas and water can be directly calculated by the processor.
9. The method of claim 8, wherein the processor is further coupled to a display screen to display the result of the operation.
10. A downhole pump pumping flow metering method according to any of claims 6-9, wherein the gas-water mixture is plotted against the pressure difference, temperature difference generated through the venturi (1).
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| CN202210346159.3A CN116929470A (en) | 2022-03-31 | 2022-03-31 | Underground pump pumping flow metering device and metering method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210346159.3A CN116929470A (en) | 2022-03-31 | 2022-03-31 | Underground pump pumping flow metering device and metering method |
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| CN202210346159.3A Pending CN116929470A (en) | 2022-03-31 | 2022-03-31 | Underground pump pumping flow metering device and metering method |
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