TWI664414B - Underground fluid extraction measurement system and method of obtaining underground fluid extraction volume - Google Patents

Abstract

A subsurface fluid extraction measurement system includes: a capture device, an electric meter unit and a control unit. When the capturing device is in the working state, the underground fluid is taken in the capturing area; the electric meter unit measures the total power consumption of the capturing device in the working state; and the total power consumption of the control unit when the switching device is in the working state is the total intake amount.

Description

Underground fluid extraction measurement system and method for obtaining underground fluid extraction amount

The invention relates to a underground fluid extraction measuring system and a method for obtaining the underground fluid extraction amount, in particular to a subsurface fluid extraction measuring system without a flowmeter and a method for obtaining the underground fluid extraction amount; the invention can be applied to a smart city The water resources are widely deployed.

Under the surface, there are abundant underground resources, and underground fluids are important for people's livelihood. The way in which the underground fluid is pumped is usually excavated underground to the extraction area by means of sinking the well. Then, the fluid is pumped out by electric pumping for use.

One of the conventional methods for obtaining the amount of underground fluid intake is to install an electric pump in the extraction zone and install a flow meter at the rear end of the electrically pumped pipeline to obtain the amount of subsurface fluid extracted by the flowmeter. However, the conventional method for measuring the amount of fluid extraction by the flow meter has the following disadvantages: (a) since the electric pump vibrates during operation, the amount of the flow meter is subject to vibration by the electric pump, resulting in The acquisition of intake is unstable and inaccurate. (b) Because the flowmeter is expensive, it is not suitable for large-scale deployment in the region. (c) Since the subsurface fluid in the extraction zone is subject to liquid level changes during fluid ablation The pressure difference between the upstream pressure and the downstream pressure of the flow meter is changed, which causes the deviation of the amount of extraction obtained by the flow meter.

Another way to obtain the amount of underground fluid extraction is to install a vibration sensor to measure the vibration of the electric pump. As the starting/stopping time of the electric pump in the working state, it is estimated to use the physical conversion method. The amount of extraction of the subsurface fluid is relatively equivalently obtained. However, this estimation method has the following disadvantages: (a) after the vibration sensor is installed, the vibration signal measured by the vibration sensor has multi-frequency noise due to the loss of the electric pump, resulting in electric pumping. There is an error in the estimated time of working. (b) If the vibration sensor is installed in the extraction area, the measured signal will be affected by the fluctuation of the liquid and the vibration frequency will be shifted. Therefore, if the vibration sensor is applied to the submersible electric pump, It is not possible to estimate when the electric pump is in operation. (c) The method of estimating the amount of extraction by using electric pump vibration because the measurement deviation is large, so a comparison extraction area is needed for Fast Fourier Transform (FFT), and it is impossible to capture a single extraction area. Measurement of quantity. (d) Each measuring point of fluid extraction, the local vibration noise background is different, the distance from the electric pump and the head capacity will affect the interpretation of the correctness of the result.

Therefore, the present invention how to design a subsurface fluid extraction measurement system and a method for obtaining the amount of underground fluid extraction, using the electric energy consumed by the electric pump, accurate electric power start-stop phase analysis, and converting the accurate underground fluid extraction amount.

In order to solve the above problems, the present invention provides a subsurface fluid extraction measurement system to overcome the problems of the prior art. Therefore, the underground fluid extraction measuring system of the present invention comprises: a picking device, in the working state, extracting underground fluid in the capturing area, wherein the working state includes a starting period, and a transporting state Turning time and stop time. The meter unit is coupled to the pick-up device, and the meter unit measures the power consumption of the pick-up device during the start-up period, the power consumption during the running period, and the power consumption during the stop period. And the control unit is coupled to the meter unit, and the control unit converts the starting power consumption to the starting amount, the running power consumption is the running amount, and the stopping power consumption is the stopping amount. Wherein, the control unit adds the total starting amount, the operation intake amount and the stop rotation amount to the total extraction amount, and the total extraction amount corresponds to the extraction amount of the underground fluid when the extraction device is in the working state.

In order to solve the above problems, the present invention provides a method of obtaining the amount of subsurface fluid extraction to overcome the problems of the prior art. Therefore, the method for obtaining the subsurface fluid intake amount of the present invention comprises: providing a scooping device, in the working state, extracting a subsurface fluid in the scooping area, wherein the working state includes a starting period, an operating period, and a stall period. The meter unit is provided to measure the power consumption of the starting device during the starting period, the power consumption during the running period, and the power consumption during the stall period. The control unit is provided, and the power consumption of the conversion start is the start-up amount, the running power consumption is the operation amount, and the power consumption of the stop is the stop-and-go amount. And the sum of the control start-up amount, the operation intake amount and the stop-and-go intake amount are the total extraction amount, and the total extraction amount corresponds to the extraction amount of the underground fluid when the extraction device is in the working state.

In order to further understand the technology, the means and the effect of the present invention in order to achieve the intended purpose, refer to the following detailed description of the invention and the accompanying drawings. The detailed description is to be understood as illustrative and not restrictive.

100‧‧‧Underground fluid extraction measurement system

10‧‧‧Selection device

20‧‧‧Electric meter unit

30‧‧‧Control unit

32‧‧‧Power-Flow Conversion Unit

34‧‧‧Additional unit

36‧‧‧Starting correction unit

38‧‧‧Abrasion Correction Unit

40‧‧‧Level detection unit

42‧‧‧Level correction unit

200‧‧‧ wellhead

300‧‧‧ capture area

Cp‧‧‧Power consumption

Sp‧‧‧Power consumption signal

S1‧‧‧ liquid level signal

Sc‧‧‧compensation signal

A‧‧‧ start-up period

B‧‧‧Operating hours

C‧‧‧ stoppage

A-1‧‧‧Starting power consumption

B-1‧‧‧Power consumption

C-1‧‧‧Stop power consumption

A-2‧‧‧ Start intake

B-2‧‧‧ Operational intake

C-2‧‧‧ stop-and-go volume

(S100)~(S160)‧‧‧ steps

1 is a block diagram of a submerged fluid extraction measurement system of the present invention; FIG. 2A is a schematic diagram of power consumption of the capture device of the present invention during a startup period, an operation period, and a stall period; 2B is a watt hour curve diagram of the capture device of the present invention in an operating state; FIG. 2C is a graph of a ground fluid extraction amount of the capture device of the present invention in an operating state; FIG. 3 is a block diagram of the control unit of the present invention; A flow chart of a method for obtaining a subsurface fluid extraction amount for the present invention.

The technical content and detailed description of the present invention are as follows with reference to the drawings: Please refer to FIG. 1 is a block diagram of the underground fluid extraction measurement system of the present invention. The underground fluid extraction measuring system 100 includes a sampling device 10, an electric meter unit 20, a control unit 30, and a liquid level detecting unit 40. The capturing device 10 is coupled to the electric meter unit 20, and draws underground fluid in the capturing area 300 of the wellhead 200. The meter unit 20 is coupled to the control unit 30 and measures the power consumption Cp of the capture device 10 to provide a power consumption signal Sp corresponding to the power consumption Cp information (for example, the magnitude of the power consumption Cp) to the control unit 30. The control unit 30 receives the power consumption signal Sp and converts the power consumption signal Sp into a subsurface fluid extraction amount to equivalently know the amount of the underground fluid to be extracted by the consumption of the power of the extraction device 10. The liquid level detecting unit 40 is coupled to the control unit 30 and detects the liquid level of the capturing area 300 to provide a liquid level signal S1 to the control unit 30. The manner of operation of the liquid level detecting unit 40 will be further described later.

The subsurface fluid extraction measurement system 100 can be applied in the single phase power field, or in the three phase power field. When the local lower fluid extraction measurement system 100 is applied in the single-phase power field, the meter unit 20 is a single-phase power watt-hour meter. When the local lower fluid extraction measurement system 100 is applied in the three-phase power field, the meter unit 20 is a three-phase power watt-hour meter. The meter unit 20 can transmit the power consumption signal Sp to the control unit 30 by means of wired or wireless transmission. The manner of wireless transmission is, for example, but not limited to, ZigBee transmission, SIGFPX transmission, LORA transmission, 4G transmission, 4G NB-IOT transmission, or 5G transmission.

The picking device 10 is a submersible electric pump or a ground type electric pump, and may be a single-phase or three-phase electric pump. The electric pump generates power by rotation and draws underground fluid with power. According to the efficiency calculation method of electric pump: η=Pw/Pg (Formula 1), it can be known that when the electric pump is in working condition, the friction loss and heat loss are deducted, and the output capacity of the electric pump can be obtained (ie, electric Pump efficiency). Among them, Pw is hydrodynamic and Pg is shaft power (shaft power = hydrodynamic + friction loss + heat loss). When the electric pump is in the working state, the electric pump draws the underground fluid, causing frictional loss between the liquid in the electric pump tube and the impeller. The friction loss varies with the time of use of the electric pump and the gap created by the mechanical structure. The calculation of the work done by the electric pump (ie hydrodynamic) is (in kilowatts): Pw = γ Qh / 6120 (Equation 2). Where Q (1/min) is the head ratio of the electric pump, γ (g/cm3) is the specific gravity of the liquid, and h(m) is the height at which the liquid rises. Therefore, according to the above formulas 1 and 2, it can be known that monitoring the output capacity (Pw/Pg) of the electric pump and converting the amount of electric power consumed by the electric pump into the evaluation of the amount of electric pump pumping is corresponding to linearity. curve.

Further, since the capturing device 10 is in an operating state, it is divided into a starting period, an operating period, and a stopping period, and the amount of power consumed in each working period is not the same, that is, if the time of the above three stages is consumed. If the TV is the same, it will overestimate the actual amount of underground fluids taken per unit time. When evaluating the pumping amount of an electric pump with different working periods, it can be found that it is not simply a linear curve of a single slope, but a linear function of a plurality of different slopes. Therefore, the present invention aims to evaluate the amount of electric pumping by measuring the amount of electricity consumed during different working hours to establish an accurate conversion relationship between the amount of electricity and the flow, and a method for obtaining an accurate amount of underground fluid intake.

It is worth mentioning that in an embodiment of the present invention, the underground fluid refers to groundwater resources, but is not limited thereto. For example, but not limited to, the subsurface fluid can be petroleum or oil shale. In addition, in an embodiment of the present invention, the underground fluid extraction measurement system 100 is mainly applied to the extraction measurement system for obtaining the underground fluid extraction amount, but is not limited to the application only in the field of obtaining underground fluid. In other words, the invention The subsurface fluid extraction measurement system 100 can also be applied to a system that utilizes the extraction device 10 to draw fluid from the capture zone 300. For example, but not limited to, the roof pumping system of the building.

2A is a schematic diagram of the power consumption of the capture device of the present invention during the startup period, the operation period, and the stall period, FIG. 2B is a watt hour diagram of the capture device in the working state, and FIG. 2C is the capture device of the present invention. The graph of the underground fluid intake in the working state, see Figure 1 for the complex fit. When the capture device 10 is in the working state, it is divided into a start period A, an operation period B, and a stop period C. When the capturing device 10 is in the working state of the starting period A, the running period B, and the stopping period C, the underground fluid is extracted in the capturing area 300, and the meter unit 20 passes the measuring and extracting device 10 to separately learn the power consumption of the individual time period. Cp (as shown in FIG. 2B, including the startup power consumption A-1 of the startup period A, the operation power consumption B-1 of the operation period B, and the stall power consumption C-1 of the stall period C).

The meter unit 20 provides the power consumption signal Sp to the control unit 30 according to the measured power consumption Cp of the individual time period, so that the control unit 30 converts the power consumption signal Sp into the amount of the individual time period (as shown in FIG. 2C, including the corresponding start-up consumption). The start-up amount A-2 of the electric quantity A-1, the operation intake amount B-2 corresponding to the operation electric power consumption B-1, and the stop-off intake amount C-2 corresponding to the stop-discharge power consumption C-1. Then, After the control unit 30 sums the starting extraction amount A-2, the operation extraction amount B-2, and the stop rotation extraction amount C-2, it is the total extraction amount of the extraction device 10 in the working state (that is, the extraction of the underground fluid) the amount).

Further, as can be seen from FIGS. 2B to 2C, the curve of power consumption is exactly the opposite of the curve of the amount of intake. The reason for this is that when the pumping device 10 is in the starting period A, the load is large, and the pipeline inside the pumping device 10 is usually also contaminated with air, thereby causing running resistance. Therefore, the actual amount of pick-up device 10 will be lower than the ideal value. Therefore, if a conventional method of estimating the time during which the electric pump is in operation is applied, the amount of extraction obtained must be higher than the ideal value. It can be known from the start period A, the start power consumption A-1, and the corresponding start-up amount A-2 that when the pick-up device 10 is started, since the trapping device 10 is filled with impurities and air inside the pipeline, the start period A is started. The pumping device 10 needs to consume a large amount of electricity, but the fluid resistance is relatively large, so the actual starting amount of the intake A-2 is not high, and the flow resistance must be stabilized. After the determination (intended to enter the operation period B), the operation power consumption B-1 consumed by the extraction device 10 is linearly proportional to the operation intake amount B-2.

Please refer to FIG. 3, which is a block diagram of the control unit of the present invention. Referring to FIG. 1~2B for complex cooperation. The control unit 30 includes a power-flow conversion unit 32, a summation unit 34, a startup correction unit 36, an abrasion correction unit 38, and a liquid level correction unit 42. The power-flow conversion unit 32 is coupled to the meter unit 20 (see FIG. 1 for cooperation), and the sum-up unit 34 is coupled to the power-flow conversion unit 32. The power-flow conversion unit 32 receives the power consumption signal Sp provided by the electricity meter unit 20, and converts the startup power consumption amount A-1 recorded in the power consumption signal Sp into the startup extraction amount A-2, and the operation power consumption amount B. -1 is converted into the operation intake amount B-2, and the stall power consumption amount C-1 is converted into the stop rotation intake amount C-2 (that is, FIG. 2B is converted into FIG. 2C). The summing unit 34 adds the starting intake amount A-2, the operation intake amount B-2, and the stop rotation intake amount C-2, and then obtains the total extraction amount. The control unit 30 can provide the acquired total amount of the captured device to the device at the back end (not shown) or display the display unit (not shown) for the user to know the total amount of the current acquisition.

The startup correction unit 36 is coupled to the power-flow conversion unit 32 and, as the compensation extraction device 10 in the startup period A, is activated by the startup power consumption A-1 due to the presence of fluid impedance, air or foreign matter. The amount A-2 and the actual start-up amount produced a drop. Therefore, the start-up amount A-2 of the pick-up device 10 in the start-up period A is compensated by the start-up correction unit 36 to achieve the effect of bringing the ideal value of the start-up amount A-2 closer to the actual value.

The wear correction unit 38 is coupled to the power-flow conversion unit 32 and compensates for the total amount of intake. Specifically, since the extraction device 10 is operated for a period of time, the internal mechanical structure of the extraction device 10 may be worn due to continuous operation. Therefore, the total power consumption consumed by the initial operation of the skimming device 10 is the same as the total power consumption consumed after a period of time, but the total amount of the available intake is limited. Therefore, by utilizing the manner in which the wear correction unit 38 compensates for the total amount of extraction, it is possible to achieve the effect that the ideal total amount of extraction of the extraction device 10 is still close to the actual total amount of extraction after a period of operation.

It is worth mentioning that in an embodiment of the present invention, the control unit 30 may include a learning unit (not shown). The learning unit is coupled to the power-flow conversion unit 32, the startup correction unit 36, the wear correction unit 38, and the liquid level correction unit 42, and provides a power-flow conversion unit 32, a startup correction unit 36, an abrasion correction unit 38, and a liquid level correction unit. The learning function of 42 enables the compensation of the power-flow conversion unit 32, the startup correction unit 36, and the wear correction unit 38 to be more precise. The learning unit is, for example, but not limited to, a control unit having a learning function such as a fuzzy control system, a genetic algorithm, or the like. In addition, in an embodiment of the present invention, each unit inside the control unit may be a physical control circuit formed by a hardware architecture, a program-driven control software, or a firmware control structure between the software and the hardware.

Please refer to Figure 1, and the complex fit is shown in Figures 2~3. The liquid level correcting unit 42 is coupled to the liquid level detecting unit 40 and the power-flow converting unit 32. The liquid level detecting unit 40 detects the liquid level of the capturing area 300 and provides the liquid level signal S1 to the liquid level correcting unit 42. The liquid level correction unit 42 provides the compensation signal Sc to the electricity-flow conversion unit 32, so that the electricity-flow conversion unit 32 compensates the total extraction amount according to the compensation signal Sc. Specifically, since the underground fluid may cause excessive liquid level difference due to the abundance and dryness period or other factors, the difference in upstream and downstream pressures may result in inaccurate acquisition of the underground fluid. Therefore, the liquid level detecting unit 40 is assisted to confirm the change of the liquid level, and the liquid level correcting unit 42 is used to compensate the difference of the liquid level, so as to achieve the effect that the ideal value of the total extraction amount is closer to the actual value. It is worth mentioning that in one embodiment of the present invention, the liquid level detecting unit 40 may be a mechanical liquid level meter or an electronic liquid level meter, but is not limited thereto. In other words, the liquid level detecting unit 40 which can detect various liquid level differences should be included in the present invention.

Please refer to FIG. 4 , which is a flow chart of a method for obtaining the amount of underground fluid extraction according to the present invention. Referring to FIGS. 1 to 3 for complex cooperation. The underground fluid extraction measurement system 100 includes a capture device 10, an electric meter unit 20, a control unit 30, and a liquid level detecting unit 40, and the method for obtaining the underground fluid intake amount first includes: when the extraction device is in the working state, the underground extraction unit draws the underground Fluid (S100). When the capture device 10 is in the working state, it is divided into a start period A, an operation period B, and a stop period C. The pumping device 10 draws the underground fluid in the capturing zone 300 during the operating state of the starting period A, the operating period B, and the stalling period C.

Then, the meter unit measures the starting power consumption of the capturing device during the starting period, the operating power consumption during the running period, and the stalling power consumption during the stall period (S120). The meter unit 20 detects the power consumption Cp of the individual time period (including the starting power consumption A-1 of the starting period A, the operating power consumption B-1 of the operating period B, and the stop) by measuring the capturing device 10, respectively. The stoppage power consumption of the time period C is C-1).

Then, the control unit converts the startup power consumption to the startup extraction amount, the operation power consumption to the operation extraction amount, and the stop rotation power consumption to the stall rotation amount (S140). The meter unit 20 provides the power consumption signal Sp to the control unit 30 according to the measured power consumption Cp of the individual time period, and the control unit 30 converts the power consumption signal Sp into the amount of the individual time period (as shown in FIG. 2C, including the corresponding start power consumption). The start amount A-2 of the amount A-1, the operation intake amount B-2 corresponding to the operation power consumption B-1, and the stop loss amount C-2 corresponding to the stop power consumption C-1. The power-flow conversion unit 32 of the control unit 30 receives the power consumption signal Sp, and converts the startup power consumption A-1 recorded in the power consumption signal Sp into the startup extraction amount A-2, and the operation power consumption amount B. -1 is converted to the operation intake amount B-2, and the stall power consumption amount C-1 is converted into the stop rotation intake amount C-2.

Moreover, the startup correction unit 36 of the control unit 30 acts as the compensation extraction device 10 in the startup period A, and causes the startup amount A-2 to be converted by the startup power consumption A-1 due to the presence of fluid impedance, air or foreign matter. There is a drop in the amount of actual start-up. The wear correcting unit 38 of the control unit 30 acts as a compensation for the total amount of wear that the internal mechanical structure of the picking device 10 will cause wear due to continuous operation after a period of operation. The liquid level detecting unit 40 detects the liquid level of the capturing area 300, so that the control unit 30 can compensate the underground fluid for a total amount of liquid level difference due to abundance or other factors.

Finally, the control unit adds the total intake amount, the operation intake amount, and the stop rotation amount to the total extraction amount (S160). The summing unit 34 of the control unit 30 sums the starting extraction amount A-2, the operation extraction amount B-2, and the stop rotation extraction amount C-2, that is, the total extraction amount of the capturing device 10 in the working state (ie, For the amount of fluid extracted from the ground).

In summary, the embodiments of the present invention have the following advantages and effects: 1. The main purpose of the present invention is to estimate the amount of electric pump pumping by measuring the amount of electricity consumed during different working hours to establish an accurate conversion relationship between the amount of electricity and the flow, thereby replacing the conventional galvanometer. The utility model achieves the advantages of saving device cost and facilitating mass deployment; 2. Since the control unit of the invention separately knows the power consumption of the individual time period and converts the power consumption into the extraction amount of the individual time period, it can be accurately known The function of the total extraction amount when the device is in the working state; 3. Since the control unit includes the startup correction unit as the compensation extraction device in the startup period, due to the existence of fluid impedance, air or foreign matter, the power consumption is changed by the startup. The amount of start-up and the actual amount of start-up intake are different, so that the effect of making the ideal value of the start-up amount closer to the actual value can be achieved; 4. Since the control unit includes the wear-correcting unit as the compensation, the device is operated for a period of time. The internal mechanical structure of the pick-up device will wear out due to continuous operation, resulting in a drop in the total amount of extraction. Phenomenon, therefore, the effect that the ideal total extraction amount is still close to the actual total extraction amount after the extraction device is operated for a period of time; and 5. Since the control unit can include the supply of the electricity-flow conversion unit, the startup correction unit The learning unit of the learning function of the wear correction unit and the liquid level correction unit can achieve the compensation of the electricity-flow conversion unit, the startup correction unit and the wear correction unit, and can have more precise effects.

However, the above description is only for the detailed description and the drawings of the preferred embodiments of the present invention, and the present invention is not limited thereto, and is not intended to limit the present invention. The scope of the patent application is intended to be included in the scope of the present invention, and any one skilled in the art can readily appreciate it in the field of the present invention. Variations or modifications may be covered by the patents in this case below.

Claims (11)

An underground fluid extraction measuring system comprises: a picking device, in a working state, extracting a subsurface fluid in a capturing area, wherein the working state comprises a starting period, an operating period and a stop period; and an electric meter unit, The power consumption unit is configured to measure a power consumption of the powering device during the startup period, a power consumption during the operating period, and a power consumption of the power stop during the running time period; And a control unit coupled to the meter unit, and the control unit converts the startup power consumption to an activation amount, the operation power consumption is an operation extraction amount, and the stall power consumption is a stop operation amount The control unit includes: a power-flow conversion unit coupled to the meter unit, and converting the startup power consumption into the startup intake amount, converting the operation power consumption into the operation extraction amount, and stopping the operation Converting the power consumption into the stalling amount; and activating the correction unit, coupling the power-flow conversion unit, and correcting the power-flow conversion unit to enable the power-flow conversion unit to pass the startup The correction unit corrects the amount of the start-up, wherein the control unit sums the start-up amount, the operation amount, and the stop-off amount as a total amount, and the total amount is corresponding to the device when the device is in the working state. The amount of fluid extracted from the ground. The underground fluid extraction measurement system of claim 1, wherein the control unit further comprises: an abrasion correction unit coupled to the electricity-flow conversion unit; wherein the wear correction unit corrects the electricity-flow conversion unit And causing the power-flow conversion unit to correct the total intake amount. The underground fluid extraction measurement system described in claim 1 of the patent application scope further includes: a liquid level detecting unit coupled to the control unit and detecting a liquid level of the capturing area; wherein the control unit corrects the power-flow converting unit according to the liquid level and via a liquid level correcting unit, so that The power-flow conversion unit calibrates a summation unit to compensate for the total intake. The underground fluid extraction measuring system according to claim 3, wherein the liquid level detecting unit can be a mechanical liquid level meter or an electronic liquid level meter. The underground fluid extraction measurement system of claim 1, wherein the electricity meter unit can provide the startup power consumption, the operation power consumption, and the power consumption of the shutdown to the control unit through a wireless transmission. The underground fluid extraction measurement system of claim 5, wherein the wireless transmission can be a ZigBee transmission, a SIGFPOX transmission, a LORA transmission, a 4G transmission, a 4G NB-IOT transmission, or a 5G transmission. The underground fluid extraction measurement system according to claim 1, wherein the extraction device is a submersible electric pump or a ground type electric pump. The underground fluid extraction measuring system according to claim 1, wherein the electric meter unit is a single-phase electric power watt-hour meter or a three-phase electric watt-hour meter. A method for obtaining a fluid intake amount of a subsurface fluid, comprising: providing a pumping device, in a working state, extracting a subsurface fluid in a pumping zone, wherein the working state includes a starting period, an operating period, and a stalling period; a meter unit that measures a starting power consumption of the capturing device during the starting period, a running power consumption during the operating period, and a stalling power consumption during the stopping period; providing a control unit to convert the The starting power consumption is a starting intake amount, the running power consumption is a running intake amount, and the stopping power consumption is a stalling intake amount; providing a power-flow converting unit, converting the starting power consumption into The startup intake amount is converted into the operation consumption amount, and the stall power consumption amount is converted into the stop rotation intake amount; Providing a startup correction unit, correcting the power-flow conversion unit, so that the power-flow conversion unit corrects the startup extraction amount by the startup correction unit; and the control unit sums the startup extraction amount, the operation extraction amount, and the stop The transfer amount is a total intake amount, which is the amount of the underground fluid that is taken when the device is in the working state. A method for obtaining a subsurface fluid intake amount as described in claim 9 wherein: an wear correction unit is provided to correct the electric quantity-flow conversion unit to cause the electric quantity-flow conversion unit to correct the total intake amount. A method for obtaining a subsurface fluid intake amount as described in claim 9 wherein: a liquid level detecting unit is provided to detect a liquid level of the scooping area, so that the control unit compensates the total intake amount according to the liquid level .