Intelligent oil-gas-water measuring device and measuring method thereof

Abstract

The invention provides an intelligent oil-gas-water measuring device and a measuring method thereof, and relates to the technical field of oil-gas-water content detection. The technical problem of low detection precision in the prior art is solved. The intelligent oil-gas-water measuring device comprises a closed online measuring container, a valve device, a collection pipeline and a transmission pipeline, a measured fluid inlet and a measured fluid outlet are formed in two ports of the transmission pipeline respectively, and the closed online measuring container is connected with the transmission pipeline through the collection pipeline. The valve device is arranged on the collection pipeline and the transmission pipeline and can control whether the collection pipeline and the transmission pipeline are conducted or not; the closed online measuring container is provided with an online measuring device, and the online measuring device comprises a water level height measuring device, an oil level height measuring device, a heating device, a temperature measuring device and an air pressure measuring device. The method is used for improving the precision of oil-gas-water content detection in petroleum.

Description

Technical Field

[0001] The present invention relates to the technical field of oil, gas and water content detection, and in particular to an intelligent oil, gas and water measuring device and a measuring method thereof. Background Art

[0002] Detecting oil, gas, and water content is crucial for oil production and determining the viability of oil wells. It is essential for achieving digital oilfields. Accurately measuring the oil, gas, and water content in well outputs in real time during production has always been a technical challenge, particularly for the small-yield wells prevalent in domestic oilfields, where effective solutions have been lacking.

[0003] Existing technologies generally separate gas and liquid first, and then use gas flow meters and various liquid flow meters to measure them. For example, a mass flow meter is used to measure the mass flow of the liquid, and an electromagnetic flow meter or an ultrasonic flow meter is used to measure the volume flow by flow velocity measurement, thereby obtaining the content of each component of oil, water and gas. There is also a technology that uses a water content measuring instrument such as a microwave water content meter to directly measure the water content of the oil-water mixture.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] Existing measurement technologies focus on measuring single-phase, stable flow rates. Even for instruments like water cut meters that measure two-phase materials, their accuracy is closely related to the uniformity of the measured material. The oil, gas, and water separation process exhibits significant dynamic characteristics, and gas, in particular, significantly impacts the accuracy of various liquid flow measurement instruments, resulting in unstable flow measurement processes and inaccurate results.

[0006] Domestic oil wells commonly use pumping units as lifting devices, resulting in pulsating flow characteristics in the measured flow rate. This creates a conflict between the measurement speed and accuracy of flow measurement instruments. Pulsating fluids amplify this conflict, reducing measurement accuracy. Furthermore, low-yield wells have low liquid production, resulting in low flow rates, often failing to meet the threshold flow rates of various flow meters.

[0007] All of the above problems cannot be solved by existing measurement technologies. Summary of the Invention

[0008] The embodiments of the present invention provide an intelligent oil, gas and water measuring device and a measuring method thereof, which solve the technical problem of low detection accuracy in the prior art.

[0009] The embodiments of the present invention provide the following technical solutions:

[0010] An embodiment of the present invention provides an intelligent oil, gas and water measuring device, comprising a closed online measuring container, a valve device, a collection pipeline and a transmission pipeline, wherein two ports of the transmission pipeline respectively form an inlet and an outlet of the measured fluid, wherein:

[0011] The closed online measurement container is connected to the transmission pipeline through the collection pipeline, and the valve device is provided on the collection pipeline and the transmission pipeline and can control whether the collection pipeline and the transmission pipeline are conductive;

[0012] When the valve device opens the collection pipeline and closes the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, the measured fluid entering from the measured fluid inlet can enter the closed online measurement container through the collection pipeline; when the valve device opens the collection pipeline and opens the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, the measured fluid in the closed online measurement container can flow out of the measured fluid outlet through the collection pipeline and the transmission pipeline;

[0013] The closed online measurement container is provided with an online measurement device, which includes a water level measurement device, an oil level measurement device, a heating device, a temperature measurement device and an air pressure measurement device;

[0014] The water level measuring device can measure the water level of the measured fluid in the closed online measuring container;

[0015] The oil level measuring device can measure the oil level of the measured fluid in the closed online measuring container;

[0016] The heating device can heat the measured fluid in the closed online measurement container;

[0017] The temperature measuring device can measure the temperature of the gas and liquid in the closed online measurement container;

[0018] The air pressure measuring device can measure the air pressure in the closed online measurement container.

[0019] Optionally, the valve device includes a first two-way valve and a second two-way valve, wherein the first two-way valve is provided on the collection pipeline and can control whether the collection pipeline is conductive; the second two-way valve is provided on a section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid and can control whether the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is conductive;

[0020] Alternatively, the valve device is a three-way valve arranged at the connection between the collection pipeline and the transmission pipeline. When the three-way valve is in a first open state, the collection pipeline is connected, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is closed; when the three-way valve is in a second open state, the collection pipeline is connected, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is also connected; when the three-way valve is in a third open state, the collection pipeline is closed, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is connected.

[0021] Optionally, the first two-way valve and the second two-way valve are both motor-driven ball valves.

[0022] The number of the closed online measurement containers is at least two, wherein:

[0023] The collection pipeline includes a collection main pipeline connected to the transmission pipeline and at least two collection branch pipelines connected to the collection main pipeline, and each of the closed online measurement containers is connected to the collection main pipeline through one of the collection branch pipelines; when the valve device includes the first two-way valve and the second two-way valve, the first two-way valve is disposed on the collection main pipeline; when the valve device is a three-way valve disposed at the connection between the collection pipeline and the transmission pipeline, the three-way valve is disposed at the connection between the collection main pipeline and the transmission pipeline;

[0024] Alternatively, the number of the collection pipelines is at least two, and each of the closed online measurement containers is connected to the transmission pipeline through one of the collection pipelines; when the valve device includes the first two-way valve and the second two-way valve, each of the collection pipelines is provided with a first two-way valve; when the valve device is a three-way valve provided at the connection between the collection pipeline and the transmission pipeline, each of the collection pipelines is provided with a three-way valve at the connection between the collection pipeline and the transmission pipeline.

[0025] Optionally, the first two-way valve and the second two-way valve are both motor-driven ball valves.

[0026] Optionally, the valve device further comprises a one-way valve, which is arranged on a section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid;

[0027] The one-way valve only allows the measured fluid to flow through it to flow toward the measured fluid outlet. The one-way valve is provided with a pressure sensor and a position sensor. The pressure sensor can detect the pressure inside the one-way valve, and the position sensor can detect whether the one-way valve is open (and the degree of opening).

[0028] Optionally, the temperature measuring device includes a temperature measuring rod and a gas temperature measuring chip and a liquid temperature measuring chip distributed at different heights of the temperature measuring rod, and the position height of the gas temperature measuring chip is higher than the position height of the liquid temperature measuring chip; or, the temperature measuring device includes a first temperature measuring rod and a second temperature measuring rod, the bottom end of the first temperature measuring rod is provided with a gas temperature measuring chip, the bottom end of the second temperature measuring rod is provided with a liquid temperature measuring chip, and the length of the first temperature measuring rod is shorter than the length of the second temperature measuring rod.

[0029] Optionally, the water level height measuring device and the oil level height measuring device are both float-type liquid level measuring devices, and the closed online measuring container is also provided with an anti-adhesion vibration device, which can drive the measured fluid in the closed online measuring container to vibrate to prevent the float used in the float-type liquid level measuring device from adhering to the measured fluid.

[0030] Optionally, the anti-adhesion vibration device includes a vibration rod and a vibration mechanism, one end of the vibration rod is fixed on the closed online measurement container, the other end of the vibration rod extends to the bottom of the closed online measurement container, and the vibration mechanism is arranged at the lower end of the vibration rod.

[0031] Optionally, the vibration mechanism includes a housing fixed on the vibration rod and a vibration motor fixed in the housing, and a cam is provided on the rotating shaft of the vibration motor.

[0032] Optionally, a vibration plate is fixedly provided on the housing, and the vibration plate extends out of the housing in a horizontal direction.

[0033] Optionally, the closed online measurement container is a sealed tank, which includes a tank body, a top cover, a power cord, a data cable, an explosion-proof box, and a wireless signal transceiver, wherein:

[0034] The top cover is arranged on the top port of the tank body and seals the top port of the tank body. The power cord and the data cord are connected to the online measuring device in the tank body through the top cover. The explosion-proof box is fixed to the outer wall of the tank body and the explosion-proof box is provided with a power switch, a controller and a display screen. The power switch is connected to the power cord, and the controller is connected to the data cord and can display the data detected by the online measuring device through the display screen and can exchange data with the external control center through the wireless signal transceiver. The data includes valve device control instructions and online measuring device control instructions. The measurement method of the intelligent oil, gas and water measuring device described in any of the above technical solutions provided by the present invention comprises the following steps:

[0035] Step A: Connecting the intelligent oil, gas and water measuring device described in any one of the above technical solutions to an oil pipeline, using the oil transported by the oil pipeline as the measured fluid;

[0036] Step B: controlling the valve device to open the collection pipeline and close the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid, so that the measured fluid conveyed by the measured fluid conveying pipeline enters the measured fluid inlet and enters the closed online measurement container through the collection pipeline; when the amount of the measured fluid in the closed online measurement container meets the measurement conditions, controlling the valve device to close the collection pipeline and open the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid, so that the measured fluid continues to be conveyed through the measured fluid conveying pipeline;

[0037] Step C: controlling the heating device in the online measurement device to heat the measured fluid in the closed online measurement container so that the oil, gas and water in the measured fluid are separated and stratified; measuring the water level of the measured fluid in the closed online measurement container by the water level measuring device; measuring the oil level of the measured fluid in the closed online measurement container by the oil level measuring device; measuring the temperature of the liquid and gas in the closed online measurement container by the temperature measuring device; and measuring the air pressure in the closed online measurement container by the air pressure measuring device;

[0038] Step D: Calculating the respective contents (in fractions by mass) of oil, gas, and water in the measured fluid based on the water level, oil level, temperature, and air pressure values ​​detected by the online measuring device, the pre-known densities of oil, gas, and water, and the corresponding relationships between the volume of the sealed online measuring container and the water level, oil level, temperature, and air pressure values; or calculating the respective volume fractions of oil, gas, and water in the measured fluid based on the water level, oil level, temperature, and air pressure values ​​detected by the online measuring device, and the pre-known corresponding relationships between the volume of the sealed online measuring container and the water level, oil level, temperature, and air pressure values;

[0039] Step E: Control the valve device to open the collection pipeline and the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, so that the measured fluid in the closed online measurement container flows out from the measured fluid outlet through the collection pipeline and the transmission pipeline.

[0040] Any of the above technical solutions provided by the embodiments of the present invention produces at least the following technical effects:

[0041] The intelligent oil, gas and water measuring device provided by the present invention uses a closed online measuring container, so that the output of the oil well within a period of time is completely gathered in the closed online measuring container, and pulsating flow full-cycle sampling is realized, thereby creating conditions for accurately measuring the oil, gas and water content. The heating in the closed container enables the oil, gas and water to be more fully separated and stratified. The combined effect of heating and vibration enables the liquid level to be accurately measured. In addition, the discharge of gas after a measurement is completed effectively clears the substances in the closed container to provide conditions for subsequent measurements. Therefore, the accuracy of three-phase detection of oil, gas and water is better, thereby solving the technical problem of low detection accuracy in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Those skilled in the art may better understand the technical effects of the present invention through the following drawings, wherein:

[0043] Figure 1 A schematic diagram of an intelligent oil, gas and water measuring device provided in an embodiment of the present invention.

[0044] Figure 2 A schematic diagram of another intelligent oil, gas and water measuring device provided by an embodiment of the present invention.

[0045] Figure 3 A schematic diagram of another intelligent oil, gas and water measuring device provided in an embodiment of the present invention.

[0046] Figure 4 A schematic diagram of another intelligent oil, gas and water measuring device provided in an embodiment of the present invention.

[0047] Markings in the figure: 1. Closed online measuring container; 2. Top cover; 3. Air pressure measuring device; 4. Water level measuring device; 41. Float; 5. Anti-adhesion vibration device; 6. Oil level measuring device; 61. Float; 7. Heating device; 8. Temperature measuring device; 9. Display screen; 10. Explosion-proof box; 112. Valve device; 11. First two-way valve; 12. Second two-way valve; 13. Position sensor; 14. Pressure sensor; 15. Inlet of measured fluid; 16. Outlet of measured fluid; 17. Collection pipeline; 171. Collection main pipeline; 172. Collection branch pipeline; 18. Transmission pipeline; 19. Three-way valve; 20. One-way valve. DETAILED DESCRIPTION

[0048] The following is combined with the above Figure 1-4 The preferred implementation scheme and various optional implementation schemes provided by the embodiments of the present invention are described in more detail.

[0049] like Figure 1-4As shown, an embodiment of the present invention provides an intelligent oil, gas and water measuring device, comprising a closed online measuring container (preferably a tank) 1, a valve device 112, a collection pipeline 17 and a transmission pipeline 18, wherein the two ports of the transmission pipeline 18 respectively form a measured fluid inlet 15 and a measured fluid outlet 16, wherein:

[0050] The closed online measurement container 1 is connected to the transmission pipeline 18 via the collection pipeline 17. The valve device 112 is provided on the collection pipeline 17 and the transmission pipeline 18 and can control whether the collection pipeline 17 and the transmission pipeline 18 are conductive.

[0051] When the valve device 112 opens the collection pipeline 17 and closes the transmission pipeline 18 in the section between the collection pipeline 17 and the measured fluid outlet 16, the measured fluid entering from the measured fluid inlet 15 can enter the closed online measurement container 1 through the collection pipeline 17; when the valve device 112 opens the collection pipeline 17 and opens the transmission pipeline 18 in the section between the collection pipeline 17 and the measured fluid outlet 16, the measured fluid in the closed online measurement container 1 can flow out of the measured fluid outlet 16 through the collection pipeline 17 and the transmission pipeline 18.

[0052] The closed online measuring container 1 is provided with an online measuring device, which includes a water level measuring device 4, an oil level measuring device 6, a heating device 7, a temperature measuring device 8 and an air pressure measuring device 3;

[0053] The water level measuring device 4 can measure the water level of the measured fluid in the closed online measuring container 1;

[0054] The oil level measuring device 6 can measure the oil level of the measured fluid in the closed online measuring container 1;

[0055] The heating device 7 can heat the measured fluid in the closed online measuring container 1;

[0056] The temperature measuring device 8 can measure the temperature of the gas and the temperature of the liquid (preferably the temperature of water) in the closed online measurement container 1;

[0057] The air pressure measuring device 3 can measure the air pressure in the closed online measurement container 1 .

[0058] The intelligent oil, gas and water measuring device provided by the present invention uses a closed online measuring container 1, so that the output of the oil well over a period of time is completely gathered in the closed online measuring container 1, and pulsating flow full-cycle sampling is realized, thereby creating conditions for accurately measuring the oil, gas and water content. The heating in the closed container enables the oil, gas and water to be more fully separated and stratified. The combined effect of heating and vibration enables the liquid level to be accurately measured. In addition, the discharge of gas after a measurement is completed effectively clears the substances in the closed container, so the detection accuracy is better.

[0059] As an optional embodiment of the present invention, the valve device 112 in this embodiment may include a first two-way valve 11 and a second two-way valve 12. The first two-way valve 11 is arranged on the collection pipeline 17 and can control whether the collection pipeline 17 is conductive. The second two-way valve 12 is arranged on the section of the transmission pipeline 18 between the collection pipeline 17 and the outlet 16 of the fluid to be measured and can control whether the section of the transmission pipeline 18 between the collection pipeline 17 and the outlet 16 of the fluid to be measured is conductive.

[0060] The valve device 112 uses the first two-way valve 11 and the second two-way valve 12 as hardware, which has the advantages of convenient disassembly, maintenance, and control, high reliability in use, and simple pipeline connection.

[0061] As an optional embodiment of the present invention, in this embodiment, the valve device 112 can be set at the connection between the collection pipeline 17 and the transmission pipeline 18. Figure 2 As shown, the three-way valve 19 is in a first open state, the collection pipeline 17 is connected, and the section of the transmission pipeline 18 between the collection pipeline 17 and the outlet 16 of the fluid to be measured is closed; when the three-way valve is in a second open state, the collection pipeline 17 is connected, and the section of the transmission pipeline 18 between the collection pipeline 17 and the outlet 16 of the fluid to be measured is also connected; when the three-way valve is in a third open state, the collection pipeline is closed, and the section of the transmission pipeline between the collection pipeline and the outlet of the fluid to be measured is connected.

[0062] Compared with the solution in which the valve device 112 uses the first two-way valve 11 and the second two-way valve 12 as hardware, the valve device 112 uses the three-way valve 19, which has the advantages of simple structure and low cost.

[0063] As an optional embodiment of the present invention, the number of the closed online measurement containers 1 is at least two, wherein: Figure 3 The collection pipeline 17 shown includes a main collection pipeline 171 connected to the transmission pipeline 18 and at least two branch collection pipelines 172 connected to the main collection pipeline 171. Each closed online measurement container 1 is connected to the main collection pipeline 171 through a branch collection pipeline 172. When the valve device 112 includes a first two-way valve 11 and a second two-way valve 12, the first two-way valve 11 is provided on the main collection pipeline 171. When the valve device 112 is a three-way valve 19 provided at the connection between the collection pipeline 17 and the transmission pipeline 18, the three-way valve 19 is provided at the connection between the main collection pipeline 171 and the transmission pipeline 18.

[0064] By increasing the number of closed online measurement containers 1, the total capacity is increased, and the range of a single measurement is expanded; Figure 3Two closed online measurement containers 1 are shown, but the number is not limited to two closed online measurement containers 1 , and three or more closed online measurement containers 1 may be connected in parallel.

[0065] As an optional embodiment of the present invention, the number of the closed online measurement containers 1 is at least two, wherein: Figure 4 The number of collection pipelines 17 shown is at least two, and each closed online measurement container 1 is connected to the transmission pipeline 18 through a collection pipeline 17. When the valve device 112 includes a first two-way valve 11 and a second two-way valve 12, each collection pipeline 17 is provided with a first two-way valve 11; when the valve device 112 is a three-way valve 19 arranged at the connection between the collection pipeline 17 and the transmission pipeline 18, each collection pipeline 17 is provided with a three-way valve 19 at the connection between the transmission pipeline 18.

[0066] By adding a closed online measuring container 1, continuous measurement is achieved. When the closed online measuring container 1 on the left is measuring, the closed online measuring container 1 on the right is sampling, and the two processes are performed in turn. Figure 4 Two closed online measurement vessels 1 are shown, but the number is not limited to two; three or more closed online measurement vessels 1 can be connected in parallel. When production is low, the number of closed online measurement vessels 1 is small. With higher production, more closed online measurement vessels 1 can be connected in parallel to achieve continuous measurement.

[0067] As an optional embodiment of the present invention, both the first two-way valve 11 and the second two-way valve 12 in this embodiment are motor-driven ball valves. Compared to solenoid valves, motor-driven ball valves have the advantages of faster opening and closing speeds, less impact on normal oil production, less interference between normal oil transportation and detection, and higher detection accuracy.

[0068] As an optional embodiment of the present invention, the valve device 112 in this embodiment further includes a one-way valve 20, which is disposed on the section of the transmission pipeline 18 between the collection pipeline 17 and the outlet 16 of the measured fluid;

[0069] The one-way valve 20 only allows the measured fluid flowing through it to flow toward the measured fluid outlet 16. The one-way valve 20 is provided with a pressure sensor 14 and a position sensor 13. The pressure sensor 14 can detect the pressure inside the one-way valve 20, and the position sensor 13 can detect whether the one-way valve 20 is open (and the degree of opening).

[0070] The one-way valve 20 can prevent the measured fluid from flowing back and affecting the detection accuracy. The setting of the pressure sensor 14 and the position sensor 13 can detect the working status of the one-way valve 20 in real time, so as to promptly discover problems in the measurement and reduce the accident rate.

[0071] As an optional embodiment of the present invention, in this embodiment, Figure 1 and Figure 2 The temperature measuring device 8 shown includes a temperature measuring rod and a gas temperature measuring chip and a liquid temperature measuring chip distributed at different heights of the temperature measuring rod, and the position height of the gas temperature measuring chip is higher than the position height of the liquid temperature measuring chip; or, the temperature measuring device 8 includes a first temperature measuring rod and a second temperature measuring rod, the bottom end of the first temperature measuring rod is provided with a gas temperature measuring chip, the bottom end of the second temperature measuring rod is provided with a liquid temperature measuring chip, and the length of the first temperature measuring rod is shorter than the length of the second temperature measuring rod.

[0072] Water has a higher density than oil, so it is located at a lower height than oil, so the above design helps to improve detection accuracy.

[0073] As an optional embodiment of the present invention, the water level height measuring device 4 and the oil level height measuring device 6 in this embodiment are both float-type liquid level measuring devices, and the closed online measuring container 1 is also provided with an anti-adhesion vibration device 5. The anti-adhesion vibration device 5 can drive the measured fluid in the closed online measuring container 1 to vibrate to prevent the float used in the float-type liquid level measuring device from adhering to the measured fluid.

[0074] The anti-adhesion vibration device 5 can prevent the float used in the float type liquid level measuring device from adhering to the measured fluid, thereby improving the detection accuracy and the service life of the float type liquid level measuring device.

[0075] As an optional embodiment of the present invention, the anti-adhesion vibration device 5 in this embodiment includes a vibration rod and a vibration mechanism. One end of the vibration rod is fixed on the closed online measurement container 1, and the other end of the vibration rod extends to the bottom of the closed online measurement container 1. The vibration mechanism is arranged at the lower end of the vibration rod.

[0076] The vibrating rod not only serves as a mounting carrier for the vibrating mechanism, but also can release the vibration energy released by the vibrating mechanism into the fluid being measured, thereby effectively preventing the fluid being measured from adhering to the float used in the float-type liquid level measuring device.

[0077] As an optional embodiment of the present invention, the vibration mechanism in this embodiment includes a housing fixed on the vibration rod and a vibration motor fixed in the housing, and a cam is provided on the rotating shaft of the vibration motor.

[0078] The rotating shaft of the vibration motor drives the cam to run, which drives the vibration motor itself and its housing to vibrate, thereby releasing vibration energy. This vibration mechanism has the advantages of easy control and compact structure.

[0079] As an optional embodiment of the present invention, a vibration plate is fixedly mounted on the housing in this embodiment, and extends horizontally out of the housing. The vibration plate can increase the speed and strength of the vibration energy released in the horizontal direction, thereby improving the vibration effect.

[0080] As an optional embodiment of the present invention, the closed online measurement container 1 in this embodiment is a sealed tank body, which includes a tank body, a top cover 2, a power line, a data line ( Figure 1 The midpoint line represents the power line and the data line), the explosion-proof box 10 and the wireless signal transceiver, wherein: the top cover 2 is arranged at the top port of the tank body and seals the top port of the tank body, the power line and the data line are connected to the online measuring device in the tank body through the top cover 2; the explosion-proof box 10 is fixed to the outer wall of the tank body and the explosion-proof box 10 is provided with a power switch, a controller and a display screen 9, the power switch is connected to the power line, the controller is connected to the data line and can display the data detected by the online measuring device through the display screen 9 and can exchange data with the external control center through the wireless signal transceiver, and the data includes the control instructions of the valve device 112 and the control instructions of the online measuring device.

[0081] The above configuration enables the present invention to have remote monitoring, detection and control functions, thereby improving the automation and intelligence level of the present invention.

[0082] As an optional embodiment of the present invention, the heating device 7 in this embodiment is rod-shaped. The rod-shaped heating device 7 has a larger contact area with the measured fluid, which is conducive to increasing the heating speed.

[0083] The measuring method of the intelligent oil, gas and water measuring device according to any of the above technical solutions provided by the present invention comprises the following steps:

[0084] Step A: Connect any intelligent oil, gas and water measuring device in the above technical solutions to an oil pipeline, and use the oil transported in the oil pipeline as the measured fluid;

[0085] Step B: The control valve device 112 opens the collection pipeline 17 and closes the section of the transmission pipeline 18 between the collection pipeline 17 and the measured fluid outlet 16, allowing the measured fluid conveyed by the measured fluid conveying pipeline to enter the measured fluid inlet 15 and enter the closed online measurement container 1 through the collection pipeline 17. When the amount of measured fluid in the closed online measurement container 1 meets the measurement conditions, the control valve device 112 closes the collection pipeline 17 and opens the section of the transmission pipeline 18 between the collection pipeline 17 and the measured fluid outlet 16, allowing the measured fluid to continue to be conveyed through the measured fluid conveying pipeline.

[0086] Step C: Controlling the heating device 7 in the online measurement device to heat the measured fluid in the closed online measurement container 1 so that the oil, gas and water in the measured fluid are separated and stratified; measuring the water level of the measured fluid in the closed online measurement container 1 by the water level measuring device 4; measuring the oil level of the measured fluid in the closed online measurement container 1 by the oil level measuring device 6; measuring the temperature of the liquid and gas in the closed online measurement container 1 by the temperature measuring device 8; and measuring the air pressure in the closed online measurement container 1 by the air pressure measuring device 3;

[0087] Step D: Calculating the respective contents (in fractions by mass) of oil, gas, and water in the measured fluid based on the water level, oil level, temperature, and air pressure values ​​detected by the online measuring device, the pre-known densities of oil, gas, and water, and the corresponding relationships between the volume of the closed online measuring container 1 and the water level, oil level, temperature, and air pressure values; or calculating the respective volume fractions of oil, gas, and water in the measured fluid based on the water level, oil level, temperature, and air pressure values ​​detected by the online measuring device, and the pre-known corresponding relationships between the volume of the closed online measuring container 1 and the water level, oil level, temperature, and air pressure values;

[0088] The present application utilizes a double float measurement system, which utilizes double liquid level rods and two floats of different specific gravities (float 41 and float 61) to measure the liquid level and water level inside the metering tank, thereby obtaining the liquid volume, oil volume, and water volume.

[0089] The gas volume is obtained by subtracting the liquid volume from the total internal volume of the closed online measuring container 1 (tank). The gas volume in the standard state is calculated using the gas state equation in combination with accurate pressure sensors and temperature sensors.

[0090] The float ball for measuring the liquid level is marked as “liquid level float ball”, i.e. float ball 61.

[0091] The float ball for measuring the water level (oil-water interface) is marked as “interface float ball” or float ball 41 .

[0092] 1. Involved variables and pre-calibrated values

[0093] (1) Variables involved:

[0094] Real-time collection volume:

[0095] Lqh1 - Liquid level float, i.e. the measurement value of float 61, represents the actual liquid level in the tank, i.e. the oil level (oil level height).

[0096] Lqh2——Interface float, i.e., the measurement value of float 41, represents the actual water level in the tank, i.e., the liquid level at the oil-water interface (water level height).

[0097] Calculation results:

[0098] Fr_H——total liquid level

[0099] Fr_V——total volume

[0100] Fr_O_H——Oil height Fr_O_V——Oil volume Fr_W_H——Water height Fr_W_V——Water volume

[0101] (2) Pre-calibrated values ​​involved:

[0102] SAV - internal cross-sectional area of ​​the tank in linear increment area;

[0103] VZP - Tank volume below zero liquid level (the oil level measuring device 6 is limited in length and cannot detect the depth range inside the tank)

[0104] 2. Calculation method

[0105] Liquid volume calculation method

[0106] The volume of the float is very small relative to the volume of the tank, so the effect of the float volume on the liquid level can be ignored; according to the actual value range of the water content in the oil field, it can be assumed that the volume of the VZP part is entirely water and does not contain oil.

[0107] ①Liquid level height: Fr_H=Lqh1

[0108] ②Liquid volume: Fr_V=VZP+Lqh1×SAV

[0109] ③ Water level: Fr_W_H=Lqh2

[0110] ④Total volume of water: Fr_W_V=VZP+Lqh2×SAV

[0111] ⑤ Oil layer height: Fr_O_H=Lqh1-Lqh2

[0112] ⑥Total oil volume: Fr_O_V=Fr_O_H×SAV

[0113] Calculation method of gas volume

[0114] The gas volume is calculated according to the modified gas state equation.

[0115] The calculation method is as follows:

[0116] ① Vtotal is the total volume of the tank, then Vtotal minus Fr_V is the volume of the gas in the tank. At this time, the actual measured gas pressure in the tank is Prt, and the temperature is Trt (thermodynamic temperature).

[0117] ②The standard pressure under standard conditions is Pstp and the temperature is Tstp (thermodynamic temperature).

[0118] ③The volume of gas in the tank converted to standard state is:

[0119] Fr_G_V=α×(Vtotal-Fr_V)×Prt×Tstp / (Trt×Pstp)

[0120] Where: α is the compression coefficient (this coefficient can be calculated in the laboratory by collecting a small amount of oil. The specific value is generally between 1 and 1.1. If the numerical accuracy is not required, 1 can be directly selected as the compression coefficient).

[0121] Measurement implementation steps:

[0122] Here, the full tank measurement mode is taken as an example, but the implementation is not limited to the full tank measurement mode. A two-measurement-point mode can also be adopted. The measurement value of the measurement end point is subtracted from the measurement value of the measurement start point to calculate the production value in this time period.

[0123] In this application, the full tank measurement mode is an optimal measurement method, which can fully utilize the volume space of the tank to achieve the maximum measurement range and measurement accuracy.

[0124] The key innovation of the full-tank measurement mode is that it utilizes the gas produced by the oil well and determines the amount of gas at the measurement end point. If the liquid can be completely drained and only gas remains in the tank, the conditions for full-tank measurement are met.

[0125] ①How to determine whether the measurement conditions are met?

[0126] Whether the measurement conditions are met is determined from the time the liquid is introduced to the measurement end point.

[0127] Heat to the target temperature, vibrate to ensure that the float overcomes adhesion and reaches the liquid level, then start measuring, collect the liquid level value (Lqh1, i.e. oil level value), water level value (Lqh2, i.e. water level value), tank internal pressure value (Prt, i.e. air pressure value), tank external pressure value (Pext, i.e. Figure 2 The pressure value measured by the medium pressure sensor 14) and the gas temperature value (Trt) are then used to determine whether the conditions are met; the preset liquid discharge margin pressure ΔP1 and liquid discharge holding pressure ΔP2 are used to calculate the volume if the current gas pressure drops to Pext+ΔP1+ΔP2 in the Prt state. If it is greater than the total volume of the liquid in the current tank (Fr_V), it means that the liquid can be emptied and the measurement conditions are met.

[0128] ②How to measure after determining that the measurement conditions are met?

[0129] After draining the liquid to Pext+ΔP2, close the valve. The pressure value and gas temperature value in the tank are the starting point of measurement. There is only gas in the tank, so calculate the gas volume.

[0130] Open the valve and let the liquid flow to the measurement end point, heat it to the target temperature, and vibrate to ensure that the float overcomes adhesion and reaches the liquid level. Then start measuring and collect the liquid level value (Lqh1, i.e., oil level value), water level value (Lqh2, i.e., water level value), tank internal pressure value (Prt, i.e., air pressure value), tank external pressure value (Pext, i.e., Figure 2 The pressure value measured by the pressure sensor 14) and the gas temperature value (Trt) are calculated at this point, which is the end point of the measurement. The oil, gas and water values ​​at this point are calculated, where the gas volume is subtracted from the gas volume at the measurement starting point, and the measurement result is output.

[0131] Before discharging the liquid, it is necessary to judge again whether the measurement conditions are met according to ①. If they are met, execute ② again. If not, execute ③.

[0132] ③What to do if the measurement conditions are not met?

[0133] If the measurement conditions are not met, the liquid is circulated to the measurement end point. At the measurement end point, it is determined whether the measurement conditions are met. If not, the liquid is released to balance the pressure inside and outside the tank, and then the liquid (the liquid contains gas) is added to the measurement end point. Heat to the target temperature, vibrate to ensure that the float overcomes adhesion and reaches the liquid level position, and then start measuring, collecting the liquid level value (Lqh1, i.e., oil level value), water level value (Lqh2, i.e., water level value), tank internal pressure value (Prt, i.e., air pressure value), tank external pressure value (Pext, i.e., Figure 2 The pressure value measured by the medium pressure sensor 14) and the gas temperature value (Trt) are then determined whether the conditions are met.

[0134] The process of liquid filling, judgment and liquid discharge is repeated until the measurement conditions are met and measurement is performed.

[0135] Step E: The control valve device 112 opens the collection pipeline 17 and the section of the transmission pipeline 18 between the collection pipeline 17 and the measured fluid outlet 16, so that the measured fluid in the closed online measurement container 1 flows out from the measured fluid outlet 16 through the collection pipeline 17 and the transmission pipeline 18.

[0136] The above method can accurately measure the oil, gas and water content in oil without affecting the normal oil production process, thereby providing reliable data support for the reasonable evaluation of the value of oil wells and the formulation of production plans.

[0137] The above technical solutions are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. The present invention does not limit the number of any components or devices (such as a closed online measurement container). In other words, the number of any components or devices can be one, two, or more. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be covered within the scope of protection of the present application.

Claims

1. An intelligent oil, gas and water measuring device, characterized by: It includes a closed online measurement container, a valve device, a collection pipeline and a transmission pipeline, wherein the two ports of the transmission pipeline respectively form the inlet and outlet of the measured fluid, wherein: The closed online measurement container is connected to the transmission pipeline through the collection pipeline, and the valve device is provided on the collection pipeline and the transmission pipeline and can control whether the collection pipeline and the transmission pipeline are conductive; When the valve device opens the collection pipeline and closes the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, the measured fluid entering from the measured fluid inlet can enter the closed online measurement container through the collection pipeline; when the valve device opens the collection pipeline and opens the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, the measured fluid in the closed online measurement container can flow out of the measured fluid outlet through the collection pipeline and the transmission pipeline; The closed online measurement container is provided with an online measurement device, which includes a water level measurement device, an oil level measurement device, a heating device, a temperature measurement device, and an air pressure measurement device; the water level measurement device can measure the water level of the measured fluid in the closed online measurement container; The oil level measuring device can measure the oil level of the measured fluid in the closed online measuring container; The heating device can heat the measured fluid in the closed online measurement container; The temperature measuring device can measure the temperature of the gas and liquid in the closed online measurement container; the air pressure measuring device can measure the air pressure in the closed online measurement container.

2. The intelligent oil, gas and water measuring device according to claim 1, characterized in that: The valve device includes a first two-way valve and a second two-way valve, wherein the first two-way valve is arranged on the collection pipeline and can control whether the collection pipeline is conductive; the second two-way valve is arranged on the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid and can control whether the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is conductive; Alternatively, the valve device is a three-way valve arranged at the connection between the collection pipeline and the transmission pipeline. When the three-way valve is in a first open state, the collection pipeline is connected, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is closed; when the three-way valve is in a second open state, the collection pipeline is connected, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is also connected; when the three-way valve is in a third open state, the collection pipeline is closed, and the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid is connected.

3. The intelligent oil, gas and water measuring device according to claim 2, characterized in that: The number of the closed online measurement containers is at least two, wherein: The collection pipeline includes a collection main pipeline connected to the transmission pipeline and at least two collection branch pipelines connected to the collection main pipeline, and each of the closed online measurement containers is connected to the collection main pipeline through one of the collection branch pipelines; when the valve device includes the first two-way valve and the second two-way valve, the first two-way valve is disposed on the collection main pipeline; when the valve device is a three-way valve disposed at the connection between the collection pipeline and the transmission pipeline, the three-way valve is disposed at the connection between the collection main pipeline and the transmission pipeline; Alternatively, the number of the collection pipelines is at least two, and each of the closed online measurement containers is connected to the transmission pipeline through one of the collection pipelines; when the valve device includes the first two-way valve and the second two-way valve, each of the collection pipelines is provided with a first two-way valve; when the valve device is a three-way valve provided at the connection between the collection pipeline and the transmission pipeline, each of the collection pipelines is provided with a three-way valve at the connection between the collection pipeline and the transmission pipeline.

4. The intelligent oil, gas and water measuring device according to claim 2, characterized in that: The valve device further comprises a one-way valve, which is arranged on a section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid; The one-way valve only allows the measured fluid to flow toward the measured fluid outlet. The one-way valve is provided with a pressure sensor and a position sensor. The pressure sensor can detect the pressure in the one-way valve, and the position sensor can detect whether the one-way valve is open.

5. The intelligent oil, gas and water measuring device according to claim 1, characterized in that: The temperature measuring device includes a temperature measuring rod and a gas temperature measuring chip and a liquid temperature measuring chip distributed at different heights of the temperature measuring rod, wherein the gas temperature measuring chip is located at a higher height than the liquid temperature measuring chip; or, the temperature measuring device includes a first temperature measuring rod and a second temperature measuring rod, wherein the bottom end of the first temperature measuring rod is provided with a gas temperature measuring chip, the bottom end of the second temperature measuring rod is provided with a liquid temperature measuring chip, and the length of the first temperature measuring rod is shorter than the length of the second temperature measuring rod.

6. The intelligent oil, gas and water measuring device according to claim 1, characterized in that: The water level height measuring device and the oil level height measuring device are both float-type liquid level measuring devices. The closed online measuring container is also provided with an anti-adhesion vibration device, which can drive the measured fluid in the closed online measuring container to vibrate to prevent the float used in the float-type liquid level measuring device from adhering to the measured fluid.

7. The intelligent oil, gas and water measuring device according to claim 6, characterized in that: The anti-adhesion vibration device includes a vibration rod and a vibration mechanism. One end of the vibration rod is fixed on the closed online measurement container, and the other end of the vibration rod extends to the bottom of the closed online measurement container. The vibration mechanism is arranged at the lower end of the vibration rod.

8. The intelligent oil, gas and water measuring device according to claim 7, characterized in that: The vibration mechanism includes a shell fixed on the vibration rod and a vibration motor fixed in the shell, and a cam is provided on the rotating shaft of the vibration motor; a vibration plate is also fixed on the shell, and the vibration plate extends outside the shell in the horizontal direction.

9. The intelligent oil, gas and water measuring device according to claim 1, characterized in that: The closed online measurement container is a sealed tank body, which includes a tank body, a top cover, a power cord, a data cable, an explosion-proof box and a wireless signal transceiver, wherein: The top cover is arranged on the top port of the tank body and seals the top port of the tank body. The power cord and the data cord are connected to the online measuring device in the tank body through the top cover. The explosion-proof box is fixed to the outer wall of the tank body and is provided with a power switch, a controller and a display screen. The power switch is connected to the power cord, the controller is connected to the data cord and can display the data detected by the online measuring device through the display screen and can exchange data with an external control center through the wireless signal transceiver. The data includes valve device control instructions and online measuring device control instructions.

10. A measurement method for the intelligent oil, gas and water measuring device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step A: Connecting the intelligent oil, gas and water measuring device according to any one of claims 1 to 9 to an oil pipeline, and using the oil transported by the oil pipeline as the measured fluid; Step B: controlling the valve device to open the collection pipeline and close the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid, so that the measured fluid conveyed by the measured fluid conveying pipeline enters the measured fluid inlet and enters the closed online measurement container through the collection pipeline; when the amount of the measured fluid in the closed online measurement container meets the measurement conditions, controlling the valve device to close the collection pipeline and open the section of the transmission pipeline between the collection pipeline and the outlet of the measured fluid, so that the measured fluid continues to be conveyed through the measured fluid conveying pipeline; Step C: controlling the heating device in the online measurement device to heat the measured fluid in the closed online measurement container so that the oil, gas and water in the measured fluid are separated and stratified; measuring the water level of the measured fluid in the closed online measurement container by the water level measuring device; measuring the oil level of the measured fluid in the closed online measurement container by the oil level measuring device; measuring the temperature of the liquid and gas in the closed online measurement container by the temperature measuring device; and measuring the air pressure in the closed online measurement container by the air pressure measuring device; Step D: Calculate the respective contents of oil, gas and water in the measured fluid based on the water level value, oil level value, temperature value, air pressure value, pre-known densities of oil, gas and water detected by the online measuring device, and the corresponding relationship between the volume of the closed online measuring container and the water level value, oil level value, temperature value and air pressure value; or calculate the respective volume fractions of oil, gas and water in the measured fluid based on the water level value, oil level value, temperature value, air pressure value, pre-known corresponding relationship between the volume of the closed online measuring container and the water level value, oil level value, temperature value and air pressure value; Step E: Control the valve device to open the collection pipeline and open the section of the transmission pipeline between the collection pipeline and the measured fluid outlet, so that the measured fluid in the closed online measuring container flows out of the measured fluid outlet through the collection pipeline and the transmission pipeline.

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