Large-flow Gas-Oil-Water Continuous Separation Device and Quantitative Measurement Method

Abstract

A high-flow gas, oil, and water continuous separation device and quantitative metering method relate to the field of oil and gas field exploitation. The high-flow gas, oil, and water continuous separation device includes a gas, oil, and water separation system, a liquid level monitoring and acquisition system, and a dynamic control and measurement system. The gas, oil, and water separation system includes a transparent glass tube, top and bottom gaskets that seal the top and bottom ends of the glass tube, and a water-blocking, oil-permeable, coated sand layer located on the inner wall of the middle portion of the glass tube. The liquid level monitoring and acquisition system includes a camera for capturing images within the glass tube and identifying the water and oil levels. The dynamic control and measurement system includes a dual pump with a water-drawing plunger connected to the bottom of the glass tube, a dual pump with an oil-drawing plunger connected to the area of the glass tube where the water-blocking, oil-permeable, coated sand layer is located, a flowmeter connected to the top of the glass tube, and a transparent flow guide tube extending from the top to the middle of the glass tube. The high-flow gas, oil, and water continuous separation device and quantitative metering method can control the oil and water levels under high-flow conditions and accurately measure the cumulative liquid phase output.

Description

Technical Field

[0001] The present application relates to the field of oil and gas field exploitation, and in particular to a large-flow gas-oil-water continuous separation device and a quantitative metering method. Background Art

[0002] Fluid displacement technology has been widely used in oil and gas field production due to its ability to effectively increase oil and gas recovery rates. Fluid displacement technology involves injecting fluids (such as carbon dioxide, nitrogen, and water) to displace crude oil and gas from reservoirs, thereby increasing oil and gas production. With the increasing application of fluid displacement technology, research on the flow characteristics of the three-phase fluids of oil, gas, and water during fluid displacement has become increasingly important.

[0003] Conventional fluid displacement physical simulation separation devices primarily focus on separating the gas and liquid phases, but have limitations in gas-oil-water separation and metering. Specifically, these devices typically use weighing or differential pressure gauges to achieve cumulative metering of the liquid phase and flow meters to measure the gas flow rate. However, this method makes it difficult to distinguish between the water and oil phases and can only measure the gas and liquid phases. Furthermore, conventional separation devices and solutions can only meet the requirements of displacement testing for small-scale samples. Their limited space becomes particularly evident when dealing with large-scale samples: when the cumulative liquid production exceeds the volume of the separation device, the cumulative liquid production cannot be accurately measured, affecting the continuous monitoring of gas and liquid during the displacement process. Existing physical simulation devices for displacement are primarily used for the displacement of small-scale samples. The cumulative liquid production during the displacement process is limited, but as the sample size increases, the cumulative liquid production also increases. This requires the separation device to have a larger effective volume to meet the experimental requirements. However, unlimited expansion of the separation device volume not only increases the cost of the equipment but also affects the accuracy of liquid phase metering. Summary of the Invention

[0004] The purpose of this application is to provide a large-flow gas, oil and water continuous separation device and a quantitative metering method, which has the advantages of high phase separation efficiency and processing capacity, and can control the oil liquid level and water liquid level in real time under large flow conditions and accurately measure the cumulative output of the three phases of gas, oil and water.

[0005] This application is implemented as follows:

[0006] The present application provides a large-flow gas, oil and water continuous separation device, which comprises:

[0007] The gas, oil and water separation system comprises a transparent glass tube, a top pad and a bottom pad respectively connecting and sealing the top and bottom ends of the glass tube, and a water-blocking and oil-permeable coated sand layer provided on the inner wall of the middle portion of the glass tube;

[0008] A liquid level monitoring and acquisition system, including a camera for capturing images inside the glass tube and identifying the water and oil levels;

[0009] The dynamic control and measurement system includes a water-drawing plunger double pump, an oil-drawing plunger double pump, a flow meter and a transparent guide tube extending from the top to the middle of the glass tube. The water-drawing plunger double pump is connected to the bottom of the glass tube through a pipeline to adjust the water level in the glass tube. The oil-drawing plunger double pump is connected to the outer wall of the glass tube where a water-blocking and oil-permeable coated sand layer is provided to adjust the oil level in the glass tube. The flow meter is connected to the top of the glass tube through a pipeline to detect the flow velocity and cumulative flow of the gas phase; the bottom of the guide tube is connected to the bottom pad to connect to the outside of the glass tube.

[0010] In some optional embodiments, the inner wall of the glass tube is provided with a super hydrophobic and oleophobic coating, and / or the liquid level monitoring and acquisition system further includes a light source board for providing a light source for the camera to capture images.

[0011] In some optional embodiments, a first sealing ring is provided between the top gasket and the glass tube, and / or a second sealing ring is provided between the bottom gasket and the glass tube.

[0012] In some optional embodiments, a first through hole and a first interface connected to the first through hole are provided on the top gasket, and the flow meter is connected to the first interface via a pipeline.

[0013] In some optional embodiments, a second through hole and a third through hole are provided on the bottom pad, the second through hole and the third through hole are respectively connected to a second interface and a third interface, the pumping plunger double pump is connected to the second interface through a pipeline, and the bottom of the guide tube is connected to the third through hole.

[0014] In some optional embodiments, the outer wall of the glass tube where the water-blocking and oil-permeable coated sand layer is provided is connected to a fourth interface, and the oil pumping plunger double pump is connected to the fourth interface through a pipeline.

[0015] The present application also provides a quantitative metering method for a large-flow gas, oil and water continuous separation device, comprising the following steps:

[0016] Step 1: Inject a certain amount of water and oil into the glass tube to form an oil level and a water level arranged at intervals above and below as a reference, so that the oil pump plunger double pump connected to the glass tube is located between the oil level and the water level, use the camera to capture the image in the glass tube and identify the water level and oil level height, and correct the water level and oil level height recognized by the camera image according to the reference oil level and water level measured height to obtain the real-time changing water level height in the glass tube h 1 and oil level h 2;

[0017] Step 2: Use the water pump and oil pump to selectively pump water and oil out of or into the glass tube, and record the water level in the glass tube at the initial moment. h 1 (0) and oil level h 2 (0) ;

[0018] Step 3: Pass the gas-oil-water mixed fluid to be tested into the glass tube, and discharge the gas phase from the top of the glass tube. Monitor the flow rate of the discharged gas phase and the height change data of the water liquid level and the oil liquid level in the glass tube. Based on the monitored height change data, control the unidirectional cumulative displacement of the pistons of the water pumping plunger dual pump and the oil pumping plunger dual pump to keep the heights of the water liquid level and the oil level constant;

[0019] Step 4: Calculate the cumulative flow rate of the water phase and the cumulative flow rate of the oil phase based on the cumulative displacement of the pistons of the water-drawing plunger double pump and the oil-drawing plunger double pump in one direction and the height change data of the water level and the oil level in the glass tube.

[0020] In some optional embodiments, the water level and oil level recognized by the camera image are corrected according to the reference oil level and water level measured height to obtain the real-time changing water level in the glass tube. h 1 and oil level h 2, the following formula is used:

[0021] ;

[0022] Where, h ref1 is the measured height of the water level in the glass tube under the reference state, cm; h ref2 is the measured height of the oil level in the glass tube under the reference state, cm; D is the total height of the identification area between the top and bottom spacers in the glass tube, cm; D 1 is the water level height recognized by the camera image, cm; D 2 is the oil level height recognized by the camera image, in cm.

[0023] In some optional embodiments, the cumulative displacement of the unidirectional motion of the piston of the water-pumping plunger dual pump is controlled according to the following formula to keep the height of the water level constant:

[0024] ;

[0025] Where, u 1 (i) for i Cumulative displacement of the piston of the double pump in one direction at a time, cm; k 1. k 2 andk 3 is the coefficient for controlling the response speed of the double pump piston, obtained through actual testing; h 1 (i) for i The height of the water level at the moment, cm;

[0026] The cumulative displacement of the piston unidirectional motion of the oil pump plunger double pump is controlled according to the following formula to keep the oil level constant:

[0027] ;

[0028] Where, u 2 (i) for i Cumulative displacement of the piston of the double pump in one direction at a time, cm; m 1. m 2 and m 3 is the coefficient for controlling the response speed of the double pump piston of the oil pumping plunger, obtained through actual testing; h 2 (i) is the oil level height at time i, cm.

[0029] In some optional embodiments, the cumulative flow rate of the aqueous phase is calculated using the following formula: V 1 (i) :

[0030] ;

[0031] Where, u 1 (i) for i Cumulative displacement of the piston of the double pump in one direction at a time, cm; A is the cross-sectional area of a single piston chamber of a double-piston pump, cm 2 ; S is the cross-sectional area of the glass tube, cm 2 ;

[0032] Use the following formula to calculate the cumulative flow rate of the oil phase V 2 (i) :

[0033] ;

[0034] Where, u 2 (i) is the cumulative displacement of the piston of the double pump in one direction at time i, cm; A is the cross-sectional area of a single piston chamber of a double-piston pump, cm 2 ; S is the cross-sectional area of the glass tube, cm 2 .

[0035] The beneficial effects of the present application are as follows: the large-flow gas-oil-water continuous separation device and quantitative metering method provided by the present application correct the water level and oil level heights recognized by the camera image according to the actual measured heights of the oil level and water level in the glass tube as a reference to obtain the real-time changing water level and oil level heights in the glass tube, and then the gas-oil-water mixed fluid to be tested is passed into the glass tube and the gas phase is discharged to detect the flow rate, and the water and oil are selectively pumped out or passed into the glass tube using a water pumping plunger double pump and an oil pumping plunger double pump, based on the monitored water and oil The height change data of the surface and the oil level are used to control the unidirectional motion cumulative displacement of the pistons of the water pumping plunger double pump and the oil pumping plunger double pump to keep the heights of the water level and the oil level constant. Finally, the cumulative flow rate of the water phase and the cumulative flow rate of the oil phase are calculated according to the unidirectional cumulative displacement of the pistons of the water pumping plunger double pump and the oil pumping plunger double pump and the height change data of the water level and the oil level in the glass tube. The system has the advantages of high phase separation efficiency and processing capacity, and can control the oil level and the water level to be constant in real time under large flow conditions and accurately measure the cumulative output of the three-phase gas, oil and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of the structure of a large-flow gas, oil and water continuous separation device provided in an embodiment of the present application;

[0038] Figure 2 This is a logical diagram of the quantitative metering method of the large-flow gas, oil and water continuous separation device provided in an embodiment of the present application.

[0039] In the figure: 100, gas, oil and water separation system; 110, glass tube; 120, top gasket; 121, first through hole; 122, first interface; 130, bottom gasket; 131, second through hole; 132, third through hole; 133, second interface; 134, third interface; 140, water-blocking and oil-permeable coated sand layer; 150, super-hydrophobic and oleophobic coating; 160, first sealing ring; 170, second sealing ring; 180, fourth interface; 200, liquid level monitoring and acquisition system; 210, camera; 220, light source board; 300, dynamic control and measurement system; 310, water pumping plunger double pump; 320, oil pumping plunger double pump; 330, flow meter; 340, flow guide tube. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0045] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] The features and performance of the large-flow gas-oil-water continuous separation device and quantitative metering method of the present application are further described in detail below in conjunction with the embodiments.

[0048] like Figure 1 As shown, the embodiment of the present application provides a large flow gas, oil and water continuous separation device, which includes a gas, oil and water separation system 100, a liquid level monitoring and acquisition system 200 and a dynamic control and measurement system 300;

[0049] The gas-oil-water separation system 100 includes a vertically arranged transparent glass tube 110, a top gasket 120 and a bottom gasket 130 that can be respectively clamped and sealed at the top and bottom ends of the glass tube 110, and a water-blocking and oil-permeable coated sand layer 140 provided on the inner wall of the middle part of the glass tube 110. The inner wall of the glass tube 110 is provided with a super-hydrophobic and oleophobic coating 150, a first sealing ring 160 is provided between the top gasket 120 and the glass tube 110, and a second sealing ring 170 is provided between the bottom gasket 130 and the glass tube 110. 0, the top spacer 120 is provided with a first through hole 121 communicating with the top of the glass tube 110 and a first interface 122 connected to the first through hole 121, the bottom spacer 130 is provided with a second through hole 131 and a third through hole 132 communicating with the bottom of the glass tube 110, the second through hole 131 and the third through hole 132 are respectively connected to a second interface 133 and a third interface 134, and the outer wall of the glass tube 110 where the water-blocking and oil-permeable coated sand layer 140 is provided is provided with a fourth interface 180 communicating with the middle portion of the glass tube 110.

[0050] The liquid level monitoring and acquisition system 200 includes a camera 210 and a light source board 220 arranged opposite to the camera 210. The camera 210 is used to acquire images in the glass tube 110 and identify the water level and the oil level. The light source board 220 is used to provide light for the camera 210 to acquire images.

[0051] The dynamic control and measurement system 300 includes a water-suctioning plunger dual pump 310, an oil-suctioning plunger dual pump 320, a flowmeter 330, and a transparent flow guide tube 340. The water-suctioning plunger dual pump 310 is connected to the second interface 133 via a pipeline to adjust the water level at the bottom of the glass tube 110. The oil-suctioning plunger dual pump 320 is connected to the outer wall of the glass tube 110 at the location where the water-blocking and oil-permeable coated sand layer 140 is provided via a pipeline to adjust the oil level in the middle of the glass tube 110. The flowmeter 330 is connected to the first interface 122 via a pipeline to discharge the gas phase at the top of the glass tube 110 and detect the flow rate and cumulative flow of the gas phase. The bottom of the flow guide tube 340 is connected to the bottom gasket 130 to connect the third through hole 132 and the outside of the glass tube 110. The top of the flow guide tube 340 extends to the middle of the glass tube 110.

[0052] like Figure 2 As shown, the embodiment of the present application also provides a quantitative metering method for continuous separation of large-flow gas, oil and water, comprising the following steps:

[0053] 13. The oil level in the glass tube 110 is adjusted to the desired level. h 1 and oil level h 2:

[0054] ;

[0055] Where, h ref1 is the measured height of the water level in the glass tube 110 under the reference state, cm; h ref2 is the measured height of the oil level in the glass tube 110 under the reference state, cm; D is the total height of the identification area between the top spacer 120 and the bottom spacer 130 in the glass tube 110, in cm; D 1 is the water level height of the image captured by the camera 210, in cm; D 2 is the oil level height recognized by the image captured by the camera 210, in cm;

[0056] Step 2: Control the water pumping plunger dual pump 310 and the oil pumping plunger dual pump 320 to start selectively pumping water and oil out of or into the glass tube 110, and record the real-time change of the water level in the glass tube 110 at the initial moment. h 1 (0) and oil level h 2 (0) ;

[0057] Step 3: The gas-oil-water mixed fluid to be tested is introduced into the glass tube 110 through the third interface 134, the third through hole 132, and the flow guide tube 340, so that the gas phase is discharged from the first through hole 121 and the first interface 122 at the top of the glass tube 110. The flow rate and cumulative flow of the gas phase are monitored using the flow meter 330. At the same time, the height change data of the water level and the oil level in the glass tube 110 are monitored. Based on the monitored height change data, the unidirectional cumulative displacement of the pistons of the water pumping plunger dual pump 310 and the oil pumping plunger dual pump 320 is controlled to maintain constant heights of the water level and the oil level.

[0058] The cumulative displacement of the unidirectional movement of the piston of the water-pumping plunger dual pump 310 is adjusted according to the following formula:

[0059] ;

[0060] Where, u 1 (i) for i Cumulative displacement of the piston of the water-pumping double pump 310 in one direction at a time, cm; k 1. k 2 and k 3 is the coefficient for controlling the response speed of the piston of the water-pumping double-piston pump 310, obtained through actual testing; h 1 (i) for i The height of the water level at the moment, cm;

[0061] The cumulative displacement of the piston unidirectional movement of the oil pumping plunger dual pump 320 is adjusted according to the following formula:

[0062] ;

[0063] Where, u 2 (i) for i Cumulative displacement of the piston of the oil pumping plunger dual pump 320 in one direction at a time, cm; m 1. m 2 and m 3 is the coefficient for controlling the response speed of the 320 piston of the oil pumping plunger double pump, obtained through actual testing; h 2 (i) is the oil level height at time i, cm.

[0064] Step 4: Calculate the cumulative flow rate of the water phase and the cumulative flow rate of the oil phase based on the cumulative displacement of the pistons of the water pumping plunger dual pump 310 and the oil pumping plunger dual pump 320 and the height change data of the water level and the oil level in the glass tube 110.

[0065] The cumulative flow rate of the water phase is calculated using the following formula V 1 (i) :

[0066] ;

[0067] Where, u 1 (i) for i Cumulative displacement of the piston of the water-pumping double pump 310 in one direction at a time, cm; A is the cross-sectional area of a single piston chamber of the water-pumping double piston pump 310, cm 2 ; S is the cross-sectional area of the glass tube 110, cm 2 ;

[0068] Use the following formula to calculate the cumulative flow rate of the oil phase V 2 (i) :

[0069] ;

[0070] Where, u 2 (i) is the cumulative displacement of the piston of the oil pumping plunger dual pump 320 in one direction at time i, cm; A is the cross-sectional area of a single piston chamber of the oil pumping plunger dual pump 320, cm 2 ; S is the cross-sectional area of the glass tube 110, cm 2 .

[0071] The large-flow gas-oil-water continuous separation device and quantitative metering method provided in the embodiment of the present application are provided with a glass tube 110 with closed ends in the gas-oil-water separation system 100 to accommodate the three-phase fluid of gas, oil and water, and use the water pumping plunger dual pump 310, the oil pumping plunger dual pump 320 and the flow meter 330 of the dynamic control and measurement system 300 to respectively perform the extraction and separation operations of the three phases of water, oil and gas, and use the camera 210 to collect the image inside the glass tube 110 and identify the oil liquid level and the water liquid level and then feedback the height signal, and correct the oil liquid level and the water liquid level height that the camera 210 collects and identifies according to the reference oil liquid level and water liquid level height, and then control the water pumping plunger dual pump 310, the oil pumping plunger dual pump 320 and the flow meter 330 according to the reference oil liquid level and water liquid level height, and then control the water pumping plunger dual pump 310, the oil pumping plunger dual pump 320 and the flow meter 330 according to the dynamic control and measurement system 300 to respectively perform the extraction and separation operations of the three phases of water, oil and gas, and use the camera 210 to collect the image inside the glass tube 110 and identify the oil liquid level and the water liquid level and then feedback the height signal, and correct the oil liquid level and the water liquid level height that the camera 210 collects and identifies according to the reference oil liquid level and water liquid level height, and then control the water pumping plunger dual pump 310, the oil pumping plunger dual pump 320 and the flow meter 330 ... The piston movement displacement of the pump 310 and the oil pumping plunger dual pump 320 is used to ensure the constancy of the oil level and the water level during the separation process, and then the cumulative flow rate of the oil phase and the water phase is accurately calculated according to the height change of the oil level and the water level and the cumulative displacement of the unidirectional movement of the pistons of the water pumping plunger dual pump 310 and the oil pumping plunger dual pump 320, thereby realizing the continuous separation and precise measurement of the "gas-oil-water three-phase fluid". The large-flow gas-oil-water continuous separation device and quantitative measurement method provided in the embodiment of the present application can break through the size limitation of the separation device itself to realize large-flow "gas-oil-water" continuous separation and measurement, and can ensure the measurement accuracy of each phase fluid, providing a technical basis for understanding the migration law of each component fluid in the displacement and replacement physical simulation process.

[0072] The inner wall of the glass tube 110 is provided with a super-hydrophobic and oleophobic coating 150, which effectively prevents oil and water droplets from clinging to the wall during the separation process, thus avoiding image recognition errors. A water-blocking and oil-permeable coated sand layer 140 on the central inner wall of the glass tube 110 prevents water from flowing through the fourth port 180 and into the pumping plunger dual pump 320 for extraction, thereby ensuring the metering accuracy of the oil-phase fluid. The top of the flow guide 340 extends to the central interior of the glass tube 110, effectively preventing gas from flowing toward the water and oil extraction ports, thereby ensuring the metering accuracy of the gas-phase fluid.

[0073] In this embodiment, the cumulative displacement of the unidirectional motion of the pistons of the water-pumping plunger dual pump 310 and the oil-pumping plunger dual pump 320 refers to: the sum of the distances that the two pistons in the water-pumping plunger dual pump 310 and the oil-pumping plunger dual pump 320 move unidirectionally along the piston cavity. For example, the distance that a piston in the water-pumping plunger dual pump 310 moves unidirectionally along the piston cavity once is L, and the distance L that the piston moves back and forth along the piston cavity to reset is not included in the cumulative displacement of the unidirectional motion of the piston. Therefore, the cumulative displacement of the unidirectional motion of a piston in the water-pumping plunger dual pump 310 that moves back and forth n times along the piston cavity is nL, where n is a positive integer greater than or equal to 1. The sum of the distances that the two pistons in the water-pumping plunger dual pump 310 move unidirectionally along the piston cavity is the cumulative displacement of the unidirectional motion of the piston of the water-pumping plunger dual pump 310.

[0074] In this embodiment, the water level and the oil level are both measured and identified using the top surface of the bottom pad 130 as a reference surface.

[0075] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A quantitative metering method for a large-flow gas, oil and water continuous separation device, characterized in that: The method is carried out using a large-flow gas, oil and water continuous separation device, which includes: The gas, oil and water separation system comprises a transparent glass tube, a top pad and a bottom pad respectively connecting and sealing the top and bottom ends of the glass tube, and a water-blocking and oil-permeable coated sand layer provided on the inner wall of the middle portion of the glass tube; a liquid level monitoring and acquisition system, comprising a camera for acquiring images of the interior of the glass tube and identifying the heights of the water and oil levels; A dynamic control and measurement system includes a water-drawing plunger dual pump, an oil-drawing plunger dual pump, a flowmeter, and a transparent flow guide tube extending from its top to the middle of the glass tube. The water-drawing plunger dual pump is connected to the bottom of the glass tube via a pipeline to adjust the water level in the glass tube. The oil-drawing plunger dual pump is connected to the outer wall of the glass tube where the water-blocking and oil-permeable coated sand layer is provided via a pipeline to adjust the oil level in the glass tube. The flowmeter is connected to the top of the glass tube via a pipeline to detect the flow velocity and cumulative flow of the gas phase. The bottom of the flow guide tube is connected to the bottom gasket to connect to the outside of the glass tube. The quantitative metering method of a large-flow gas, oil and water continuous separation device includes the following steps: Step 1: Inject a certain amount of water and oil into the glass tube to form an oil level and a water level spaced apart from each other as a reference, connect the oil pump plunger double pump to the glass tube and locate it between the oil level and the water level, use a camera to capture an image in the glass tube and identify the water level and the oil level height, and correct the water level and the oil level height recognized by the camera capture image according to the actual measured height of the reference oil level and the water level to obtain the real-time changing water level height in the glass tube. h 1 and oil level h 2; Step 2: Use the water pumping plunger double pump and the oil pumping plunger double pump to selectively pump water and oil out of or into the glass tube, and record the water level in the glass tube at the initial moment. h 1 (0) and oil level h 2 (0) ; Step 3: Passing a gas-oil-water mixed fluid to be tested into the glass tube, and discharging the gas phase from the top of the glass tube, monitoring the flow rate of the discharged gas phase and the height change data of the water level and the oil level in the glass tube, and controlling the unidirectional cumulative displacement of the pistons of the water pumping plunger double pump and the oil pumping plunger double pump based on the monitored height change data to keep the heights of the water level and the oil level constant; the unidirectional cumulative displacement of the pistons of the water pumping plunger double pump and the oil pumping plunger double pump refers to the sum of the distances moved unidirectionally by the two pistons in the water pumping plunger double pump and the oil pumping plunger double pump along the piston chamber; Step 4: Calculate the cumulative flow rate of the water phase and the cumulative flow rate of the oil phase based on the cumulative displacement of the pistons of the water pumping plunger double pump and the oil pumping plunger double pump in one direction and the height change data of the water level and the oil level in the glass tube.

2. The quantitative metering method of the large-flow gas, oil and water continuous separation device according to claim 1 is characterized in that: The inner wall of the glass tube is provided with a super hydrophobic and oleophobic coating, and / or the liquid level monitoring and acquisition system further comprises a light source board for providing a light source for the camera to acquire images.

3. The quantitative metering method of the large-flow gas, oil and water continuous separation device according to claim 1 is characterized in that: A first sealing ring is provided between the top gasket and the glass tube, and / or a second sealing ring is provided between the bottom gasket and the glass tube.

4. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 1, characterized in that: The top cushion block is provided with a first through hole and a first interface connected to the first through hole, and the flow meter is connected to the first interface through a pipeline.

5. The quantitative metering method of the large-flow gas, oil and water continuous separation device according to claim 1 is characterized in that: The bottom pad is provided with a second through hole and a third through hole, the second through hole and the third through hole are respectively connected to a second interface and a third interface, the pumping plunger double pump is connected to the second interface through a pipeline, and the bottom of the guide pipe is connected to the third through hole.

6. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 1, characterized in that: The outer wall of the glass tube where the water-blocking and oil-permeable coated sand layer is provided is connected to a fourth interface, and the oil pumping plunger double pump is connected to the fourth interface through a pipeline.

7. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 1, characterized in that: The water level and oil level heights recognized by the camera image are corrected according to the reference oil level and water level measured heights to obtain the real-time changing water level height in the glass tube. h 1 and oil level h 2, the following formula is used: ； Where, h ref1 is the measured height of the water level in the glass tube under the reference state, cm; h ref2 is the measured height of the oil level in the glass tube under the reference state, cm; D is the total height of the identification area between the top and bottom pads in the glass tube, cm; D 1 is the water level height recognized by the camera image, cm; D 2 is the oil level height recognized by the camera image, in cm.

8. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 1, characterized in that: The cumulative displacement of the piston unidirectional motion of the water-pumping plunger double pump is controlled according to the following formula to keep the height of the water level constant: ； Where, u 1 (i) for i Cumulative displacement of the piston of the double pump in one direction at the moment, cm; k 1. k 2 and k 3 is a coefficient for controlling the response speed of the water pumping plunger dual pump piston, obtained through actual testing; h 1 (i) for i The height of the water level at the moment, cm; The cumulative displacement of the piston of the oil pumping plunger double pump in one direction is controlled according to the following formula to keep the oil level constant: ； Where, u 2 (i) for i Cumulative displacement of the piston of the double pump in one direction at the moment, cm; m 1. m 2 and m 3 is a coefficient for controlling the response speed of the oil pumping plunger dual pump piston, obtained through actual testing; h 2 (i) is the oil level height at time i, cm.

9. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 1, characterized in that: The cumulative flow rate of the water phase is calculated using the following formula V 1 (i) : ； Where, u 1 (i) for i Cumulative displacement of the piston of the double pump in one direction at the moment, cm; A is the cross-sectional area of a single piston chamber of the water-pumping double piston pump, cm 2 ; S is the cross-sectional area of the glass tube, cm 2 ; Use the following formula to calculate the cumulative flow rate of the oil phase V 2 (i) : ； Where, u 2 (i) is the cumulative displacement of the piston of the double pump in one direction at time i, in cm; A is the cross-sectional area of a single piston chamber of a double-piston pump, cm 2 ; S is the cross-sectional area of the glass tube, cm 2 .

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