Large-flow gas-oil-water continuous separation device and quantitative metering method

Abstract

The invention discloses a large-flow gas-oil-water continuous separation device and a quantitative metering method, and relates to the field of oil-gas field exploitation. The large-flow gas-oil-water continuous separation device comprises a gas-oil-water separation system, a liquid level monitoring and collecting system and a dynamic control and measurement system. The gas-oil-water separation system comprises a transparent glass tube, a top cushion block, a bottom cushion block and a water-blocking oil-permeable precoated sand layer, wherein the top cushion block and the bottom cushion block are used for sealing the top end and the bottom end of the glass tube, and the water-blocking oil-permeable precoated sand layer is arranged on the inner wall of the middle of the glass tube. The liquid level monitoring and collecting system comprises a camera used for collecting images in the glass tube and recognizing the water liquid level and the oil liquid level. The dynamic control and measurement system comprises a water pumping plunger double pump communicated with the bottom of the glass tube, an oil pumping plunger double pump communicated with the glass tube and provided with a water-blocking oil-permeable precoated sand layer, a flowmeter communicated with the top of the glass tube and a transparent flow guide tube with the top extending to the middle of the glass tube. According to the large-flow gas-oil-water continuous separation device and the quantitative metering method, the oil liquid level and the water liquid level can be controlled under the large-flow condition, and the liquid phase accumulated yield can be accurately metered.

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] In the process of oil and gas field exploitation, fluid displacement technology has been widely used because it can effectively improve the recovery rate of oil and gas. It is to inject fluids (such as carbon dioxide, nitrogen, water, etc.) to displace the crude oil / gas in the oil / gas reservoir to increase oil and gas production. With the in-depth application of fluid displacement technology, the study of the flow characteristics of the three-phase fluid of oil, gas and water in the fluid displacement process has become increasingly important.

[0003] Traditional fluid displacement physical simulation separation devices mainly focus on the separation of gas phase and liquid phase, and have certain limitations in the separation and measurement of gas-oil-water. Specifically, these devices usually use weighing method or differential pressure gauge to realize the cumulative measurement of liquid phase fluid, and use flow meter to realize the flow rate measurement of gas phase, but this method is difficult to distinguish between water phase and oil phase, and can only measure gas phase and liquid phase; In addition, traditional separation devices and schemes can only meet the displacement test requirements of small-sized samples, and their limited space limitations become particularly obvious when facing large-sized samples: when the cumulative liquid production exceeds the volume of the separation device, the cumulative production of the liquid phase cannot be accurately measured, which affects the continuous monitoring of gas and liquid during the displacement process. At the same time, the existing physical simulation devices for displacement are mainly used for the displacement of small-sized samples. The cumulative liquid production during the displacement process is limited, but as the sample size increases, the cumulative liquid production will also increase accordingly, which requires the separation device to have a larger effective volume to meet the test requirements; However, unlimited increase in the volume of the separation device will not only increase the cost of the equipment, but also affect the accuracy of liquid phase measurement. Summary of the invention

[0004] The purpose of the present 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 connected to and sealing the top and bottom ends of the glass tube, and a water-blocking and oil-permeable film sand layer arranged on the inner wall of the middle part of the glass tube;

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

[0009] The dynamic control and measurement system comprises 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 a 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 through a pipeline 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 accumulated flow of the gas phase. The bottom of the guide tube is connected to a 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 acquire 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 pipe 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 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-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 up and down 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 a camera to collect images 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 image according to the reference oil level and the water level measured height to obtain the real-time changing water level height h1 and oil level height h2 in the glass tube;

[0017] Step 2: Use a water-drawing plunger double pump and an oil-drawing plunger double pump to selectively draw water and oil out of or into the glass tube, and record the water level h1(0) and oil level h2(0) in the glass tube at the initial moment;

[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 level and the oil level in the glass tube, and control the unidirectional motion 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 make the height of the water 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 unidirectional motion of the pistons of the water-drawing plunger double pump and the oil-drawing plunger double pump and the height change data of the water level and the oil level in the glass tube.

[0020] In some optional implementation schemes, the water level and oil level heights identified by the camera captured image are corrected according to the reference oil level and water level measured heights to obtain the real-time changing water level height h1 and oil level height h2 in the glass tube using the following formula:

[0021]

[0022] In the formula, 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 pad and the bottom pad in the glass tube, cm; D1 is the water level height recognized by the image captured by the camera, cm; D2 is the oil level height recognized by the image captured by the camera, cm.

[0023] In some optional embodiments, 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:

[0024]

[0025] Where, u1(i) is the cumulative displacement of the piston of the water-pumping plunger double pump in one direction at time i, cm; k1, k2 and k3 are the coefficients for controlling the speed of the piston response of the water-pumping plunger double pump, obtained through actual tests; h1(i) is the height of the water level at time i, 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 height of the oil level constant:

[0027]

[0028] Wherein, u2(i) is the cumulative displacement of the piston of the oil pumping plunger double pump in one direction at time i, cm; m1, m2 and m3 are the coefficients for controlling the response speed of the piston of the oil pumping plunger double pump, which are obtained through actual tests; h2(i) is the oil level height at time i, cm.

[0029] In some optional embodiments, the cumulative flow rate V1(i) of the aqueous phase is calculated using the following formula:

[0030]

[0031] Where u1(i) is the cumulative displacement of the piston of the double pump at time i, cm; A is the cross-sectional area of ​​a single piston chamber of the double pump, cm 2 ; S is the cross-sectional area of ​​the glass tube, cm 2 ;

[0032] The cumulative flow rate V2(i) of the oil phase is calculated using the following formula:

[0033]

[0034] Where, u2(i) is the cumulative displacement of the piston of the oil pumping plunger double pump in one direction at time i, cm; A is the cross-sectional area of ​​a single piston cavity of the oil pumping plunger double 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 measured heights of the oil level and water level in the glass tube as references, and obtain the real-time changing water level and oil level heights in the glass tube, and then pass the gas-oil-water mixed fluid to be tested into the glass tube and then discharge the gas phase detection flow, and 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, based on the monitored water-liquid 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 make the heights of the water liquid level and the oil liquid 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 motion 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 liquid level and the oil liquid level in the glass tube. This method has the advantages of strong phase separation efficiency and processing capacity, and can control the oil liquid level and the water liquid 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 drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying 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 A logical schematic diagram of a quantitative metering method for a 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 pad; 121, first through hole; 122, first interface; 130, bottom pad; 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here 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 which protection is sought, 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 the field 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, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates 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 collection 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 pad 120 and a bottom pad 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 pad 120 and the glass tube 110, and a second sealing ring 170 is provided between the bottom pad 130 and the glass tube 110. 0, the top cushion block 120 is provided with a first through hole 121 connected to the top of the glass tube 110 and a first interface 122 connected to the first through hole 121, the bottom cushion block 130 is provided with a second through hole 131 and a third through hole 132 connected to 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 connected to the middle 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-suction plunger dual pump 310, an oil-suction plunger dual pump 320, a flow meter 330 and a transparent flow guide tube 340. The water-suction plunger dual pump 310 is connected to the second interface 133 through a pipeline to adjust the water level at the bottom of the glass tube 110. The oil-suction plunger dual pump 320 is connected to the outer wall of the glass tube 110 where the water-blocking and oil-permeable coated sand layer 140 is provided through a pipeline to adjust the oil level in the middle of the glass tube 110. The flow meter 330 is connected to the first interface 122 through a pipeline to discharge the gas phase at the top of the glass tube 110 and detect the flow velocity and cumulative flow of the gas phase; the bottom of the flow guide tube 340 is connected to the bottom pad 130 to connect the third through hole 132 and the outside of the glass tube 110, and 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] Step 1: Assemble the above-mentioned large-flow gas-oil-water continuous separation device, inject a certain amount of water and oil into the glass tube 110 through the external pipeline through the third interface 134 and the third through hole 132 using the transparent guide tube 340, so that the oil is attached to the water surface to form an oil liquid surface and a water liquid surface arranged up and down as a reference, wherein the oil liquid surface is the interface between the gas phase and the oil phase, and the water liquid surface is the interface between the oil phase and the water phase, and the water-blocking and oil-permeable coated sand layer 140 is located between the oil liquid surface and the water liquid surface, and the oil pumping plunger double pump 32 0 connects the glass tube 110 to the water-blocking and oil-permeable coated sand layer 140 between the oil level and the water level, turns on the light source board 220 to provide light for the camera 210, uses the camera 210 to collect images in the glass tube 110 and recognize the water level height and the oil level height, and corrects the water level and the oil level height recognized by the camera 210 according to the reference oil level and the measured water level height to obtain the real-time changing water level height h1 and oil level height h2 in the glass tube 110:

[0054]

[0055] In the formula, 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 pad 120 and the bottom pad 130 in the glass tube 110, cm; D1 is the height of the water level identified by the image captured by the camera 210, cm; D2 is the height of the oil level identified by the image captured by the camera 210, cm;

[0056] Step 2: Control the water-drawing plunger dual pump 310 and the oil-drawing plunger dual pump 320 to start selectively drawing water and oil out of or into the glass tube 110, respectively, and record the real-time changing water level height h1(0) and oil level height h2(0) in the glass tube 110 at the initial moment;

[0057] Step 3: Pass the gas-oil-water mixed fluid to be tested 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, use the flow meter 330 to monitor the flow rate and cumulative flow of the gas phase, and monitor the height change data of the water liquid level and the oil liquid level in the glass tube 110 at the same time, and control the unidirectional motion cumulative displacement of the pistons of the water pumping plunger double pump 310 and the oil pumping plunger double pump 320 based on the monitored height change data to keep the height of the water liquid level and the oil liquid level constant;

[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] Wherein, u1(i) is the cumulative displacement of the piston of the water-pumping plunger dual pump 310 in one direction at time i, cm; k1, k2 and k3 are coefficients for controlling the speed of the piston response of the water-pumping plunger dual pump 310, obtained through actual tests; h1(i) is the height of the water level at time i, cm;

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

[0062]

[0063] Wherein, u2(i) is the cumulative displacement of the piston of the pumping plunger double pump 320 in one direction at time i, cm; m1, m2 and m3 are coefficients for controlling the response speed of the piston of the pumping plunger double pump 320, which are obtained through actual tests; h2(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-drawing plunger dual pump 310 and the oil-drawing 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 V1(i) of the water phase is calculated using the following formula:

[0066]

[0067] Wherein, u1(i) is the cumulative displacement of the piston of the water-pumping plunger dual pump 310 in one direction at time i, cm; A is the cross-sectional area of ​​a single piston cavity of the water-pumping plunger dual pump 310, cm 2 ; S is the cross-sectional area of ​​the glass tube 110, cm 2 ;

[0068] The cumulative flow rate V2(i) of the oil phase is calculated using the following formula:

[0069]

[0070] Wherein, u2(i) is the cumulative displacement of the piston of the pumping plunger dual pump 320 in one direction at time i, cm; A is the cross-sectional area of ​​a single piston cavity of the 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 contain a three-phase fluid of gas, oil and water, and use a water-pumping plunger double pump 310, an oil-pumping plunger double pump 320, and a flowmeter 330 of a dynamic control and measurement system 300 to respectively perform extraction and separation operations of the three phases of water, oil and gas, and use a camera 210 to collect an image of the inside of the glass tube 110 and identify the oil and water levels and then feed back a height signal, and correct the oil and water levels that are identified by the camera 210 according to the reference oil and water levels, and then control the water-pumping plunger double pump 310, an oil-pumping plunger double pump 320, and a flowmeter 330 according to the reference oil and water levels. The piston movement displacement of the pump 310 and the 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 pumping plunger dual pump 310 and the pumping plunger dual pump 320, so as to realize the continuous separation and precise metering of the "gas-oil-water three-phase fluid". The large-flow gas-oil-water continuous separation device and quantitative metering method provided in the embodiment of the present application can break through the size limitation of the separation device itself to realize the large-flow "gas-oil-water" continuous separation and metering, and can ensure the metering accuracy of each phase fluid, providing a technical basis for understanding the migration law of each component fluid in the physical simulation process of displacement and replacement.

[0072] Among them, the inner wall of the glass tube 110 is provided with a super-hydrophobic and oleophobic coating 150, which can effectively prevent the phenomenon of oil droplets / water droplets hanging on the wall during the separation process and avoid image recognition errors. The water-blocking and oil-permeable coated sand layer 140 on the inner wall of the middle part of the glass tube 110 can prevent water from flowing through the fourth interface 180 into the oil pumping plunger double pump 320 to be extracted, thereby ensuring the metering accuracy of the oil phase fluid. The top of the guide tube 340 extends to the middle part of the glass tube 110, which can effectively prevent gas from flowing to the water pumping port and the oil pumping port, 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 double pump 310 and the oil-pumping plunger double pump 320 refers to: the sum of the distances of the unidirectional movement of the two pistons in the water-pumping plunger double pump 310 and the oil-pumping plunger double pump 320 along the piston cavity. For example, the distance that a piston in the water-pumping plunger double pump 310 moves along the piston cavity once in a single direction 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 double pump 310 that moves back and forth along the piston cavity n times is nL, where n is a positive integer greater than or equal to 1. The sum of the distances of the unidirectional movement of the two pistons in the water-pumping plunger double pump 310 along the piston cavity is the cumulative displacement of the unidirectional motion of the piston of the water-pumping plunger double pump 310.

[0074] In this embodiment, the water level and the oil level are both measured and identified by taking the top surface of the bottom pad 130 as the 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 the 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 creative work are within the scope of protection of the present application.

Claims

1. A large flow gas, oil and water continuous separation device, characterized in that: It includes: The gas, oil and water separation system comprises a transparent glass tube, a top pad and a bottom pad respectively connected to and sealing the top and bottom ends of the glass tube, and a water-blocking and oil-permeable coated sand layer arranged on the inner wall of the middle part of the glass tube; A liquid level monitoring and acquisition system, including a camera for acquiring images in the glass tube and identifying the heights of the water level and the oil level; A dynamic control and measurement system comprises a water-drawing plunger double pump, an oil-drawing plunger double pump, a flow meter and a transparent flow guide tube whose top extends 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 the water-blocking and oil-permeable coated sand layer is provided through a pipeline 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 flow guide tube is connected to the bottom pad to connect to the outside of the glass tube.

2. 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 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 large flow gas, oil and water continuous separation device according to claim 1 is 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 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 large flow gas, oil and water continuous separation device according to claim 1 is 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 pumping plunger double pump is connected to the fourth interface through a pipeline.

7. A quantitative metering method for a large-flow gas, oil and water continuous separation device, characterized in that: The following steps are involved: 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 up and down as a reference, connect the oil pump plunger double pump to the glass tube between the oil level and the water level, use a camera to collect the 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 image according to the reference oil level and the water level measured height to obtain the real-time changing water level height h1 and oil level height h2 in the glass tube; Step 2: Use a water-drawing plunger double pump and an oil-drawing plunger double pump to selectively draw water and oil out of or into the glass tube, and record the water level h1(0) and oil level h2(0) in the glass tube at the initial moment; 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 level and the oil level in the glass tube, and control the unidirectional motion 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 make the height of the water level and the oil level constant; 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 and the height change data of the water level and the oil level in the glass tube.

8. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 7, characterized in that: The following formula is used to correct the water level and oil level heights identified by the camera image acquisition according to the measured oil level and water level heights to obtain the real-time changing water level height h1 and oil level height h2 in the glass tube: In the formula, 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 pad and the bottom pad in the glass tube, cm; D1 is the water level height recognized by the image captured by the camera, cm; D2 is the oil level height recognized by the image captured by the camera, cm.

9. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 7, 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: Wherein, u1(i) is the cumulative displacement of the piston of the water pumping plunger double pump in one direction at time i, cm; k1, k2 and k3 are coefficients for controlling the speed of the piston response of the water pumping plunger double pump, obtained through actual tests; h1(i) is the height of the water level at time i, cm; 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 height of the oil level constant: Wherein, u2(i) is the cumulative displacement of the unidirectional motion of the piston of the pumping plunger double pump at time i, cm; m1, m2 and m3 are coefficients for controlling the response speed of the piston of the pumping plunger double pump, which are obtained through actual tests; h2(i) is the oil level height at time i, cm.

10. The quantitative metering method for a large-flow gas, oil and water continuous separation device according to claim 7, characterized in that: The cumulative flow rate V1(i) of the water phase is calculated using the following formula: Wherein, u1(i) is the cumulative displacement of the piston of the water-pumping plunger double pump in one direction at time i, cm; A is the cross-sectional area of ​​a single piston chamber of the water-pumping plunger double pump, cm 2 ; S is the cross-sectional area of ​​the glass tube, cm 2 ; The cumulative flow rate V2(i) of the oil phase is calculated using the following formula: Where, u2(i) is the cumulative displacement of the piston of the oil pumping plunger double pump in one direction at time i, cm; A is the cross-sectional area of ​​a single piston cavity of the oil pumping plunger double pump, cm 2 ; S is the cross-sectional area of ​​the glass tube, cm 2 .

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