Oil-gas-water multiphase flow metering device

Abstract

The utility model relates to the technical field of oil field produced liquid metering, in particular to an oil-gas-water multiphase flow metering device. According to the technical scheme, the device comprises a skid seat, a gas-liquid pre-separation assembly, a liquid-phase metering assembly and a gas-phase metering assembly are installed on the skid seat, a liquid-phase metering liquid inlet pipe of the liquid-phase metering assembly is connected to a main liquid separation pipe of the gas-liquid pre-separation assembly, and the upper end of the liquid-phase metering liquid inlet pipe is connected to the lower end of a Y-shaped parallel pipe through an inlet pressure regulating valve; the upper end of the Y-shaped parallel pipe is connected with the first flow meter and the parallel pipe expansion flow meter, and the lower end of the parallel pipe expansion flow meter passes through the three-way parallel pipe expansion valve. The device has the beneficial effects that the device is miniaturized, and is small in occupied area, low in investment, convenient and flexible; in addition, the water content sampling detection assembly and the carbon dioxide gas concentration detection assembly are additionally arranged, the functions of water content sampling detection and carbon dioxide gas concentration detection are achieved while metering is conducted, the labor intensity of workers is reduced, and the detection result is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of oilfield produced fluid metering technology, and in particular to a multiphase flow metering device for oil, gas and water. Background Technology

[0002] Produced fluid metering is a crucial aspect of oilfield production management. Its core purpose is to accurately measure oil, gas, and water production, enabling subsequent adjustments to optimize production management. For example, real-time monitoring of well production dynamics provides data support for adjusting water injection and fracturing; it also serves as a direct basis for well production settlement; well production data is used to assess reservoir reserves and optimize development plans; and it can monitor abnormal production, such as sudden increases in water content, allowing for rapid intervention to ensure safe well production. However, traditional metering methods have significant errors when the water content of produced fluids exceeds 90%. Currently, the most widely used and mature method involves using a two-phase separator to separate the produced fluid into gas and liquid components for separate metering. However, this method has several technical limitations: existing two-phase separation metering equipment requires high investment and large floor space; it lacks expansion capabilities, limiting the metering range; and it cannot simultaneously perform water content sampling and carbon dioxide concentration detection, requiring manual operation and resulting in high labor intensity. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned deficiencies in existing technologies by providing an oil-gas-water multiphase flow metering device. This device achieves miniaturization by mounting liquid-phase and gas-phase metering components on a skid mount and adding a parallel pipe expansion function. It has a small footprint, low investment, and is convenient and flexible. Furthermore, it includes a gas-liquid pre-separation component, a water content sampling and detection component, and a carbon dioxide gas concentration detection component. This allows for simultaneous water content sampling and detection, as well as carbon dioxide gas concentration detection, reducing manual labor intensity and providing more accurate results.

[0004] This utility model discloses a multiphase flow metering device for oil, gas, and water. The technical solution includes a skid, an explosion-proof control box, an explosion-proof distribution box, a drain outlet, an outlet pipe, and an inlet pipe. The explosion-proof control box and the explosion-proof distribution box are installed on the skid, along with the drain outlet, outlet pipe, and inlet pipe. A liquid phase metering component and a gas phase metering component are installed on the skid. The liquid phase metering component includes a liquid phase metering inlet pipe, an inlet pressure regulating valve, a Y-shaped parallel pipe, a parallel pipe expansion valve, a parallel pipe expansion flow meter, and a first flow meter. The system includes a liquid phase metering outlet pipe and an outlet pressure regulating valve. The liquid phase metering inlet pipe is connected to the gas-liquid pre-separation assembly. The upper end of the liquid phase metering inlet pipe is connected to the lower end of a Y-shaped parallel pipe via an inlet pressure regulating valve. The upper end of the Y-shaped parallel pipe is connected to a first flow meter and a parallel pipe expansion flow meter, respectively. The upper ends of the first flow meter and the parallel pipe expansion flow meter converge at the liquid phase metering outlet pipe and are connected to the outlet pipe via an outlet pressure regulating valve. The lower end of the parallel pipe expansion flow meter is connected to the parallel pipe expansion valve via a tee.

[0005] The gas phase metering assembly includes a gas phase metering inlet, an extended gas channel, a first metering channel, a first conical orifice plate flow meter, a second conical orifice plate flow meter, an extended channel valve, and a gas phase outlet pipe. The upper ends of the extended gas channel and the first metering channel converge and are connected to the gas phase metering inlet. The first conical orifice plate flow meter is installed on the first metering channel, and the second conical orifice plate flow meter and the extended channel valve are installed on the extended gas channel. The lower ends of the extended gas channel and the first metering channel converge and are connected to the gas phase outlet pipe.

[0006] Preferably, the above-mentioned gas-liquid pre-separation assembly includes an inlet pipe, a first column-type hydrocyclone, a second column-type hydrocyclone, a third column-type hydrocyclone, a diverter pipe, an outlet pipe, and a main liquid-distributing pipe. The upper end of the inlet pipe is connected to the upper side of the first column-type hydrocyclone. The top of the first column-type hydrocyclone is connected to the upper side of the second and third column-type hydrocyclones through the diverter pipe. The lower ends of the first, second, and third column-type hydrocyclones converge into the main liquid-distributing pipe. The lower end of the main liquid-distributing pipe is provided with a drain outlet. The upper ends of the second and third column-type hydrocyclones are respectively provided with outlet pipes.

[0007] Preferably, the present invention further includes a water content sampling and detection component, which includes a sampling inlet pipe, a sampling pipe, a water content measuring instrument, a sampling gas outlet pipe, a sampling liquid outlet pipe, and a sampling liquid drain pipe. The water content measuring instrument is installed on the sampling pipe, the sampling inlet pipe and the sampling gas outlet pipe are installed on the upper side of the sampling pipe, the sampling liquid outlet pipe is installed on the lower side of the sampling pipe, and the sampling liquid drain pipe is installed at the lower end of the sampling pipe.

[0008] Preferably, the present invention further includes a carbon dioxide gas concentration detection component, which includes a gas sampling valve, a gas sampling tube, a carbon dioxide gas concentration detector, and a gas discharge valve. The carbon dioxide gas concentration detector is installed on the gas sampling tube, the gas sampling valve is installed at the upper inlet end of the gas sampling tube, and the gas discharge valve is installed at the lower outlet end of the gas sampling tube.

[0009] Preferably, a calibration valve is installed on the lower side of the gas sampling tube described above.

[0010] The beneficial effects of this utility model are as follows: By installing the liquid phase metering component and the gas phase metering component on the skid, and adding a parallel pipe expansion function, this utility model improves the metering range and can meet the requirements of different metering scenarios. Furthermore, the device is miniaturized, with a small footprint, low investment, and is convenient and flexible. A gas-liquid pre-separation component is also added to achieve gas-liquid pre-separation. The column-type cyclone separator used has a higher separation efficiency than conventional separators. Manufactured using pipes and fittings, it features small size and high separation efficiency. In addition, the added water content sampling and detection component and carbon dioxide gas concentration detection component simultaneously realize water content sampling and detection and carbon dioxide gas concentration detection functions while metering, reducing manual labor intensity and providing more accurate detection results. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0012] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle;

[0013] Figure 3 This is a schematic diagram of the gas-liquid pre-separation component;

[0014] Figure 4 This is a schematic diagram of the liquid phase metering component;

[0015] Figure 5 This is a schematic diagram of the gas phase metering component;

[0016] Figure 6 This is a schematic diagram of the structure of the water content sampling and detection component;

[0017] Figure 7 This is a schematic diagram of the carbon dioxide gas concentration detection component;

[0018] In the diagram: 1. Skid, 2. Gas-liquid pre-separation assembly, 3. Liquid phase metering assembly, 4. Moisture content sampling and detection assembly, 5. Gas phase metering assembly, 6. Carbon dioxide gas concentration detection assembly, 7. Explosion-proof control box, 8. Explosion-proof distribution box, 9. Sewage outlet, 10. Outlet pipe, 11. Inlet pipe;

[0019] 2.1 Liquid inlet pipe, 2.2 First column hydrocyclone, 2.3 Second column hydrocyclone, 2.4 Third column hydrocyclone, 2.5 Diverter pipe, 2.6 Gas outlet pipe, 2.7 Main liquid separator, 2.8 Branch gas separator pipe;

[0020] 3.1 Liquid phase metering inlet pipe, 3.2 Inlet pressure regulating valve, 3.3 Y-shaped parallel pipe, 3.4 Parallel pipe expansion valve, 3.5 Parallel pipe expansion flow meter, 3.6 First flow meter, 3.7 Liquid phase metering outlet pipe, 3.8 Outlet pressure regulating valve;

[0021] 4.1 Sampling inlet pipe, 4.2 Sampling pipe, 4.3 Moisture content measuring instrument, 4.4 Sampling gas discharge pipe, 4.5 Sampling liquid discharge pipe, 4.6 Sampling liquid drain pipe;

[0022] 5.1 Gas phase metering inlet, 5.2 Extended gas channel, 5.3 First metering channel, 5.4 First cone orifice plate flow meter, 5.5 Second cone orifice plate flow meter, 5.6 Extended channel valve, 5.7 Gas phase outlet pipe;

[0023] 6.1 Gas sampling valve, 6.2 Gas sampling tube, 6.3 Carbon dioxide gas concentration detector, 6.4 Calibration valve, 6.5 Gas discharge valve. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Example 1, referring to Figures 1-7This utility model discloses an oil-gas-water multiphase flow metering device, comprising a skid 1, an explosion-proof control box 7, an explosion-proof distribution box 8, a drain outlet 9, an outlet pipe 10, and an inlet pipe 11. The explosion-proof control box 7 and the explosion-proof distribution box 8 are installed on the skid 1, along with the drain outlet 9, the outlet pipe 10, and the inlet pipe 11. A liquid phase metering component 3 and a gas phase metering component 5 are installed on the skid 1. The liquid phase metering component 3 includes a liquid phase metering inlet pipe 3.1, an inlet pressure regulating valve 3.2, a Y-shaped parallel pipe 3.3, a parallel pipe expansion valve 3.4, a parallel pipe expansion flow meter 3.5, a first flow meter 3.6, and a liquid phase metering outlet pipe 3.7. The outlet pressure regulating valve 3.8 is used. The liquid phase metering inlet pipe 3.1 is connected to the main distribution pipe 2.7 of the gas-liquid pre-separation component 2. The upper end of the liquid phase metering inlet pipe 3.1 is connected to the lower end of the Y-shaped parallel pipe 3.3 through the inlet pressure regulating valve 3.2. The upper end of the Y-shaped parallel pipe 3.3 is connected to the first flow meter 3.6 and the parallel pipe expansion flow meter 3.5 respectively. The upper ends of the first flow meter 3.6 and the parallel pipe expansion flow meter 3.5 converge into the liquid phase metering outlet pipe 3.7 and are connected to the outlet pipe 10 through the outlet pressure regulating valve 3.8. The lower end of the parallel pipe expansion flow meter 3.5 is connected to the parallel pipe expansion valve 3.4 through a tee.

[0026] Reference Figure 5 The gas phase metering assembly 5 includes a gas phase metering inlet 5.1, an extended gas channel 5.2, a first metering channel 5.3, a first conical orifice flow meter 5.4, a second conical orifice flow meter 5.5, an extended channel valve 5.6, and a gas phase outlet pipe 5.7. The upper ends of the extended gas channel 5.2 and the first metering channel 5.3 converge and are connected to the gas phase metering inlet 5.1. The first conical orifice flow meter 5.4 is installed on the first metering channel 5.3, and the second conical orifice flow meter 5.5 and the extended channel valve 5.6 are installed on the extended gas channel 5.2. The lower ends of the extended gas channel 5.2 and the first metering channel 5.3 converge and are connected to the gas phase outlet pipe 5.7.

[0027] Among them, the explosion-proof control box 7 and the explosion-proof distribution box 8 are conventional technologies well known to those skilled in the art, and will not be described in detail.

[0028] Reference Figure 3The gas-liquid pre-separation assembly 2 includes an inlet pipe 2.1, a first column-type cyclone separator 2.2, a second column-type cyclone separator 2.3, a third column-type cyclone separator 2.4, a diverter pipe 2.5, an outlet pipe 2.6, a main liquid separator 2.7, and a branch gas diverter pipe 2.8. The upper end of the inlet pipe 2.1 is connected to the upper side of the first column-type cyclone separator 2.2, and the top of the first column-type cyclone separator 2.2 is connected to the second column-type cyclone separator 2.3 and the third column-type cyclone separator 2.4 through the diverter pipe 2.5. On the upper side of .4, the lower end of the diversion pipe 2.5 is connected to the second column cyclone separator 2.3 and the third column cyclone separator 2.4 through the branch gas diversion pipe 2.8. The lower ends of the first column cyclone separator 2.2, the second column cyclone separator 2.3 and the third column cyclone separator 2.4 converge into the main liquid distribution pipe 2.7. The lower end of the main liquid distribution pipe 2.7 is provided with a drain port 9. The upper ends of the second column cyclone separator 2.3 and the third column cyclone separator 2.4 are respectively provided with gas outlet pipes 2.6.

[0029] Reference Figure 6 The present invention also includes a water content sampling and detection component 4, which includes a sampling inlet pipe 4.1, a sampling pipe 4.2, a water content measuring instrument 4.3, a sampling gas discharge pipe 4.4, a sampling liquid discharge pipe 4.5, and a sampling liquid drain pipe 4.6. The water content measuring instrument 4.3 is installed on the sampling pipe 4.2, the sampling inlet pipe 4.1 and the sampling gas discharge pipe 4.4 are installed on the upper side of the sampling pipe 4.2, the sampling liquid discharge pipe 4.5 is installed on the lower side of the sampling pipe 4.2, and the sampling liquid drain pipe 4.6 is installed at the lower end of the sampling pipe 4.2.

[0030] In use, this invention achieves preliminary gas-liquid separation by passing the produced fluid from the oil well through the gas-liquid pre-separation component 2. The separated gas phase then undergoes secondary separation by passing the second column-type cyclone separator 2.3 and the third column-type cyclone separator 2.4. The separated gas phase then passes through the gas phase metering component 5 to measure the gas phase flow rate, and the liquid phase passes through the liquid phase metering component 3 to measure the liquid volume. The measured gas and liquid phases are then mixed and output through the outlet. A water content sampling and detection component 4 is installed in the inlet pipe at the metering device inlet to achieve water content sampling and detection. The measured medium then merges with the mainstream through the outlet.

[0031] Example 2: The oil-gas-water multiphase flow metering device mentioned in this utility model includes a skid 1, an explosion-proof control box 7, an explosion-proof power distribution box 8, a drain outlet 9, an outlet pipe 10, and an inlet pipe 11. The explosion-proof control box 7 and the explosion-proof power distribution box 8 are installed on the skid 1, and the drain outlet 9, the outlet pipe 10, and the inlet pipe 11 are also installed. The gas-liquid pre-separation component 2, the liquid phase metering component 3, the water content sampling and detection component 4, and the gas phase metering component 5 are installed on the skid 1.

[0032] The difference from Example 1 is:

[0033] Reference Figure 7 This utility model also includes a carbon dioxide gas concentration detection component 6, which includes a gas sampling valve 6.1, a gas sampling tube 6.2, a carbon dioxide gas concentration detector 6.3, and a gas discharge valve 6.5. The carbon dioxide gas concentration detector 6.3 is installed on the gas sampling tube 6.2. The gas sampling valve 6.1 is installed at the upper inlet end of the gas sampling tube 6.2 and connected to the gas phase outlet pipe 5.7 of the gas phase metering component 5. The gas discharge valve 6.5 is installed at the lower outlet end of the gas sampling tube 6.2. A calibration valve 6.4 is installed at the lower side of the gas sampling tube 6.2 for introducing a standard CO2 gas of known concentration.

[0034] In use, the gas discharged from the gas phase metering component 5 is then passed through the carbon dioxide gas concentration detection component 6 to realize the carbon dioxide concentration detection function, which reduces the labor intensity of manual labor and makes the detection results more accurate.

[0035] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. An oil-gas-water multiphase flow metering device, comprising a skid (1), an explosion-proof control box (7), an explosion-proof distribution box (8), a blowdown port (9), an outlet pipe (10), and an inlet pipe (11), wherein the explosion-proof control box (7) and the explosion-proof distribution box (8) are installed on the skid (1), and the blowdown port (9), the outlet pipe (10), and the inlet pipe (11) are arranged, characterized in that: The liquid phase metering assembly (3) and the gas phase metering assembly (5) are installed on the skid (1), the liquid phase metering assembly (3) comprises a liquid phase metering inlet pipe (3.1), an inlet pressure regulating valve (3.2), a Y-shaped combining pipe (3.3), a combining pipe expansion valve (3.4), a combining pipe expansion flowmeter (3.5), a first flowmeter (3.6), a liquid phase metering outlet pipe (3.7), an outlet pressure regulating valve (3.8), the liquid phase metering inlet pipe (3.1) is connected with the gas-liquid pre-separation assembly (2), the upper end of the liquid phase metering inlet pipe (3.1) is connected with the lower end of the Y-shaped combining pipe (3.3) through the inlet pressure regulating valve (3.2), the upper end of the Y-shaped combining pipe (3.3) is connected with the first flowmeter (3.6) and the combining pipe expansion flowmeter (3.5) respectively, the upper ends of the first flowmeter (3.6) and the combining pipe expansion flowmeter (3.5) are gathered to the liquid phase metering outlet pipe (3.7), and the liquid phase metering outlet pipe (3.7) is connected with the outlet pipe (10) through the outlet pressure regulating valve (3.8); the lower end of the combining pipe expansion flowmeter (3.5) is connected with the combining pipe expansion valve (3.4) through a three-way pipe. ​ The gas phase metering assembly (5) comprises a gas phase metering inlet (5.1), an expansion gas channel (5.2), a first metering channel (5.3), a first conical orifice plate flowmeter (5.4), a second conical orifice plate flowmeter (5.5), an expansion channel valve (5.6), and a gas phase outlet pipe (5.7), the upper ends of the expansion gas channel (5.2) and the first metering channel (5.3) are gathered together and connected with the gas phase metering inlet (5.1), the first metering channel (5.3) is provided with the first conical orifice plate flowmeter (5.4), the expansion gas channel (5.2) is provided with the second conical orifice plate flowmeter (5.5) and the expansion channel valve (5.6), and the lower ends of the expansion gas channel (5.2) and the first metering channel (5.3) are gathered together and connected with the gas phase outlet pipe (5.7).

2. The oil-gas-water multiphase flow metering device of claim 1, wherein: The gas-liquid pre-separation assembly (2) comprises an inlet pipe (2.1), a first column cyclone separator (2.2), a second column cyclone separator (2.3), a third column cyclone separator (2.4), a flow dividing pipe (2.5), a gas outlet pipe (2.6), and a main liquid outlet pipe (2.7), the upper end of the inlet pipe (2.1) is connected with the upper side of the first column cyclone separator (2.2), the top of the first column cyclone separator (2.2) is connected with the upper sides of the second column cyclone separator (2.3) and the third column cyclone separator (2.4) through the flow dividing pipe (2.5), the lower ends of the first column cyclone separator (2.2), the second column cyclone separator (2.3) and the third column cyclone separator (2.4) are gathered to the main liquid outlet pipe (2.7), the lower end of the main liquid outlet pipe (2.7) is provided with a blowdown opening (9), and the upper ends of the second column cyclone separator (2.3) and the third column cyclone separator (2.4) are respectively provided with the gas outlet pipe (2.6).

3. The oil-gas-water multiphase flow metering device of claim 2, wherein: It also comprises a water-containing sample detection assembly (4) which comprises a sample inlet pipe (4.1), a sample pipe (4.2), a water content measuring instrument (4.3), a sample gas discharge pipe (4.4), a sample liquid discharge pipe (4.5), and a sample liquid discharge pipe (4.6). The water content measuring instrument (4.3) is installed on the sample pipe (4.2). The sample inlet pipe (4.1) and the sample gas discharge pipe (4.4) are installed on the upper side of the sample pipe (4.2). The sample liquid discharge pipe (4.5) is installed on the lower side of the sample pipe (4.2). The sample liquid discharge pipe (4.6) is installed on the lower end of the sample pipe (4.2).

4. The oil-gas-water multiphase flow metering device of claim 3, wherein: It also comprises a carbon dioxide gas concentration detection assembly (6) which comprises a gas sampling valve (6.1), a gas sampling pipe (6.2), a carbon dioxide gas concentration detector (6.3), and a gas discharge valve (6.5). The carbon dioxide gas concentration detector (6.3) is installed on the gas sampling pipe (6.2). The gas sampling valve (6.1) is installed on the upper side of the gas sampling pipe (6.2). The gas discharge valve (6.5) is installed on the lower end of the gas sampling pipe (6.2).

5. The oil-gas-water multiphase flow metering device of claim 4, wherein: The lower side of the gas sampling pipe (6.2) is installed with a calibration valve (6.4).

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