Device and method for measuring non-condensable gas of high-temperature geothermal fluid

Abstract

The invention discloses a device and method for measuring non-condensed gas of high-temperature geothermal fluid, and belongs to the field of high-temperature geothermal field heat storage engineering tests.The device comprises a steam-water separator (2) and a non-condensed gas collecting device (9) which are sequentially connected, and the non-condensed gas collecting device (9) comprises a non-condensed gas collecting tank (10) and a water inlet and outlet adjusting tank (12); the two parts are communicated through a connecting graduated tube (11), and a corresponding valve and a corresponding connecting tube are also arranged; the measuring method comprises the following steps: converting the collected non-condensable gas into the mass of the gas, and measuring the mass of drained water in the water collecting tank, so as to calculate the mass ratio of the non-condensable gas; the method can obtain accurate and reliable mass concentration data of the non-condensable gas in the fluid, is suitable for the fields of single-well productivity testing, geothermal resource evaluation, geothermal field production monitoring and the like of the high-temperature geothermal field, and provides reliable data for scale prevention and inhibition of the high-temperature geothermal field and design of a power plant unit.

Description

Technical Field

[0001] The invention relates to the field of high-temperature geothermal field heat storage engineering testing, and in particular to a device and method for measuring non-condensable gas in high-temperature geothermal fluid. Background Art

[0002] Scaling is a common phenomenon in geothermal systems during operation, and they all face the problem of scaling in wellbores and pipe networks. In the shallow geothermal wells of Yangbajing Geothermal Field, a typical geothermal field in Tibet, the scaling type is mostly carbonate scaling, which has seriously affected the production of Yangbajing Geothermal Field. Other geothermal fields in the Tibetan Plateau also have scaling problems. In order to solve the problem of scaling prevention and scale inhibition of high-temperature geothermal wells, it is necessary to add scale inhibitors below the flash surface. Therefore, the determination of the flash surface position is an urgent issue. Many scholars at home and abroad have conducted research on flash trends and scaling positions, and analyzed that the main influencing factors are the heat storage pressure, flow rate and carbon dioxide content in the fluid.

[0003] Carbonate scale generally occurs near and above the flash surface in the wellbore, usually in the presence of calcium-rich high CO 2 Fluid lean CO 2 Fluids are more likely to deposit calcite and CO must be monitored during production 2 Changes in concentration can be used to adjust the amount and location of antiscalant addition.

[0004] In addition, in the power generation system, a relatively high concentration of non-condensable gas refers to the general term for gases that cannot condense into liquid form with water vapor during the cooling process of geothermal fluids. The main components are carbon dioxide, hydrogen sulfide, hydrogen, methane, nitrogen, helium, argon, etc. During the discharge of non-condensable gas, steam will be taken away, reducing the thermal conversion efficiency of the unit. Therefore, the content of non-condensable gas must be accurately measured during the capacity testing and production process of high-temperature geothermal fields. Summary of the invention

[0005] One of the purposes of the present invention is to provide a device for measuring non-condensable gas in high-temperature geothermal fluid to solve the above-mentioned problem.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a device for measuring non-condensable gas in high-temperature geothermal fluid, comprising a steam-water separator, wherein the outlet end of the steam-water separator is respectively connected to a liquid phase cooling pool and a gas phase cooling pool, the other end of the liquid phase cooling pool is connected to a non-condensable gas collecting device through a liquid phase water inlet pipe, the other end of the gas phase cooling pool is also connected to a non-condensable gas collecting device through a gas phase water inlet pipe, and the non-condensable gas collecting device is connected to a water collecting tank through a water outlet pipe, wherein the non-condensable gas collecting device comprises a non-condensable gas collecting tank located at the upper part and an inlet and outlet water regulating tank located at the lower part, the condensable gas collecting tank is connected to the inlet and outlet water regulating tank through a connecting calibrated tube, and the inlet and outlet water regulating tank is provided with two water inlets and one water outlet, wherein the two water inlets are respectively connected to the liquid phase water inlet pipe and the gas phase water inlet pipe, and the one water outlet is connected to the water outlet pipe.

[0007] As a preferred technical solution, a pressure gauge and a thermometer A are provided on the steam-water separator.

[0008] As a preferred technical solution, the condensed gas collection tank and the inlet and outlet water regulating tank are both cylindrical tank bodies.

[0009] As a preferred technical solution, a liquid-phase water inlet three-way valve is provided on the liquid-phase water inlet pipe, a gas-phase water inlet three-way valve is provided on the gas-phase water inlet pipe, and a water outlet piston valve is provided on the water outlet pipe.

[0010] As a preferred technical solution, a liquid-phase water inlet external discharge pipe connected to the liquid-phase water inlet three-way valve and a gas-phase water inlet external discharge pipe connected to the gas-phase water inlet three-way valve are also provided.

[0011] As a preferred technical solution, an external protection frame is further provided on the outside of the condensed gas collection tank and the inlet and outlet water regulating tank.

[0012] The second object of the present invention is to provide a method for measuring non-condensable gas of high-temperature geothermal fluid using the above-mentioned device, and the technical solution adopted is as follows:

[0013] (1) Before measurement, turn the non-condensable gas collection device upside down, fill it with liquid from the outlet pipe connected to the inlet and outlet water regulating tank, open the two water inlets to exhaust the gas in the device, and then put the non-condensable gas collection device upright;

[0014] (2) Open the main valve, connect the liquid phase water inlet three-way valve and the gas phase water inlet three-way valve to the corresponding external drain pipes to drain water, and after the temperature and pressure of the steam-water separator are stable, connect the liquid phase water inlet three-way valve and the gas phase water inlet three-way valve to the inlet and outlet water regulating tanks, and connect the condensed liquid, water vapor and non-condensable gas to the non-condensable gas collection device;

[0015] The non-condensable gas is collected at the top of the non-condensable gas collection tank, and the liquid is discharged into the water collection tank from the bottom of the inlet and outlet water regulating tank;

[0016] The water level in the water collecting tank is consistent with the middle scale height of the connected scale tube, and the outlet pipe is immersed below the water surface of the water collecting tank before the measurement is completed;

[0017] After the gas-water interface reaches the connecting graduated tube (the graduated tube is used to measure the volume of the gas in the non-condensable gas collection tank, and the amount is read by the scale, and the specific range of the scale is 7480mL~7550mL), close the liquid phase water inlet three-way valve and the gas phase water inlet three-way valve at the same time, and make the three-way valve drain water laterally; after the gas and liquid in the non-condensable gas collection device are completely separated and the liquid level in the connecting graduated tube is stable, close the water outlet piston valve; finally, close the main valve;

[0018] (4) After closing the outlet piston valve, collect the liquid in the outlet pipe into the water collecting tank;

[0019] (5) Record data: Simultaneously record the temperature of the non-condensable gas collection tank (T) and the scale on the connected scale tube (V 气 ); use an electronic scale to measure the weight of the discharged liquid (V 水 ) (i.e., the weight of the liquid in the sump); and record the atmospheric pressure (P);

[0020] (6) Data analysis: Based on the composition and volume of the non-condensable gas, the average molecular weight of the gas with a volume ratio exceeding 1% is calculated, and the mass ratio of the non-condensable gas in the geothermal fluid is further calculated.

[0021] As a preferred technical solution, in step (6), the data analysis includes:

[0022] 1) Laboratory analysis of non-condensable gas components, calculation of the average molecular weight of the gas, only the gas with a volume fraction exceeding 1% is calculated;

[0023] The specific analysis method is to use a gas chromatograph in the laboratory, instrument model: PE.Clarus600, determination method: GB / T 13610 Natural gas component analysis gas chromatography method;

[0024] It should be noted that the reason why only gases with a volume fraction of more than 1% are calculated is that the effect of gases with a volume fraction of less than 1% on the calculated gas average molecular weight is less than 0.01, and has no significant effect on the measurement accuracy.

[0025] The calculated average molecular weight (M ra ) is:

[0026]

[0027] Among them, M i is the molecular weight of the i-th gas, V i is the volume ratio of the i-th gas.

[0028] 2) Calculate the mass of non-condensable gas according to the ideal gas state equation. The calculation formula is:

[0029] M 气 =M ra P 气 V 气 / (RT) (2)

[0030] Where M 气 Represents the mass of non-condensable gas, in kg;

[0031] M ra Represents the average molecular weight of non-condensable gas;

[0032] P 气 Represents the atmospheric pressure measured on site, in Pa;

[0033] V 气 Represents the volume of non-condensable gas measured on site, in m 3 ;

[0034] R represents the proportionality constant, 8.314 J / (mol·K);

[0035] T represents the temperature of the non-condensable gas storage tank measured on site, in K;

[0036] According to the non-condensable gas mass and liquid weight (V 水 ), calculate the mass ratio of non-condensable gas in the liquid phase (n l ), the calculation formula is:

[0037] n l =M 气 / ( M 气 +V 水 ) (3).

[0038] The measuring device of the present invention separates, cools and compresses the geothermal fluid, and then enters the non-condensable gas collection device, converts the collected non-condensable gas into gas mass, measures the mass of the drainage in the water collecting tank, and calculates the mass ratio of the non-condensable gas.

[0039] The device and method provided by the present invention for measuring non-condensable gas in high-temperature geothermal fluids measure the weight ratio of non-condensable gas, which is of great significance for the design of high-temperature geothermal units, the research work on scale prevention and inhibition of geothermal wells, and the injection amount and injection position of scale inhibitors.

[0040] Compared with the prior art, the advantages of the present invention are: the non-condensable gas measurement device and method of the present invention can obtain accurate and reliable non-condensable gas mass concentration data in the fluid, and is suitable for the fields of single well productivity testing, geothermal resource assessment, geothermal field production monitoring, etc. of high-temperature geothermal fields. It can be applied to the measurement of non-condensable gas in the wellhead fluid of high-temperature geothermal fields in Tibet, Sichuan, Yunnan, Xinjiang and other places in my country, and provide reliable data for scale prevention and control of high-temperature geothermal fields and design of power plant units, thereby providing a reference for corresponding decisions; the present invention improves the measurement accuracy through multiple measurements, obtains the concentration of non-condensable gas, and the data is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a diagram of a device for measuring non-condensable gas in high-temperature geothermal fluid according to Example 1 of the present invention;

[0042] Figure 2 This is a flow chart for measuring non-condensable gas in geothermal fluid according to Example 2 of the present invention.

[0043] In the figure: 1. main valve; 2. steam-water separator; 3. pressure gauge; 4. thermometer A; 5. liquid phase cooling pool; 6. gas phase cooling pool; 7. liquid phase water inlet pipe; 8. gas phase water inlet pipe; 9. non-condensable gas collecting device; 10. non-condensable gas collecting tank; 11. connecting scale tube; 12. inlet and outlet water regulating tank; 13. thermometer B; 14. external protection frame; 15. liquid phase water inlet three-way valve; 16. gas phase water inlet three-way valve; 17. liquid phase water inlet external discharge pipe; 18. gas phase water inlet external discharge pipe; 19. outlet piston valve; 20. outlet pipe; 21. water collecting tank. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Embodiment 1:

[0046] See also Figure 1A device for measuring non-condensable gas of high-temperature geothermal fluid, comprising a water-gas separator 2 (commercially available, manufacturer: Wuxi Qibot Environmental Protection Technology Co., Ltd., model: L15), a pipeline is connected to the inlet end of the water-gas separator, a main valve 1 is arranged on the pipeline, and its outlet end is connected to a liquid cooling pool 5 and a gas cooling pool 6 respectively, the other end of the liquid cooling pool 5 is connected to a non-condensable gas collecting device 9 through a liquid water inlet pipe 7, and the other end of the gas cooling pool 6 is also connected to a non-condensable gas collecting device through a gas water inlet pipe 8 9, the non-condensable gas collecting device 9 is connected to the water collecting tank 21 through the water outlet pipe 20, wherein the non-condensable gas collecting device 9 includes a non-condensable gas collecting tank 10 located at the upper part and an inlet and outlet water regulating tank 12 located at the lower part, the condensable gas collecting tank 10 is connected with the inlet and outlet water regulating tank 12 through a connecting graduated tube 11, and the inlet and outlet water regulating tank 12 is provided with two water inlets and one water outlet, wherein the two water inlets are respectively connected to the liquid phase water inlet pipe 7 and the gas phase water inlet pipe 8, and the one water outlet is connected to the water outlet pipe 20;

[0047] In this embodiment, a pressure gauge 3 and a thermometer A4 are provided on the steam-water separator 2, and a thermometer B13 is provided on the condensed gas collection tank 10. The condensed gas collection tank 10 and the inlet and outlet water regulating tank 12 are both cylindrical tank bodies;

[0048] The liquid phase water inlet pipe 7 is provided with a liquid phase water inlet three-way valve 15, the gas phase water inlet pipe 8 is provided with a gas phase water inlet three-way valve 16, and the water outlet pipe 20 is provided with a water outlet piston valve 19;

[0049] A liquid phase water inlet external discharge pipe 17 connected to the liquid phase water inlet three-way valve 15 and a gas phase water inlet external discharge pipe 18 connected to the gas phase water inlet three-way valve 16 are also provided;

[0050] An outer protection frame 14 is also provided outside the condensed gas collection tank 10 and the inlet and outlet water regulating tank 12;

[0051] In this embodiment, the inlet and outlet water regulating tank 12, the non-condensable gas collection tank 10, the connecting graduated tube 11, the liquid phase water inlet three-way valve 15, the gas phase water inlet three-way valve 16, and the outlet piston valve 19 are all made of high temperature resistant high borosilicate glass; the outer protection frame 14 is made of steel; the connecting pipes between the various devices are all silicone hoses;

[0052] Specifications and models of the main equipment in this embodiment:

[0053] The inlet and outlet water regulating tank 12 is a cylindrical tank with a diameter of 20 cm, a height of 15 cm, and a wall thickness of 4 mm; the non-condensable gas collecting tank 10 is a cylindrical tank with a diameter of 20 cm, a height of 25 cm, and a wall thickness of 4 mm; the connecting graduated tube 11 is a cylindrical body with a diameter of 3.6 cm, a height of 10 cm, and a wall thickness of 3 mm;

[0054] The outer protection frame 14 is a cube, used to fix the inlet and outlet water regulating tank 12 and the non-condensable gas collecting tank 10, with an internal size of 20.6cm*20.6cm*50.6cm, and a shock-absorbing pad with a thickness of 3mm is set on the side, top and bottom to protect the non-condensable gas collecting device during transportation and use; four support feet with a height of 15cm are set under the protection frame;

[0055] The silicone hose connecting each device is 24# hose, 6.4mm×11.4mm;

[0056] The two water inlet pipes of the inlet and outlet water regulating tank 12 are three-way valves, which are connected to the inlet and outlet water regulating tanks on the top. The water inlet pipe enters the inlet and outlet water regulating tanks 3cm, and the bottom and side are pagoda (pagoda connector is a commonly used connector for quick connection of hydraulic oil circuits and air pressure pipelines, which is convenient for connecting hoses) connectors with an outer diameter of 6.4mm;

[0057] The water outlet is a piston valve, connected to the bottom of the water inlet and outlet regulating tank, and has a pagoda joint at the bottom, with a diameter of 6.4mm;

[0058] An industrial-grade thermocouple temperature probe is installed in the middle of the non-condensable gas collection tank;

[0059] The pressure gauge is a special model for plateau (manufacturer: Shanghai Dumai Automation Technology Co., Ltd., model: DYM3-1).

[0060] Example 2

[0061] The method for measuring non-condensable gas of high-temperature geothermal fluid using the device of Example 1 comprises the following steps:

[0062] (1) Before measurement, the non-condensable gas collection device 9 is inverted, and liquid is poured into the water outlet pipe 20 located in the middle of the inlet and outlet water regulating tank 12. The two water inlet three-way valves 15 for the liquid phase and 16 for the gas phase are opened to exhaust gas, and the gas in the device is completely exhausted;

[0063] (2) Then, the non-condensable gas collecting device 9 is placed upright; the liquid phase water inlet pipe 7, the gas phase water inlet pipe 8, the liquid phase water inlet external discharge pipe 17, the gas phase water inlet external discharge pipe 18 and the water outlet pipe 20 are connected with a silicone hose; so that the whole device remains firm and stable;

[0064] (3) Open the main valve 1, connect the liquid-phase water inlet three-way valve 15 and the gas-phase water inlet three-way valve 16 to the liquid-phase water inlet external discharge pipe 17 and the gas-phase water inlet external discharge pipe 18 respectively, and drain the water. After the values ​​displayed by the pressure gauge 3 and the thermometer A4 on the steam-water separator 2 are stable, connect the liquid-phase water inlet three-way valve 15 and the gas-phase water inlet three-way valve 16 to the inlet and outlet water regulating tank 12, and connect the condensed liquid, water vapor and non-condensable gas to the non-condensable gas collecting device 9;

[0065] (4) The non-condensable gas is collected at the top of the non-condensable gas collection tank 10, and the liquid is discharged from the water outlet piston valve 19 at the bottom of the inlet and outlet water regulating tank 12, together with the liquid and condensed steam entering the inlet and outlet water regulating tank 12, and discharged into the water collecting tank 21 through the water outlet piston valve 19;

[0066] (5) The water level in the water collecting tank 21 is consistent with the middle scale height of the connecting graduated tube 11, and the outlet pipe 20 is immersed below the water surface of the water collecting tank 21 before the measurement is completed;

[0067] (6) After the gas-water interface reaches the connecting graduated tube 11, close the liquid phase water inlet three-way valve 15 and the gas phase water inlet three-way valve 16 at the same time, so that the two three-way valves can drain water laterally; after the gas and liquid in the non-condensable gas collection device 9 are stable and the liquid level in the connecting tube 11 is stable, close the water outlet piston valve 19; finally, close the main valve 1;

[0068] (7) After closing the water outlet piston valve 19, the liquid in the water outlet pipe 20 between the water outlet piston valve 19 and the water collecting tank 21 is collected in the water collecting tank 21;

[0069] (8) Recording data: Simultaneously record the temperature (T) of the non-condensable gas collection tank 10 and the scale (V 气 ); using an electronic scale to measure the weight of the discharged liquid collected in the water collecting tank 21 in step (7) (V 水 );Record atmospheric pressure (the data measured by pressure gauge DYM3-1) (P);

[0070] Notes on the above non-condensable gas measurement process:

[0071] (1) The non-condensable gas collection device 9 is preferably filled with water that is cooled from the geothermal well, so as to avoid scaling caused by contact between waters of different water chemical components;

[0072] (2) After the steam-water separator 2 runs stably, the non-condensable gas collecting device 9 is fed with water again, and the valve opening sequence is: first open the water outlet piston valve 19, and then simultaneously open the liquid phase water inlet three-way valve 15 and the gas phase water inlet three-way valve 16; when the measurement is finished, the valve closing sequence is: simultaneously close the liquid phase water inlet three-way valve 15 and the gas phase water inlet three-way valve 16, and then close the water outlet piston valve 19 after the gas-liquid interface of the connected calibration tube 11 is stable;

[0073] (3) The water level in the water collecting tank 21 is consistent with the height of the connecting pipe scale 11; before the measurement is completed, the outlet pipe 20 is immersed below the water level in the water collecting tank 21. After the three-way valve of the water inlet is closed, it is normal for the outlet pipe 20 to have backflow;

[0074] (4) Simultaneously record the temperature (T) of the non-condensable gas collection tank 10 and the scale (V 气 );

[0075] Step 6: Data analysis includes:

[0076] (1) Laboratory analysis of non-condensable gas components, calculation of the average molecular weight of the gas, and only calculation of gases with a volume fraction exceeding 1%;

[0077] According to the laboratory non-condensable gas components, the average molecular weight (M ra )

[0078]

[0079] M i - The molecular weight of the ith gas, V i -The volume ratio of the i-th gas;

[0080] This example takes a well in the Gulu geothermal field as an example. The well is a high-temperature geothermal well. According to laboratory analysis, the gas with a volume ratio exceeding 1% is CO 2 、N 2 and O 2 , whose volume ratios are 0.752, 0.165, and 0.0533, respectively. The average molecular weight (M) is calculated by the above formula (1): ra ) is 40.82;

[0081] (2) Calculate the mass of non-condensable gas based on the ideal gas state equation

[0082] M 气 =M ra P 气 V 气 / (RT) (2)

[0083] According to the mass of carbon dioxide and the weight of liquid (V 水 ), calculate the mass ratio of non-condensable gas in the liquid phase (n l );

[0084] n l =M co2 / (M co2 +V 水 ) (3)

[0085] Three sets of data were measured on site, and the mass ratio of non-condensable gas was calculated. The atmospheric pressure measured on site at the Gulu geothermal field was 576hPa; the measured values ​​of each parameter are detailed in Table 1. The average content of non-condensable gas in geothermal fluid was calculated to be 0.281%.

[0086] Table 1 Calculation results of the mass ratio of non-condensable gas in a well in the Gulu geothermal field

[0087]

[0088] The device and measurement method implemented by the embodiments of the present invention can be used for geothermal fluids in all temperature ranges, such as medium and high temperature geothermal field production wells and production pipelines, and are simple and safe to operate, and the data are accurate and reliable.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring non-condensable gas in high-temperature geothermal fluid, characterized in that: The invention comprises a steam-water separator (2), wherein the outlet end of the steam-water separator is respectively connected to a liquid phase cooling pool (5) and a gas phase cooling pool (6), the other end of the liquid phase cooling pool (5) is connected to a non-condensable gas collecting device (9) via a liquid phase water inlet pipe (7), the other end of the gas phase cooling pool (6) is also connected to the non-condensable gas collecting device (9) via a gas phase water inlet pipe (8), and the non-condensable gas collecting device (9) is connected to a water collecting tank (21) via a water outlet pipe (20), wherein the The non-condensable gas collection device (9) comprises a non-condensable gas collection tank (10) located at the top and an inlet and outlet water regulating tank (12) located at the bottom, wherein the condensable gas collection tank (10) is connected to the inlet and outlet water regulating tank (12) via a connecting graduated tube (11), and the inlet and outlet water regulating tank (12) is provided with two water inlets and one water outlet, wherein the two water inlets are respectively connected to a liquid phase water inlet pipe (7) and a gas phase water inlet pipe (8), and the one water outlet is connected to a water outlet pipe (20).

2. The device according to claim 1, characterized in that The steam-water separator (2) is provided with a pressure gauge (3) and a thermometer A (4).

3. The device according to claim 1, characterized in that The condensed gas collection tank (10) and the inlet and outlet water regulating tank (12) are both cylindrical tank bodies.

4. The device according to claim 1, characterized in that The liquid phase water inlet pipe (7) is provided with a liquid phase water inlet three-way valve (15), the gas phase water inlet pipe (8) is provided with a gas phase water inlet three-way valve (16), and the water outlet pipe (20) is provided with a water outlet piston valve (19).

5. The device according to claim 1, characterized in that A liquid-phase water inlet external discharge pipe (17) connected to the liquid-phase water inlet three-way valve (15) and a gas-phase water inlet external discharge pipe (18) connected to the gas-phase water inlet three-way valve (16) are also provided.

6. The device according to claim 1, characterized in that An external protection frame (14) is also provided outside the condensed gas collection tank (10) and the inlet and outlet water regulating tank (12).

7. A method for measuring non-condensable gas in high-temperature geothermal fluid using the device according to any one of claims 1 to 6, characterized in that: The steps include: (1) Before measurement, the non-condensable gas collecting device (9) is inverted, and liquid is poured into the water outlet pipe (20) connected to the water inlet and outlet regulating tank (12), and the two water inlets are opened to exhaust gas, and the gas in the device is completely exhausted, and then the non-condensable gas collecting device (9) is placed upright; (2) Open the main valve (1), connect the liquid phase water inlet three-way valve (15) and the gas phase water inlet three-way valve (16) to the corresponding external drain pipes for drainage, and after the temperature and pressure of the steam-water separator (2) are stabilized, connect the liquid phase water inlet three-way valve (15) and the gas phase water inlet three-way valve (16) to the inlet and outlet water regulating tank (12), and connect the condensed liquid, water vapor and non-condensable gas to the non-condensable gas collection device (9); The non-condensable gas is collected at the top of the non-condensable gas collection tank (10), and the liquid is discharged from the lower part of the inlet and outlet water regulating tank (12) into the water collecting tank (21); The water level in the water collecting tank (21) is consistent with the middle scale height of the connected scale tube (11), and the outlet pipe (20) is immersed below the water level in the water collecting tank (21) before the measurement is completed; (3) After the gas-water interface reaches the connection graduated tube (11), the liquid phase water inlet three-way valve (15) and the gas phase water inlet three-way valve (16) are closed simultaneously, and the three-way valves are drained laterally; after the gas and liquid in the non-condensable gas collection device (9) are completely separated and the liquid level in the connection graduated tube (11) is stable, the water outlet piston valve (19) is closed; finally, the main valve is closed; (4) After closing the water outlet piston valve (19), the liquid in the water outlet pipe (20) is collected in the water collecting tank (21); (5) Recording data: Simultaneously record the temperature (T) of the non-condensable gas collection tank (10) and the scale (V 气 ); use an electronic scale to measure the weight of the discharged liquid (V 水 ) and record the atmospheric pressure (P); (6) Data analysis: Based on the composition and volume of the non-condensable gas, the average molecular weight of the gas with a volume ratio exceeding 1% is calculated, and the mass ratio of the non-condensable gas in the geothermal fluid is further calculated.

8. The method according to claim 7, characterized in that In step (6), the data analysis includes: 1) Laboratory analysis of non-condensable gas components, calculation of the average molecular weight of the gas, only the gas with a volume fraction exceeding 1% is calculated; The calculated average molecular weight (M ra ) is: Among them, M i is the molecular weight of the i-th gas, V i is the volume ratio of the i-th gas. 2) Calculate the mass of non-condensable gas according to the ideal gas state equation. The calculation formula is: M 气 =M ra P 气 V 气 / (RT) (2) Where M 气 Represents the mass of non-condensable gas, in kg; M ra Represents the average molecular weight of non-condensable gas; P 气 Represents the atmospheric pressure measured on site, in Pa; V 气 Represents the volume of non-condensable gas measured on site, in m 3 ; R represents the proportionality constant, 8.314 J / (mol·K); T represents the temperature of the non-condensable gas storage tank measured on site, in K; According to the non-condensable gas mass and liquid weight (V 水 ), calculate the mass ratio of non-condensable gas in the liquid phase (n l ), the calculation formula is: n l =M 气 / ( M 气 +V 水 ) (3)。

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