Wellhead online analysis system and method for oilfield associated gas components

Abstract

The invention belongs to the technical field of oil well associated gas component analysis, and discloses an oil field associated gas component wellhead online analysis system and method. The wellhead online analysis system for the oilfield associated gas components comprises a circulating suction unit, an oilfield associated gas component analysis unit, a backflow unit and a remote control unit, the circulating suction unit comprises an electric valve, a gas-liquid separation tank and a circulating pump which are connected in sequence, the oilfield associated gas component analysis unit comprises a pressure reducing valve, an electric valve and a gas component detection part which are connected in sequence, and the backflow unit comprises an accumulated liquid backflow unit and an accumulated waste gas emptying unit. The circulating suction unit, the oilfield associated gas component analysis unit and the backflow unit are arranged on a sealed sampling pipeline formed at a wellhead sampling position. According to the wellhead online analysis system for the oil field associated gas components, online detection of the oil field associated gas components is achieved, and the reliability and accuracy of online analysis are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well associated gas component analysis, and in particular relates to a wellhead online analysis system and method for oil field associated gas components. Background Art

[0002] Oilfield associated gas mainly refers to natural gas dissolved in crude oil and free natural gas at the top of the oil layer. Under the high temperature and high pressure environment of underground oil reservoirs, natural gas (mainly methane, ethane, propane, and other hydrocarbon gases, as well as hydrogen sulfide gas) can dissolve in crude oil. When crude oil is mined to the ground, as the pressure decreases, these gases dissolved in crude oil will escape from the crude oil and become oilfield associated gas. Due to the implementation of some special processes to increase production or recovery rate, oilfield associated gas often contains carbon dioxide, carbon monoxide, nitrogen and other gases, and enters the pipeline from the wellhead at the same time as the well fluid. Hydrogen sulfide is a dangerous gas and requires key detection to prevent personal injury to construction workers. The changes in the content of carbon dioxide, carbon monoxide, and nitrogen components are usually important evaluation indicators for the implementation process and effect of special processes, and all require real-time online detection. Therefore, online analysis of the components of oil well associated gas is of great significance to the safety and production management of oil and gas fields.

[0003] At present, in the process of oil production in oil fields, the analysis of associated gas components in oil wells is carried out by manual wellhead sampling and chromatographic analysis in the laboratory. While online detection cannot be achieved, there are problems such as high labor intensity, high safety risks, small data volume, and long data reading cycle. The main reasons are as follows: First, manual sampling requires operators to wear positive pressure respirators for personal safety protection, open the sampling valve at the wellhead, and use sampling bags for sampling; gas and liquid leakage will inevitably occur during the process, which has high labor intensity and high safety risks. As a result, it is difficult to meet the certain detection frequency and repeat sampling and detection analysis multiple times a day. Second, the detection of associated gas at the wellhead must be carried out under the oil and gas mixed pressure environment during the production of the oil well. The gas-liquid mixed medium under a certain pressure contains oil-water mixture and saturated water vapor, which also makes various infrared and electrochemical gas detection probes unable to be applied on-site. Third, the environment at the wellhead is relatively harsh, with a large number of interfering factors such as oil, dust, mechanical vibration, and pipeline pressure. Oil may contaminate the injection system, pipelines and other components of the chromatographic analyzer, affecting the normal operation of the instrument. Dust entering the instrument may cause blockage or interfere with the detection signal. Mechanical vibration may cause the precision components inside the instrument (such as chromatographic columns, detectors, etc.) to shift or be damaged, thereby affecting the accuracy and stability of the detection.

[0004] Therefore, there is an urgent need for an online oil well associated gas component analysis device and method with a circulating suction function at the wellhead, so as to realize online accurate, reliable and real-time detection and analysis of the associated gas components at the wellhead and ensure the safe production of the oil field. Summary of the invention

[0005] In order to solve the technical problems in the prior art such as the inability to realize wellhead online detection and analysis of oilfield associated gas components and insufficient detection accuracy, the present application provides a wellhead online analysis system and method for oilfield associated gas components.

[0006] In order to solve the above technical problems, this application adopts the following technical solutions:

[0007] An oilfield associated gas component wellhead online analysis system, comprising:

[0008] A circulating pumping unit, which includes an electric valve, a gas-liquid separation tank and a circulating pump connected in sequence, and is used to remove the remaining well fluid and gas in the system, pump the real-time well fluid and gas into the system, and allow the fresh well fluid and gas to settle;

[0009] An oilfield associated gas component analysis unit, the oilfield associated gas component analysis unit is connected to the gas-liquid separation tank, the oilfield associated gas component analysis unit comprises a pressure reducing valve, an electric valve and a gas component detection element connected in sequence, and the unit is used to process the oilfield associated gas and perform component analysis on the gas;

[0010] A reflux unit, the reflux unit comprising a retained liquid reflux unit and a retained waste gas exhaust unit, the retained liquid reflux unit is connected to the gas-liquid separation tank and used to reflux the retained liquid into the gas-liquid separation tank, and the retained waste gas exhaust unit is connected to the oilfield associated gas component analysis unit and used to exhaust the gas after component analysis;

[0011] The circulating pumping unit, the oilfield associated gas component analysis unit and the reflux unit are arranged on a sealed sampling loop formed at the wellhead sampling location;

[0012] The remote control unit is respectively connected with the circulation pumping unit, the oilfield associated gas component analysis unit and the reflux unit by electrical signals.

[0013] Further, specifically, the present application can set a sampling port near the wellhead of the associated gas component of the oil field, and the sampling port is provided with a pipeline, and the pipeline forms a sealed sampling loop.

[0014] Furthermore, the oilfield associated gas component analysis unit also includes a filter, an electronic condenser and a waste gas buffer tank, and the filter and the electronic condenser are respectively arranged on the pipeline between the gas-liquid separation tank and the gas component detection element, and the waste gas buffer tank is connected to the gas component detection element through a pipeline.

[0015] Furthermore, the retained liquid reflux unit includes an electric valve, and the electric valve is arranged on the pipeline between the gas-liquid separation tank and the condenser.

[0016] Furthermore, the accumulated exhaust gas discharge unit includes a boost pump and an electric valve, and the boost pump and the electric valve are connected to the exhaust gas buffer tank in sequence through pipelines.

[0017] Secondly, the present application also provides an online wellhead analysis method for associated gas components in an oil field, comprising the following steps:

[0018] Remove the remaining well fluid and gas in the system through the remote control unit, pump the real-time well fluid and gas into the system, and close the circulating suction unit through the remote control unit to allow the fresh well fluid and gas to settle;

[0019] The oilfield associated gas component analysis unit is turned on through the remote control unit to process the oilfield associated gas and perform component analysis on the gas. The signal processing and communication module reads and processes the gas analysis data, and the data is stored in the cloud through the remote control unit;

[0020] After data collection is completed, the retained liquid is returned to the gas-liquid separation tank through the remote control unit, and the retained waste gas after analysis is discharged.

[0021] Furthermore, the method of removing the remaining well fluid and gas in the system and pumping the real-time well fluid and gas into the system may specifically include:

[0022] Through the remote control unit, the electric valve is controlled to open to form a loop, the circulation pump is controlled to work and maintain the set working time, the remaining well fluid and gas in the gas-liquid separation tank are removed, and then the real-time well fluid and gas are pumped into the gas-liquid separation tank; the electric valve and the circulation pump are closed through the remote control unit, and the time is set to allow the fresh well fluid and gas to settle.

[0023] Furthermore, the method for processing oilfield associated gas and performing component analysis on the gas may include:

[0024] The electric valve is opened by the remote control unit, and the gas in the settling tank passes through the pressure reducing valve, electric valve, filter, and electronic condenser in sequence to process the oilfield associated gas. The processed gas enters the gas component detection unit to perform component analysis on a single or multiple gas groups.

[0025] The signal processing and communication module reads and processes the gas analysis data, and stores the data in the cloud through the remote control unit. After the gas components are analyzed, the gas enters the exhaust gas buffer tank.

[0026] Further, the method of causing the retained liquid to flow back into the gas-liquid separation tank and simultaneously exhausting the retained waste gas may include:

[0027] After data collection is completed, the electric valve is opened through the remote control unit to allow the liquid accumulated in the filter to flow back to the gas-liquid separation tank, and the electric valve is closed according to the set time;

[0028] The electric valve and booster pump are opened through the remote control unit, and negative pressure is formed in the system to discharge the accumulated exhaust gas in the exhaust gas buffer tank and wait for the next detection cycle.

[0029] The present application provides an online wellhead analysis system for oilfield associated gas components, which can realize online wellhead detection and analysis of oilfield associated gas components. Compared with the prior art, the technical solution provided by the present application has the following beneficial effects:

[0030] First, this application provides an online wellhead analysis system and method for associated gas components in oil fields, which can perform sedimentation separation, primary decompression, oil-water separation, secondary decompression, and deep dehydration in a closed space in sequence, reaching the standard working conditions for analyzing the content of hydrocarbon components, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, oxygen and other gas components in associated gas; the online analysis system and method provided by this application can effectively improve the efficiency of gas collection, and can perform real-time analysis of associated gas components and quickly read data at the required frequency, greatly shortening the detection cycle, realizing online closed sampling and detection analysis of associated gas, and ensuring the accuracy of the analysis results. And the whole process is implemented in a closed manner, and no external discharge can be generated to prevent harm to construction personnel and the environment.

[0031] Secondly, the circulating suction function of the circulating suction unit provided in the present application improves the gas-liquid collection efficiency. After the gas-liquid mixed medium to be detected and analyzed enters the gas-liquid separation tank, it is settled according to the set time of the control system. During this process, in a closed environment, the gas and liquid form natural sedimentation, and the gas will be concentrated in the upper space of the gas-liquid separation tank, ultimately allowing the gas and liquid to complete effective sedimentation and separation.

[0032] Secondly, the oilfield associated gas component analysis unit provided by the present application removes impurities and moisture that affect the analysis results through pressure stabilization, filtration and drying, thereby improving the analysis accuracy. Specifically, the pressure of the system is stabilized by the pressure reducing valve, further ensuring the accuracy of the analysis of other components; the filter of the unit removes solid particles, impurities and moisture in the associated gas to prevent it from damaging the subsequent analysis equipment; the gas phase medium to be detected still contains a large amount of saturated water vapor components, and the condenser of the unit dries the gas to deeply remove gaseous water and improve the accuracy of the analysis results.

[0033] Again, the reflux unit provided in the present application includes a retained liquid reflux unit and a retained waste gas emptying unit. In the later stage of a detection and analysis cycle, the retained liquid in the filter can be refluxed to the gas-liquid separation tank, and the retained waste gas in the waste gas buffer tank can be emptied, thereby realizing the function of zero emission in the whole process and further improving the accuracy and reliability of the analysis of associated gas components in oil fields.

[0034] Finally, the wellhead online analysis system and method for associated gas components in oil fields provided by the present application can be used to detect changes in associated gas in neighboring wells (neighboring wells of oil field fire-burned oil layer operating wells). The detected gas changes help to adjust the oil production process parameters, such as gas injection rate, air and fuel ratio, etc., so as to achieve the best oil production effect. Therefore, the wellhead online analysis system and method for associated gas components provided by the present application plays an important guiding role in the oil field production process.

[0035] It can be seen from the above technical solutions that the wellhead online analysis system for associated gas components in oil fields provided by the present application has an overall stable gas supply, which ensures that the analysis equipment can obtain associated gas in real time and at a stable flow rate, and can perform real-time analysis of associated gas components and quickly read data at the required frequency, thereby realizing online closed sampling, detection and analysis of associated gas, and ensuring the accuracy of the analysis results, thereby improving the reliability and accuracy of online gas analysis, and playing an important guiding role in oil field production technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the wellhead online analysis system for oilfield associated gas components provided for this application;

[0037] Figure 2 A graph showing changes in associated gas components in adjacent wells within a certain time range is provided for the embodiment of the present application.

[0038] In the figure: 1. Wellhead; 2. Pressure detection port; 3. Signal processing and communication module; 4. Remote control unit; 5. Electric valve one; 6. Gas-liquid separation tank; 7. Pressure reducing valve one; 8. Electric valve three; 9. Filter; 10. Pressure reducing valve two; 11. Electric valve four; 12. Circulation pump; 13. Electronic condenser; 14. Gas component detection component; 15. Waste gas buffer tank; 16. Booster pump; 17. Electric valve five; 18. Electric valve two. DETAILED DESCRIPTION

[0039] The present invention discloses a wellhead online analysis system and method for associated gas components in oil fields. Those skilled in the art can refer to the content of this article and appropriately improve the system components or process parameters to achieve it. It should be particularly noted that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0040] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0041] like Figure 1 As shown, the present application provides an online wellhead analysis system for associated gas components in an oil field, specifically comprising:

[0042] A circulating pumping unit, which includes an electric valve 1 5, a gas-liquid separation tank 6, a circulating pump 12 and an electric valve 2 18 connected in sequence, and is used to remove the remaining well fluid and gas in the system, pump the real-time well fluid and gas into the system, and allow the fresh well fluid and gas to settle;

[0043] An oilfield associated gas component analysis unit, the oilfield associated gas component analysis unit is connected to the gas-liquid separation tank 6, the oilfield associated gas component analysis unit comprises a pressure reducing valve 1 7, an electric valve 3 8, a pressure reducing valve 2 10 and a gas component detection element 14 connected in sequence, and the unit is used to process the oilfield associated gas and perform component analysis on the gas;

[0044] A reflux unit, the reflux unit comprising a retained liquid reflux unit and a retained waste gas exhaust unit, the retained liquid reflux unit is connected to the gas-liquid separation tank 6, and is used to reflux the retained liquid into the gas-liquid separation tank 6, and the retained waste gas exhaust unit is connected to the oilfield associated gas component analysis unit, and is used to exhaust the gas after component analysis;

[0045] The circulating pumping unit, the oilfield associated gas component analysis unit and the reflux unit are arranged on a sealed sampling loop formed at the sampling location of the wellhead 1;

[0046] The remote control unit 4 is respectively connected to the circulation pumping unit, the oilfield associated gas component analysis unit and the reflux unit via electrical signals.

[0047] In a specific embodiment, the present application can set a sampling port near the wellhead 1 of the associated gas component of the oil field, and the sampling port is provided with a pipeline, the pipeline forms a sealed sampling loop, and each unit of the online analysis system is respectively arranged on the sealed sampling loop.

[0048] In a preferred embodiment, the oilfield associated gas component analysis unit also includes a filter 9, an electronic condenser 13 and a waste gas buffer tank 15, and the filter 9 and the electronic condenser 13 are respectively arranged on the pipeline between the gas-liquid separation tank 6 and the gas component detection element 14, and the waste gas buffer tank 15 is connected to the gas component detection element 14 through a pipeline.

[0049] In a preferred embodiment, the retained liquid reflux unit includes an electric valve four 11, and the electric valve four 11 is arranged on the pipeline between the gas-liquid separation tank 6 and the condenser.

[0050] In a preferred embodiment, the accumulated exhaust gas discharge unit includes a booster pump 16 and an electric valve 5 17, and the booster pump 16 and the electric valve 5 17 are connected to the exhaust gas buffer tank 15 in sequence through a pipeline.

[0051] Another invention object of the present application is to provide a method for online wellhead analysis of associated gas components in an oil field, comprising the following steps:

[0052] Remove the remaining well fluid and gas in the system through the remote control unit, pump the real-time well fluid and gas into the system, and close the circulating suction unit through the remote control unit to allow the fresh well fluid and gas to settle;

[0053] The oilfield associated gas component analysis unit is turned on through the remote control unit to process the oilfield associated gas and perform component analysis on the gas. The signal processing and communication module reads and processes the gas analysis data, and the data is stored in the cloud through the remote control unit;

[0054] After data collection is completed, the retained liquid is refluxed into the gas-liquid separation tank through the remote control unit, and the retained waste gas is discharged at the same time.

[0055] In a preferred embodiment, the method of removing the remaining well fluid and gas in the system and pumping the real-time well fluid and gas into the system may specifically include:

[0056] Through the remote control unit 4, the electric valve 1 5 and the electric valve 2 18 are controlled to open, the system forms a loop, and the circulation pump 12 is controlled to work and maintain the set working time, the remaining well fluid and gas in the gas-liquid separation tank 6 are removed, and then the real-time well fluid and gas are pumped into the gas-liquid separation tank 6; the electric valve 1 5, the electric valve 2 18 and the circulation pump 12 are closed through the remote control unit 4, and the time is set to allow the fresh well fluid and gas to settle.

[0057] In a preferred embodiment, the method for processing oilfield associated gas and performing component analysis on the gas may include:

[0058] The remote control unit 4 controls the opening of the electric valve three 8, and the gas in the sedimentation tank sequentially passes through the pressure reducing valve one 7, the electric valve three 8, the filter 9, the pressure reducing valve two 10 and the electronic condenser 13 to process the oilfield associated gas, and the treated gas enters the gas component detection part 14 to analyze the components of a single or multiple groups of gases; the signal processing and communication module 3 reads and processes the gas analysis data, and stores the data to the cloud through the remote control unit 4, and the gas enters the exhaust gas buffer tank 15 after the gas component analysis. Specifically, the gas component detection part 14 can select a single or multiple gas component probes, including but not limited to electrochemical and infrared gas detection principle probes.

[0059] In a preferred embodiment, the method of returning the retained liquid to the gas-liquid separation tank 6 and exhausting the retained waste gas may include:

[0060] After data collection is completed, the remote control unit 4 controls the opening of the electric valve 4 11 to allow the liquid accumulated in the filter 9 to flow back to the gas-liquid separation tank 6, and the electric valve 4 11 is closed at the set time; the remote control unit 4 controls the opening of the electric valve 5 17 and the booster pump 16 to form a negative pressure in the system, and the accumulated waste gas in the waste gas buffer tank 15 is emptied to stand by for the next detection cycle. Before the next detection and analysis cycle begins, the electric valve 1 5, the electric valve 2 18 and the circulation pump 12 are opened to empty the remaining gas and liquid in the gas-liquid separation tank and re-inhale fresh gas and liquid.

[0061] Effect Example

[0062] 1.1 The wellhead online analysis system and method for oilfield associated gas components provided in this application are used to analyze wellhead gas online. The reliability and accuracy of the online analysis system and method are shown in Table 1, which shows the detection technical indicators, detection accuracy and other data of the wellhead oilfield associated gas.

[0063] Table 1 Technical indicators and accuracy data of gas detection for each component of associated gas

[0064] Wellhead oilfield associated gas components Detection and analysis probe range Detection and analysis probe resolution Accuracy Detection and analysis probe <![CDATA[H2S]]> 0-200, 500, 1000 PPM 0.1, 1ppm ≤±1％ Electrochemistry <![CDATA[CH4]]> 0-10, 20% vol, 100% 0.01%vol ≤±1％ Infrared <![CDATA[CO2]]> 0-5000ppm 1ppm ≤±1％ Infrared <![CDATA[O2]]> 0-25%vol 0.01%vol ≤±1％ Electrochemistry CO 0-500, 1000PPM 0.1ppm ≤±2％ Electrochemistry <![CDATA[N2]]> 0-100%vol 0.01%vol ≤±3％ Electrochemistry

[0065] The data in Table 1 show that the wellhead online analysis system and method for oilfield associated gas components provided by the present application has good reliability and accuracy in online detection and analysis of oilfield associated gas components.

[0066] 1.2 In the process of oil field fire burning, the composition and production changes of associated gas are important indicators for evaluating the effect of fire burning, which plays an important guiding role in special oil production processes such as oil field fire burning.

[0067] The composition and quantity of gas produced by oil layer combustion will change as the combustion front advances, which can be used to determine whether the combustion is carried out in the expected area and whether the combustion is sufficient. For example, if the oxygen content in the associated gas from the adjacent well is too high, it means that the oil layer is not burning fully; if the content of combustion products such as carbon dioxide increases and conforms to the expected trend of change, it means that the oil layer burning process is being carried out effectively. Therefore, gas component detection and analysis data can help adjust process parameters according to the detection results, such as gas injection rate, air and fuel ratio, etc., to achieve the best oil recovery effect;

[0068] By using the gas online analysis system and method provided in this application to detect the changing law of the component content in the associated gas of the adjacent wells of the ignition oil well, the process parameters of the ignition well can be adjusted in time to ensure the success of the oil production process: This application detects and analyzes the associated gas components of the adjacent wells of the fire-burned oil layer operating wells from May 19, 2024 to November 16, 2024. The analysis results are as follows Figure 2 shown. Figure 2 It shows that according to the real-time changes of the associated gas components in the adjacent wells, the process parameters of the ignition well were adjusted in time, and a good ignition effect was achieved; the initial ignition effect was not yet stable, and the degree of CH4 participating in the combustion was not high. With the implementation of the process, more and more CH4 and O2 in the injected air participated in the combustion process to produce CO2, and the ratio relative to N2 became higher and higher. The CH4 content was high at the beginning, and the content became less and less as the process was implemented.

[0069] It can be seen from this that the wellhead online analysis system and method for associated gas components in oil fields provided by the present application can effectively detect changes in associated gas in adjacent wells of wells undergoing a fire-burning oil layer process, and effectively adjust subsequent oil production process parameters (such as gas injection rate, air and fuel ratio, etc.) through changes in associated gas in adjacent wells, so as to achieve the best oil production effect. Therefore, the wellhead online analysis system and method for associated gas components provided by the present application play an important guiding role in special oil production processes in oil fields such as fire-burning oil layers.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An online wellhead analysis system for associated gas components in oil fields, characterized in that: include: A circulating pumping unit, which includes an electric valve, a gas-liquid separation tank and a circulating pump connected in sequence, and is used to remove the remaining well fluid and gas in the system, pump the real-time well fluid and gas into the system, and allow the fresh well fluid and gas to settle; An oilfield associated gas component analysis unit, the oilfield associated gas component analysis unit is connected to the gas-liquid separation tank, the oilfield associated gas component analysis unit comprises a pressure reducing valve, an electric valve and a gas component detection element connected in sequence, and the unit is used to process the oilfield associated gas and perform component analysis on the gas; A reflux unit, the reflux unit comprising a retained liquid reflux unit and a retained waste gas exhaust unit, the retained liquid reflux unit is connected to the gas-liquid separation tank and used to reflux the retained liquid into the gas-liquid separation tank, and the retained waste gas exhaust unit is connected to the oilfield associated gas component analysis unit and used to exhaust the gas after component analysis; The circulating pumping unit, the oilfield associated gas component analysis unit and the reflux unit are arranged on a sealed sampling loop formed near the wellhead sampling; The remote control unit is respectively connected with the circulation pumping unit, the oilfield associated gas component analysis unit and the reflux unit by electrical signals.

2. The system according to claim 1, characterized in that A sampling port is arranged at the wellhead, and a pipeline is arranged at the sampling port, and the pipeline forms a sealed sampling loop.

3. The system according to claim 1, characterized in that The oilfield associated gas component analysis unit also includes a filter, an electronic condenser and a waste gas buffer tank. The filter and the electronic condenser are sequentially arranged on the pipeline between the gas-liquid separation tank and the gas component detection element. The waste gas buffer tank is connected to the gas component detection element through a pipeline.

4. The system according to claim 3, characterized in that The retained liquid reflux unit comprises an electric valve, and the electric valve is arranged on a pipeline between the gas-liquid separation tank and the condenser.

5. The system according to claim 3, characterized in that The accumulated exhaust gas discharge unit comprises a booster pump and an electric valve, and the booster pump and the electric valve are sequentially connected to the exhaust gas buffer tank through pipelines.

6. A method for online wellhead analysis of associated gas components in an oil field, characterized in that: The steps include: Remove the remaining well fluid and gas in the system through the remote control unit, pump the real-time well fluid and gas into the system, and close the circulating suction unit through the remote control unit to allow the fresh well fluid and gas to settle; The oilfield associated gas component analysis unit is turned on through the remote control unit to process the oilfield associated gas and perform component analysis on the gas. The signal processing and communication module reads and processes the gas analysis data, and the data is stored in the cloud through the remote control unit; After data collection is completed, the retained liquid is returned to the gas-liquid separation tank through the remote control unit, and the retained waste gas after analysis is discharged.

7. A method for online wellhead analysis of associated gas components in an oil field as claimed in claim 6, characterized in that: Eliminate the remaining well fluid and gas in the system, and pump the real-time well fluid and gas into the system including: Through the remote control unit, the electric valve is controlled to open to form a loop, the circulation pump is controlled to work and maintain the set working time, the remaining well fluid and gas in the gas-liquid separation tank are removed, and then the real-time well fluid and gas are pumped into the gas-liquid separation tank; The electric valve and circulation pump are closed by the remote control unit, and the time is set to allow fresh well fluid and gas to settle.

8. A method for online wellhead analysis of associated gas components in an oilfield as claimed in claim 6, characterized in that: Processing of oilfield associated gas and analysis of gas components include: The electric valve is opened by the remote control unit, and the gas in the settling tank passes through the pressure reducing valve, electric valve, filter, and electronic condenser in sequence to process the oilfield associated gas. The processed gas enters the gas component detection unit to perform component analysis on a single or multiple gas groups. The signal processing and communication module reads and processes the gas analysis data, and stores the data in the cloud through the remote control unit. After the gas components are analyzed, the gas enters the exhaust gas buffer tank.

9. A method for online wellhead analysis of associated gas components in an oilfield as claimed in claim 6, characterized in that: The method of causing the retained liquid to flow back into the gas-liquid separation tank and simultaneously causing the retained waste gas to be emptied includes: After data collection is completed, the electric valve is opened through the remote control unit to allow the liquid accumulated in the filter to flow back to the gas-liquid separation tank, and the electric valve is closed according to the set time; The electric valve and booster pump are opened through the remote control unit, and negative pressure is formed in the system to discharge the accumulated exhaust gas in the exhaust gas buffer tank and wait for the next detection cycle.

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