Gas field feed gas on-line sampling and separating device and method

Abstract

The invention discloses a gas field feed gas online sampling and separating device and method, and relates to the technical field of gas sampling. The gas field raw material gas on-line sampling and separating device comprises a raw material gas gathering and transporting mechanism, a raw material gas sampling mechanism and a sample collecting and processing mechanism, the raw material gas gathering and transporting mechanism comprises a main pipeline, the main pipeline is connected with a gas taking pipeline and a gas returning pipeline, the raw material gas sampling mechanism comprises a sampling pipeline, and a spoiler and a sampling inner pipe are arranged in the sampling pipeline; the sample flowing chamber is connected with a sample pipeline, the sample collecting and processing mechanism comprises a sample gas pipeline, the sample gas pipeline is connected with a three-way valve, the three-way valve is connected with a collecting bottle and a separator, the separator is connected with a filter, and the filter is connected with an emptying pipeline. The gas field feed gas on-line sampling and separating device is adopted in the gas field feed gas on-line sampling and separating method. The gas field feed gas on-line sampling and separating device and method have the beneficial effects of good sampling representativeness and on-line sampling.

Description

Technical Field

[0001] This invention relates to the field of gas sampling technology, specifically to an online sampling and separation device and method for raw gas from gas fields. Background Technology

[0002] Natural gas is a high-quality, efficient, green, and clean low-carbon energy source. Accelerating the utilization of natural gas and increasing its proportion in primary energy consumption is the only way to steadily advance the energy consumption revolution and build a clean, low-carbon, safe, and efficient modern energy system. The separation efficiency of the gathering and transportation system has a significant impact on downstream equipment, necessitating its evaluation. Incomplete separation of the solid and liquid phases in the feed gas often affects the safe and efficient operation of the ground system. Currently, some gas gathering stations are experiencing frequent compressor shutdowns, primarily caused by upstream water and sand contamination damaging sealing equipment such as piston rings and valves. Therefore, it is necessary to evaluate the separation effect of the feed gas gathering and transportation process system to propose optimization suggestions. Sampling the feed gas gathering and transportation system is challenging, and sample representativeness needs further improvement; sampling equipment is still under development. In evaluating the separator's effectiveness, determining the solid-liquid phase content is a crucial step to accurately assess separation efficiency; therefore, representative samples need to be taken from the separation system.

[0003] Currently, most sampling devices for natural gas gathering and transportation systems target the gas itself, with limited consideration given to sampling and separating solid-liquid mixtures in multiphase media sampling techniques for feedstock gas gathering and transportation systems. For example, CN117740479A discloses a natural gas sampling and testing device, including a steel cylinder with an inlet and an outlet. Both ends of the cylinder's inner cavity are equipped with vent pipes for inlet and outlet gas, and the cylinder also contains a push-pull mechanism for extracting or discharging natural gas. This allows for natural gas sampling, but it cannot separate the sample online. Therefore, existing natural gas sampling technologies have certain limitations, failing to consider natural gas with solid-liquid mixtures, resulting in samples that are not representative.

[0004] Therefore, existing technologies need to be improved. Summary of the Invention

[0005] The technical problem to be solved by this invention is that natural gas sampling technology has significant limitations, and the samples taken are not representative. The purpose is to provide an online sampling and separation device and method for gas field feedstock gas, which adopts a corresponding technical solution and has the beneficial effects of better sample representativeness and online sampling.

[0006] This invention is achieved through the following technical solution:

[0007] An online sampling and separation device for gas field feedstock gas includes a feedstock gas gathering and transportation mechanism, a feedstock gas sampling mechanism, and a sample collection and processing mechanism.

[0008] The raw gas gathering and transportation mechanism includes a main pipeline, which is connected to a gas intake pipeline and a gas return pipeline.

[0009] The raw material gas sampling mechanism includes a sampling pipe, the inlet of which is connected to the outlet of the gas sampling pipe. Inside the sampling pipe, a flow disruptor and an inner sampling tube are sequentially arranged along the flow direction. A sample flow chamber is formed between the inner sampling tube and the sampling pipe. The sample flow chamber is connected to a sample pipe. The outlet of the inner sampling tube is connected to the inlet of the return gas pipe.

[0010] The sample collection and processing mechanism includes a sample gas pipeline connected to the sample pipeline, a three-way valve connected to the sample gas pipeline, a collection bottle and a separator connected to the three-way valve, a filter connected to the separator, and a venting pipeline connected to the filter.

[0011] Furthermore, in this invention, a main valve is provided on the main pipeline between the gas intake pipeline and the gas return pipeline, a gas intake valve is provided on the gas intake pipeline, and a gas return valve is provided on the gas return pipeline.

[0012] Furthermore, in this invention, a gas intake pressure gauge is provided on the downstream side of the gas intake valve in the gas intake pipe, and a return gas pressure gauge is provided on the upstream side of the return gas valve in the return gas pipe.

[0013] Furthermore, in this invention, the pipeline connecting the separator and the three-way valve is sequentially equipped with a separation gas pressure gauge, a separation gas temperature gauge, and a separation gas pressure reducing valve, and the pipeline connecting the collection bottle and the three-way valve is sequentially equipped with a sample gas pressure reducing valve, a sample gas pressure gauge, and a sample gas temperature gauge.

[0014] Furthermore, in this invention, the pipe connecting the separator and the three-way valve is provided with a visualization pipe, and a sampling valve is provided at the inlet of the visualization pipe.

[0015] Furthermore, in this invention, the inlet and outlet of the collection bottle are respectively equipped with an inlet valve and an outlet valve.

[0016] Furthermore, in this invention, the vent pipe is equipped with a flow meter and a pressure reducing valve.

[0017] Furthermore, in this invention, the aforementioned multiple sample pipes are combined and connected to a single sample pipe, the combined sample pipe is connected to the sample gas pipeline, and the combined sample pipe is equipped with a pressure relief valve.

[0018] Furthermore, in this invention, the aforementioned non-merged sample pipeline is equipped with a sample valve.

[0019] A method for online sampling and separation of feedstock gas from a gas field, comprising an online sampling and separation device for feedstock gas from a gas field, and further comprising the following methods.

[0020] Confirm that all valves in the raw gas sampling mechanism and the sample collection and processing mechanism are closed.

[0021] Next, open the gas sampling valve and observe the gas sampling pressure gauge. Once the reading stabilizes, open the gas return valve. After the reading on the gas return pressure gauge stabilizes, close the main valve. Open an appropriate number of sample valves as needed and control the three-way valve to connect the collection bottle. The raw material gas flows into the collection bottle to achieve sample collection.

[0022] The next step is to depressurize the sample collection and processing mechanism after sampling and collection is completed by using the sample gas pressure reducing valve and the separation gas pressure reducing valve. Then, the three-way valve and the sample valve are closed in sequence, the main valve is opened, and the gas intake valve and the gas return valve are closed.

[0023] Finally, open the sample valve and the pressure relief valve to allow the raw material gas sampling mechanism to release pressure to the same level as atmospheric pressure.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] (1) The turbulent flow device makes the mixed solid-liquid gas flow turbulent and uniformly distributed, making the gas entering the sample pipeline more representative. Therefore, this invention can improve the representativeness of multi-media sampling of raw gas, realize online sampling of multiphase flow media in the gas field raw gas gathering and transportation system, and realize sampling of sample gas and separated gas of gas field raw gas, which has the advantages of multiple functions.

[0026] (2) It can examine the representativeness of samples at different angles near the pipe wall of the sampling pipeline, and the sampling analysis results can be used to accurately evaluate the operating status and efficiency of the separation and filtration equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0028] Figure 1 This is a schematic diagram of the online sampling and separation device for gas field feedstock gas of the present invention;

[0029] Figure 2 This is a schematic diagram of the raw gas sampling mechanism of the present invention;

[0030] Figure 3This is a schematic diagram of the sample collection and processing mechanism of the present invention;

[0031] Figure 4 This is a cross-sectional schematic diagram of the raw gas sampling mechanism of the present invention;

[0032] Figure 5 This is a schematic diagram of the sample channel of the present invention.

[0033] The attached diagram shows the markings and corresponding component names: 1-Raw gas gathering and conveying mechanism, 11-Main pipeline, 111-Gas intake tee, 112-Main valve, 113-Auxiliary valve, 114-Return gas tee, 12-Gas intake pipeline, 121-Gas intake valve, 122-Gas intake pressure gauge, 123-Pipeline flange one, 13-Return gas pipeline, 131-Return gas valve, 132-Return gas pressure gauge, 133-Pipeline flange two, 2-Raw gas sampling mechanism, 21-Sampling pipeline, 22-Flow turbulence generator, 23-Sampling inner tube, 24-Sample flow chamber, 25-Sample valve. 26-Pressure relief valve, 27-Sample pipeline, 3-Sample collection and processing mechanism, 31-Sample gas pipeline, 32-Three-way valve, 331-Sample gas pressure gauge, 332-Separation gas pressure gauge, 341-Sample gas temperature gauge, 342-Separation gas temperature gauge, 351-Inlet valve, 352-Outlet valve, 353-Collection bottle, 361-Sampling valve, 362-Visualization tube, 363-Separator, 364-Filter, 365-Flow meter, 366-Pressure reducing valve, 367-Vent pipeline, 371-Sample gas pressure reducing valve, 372-Separation gas pressure reducing valve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Example 1

[0037] Combination Figure 1 As shown, the online sampling and separation device for gas field feedstock gas in this embodiment of the invention mainly includes a feedstock gas gathering and transportation mechanism 1, a feedstock gas sampling mechanism 2, and a sample collection and processing mechanism 3. The feedstock gas gathering and transportation mechanism 1 is a section of the transport pipeline in the existing gas field feedstock gas gathering and transportation system, used to transport feedstock gas. The feedstock gas sampling mechanism 2 is used to collect a portion of the feedstock gas as a sample. The sample collection and processing mechanism 3 can transport the portion of feedstock gas collected by the feedstock gas sampling mechanism 2 into a collection bottle 353 for collection and storage, facilitating subsequent analysis. The online sampling and separation device for gas field feedstock gas can directly sample from a section of the transport pipeline in the gas field feedstock gas gathering and transportation system, making it very convenient to use.

[0038] In some implementations of this embodiment, combined with Figure 1 As shown, the raw gas gathering and transportation mechanism 1 in this embodiment is mainly composed of a main pipeline 11. The main pipeline 11 is a section of the transportation pipeline of the gas field raw gas gathering and transportation system in the prior art. Along the main pipeline 11 from upstream to downstream, a gas intake tee 111, a main valve 112, a secondary valve 113 and a return gas tee 114 are installed in sequence. The main valve 112 and the secondary valve 113 are used to control the flow or cut-off of gas in the main pipeline 11.

[0039] Furthermore, in combination Figure 1 As shown, a gas intake tee 111 is connected to a gas intake pipe 12. A gas intake valve 121 and a gas intake pressure gauge 122 are installed on the gas intake pipe 12. The gas intake valve 121 is located upstream of the gas intake pressure gauge 122. The gas intake valve 121 controls the flow or cut-off of gas within the gas intake pipe 12, and the gas intake pressure gauge 122 is used to detect the pressure within the gas intake pipe 12. A pipe flange 123 is installed at the outlet end of the gas intake pipe 12 for detachable connection to other pipes.

[0040] Furthermore, combining Figure 1As shown, a return gas tee 114 is connected to a return gas pipe 13. A return gas valve 131 and a return gas pressure gauge 132 are installed on the return gas pipe 13. The return gas valve 131 is located downstream of the return gas pressure gauge 132. The return gas valve 131 controls the flow or cut-off of gas in the return gas pipe 13, and the return gas pressure gauge 132 is used to detect the pressure inside the return gas pipe 13. A pipe flange 133 is installed at the inlet end of the return gas pipe 13 for detachable connection to other pipes.

[0041] In some implementations of this embodiment, combined with Figure 1 and Figure 2 As shown, the raw material gas sampling mechanism 2 includes a sampling pipe 21. The flange at the inlet end of the sampling pipe 21 and pipe flange 123 are fixedly connected, allowing gas in the sampling pipe 12 to flow into the sampling pipe 21. An inner sampling tube 23 is installed inside the sampling pipe 12. The cavity formed between the outer wall of the inner sampling tube 23 and the inner wall of the sampling pipe 12 is a sample flow chamber 24. During the flow process, part of the raw material gas enters the inner sampling tube 23, and the other part enters the sample flow chamber 24. The flange at the outlet end of the inner sampling tube 23 and pipe flange 133 are fixedly connected.

[0042] Furthermore, in combination Figure 2 and Figure 4 As shown, the right port of the sample flow chamber 24 is an annular outlet, and four sample channels 27 are connected to the right port. Combined with... Figure 5 As shown, the sample conduit 27 comprises two parts: an arc-shaped triangular plate and a circular tube. The internal cavity of the triangular plate is connected to the circular tube. The ends of the four arc-shaped triangular plates form a ring, connecting the ends of the arc-shaped triangular plates to the right port of the sample flow chamber 24, allowing the raw material gas in the sample flow chamber 24 to enter the four sample conduits 27. Figure 4 As shown, different angles of raw gas can be selected for collection as needed. For example, the raw gas in the upper left corner of the sampling pipe 21 can be collected, or the raw gas in the upper right and lower right corners of the sampling pipe 21 can be collected. The collection is flexible and the effect is better.

[0043] It should be noted that the inner wall of the bracket-shaped triangular plate and the outer wall of the sampling inner tube 23 are fixedly connected by welding. Furthermore, each circular tube is equipped with a sample valve 25, allowing for convenient individual sampling of the raw material gas from a single side. Figure 2 As shown, the circular tubes of four sample tubes 27 are connected to the circular tube of one sample tube 27. The combined sample tube 27 is equipped with a pressure relief valve 26, which is used to reduce pressure.

[0044] Combination Figure 2As shown, the flow disruptor 22 is disc-shaped and installed inside the sampling pipe 21, with the flow disruptor 22 located on the upstream side of the sampling inner tube 23. The flow disruptor 22 has several through-holes with random orientations; for example, some holes are tilted upwards, some downwards, some to the left, and some to the right. The distribution of these holes is also random and irregular, resulting in a chaotic and disordered flow direction of the raw material gas passing through the flow disruptor 22. The flow disruptor 22 disturbs the raw material gas, ensuring a more uniform distribution of the gas within the sampling pipe 21, thus achieving better sampling results.

[0045] In some implementations of this embodiment, combined with Figure 2 and Figure 3 As shown, the sample collection and processing mechanism 3 mainly includes a sample gas pipeline 31, the inlet end of the sample gas pipeline 31 is connected to the outlet of a combined sample pipeline 27, and the raw material gas in the sample pipeline 27 can flow into the sample gas pipeline 31.

[0046] Furthermore, such as Figure 3 As shown, a three-way valve 32 is installed on the sample gas pipeline 31. The three-way valve 32 is connected to a horizontally extending pipe to the right and a horizontally extending vent pipe 367. The horizontally extending pipe to the right is equipped with a sample gas pressure reducing valve 371, a sample gas pressure gauge 331, and a sample gas temperature gauge 341 in sequence from upstream to downstream. The end of the horizontally extending pipe to the right is connected to a collection bottle 353, which is used to store raw material gas / sample gas. An inlet valve 351 is installed at the left inlet of the collection bottle 353, and an outlet valve 352 is installed at the right outlet, which control the opening and closing states of the inlet and outlet of the collection bottle 353, respectively.

[0047] The separated gas formed after the raw gas in the vent pipe 367 is separated and filtered can be directly discharged into the air, or it can be collected by connecting a gas collection device at the end of the vent pipe 367.

[0048] Furthermore, combining Figure 3 As shown, a horizontally extending downward vent pipe 367 is equipped with, in sequence from upstream to downstream, a separator gas pressure gauge 332, a separator gas temperature gauge 342, a separator gas pressure reducing valve 372, and a visualization tube 362. A sampling valve 361 is installed at the inlet of the visualization tube 362. The visualization tube 362 is made of transparent material for easy observation of its internal components. Downstream of the visualization tube 362, a separator 363, a filter 364, a flow meter 365, and a pressure reducing valve 366 are installed in sequence.

[0049] Example 2

[0050] This embodiment provides an online sampling and separation method for gas field feedstock gas, using the online sampling and separation device for gas field feedstock gas in Embodiment 1. The specific method is as follows.

[0051] Combination Figure 1 and Figure 2 As shown, first confirm that the gas intake valve 121 and the gas return valve 131 are closed. Confirm that there is no abnormal pressure in the gas intake pipe 12 and the gas return pipe 13 by checking the pressure gauges 122 and 132. Then, remove pipe flange 123 and pipe flange 133. Connect the inlet end of the sampling pipe 21 to the gas intake pipe 12, and connect the outlet end of the sampling inner pipe 23 to the gas return pipe 13. Connect the sample pipe 27 and the sample gas line 31 to achieve communication between the raw material gas sampling mechanism 2 and the sample collection and processing mechanism 3.

[0052] First, confirm that all valves of the raw material gas sampling mechanism 2 and the sample collection and processing mechanism 3 are in the closed state. Open the gas sampling valve 121, observe the reading of the gas sampling pressure gauge 122, and after the reading stabilizes, open the return gas valve 131. After the reading of the return gas pressure gauge 132 stabilizes, close the main valve 112 and the auxiliary valve 113.

[0053] After the readings of the gas sampling pressure gauge 122 and the return pressure gauge 132 stabilize again, open an appropriate number of sample valves 25 as needed (one or more of the four sample valves 25 can be opened as needed). Then, according to the sampling requirements, connect the collection bottle 353 through the three-way valve 32. The raw material gas / sample gas flows into the collection bottle 353 for storage to achieve sampling and collection.

[0054] After sampling is completed, the sample collection and processing mechanism 3 is depressurized by the sample gas pressure reducing valve 371 and the separation gas pressure reducing valve 372. Then, the three-way valve 32 and the sample valve 25 are closed in sequence, the main valve 112 and the auxiliary valve 113 are opened, and the gas intake valve 121 and the gas return valve 131 are closed.

[0055] Finally, open the sample valve 25 and the pressure relief valve 26 to complete the pressure relief of the raw material gas sampling mechanism 2. According to the readings of the gas sampling pressure gauge 122, the return gas pressure gauge 132, the sample gas pressure gauge 331, and the separation gas pressure gauge 332, the pressure relief is completed when the pressure is the same as the atmospheric pressure.

[0056] Disassemble the raw gas sampling mechanism 2 connected to pipe flange 123 and pipe flange 233 to complete all sampling work.

[0057] In summary, this invention provides an online sampling and separation device for gas field feedstock gas, comprising a feedstock gas gathering and transportation mechanism 1, a feedstock gas sampling mechanism 2, and a sample collection and processing mechanism 3. The feedstock gas gathering and transportation mechanism 1 includes a main pipeline 11, which is connected to a gas intake pipeline 12 and a gas return pipeline 13. The feedstock gas sampling mechanism 2 includes a sampling pipeline 21, the inlet of which is connected to the outlet of the gas intake pipeline 12. Inside the sampling pipeline 21, a flow disruptor 22 and a sampling inner tube 23 are sequentially arranged along the flow direction. A sample flow chamber 24 is formed between the sample inner tube 23 and the sampling pipe 21. The sample flow chamber 24 is connected to the sample pipe 27. The outlet of the sampling inner tube 23 is connected to the inlet of the return gas pipe 13. The sample collection and processing mechanism 3 includes a sample gas line 31 connected to the sample pipe 27. The sample gas line 31 is connected to a three-way valve 32. The three-way valve 32 is connected to a collection bottle 353 and a separator 363. The separator 363 is connected to a filter 364. The filter 364 is connected to a vent pipe 367. A main valve 112 is installed on the main pipe 11 between the gas intake pipe 12 and the return gas pipe 13. A gas intake valve 121 is installed on the gas intake pipe 12, and a return gas valve 131 is installed on the return gas pipe 13. A gas intake pressure gauge 122 is installed downstream of the gas intake valve 121 on the gas intake pipe 12, and a return gas pressure gauge 132 is installed upstream of the return gas valve 131 on the return gas pipe 13. The pipeline connecting separator 363 and three-way valve 32 is sequentially equipped with a separation gas pressure gauge 332, a separation gas temperature gauge 342, and a separation gas pressure reducing valve 372. The pipeline connecting collection bottle 353 and three-way valve 32 is sequentially equipped with a sample gas pressure reducing valve 371, a sample gas pressure gauge 331, and a sample gas temperature gauge 341. A visualization tube 362 is installed between separator 363 and three-way valve 32, and a sampling valve 361 is installed at the inlet of visualization tube 362. An inlet valve 351 and an outlet valve 352 are installed at the inlet and outlet of collection bottle 353, respectively. A flow meter 365 and a pressure reducing valve 366 are installed in venting pipeline 367. Multiple sample pipelines 27 are merged into one sample pipeline 27, which is connected to the sample gas pipeline 31, and the merged sample pipeline 27 is equipped with a pressure relief valve 26. The non-merged sample pipeline 27 is equipped with a sample valve 25.

[0058] This invention also provides an online sampling and separation method for gas field feedstock gas, which includes an online sampling and separation device for gas field feedstock gas and the following method: First, confirm that all valves of the feedstock gas sampling mechanism 2 and the sample collection and processing mechanism 3 are in the closed state. Next, open the gas intake valve 121, observe the gas intake pressure gauge 122, and after the reading stabilizes, open the return gas valve 131. After the reading of the return gas pressure gauge 132 stabilizes, close the main valve 112. Open an appropriate number of sample valves 25 according to the sampling needs, and control the three-way valve 32 to connect to the collection bottle 353. The feedstock gas flows into the collection bottle 353 to achieve sampling and collection. Next, after the sampling and collection is completed, the sample collection and processing mechanism 3 is depressurized through the sample gas depressurization valve 371 and the separation gas depressurization valve 372. Then, the three-way valve 32 and the sample valves 25 are closed in sequence, the main valve 112 is opened, and the gas intake valve 121 and the return gas valve 131 are closed. Finally, the sample valves 25 and the depressurization valve 26 are opened to allow the feedstock gas sampling mechanism 2 to depressurize to the same as atmospheric pressure.

[0059] Therefore, the online sampling and separation device and method for gas field feedstock gas of the present invention has the advantages of good sample representativeness and online sampling.

[0060] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online sampling and separation device for raw gas from a gas field, characterized in that, It includes a raw gas gathering and transportation mechanism (1), a raw gas sampling mechanism (2), and a sample collection and processing mechanism (3). The raw gas gathering and transportation mechanism (1) includes a main pipeline (11), which is connected to a gas intake pipeline (12) and a gas return pipeline (13). The raw gas sampling mechanism (2) includes a sampling pipe (21), the inlet of which is connected to the outlet of the gas sampling pipe (12). Inside the sampling pipe (21), a flow disruptor (22) and a sampling inner tube (23) are sequentially arranged along the flow direction. A sample flow chamber (24) is formed between the sampling inner tube (23) and the sampling pipe (21). The sample flow chamber (24) is connected to a sample pipe (27). The outlet of the sampling inner tube (23) is connected to the inlet of the return gas pipe (13). The sample collection and processing mechanism (3) includes a sample gas pipeline (31) connected to the sample pipeline (27), the sample gas pipeline (31) is connected to a three-way valve (32), the three-way valve (32) is connected to a collection bottle (353) and a separator (363), the separator (363) is connected to a filter (364), and the filter (364) is connected to a venting pipe (367).

2. The online sampling and separation device for gas field feedstock gas according to claim 1, characterized in that, A main valve (112) is provided on the main pipe (11) between the gas intake pipe (12) and the gas return pipe (13), a gas intake valve (121) is provided on the gas intake pipe (12), and a gas return valve (131) is provided on the gas return pipe (13).

3. The online sampling and separation device for gas field feedstock gas according to claim 2, characterized in that, The gas intake pipe (12) is provided with a gas intake pressure gauge (122) on the downstream side of the gas intake valve (121), and the return gas pipe (13) is provided with a return gas pressure gauge (132) on the upstream side of the return gas valve (131).

4. The online sampling and separation device for gas field feedstock gas according to claim 1, characterized in that, The pipeline connecting the separator (363) and the three-way valve (32) is equipped with a separation gas pressure gauge (332), a separation gas temperature gauge (342), and a separation gas pressure reducing valve (372) in sequence. The pipeline connecting the collection bottle (353) and the three-way valve (32) is equipped with a sample gas pressure reducing valve (371), a sample gas pressure gauge (331), and a sample gas temperature gauge (341) in sequence.

5. The online sampling and separation device for gas field feedstock gas according to claim 4, characterized in that, The pipe connecting the separator (363) and the three-way valve (32) is provided with a visualization pipe (362), and a sampling valve (361) is provided at the inlet of the visualization pipe (362).

6. The online sampling and separation device for gas field feedstock gas according to claim 1, characterized in that, The collection bottle (353) is equipped with an inlet valve (351) and an outlet valve (352) at its inlet and outlet, respectively.

7. The online sampling and separation device for gas field feedstock gas according to claim 1, characterized in that, The vent pipe (367) is equipped with a flow meter (365) and a pressure reducing valve (366).

8. The online sampling and separation device for gas field feedstock gas according to claim 1, characterized in that, Multiple sample pipes (27) are combined and connected to one sample pipe (27). The combined sample pipe (27) is connected to the sample gas line (31), and the combined sample pipe (27) is equipped with a pressure relief valve (26).

9. The online sampling and separation device for gas field feedstock gas according to claim 8, characterized in that, The sample pipeline (27) after merging is equipped with a sample valve (25).

10. A method for online sampling and separation of raw gas from a gas field, characterized in that, The online sampling and separation device for gas field feedstock gas as described in claim 1 further includes the following method: Confirm that all valves of the raw material gas sampling mechanism (2) and the sample collection and processing mechanism (3) are in the closed state. Next, open the gas sampling valve (121), observe the gas sampling pressure gauge (122), and after the reading stabilizes, open the return gas valve (131). After the reading of the return gas pressure gauge (132) stabilizes, close the main valve (112). Open an appropriate number of sample valves (25) according to the sampling needs, and control the three-way valve (32) to connect to the collection bottle (353). The raw material gas flows into the collection bottle (353) to achieve sampling and collection. Next, after sampling and collection, the sample collection and processing mechanism (3) is depressurized by using the sample gas pressure reducing valve (371) and the separation gas pressure reducing valve (372). Then, the three-way valve (32) and the sample valve (25) are closed in sequence, the main valve (112) is opened, and the gas intake valve (121) and the gas return valve (131) are closed. Finally, open the sample valve (25) and the pressure relief valve (26) to allow the raw material gas sampling mechanism (2) to release pressure to the same level as atmospheric pressure.

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