A natural gas wellhead tracer sampling device

Abstract

This utility model discloses a natural gas wellhead tracer sampling device, including a production tree installed at the natural gas wellhead. A first pressure gauge connector and a second pressure gauge connector are installed on the production tree. The first and second pressure gauge connectors are respectively equipped with an inlet tee and an outlet tee. A first check valve and a second check valve are respectively installed at the bottom of the inlet and outlet tee. A first valve and a second valve are respectively installed on the middle side sections of the inlet and outlet tee. This utility model utilizes the large pressure difference between the two ends of the wellhead gas generated by the wellhead needle valve for sampling, greatly improving sampling efficiency and enabling the rapid acquisition of representative gas samples. Furthermore, traditional sampling devices require modification of the original wellhead production process, while this device can be installed, used, and disassembled without altering the existing general natural gas wellhead process, solving the problem of poor field applicability of traditional devices.

Description

Technical Field

[0001] This utility model relates to the field of natural gas extraction technology, and in particular to a natural gas wellhead tracer sampling device. Background Technology

[0002] In the process of natural gas extraction, sampling and analyzing the gas produced at the wellhead is an important means to understand the gas composition, monitor the production status, and conduct related research. One method is to use nanosphere tracers for post-pressure profiling tests, and the samples taken are bottled liquid and gas samples.

[0003] For example, utility model application No. 202223167471.0 discloses a novel long-acting tracer sampling device, including a main pipeline, a separator fixedly connected to the top of the main pipeline, an air inlet valve and a pressure gauge fixedly installed in sequence on the connecting pipeline between the main pipeline and the separator, and a sampler fixedly connected to the top of the separator.

[0004] However, the existing natural gas wellhead sampling devices have some shortcomings. Both ends of the sampling device are directly connected to the pipelines of the natural gas production tree, resulting in a small pressure difference between the two ends of the sampling device, leading to very low sampling efficiency and failing to meet the needs of efficient production and analysis. Furthermore, the installation of existing sampling devices requires modification of the original wellhead production process, increasing the complexity of the on-site gas production process and introducing many engineering instabilities. Utility Model Content

[0005] This invention provides a natural gas wellhead tracer sampling device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A natural gas wellhead tracer sampling device includes a gas production tree installed at the head of a natural gas production well. A first pressure gauge connector and a second pressure gauge connector are installed on the gas production tree. An inlet tee and an exhaust tee are respectively provided on the first pressure gauge connector and the second pressure gauge connector. A first check valve and a second check valve are respectively provided at the bottom end of the inlet tee and the exhaust tee. A first valve and a second valve are respectively provided on the middle side section of the inlet tee and the exhaust tee.

[0008] A first high-pressure hose is fixedly connected to the end of the intake tee pipe near the first valve. A pressure reducing valve and a flow meter are sequentially installed on the first high-pressure hose. A gas-liquid separator is connected to one end of the first high-pressure hose. A second high-pressure hose is fixedly connected to the upper end of the gas-liquid separator. A gas diaphragm sampling flange is installed on the second high-pressure hose. A four-way pipe is fixedly connected to one end of the second high-pressure hose. A drain tee pipe is fixedly connected to the bottom end of the gas-liquid separator. A fourth valve and a third valve are respectively installed at the bottom and middle side of the drain tee pipe. A third high-pressure hose is fixedly connected to the bottom end of the drain tee pipe. One end of the third high-pressure hose is fixedly connected to the bottom end of the four-way pipe. A pressure relief valve is installed at the upper end of the four-way pipe. A fourth high-pressure hose is fixedly connected to the right end of the pressure relief valve. One end of the fourth high-pressure hose is fixedly connected to the end of the exhaust tee pipe near the second valve.

[0009] Preferably, the gas-liquid separator is a cyclone separator. The mixed-phase fluid enters from the first high-pressure hose, passes through the filter of the gas-liquid separator, the gas flows out from the upper second high-pressure hose, and the liquid can flow out from the lower drain tee.

[0010] Preferably, the top ends of the intake tee and the exhaust tee are respectively equipped with a first gas pressure gauge and a second gas pressure gauge.

[0011] Preferably, the gas membrane sampling flange contains filter paper with nanoscale pores to capture nanospheres with tracer tags.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The device is reasonably designed and uses the large pressure difference generated at both ends after the wellhead gas passes through the wellhead needle valve for sampling. Compared with the existing devices, which have small pressure difference and low sampling efficiency, this device greatly improves the sampling efficiency and can quickly obtain representative gas samples.

[0014] 2. The device is easy to connect and highly versatile, requiring no changes to the existing production process, thus reducing instability factors in the project.

[0015] 3. The device is equipped with a pressure relief valve, which can promptly release the pressure inside the device after sampling, ensuring the safety of operators. Simultaneously, the sight glass allows operators to visually observe the gas flow rate, facilitating timely adjustments and operations.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a three-dimensional structural diagram of a natural gas wellhead tracer sampling device proposed in this utility model;

[0019] Figure 2 This is a front view structural diagram of a natural gas wellhead tracer sampling device proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the original gas extraction tree structure.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. First pressure gauge connector; 2. Pressure reducing valve; 3. Sight glass; 4. Third valve; 5. Drain tee; 6. Fourth valve; 7. Third high-pressure hose; 8. Gas diaphragm sampling flange; 9. Second valve; 10. Second pressure gauge connector; 11. Second check valve; 12. Exhaust tee; 13. Second gas pressure gauge; 14. Fourth high-pressure hose; 15. Four-way pipe; 16. Pressure relief valve; 17. Second high-pressure hose; 18. Gas-water separator; 19. First high-pressure hose; 20. First gas pressure gauge; 21. First valve; 22. Inlet tee; 23. First check valve; 24. Wellhead needle valve. Detailed Implementation

[0023] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described in more detail below by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please see Figures 1-2In this embodiment of the present invention, a natural gas wellhead tracer sampling device includes a gas production tree installed at the natural gas wellhead. The gas production tree is used to control the extraction and transportation of natural gas. A first pressure gauge connector 1 and a second pressure gauge connector 10 are installed on the gas production tree. The first pressure gauge connector 1 and the second pressure gauge connector 10 are respectively provided with an inlet tee pipe 22 and an exhaust tee pipe 12. The bottom ends of the inlet tee pipe 22 and the exhaust tee pipe 12 are respectively provided with a first one-way valve 23 and a second one-way valve 11. The first one-way valve 23 at the bottom end of the inlet tee pipe 22 ensures that gas can only enter the sampling device from the gas production tree and prevent gas backflow. The second one-way valve 11 at the bottom end of the exhaust tee pipe 12 ensures that gas can only be discharged from the sampling device to the gas production tree and avoids external gas from entering and interfering with the sampling.

[0026] The middle sections of the intake tee pipe 22 and the exhaust tee pipe 12 are respectively provided with a first valve 21 and a second valve 9, which are used to control the direction and flow rate of the gas.

[0027] A first high-pressure hose 19 is fixedly connected to one end of the inlet tee pipe 22 near the first valve 21. A pressure reducing valve 2 and a sight glass 3 are sequentially installed on the first high-pressure hose 19. The sight glass 3 can be a glass tube sight glass 20-YQ-SL-10. The operator can visually observe the gas flow through the sight glass 3 to determine whether the gas flow is stable, so as to adjust the opening of the relevant valves in time. One end of the first high-pressure hose 19 is connected to a gas-water separator 18. The upper end of the gas-water separator 18 is fixedly connected to a second high-pressure hose 17. A gas diaphragm sampling flange 8 is installed on the second high-pressure hose 17. The gas diaphragm sampling flange 8 contains filter paper with nano-level pores to capture nanospheres with tracer tags. The gas diaphragm sampling flange 8 is a German LABOM DD4200 diaphragm flange or a diaphragm-sealed pressure transmitter EJA438N (3-inch flange) or similar products. The flange is generally composed of two flanges connected by bolts and filter paper between the two flanges.

[0028] One end of the second high-pressure hose 17 is fixedly connected to a four-way pipe 15. The bottom end of the gas-water separator 18 is fixedly connected to a drain tee pipe 5. The bottom end and the middle side end of the drain tee pipe 5 are respectively provided with a fourth valve 6 and a third valve 4. The bottom end of the drain tee pipe 5 is fixedly connected to a third high-pressure hose 7. One end of the third high-pressure hose 7 is fixedly connected to the bottom end of the four-way pipe 15. The upper end of the four-way pipe 15 is provided with a pressure relief valve 16. The right end of the pressure relief valve 16 is fixedly connected to a fourth high-pressure hose 14. One end of the fourth high-pressure hose 14 is fixedly connected to the end of the exhaust tee pipe 12 near the second valve 9.

[0029] The gas-water separator 18 is a cyclone separator (cyclone separators are existing technology, and their specific structure will not be described in detail here). The mixed fluid contains gas and possible liquid, such as water. After entering the gas-water separator from the first high-pressure hose 19, the gas and liquid are separated under the action of cyclone separation. Since the gas has a lower density, the separated gas flows out from the second high-pressure hose 17 above the gas-water separator 18; while the water can flow out from the drain tee pipe 5 below the gas-water separator 18.

[0030] The top ends of the inlet tee pipe 22 and the exhaust tee pipe 12 are respectively equipped with a first gas pressure gauge 20 and a second gas pressure gauge 13. The first gas pressure gauge 20 and the second gas pressure gauge 13 were originally directly installed on the first pressure gauge connector 1 and the second pressure gauge connector 10 to measure the gas pressure in the gas sampling tree. The bottom interfaces of the inlet tee pipe 22 and the exhaust tee pipe 12 of this device are the same as the bottom interfaces of the first gas pressure gauge 20 and the second gas pressure gauge 13.

[0031] The existing gas-producing trees, such as Figure 3 As shown, the gas sampling tree is equipped with a first pressure gauge connector 1 and a second pressure gauge connector 10. The first pressure gauge connector 1 and the second pressure gauge connector 10 are respectively equipped with a first gas pressure gauge 20 and a second gas pressure gauge 13. When installing this sampling device, it is only necessary to install the bottom ends of the inlet tee pipe 22 and the exhaust tee pipe 12 on the upper ends of the first pressure gauge connector 1 and the second pressure gauge connector 10, respectively, and then install the first gas pressure gauge 20 and the second gas pressure gauge 13 on the upper ends of the inlet tee pipe 22 and the exhaust tee pipe 12, respectively. Therefore, no modification to the gas sampling tree is required, which reduces installation time and cost, and also reduces the safety risks caused by modification.

[0032] The working principle of this utility model is as follows:

[0033] Under normal conditions, the first valve 21, the second valve 9, and the fourth valve 6 are opened, while the third valve 4 and the pressure relief valve 16 are closed. The natural gas in the gas sampling tree first enters the inlet tee pipe 22 through the first pressure gauge connector 1. The gas in the gas sampling tree then enters the first high-pressure hose 19 through the inlet tee pipe 22. The gas first passes through the pressure reducing valve 2 and the flow meter 3. The pressure reducing valve 2 reduces the pressure of the gas to ensure that the sampling pressure difference in the device can meet the requirements for safe and efficient sampling operations. The first gas pressure gauge 20 and the second gas pressure gauge 13 are used to measure the gas pressure at the inlet and outlet ends, respectively. The pressure difference between the two is used to make the gas flow more efficiently in the device, improving the sampling efficiency. Then, the gas after pressure reduction enters the gas-liquid separator 18, where the gas and liquid are separated. The gas flows out from the second high-pressure hose 17, and the water flows out from the drain tee pipe 5.

[0034] When the gas flowing out from above the gas-liquid separator 18 enters the second high-pressure hose 17, it will enter the gas membrane sampling flange 8 where filter paper is placed inside. When the nanospheres with tracer tags pass through the gas membrane sampling flange 8 with the gas, the nanospheres will be captured by the filter paper because the pores of the filter paper are at the nanoscale, thereby realizing the sampling of the tracer. The liquid flowing into the drain tee pipe 5 can flow into the four-way pipe 15 through the third high-pressure hose 7. After the four-way pipe 15 integrates the gas and liquid flow paths, the mixed-phase fluid is discharged into the gas sampling tree through the fourth high-pressure hose 14, the exhaust tee pipe 12, and the second pressure gauge connector 10.

[0035] When sampling is required, first close the fourth valve 6 to allow liquid to be stored in the drain tee 5, then close the first valve 21 and the second valve 9, and open the pressure relief valve 16. Opening the pressure relief valve 16 can release the air pressure in each pipe to ensure safe operation. Then, open the third valve 4 to obtain the moisture sample in the four-way pipe 15, and then open the gas membrane sampling flange 8 to remove the filter paper containing the tracer.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A natural gas wellhead tracer sampling device comprising a Christmas tree installed at the wellhead of a natural gas production well, said Christmas tree having a first pressure gauge connection (1) and a second pressure gauge connection (10) installed thereon, characterized in that, The first pressure gauge connector (1) and the second pressure gauge connector (10) are respectively provided with an inlet tee pipe (22) and an exhaust tee pipe (12). The bottom ends of the inlet tee pipe (22) and the exhaust tee pipe (12) are respectively provided with a first check valve (23) and a second check valve (11). The middle side sections of the inlet tee pipe (22) and the exhaust tee pipe (12) are respectively provided with a first valve (21) and a second valve (9). A first high-pressure hose (19) is fixedly connected to one end of the air intake three-way pipe (22) near the first valve (21). A pressure reducing valve (2) and a flow meter (3) are sequentially provided on the first high-pressure hose (19). A gas-liquid separator (18) is connected to one end of the first high-pressure hose (19). A second high-pressure hose (17) is fixedly connected to the upper end of the gas-liquid separator (18). A gas diaphragm sampling flange (8) is provided on the second high-pressure hose (17). A four-way pipe (15) is fixedly connected to one end of the second high-pressure hose (17). The bottom end of the gas-liquid separator (18) is fixedly connected to the first high-pressure hose (22). A drain tee pipe (5) is connected. The bottom end and the middle side end of the drain tee pipe (5) are respectively provided with a fourth valve (6) and a third valve (4). The bottom end of the drain tee pipe (5) is fixedly connected with a third high-pressure hose (7). One end of the third high-pressure hose (7) is fixedly connected to the bottom end of the four-way pipe (15). The upper end of the four-way pipe (15) is provided with a pressure relief valve (16). The right end of the pressure relief valve (16) is fixedly connected with a fourth high-pressure hose (14). One end of the fourth high-pressure hose (14) is fixedly connected to the end of the exhaust tee pipe (12) near the second valve (9).

2. The natural gas wellhead tracer sampling device according to claim 1, characterized in that, The gas-water separator (18) is a cyclone separator. The mixed-phase fluid enters from the first high-pressure hose (19), passes through the gas-water separator (18) for filtration, and the gas flows out from the upper second high-pressure hose (17). The liquid can flow out from the lower drain tee (5).

3. The natural gas wellhead tracer sampling device according to claim 1, characterized in that, The top ends of the intake tee (22) and the exhaust tee (12) are respectively equipped with a first gas pressure gauge (20) and a second gas pressure gauge (13).

4. A natural gas wellhead tracer sampling device according to claim 1, characterized in that, The gas membrane sampling flange (8) contains filter paper with nanoscale pores, which captures nanospheres with tracer tags.

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