A gas tracer sampling device for fracturing monitoring

Abstract

This invention belongs to the field of petroleum engineering gas sampling technology, specifically relating to a gas tracer sampling device for fracturing monitoring. The gas tracer sampling device for fracturing monitoring includes, in sequence from upstream to downstream, an interface shut-off valve, a pressure reducing assembly, a pressure safety mechanism, a gas detection mechanism, a drying mechanism, a sampling solenoid valve, and a gas collection bottle. This invention enables automatic gas sampling and gas detection.

Description

Technical Field

[0001] This invention belongs to the field of petroleum engineering gas sampling technology, specifically, it relates to a gas tracer sampling device for fracturing monitoring. Background Technology

[0002] Currently, coiled tubing delivery array testing instruments and distributed fiber optic temperature and pressure testing are the main technical means for horizontal well profiling. The application of coiled tubing delivery array testing instruments in deep wells, sand-producing wells, small-diameter wells, wells with complex structures, and high-temperature, high-pressure oil and gas wells is limited. Fiber optic temperature and pressure testing is characterized by long-term monitoring, high cost, difficult construction, and challenging data interpretation; therefore, the technology needs further improvement.

[0003] Slow-release tracer production profile testing technology utilizes tracers with different identification numbers placed in different production zones downhole. During production, the tracers dissolve in the produced fluids from different zones and are returned to the wellhead, where samples are then taken and analyzed in the laboratory. By analyzing the different physical properties and concentrations of the tracers, the fluid properties and production rates of different zones can be determined. This technology is characterized by wide applicability, low cost, and long-term monitoring of horizontal well production profiles, offering significant advantages in both technology and cost.

[0004] Based on the different phase states of the fluid monitored by the tracer, tracers can be divided into three categories: oil-soluble tracers, water-soluble tracers, and gas-soluble tracers. Among them, gas-soluble tracers monitor the methane gas produced in different fractured sections in horizontal wells. The gas production contribution of the corresponding fractured section can be quantitatively characterized by the concentration of different types of gas-soluble tracers.

[0005] Based on current field applications of tracers, this technology still has the following shortcomings in practical implementation: First, the quality of field sampling is greatly affected by human factors, and omissions or errors in sampling occur frequently; second, manual field sampling cannot meet the needs of long-term monitoring; third, the sampling situation lacks a real-time remote control system, and problems cannot be promptly reported to relevant personnel. To address the shortcomings of the existing technology and ensure the quality of tracer sampling, an automatic sampling device that can replace manual sampling, enable long-term monitoring, and achieve remote control is proposed.

[0006] Chinese patent document CN212159241U discloses a VOCs oil and gas collection device, relating to the technical field of VOCs treatment devices. The VOCs oil and gas collection device includes a cavity, with a water tank fixed to its side, containing sealed water. A liquid regulating port is provided on the side wall at the connection between the cavity and the water tank, penetrating both the side walls of the cavity and the water tank. A pipe penetrates the bottom surface of the cavity. This invention employs a water seal, combined with a water flow regulating device, to ensure that excessive VOCs release is not caused by excessively low water levels, while also acting as a flame arrestor. A baffle prevents gas from the pressure relief pipe from escaping through the water flow regulating device. This avoids oil loss and prevents excessive negative pressure within the oil tank, which could lead to container instability, deformation, and accidents.

[0007] Chinese patent document CN212059572U relates to the field of oil and gas sampling equipment, disclosing a pressure-sensitive oil and gas sampling device. The pressure-sensitive oil and gas sampling device includes an airflow sensing mechanism for sensing the airflow in an oil and gas pipe. This airflow sensing mechanism is connected to a detection mechanism. Airflow drives an impeller to rotate, ultimately rotating a code disk in the detection mechanism. The mechanical rotation of the code disk causes changes in the light signal illuminating a photoelectric sensor, thereby generating different current signals. A microcontroller determines the airflow information based on the current, realizing the detection of oil and gas flow in the oil and gas pipe. When oil and gas flow is detected, the microcontroller controls the gas sampling mechanism to automatically collect gas, replacing manual sampling, which is convenient, practical, and saves manpower. During sampling, the microcontroller ensures stable flow of oil and gas exhaust gas in the pipe, guaranteeing sampling accuracy. During sampling, air in the connector and the gas sampling mechanism is pre-expelled under the control of the microcontroller, preventing air inside the instrument from affecting the sample accuracy.

[0008] Chinese patent document CN216771209U relates to the field of natural gas, specifically to natural gas sample collection technology. This invention aims to meet the need for automatic natural gas sample collection in the accurate measurement of natural gas energy and reliable measurement of natural gas calorific value. It provides an automatic natural gas sample collection device, including an accumulating gas sample collection device, a gas path control unit, an MCU control unit, and a gas sample storage unit. The natural gas sample collection branch pipeline is connected to the inlet of the chromatographic analysis unit through the first outlet of the accumulating gas sample collection device. The gas path control unit controls the accumulating gas sample collection device to collect gas samples. The signal input or output terminal of the gas path control unit is connected to the signal output or input terminal of the MCU control unit. The signal input or output terminal of the chromatographic analysis unit of the MCU control unit is connected to the signal output or input terminal of the chromatographic analysis unit. This invention is applicable to the automatic collection of natural gas samples in the accurate measurement of natural gas energy and reliable measurement of natural gas calorific value. Summary of the Invention

[0009] To address the technical problems described above, the present invention aims to provide a gas tracer sampling device for fracturing monitoring, which can realize automatic gas sampling and gas detection.

[0010] According to the present invention, a gas tracer sampling device for fracturing monitoring is provided, comprising an interface shut-off valve, a pressure reducing assembly, a pressure safety mechanism, a gas detection mechanism, a drying mechanism, a sampling solenoid valve, and a gas collection bottle connected sequentially from upstream to downstream.

[0011] In a preferred embodiment, the gas detection mechanism includes a housing, a vent pipe on the housing, and a colorimetric reagent inside the housing. After the gas enters the housing through the vent pipe, the colorimetric reagent comes into contact with the gas, thereby detecting the gas.

[0012] In a preferred embodiment, a gas colorimetric reaction chamber is provided inside the outer shell, the vent pipe is connected to the gas colorimetric reaction chamber, and a carrier strip carrying the colorimetric agent is movably and sealed through the gas colorimetric reaction chamber, with at least a portion of the carrier strip located inside the gas colorimetric reaction chamber and the remaining portion of the carrier strip located outside the gas colorimetric reaction chamber.

[0013] In a preferred embodiment, a color developer liquid tank is provided inside the housing, and at least a portion of the carrier strip is located within the color developer liquid tank.

[0014] In a preferred embodiment, a winding wheel is rotatably arranged inside the outer shell, and one end of the carrier strip in the color developer liquid tank passes through the gas color development reaction chamber and is wound around the winding wheel.

[0015] In a preferred embodiment, at least one fulcrum is provided inside the housing to guide the carrier strip.

[0016] In a preferred embodiment, the carrier strip is arranged in a spiral coiled manner within the color developer liquid tank.

[0017] In a preferred embodiment, the pressure reducing assembly includes a first pressure reducing valve and a second pressure reducing valve connected in series.

[0018] In a preferred embodiment, the pressure safety mechanism is configured as an explosion-proof ball valve.

[0019] In a preferred embodiment, a plurality of the sampling solenoid valves are arranged in parallel downstream of the drying mechanism, and a gas collection bottle is respectively arranged downstream of each sampling solenoid valve.

[0020] Compared with the prior art, the advantages of this application are as follows.

[0021] This invention improves sampling efficiency through electromagnetic sampling and avoids errors associated with manual sampling. The invention includes a gas detection mechanism and a drying mechanism to ensure the quality of the gas samples. Attached Figure Description

[0022] The invention will now be described with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of an embodiment of a gas tracer sampling device for fracturing monitoring provided by the present invention.

[0024] Figure 2 This is a schematic diagram of the appearance of an embodiment of the gas detection mechanism provided by the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of a gas detection mechanism according to an embodiment of the present invention.

[0026] In the diagram: 1. Interface shut-off valve; 30. Pressure reducing assembly; 2. First pressure reducing valve; 3. Second pressure reducing valve; 4. Pressure safety mechanism; 5. Gas detection mechanism; 6. Drying mechanism; 7. Pressure sensor; 8. Sampling solenoid valve; 9. Exhaust gas discharge pipeline; 10. Gas collection bottle; 11. Viewing window; 12. Outer shell; 13. Vent pipe; 14. Winding wheel; 15. Fusel point; 16. Colorimetric reagent tank; 17. Carrier strip; 18. Gas colorimetric reaction chamber; 19. Inlet / outlet slot; 20. Colorimetric reagent; 100. Gas tracer sampling device for fracturing monitoring.

[0027] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0028] The invention will now be described with reference to the accompanying drawings.

[0029] It should be noted that in this application, the direction of gas flow is described as "upstream", "front end" or similar terms, while the destination of gas flow is described as "downstream", "back end" or similar terms.

[0030] Figure 1 The structure of a gas tracer sampling device 100 for fracturing monitoring according to the present invention is shown. Figure 1 As shown, the gas tracer sampling device 100 for fracturing monitoring includes an interface shut-off valve 1, a pressure reducing assembly 30, a pressure safety mechanism 4, a gas detection mechanism 5, a drying mechanism 6, a sampling solenoid valve 8, and a gas collection bottle 10, which are connected sequentially from upstream to downstream.

[0031] In a preferred embodiment, a pressure sensor 7 is connected in series between the drying mechanism 6 and the sampling solenoid valve 8.

[0032] In existing technologies, the process of collecting tracer gas samples at oilfield sites involves manually holding a collection tube to the separator or blowout preventer line to collect the gas (natural gas). According to the present invention, the upstream valve interface of the interface shut-off valve 1 is connected to the valve interface of the field separator or blowout preventer line. The gas flows out from the separator or blowout preventer line, sequentially passing through the interface shut-off valve 1, pressure reducing assembly 30, pressure safety mechanism 4, gas detection mechanism 5, and drying mechanism 6. Finally, under the on / off control of the sampling solenoid valve 8, the gas is collected according to a pre-set sampling time.

[0033] In this embodiment, the interface shut-off valve 1 has an M20*1.5 external thread and is made of 304 or 316 stainless steel. A filter screen is built into the interface of the interface shut-off valve 1 to prevent sand from causing blockage of the device. The interface shut-off valve 1 is always open during use. The interface shut-off valve 1 is the main switch of the entire fracturing monitoring gas tracer sampling device 100.

[0034] In this embodiment, the pressure reducing assembly 30 includes a first pressure reducing valve 2 and a second pressure reducing valve 3 connected in series. Both the first pressure reducing valve 2 and the second pressure reducing valve 3 are pressure reducing valves with built-in pressure gauges, and are made of 304 or 316 stainless steel.

[0035] The front end of the first pressure reducing valve 2 is connected to the outlet end of the interface shut-off valve 1 via a pipeline. The first pressure reducing valve 2 is a single-stage pressure reducing valve, which can reduce the gas pressure from 40MPa to 4MPa.

[0036] The front end of the second pressure reducing valve 3 is connected to the outlet end of the first pressure reducing valve 2 via a pipeline. The second pressure reducing valve 3 is a two-stage pressure reducing valve, which can further reduce the gas pressure, reducing the gas pressure from 4MPa to 1MPa.

[0037] The gas pressure after passing through the interface shut-off valve 1 is usually around 30MPa. This invention effectively reduces the gas collection pressure by connecting the first pressure reducing valve 2 and the second pressure reducing valve 3 in series, thus ensuring the safety of the collection personnel.

[0038] The pressure safety mechanism 4 is configured as an explosion-proof ball valve. The front end of the explosion-proof ball valve is connected to the outlet end of the second pressure reducing valve 3 via a pipeline. As a pressure safety device for the entire data acquisition unit, the pressure safety mechanism 4 is designed to protect the integrity and safety of downstream systems in the event of a malfunction in the pressure reducing component 30. In this embodiment, the safety pressure of the explosion-proof ball valve as the pressure safety mechanism 4 is 10 MPa. That is, when the gas pressure exceeds 10 MPa, the explosion-proof ball valve automatically closes the gas passage, thereby effectively protecting the downstream structures.

[0039] According to the present invention, such as Figure 2 and Figure 3 As shown, the gas detection mechanism 5 includes a housing 12, a vent pipe 13 is provided on the housing 12, and a color developer is provided inside the housing 12. After the gas enters the housing 12 through the vent pipe 13, the color developer comes into contact with the gas, thereby detecting the gas.

[0040] In this embodiment, the outer casing 12 is configured as a closed square shell, and two vent pipes 13 are respectively connected to the front and rear sides of the outer casing 12. Only the vent pipes 13 can communicate the gas inside and outside the outer casing 12. The vent pipe 13 on the front side of the outer casing 12 is connected to the outlet end of the pressure safety mechanism 4 through a pipeline, and the vent pipe 13 on the rear side of the outer casing 12 is connected to the drying mechanism 6 through a pipeline.

[0041] The type of colorimetric reagent inside the gas detection unit 5 can be changed according to testing requirements. In this embodiment, the gas detection unit 5 is used to detect the hydrogen sulfide content in natural gas, therefore the colorimetric reagent placed inside the outer casing 12 is a hydrogen sulfide colorimetric reagent.

[0042] There are several options for hydrogen sulfide colorimetric reagents, such as the methylene blue method (most commonly used in colorimetric methods), the lead method, mercury method, and copper method (commonly used in detection tube methods), and sodium ferricyanide nitrite, which, under alkaline conditions, reacts with sulfur in hydrogen sulfide. 2- It can react with Na2Fe(CN)5NO to form reddish-purple Na4Fe(CN)5NOS, which shows obvious color development, appearing as quickly as within 5 minutes, with high resolution and strong anti-interference ability. Considering that the gas detection unit 5 is for on-site detection, it is required to react rapidly with the gas being tested, show immediate color development, and have a significant color change. Therefore, the preferred color reagent in the gas detection unit 5 is a 3% sodium nitrosoferricyanide solution, with the solution alkalinity controlled at around pH 12. The color reagent can produce a color reaction within 5 minutes.

[0043] In a preferred embodiment, a gas colorimetric reaction chamber 18 is disposed within the outer casing 12. The gas colorimetric reaction chamber 18 is a closed space relative to the outer casing 12. In this embodiment, the vent pipe 13 is connected to the gas colorimetric reaction chamber 18, meaning that the vent pipe 13 cannot deliver gas to the space between the gas colorimetric reaction chamber 18 and the outer casing 12, but can only deliver gas to the interior of the gas colorimetric reaction chamber 18. A carrier strip 17 carrying the colorimetric reagent is movably and sealed through the gas colorimetric reaction chamber 18. At least a portion of the carrier strip 17 is located inside the gas colorimetric reaction chamber 18, and the remaining portion is located outside the gas colorimetric reaction chamber 18. With this arrangement, when the carrier strip 17 located inside the gas colorimetric reaction chamber 18 undergoes a color change reaction, the carrier strip 17 can be pulled to move relative to the gas colorimetric reaction chamber 18, thereby completing the rapid replacement of the colorimetric reagent and saving operation time.

[0044] In a preferred embodiment, the carrier strip 17 is made of white sponge material and is in the shape of a long strip.

[0045] In a preferred embodiment, the gas colorimetric reaction chamber 18 is shaped like a triangular cylinder, with one side of the cylinder contacting the top surface of the outer shell 12, forming an inverted triangle. The contact surface between the gas colorimetric reaction chamber 18 and the outer shell 12 is configured as a viewing window 11, which is made of a transparent material, such as glass, for easy observation.

[0046] In this embodiment, the outer shell 12 is a stainless steel cuboid shell with an opening in the middle of the top. The viewing window 11 is located at the top opening of the outer shell 12, sealing the top of the outer shell 12. The viewing window 11 is the top surface of the gas colorimetric reaction chamber 18. Inside the outer shell 12, two other stainless steel surfaces are provided in the triangular cylindrical shape of the gas colorimetric reaction chamber 18.

[0047] On the other two triangular sides of the gas colorimetric reaction chamber 18, there are inlet and outlet slots 19. Rubber seals are provided at the edges of the inlet and outlet slots 19. One end of the carrier strip 17 enters the gas colorimetric reaction chamber 18 through one of the inlet and outlet slots 19 and then exits through the other inlet and outlet slot 19. The seals at the edges of the inlet and outlet slots 19 can play a sealing role, preventing the gas in the gas colorimetric reaction chamber 18 from flowing to the outer shell 12 and the space outside the gas colorimetric reaction chamber 18, thereby preventing the gas from contaminating the colorimetric agent on the carrier strip that has not entered the gas colorimetric reaction chamber 18.

[0048] In one specific embodiment, the width of the carrier strip 17 is set to 1cm, and the shape of the inlet / outlet slot 19 is adapted to the carrier strip 17.

[0049] According to a preferred embodiment of the present invention, a color developer liquid tank 16 is provided inside the outer shell 12, and at least a portion of the carrier strip 17 is located inside the color developer liquid tank 16.

[0050] like Figure 3 As shown, in this embodiment, the top opening of the color developer liquid tank 16 is located inside the outer casing 12 on the right side, to the right of the gas colorimetric reaction chamber 18. The carrier strip 17, exposed on the right side of the gas colorimetric reaction chamber 18, is located inside the color developer liquid tank 16. Color developer 20 is disposed inside the color developer liquid tank 16, capable of wetting the carrier strip 17. With this arrangement, when the carrier strip 17 in the gas colorimetric reaction chamber 18 needs to be replaced after participating in the reaction, pulling the carrier strip 17 from the left side allows the carrier strip 17, now wetting the color developer 20, to enter the gas colorimetric reaction chamber 18.

[0051] In a preferred embodiment, the carrier strip 17 is arranged in a spiral coiled manner within the developer liquid reservoir 16. With this arrangement, when the carrier strip 17 is pulled, the spirally coiled carrier strip 17 within the developer liquid reservoir 16 will inevitably rotate. In this case, even if there is only a very light amount of developer 20 in the developer liquid reservoir 16, the carrier strip 17 about to be removed from the developer liquid reservoir 16 can still be contaminated with developer 20.

[0052] According to a preferred embodiment of the present invention, a winding wheel 14 is rotatably disposed within the outer casing 12, such as... Figure 3 As shown, the winding wheel 14 is located on the left side of the outer casing 12, to the left of the gas colorimetric reaction chamber 18. One end of the carrier strip 17 in the colorimetric reagent liquid chamber 16 passes through the gas colorimetric reaction chamber 18 from right to left and is wound around the winding wheel 14. Furthermore, the rotation axis of the winding wheel 14 extends to the outside of the outer casing 12, so that a drive mechanism can be connected to the outside to rotate the winding wheel 14.

[0053] According to a preferred embodiment of the present invention, at least one fulcrum 15 for guiding the carrier strip 17 is provided within the outer casing 12. For example... Figure 3 As shown, this embodiment has two fulcrums 15. One fulcrum 15 is located between the gas colorimetric reaction chamber 18 and the colorimetric reagent liquid chamber 16, and the other fulcrum 15 is located between the gas colorimetric reaction chamber 18 and the winding wheel 14.

[0054] According to the present invention, the drying mechanism 6 includes a drying tube and a desiccant disposed inside the drying tube.

[0055] Specifically, the desiccant is a molecular sieve or silica gel that adsorbs the liquid phase. The drying tube is made of 304 or 316 stainless steel and has a pressure resistance of 10 MPa. The function of the drying mechanism 6 is to further separate the liquid phase molecules in the gas. This is especially important when the gas-liquid separator is not in use on site, and the interface shut-off valve 1 can only be connected to the instrument valve on the venting pipeline. In this case, the collected fluid is a gas-liquid mixture. Therefore, the drying mechanism 6 of this invention is particularly important, as it can act as a gas-liquid separator, effectively absorbing the liquid and ensuring the purity of the gas sample.

[0056] like Figure 1 As shown, multiple sampling solenoid valves 8 are arranged in parallel downstream of the drying mechanism 6, and a gas collection bottle 10 is arranged downstream of each sampling solenoid valve 8.

[0057] In this embodiment, three sampling solenoid valves 8 are provided. These valves can be opened sequentially at timed intervals via a remote control program. Each sampling solenoid valve 8 has two outlets: one connected to the gas collection bottle 10, and the other connected to the exhaust gas discharge pipeline 9.

[0058] Before each sampling, the residual gas from the previous sampling is emptied through the exhaust gas discharge line 9 to avoid interfering with the gas being sampled this time. After 5 to 10 minutes of emptying, the sampling solenoid valve 8 automatically switches to close the exhaust gas discharge line 9 and simultaneously switches to open the line leading to the gas collection bottle 10.

[0059] Preferably, two one-way valve hoses are installed at the inlet of the gas collection bottle 10. One one-way valve hose is used to receive gas from the sampling solenoid valve 8, and the other one-way valve hose is used to discharge air from the gas collection bottle 10, ensuring that external air cannot enter the gas collection bottle 10, so that the collected gas can fill the interior of the gas collection bottle 10.

[0060] Fracturing monitoring using tracers typically involves a sampling period of 1 to 3 months. Currently, there are no automated sample collection devices for tracer monitoring at fracturing sites. During this long period, on-site gas testing teams generally require manual sampling at regular intervals and in fixed quantities. Due to the complexity of on-site conditions and varying skill levels among sampling personnel, omissions and incorrect sampling often occur, leading to difficulties in ensuring sample quality and affecting the interpretation of results. Therefore, this invention can replace manual sampling, ensuring sample quality, improving collection efficiency, and reducing labor costs. Excessive pressure during gas sample collection can also pose a danger to sampling personnel. This invention fully considers on-site HSE management requirements, reducing the gas pressure at the interface to 1 MPa through two pressure reductions and installing a pressure relief mechanism 4, effectively ensuring the safety of personnel and the on-site environment.

[0061] The method for gas collection using this invention is as follows.

[0062] When the gas tracer enters the sample collection cycle, the collection personnel first connect the interface shut-off valve 1 to the gas-liquid separator or the venting pipeline (depending on the actual on-site operation, with the gas-liquid separator being the preferred choice). The outlet end of the interface shut-off valve 1 is connected to a flexible hose, which is then connected sequentially as shown in the diagram. The pressure reducing component 30 and the pressure safety mechanism 4 are integrated into one unit. Next are the gas detection mechanism 5 and the drying tube, which has been filled with sufficient desiccant. Since there are consumable parts inside the gas detection mechanism 5 and the drying tube, for easy replacement, the entire gas detection mechanism 5 and the drying tube are independent structures with stainless steel pagoda heads connected to flexible hoses on both sides.

[0063] After the collection begins, the color reaction is first checked through the window 11 of the gas detection mechanism 5. If no color reaction is found within 10 minutes of ventilation, it means that there is no hydrogen sulfide in the collected gas, and the subsequent collection process can continue. If a color reaction is found, it means that there is hydrogen sulfide in the collected gas, and the valve must be closed immediately, relevant personnel must be notified for handling, and subsequent collection work must be stopped.

[0064] During the normal collection cycle, the personnel must pay attention to the desiccant status (the color and volume of the desiccant will change as the water absorption increases), and replace the saturated desiccant in a timely manner. Finally, the personnel connect the three gas collection bottles 10 filled with molecular sieves to the one-way valves of the three gas outlets, which are labeled 1, 2, and 3 respectively. Number 1 corresponds to the earliest collection time, number 2 to the intermediate collection time, and number 3 to the latest collection time. A label is attached to the gas collection bottle 10, indicating the collection date and time. At this point, the fracturing monitoring gas tracer sampling device 100 is installed.

[0065] The fracturing monitoring gas tracer sampling device 100 also includes an electrical control unit for controlling the sampling solenoid valve 8. Specifically, connect the power supply of the electrical control unit to the field electrical cabinet, turn on the main switch, then open the separator valve, and slowly open the interface shut-off valve 1. Observe the readings of the pressure reducing component 30 and the pressure sensor 7 to check whether the gas can flow out normally. Check whether the window 11 of the gas detection mechanism 5 shows a color reaction. Once it is confirmed that there is no hydrogen sulfide gas, normal sampling can be performed. Turn on the terminal control system of the electrical control unit, check whether the network connection is normal, and debug the equipment until the signal reception is normal.

[0066] Set the sampling frequency and time on the terminal control system (mobile phone or computer). Generally, the sampling schedule for gas samples during the first 15 days of the sampling cycle is once every 8 hours, with the sampling time set according to actual conditions, such as 8:00, 16:00, and 24:00. During the 16th to 30th days of the cycle, the sampling schedule is once every 12 hours, with the sampling time set according to actual conditions, such as 8:00 and 20:00. After the 30th day of the cycle, the sampling schedule is once every 24 hours, with the sampling time set according to actual conditions, such as 8:00. When the last sampling of the day is completed, the control terminal will receive a reminder message indicating that all sampling for the day is complete. The sampling personnel then remove all samples and connect the new gas sampling bottle 10 to the one-way valve at the outlet. Note that the time marked on the gas sampling bottle 10 corresponds to the marking on the outlet.

[0067] It should be noted that the directional terms or qualifiers used in this application, such as "up," "down," "left," and "right," are all specific to the referenced material. Figure 3 In other words, they are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0068] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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.

[0070] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas tracer sampling device for fracturing monitoring, characterized in that, It includes an interface shut-off valve (1), a pressure reducing assembly (30), a pressure safety mechanism (4), a gas detection mechanism (5), a drying mechanism (6), a sampling solenoid valve (8), and a gas collection bottle (10), which are connected sequentially from upstream to downstream. The gas detection mechanism (5) includes a housing (12), on which a vent pipe (13) is provided. The vent pipe (13) on the front side of the housing (12) is connected to the outlet end of the pressure safety mechanism (4), and the vent pipe (13) on the rear side of the housing (12) is connected to the drying mechanism (6). A colorimetric reagent is provided inside the housing (12). After the gas enters the housing (12) through the vent pipe (13), the colorimetric reagent comes into contact with the gas, thereby detecting the gas. A gas colorimetric reaction chamber (18) is provided inside the housing (12). The contact surface between the gas colorimetric reaction chamber (18) and the housing (12) is set as a viewing window (11). The vent pipe (13) and the... A gas colorimetric reaction chamber (18) is connected, and a carrier strip (17) carrying the colorimetric agent is movable and sealed through the gas colorimetric reaction chamber (18). At least a portion of the carrier strip (17) is located inside the gas colorimetric reaction chamber (18), and the remaining portion of the carrier strip (17) is located outside the gas colorimetric reaction chamber (18). A colorimetric agent liquid chamber (16) is provided inside the outer shell (12), and at least a portion of the carrier strip (17) is located inside the colorimetric agent liquid chamber (16). A winding wheel (14) is rotatably provided inside the outer shell (12). One end of the carrier strip (17) inside the colorimetric agent liquid chamber (16) passes through the gas colorimetric reaction chamber (18) and then winds around the winding wheel (14). After the collection begins, check the color reaction through the window (11). If no color reaction is found, it means that there is no hydrogen sulfide in the collected gas, and continue the subsequent collection process. If a color reaction is observed, it indicates that the collected gas contains hydrogen sulfide, and collection should be stopped.

2. The gas tracer sampling device for fracturing monitoring according to claim 1, characterized in that, At least one fulcrum (15) is provided inside the outer casing (12) to guide the carrier strip (17).

3. The gas tracer sampling device for fracturing monitoring according to claim 1, characterized in that, The carrier strip (17) is arranged in a spiral coiled manner inside the color developer liquid tank (16).

4. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 3, characterized in that, The pressure reducing assembly (30) includes a first pressure reducing valve (2) and a second pressure reducing valve (3) connected in series.

5. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 3, characterized in that, The pressure safety mechanism (4) is configured as an explosion-proof ball valve.

6. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 3, characterized in that, Multiple sampling solenoid valves (8) are arranged in parallel downstream of the drying mechanism (6), and a gas collection bottle (10) is arranged downstream of each sampling solenoid valve (8).

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