Gas tracer sampling device for fracturing monitoring

Abstract

The invention belongs to the technical field of petroleum engineering gas sampling, and particularly relates to a gas tracer sampling device for fracturing monitoring. The gas tracer sampling device for fracturing monitoring comprises a connector stop valve, a pressure reduction assembly, a pressure safety mechanism, a gas detection mechanism, a drying mechanism, a sampling electromagnetic valve and a gas collection bottle which are sequentially connected from upstream to downstream. According to the invention, automatic gas sampling and gas detection can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum engineering gas sampling, and in particular relates to a gas tracer sampling device for fracturing monitoring. Background Art

[0002] At present, continuous tubing array test instruments and distributed optical fiber temperature and pressure tests are the main technical means for horizontal well production profile testing. The application of continuous tubing array test instrument technology is limited in deep wells, sand-producing wells, small boreholes, complex structure wells, and high-temperature and high-pressure oil and gas wells. Optical fiber temperature and pressure testing has the characteristics of long-term monitoring, high cost, difficult construction and difficult data interpretation, and the technology needs to be further improved.

[0003] The slow-release tracer production profile test technology uses tracers with different identification numbers to be placed in different production layers underground. During the production process, the tracers are dissolved in the production fluids of different layers and returned to the wellhead, and then wellhead sampling and laboratory analysis are performed. Through the different physical properties and concentration analysis of tracers, the fluid properties and production of different layers can be inverted. This technology has the characteristics of wide applicability, low cost, and long-term monitoring of horizontal well production profiles, and has significant advantages in technology and cost.

[0004] According to the different phases of fluids monitored by tracers, tracers can be divided into three categories: oil-soluble tracers, water-soluble tracers and gas-soluble tracers. Gas-soluble tracers monitor the methane gas produced by different fracturing sections in horizontal wells. The concentration of different types of gas-soluble tracers can quantitatively characterize the gas production contribution of the corresponding fracturing layer section.

[0005] Based on the current situation of tracer field application, the technology still has the following deficiencies in its specific implementation: first, the quality of field sampling is greatly affected by human factors, and samplers often miss or make mistakes; second, manual field sampling cannot meet the needs of long-term monitoring; third, there is a lack of real-time remote control system for sampling, and if problems occur, it cannot be fed back to relevant personnel in a timely manner. In order to solve the above deficiencies in the existing technology and ensure the quality of tracer sampling, an automatic sampling device that can replace manual sampling, can be monitored for a long time, and can achieve remote control is proposed.

[0006] Chinese patent document CN212159241U discloses a VOCS oil and gas collection device, which relates to the technical field of VOCS processing devices. The VOCS oil and gas collection device includes a cavity, a water tank is fixed on the side of the cavity, and the water tank contains sealing water. The side wall of the connection between the cavity and the water tank is provided with a liquid regulating port, and the liquid regulating port penetrates the side wall of the cavity and the water tank at the same time. The bottom surface of the cavity is penetrated by a pipeline, and the pipeline penetrates the bottom surface of the cavity. In the utility model, a water seal is adopted, and a water volume regulating device is used to ensure that the VOCS will not be excessively released due to too low a water level, and it also acts as a flame arrester. The baffle can prevent the gas in the pressure relief pipe from escaping from the position of the water volume regulating device. Thereby avoiding the loss of oil products, and at the same time, avoiding the excessive negative pressure in the oil tank, which causes the instability of the container, causes the container to deform, and causes accidents.

[0007] Chinese patent document CN212059572U relates to the field of oil and gas collection equipment, and discloses a pressure-sensitive sampling oil and gas collection device. The pressure-sensitive sampling oil and gas collection device includes an airflow sensing mechanism for sensing the airflow in the oil and gas pipe. The airflow sensing mechanism is connected to the detection mechanism, and the airflow drives the impeller to rotate, which ultimately drives the code disk in the detection mechanism to rotate. The mechanical rotation of the code disk causes the light signal irradiated on the photoelectric sensor to change, thereby generating different current signals. The single-chip computer judges the airflow information according to the current to realize the oil and gas flow detection in the oil and gas pipe. When there is oil and gas flow, the single-chip computer controls the air extraction mechanism to automatically extract air, replacing manual sampling, which is convenient and practical and saves human resources; when sampling, sampling is performed under the control of the single-chip computer when the oil and gas waste gas in the oil and gas pipe is stably flowing, thereby ensuring the sampling accuracy. When sampling, the air in the joint and the air extraction mechanism can be discharged in advance under the control of the single-chip computer to avoid the air in the instrument affecting the accuracy of the sample.

[0008] Chinese patent document CN216771209U relates to the field of natural gas, and specifically to natural gas sample collection technology. The utility model is to meet the needs of automatic natural gas sample collection in the process of accurate measurement of natural gas energy and reliable measurement of natural gas calorific value, thereby providing a natural gas sample automatic collection device, including a cumulative gas sample collection device, a gas circuit control unit, an MCU control unit and a gas sample storage unit; the natural gas sample collection branch pipeline is connected to the gas inlet of the chromatographic analysis unit through the No. 1 gas outlet of the cumulative gas sample collection device; the gas circuit control unit is used to control the cumulative gas sample collection device to collect gas samples; the signal input or output end of the gas circuit control unit is connected to the signal output or input end of the MCU control unit; the chromatographic analysis unit signal input or output end of the MCU control unit is connected to the signal output or input end of the chromatographic analysis unit. The utility model is suitable for automatic natural gas sample collection in the process of accurate measurement of natural gas energy and reliable measurement of natural gas calorific value. Summary of the invention

[0009] In view of the above-mentioned technical problems, 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 stop valve, a pressure reducing assembly, a pressure insurance mechanism, a gas detection mechanism, a drying mechanism, a sampling solenoid valve and a gas collection bottle connected in sequence from upstream to downstream.

[0011] In a preferred embodiment, the gas detection mechanism includes a shell, a ventilation pipe is arranged on the shell, and a color developer is arranged in the shell. After the gas enters the shell through the ventilation pipe, the color developer contacts the gas, thereby detecting the gas.

[0012] In a preferred embodiment, a gas color development reaction chamber is arranged in the outer shell, the ventilation pipe is connected to the gas color development reaction chamber, and a carrier strip carrying the color developer is movably sealed and passed through the gas color development reaction chamber, at least a part of the carrier strip is located in the gas color development reaction chamber, and the rest of the carrier strip is located outside the gas color development reaction chamber.

[0013] In a preferred embodiment, a developer liquid tank is disposed in the housing, and at least a portion of the carrier strip is located in the developer liquid tank.

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

[0015] In a preferred embodiment, at least one fulcrum for guiding the carrier strip is provided in the housing.

[0016] In a preferred embodiment, the carrier strip is arranged in the developer liquid tank in a spirally coiled posture.

[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 insurance 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 corresponding gas collection bottle is arranged downstream of each of the sampling solenoid valves.

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

[0021] The present invention can improve the collection efficiency through the electromagnetic sampling method and avoid the error of manual sampling. The present invention is provided with a gas detection mechanism and a drying mechanism, which can ensure the quality of the gas sample. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0024] Figure 2 A schematic diagram of the appearance of a gas detection mechanism according to an embodiment of the present invention;

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

[0026] In the figure: 1. Interface stop valve; 30. Pressure reducing assembly; 2. First pressure reducing valve; 3. Second pressure reducing valve; 4. Pressure insurance mechanism; 5. Gas detection mechanism; 6. Drying mechanism; 7. Pressure sensor; 8. Sampling solenoid valve; 9. Waste gas discharge pipeline; 10. Gas collection bottle; 11. Window; 12. Shell; 13. Ventilation pipe; 14. Winding wheel; 15. Fulcrum; 16. Color developer liquid tank; 17. Carrier strip; 18. Gas color development reaction tank; 19. Inlet and outlet slots; 20. Color developer; 100. Gas tracer sampling device for fracturing monitoring.

[0027] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

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

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

[0030] Figure 1 FIG. 1 shows the structure of a gas tracer sampling device 100 for fracturing monitoring according to the present invention. Figure 1 As shown, the gas tracer sampling device 100 for fracturing monitoring includes an interface stop valve 1, a pressure reducing assembly 30, a pressure insurance mechanism 4, a gas detection mechanism 5, a drying mechanism 6, a sampling solenoid valve 8 and a gas collection bottle 10 which are sequentially connected 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 the prior art, the process of collecting tracer gas samples in the oil field is to manually hold the collection tube to the separator or the blowout line to collect the gas (natural gas). According to the present invention, the upstream of the interface stop valve 1 is connected to the valve interface of the field separator or the blowout prevention line, and the gas flows out from the separator or the blowout line, passes through the interface stop valve 1, the pressure reducing assembly 30, the pressure insurance mechanism 4, the gas detection mechanism 5, and the drying mechanism 6 in sequence, and finally under the switch control of the sampling solenoid valve 8, the gas is collected according to the preset sampling time.

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

[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. The first pressure reducing valve 2 and the second pressure reducing valve 3 are both 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 stop valve 1 through a pipeline. The first pressure reducing valve 2 is a first-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 through a pipeline. The second pressure reducing valve 3 is a two-stage pressure reducing valve, which can further reduce the gas pressure from 4MPa to 1MPa.

[0037] The pressure of the gas after passing through the interface stop valve 1 is usually about 30 MPa. The present invention effectively reduces the gas collection pressure by connecting the first pressure reducing valve 2 and the second pressure reducing valve 3 in series, thereby ensuring the safety of the collection personnel.

[0038] The pressure insurance 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 through a pipeline. The pressure insurance mechanism 4 serves as the pressure insurance of the entire acquisition device. Its design purpose is mainly to protect the integrity and safety of the subsequent device system when the pressure reducing component 30 fails to work normally. In this embodiment, the insurance pressure of the explosion-proof ball valve as the pressure insurance mechanism 4 is 10MPa, that is, when the gas pressure exceeds 10MPa, the explosion-proof ball valve automatically closes the gas channel, thereby effectively protecting the subsequent structure.

[0039] According to the present invention, Figure 2 and Figure 3 As shown, the gas detection mechanism 5 includes a shell 12, a ventilation pipe 13 is arranged on the shell 12, and a color developer is arranged in the shell 12. After the gas enters the shell 12 through the ventilation pipe 13, the color developer contacts the gas, thereby detecting the gas.

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

[0041] The type of color developer in the gas detection mechanism 5 can be changed according to the test requirements. In this embodiment, the gas detection mechanism 5 is used to detect the hydrogen sulfide content in natural gas, so the color developer placed in the housing 12 is a hydrogen sulfide color developer.

[0042] There are many options for hydrogen sulfide colorimetric reagents, such as the most commonly used methylene blue method for measuring hydrogen sulfide in colorimetry, the lead method, mercury method, copper method, etc., which are commonly used in the detection tube method. In addition, sodium ferricyanide nitrite can also be selected. Under alkaline conditions, S in hydrogen sulfide 2- It can react with Na2Fe(CN)5NO to generate red-purple Na4Fe(CN)5NOS, which has obvious color development, and can develop color in 5 minutes at the fastest. It has high resolution and strong anti-interference ability. Considering that the gas detection mechanism 5 is an on-site detection, it is required to react quickly with the gas to be detected and develop color immediately, and the color change must be obvious. Therefore, the color developer in the gas detection mechanism 5 is preferably a 3% sodium nitrosoferricyanide solution, and the alkalinity of the solution is controlled to be about pH=12. The color developer can show a color reaction within 5 minutes.

[0043] In a preferred embodiment, a gas color development reaction chamber 18 is provided in the housing 12, and the gas color development reaction chamber 18 is a space closed relative to the housing 12. In this embodiment, the vent pipe 13 is connected to the gas color development reaction chamber 18, that is, the vent pipe 13 cannot transport gas to the space between the gas color development reaction chamber 18 and the housing 12, and can only transport gas to the inside of the gas color development reaction chamber 18. The carrier strip 17 carrying the color developer is movably sealed and penetrated on the gas color development reaction chamber 18, at least part of the carrier strip 17 is located in the gas color development reaction chamber 18, and the rest of the carrier strip 17 is located outside the gas color development reaction chamber 18. Through this arrangement, after the carrier strip 17 located in the gas color development reaction chamber 18 undergoes a color change reaction, the carrier strip 17 can be pulled to move the carrier strip 17 relative to the gas color development reaction chamber 18, thereby completing the rapid replacement of the color developer and saving operation time.

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

[0045] In a preferred embodiment, the gas color reaction chamber 18 is configured as a triangular tube, one side of which contacts the top surface of the housing 12 to form an inverted triangle. The contact surface between the gas color reaction chamber 18 and the housing 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 housing 12 is a stainless steel rectangular parallelepiped housing with an opening in the middle of the top, and the viewing window 11 is arranged at the top opening position of the housing 12 to seal the top of the housing 12. The viewing window 11 is the top surface of the gas color development reaction chamber 18, and two other stainless steel surfaces are arranged in the housing 12 according to the triangular tube shape of the gas color development reaction chamber 18.

[0047] Entrance and exit slots 19 are arranged on the other two triangular side surfaces of the gas color development reaction chamber 18, and rubber seals are arranged at the edge positions of the entrance and exit slots 19. One end of the carrier strip 17 enters the gas color development reaction chamber 18 from one of the entrance and exit slots 19, and then moves out from the other entrance and exit slot 19. The seals at the edge of the entrance and exit slots 19 can play a sealing role to prevent the gas in the gas color development reaction chamber 18 from flowing to the outer shell 12 and the space outside the gas color development reaction chamber 18, thereby preventing the gas from contaminating the color developer on the carrier strip that has not entered the gas color development reaction chamber 18.

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

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

[0050] like Figure 3 As shown, in this embodiment, the top of the developer liquid tank 16 is open and arranged on the right side of the inner part of the housing 12, and is located on the right side of the gas color development reaction chamber 18. The carrier strip 17 exposed on the right side of the gas color development reaction chamber 18 is located in the developer liquid tank 16, and the developer 20 is arranged in the developer liquid tank 16, which can infiltrate the carrier strip 17. Under this arrangement, when the carrier strip 17 located in the gas color development reaction chamber 18 needs to be replaced after participating in the reaction, the carrier strip 17 can be pulled from the left side, so that the carrier strip 17 infiltrated with the developer 20 in the developer liquid tank 16 can enter the gas color development reaction chamber 18.

[0051] In a preferred embodiment, the carrier strip 17 is disposed in a spirally coiled posture in the developer liquid tank 16. In this arrangement, when the carrier strip 17 is pulled, the spirally coiled carrier strip 17 in the developer liquid tank 16 will inevitably rotate. In this case, even if there is only a very shallow amount of developer 20 in the developer liquid tank 16, the carrier strip 17 that is about to be removed from the developer liquid tank 16 can be contaminated with the developer 20.

[0052] According to the present invention, in a preferred embodiment, a winding wheel 14 is rotatably arranged in the housing 12. Figure 3 As shown, the winding wheel 14 is arranged on the left side of the housing 12, and is located on the left side of the gas color development reaction chamber 18. One end of the carrier strip 17 in the color development agent liquid chamber 16 passes through the gas color development reaction chamber 18 from right to left, and is wound on the winding wheel 14. Furthermore, the rotation axis of the winding wheel 14 extends to the outside of the housing 12, so that a driving mechanism can be connected to the outside to rotate the winding wheel 14.

[0053] According to the present invention, in a preferred embodiment, at least one fulcrum 15 for guiding the carrier strip 17 is provided in the housing 12. Figure 3 As shown, this embodiment is provided with two fulcrums 15 , wherein one fulcrum 15 is located between the gas color development reaction chamber 18 and the color developer liquid chamber 16 , and the other fulcrum 15 is located between the gas color development 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 arranged in the drying tube.

[0055] Specifically, the desiccant material is a molecular sieve or silica gel that absorbs the liquid phase. The material of the drying tube is 304 or 316 stainless steel, and the pressure resistance is 10MPa. The function of the drying mechanism 6 is to further separate the liquid phase molecules in the gas, especially when the gas-liquid separator is not enabled on site, the interface stop valve 1 can only be used at the instrument valve of the spray line, and the collected fluid is a gas-liquid mixed phase. Therefore, the drying mechanism 6 of the present invention is particularly important and can act as a gas-liquid separator, effectively absorbing liquid and ensuring the purity of the gas sample.

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

[0057] In this embodiment, three sampling solenoid valves 8 are provided, and the three sampling solenoid valves 8 can be timed and opened in sequence through a remote control program. The sampling solenoid valve 8 is provided with two outlet ends, one of which is connected to a gas collection bottle 10, and the other is connected to an exhaust gas discharge pipeline 9.

[0058] Before each sampling, the residual gas collected last time is emptied through the waste gas exhaust pipeline 9 to avoid interfering with the gas collected this time. After 5 to 10 minutes of exhaust, the sampling solenoid valve 8 automatically switches to close the waste gas exhaust pipeline 9 and switches to open the pipeline 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 of which is used to receive gas from the sampling solenoid valve 8, and the other is used to discharge the air in the gas collection bottle 10 and ensure 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] The use of tracers for fracturing monitoring usually has a sampling period of 1 to 3 months. Currently, there is no automated sample collection device for tracer monitoring at the fracturing site. During the 1 to 3 month collection period, the on-site gas test team is generally required to manually collect samples at regular intervals and in fixed quantities. Due to the complex on-site conditions and the varying operating levels of the collectors, omissions and wrong sampling often occur, which makes it difficult to ensure sample quality and affects the interpretation of the results. Therefore, the present invention can replace manual sampling, ensure sample quality, improve collection efficiency, and reduce labor costs. If excessive pressure is encountered during gas sample collection, it will also cause certain dangers to the collectors. The present invention fully considers the on-site HSE management requirements, reduces the gas pressure at the interface to 1MPa through two decompressions, and installs a pressure insurance mechanism 4, which effectively ensures the safety of personnel and the on-site environment.

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

[0062] When the gas tracer enters the sample collection cycle, the collector first connects the interface stop valve 1 to the gas pipeline valve of the on-site gas-liquid separator or the blowdown pipe line (depending on the actual activation situation on site, the gas-liquid separator is preferred), and the outlet end of the interface stop valve 1 is connected to a hose, and the hoses are connected in sequence as shown in the figure, wherein the pressure reducing assembly 30 and the pressure insurance mechanism 4 are an integrated structure, followed by the gas detection mechanism 5 and the drying tube that has been filled with sufficient desiccant. Since there are consumable parts inside the gas detection mechanism 5 and the drying tube, in order to facilitate replacement, the entire gas detection mechanism 5 and the drying tube are independent structures and the two sides are connected by hoses to stainless steel pagoda heads.

[0063] After the collection starts, first check the color reaction 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 the collected gas contains hydrogen sulfide. The valve must be closed immediately, and relevant personnel must be notified for processing, and subsequent collection work must be stopped.

[0064] During the normal collection cycle, the collector needs to pay attention to the state of the desiccant (the color and volume of the desiccant will change as the amount of water absorbed increases), and replace the saturated desiccant in time. Finally, the collector connects three gas collection bottles 10 filled with molecular sieves to the one-way valves of the three outlets. The three outlets are distinguished by labels 1, 2, and 3, respectively. No. 1 corresponds to the earliest collection time, No. 2 corresponds to the middle collection time, and No. 3 corresponds to the latest collection time. The body of the gas collection bottle 10 is labeled with the collection date and time, and the gas tracer sampling device 100 for fracturing monitoring is now installed.

[0065] The gas tracer sampling device 100 for fracturing monitoring also includes an electric control part, which is used to control the sampling solenoid valve 8. Specifically, the power supply of the electric control part is connected to the on-site electric cabinet, the main switch is turned on, and then the separator valve is unscrewed, and then the interface stop valve 1 is slowly unscrewed, and the readings of the pressure reducing assembly 30 and the pressure sensor 7 are observed, and the gas can be checked to see whether it can flow out normally, and whether the window 11 of the gas detection mechanism 5 has a color reaction, and it is confirmed that there is no hydrogen sulfide gas, and then the sampling can be carried out normally, and the terminal control system of the electric control part is turned on, and the network connection is checked to see whether it is normal, and the equipment is debugged until the signal reception is normal.

[0066] Set the collection frequency and time in the terminal control system (mobile phone or computer). Generally, the collection system of gas samples in the 1st to 15th days of the collection cycle is once / 8 hours. The collection time can be set according to the actual situation, such as 8:00, 16:00, and 24:00; the collection system in the 16th to 30th days of the cycle is once / 12 hours. The collection time can be set according to the actual situation, such as 8:00 and 20:00; the collection system after the 30th day of the cycle is once / 24 hours. The collection time can be set according to the actual situation, such as 8:00. When the last collection of the day is completed, the control terminal will receive a reminder message that today's collection has been completed. The collector takes away all samples, and then connects the new gas collection bottle 10 to the one-way valve of the outlet. Note that the time marked on the gas collection bottle 10 corresponds to the mark on the outlet.

[0067] It should be noted that the directional terms or qualifiers "upper", "lower", "left", "right", etc. used in this application are all relative to the referenced Figure 3 They are not intended to define the absolute positions of the components involved, but may vary depending on the specific circumstances.

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

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas tracer sampling device for fracturing monitoring, characterized in that: It comprises an interface stop valve (1), a pressure reducing assembly (30), a pressure insurance mechanism (4), a gas detection mechanism (5), a drying mechanism (6), a sampling electromagnetic valve (8) and a gas collection bottle (10) which are connected in sequence from upstream to downstream.

2. The gas tracer sampling device for fracturing monitoring according to claim 1, characterized in that: The gas detection mechanism (5) comprises a housing (12), a ventilation pipe (13) is arranged on the housing (12), a color developer is arranged in the housing (12), and after the gas enters the housing (12) through the ventilation pipe (13), the color developer contacts the gas, thereby detecting the gas.

3. The gas tracer sampling device for fracturing monitoring according to claim 2, characterized in that: A gas color development reaction chamber (18) is arranged in the outer shell (12), the ventilation pipe (13) is connected to the gas color development reaction chamber (18), and a carrier strip (17) carrying the color developer is movably sealed and penetrated through the gas color development reaction chamber (18), at least a part of the carrier strip (17) is located in the gas color development reaction chamber (18), and the rest of the carrier strip (17) is located outside the gas color development reaction chamber (18).

4. The gas tracer sampling device for fracturing monitoring according to claim 3, characterized in that: A developer liquid tank (16) is arranged in the housing (12), and at least a portion of the carrier strip (17) is located in the developer liquid tank (16).

5. The gas tracer sampling device for fracturing monitoring according to claim 4, characterized in that: A winding wheel (14) is rotatably arranged in the outer shell (12), and one end of the carrier strip (17) in the developer liquid chamber (16) passes through the gas color development reaction chamber (18) and is then wound around the winding wheel (14).

6. The gas tracer sampling device for fracturing monitoring according to claim 5, characterized in that: At least one fulcrum (15) for guiding the carrier strip (17) is arranged in the housing (12).

7. The gas tracer sampling device for fracturing monitoring according to claim 4, characterized in that: The carrier strip (17) is arranged in the developer liquid tank (16) in a spirally coiled posture.

8. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 7, characterized in that: The pressure reducing assembly (30) comprises a first pressure reducing valve (2) and a second pressure reducing valve (3) which are connected in series.

9. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 7, characterized in that: The pressure insurance mechanism (4) is configured as an explosion-proof ball valve.

10. The gas tracer sampling device for fracturing monitoring according to any one of claims 1 to 7, characterized in that: A plurality of the sampling solenoid valves (8) are arranged in parallel downstream of the drying mechanism (6), and a corresponding gas collection bottle (10) is arranged downstream of each of the sampling solenoid valves (8).

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