Gas closed sampling device

Abstract

The utility model relates to a gas closed sampling device. A sampling manifold block of the gas closed sampling device is internally provided with a sampling channel, a pressure measuring channel and a sample gas backflow channel which are communicated with an associated gas channel of the manifold block; a sampler provided with a detection pipe and a piston is connected in the sampling channel, is communicated with the integrated block associated gas channel and is communicated with the sample gas backflow channel through a sample gas backflow pipe; a pressure gauge is arranged at the upper end of the pressure measuring channel; a sampling control valve is arranged in the sampling channel, and a pressure measuring control valve is arranged in the pressure measuring channel; the two ends of the integrated block associated gas channel are connected with a sampling pipeline inlet gate and a sampling pipeline outlet gate which are installed in the associated gas conveying pipelines on the two sides of the associated gas control gate through sampling pipelines respectively. The device can be widely applied to detection of associated gas in an oil field production field, can provide reliable gas source component data for a purification system of a gas engine unit using the associated gas, and effectively eliminates adverse effects caused by gathering of the associated gas in an oil well casing.

Description

Technical Field

[0001] The utility model relates to the technical field of closed sampling of associated gas in the process of oilfield production, in particular to a gas closed sampling device. Background Art

[0002] During the process of oil exploitation, the gas contained in the crude oil will separate from the crude oil as the bottom hole pressure decreases, forming associated gas and accumulating in the casing of the oil well. As production progresses, the associated gas accumulates more and more in the casing, resulting in an increase in casing pressure and reducing the development effect of the oil well.

[0003] To solve the above problems, using associated gas as fuel for a gas engine set can not only realize the utilization of associated gas but also solve the power consumption problem at the production site. However, using associated gas for power generation requires a gas engine, and the gas engine has certain requirements for the gas source. It is necessary to separate water, impurities, and heavy hydrocarbon substances in the associated gas, which all need to be completed by a purification system; at the same time, the gas engine set has certain requirements and limitations on the hydrogen sulfide content in the associated gas. Because hydrogen sulfide is corrosive, when its content is high, it will endanger the normal operation of the gas engine. Therefore, it is necessary to monitor the hydrogen sulfide content during daily operation.

[0004] Currently, there are the following several methods and devices related to the sampling of associated gas: Chinese Patent Application Publication No. CN109030126A discloses a closed sampling and analysis device for associated gas at the tank mouth, which relates to the technical field of closed sampling and analysis of associated gas at the tank mouth of an oilfield. It includes a buffer tank, a gas-liquid separation air cooler, a suction pump, and a gas collection box. The above device has a reasonable and compact structure and is convenient to use. It realizes for the first time the detection of the total gas volume and sampling analysis without modifying the existing buffer tank of the transfer station, and also realizes that when the gas collection box collects gas, it can avoid the harm to the human body caused by the high temperature at the tank top and the discharge of toxic gases; at the same time, the above device can realize the atmospheric pressure sampling of associated gas during the process of heavy oil huff and puff exploitation and the detection of the total gas volume, and there is no risk of pipeline pressure buildup during sampling, improving the safety production index and ensuring atmospheric pressure and homogeneous sampling.

[0005] The above device can realize sampling of the associated gas at the on-site tank mouth on the pipeline, but only describes the sampling process and does not describe the specific structure of the sampling device, so it cannot realize the detection of on-site gas.

[0006] Chinese Patent Authorization Publication No. CN106989963B discloses a method for hermetically sampling pipeline gas, which includes the following steps: First step: The material in the process pipeline is transported from the pump outlet pipe to the material inlet flange; this cross-conversion four-way valve has a first interface, a second interface, a third interface, and a fourth interface; Second step: When sampling is required, just turn the cross-conversion four-way valve 90 degrees. When it is turned to the sampling position, fresh material displaces and flushes the sampling cylinder. After closing the cylinder outlet needle valve and the cylinder inlet needle valve, sampling of the sampling cylinder is completed; Third step: Turn the cross-conversion four-way valve to the circulation position to start circulation; Fourth step: Open the vent valve, release the pressure in the first quick connector and the second quick connector at both ends of the sampling cylinder to the flare for recovery, and close the vent valve when the pressure is released to zero to complete the sampling work; The above method is simple and convenient to operate and can avoid misoperation.

[0007] The above patent technology can sample the hermetic gas into the sampling bottle by switching the pipeline process, but it cannot detect the gas sampled on-site.

[0008] Therefore, it is necessary to develop a hermetic sampling and detection device with a simple structure, safety and convenience, and capable of detecting associated gas at the oilfield production site. Utility Model Content

[0009] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present utility model is to provide a gas hermetic sampling device, which can realize the sampling and detection of associated gas at the production site, facilitate the mastery of the specific components of the associated gas at the oilfield production site and on-site utilization. Provide reliable gas source component detection data for the purification system of the gas engine group used at the production site, so as to ensure the normal operation of the gas engine group and extend the service life of the gas engine group. While effectively utilizing the wellhead associated gas, solve the adverse effects caused by the accumulation of associated gas in the oil well casing, improve the oil production effect of the oil well, and facilitate the daily management of the oil well.

[0010] To achieve the above purpose, the present utility model adopts the following technical solutions: A gas hermetic sampling device is provided with a pressure gauge and a detection tube, wherein: A sampling channel, a pressure measurement channel, and a sample gas return channel connected to the associated gas channel of the integrated block are provided in the sampling integrated block; A sampler equipped with a detection tube and a piston is connected to the sampling channel to communicate with the associated gas channel of the integrated block and is connected to the sample gas return channel through a sample gas return pipe. The pressure gauge is installed at the upper end of the pressure measurement channel; Both ends of the sample gas return pipe are respectively connected to a sample gas return control valve and a sample gas return channel control valve; A sampling control valve is installed in the sampling channel, and a pressure measurement control valve is installed in the pressure measurement channel; Both ends of the associated gas channel of the integrated block are respectively connected to the sampling pipeline inlet gate and the sampling pipeline outlet gate installed in the associated gas transmission pipelines on both sides of the associated gas control gate through sampling pipelines.

[0011] Preferably, the sampler is further provided with a detection tube base and a sampling tube. The piston is installed in the sampling tube, and the detection tube is installed in the detection tube base and communicated with the sampling channel. Both ends of the detection tube base are threadedly connected to the sampling tube and the sampling channel respectively.

[0012] Preferably, the detection tube base is provided with a central hole and non-equal-diameter outer circles at both ends. The outer circles at both ends of the detection tube base can be threadedly connected to the non-equal-diameter inner circles at the lower part of the sampling tube and the non-equal-diameter inner circles at the upper part of the sampling channel respectively. The inner circle at one end of the detection tube base connected to the sampling tube is a stepped inner circle, and this stepped inner circle is used as the limiting step for the detection tube.

[0013] Preferably, a first seal and a second seal are further provided in the non-threaded connection sections at both ends of the detection tube base. A detection tube seal is also installed between the large-diameter inner circle of the detection tube base and the detection tube.

[0014] Preferably, the piston in the sampling tube is connected to the lower end of a lead screw. A force application component is provided at the upper end of the lead screw. The lead screw in the sampling tube is threadedly connected to the central hole at the upper end of the sampling tube. A piston seal is provided on the outer circle of the piston.

[0015] Preferably, the sample gas return control valve connected to one end of the sample gas return pipe is installed in the sample gas return hole in the sampling tube. The sample gas return channel control valve connected to the other end of the sample gas return pipe is installed at the upper end of the sample gas return channel. The sample gas return hole is provided in the pipe wall of the sampling tube flush with the upper end face of the detection tube base.

[0016] Preferably, a lead screw insertion slot is provided in the piston body above the piston seal. The lead screw insertion slot is composed of a U-shaped slot and an arc-shaped slot parallel to and communicating with the U-shaped slot. The width of the U-shaped slot corresponds to the outer diameter formed by the lower annular groove of the lead screw. The height of the arc-shaped slot parallel to and communicating with the U-shaped slot in the upper part of the piston body corresponds to the height of the lead screw body below the lower annular groove of the lead screw.

[0017] Preferably, there are two sampling pipelines connected between the sampling integration block and the associated gas transmission pipeline and they are in an L shape. The two sampling pipelines are relatively connected at both ends of the associated gas channel in the integration block and between the sampling pipeline inlet gate and the sampling pipeline outlet gate in the associated gas transmission pipeline. The valve body of the sampling control valve is integrated in the sampling channel in the sampling integration block, and the valve core installed in the valve body of the sampling control valve is connected to the control valve handle installed outside the sampling integration block.

[0018] Preferably, a tee pipe and a first purge inlet gate and a first purge inlet connected to the side pipe orifice of the tee pipe are further installed in the sampling pipeline above the sampling pipeline inlet gate. The first purge inlet can be connected to a nitrogen gas source. The pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas transmission pipeline.

[0019] Preferably, a second purge gate is further installed in the sample gas return pipe outside the sample gas return control valve, and the second purge gate can be connected to a nitrogen gas source; the pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas transmission pipeline; the sample gas return pipe is a flexible pipe.

[0020] Compared with the prior art, the utility model has the following remarkable usage effects: The utility model can be widely applied to the detection of associated gas in the oilfield production site, and its application is safe, convenient and fast, and can realize the airtight sampling and detection of toxic gases in the oilfield production site. Specifically manifested in:

[0021] 1. The structure of the device is simple. The sampler and the pressure gauge are both installed in the sampling integration block. The sampling integration block is provided with an integration block associated gas channel, and its sampling pipeline is communicated with the sampling integration block. The airtight sampling of the associated gas in the associated gas transmission pipeline can be realized by switching the pipeline, which is convenient and fast.

[0022] 2. Before sampling, due to the piston having moved to the bottom of the sampling pipe, there is no extra space in the sampler, and there is no other residual gas except the gas extracted in this sampling, ensuring the purity of the sampled gas and the accuracy of each sampling detection.

[0023] 3. After sampling, the used harmful gas is pressed back into the associated gas transmission pipeline from the sampling return pipe and does not flow back through the detection pipe, so that the detection result is more accurate.

[0024] 4. The device is provided with two purge gates and forms two sets of purge circuits, making the disassembly of the device safer and more reliable.

[0025] 5. The utility model can provide reliable gas source component data for the purification system of the gas engine group, thereby ensuring the normal operation of the gas engine group and prolonging the service life of the gas engine group. When the associated gas from the oil well becomes the gas of the gas engine group, the adverse effects caused by the accumulation of the associated gas in the oil well casing are effectively eliminated, the oil production effect of the oil well is improved, and the daily management of the oil well is facilitated.

[0026] In summary, using the utility model to detect the associated gas in the associated gas transmission pipeline at the oilfield production site has convenient, safe and accurate usage effects, can conveniently and safely master the content of hydrogen sulfide in the associated gas at the oilfield production site, provide accurate data for on-site utilization, and has remarkable usage effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the utility model and do not constitute a limitation to the utility model. In the drawings:

[0028] Figure 1 This is the structural schematic diagram of the present utility model.

[0029] Figure 2 is Figure 1 the structural schematic diagram of the sampler in

[0030] Figure 3 is Figure 2 the structural schematic diagram of the piston in the sampler in

[0031] In the figure: associated gas transmission pipeline 1, associated gas control gate 2, sampling pipeline 3, sampling pipeline inlet gate 4, sampling pipeline outlet gate 5, tee 6, first purge inlet gate 7, first purge inlet 8; sampling integrated block 9, sampling channel 9.1, sampling control valve 9.2, sample gas return channel 9.3, sample gas return channel control valve 9.4, associated gas channel of integrated block 9.5; pressure measurement channel 10, pressure measurement control valve 11, pressure gauge 12; sampler 13, force application component 13.1, lead screw 13.2, piston 13.3, piston seal 13.4, seal 1 13.5, test tube seat 13.6, test tube seal 13.7, test tube 13.8, seal 2 13.9, sampling tube 13.10, sample gas return hole 13.11, sample gas return control valve 13.12, sample gas return pipe 13.13, second purge gate 13.14. Specific embodiments

[0032] The attached drawings are only for reference and illustration purposes, and are not intended to limit the protection scope of the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0035] See Figure 1 - Figure 3 , a gas-tight sampling device, provided with a pressure gauge 12 and a detection tube 13.8, wherein: in the sampling integrated block 9, there are a sampling channel 9.1, a pressure measurement channel 10 and a sample gas return channel 9.3 that are connected to the associated gas channel 9.5 of the integrated block;

[0036] The sampler 13 equipped with the detection tube 13.8 and the piston 13.3 is connected in the sampling channel 9.1, communicates with the associated gas channel 9.5 of the integrated block, and is connected to the sample gas return channel 9.3 through the sample gas return pipe 13.13. The pressure gauge 12 is installed at the upper end of the pressure measurement channel 10; both ends of the sample gas return pipe 13.13 are respectively connected to the sample gas return control valve 13.12 and the sample gas return channel control valve 9.4; a sampling control valve 9.2 is installed in the sampling channel 9.1, and a pressure measurement control valve 11 is installed in the pressure measurement channel 10; both ends of the associated gas channel 9.5 of the integrated block are respectively connected to the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5 installed in the associated gas transmission pipelines 1 on both sides of the associated gas control gate 2 through the sampling pipeline 3.

[0037] The present utility model is connected to the associated gas transmission pipelines 1 on both sides of the associated gas control gate 2 through the sampling pipeline 3, and controls the gas volume of the associated gas entering the sampling pipeline 3 through the associated gas control gate 2, the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5.

[0038] Open the pressure measuring control valve 11. The pressure of the associated gas from the associated gas transmission pipeline 1 can be detected by the pressure gauge 12 installed at the upper end of the pressure measuring channel 10. Open the sampling control valve 9.2. The piston 13.3 of the sampler 13 in the sampling channel 9.1 extracts the associated gas, and the extracted associated gas enters the detection tube 13.8 for comparison. The detection tube 13.8 is a colorimetric tube. The content of hydrogen sulfide in the associated gas is determined jointly by the detection tube 13.8 and the pressure gauge 12. The associated gas that enters the sampler 13 and has been compared and detected by the detection tube 13.8 is pressed back into the integrated block associated gas channel 9.5 through the piston 13.3, the sample gas return pipe 13.13 and the sample gas return channel 9.3, and then flows back to the associated gas transmission pipeline 1 through the integrated block associated gas channel 9.5 and the sampling pipeline 3 communicated with it, completing the task of hermetically detecting the associated gas at the oilfield production site and providing convenience for measuring the associated gas at the oilfield production site.

[0039] The sampling control valve 9.2, the pressure measuring control valve 11, the sample gas return control valve 13.12 and the sample gas return channel control valve 9.4 installed in the present utility model ensure the on-off state of the associated gas in the present utility model. After the associated gas transmission pipeline 1 is installed with the present utility model, it can still operate normally.

[0040] The present utility model can be installed in the gas transmission pipeline of a gas well to detect the content of hydrogen sulfide in the gas. In this usage state, the associated gas transmission pipeline 1 is the gas transmission pipeline of the gas well.

[0041] The present utility model can also be installed in the gas transmission pipeline in the crude oil gathering and transportation station to detect the content of hydrogen sulfide in the gas transmission pipeline. In this usage state, the associated gas transmission pipeline 1 is the gas transmission pipeline in the crude oil gathering and transportation station.

[0042] When the present utility model is used to provide detection for the associated gas used as the fuel of a gas engine group, the associated gas transmission pipeline 1 is the transmission channel of the fuel required by the gas engine group.

[0043] The present utility model can provide reliable gas source component data for the purification system of the gas engine group, ensure the normal operation of the gas engine group, and extend the service life of the gas engine group. Using the associated gas as the fuel of the gas engine group can eliminate the adverse effects caused by the accumulation of the associated gas in the oil well casing, improve the oil production effect of the oil well, and facilitate the daily management of the oil well.

[0044] Using the present utility model to detect the associated gas in the associated gas transmission pipeline 1 at the oilfield production site has the advantages of convenience, safety and accuracy. It can conveniently and safely master the content of hydrogen sulfide in the associated gas at the oilfield production site and provide accurate data for the on-site utilization of the associated gas.

[0045] On the basis of the above-mentioned first embodiment, the present utility model further has the following embodiments:

[0046] A preferred embodiment: The sampler 13 is further provided with a detection tube seat 13.6 and a sampling tube 13.10. The piston 13.3 is installed in the sampling tube 13.10, and the detection tube 13.8 is installed in the detection tube seat 13.6 and communicated with the sampling channel 9.1. The two ends of the detection tube seat 13.6 are respectively threadedly connected to the sampling tube 13.10 and the sampling channel 9.1. Using threaded connection is more convenient for disassembly and installation.

[0047] A preferred embodiment: The detection tube seat 13.6 is provided with a central hole and non-equal-diameter outer circles at both ends. The outer circles at both ends of the detection tube seat 13.6 can be respectively threadedly connected to the non-equal-diameter inner circles at the lower part of the sampling tube 13.10 and the non-equal-diameter inner circles at the upper part of the sampling channel 9.1. The inner circle at one end of the detection tube seat 13.6 connected to the sampling tube 13.10 is a stepped inner circle, and this stepped inner circle is used as a limiting step for the detection tube 13.8, which can allow gas to pass through and is convenient for the installation of the detection tube 13.8.

[0048] A preferred embodiment: Sealing member one 13.5 and sealing member two 13.9 are further provided in the non-threaded connection sections at both ends of the detection tube seat 13.6. A detection tube seal 13.7 is also installed between the large-diameter inner circle of the detection tube seat 13.6 and the detection tube 13.8 to seal the gap between the detection tube seat 13.6 and the detection tube 13.8, so that the air flow can only pass through the detection tube 13.8.

[0049] A preferred embodiment: The piston 13.3 in the sampling tube 13.10 is connected to the lower end of the lead screw 13.2. The upper end of the lead screw 13.2 is provided with a force application member 13.1. The lead screw 13.2 in the sampling tube 13.10 is threadedly connected to the central hole at the upper end of the sampling tube 13.10. A piston seal 13.4 is provided on the outer circle of the piston 13.3, which can seal the gap between the piston 13.3 and the inner circle of the sampling tube 13.10. The force application member 13.1 can be a handle, a handwheel or a force application rod. Using the connection between the lead screw 13.2 and the piston 13.3 can make the movement of the piston 13.3 in the sampling tube 13.10 more stable. Compared with pulling the piston rod up and down, the work and movement of the piston 13.3 are safer and more reliable. During sampling, the lead screw 13.2 is rotated upward to drive the piston 13.3 to move upward, and the associated gas in the associated gas channel 9.5 of the integrated block is pumped into the sampling channel 9.1, the detection tube 13.8 and the sampling tube 13.10. After the detection is completed, the associated gas in the sampling tube 13.10 is all pressed back into the associated gas channel 9.5 of the integrated block through the sampling return pipe 13.13.

[0050] Preferred embodiment: The sample gas reflux control valve 13.12 connected to one end of the sample gas reflux pipe 13.13 is installed in the sample gas reflux hole 13.11 in the sampling pipe 13.10; the sample gas reflux channel control valve 9.4 connected to the other end of the sample gas reflux pipe 13.13 is installed at the upper end of the sample gas reflux channel 9.3; the sample gas reflux hole 13.11 is provided in the pipe wall of the sampling pipe 13.10 flush with the upper end face of the detection pipe seat 13.6. When the detection pipe seat 13.6 is connected to the sampling pipe 13.10, the upper end face of the detection pipe seat 13.6 is also the lower end face that the piston 13.3 can reach in the sampling pipe 13.10. The sample gas reflux hole 13.11 is provided in the pipe wall of the sampling pipe 13.10 at this position, and the extracted sample gas can be completely pressed back into the integrated block associated gas channel 9.5, ensuring that there are no harmful gases at the detection site, protecting the environment, and ensuring the physical health of the operators.

[0051] Preferred embodiment: A lead screw insertion groove is provided in the piston 13.3 body above the piston seal 13.4. The lead screw insertion groove is composed of a U-shaped groove and an arc-shaped groove parallel to and communicating with the U-shaped groove. The groove width of the U-shaped groove corresponds to the outer diameter formed by the lower annular groove of the lead screw 13.2, and the groove height of the arc-shaped groove parallel to and communicating with the U-shaped groove in the upper part of the piston 13.3 body corresponds to the height of the lead screw body below the lower annular groove of the lead screw 13.2. In this way, the lower annular groove of the lead screw 13.2 can be inserted into the U-shaped groove in the upper part of the piston 13.3, and the lead screw 13.2 body on both sides above and below the lower annular groove can be stuck on both sides of the U-shaped groove in the lead screw insertion groove of the piston 13.3, ensuring that when the lead screw 13.2 rotates upward or downward, the piston 13.3 does not rotate with it, protecting the piston seal 13.4 installed thereon from damage and extending the service life of the piston seal 13.4.

[0052] Preferred embodiment: There are two sampling pipelines 3 connected between the sampling integrated block 9 and the associated gas transmission pipeline 1, and they are in an L shape. The two sampling pipelines 3 are relatively connected between the two ends of the integrated block associated gas channel 9.5 and between the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5 in the associated gas transmission pipeline 1. Ensure that the associated gas transmission pipeline 1 can operate and produce normally both after installing and disassembling the present invention. The valve body of the sampling control valve 9.2 is integrated in the sampling channel 9.1 in the sampling integrated block 9, and the valve core installed in the valve body of the sampling control valve 9.2 is connected to the control valve handle installed outside the sampling integrated block 9. Rotate the control valve handle outside the sampling integrated block 9 to rotate the valve core installed in the valve body of the sampling control valve 9.2, opening or closing the sampling channel 9.1 to achieve the opening and closing of the sampling channel 9.1.

[0053] Preferred embodiment: A three-way pipe 6 is further installed in the sampling pipeline 3 above the sampling pipeline inlet gate 4, and a first purge inlet gate 7 and a first purge inlet 8 are connected to one side orifice of the three-way pipe 6. The first purge inlet 8 can be connected to a nitrogen gas source; the pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas transmission pipeline 1. The first purge inlet 8, the first purge inlet gate 7 and the three-way pipe 6 form a set of purge circuits, so that there is no residual sample gas in the sampling pipeline 3, ensuring safe disassembly, protecting the environment and the physical health of on-site operators.

[0054] Preferred embodiment: A second purge gate 13.14 is further installed in the sample gas return pipe 13.13 outside the sample gas return control valve 13.12. The second purge gate 13.14 can be connected to a nitrogen gas source; the pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas transmission pipeline 1; the sample gas return pipe 13.13 is a flexible pipe. The sample gas return pipe 13.13 includes but is not limited to a metal corrugated pipe and a high-pressure rubber pipe. Using a flexible pipe for the sample gas return pipe 13.13 facilitates disassembly and assembly. The second purge gate 13.14, the sample gas return pipe 13.13 and the sample gas return channel 9.3 form a set of purge circuits, so that there is no residual sample gas in the sampling pipe 13.10, and at the same time, preventing the residual gas from flowing back through the detection pipe 13.8, ensuring the accuracy of detection.

[0055] The usage method of the present utility model is as follows: 1. During sampling, install the detection pipe 13.8 into the detection pipe seat 13.6 and connect the detection pipe seat 13.6 to the sampling integration block 9. Install the sampling pipe 13.10 on the upper part of the detection pipe seat 13.6, and rotate the lead screw 13.2 to make the piston 13.3 located at the lowermost end of the sampling pipe 13.10.

[0056] 2. Open the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5, and close the associated gas control gate 2 to allow the associated gas to flow in the sampling pipeline 3.

[0057] 3. Open the sampling control valve 9.2 to connect the sampling channel 9.1 with the integration block associated gas channel 9.5.

[0058] 4. Slowly rotate the force application member 13.1 to drive the lead screw 13.2 to rotate synchronously, so that the piston 13.3 moves upward. As the pressure in the sampling pipe 13.10 decreases, the associated gas enters the sampling pipe 13.10 through the sampling channel 9.1 and the detection pipe 13.8 until the lead screw 13.2 moves to the set position, completing the sampling of the associated gas.

[0059] 5. After sampling is completed, close the sampling control valve 9.2, connect the sample gas return pipe 13.13, open the sample gas return control valve 13.12 and the sample gas return channel control valve 9.4; rotate the force - applying component 13.1 in the reverse direction to make the piston 13.3 move downward, and press the associated gas in the sampling pipe 13.10 back into the integrated block associated gas channel 9.5 through the sample gas return hole 13.11. When the piston 13.3 moves to the lowermost end of the sampling pipe 13.10, close the sample gas return control valve 13.12.

[0060] 6. Connect a nitrogen gas source at the second purge gate 13.14. The pressure of the nitrogen gas source is higher than the pressure of the associated gas in the associated gas pipeline 1. Open the second purge gate 13.14. After purging the associated gas in the sample gas return pipe 13.13 with nitrogen gas, sequentially close the sample gas return channel control valve 9.4, the second purge gate 13.14, and the sample gas return control valve 13.12, and then remove the sample gas return pipe 13.13.

[0061] 7. Remove the sampling pipe 13.10 and the test tube seat 13.6, take out the test tube 13.8, and the concentration of hydrogen sulfide in the associated gas in the associated gas pipeline 1 can be calculated according to the readings of the pressure gauge 12 and the test tube 13.8.

[0062] 8. Open the associated gas control gate 2, close the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5, and resume the normal operation of the associated gas pipeline 1.

[0063] 9. When it is necessary to remove the sampling pipeline 3, open the sampling pipeline outlet gate 5, connect a nitrogen gas source at the first purge inlet 8. The pressure of the nitrogen gas source is higher than the pressure of the associated gas in the associated gas pipeline 1. Open the first purge gate 7. After purging the associated gas in the sampling pipeline 3 with nitrogen gas, sequentially close the sampling pipeline outlet gate 5 and the first purge gate 7, and then the sampling pipeline 3 and the sampling integrated block 9 outside the sampling pipeline inlet gate 4 and the sampling pipeline outlet gate 5 can be removed.

[0064] The above - described embodiments are only typical embodiments, but the present utility model is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and inspiration of the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present utility model shall be included within the protection scope of the present utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A gas tight sampling device is provided with a pressure gauge and a detection tube, and is characterized in that: The sampling integrated circuit block is provided with a sampling channel, a pressure measurement channel and a sample gas return channel that are connected to the associated gas channel of the integrated circuit block; a sampler equipped with a detection tube and a piston is connected in the sampling channel to communicate with the associated gas channel of the integrated circuit block and is connected to the sample gas return channel through a sample gas return pipe, and a pressure gauge is installed at the upper end of the pressure measurement channel; both ends of the sample gas return pipe are respectively connected to a sample gas return control valve and a sample gas return channel control valve; a sampling control valve is installed in the sampling channel, and a pressure measurement control valve is installed in the pressure measurement channel; both ends of the associated gas channel of the integrated circuit block are respectively connected to a sampling pipe inlet gate and a sampling pipe outlet gate installed in the associated gas delivery pipes on both sides of the associated gas control gate through a sampling pipe.

2. The gas tight sampling device according to claim 1, characterized in that, The sampler is further provided with a detection tube seat and a sampling pipe. The piston is installed in the sampling pipe, and the detection tube is installed in the detection tube seat to communicate with the sampling channel; both ends of the detection tube seat are respectively threadedly connected to the sampling pipe and the sampling channel.

3. The gas tight sampling device according to claim 2, characterized in that, The detection tube seat is provided with a central hole and non-equal-diameter outer circles at both ends. The outer circles at both ends of the detection tube seat can be respectively threadedly connected to the non-equal-diameter inner circles at the lower part of the sampling pipe and the non-equal-diameter inner circles at the upper part of the sampling channel; the inner circle at one end of the detection tube seat connected to the sampling pipe is a stepped inner circle, and this stepped inner circle is used as a limiting step for the detection tube.

4. The gas tight sampling device according to claim 3, characterized in that, in Seal one and seal two are also provided in the non-threaded connection sections at both ends of the detection tube seat; a detection tube seal is also installed between the large-diameter inner circle of the detection tube seat and the detection tube.

5. The gas tight sampling device according to claim 4, characterized in that, The piston in the sampling pipe is connected to the lower end of a lead screw. A force application component is provided at the upper end of the lead screw. The lead screw in the sampling pipe is threadedly connected to the central hole at the upper end of the sampling pipe; a piston seal is provided on the outer circle of the piston.

6. The gas tight sampling device according to claim 3, characterized in that, The sample gas return control valve connected to one end of the sample gas return pipe is installed in the sample gas return hole in the sampling pipe; the sample gas return channel control valve connected to the other end of the sample gas return pipe is installed at the upper end of the sample gas return channel; the sample gas return hole is provided in the pipe wall of the sampling pipe flush with the upper end face of the detection tube seat.

7. The gas tight sampling device according to claim 5, characterized in that, A lead screw insertion groove is provided in the piston body above the piston seal. The lead screw insertion groove is composed of a U-shaped groove and an arc-shaped groove parallel to and communicating with the U-shaped groove. The groove width of the U-shaped groove corresponds to the outer diameter formed by the lower annular groove of the lead screw, and the groove height of the arc-shaped groove parallel to and communicating with the U-shaped groove in the upper part of the piston body corresponds to the height of the lead screw body below the lower annular groove of the lead screw.

8. The gas tight sampling device according to claim 1, characterized in that the connection There are two sampling pipes between the sampling integrated circuit block and the associated gas delivery pipe, and they are in an L shape. The two sampling pipes are relatively connected between both ends of the associated gas channel of the integrated circuit block and the sampling pipe inlet gate and the sampling pipe outlet gate in the associated gas delivery pipe; the valve body of the sampling control valve is integrated in the sampling channel of the sampling integrated circuit block, and the valve core installed in the valve body of the sampling control valve is connected to a control valve handle installed outside the sampling integrated circuit block.

9. The gas tight sampling device according to claim 1, characterized in that, A tee pipe and a first purge inlet gate and a first purge inlet connected to the side pipe orifice of the tee pipe are also installed in the sampling pipe above the sampling pipe inlet gate. The first purge inlet can be connected to a nitrogen gas source; the pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas delivery pipe.

10. The gas tight sampling device according to claim 1, characterized in that, in A second purge gate is also installed in the sample gas return pipe outside the sample gas return control valve, and the second purge gate can be connected to a nitrogen gas source; the pressure of the nitrogen gas source is greater than the pressure of the associated gas in the associated gas delivery pipeline; the sample gas return pipe is a flexible pipe.

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