An on-line detecting device for hydrogen sulfide concentration in oil well

Abstract

This invention discloses an online detection device for hydrogen sulfide concentration in oil wells, specifically relating to the field of chemical detection technology. The invention comprises a collection box, a sealing device, a convex panel, and an isolation plate. When gas enters the inclined tube along the circulation pipe, the condensed liquid drips into the collection box under gravity, thereby detecting the hydrogen sulfide concentration in the gas. This allows the device to effectively separate the condensed liquid and gas during use, avoiding inaccurate readings due to gas-liquid mixing. After the hydrogen sulfide concentration detection is complete, the device can be disassembled, allowing the isolation plate to fall naturally under gravity. The liquid in the collection box then leaks out through the first and second leakage holes, preventing liquid accumulation inside the device and thus ensuring the accuracy of the hydrogen sulfide concentration detection data.

Description

Technical Field

[0001] This invention relates to the field of chemical detection technology, and more specifically, to an online detection device for hydrogen sulfide concentration in oil wells. Background Technology

[0002] When drilling and excavating oil wells, it is often necessary to test the content of gas components inside the well to determine whether construction is underway. Currently, when testing the hydrogen sulfide concentration inside oil wells, a hydrogen sulfide concentration detector is often connected to a pipeline, and the hydrogen sulfide concentration is measured by observing the detector after the connection is completed.

[0003] The hydrogen sulfide concentration detector uses solid metal oxide semiconductor sensing technology. The sensor consists of two thin plates: one is a heating plate, and the other is a gas-sensitive plate that is sensitive to hydrogen sulfide gas. Both plates are mounted on a silicon chip by vacuum coating. The heating plate raises the operating temperature of the gas-sensitive plate to a level that can react to hydrogen sulfide gas. The gas-sensitive plate has metal oxides on it, which can dynamically display changes in the concentration of hydrogen sulfide gas.

[0004] Chinese patent document (CN107957481B) discloses a hydrogen sulfide concentration detection device. The specification states that "in oilfields, when recording hydrogen sulfide content at oil wells, the hydrogen sulfide tester is aligned with the 4-point gate at the well's gas collection process, and then the 4-point gate is opened to allow the hydrogen sulfide-containing mixed gas to contact the tester, directly reading the value on the instrument. This testing method has the following main problems:"

[0005] (1) After the mixed gas containing hydrogen sulfide comes out of the 4-point gate, it mixes with the air, causing the recorded values ​​to be inaccurate, especially when recorded in a windy environment, the accuracy drops significantly.

[0006] (2) When reading the values ​​on the detector, the operator is too close to the detector, which can easily cause hydrogen sulfide poisoning in the operator;

[0007] (3) During the test, the operator must always point the hydrogen sulfide tester at the 4-point gate, which is too labor-intensive;

[0008] The device detects hydrogen sulfide concentration in a semi-enclosed environment, and the mixed gas after detection is directly released into the atmosphere, which can easily lead to inaccurate hydrogen sulfide concentration detection and the risk of poisoning of testing personnel.

[0009] Meanwhile, Chinese patent document (CN108318550B) discloses a detection device and method for hydrogen sulfide in liquid oil products. The specification states that "hydrogen sulfide is the simplest of the sulfur hydrides. At room temperature, H2S is a colorless, highly toxic gas with a rotten egg odor. It should be used in well-ventilated areas with necessary protective measures. It is an inhalation health hazard, a strong neurotoxin, and has a strong irritant effect on mucous membranes. Low concentrations are easily detected, but high concentrations can dull the sense of smell. At a concentration of 150 ppm, the sense of smell can be lost within 2-5 minutes, and if not removed promptly, it can be fatal. Hydrogen sulfide is widely present in crude oil and petroleum products. The hydrogen sulfide in crude oil is inherent to the product itself, while the hydrogen sulfide in petroleum products includes not only that present in the raw materials but also that produced as a byproduct during production. Therefore, for safety and environmental protection, it is necessary to accurately determine the hydrogen sulfide content in crude oil and petroleum products and effectively remove it to reduce its concentration to below safe levels."

[0010] Due to the complexity of production and the diversity of products, sulfur-containing substances in oil products include many types, and the types and contents of sulfides vary among different types of oil products. Generally, these include elemental sulfur, hydrogen sulfide, thiols, thioethers, polysulfides, cyclic thioethers, and thiophenes. Existing methods for determining hydrogen sulfide include: iodometric titration, methylene blue titration, lead acetate reaction rate titration, gas chromatography, and the tube length ratio method. Iodometric titration is a classic chemical analysis method that allows for different hydrogen sulfide sample amounts and a wide measurement range. However, it is relatively complex to operate, requires manual operation, and has poor repeatability and low accuracy, making it suitable for relatively pure gases. The methylene blue titration method has a narrower range of applicability, from 0 to 25 mg·m⁻³, and is more suitable for purified natural gas with relatively stable hydrogen sulfide concentrations. While column chromatography provides relatively accurate results, it places high demands on detectors, standard gases, and sampling techniques, and requires specialized gas chromatographs, resulting in a high investment. The tube length ratio method also suffers from the same problems as the iodometric titration method. Most existing hydrogen sulfide detection methods are for gaseous hydrogen sulfide, and most are not suitable for detecting hydrogen sulfide in liquids. Even with modifications to remove the hydrogen sulfide, sulfur-containing impurities in complex samples can significantly interfere with detection. Therefore, finding a simple and rapid way to detect hydrogen sulfide in the liquid phase, eliminating interference from various impurities, especially in complex liquid samples, has always been a focus of method development and instrument research. However, the above example does not completely solve the problem of gas-liquid separation during hydrogen sulfide concentration detection. Liquid accumulation or flow inside the hydrogen sulfide detector not only affects the accuracy of the data but also increases the risk of instrument damage. Therefore, compared with existing hydrogen sulfide concentration detectors and the apparatus described in the cited comparative case, the following problems still exist:

[0011] (1) Currently, the concentration of hydrogen sulfide in oil wells is determined by detecting the gas extracted from the well. However, in actual detection, hydrogen sulfide and other gases will condense due to temperature difference and pressure after being extracted from the well to the surface. At this time, it is necessary to discharge the condensed liquid. However, the existing hydrogen sulfide concentration detection device has a single function, which means that it can only collect the condensed liquid. This results in a large amount of liquid accumulating inside the hydrogen sulfide detector, and it is difficult to discharge it in time, thus affecting the detection effect of the instrument on the concentration of hydrogen sulfide.

[0012] (2) Underground oil wells often contain a large amount of waste debris and dense solid impurities, which can easily cause blockages in hydrogen sulfide concentration detection devices. This not only affects the accuracy of hydrogen sulfide concentration detection, but also easily damages the hydrogen sulfide detection devices. Summary of the Invention

[0013] To overcome the aforementioned deficiencies of the prior art, the present invention provides an online detection device for hydrogen sulfide concentration in oil wells. The technical problem to be solved by the present invention is that the existing hydrogen sulfide concentration detection devices can only collect the condensed liquid, resulting in a large amount of liquid accumulating inside the hydrogen sulfide detector, and it is difficult to discharge it in a timely manner, thereby affecting the detection effect of the instrument on hydrogen sulfide concentration.

[0014] To achieve the above objectives, the present invention provides the following technical solution: an online detection device for hydrogen sulfide concentration in oil wells, comprising a hydrogen sulfide concentration detector, a first detection tube fixedly connected to the lower outer side of the hydrogen sulfide concentration detector, the first detection tube being located below the hydrogen sulfide concentration detector, the bottom end of the first detection tube being connected to the top end of a second detection tube, a sealing device fixedly connected inside the second detection tube, an isolation plate and a feed plate fixedly connected inside the sealing device, the inner wall of the sealing device being fixedly connected to a circulation pipe via a bracket, and the bottom end of the sealing device being fixedly connected to the top end of a collection hood.

[0015] The sealing device includes a sealing tube, the top end of which is fixedly connected to the top end of the inner wall of the second detection tube, the bottom end of which is fixedly connected to the bottom end of the third detection tube, the third detection tube being fixedly connected to the circulation tube via a bracket, the inner wall of the third detection tube being fixedly connected to an isolation plate and a feed plate respectively, the shapes of the isolation plate and the feed plate being adapted to the shape of the inner wall of the third detection tube, and the bottom end of the third detection tube being fixedly connected to the top end of the collection hood.

[0016] A corresponding convex panel is fixedly connected to the isolation plate, and a telescopic device is fixedly connected to the convex panel. The top end of the telescopic device is fixedly connected to the bottom end of the circulation pipe, and the other end of the circulation pipe is fixedly connected to the tap. The convex panel is connected to two inclined pipes through the circulation pipe and the tap, and the opposite ends of the two inclined pipes are connected to the tap, and the other ends of the two taps are connected to two collection boxes.

[0017] As a further aspect of the present invention: an air outlet pipe is fixedly connected to the collection box, the collection box is connected to the third detection pipe through the air outlet pipe, and an air hole is opened at the bottom of the collection box, the shape of the air hole at the bottom of the collection box being adapted to the shape of the snap-fit ​​device.

[0018] As a further aspect of the present invention: the bottom ends of the two snap-fit ​​devices are fixedly connected to the convex panel, and the positions of the two snap-fit ​​devices correspond to the positions of the two collection boxes respectively.

[0019] As a further aspect of the present invention: the snap-fit ​​device includes a sealing sheet, the shape of which is adapted to the shape of the air hole opened under the collection box, the position of which corresponds to the position of the collection box, and a support column is fixedly connected under the sealing sheet, the bottom end of which is fixedly connected to the convex panel.

[0020] As a further aspect of the present invention: a plurality of first leakage holes are provided under the isolation plate, the isolation plate is connected to the third detection tube through the first leakage holes, and a plurality of second leakage holes are provided on the inner wall of the third detection tube.

[0021] As a further aspect of the present invention: the feed plate and a plurality of second leakage holes are at the same level, and the top of both the convex panel and the feed plate is conical.

[0022] As a further aspect of the present invention: the telescopic device includes a sliding sleeve, the bottom end of which is fixedly connected to a convex panel, the protective sleeve is connected to the convex panel, a sliding tube is slidably connected inside the sliding sleeve, and the top end of the sliding tube is connected to one end of the circulation tube.

[0023] As a further aspect of the present invention: the collection cover has a plurality of ventilation holes, and each ventilation hole is fixedly connected with a filter screen plate, the shape of the filter screen plate corresponding to the shape of the ventilation hole.

[0024] As a further aspect of the present invention: a plurality of cleaning scrapers are snapped onto the outside of the collection cover, and one side of each of the plurality of cleaning scrapers overlaps with the collection cover, and the plurality of cleaning scrapers are fixedly connected by reinforcing rings.

[0025] As a further embodiment of the present invention: a bearing is snapped into the bottom end of the collection cover, a rotating shaft is sleeved inside the bearing, a positioning block is fixedly connected to the outside of the rotating shaft, and several cleaning scrapers are connected to the rotating shaft through the positioning block.

[0026] As a further embodiment of the present invention: a rotating device is fixedly connected to the bottom end of the rotating shaft, and a collection plate is fixedly connected to the outside of several cleaning scrapers, and a collection groove is opened in the collection plate.

[0027] As a further aspect of the present invention: the rotating device includes a fixed block, which is fixedly connected to the bottom end of the rotating shaft, and a plurality of fan blades are fixedly connected to the outside of the fixed block.

[0028] As a further aspect of the present invention: the second detection tube is fitted with an outer mounting cylinder, and the inner wall of the outer mounting cylinder is threaded.

[0029] As a further aspect of the present invention: a sealing ring is fixedly connected inside the mounting outer cylinder, the sealing ring being located between the mounting outer cylinder and the second detection tube; two extrusion plates are fixedly connected inside the mounting outer cylinder, and the opposing surfaces of the two extrusion plates are fixedly connected by an extrusion rod; both extrusion plates and the extrusion rod are located between the mounting outer cylinder and the second detection tube.

[0030] As a further aspect of the present invention: the hydrogen sulfide concentration detector is provided with two connectors, and the two connectors are respectively located on both sides of the hydrogen sulfide concentration detector; the front of the hydrogen sulfide concentration detector is provided with a display panel.

[0031] The beneficial effects of this invention are as follows:

[0032] (1) By setting up a collection box, a sealing device, a telescopic device, a convex panel and an isolation plate, when the gas enters the inclined tube along the circulation pipe, the condensed liquid will drip into the collection box under the action of gravity, and the gas will be discharged into the hydrogen sulfide concentration detector along the outlet pipe, the third detection tube and the second detection tube, thereby detecting the hydrogen sulfide concentration in the gas. This allows the detection device to effectively separate the condensed liquid and gas during use, avoiding inaccurate values ​​due to gas-liquid mixing. After the detection device has finished detecting the hydrogen sulfide concentration, it is only necessary to disassemble the detection device so that the isolation plate falls naturally under the action of gravity. At this time, the liquid in the collection box will leak out along the first and second leakage holes, preventing the liquid from accumulating inside the detection device, thus ensuring the detection data of hydrogen sulfide concentration in the detection device.

[0033] (2) By setting up a collection cover, a filter plate, a cleaning scraper and a rotating device, the present invention requires the hydrogen sulfide concentration detector to be tested by the gas discharged from the detection port after the hydrogen sulfide concentration detector is installed. Before entering the hydrogen sulfide concentration detector, the gas passes through the ventilation holes on the surface of the collection cover, so that the gas is filtered by the filter plate when it enters the collection cover and the third detection tube. Large debris and solid impurities contained in the gas are blocked outside the filter plate, avoiding the residue of impurities on the surface of the filter plate. This ensures that the cleaning scraper can continuously clean the filter plate during the use of the detection device. Under the action of centrifugal force during rotation, the impurities cleaned are retained inside the collection plate, preventing them from adhering to the surface of the filter plate again. This ensures the smooth flow of the internal parts of the detection device during use, avoids the blockage of the hydrogen sulfide concentration detector during the detection process, ensures the accuracy of the hydrogen sulfide concentration detection, and improves the service life of the detection device.

[0034] (3) By setting a sealing ring and a squeezing plate, the detection port will contact the squeezing plate and push the squeezing plate to move up during the downward movement of the detection device. At this time, the squeezing plate will squeeze the sealing ring. The sealing ring will gradually deform and seal the gap between the outer cylinder and the second detection tube. This allows the detection device to seal the gap inside after installation, avoiding gas leakage during the detection of hydrogen sulfide concentration, and thus ensuring the accuracy of the data when the detection device detects hydrogen sulfide concentration. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0036] Figure 2 This is a three-dimensional structural schematic diagram of the hydrogen sulfide concentration detector of the present invention;

[0037] Figure 3 This is a three-dimensional cross-sectional structural diagram of the outer cylinder of the present invention;

[0038] Figure 4 This is a three-dimensional cross-sectional structural diagram of the second detection tube of the present invention;

[0039] Figure 5 This is a three-dimensional cross-sectional structural diagram of the third detection tube of the present invention;

[0040] Figure 6 This is a three-dimensional structural diagram of the collection cover of the present invention;

[0041] In the diagram: 1 Hydrogen sulfide concentration detector, 2 First detection tube, 3 Second detection tube, 4 Sealing device, 41 Sealing tube, 42 Third detection tube, 5 Isolation plate, 6 Convex panel, 7 Telescopic device, 71 Sliding sleeve, 72 Sliding tube, 8 Circulation tube, 9 Tape, 10 Inclined tube, 11 Collection box, 12 Vent pipe, 13 Clip-on device, 131 Sealing plate, 132 Support column, 14 First leakage hole, 15 Second leakage hole, 16 Feed plate, 17 Collection cover, 18 Vent hole, 19 Filter screen, 20 Cleaning scraper, 21 Collection clamping plate, 22 Reinforcing ring, 23 Bearing, 24 Rotating shaft, 25 Rotating device, 251 Fixing block, 252 Fan blade, 26 Mounting outer cylinder, 27 Thread, 28 Sealing ring, 29 Extrusion plate, 30 Extrusion rod, 31 Connector, 32 Display panel. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figure 1-6 As shown, the present invention provides an online detection device for hydrogen sulfide concentration in oil wells, including a hydrogen sulfide concentration detector 1. A first detection tube 2 is fixedly connected to the lower part of the hydrogen sulfide concentration detector 1. The first detection tube 2 is located below the hydrogen sulfide concentration detector 1. Two connectors 31 are provided on the outside of the hydrogen sulfide concentration detector 1, and the two connectors 31 are respectively located on both sides of the hydrogen sulfide concentration detector 1. A display panel 32 is provided on the front of the hydrogen sulfide concentration detector 1. Because of the display panel 32, when detecting the concentration of hydrogen sulfide through this detection device, it is only necessary to observe the display panel 32, thereby reducing the difficulty of using the detection device.

[0044] The bottom end of the first detection tube 2 is connected to the top end of the second detection tube 3. The second detection tube 3 is clamped to the outside of the mounting outer cylinder 26. The inner wall of the mounting outer cylinder 26 is threaded with 27. A sealing ring 28 is fixedly connected inside the mounting outer cylinder 26. The sealing ring 28 is located between the mounting outer cylinder 26 and the second detection tube 3. Two extrusion plates 29 are fixedly connected inside the mounting outer cylinder 26, and the opposite faces of the two extrusion plates 29 are fixedly connected by an extrusion rod 30. The two extrusion plates 29 and the extrusion rod 30 are all located between the mounting outer cylinder 26 and the second detection tube 3. Because of the sealing ring 28 and the extrusion plates 29, the internal gaps of the detection device can be sealed after installation, avoiding gas leakage during the detection of hydrogen sulfide concentration, thereby ensuring the accuracy of the data when the detection device detects hydrogen sulfide concentration.

[0045] A sealing device 4 is fixedly connected inside the second detection tube 3. An isolation plate 5 and a feed plate 16 are fixedly connected inside the sealing device 4. Several first leakage holes 14 are opened under the isolation plate 5. The isolation plate 5 is connected to the third detection tube 42 through the first leakage holes 14. Several second leakage holes 15 are opened on the inner wall of the third detection tube 42. The feed plate 16 and the several second leakage holes 15 are at the same level. The top of the convex plate 6 and the feed plate 16 are both conical. After the detection device has completed the detection of hydrogen sulfide concentration, it is only necessary to disassemble the detection device so that the isolation plate 5 falls naturally under the action of gravity. Since the top of the convex plate 6 and the feed plate 16 are both conical, the liquid will fall along the inclined surface of the cone to the first leakage holes 14 and the second leakage holes 15, ensuring the efficiency of liquid discharge of the detection device.

[0046] The inner wall of the sealing device 4 is fixedly connected to the circulation pipe 8 by a bracket, and the bottom end of the sealing device 4 is fixedly connected to the top end of the collection hood 17. Because of the circulation pipe 8, the gas will gradually condense when it flows along the circulation pipe 8, ensuring that the condensable part of the gas can be stably condensed into liquid before entering the hydrogen sulfide.

[0047] The sealing device 4 includes a sealing tube 41. The top end of the sealing tube 41 is fixedly connected to the top end of the inner wall of the second detection tube 3. The bottom end of the sealing tube 41 is fixedly connected to the bottom end of the third detection tube 42. The third detection tube 42 is fixedly connected to the circulation tube 8 through a bracket. The inner wall of the third detection tube 42 is fixedly connected to the isolation plate 5 and the feed plate 16 respectively. The shapes of the isolation plate 5 and the feed plate 16 are adapted to the shape of the inner wall of the third detection tube 42. The bottom end of the third detection tube 42 is fixedly connected to the top end of the collection cover 17.

[0048] The collection cover 17 has several vent holes 18 on its exterior, and each vent hole 18 has a filter screen 19 fixedly connected to it. The shape of the filter screen 19 corresponds to the shape of the vent holes 18. Several cleaning scrapers 20 are snapped onto the outside of the collection cover 17, and one side of each cleaning scraper 20 overlaps with the collection cover 17. The cleaning scrapers 20 are fixedly connected by a reinforcing ring 22. A bearing 23 is snapped onto the bottom of the collection cover 17, and a rotating shaft 24 is sleeved inside the bearing 23. A positioning device is fixedly connected to the outside of the rotating shaft 24. A block, several cleaning scrapers 20 are connected to the rotating shaft 24 via a positioning block. A rotating device 25 is fixedly connected to the bottom end of the rotating shaft 24. Each of the cleaning scrapers 20 is fixedly connected to a collection plate 21. A collection groove is opened in the collection plate 21. Because of the collection plate 21, the impurities cleaned off during rotation will be retained inside the collection plate 21 under the action of centrifugal force, preventing the cleaned off impurities from adhering to the surface of the filter screen 19 again, thereby ensuring the treatment effect of the cleaning scraper 20 on the filter screen 19.

[0049] The rotating device 25 includes a fixed block 251, which is fixedly connected to the bottom end of the rotating shaft 24. Several fan blades 252 are fixedly connected to the outside of the fixed block 251. The presence of fan blades 252, rotating shaft 24 and cleaning scraper 20 ensures the smooth flow of the internal components of the detection device during use, preventing blockages in the hydrogen sulfide concentration detector 1 during the detection process. It also ensures the accuracy of the hydrogen sulfide concentration detector 1 in detecting hydrogen sulfide concentration and improves the service life of the detection device.

[0050] A corresponding convex panel 6 is fixedly connected to the isolation plate 5. A telescopic device 7 is fixedly connected to the convex panel 6. The top end of the telescopic device 7 is fixedly connected to the bottom end of the circulation pipe 8. The telescopic device 7 includes a sliding sleeve 71. The bottom end of the sliding sleeve 71 is fixedly connected to the convex panel 6. The sleeve is connected to the convex panel 6. A sliding tube 72 is slidably connected inside the sliding sleeve 71. The top end of the sliding tube 72 is connected to the corresponding end of the circulation pipe 8. Because of the sliding sleeve 71 and the sliding tube 72, the isolation plate 5 can always be in communication with the circulation pipe 8 through the sliding tube 72 and the sliding sleeve 71 when it moves up and down, so as to avoid the connection of the circulation pipe 8 being broken due to the movement of the isolation plate 5.

[0051] The other end of the circulation pipe 8 is fixedly connected to the tap 9. The convex panel 6 is connected to two inclined pipes 10 through the circulation pipe 8 and the tap 9 respectively. The bottom ends of two snap-fit ​​devices 13 are fixedly connected to the convex panel 6, and the positions of the two snap-fit ​​devices 13 correspond to the positions of the two collection boxes 11 respectively. The snap-fit ​​device 13 includes a sealing plate 131. The shape of the sealing plate 131 is adapted to the shape of the air hole opened under the collection box 11. The position of the sealing plate 131 corresponds to the position of the collection box 11. A support column 132 is fixedly connected under the sealing plate 131. The bottom end of the support column 132 is fixedly connected to the convex panel 6. Because of the sealing plate 131, after the detection device has completed the detection of hydrogen sulfide concentration, it is only necessary to disassemble the detection device so that the isolation plate 5 falls naturally under the action of gravity. At this time, the collection box 11 will separate from the sealing plate 131, so that the liquid in the collection box 11 will leak out along the first leakage hole 14 and the second leakage hole 15, avoiding the accumulation of liquid inside the detection device.

[0052] Furthermore, one end of each of the two inclined tubes 10 is connected to the tap 9, and the other end of each of the two taps 9 is connected to the two collection boxes 11 respectively. An air outlet pipe 12 is fixedly connected to the collection box 11, and the collection box 11 is connected to the third detection tube 42 through the air outlet pipe 12. An air hole is opened at the bottom of the collection box 11, and the shape of the air hole at the bottom of the collection box 11 is adapted to the shape of the snap-fit ​​device 13.

[0053] Working principle of this invention:

[0054] When the hydrogen sulfide concentration detector 1 is required, it needs to be installed at the designated detection port of the oil well. The second detection tube 3 is inserted into the designated detection port, and then the outer cylinder 26 is rotated forward. The outer cylinder 26 is connected to the detection port through the thread 27 inside, so that the outer cylinder 26 is fixed during the downward movement of the detection device. During the downward movement of the detection device, the detection port will contact the extrusion plate 29 and push the extrusion plate 29 upward. At this time, the extrusion plate 29 will extrude the sealing ring 28. The sealing ring 28 gradually deforms and seals the gap between the outer cylinder 26 and the second detection tube 3.

[0055] After the hydrogen sulfide concentration detector 1 is installed, the hydrogen sulfide concentration needs to be detected by the gas discharged through the detection port. The pressure generated when the gas inside the oil well is extracted causes the gas inside the oil well to rush into the hydrogen sulfide concentration detector 1. As the gas flows, the fan blade 252 will gradually rotate as the gas rushes in. Before entering the hydrogen sulfide concentration detector 1, the gas will pass through the vent 18 on the surface of the collection cover 17. When the gas enters the collection cover 17 and the third detection tube 42, it will be filtered by the filter screen 19. Large debris and solid impurities contained in the gas will be blocked outside the filter screen 19. As the fan blade 252 rotates, it will drive the cleaning scraper 20 to rotate through the rotating shaft 24, so that the cleaning scraper 20 cleans the filter screen 19 in real time.

[0056] When gas enters the area above the isolation plate 5 through the feed plate 16 along the collection hood 17, the gas pressure pushes the isolation plate 5 upward. At the same time, the gas enters the telescopic device 7 and the circulation pipe 8 along the convex panel 6 connected above the isolation plate 5. As the isolation plate 5 moves upward, it causes the two sealing plates 131 to be inserted into the collection box 11, making the collection box 11 sealed. When the gas enters the inclined tube 10 along the circulation pipe 8, the condensed liquid drips into the collection box 11 under the action of gravity. The gas is discharged into the hydrogen sulfide concentration detector 1 along the outlet pipe 12, the third detection pipe 42, and the second detection pipe 3, thereby detecting the hydrogen sulfide concentration in the gas. After the detection device has completed the detection of the hydrogen sulfide concentration, it can be disassembled to allow the isolation plate 5 to fall naturally under the action of gravity. At this time, the liquid in the collection box 11 will leak out along the first leakage hole 14 and the second leakage hole 15.

[0057] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0058] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0059] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. An on-line device for detecting hydrogen sulfide concentration in oil well, comprising a hydrogen sulfide concentration detector (1), characterized in that: The hydrogen sulfide concentration detector (1) is fixedly connected to the lower outer side of a first detection tube (2). The bottom end of the first detection tube (2) is connected to the top end of a second detection tube (3). A sealing device (4) is fixedly connected inside the second detection tube (3). An isolation plate (5) and a feed plate (16) are fixedly connected inside the sealing device (4). The inner wall of the sealing device (4) is fixedly connected to a circulation pipe (8) through a bracket. The bottom end of the sealing device (4) is fixedly connected to the top end of a collection hood (17). The sealing device (4) includes a sealing tube (41), the top end of which is fixedly connected to the top end of the inner wall of the second detection tube (3), the bottom end of which is fixedly connected to the bottom end of the third detection tube (42), the third detection tube (42) is fixedly connected to the circulation tube (8) through a bracket, the inner wall of the third detection tube (42) is fixedly connected to the isolation plate (5) and the feed plate (16) respectively, the shapes of the isolation plate (5) and the feed plate (16) are adapted to the shape of the inner wall of the third detection tube (42), and the bottom end of the third detection tube (42) is fixedly connected to the top end of the collection cover (17).

2. The device for on-line detecting the concentration of hydrogen sulfide in oil well according to claim 1, characterized in that: The isolation plate (5) is fixedly connected to a corresponding convex plate (6), and the convex plate (6) is fixedly connected to a telescopic device (7). The top end of the telescopic device (7) is fixedly connected to the bottom end of the circulation pipe (8), and the other end of the circulation pipe (8) is fixedly connected to the tap (9). The convex plate (6) is connected to two inclined pipes (10) through the circulation pipe (8) and the tap (9), and the opposite ends of the two inclined pipes (10) are connected to the tap (9), and the other ends of the two taps (9) are connected to two collection boxes (11).

3. The device for on-line detecting the concentration of hydrogen sulfide in oil well according to claim 2, characterized in that: An air outlet pipe (12) is fixedly connected to the collection box (11). The collection box (11) is connected to the third detection pipe (42) through the air outlet pipe (12). An air hole is opened under the collection box (11). The shape of the air hole under the collection box (11) is adapted to the shape of the snap-fit ​​device (13).

4. The online detection device for hydrogen sulfide concentration in oil wells according to claim 3, characterized in that: The bottom ends of the two snap-fit ​​devices (13) are fixedly connected to the convex panel (6), and the positions of the two snap-fit ​​devices (13) correspond to the positions of the two collection boxes (11).

5. The on-line device for detecting the concentration of hydrogen sulfide in oil well according to claim 4, characterized in that: The snap-fit ​​device (13) includes a sealing plate (131), the shape of which is adapted to the shape of the air hole opened under the collection box (11), the position of which corresponds to the position of the collection box (11), and a support column (132) is fixedly connected under the sealing plate (131), the bottom end of which is fixedly connected to the convex panel (6).

6. The on-line device for detecting concentration of hydrogen sulfide in oil well according to claim 1, characterized in that: The isolation plate (5) has several first leakage holes (14) at the bottom. The isolation plate (5) is connected to the third detection tube (42) through the first leakage holes (14). The inner wall of the third detection tube (42) has several second leakage holes (15).

7. The online detection device for hydrogen sulfide concentration in oil wells according to claim 3, characterized in that: The feed plate (16) and several second drain holes (15) are at the same level, and the top of the convex panel (6) and the feed plate (16) are both conical.

8. The on-line device for detecting concentration of hydrogen sulfide in oil well according to claim 3, characterized in that: The telescopic device (7) includes a sliding sleeve (71), the bottom end of which is fixedly connected to the convex panel (6), the sliding sleeve (71) is connected to the convex panel (6), and a sliding tube (72) is slidably connected inside the sliding sleeve (71), the top end of which is connected to the end of the circulation tube (8).

9. The online detection device for hydrogen sulfide concentration in oil wells according to claim 1, characterized in that: The collection cover (17) has several ventilation holes (18) on its outside, and each ventilation hole (18) is fixedly connected with a filter screen (19). The shape of the filter screen (19) corresponds to the shape of the ventilation hole (18).

10. The on-line device for detecting the concentration of hydrogen sulfide in oil well according to claim 9, characterized in that: The collection cover (17) is fitted with several cleaning scrapers (20), and one side of each of the cleaning scrapers (20) overlaps with the collection cover (17). The cleaning scrapers (20) are fixedly connected by a reinforcing ring (22).

11. The on-line device for detecting the concentration of hydrogen sulfide in oil well according to claim 10, characterized in that: The bottom end of the collection cover (17) is fitted with a bearing (23), and a rotating shaft (24) is sleeved inside the bearing (23). A positioning block is fixedly connected to the outside of the rotating shaft (24), and several cleaning scrapers (20) are connected to the rotating shaft (24) through the positioning block.

12. The online detection device for hydrogen sulfide concentration in oil wells according to claim 11, characterized in that: The bottom end of the rotating shaft (24) is fixedly connected to a rotating device (25), and a collection plate (21) is fixedly connected to the outside of several cleaning scrapers (20), and a collection groove is opened in the collection plate (21).

13. The online detection device for hydrogen sulfide concentration in oil wells according to claim 12, characterized in that: The rotating device (25) includes a fixed block (251), which is fixedly connected to the bottom end of the rotating shaft (24), and a number of fan blades (252) are fixedly connected to the outside of the fixed block (251).

14. The online detection device for hydrogen sulfide concentration in oil wells according to claim 1, characterized in that: The second detection tube (3) is fitted with an outer mounting cylinder (26), and the inner wall of the outer mounting cylinder (26) is threaded (27).

15. The on-line device for detecting the concentration of hydrogen sulfide in oil well according to claim 14, characterized in that: A sealing ring (28) is fixedly connected inside the mounting outer cylinder (26). The sealing ring (28) is located between the mounting outer cylinder (26) and the second detection tube (3). Two extrusion plates (29) are fixedly connected inside the mounting outer cylinder (26), and the opposite surfaces of the two extrusion plates (29) are fixedly connected by an extrusion rod (30). The two extrusion plates (29) and the extrusion rod (30) are both located between the mounting outer cylinder (26) and the second detection tube (3).

16. The on-line device for detecting concentration of hydrogen sulfide in oil well according to claim 1, characterized in that: The hydrogen sulfide concentration detector (1) is provided with two connectors (31), and the two connectors (31) are located on both sides of the hydrogen sulfide concentration detector (1). The front of the hydrogen sulfide concentration detector (1) is provided with a display panel (32).

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