An explosion-proof liquid level monitor

Abstract

The utility model discloses an anti -explosion type liquid level monitor relates to liquid level detection device technical field, include: box, test pipeline, detector, drive pump and controller, the inside first chamber and second chamber of mutual independence of box are provided, and test pipeline and detector all install in the first chamber, and drive pump and controller all install in the second chamber, and drive pump and detector all are electrically connected with controller, and drive pump is linked together with test pipeline, realized the isolation of gas circuit and circuit, avoided the problem that the electric spark of circuit produces and explodes the combustible gas in gas circuit, improved the security of liquid level monitor, meets the requirement of anti -explosion structure, and all structures are installed in the box of integrated setting, improved the convenience and reliability when the device uses.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid level detection devices, and in particular to an explosion-proof liquid level monitoring instrument. Background Technology

[0002] With the gradual rollout of digital oilfields, the traditional method of manually testing oil well fluid levels will be gradually replaced by automated monitoring equipment. Oilfield pumping unit production sites contain environments where explosive gases mix with air, falling under Zone 1 and Zone 2 of explosion-proof areas. The petrochemical industry is a key focus for on-site safety management, and all instruments and equipment installed on-site must meet explosion-proof requirements.

[0003] Currently, the automatic liquid level instruments used on-site are of varying quality, with different explosion-proof designs. For example, one method involves placing all components together in a metal explosion-proof enclosure. In the event of an explosion, the enclosure can isolate the impact of the explosion on the construction site. However, this method cannot prevent explosions from occurring at the source. Another method involves installing the gas circuit at the wellhead and the electrical circuit outside the hazardous area of ​​the well site, with the gas circuit and electrical circuit connected by pipelines and cables. However, this separate structure requires on-site trenching and wiring, making construction complex and resulting in a high product failure rate. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof liquid level monitor. The test pipeline is located in the first chamber, and the drive pump and controller are located in the second chamber, which realizes the isolation of the gas path and the electrical path, meets the explosion-proof requirements, and ensures the convenience of construction.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides an explosion-proof liquid level monitoring instrument, comprising:

[0007] The housing has an independent first chamber and a second chamber inside.

[0008] A test pipeline is installed in the first chamber and is used to connect to the oil well and emit test gas;

[0009] A detector, which is installed in the first chamber, is used to receive test signals;

[0010] A drive pump and a controller are both installed in the second chamber. The drive pump and the detector are both electrically connected to the controller. The drive pump is connected to the test pipeline and is used to provide pressure to the test pipeline.

[0011] As one embodiment, it also includes an air intake pipe, which is disposed in the first chamber. The air intake end of the air intake pipe is used to connect to the oil well, the air outlet end of the air intake pipe is connected to the air inlet of the drive pump, and the air outlet of the drive pump is connected to the air intake end of the test pipe.

[0012] As one embodiment, it also includes a gas-liquid separator, which is disposed between the air inlet pipe and the drive pump. The air outlet of the air inlet pipe is connected to the air inlet at the bottom of the gas-liquid separator, and the air inlet of the drive pump is connected to the air outlet at the top of the gas-liquid separator.

[0013] As one embodiment, it also includes an intake valve, which is installed on the intake pipe and electrically connected to the controller, which is used to control the intermittent opening and closing of the intake valve.

[0014] As one embodiment, the drive pump is a two-stage plunger pump.

[0015] As one embodiment, it also includes a gas storage tank, which is disposed in the first chamber. The outlet of the driving pump is connected to the inlet of the gas storage tank, and the inlet of the test pipeline is connected to the outlet of the gas storage tank.

[0016] As one embodiment, it also includes a first sensor and a second sensor. The first sensor is installed in the first chamber and is used to detect the pressure in the oil well. The second sensor is installed on the gas storage tank and is used to detect the pressure in the gas storage tank. Both the first sensor and the second sensor are connected to the controller.

[0017] As one embodiment, the air intake end of the air intake pipe is provided with a filter.

[0018] As one embodiment, a test valve is provided on the test pipeline to control the on / off state of the test pipeline.

[0019] As one embodiment, it also includes a connecting pipe, which is installed outside the first chamber. The outer wall of the connecting pipe is threaded to the wellhead casing of the oil well. The test pipeline is connected to the oil well through the connecting pipe, and a pressure relief valve is provided on the connecting pipe.

[0020] The present invention achieves the following technical advantages over the prior art:

[0021] In the explosion-proof liquid level monitor disclosed in this utility model, the test pipeline is used to emit test gas into the oil well, and the detector is used to receive the test signal to calculate the liquid level height in the oil well. The test pipeline is installed in the first chamber, and the drive pump and controller are installed in the second chamber. The first chamber and the second chamber are independent of each other, thereby achieving isolation between the gas path and the circuit, avoiding the problem of electric sparks generated in the circuit igniting flammable gas in the gas path, improving the safety of the liquid level monitor, meeting the requirements of explosion-proof structure, and all structures are installed in an integrated box, improving the convenience and reliability of the device during use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the explosion-proof liquid level monitor in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structural layout of the explosion-proof liquid level monitor in this embodiment of the present invention;

[0025] The components are as follows: 1. Housing; 2. First chamber; 3. Second chamber; 4. Test pipeline; 5. Detector; 6. Drive pump; 7. Controller; 8. Inlet pipeline; 9. Gas-liquid separator; 10. Intake valve; 11. Gas storage tank; 12. First sensor; 13. Second sensor; 14. Filter; 15. Test valve; 16. Connecting pipe; 17. Pressure relief valve; 18. First guide plate; 19. Second guide plate; 20. Permanent magnet DC motor; 21. Power module; 22. Communication interface; 23. Power interface; 24. First cover; 25. Second cover; 26. EX explosion-proof mark; 27. Explosion-proof sign; 28. Partition. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The purpose of this invention is to provide an explosion-proof liquid level monitor to solve the problems existing in the prior art. By separating the circuit and the gas path through the first chamber and the second chamber, the device meets the explosion-proof requirements.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Please refer to Figures 1-2 The explosion-proof liquid level monitor disclosed in this embodiment of the present invention includes: a housing 1, a test pipeline 4, a detector 5, a drive pump 6, and a controller 7; wherein, the housing 1 is provided with an independent first chamber 2 and a second chamber 3, the test pipeline 4 and the detector 5 are both installed in the first chamber 2, the test pipeline 4 is used to connect to the oil well and emit test gas, and the detector 5 is used to receive test signals, the drive pump 6 and the controller 7 are both installed in the second chamber 3, the drive pump 6 and the detector 5 are both electrically connected to the controller 7, the drive pump 6 is connected to the test pipeline 4, and the drive pump 6 is used to supply power to the test pipeline 4. The system provides pressure; its working principle is as follows: the pressure provided by the driving pump 6 allows the test pipeline 4 to release high-pressure test gas into the oil well. After the test gas enters the oil well, it generates a test pulse sound wave that propagates forward downhole within the wellbore. This sound wave is reflected when it encounters the oil-water interface downhole. The reflected sound wave signal is collected by the detector 5 as a test signal. The controller 7 receives the data collected by the detector 5 and calculates the time difference between the sound wave emission and return to obtain the distance between the downhole oil-water interface and the wellhead where the instrument is installed, i.e., the depth of the downhole fluid level from the wellhead. This completes one fluid level depth test process. The first chamber 2 and the second chamber 3 achieve isolation between the gas path and the circuit, avoiding the problem of electric sparks generated in the circuit igniting flammable gases in the gas path, meeting explosion-proof requirements, and improving the safety of the device. Furthermore, all components are installed in the housing 1, improving the integration level of the device and making it more convenient and reliable to use.

[0030] It is understood that the mutual independence mentioned in this utility model refers to physical independence, that is, the two chambers are not directly connected. Specifically, the gas in the first chamber 2 cannot enter the second chamber 3, and the electric spark in the second chamber 3 cannot be transmitted to the first chamber 2. As for the structure 2 in the first chamber and the structure in the second chamber 3, they can be connected by opening holes in the side walls between the two chambers. Of course, the opening position needs to be sealed and insulated while ensuring that the structures in the two chambers can be connected to each other.

[0031] In this embodiment, a partition 28 is provided inside the housing 1. The partition 28 is sealed to the inner wall of the housing 1 on all four sides, thereby isolating the internal space of the housing 1 into a first chamber 2 and a second chamber 3. The partition 28 is provided with through holes for pipes and / or wires to pass through. After the pipes and / or wires pass through, the through hole positions are sealed and insulated to meet the explosion-proof requirements.

[0032] Furthermore, the through holes on the partition 28 near the first housing 1 are sealed and insulated via a gas circuit box cable introduction device. The through holes on the partition 28 near the second housing 1 are sealed and insulated via a circuit box cable introduction device.

[0033] In this embodiment, the through holes on the partition plate 28 are equipped with cable filler, sealing ring, metal pressure plate and clamping element that meet the explosion-proof requirements.

[0034] In this embodiment, the explosion-proof liquid level monitor also includes an air inlet pipe 8, which is disposed within the first chamber 2. The air inlet end of the air inlet pipe 8 is connected to the oil well, and the air outlet end of the air inlet pipe 8 is connected to the air inlet of the drive pump 6. The air outlet of the drive pump 6 is connected to the air inlet end of the test pipe 4. The airflow in the oil well can enter the test pipe 4 through the air inlet pipe 8, and under the action of the drive pump 6, it re-enters the oil well as test gas. This method of directly extracting airflow from the oil well on-site eliminates the need for an external air source, reduces consumable costs and transportation risks, and also minimizes the impact on the original atmosphere inside the oil well.

[0035] In this embodiment, a gas-liquid separator 9 is also included, which is installed within the second chamber 3. The gas-liquid separator 9 is positioned between the inlet pipe 8 and the drive pump 6. The outlet of the inlet pipe 8 is connected to the inlet at the bottom of the gas-liquid separator 9, and the inlet of the drive pump 6 is connected to the outlet at the top of the gas-liquid separator 9. The gas flow extracted from the oil well often carries crude oil droplets and condensate water. Directly entering the gas path would clog the pipes or valves, causing the pulse signal to weaken or fail. The gas-liquid separator 9 effectively separates the gas flow into liquid. The liquid settles at the bottom of the gas-liquid separator 9, and the gas flows downstream from the outlet at the top of the gas-liquid separator 9, ensuring the stable operation of the device.

[0036] In this embodiment, a first guide plate 18 and a second guide plate 19 are provided inside the gas-liquid separator 9. The air inlet of the gas-liquid separator 9 is located on the side wall of the gas-liquid separator 9. The first guide plate 18 is located above the air inlet of the gas-liquid separator 9. At least two first guide plates 18 are provided, which are spaced apart. The second guide plate 19 is located on the side wall of the gas-liquid separator 9 opposite to the first guide plate 18. The first guide plate 18 and the second guide plate 19 are spaced apart in the vertical direction. The first guide plate 18 and the second guide plate 19 can extend the flow path of the airflow, allowing the tiny droplets to settle for a longer time. When the airflow hits the guide plate, the denser droplets will collide with the plate surface and coalesce due to inertia, so that the airflow can be fully separated into gas and liquid in the gas-liquid separator 9.

[0037] In this embodiment, the explosion-proof liquid level monitor also includes an air intake valve 10, which is installed on the air intake pipe 8. The air intake valve 10 is electrically connected to the controller 7. Under the action of the controller 7, the air intake valve 10 can be intermittently opened or closed, so that the gas flow drawn from the oil well forms a pulsed air flow and enters the gas-liquid separator 9, thereby promoting gas-liquid separation.

[0038] In this embodiment, the drive pump 6 is a two-stage plunger pump.

[0039] Furthermore, the explosion-proof liquid level monitor also includes a permanent magnet DC motor 20. The output shaft of the permanent magnet DC motor 20 is directly connected to the secondary plunger pump. The permanent magnet DC motor 20 is connected to the controller 7. The controller 7 can control the working state of the permanent magnet motor, thereby controlling the working state of the secondary plunger pump.

[0040] In this embodiment, the explosion-proof liquid level monitor also includes a gas storage tank 11, which is located in the first chamber 2. The outlet of the drive pump 6 is connected to the inlet of the gas storage tank 11, and the inlet of the test pipeline 4 is connected to the outlet of the gas storage tank 11. The gas storage tank 11 can store a certain amount of high-pressure gas, eliminating the need to wait for real-time pumping and ensuring that high-pressure gas can be released into the oil well immediately when measurement is required, thus achieving rapid and continuous measurement.

[0041] In this embodiment, the explosion-proof liquid level monitor also includes a first sensor 12 and a second sensor 13. The first sensor 12 is installed in the first chamber 2, and the second sensor 13 is installed on the gas storage tank 11. Both the first sensor 12 and the second sensor 13 are connected to the controller 7. The first sensor 12 can measure the pressure in the oil well, and the second sensor 13 can measure the pressure in the gas storage tank 11. In actual use, the pressure in the gas storage tank 11 should be 0.5 MPa higher than the pressure in the oil well. When the controller 7 detects that the pressure in the gas storage tank 11 is insufficient, it starts the drive pump 6 to work and increase the pressure in the gas storage tank 11.

[0042] In this embodiment, a filter 14 is provided at the air inlet end of the air inlet pipe 8. The filter 14 can filter out particulate matter in the gas extracted from the oil well.

[0043] In this embodiment, a test valve 15 is provided on the test pipeline 4 to control the opening and closing of the test pipeline 4. The test valve 15 can open or close the gas outlet of the gas storage tank 11.

[0044] In this embodiment, the explosion-proof liquid level monitor also includes a connecting pipe 16. The connecting pipe 16 is installed on the outside of the first chamber 2, and its outer wall is threaded to the wellhead casing of the oil well. The test pipeline 4 is connected to the oil well through the connecting pipe 16. A pressure relief valve 17 is provided on the connecting pipe 16. The threaded connection has the advantages of being detachable and stable, improving the flexibility of the device during use. Specifically, a through hole is provided on the side wall of the housing 1 located within the axial projection of the connecting pipe 16, and the test pipeline 4 is connected to the connecting pipe 16 through this through hole.

[0045] In this embodiment, the side wall of the housing 1 located within the axial projection of the connecting pipe 16 is also provided with a through hole for the first sensor 12 to communicate with the connecting pipe 16, a through hole for the detector 5 to communicate with the connecting pipe 16, and a through hole for the air intake pipe 8 to communicate with the connecting pipe 16.

[0046] Furthermore, the through holes on the side wall of the enclosure 1 are equipped with cable fillers, sealing rings, metal pressure plates, and clamping elements that meet explosion-proof requirements. The cable fillers, sealing rings, metal pressure plates, and clamping elements are all existing technologies and will not be described in detail here.

[0047] In this embodiment, a power module 21 is provided inside the second housing 1, and the controller 7 is electrically connected to the power module 21.

[0048] In this embodiment, a communication interface 22 is provided on the second housing 1, and the controller 7 is connected to an external terminal through a cable passing through the communication interface 22.

[0049] In this embodiment, a power interface 23 is provided on the second housing 1, and the power module 21 is connected to an external power source through a cable passing through the power interface 23.

[0050] In this embodiment, the explosion-proof liquid level monitor also includes a first cover 24 and a second cover 25, an opening at the top of the housing 1, the first cover 24 being detachably installed above the first cavity by means of bolts, and the second cover 25 being detachably installed above the second cavity by means of bolts.

[0051] In this embodiment, an EX explosion-proof mark 26 is installed on the first cover 24, and an explosion-proof sign 27 is installed on the second cover 25.

[0052] In this embodiment, the detector 5, the intake valve 10, the first sensor 12, the second sensor 13, and the test valve 15 are all standard parts that meet explosion-proof requirements.

[0053] In this embodiment, the controller 7 is the control center of the explosion-proof liquid level monitor, containing a microcomputer control circuit and AI intelligent embedded software. When the controller 7 receives a test command via the communication interface 22, it detects the pressure inside the oil well using the first sensor 12. Based on the pressure inside the well, it sets the required pressure value for the gas storage tank 11. The pressure value set for the gas storage tank 11 must be at least 0.5 MPa higher than the pressure detected by the first sensor 12 to generate the positive pulse sound wave required for the test. Then, the controller 7 starts the permanent magnet DC motor 20, driving the secondary plunger pump to reciprocate, compressing the gas flowing into the intake pipe 8. The high-pressure gas generated after compression by the secondary piston enters the gas storage tank 11. When the secondary plunger pump is working, the pump's intake air comes from the oil well being tested. First, it passes through filter 14 to remove solid particles, and then passes through the intake pipe to one end of the intake valve 10. Under the control of the controller 7, the intake valve 10 is intermittently opened and closed, so that the intake air forms a pulsating airflow that enters the gas-liquid separator 9. The pulsating airflow in the gas-liquid separator 9 adopts a bottom-in, top-out approach, and is fully separated into gas and liquid by the first guide plate 18 and the second guide plate 19. The gas after gas-liquid separation enters the secondary plunger pump. As the secondary plunger pump runs, the pressure in the gas storage tank 11 gradually increases. When the controller 7 detects through the second sensor 13 that the pressure in the gas storage tank 11 has reached the set pressure value, it stops the permanent magnet DC motor 20 and the secondary plunger pump, and at the same time closes the intake valve 10. The controller 7 opens the test valve 15, releasing the high-pressure gas in the gas storage tank 11 into the oil well through the test pipeline 4 and the connecting pipe 16. Due to the high pressure in the oil well caused by the released gas storage tank 11, a test pulse sound wave is generated in the wellbore and propagates in the forward direction downhole. This sound wave is reflected when it encounters the oil-water interface downhole. The reflected sound wave signal is collected by the detector 5. The controller 7 receives the data collected by the detector 5 and calculates the time difference between the sound wave emission and return to obtain the distance between the downhole oil-water interface and the wellhead where the instrument is installed, that is, the depth of the downhole fluid surface from the wellhead. This completes one fluid surface depth test process.

[0054] It is understood that: in the embodiment shown in the attached figure, the first chamber and the second chamber are arranged side by side, with the lid on top; for other forms, such as: the first chamber and the second chamber are arranged front to back, the first chamber and the second chamber are arranged vertically, and the corresponding first and second lids can be provided on both sides or vertically, these structures are all within the scope of protection of this utility model.

[0055] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An explosion-proof liquid level monitor, characterized in that, include: The box (1) has a first chamber (2) and a second chamber (3) that are independent of each other. Test pipeline (4), which is installed in the first chamber (2), is used to connect to the oil well and emit test gas; Detector (5), which is installed in the first chamber (2), is used to receive test signals; A drive pump (6) and a controller (7) are installed in the second chamber (3). The drive pump (6) and the detector (5) are electrically connected to the controller (7). The drive pump (6) is connected to the test line (4). The drive pump (6) is used to provide pressure to the test line (4).

2. The explosion-proof liquid level monitor according to claim 1, characterized in that, It also includes an air intake pipe (8), which is installed in the first chamber (2). The air intake end of the air intake pipe (8) is used to connect with the oil well, the air outlet end of the air intake pipe (8) is connected with the air inlet of the drive pump (6), and the air outlet of the drive pump (6) is connected with the air intake end of the test pipe (4).

3. The explosion-proof liquid level monitor according to claim 2, characterized in that, It also includes a gas-liquid separator (9), which is located between the air inlet pipe (8) and the drive pump (6). The air outlet of the air inlet pipe (8) is connected to the air inlet at the bottom of the gas-liquid separator (9), and the air inlet of the drive pump (6) is connected to the air outlet at the top of the gas-liquid separator (9).

4. The explosion-proof liquid level monitor according to claim 3, characterized in that, It also includes an intake valve (10), which is installed on the intake pipe (8). The intake valve (10) is electrically connected to the controller (7), which is used to control the intermittent opening and closing of the intake valve (10).

5. The explosion-proof liquid level monitor according to claim 2, characterized in that, The drive pump (6) is a two-stage plunger pump.

6. The explosion-proof liquid level monitor according to claim 2, characterized in that, It also includes a gas storage tank (11), which is located in the first chamber (2). The outlet of the drive pump (6) is connected to the inlet of the gas storage tank (11), and the inlet of the test pipeline (4) is connected to the outlet of the gas storage tank (11).

7. The explosion-proof liquid level monitor according to claim 6, characterized in that, It also includes a first sensor (12) and a second sensor (13). The first sensor (12) is installed in the first chamber (2) and is used to detect the pressure in the oil well. The second sensor (13) is installed on the gas storage tank (11) and is used to detect the pressure in the gas storage tank (11). Both the first sensor (12) and the second sensor (13) are connected to the controller (7).

8. The explosion-proof liquid level monitor according to claim 2, characterized in that, The intake end of the intake pipe (8) is equipped with a filter (14).

9. The explosion-proof liquid level monitor according to claim 1, characterized in that, The test pipeline (4) is equipped with a test valve (15) for controlling the opening and closing of the test pipeline (4).

10. The explosion-proof liquid level monitor according to claim 1, characterized in that, It also includes a connecting pipe (16), which is installed on the outside of the first chamber (2). The outer wall of the connecting pipe (16) is threaded to the wellhead casing of the oil well. The test pipeline (4) is connected to the oil well through the connecting pipe (16). A pressure relief valve (17) is provided on the connecting pipe (16).

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