A shale gas platform gas well integrated agent filling device

Abstract

The utility model discloses a shale gas platform gas well integration medicament filling device belongs to oil and gas exploitation technical field. The device includes the liquid tank, the clean water tank, the mixed liquid tank and the electric control box, and the liquid tank corresponds with the mixed liquid tank one to one, and the clean water tank can correspond a plurality of mixed liquid tanks. Each tank body is connected through the pipeline with pump, valve, check valve, and the mixed liquid tank is equipped with electric stirrer and two stage filter, and the medicament pipeline is divided into multiple branches, and all executing components are controlled by electric control box PLC controller, and the tank body is all equipped with magnetic flap liquid level meter. The device realizes the linkage of multiple medicaments and fills, solves the long cycle of traditional manual filling, low precision problem, and the double filtration and anti -backflow design guarantee the stability of equipment, support remote and in -situ intelligent control, have liquid level, pressure alarm and interlocking shutdown function, adapt to multi -well exploitation, improve medicament filling efficiency, safety and intelligent level, reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction technology, and more specifically to an integrated reagent injection device for shale gas platform gas wells. Background Technology

[0002] During shale gas extraction, as the recovery rate of the gas reservoir gradually increases, production problems such as reservoir water lock, well water production, wellbore fluid accumulation, and pipeline corrosion become increasingly prominent. To ensure stable gas well production and improve recovery rate, it is necessary to precisely inject various functional agents such as water-locking agents, foaming agents, corrosion inhibitors, and defoamers into the gas well and surface processes to achieve auxiliary production goals such as unblocking, drainage, and corrosion prevention.

[0003] Currently, the industry commonly uses manual vehicle-mounted pump injection for chemical injection, where chemicals are transported to the site via vehicle-mounted equipment and then manually injected into the wellbore by operating the pump. This traditional method has several technical drawbacks: First, it cannot meet the needs of coordinated injection of multiple chemicals, requiring separate injections of different chemicals, resulting in a fragmented process; second, the injection volume accuracy under manual control is insufficient, easily leading to chemical waste or substandard injection volumes, affecting auxiliary production; third, the operation process is cumbersome, requiring significant manpower, and the injection cycle is long and inefficient; fourth, it lacks remote control capabilities, making it impossible to achieve unmanned operation and real-time control, and thus difficult to adapt to the development trend of large-scale and intelligent shale gas platform exploitation.

[0004] The aforementioned problems severely restrict the efficient implementation of shale gas well enhancement and drainage technologies, reducing the stability and economic efficiency of gas well production. Therefore, developing an integrated, intelligent, and high-precision integrated reagent injection device for shale gas platform gas wells has become an urgent need to address the pain points of existing technologies and improve the efficiency of shale gas extraction. Utility Model Content

[0005] In order to overcome the defects and shortcomings of the prior art, the present invention provides an integrated reagent injection device for shale gas platforms. The purpose of this invention is to solve the problems of long injection cycles, cumbersome injection processes, and inability to perform coordinated injection of reagents such as foaming agents, defoaming agents, corrosion inhibitors, and water-dissolving agents in the current shale gas well extraction process.

[0006] To address the problems existing in the prior art, this utility model is achieved through the following technical solution.

[0007] This utility model provides an integrated reagent injection device for shale gas platform gas wells, including... The system includes at least one raw material tank for holding the reagents, at least one clean water tank for holding clean water, at least one mixing tank for mixing the reagents pumped from the raw material tank with the clean water pumped from the clean water tank, and an electrical control box. The number of raw material tanks is determined according to the types of reagents required for shale gas extraction, and the mixing tanks correspond one-to-one with the raw material tanks. The outlet of the raw material tank is connected to the reagent inlet of the mixing tank via a reagent pumping pipeline, and a reagent pump is installed on the reagent pumping pipeline. The outlet of the clean water tank is connected to the clean water inlet of the mixing tank via a clean water pumping pipeline, and a clean water pump is installed on the clean water pumping pipeline. The outlet of the mixing tank is connected to an injection pipeline, and an injection pump is installed on the injection pipeline. The reagent pump, clean water pump, and injection pump are all electrically connected to the electrical control box, and the start and stop of each pump are controlled by a PLC controller in the electrical control box.

[0008] A further preferred embodiment is that one clear water tank corresponds to multiple mixing tanks.

[0009] More preferably, the pumped drug pipeline is equipped with a drug electric valve for controlling the on / off state of the pumped drug pipeline. The drug electric valve is electrically connected to the electrical control box, and the opening and closing of the drug electric valve is controlled by the PLC controller in the electrical control box.

[0010] More preferably, the pumped drug pipeline is also equipped with a drug check valve to prevent the drug from flowing back to the original liquid tank.

[0011] In a further preferred embodiment, the pumped clean water pipeline is equipped with a clean water electric valve for controlling the on / off state of the pumped clean water pipeline. The clean water electric valve is electrically connected to the electrical control box, and the opening and closing of the clean water electric valve is controlled by the PLC controller in the electrical control box.

[0012] Furthermore, preferably, the pumping clean water pipeline is also equipped with a clean water check valve to prevent clean water from flowing back to the clean water tank.

[0013] More preferably, each of the raw liquid tank, the clear water tank, and the mixed liquid tank is equipped with a magnetic float level gauge, and each magnetic float level gauge is electrically connected to the electrical control box to transmit the liquid level signal to the PLC controller of the electrical control box.

[0014] More preferably, the water tank has a water inlet at the top and a drain outlet at the bottom, with a rotary valve at the drain outlet.

[0015] More preferably, the top of the stock solution tank is provided with a dosing port, the bottom is provided with a drain port, and a rotary valve is provided at the drain port.

[0016] More preferably, the mixing tank is equipped with an electric stirrer, which is electrically connected to the electrical control box. The PLC controller of the electrical control box controls the electric stirrer to stir synchronously when the reagent and water are pumped into the mixing tank.

[0017] More preferably, a primary filter is provided at the outlet of the mixing tank, and a secondary filter is connected in series on the injection pipeline, with the secondary filter connected in series on the injection pipeline before the injection pump.

[0018] Even more preferably, a ball valve is connected in series on the injection line between the primary filter and the secondary filter.

[0019] In a further preferred embodiment, the injection pipeline after the injection pump is connected in parallel to form several injection branch pipelines. Each injection branch pipeline is equipped with an electric ball valve and a check valve connected in series. The electric ball valve is electrically connected to the electrical control box, and the opening and closing of the electric ball valve is controlled by the PLC controller in the electrical control box.

[0020] More preferably, the injection pump is an electric plunger pump, which is acid and corrosion resistant, has a rated voltage of 380V, and a rated displacement of 100L / h.

[0021] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model, through the aforementioned modular and intelligent technical solution design, achieves a comprehensive breakthrough in addressing the core pain points of existing manual vehicle-mounted pump injection methods, significantly improving the efficiency, accuracy, safety, and intelligence level of reagent injection on shale gas platforms. Specific technical effects are as follows: 1. Through a one-to-one configuration design of raw liquid tanks and mixing tanks, the number of raw liquid tanks can be flexibly set according to the different types of agents such as water-locking agents, foaming agents, and corrosion inhibitors required for shale gas extraction. Each raw liquid tank supplies the corresponding mixing tank through an independent pumping agent pipeline. At the same time, with the optimized layout of one clear water tank corresponding to multiple mixing tanks (when the required amount of clear water is large, two clear water tanks can be corresponding to multiple mixing tanks, setting up a one-to-one correspondence between clear water tanks and mixing tanks), it can not only meet the needs of simultaneous supply of multiple agents, but also reduce the redundant configuration of clear water tanks, thereby reducing equipment costs and floor space.

[0022] 2. Fluid transport between each raw liquid tank, clear water tank and mixed liquid tank is uniformly scheduled by the PLC controller in the electrical control box. The coordinated start and stop of the chemical pump, clear water pump and electric valve can accurately match the injection sequence of different chemicals, completely solving the problem of process fragmentation caused by traditional manual injection in multiple stages, realizing multi-chemical linkage injection, and greatly shortening the overall injection cycle.

[0023] 3. The stock solution tank, clear water tank, and mixing tank are all equipped with magnetic level gauges, which transmit the liquid level signal to the PLC controller in real time. The controller can accurately control the start and stop time of the reagent pump and clear water pump according to the preset reagent dilution ratio, ensuring that the amount of reagent and clear water pumped into the mixing tank each time strictly meets the process requirements. At the same time, the electric stirrer in the mixing tank starts synchronously during the liquid supply process, ensuring that the reagent and clear water are mixed evenly without sedimentation, avoiding local reagent concentration deviations caused by uneven mixing.

[0024] 4. The injection pump adopts a plunger injection pump with a rated displacement of 100L / h, which has both acid and corrosion resistance and stable displacement output. With the independent electric ball valve control of the injection branch pipeline, the injection dosage of a single well can be accurately adjusted according to the agent requirements of different gas wells, avoiding the problems of "over-injection is wasteful and under-injection is ineffective" under traditional manual control, and improving agent utilization efficiency and production enhancement and drainage effect.

[0025] 5. The primary filter at the outlet of the mixing tank and the secondary filter before the injection pump form a "dual filtration" system, which can intercept impurities in the agent step by step (such as residual impurities in the original solution and tiny particles generated during the mixing process). At the same time, the ball valve between the primary and secondary filters can disconnect the corresponding pipeline separately when the filter needs to be cleaned or replaced, without affecting the overall injection process. Dual filtration effectively prevents impurities from entering the injection pump or gas well pipeline, reduces pump wear and pipeline blockage risks, and extends equipment service life.

[0026] 6. The check valves for the pumped chemical pipeline, the clean water pipeline, and the injection branch pipeline can respectively prevent the backflow of chemical to the concentrate tank, clean water to the clean water tank, and mixed chemical to the injection pump, avoiding reverse flow of fluid due to pipeline pressure fluctuations, preventing media contamination between different tanks, and protecting core components such as the chemical pump and clean water pump from reverse pressure impacts.

[0027] 7. The PLC controller in the electrical control box can centrally control all actuators such as the chemical pump, water pump, injection pump, electric agitator, and various electric valves. It supports dual modes of "local control + remote control": local control can display key parameters such as liquid level, pump pressure, and discharge rate in real time; remote control can adjust the opening of the electric ball valve and set the pump start and stop time through the network terminal, realizing unmanned operation, greatly reducing manual operation procedures, and reducing labor costs and on-site operation risks.

[0028] 8. Based on the real-time liquid level signal of the magnetic float level gauge and the pump pressure monitoring (implied in the PLC control logic), the system can automatically trigger low liquid level alarms (such as insufficient medicine in the raw material tank or insufficient water in the clean water tank) and high pressure alarms (such as a sudden pressure rise caused by pipeline blockage), and link to start the interlocking shutdown function. The low liquid level / high pressure interlock of each pump is only associated with itself, avoiding the shutdown of the entire system due to a single fault. At the same time, this interlocking function can be remotely shut down, which facilitates fault diagnosis and flexible scheduling in emergency situations, and improves the safety and reliability of equipment operation.

[0029] 9. The injection pipeline is designed with parallel branches to form multiple injection branches. Each branch can be independently connected to different gas wells. "One pump for multiple injections" can be achieved through the individual control of the branch electric ball valve. There is no need to configure independent injection equipment for a single gas well, which greatly improves the equipment utilization rate and is suitable for the scenario of concentrated production of multiple wells on shale gas platforms.

[0030] 10. The drain port and rotary valve design at the bottom of the raw liquid tank and clean water tank can periodically discharge the impurities deposited in the tank, avoiding media contamination that affects the performance of the reagents; the acid and corrosion resistant characteristics of the plunger injection pump can adapt to the transportation needs of various chemical reagents in shale gas extraction. The equipment has strong adaptability and can be promoted and applied in shale gas platforms with different geological conditions. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the integrated drug dispensing device of this utility model; Attached reference numerals: 1. Stock solution tank; 2. Clean water tank; 3. Mixed solution tank; 4. Electrical control box; 5. Chemical pumping line; 6. Chemical pump; 7. Clean water pumping line; 8. Clean water pump; 9. Injection line; 10. Injection pump; 11. Chemical electric valve; 12. Chemical check valve; 13. Clean water electric valve; 14. Clean water check valve; 15. Magnetic level gauge; 16. Water inlet; 17. Drain outlet; 18. Chemical inlet; 19. Rotary valve; 20. Electric stirrer; 21. Primary filter; 22. Secondary filter; 23. Ball valve; 24. Injection branch line; 25. Electric ball valve; 26. Check valve. Detailed Implementation

[0032] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Example 1 As a preferred embodiment of this utility model, please refer to the appendix to the specification. Figure 1 As shown, this embodiment provides an integrated reagent injection device for shale gas platform gas wells, including... The system includes two stock solution tanks 1 for holding the chemicals, one clean water tank 2 for holding clean water, two mixing tanks 3 for mixing the chemicals pumped from stock solution tanks 1 with the clean water pumped from clean water tanks 2, and an electrical control box 4. One stock solution tank 1 contains a foaming agent, and the other stock solution tank 1 contains a dehydrating agent. The mixing tanks 3 correspond one-to-one with the stock solution tanks 1. The outlet of the stock solution tank 1 is connected to the inlet of the mixing tank 3 via a chemical pumping pipeline 5. A medicine pump 6 is installed on the medicine pumping pipeline 5; the outlet of the clear water tank 2 is connected to the clear water inlet of the mixing tank 3 through the clear water pumping pipeline 7, and a clear water pump 8 is installed on the clear water pumping pipeline 7; the outlet of the mixing tank 3 is connected to the injection pipeline 9, and an injection pump 10 is installed on the injection pipeline 9. The medicine pump 6, the clear water pump 8 and the injection pump 10 are all electrically connected to the electrical control box 4, and the start and stop of each pump are controlled by the PLC controller in the electrical control box 4.

[0034] The electrical control box 4 can control the dosage of the medicine locally and / or remotely (depending on the operating conditions). It can individually control the start and stop of each pump and calculate the real-time discharge of the injection pump 10.

[0035] Example 2 As another preferred embodiment of this utility model, this embodiment is a further detailed supplement and explanation of the technical solution of this utility model based on the above-described embodiment 1. (Refer to the appendix of the specification.) Figure 1 As shown, generally speaking, one clear water tank 2 corresponds to multiple mixing tanks 3. When the demand for clear water is large, multiple clear water tanks 2 can be configured.

[0036] The pumping agent pipeline 5 is equipped with a chemical electric valve 11 to control the on / off state of the pumping agent pipeline 5. The chemical electric valve 11 is electrically connected to the electrical control box 4, and its opening and closing are controlled by the PLC controller in the electrical control box 4. The pumping agent pipeline 5 is also equipped with a chemical check valve 12 to prevent the agent from flowing back to the original liquid tank 1. The pumping clean water pipeline 7 is equipped with a clean water electric valve 13 to control the on / off state of the pumping clean water pipeline 7. The clean water electric valve 13 is electrically connected to the electrical control box 4, and its opening and closing are controlled by the PLC controller in the electrical control box 4. The pumping clean water pipeline 7 is also equipped with a clean water check valve 14 to prevent clean water from flowing back to the clean water tank 2. The raw material tank 1, the clear water tank 2, and the mixing tank 3 are all equipped with magnetic level gauges 15, which are electrically connected to the electrical control box 4 to transmit the liquid level signal to the PLC controller of the electrical control box 4. The clear water tank 2 has a water inlet 16 at the top and a drain outlet 17 at the bottom, with a rotary valve 19 at the drain outlet 17. The raw material tank 1 has a chemical inlet 18 at the top and a drain outlet 17 at the bottom, with a rotary valve 19 at the drain outlet 17. The mixing tank 3 is equipped with an electric stirrer 20, which is electrically connected to the electrical control box 4. The PLC controller of the electrical control box 4 controls the electric stirrer 20 to simultaneously stir the mixture when the chemical and clear water are pumped into the mixing tank 3. A primary filter 21 is installed at the outlet of the mixing tank 3. A secondary filter 22 is connected in series on the injection line 9, which is connected in series on the injection line 9 before the injection pump 10. A ball valve 23 is connected in series on the injection line 9 between the primary filter 21 and the secondary filter 22. The injection line 9 after the injection pump 10 is connected in parallel to several injection branch lines 24. Each injection branch line 24 is connected in series with an electric ball valve 25 and a check valve 26. The electric ball valve 25 is electrically connected to the electrical control box 4, and its opening and closing are controlled by the PLC controller in the electrical control box 4. The injection pump 10 is an electric plunger pump, which is acid and corrosion resistant, with a rated voltage of 380V and a rated discharge of 100L / h.

[0037] Example 3 As another preferred embodiment of this utility model, this embodiment is a further detailed supplement and description based on the above-described Embodiment 1 or Embodiment 2. In this embodiment, an integrated reagent injection device for shale gas platform gas wells is provided to solve the problems of long reagent injection cycles, inaccurate injection volumes, cumbersome personnel operation procedures, and inability to remotely control reagents during the current foam drainage gas production process for natural gas wells. (Refer to the attached specification.) Figure 1 As shown, the integrated chemical injection device for the shale gas platform gas well includes two raw material tanks 1, one clean water tank 2, two mixing tanks 3, an electrical control box 4, an injection pump 10, a chemical pump 6, and a clean water pump 8. The original liquid tank 1 is located above the mixing tank 3. A drain port 17 is provided at the bottom of the tank to discharge the drug sediment. When the drug in the tank is insufficient, it can be replenished through the top drug filling port 18. The tank is equipped with a magnetic float level gauge 15, which can be viewed on-site or remotely controlled by the network (electric control box 4). The outlet connected to the side of the original liquid tank 1 controls the drug to flow into the mixing tank 3 through the drug pumping pipeline 5 via the drug check valve 12. At the same time as the drug is added, the stirrer on the mixing tank 3 stirs synchronously to ensure that the drug in the dilution tank is mixed evenly and without precipitation. The clear water tank 2 is located on the right side of the mixing tank 3, and a water inlet 16 is provided on the top. When the clear water in the tank is insufficient, it can be replenished through this inlet. The tank is equipped with a magnetic float level gauge 15, and the level of the clear water tank 2 can be viewed on-site or online. The outlet connected to the side of the clear water tank 2 is controlled by the clear water pump 8 to pump clear water from the clear water pipeline 7 to the inlet of the mixing tank 3 and flow into the mixing tank 3. The injection pump 10 is an electric plunger pump, which is acid and corrosion resistant. It is powered by a 380V explosion-proof motor with a rated pressure of 10MPa and a rated discharge of 100L / h. The pump inlet is connected to the outlet pipeline of the mixing tank 3, the filter, and the check valve 26. The pump can be controlled by the valve to select water or agents such as foaming agents, unblocking agents, and water-locking agents. The pump outlet pumps the agent mixture into the gas well and the surface process through the injection pipeline 9.

[0038] The electrical control box 4 is located on the side of the raw liquid tank 1. It can control the dosage of the agent locally and remotely. When controlling locally, it can also display the pump pressure and liquid level. The control box can control the start and stop of each pump and valve individually. At the same time, the system can calculate the real-time discharge of the injection pump 10. It can control the start and stop of the stirring motor of the electric stirrer 20. It has low liquid level and high pressure alarm functions, and low liquid level and high pressure interlock shutdown function. This function can be remotely turned off. The low liquid level and high pressure interlock of each pump is only associated with its related pump.

[0039] With the above structure, the integrated chemical injection device for shale gas platform gas wells provided by this utility model, when in use, firstly, connect the clean water tank to the water inlet 16 on the top of the clean water tank 2 with a hose, close the drain valve 17 of the clean water tank 2, turn on the vehicle-mounted pump to pump the clean water pump 8 into the clean water tank 2 for replenishment, observe the level gauge of the clean water tank 2 during the replenishment process, and close the water inlet 16 after the replenishment is completed. Then, connect the chemical concentrate tank to the chemical injection port 18 on the top of the concentrate tank 1 with a hose, close the drain valve 17 of the concentrate tank 1, turn on the vehicle-mounted pump to pump the chemical pump 6 into the concentrate tank 1 for replenishment, observe the level gauge of the concentrate tank 1 during the replenishment process, and close the chemical injection port 18 after the replenishment is completed. The outlet of the clean water tank 2 is opened via the electrical control box 4, allowing clean water to be pumped from the clean water pipeline 7 to the mixing tank 3. When the clean water reaches the required concentration, the clean water pump 8 is automatically shut off. Simultaneously, clean water is injected into the mixing tank 3, and the outlet of the original liquid tank 1 is opened, allowing the chemical pump 6 to pump the chemical into the mixing tank 3 via the chemical pumping pipeline 5. While adding clean water and chemicals, the electrical control box 4 automatically activates the electric stirrer 20 installed in the center of the mixing tank 3 for stirring. After reaching the required dilution ratio, the chemical pumping pipeline 5, the clean water pumping pipeline 7, and the stirrer are shut off. The injection volume for each gas well is set via the network terminal or the control panel of the electrical control box 4. The electrical control box 4 then opens the electric ball valve 25 on the injection pump 10 and the injection pipeline 9, sequentially injecting the chemical mixture into the gas wells. Completing these operations completes one chemical injection cycle. The electrical control box 4 can also be set to a time cycle mode to automatically start the next round of chemical injection. The entire operation is simple, the drug injection cycle is short, and the injection volume can be precisely controlled.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An integrated reagent injection device for shale gas platform gas wells, characterized in that: The system includes at least one raw material tank (1) for holding the reagent, at least one clean water tank (2) for holding clean water, at least one mixing tank (3) for mixing the reagent pumped from the raw material tank (1) with the clean water pumped from the clean water tank (2), and an electrical control box (4). The number of raw material tanks (1) is set according to the types of reagents required for shale gas extraction. The mixing tanks (3) correspond one-to-one with the raw material tanks (1). The outlet of the raw material tank (1) is connected to the inlet of the mixing tank (3) through a pumping reagent pipeline (5). A drug delivery pipeline (5) is equipped with a drug pump (6); the outlet of the clear water tank (2) is connected to the clear water inlet of the mixing tank (3) through a pumping clear water pipeline (7), and a clear water pump (8) is installed on the pumping clear water pipeline (7); the outlet of the mixing tank (3) is connected to the injection pipeline (9), and an injection pump (10) is installed on the injection pipeline (9). The drug pump (6), the clear water pump (8) and the injection pump (10) are all electrically connected to the electrical control box (4), and the start and stop of each pump are controlled by the PLC controller in the electrical control box (4).

2. The integrated reagent injection device for shale gas platform gas wells as described in claim 1, characterized in that: One clear water tank (2) corresponds to multiple mixing tanks (3).

3. The integrated reagent injection device for shale gas platform gas wells as described in claim 1, characterized in that: The pumping agent pipeline (5) is equipped with an electric agent valve (11) for controlling the opening and closing of the pumping agent pipeline (5). The electric agent valve (11) is electrically connected to the electrical control box (4), and the opening and closing of the electric agent valve (11) is controlled by the PLC controller in the electrical control box (4).

4. The integrated reagent injection device for shale gas platform gas wells as described in claim 3, characterized in that: The pumping agent pipeline (5) is also equipped with a check valve (12) to prevent the agent from flowing back to the original liquid tank (1).

5. The integrated reagent injection device for shale gas platform gas wells as described in claim 1, characterized in that: The pumping clean water pipeline (7) is equipped with a clean water electric valve (13) for controlling the opening and closing of the pumping clean water pipeline (7). The clean water electric valve (13) is electrically connected to the electrical control box (4), and the PLC controller in the electrical control box (4) controls the opening and closing of the clean water electric valve (13).

6. The integrated reagent injection device for shale gas platform gas wells as described in claim 5, characterized in that: The pumping clean water pipeline (7) is also equipped with a clean water check valve (14) to prevent clean water from flowing back to the clean water tank (2).

7. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: The original liquid tank (1), the clear water tank (2) and the mixed liquid tank (3) are all equipped with magnetic float level gauges (15). The magnetic float level gauges (15) are all electrically connected to the electrical control box (4) and transmit the liquid level signal to the PLC controller of the electrical control box (4).

8. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: The water tank (2) is provided with a water inlet (16) at the top and a drain outlet (17) at the bottom, and a rotary valve (19) is provided at the drain outlet (17).

9. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: The top of the raw liquid tank (1) is provided with a dosing port (18) and the bottom is provided with a drain port (17). A rotary valve (19) is provided at the drain port (17).

10. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: An electric stirrer (20) is installed in the mixing tank (3). The electric stirrer (20) is electrically connected to the electrical control box (4). The PLC controller of the electrical control box (4) controls the electric stirrer (20) to stir synchronously when the medicine and water are pumped into the mixing tank (3).

11. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: A primary filter (21) is installed at the outlet of the mixing tank (3), and a secondary filter (22) is connected in series on the injection line (9). The secondary filter (22) is connected in series on the injection line (9) before the injection pump (10).

12. The integrated reagent injection device for shale gas platform gas wells as described in claim 11, characterized in that: A ball valve (23) is connected in series on the injection line (9) between the primary filter (21) and the secondary filter (22).

13. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: The injection pipeline (9) after the injection pump (10) is connected in parallel to divide into several injection branch pipelines (24). Each injection branch pipeline (24) is connected in series with an electric ball valve (25) and a check valve (26). The electric ball valve (25) is electrically connected to the electrical control box (4), and the opening and closing of the electric ball valve (25) is controlled by the PLC controller in the electrical control box (4).

14. The integrated reagent injection device for shale gas platform gas wells as described in any one of claims 1-6, characterized in that: The injection pump (10) is an electric plunger pump, which is acid and corrosion resistant, rated voltage 380V, and rated displacement 100L / h.

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