Automatic foam scrubbing and filling device

Abstract

An automatic foam scrubbing and filling device belongs to the technical field of foam scrubbing and filling and comprises an agent box for storing a foam scrubbing agent, a storage box for storing an anti-freezing agent and a wellhead connecting cylinder connected with a shaft, and the agent box, the storage box and the wellhead connecting cylinder are connected through conveying pipelines. The problems that in the prior art, when the temperature is low, the foam scrubbing agent is prone to freezing in the conveying process through a conveying pipeline, smooth injection operation is hindered, impurities are not filtered and removed in the conveying process of the foam scrubbing agent, and the impurities are prone to being mixed in the foam scrubbing agent, and the foam scrubbing operation efficiency is affected can be solved; according to the invention, the problem that only on-site manual control can be realized and remote monitoring cannot be realized can be solved; the device can realize the functions of remote start and stop, flow regulation, pressure observation, liquid level alarm, low-level automatic stop, frequency conversion control and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of foam drainage addition, and particularly relates to an automatic foam drainage addition device. Background Art

[0002] During the process of natural gas production, wellbore liquid accumulation is a common problem, which seriously threatens the stable production of gas wells, causes a sharp drop in gas production, and in severe cases, even causes the gas well to be flooded by wellbore liquid and shut down, greatly reducing the recovery rate of gas wells. Therefore, during the production process, a foam drainage gas production process is adopted to remove wellbore liquid accumulation. The existing process is to add foam drainage agent at the wellhead. After the wellbore liquid contacts the foam drainage agent, a large amount of low-density foam is continuously generated under the agitation of the natural gas flow at the bottom of the well. The foam will carry the liquid accumulation from the bottom of the well to the ground along with the gas flow, so as to achieve the purpose of removing the wellbore liquid accumulation at the bottom of the well.

[0003] In the prior art, Patent CN202021170797.7 discloses a foam drainage agent addition device for improving the recovery rate of gas wells, which has a foaming agent storage chamber and an antifoaming agent storage chamber. The antifoaming agent and the foaming agent are combined quickly and simply, and at the same time, heating is provided for the agent, which is suitable for the foam drainage agent addition operation in winter in the north; Patent CN202122144663.9 provides a foam drainage agent addition device for natural gas wells, which can ensure the purity of the gas quality of the gas-liquid booster pump, stable pressure, safe exhaust, and can remind the staff to add the foaming agent into the foaming agent storage box in time, improving work efficiency. However, if the above patents are applied to the foam drainage agent addition operation in winter in the north, due to the low temperature, the foam drainage agent is prone to freeze during the transportation process through the pipeline, hindering the smooth progress of the addition operation, and the foam drainage agent is not filtered to remove impurities during the transportation process, and impurities are likely to be mixed in the foam drainage agent, affecting the efficiency of the foam drainage operation. Summary of the Invention

[0004] In order to solve the above existing problems, the present invention proposes: an automatic foam drainage addition device, including a chemical agent tank for storing foam drainage agent, a storage tank for storing antifreeze, and a wellhead connection cylinder connected to the wellbore. The chemical agent tank, the storage tank, and the wellhead connection cylinder are connected through a pipeline.

[0005] Further, the chemical agent tank and the storage tank have the same structure, and both have an outer box body and an inner box body.

[0006] Further, liquid level gauges are respectively arranged in the chemical agent tank and the storage tank.

[0007] Further, feeding structures are respectively arranged on the sides of the chemical agent tank and the storage tank. The top of the feeding structure is provided with a feeding port, and the feeding structure is communicated with the chemical agent tank and the storage tank through an inclined channel.

[0008] Further, a heating device is provided between the inner box body and the outer box body, and the inner box body is heated and insulated through the heating device.

[0009] Further, the heating device has a heat conducting plate and an electric heating wire. The heat conducting plate surrounds and closely adheres to the outside of the inner box body. Fixing blocks for fixing the tension springs are arranged on the heat conducting plate. The two sides of the heat conducting plate are connected by tension springs. The electric heating wire is arranged attached to the outer surface of the heat conducting plate.

[0010] Further, the conveying pipeline includes a first conveying pipeline, a second conveying pipeline and a third conveying pipeline. The bottom of the medicine tank is connected to the first conveying pipeline, and the bottom of the storage tank is connected to the second conveying pipeline. A preliminary filter plate and a filter are respectively arranged on the first conveying pipeline and the second conveying pipeline. The preliminary filter plate is arranged near the bottom of the outer box body. Solenoid valves are also respectively arranged on the first conveying pipeline and the second conveying pipeline. The solenoid valves are arranged between the preliminary filter plate and the outer box body. The filter is arranged on the side of the preliminary filter plate away from the outer box body.

[0011] The first conveying pipeline includes a front section pipeline and a rear section pipeline. The solenoid valve, the preliminary filter plate and the filter are arranged on the front section pipeline. A heat preservation cavity is arranged on the pipe wall of the front section pipeline. A hot air outlet is arranged below the outer box body of the medicine tank. The hot air outlet is communicated with the heat preservation cavity on the pipe wall of the front section pipeline through a connecting pipe. An injection pump is connected between the front section pipeline and the rear section pipeline. A safety valve and a check valve are installed on the rear section pipeline. An injection pump is also arranged on the second conveying pipeline.

[0012] The output end of the first conveying pipeline and the output end of the second conveying pipeline are respectively communicated with the input end of the third conveying pipeline. A pressure sensor, a temperature sensing device and a flow meter are installed on the third conveying pipeline. The output end of the third conveying pipeline is connected to the wellhead connection cylinder, and one end of the third conveying pipeline penetrates into the inside of the wellhead connection cylinder to the bottom of the wellhead connection cylinder. A check valve is arranged at one end of the third conveying pipeline close to the wellhead connection cylinder.

[0013] Further, the wellhead connection cylinder is connected to the wellhead of the wellbore through a flange.

[0014] Further, the heating device, the liquid level gauge, the solenoid valve, the safety valve, the injection pump, the pressure sensor, the temperature sensing device and the flow meter are all connected to the controller of the electric control box, and the controller is connected with an alarm device.

[0015] Furthermore, the controller is connected to a wireless remote control device at the background through a wireless communication unit to achieve remote control of the heating device, solenoid valve, safety valve, and injection pump. The measured values of the liquid level gauge, pressure sensor, temperature sensing device, and flow meter obtained by the controller are transmitted to the background through the wireless communication unit, and the background realizes remote monitoring of the values through a display device.

[0016] The beneficial effects of the present invention are as follows: The automatic foam drainage and injection device of the present invention can solve the problems in the prior art that when the temperature is relatively low, the foam drainage agent is prone to freezing during transportation through the pipeline, hindering the smooth progress of the injection operation, and the foam drainage agent is not filtered to remove impurities during transportation, and impurities are easily mixed in the foam drainage agent, affecting the efficiency of the foam drainage operation; it can solve the problem that it can only be manually controlled on-site and cannot be remotely monitored. The device can realize functions such as remote start and stop, flow rate adjustment, pressure observation, liquid level alarm, low-level automatic stop, and frequency conversion control.

[0017] The foam drainage agent and antifreeze first pass through a preliminary filter plate in the pipeline to preliminarily filter large-particle impurities, and then pass through a filter to filter small-particle impurities. Before injecting into the wellbore, the impurities in the foam drainage agent are filtered and removed to improve the efficiency of the foam drainage operation. The driving motor drives the opening and closing plate and the preliminary filter plate to rotate, and the preliminary filter plate can be rotated to the outside of the pipeline. Both the preliminary filter plate and the opening and closing plate are inclined, which is convenient for pouring out the impurities filtered on the preliminary filter plate, avoiding the cumbersome operation steps of manually removing the preliminary filter plate for cleaning, and improving the cleaning efficiency;

[0018] The heating device heats and keeps warm the chemical agent tank and the storage tank. The heating device conducts heat through a heat conduction plate, and the heat conduction plate is tightly attached to the inner box body to improve the heating effect;

[0019] The pipeline is heated and kept warm, and different sections of the pipeline are heated by different heating methods. The front section of the first pipeline is heated by the hot air between the outer box body and the inner box body of the chemical agent tank, making full use of the heat inside the outer box body. Since the front section of the pipeline is close to the chemical agent tank, the temperature drop is small, and the heat inside the outer box body can meet the heating requirements. The rear section of the first pipeline and the third pipeline are heated by electric heating wires to achieve heat preservation, and an antifreeze is added to the pipeline to ensure that the foam drainage agent will not freeze during transportation in case of low temperature, ensuring the smooth progress of the injection operation. An enhanced layer is arranged outside the heating layer of the first pipeline and the third pipeline. In the case of a cavity with a heating layer provided, the strength of the pipeline is guaranteed;

[0020] In the absence of power supply, it can be powered by its own solar power supply or by alternating current. It can achieve timed, quantitative, intermittent, and continuous injection of foam drainage agent and defoaming agent. It has functions such as liquid level display, automatic stop at low level, motor operation, and power storage. According to seasonal changes, the solar panel can adjust its angle to be synchronized with the sun's irradiation direction, increasing the light-receiving area.

[0021] Through the real-time remote transmission of the measured data, the background can monitor the operation of the automatic foam drainage injection device in real time. After analyzing the received information, it can make backend adjustments. By sending instructions through the remote control device, the controller controls the adjustment of the heating device, solenoid valve, safety valve, and injection pump, and can achieve functions such as remote start / stop, flow rate adjustment, pressure observation, liquid level alarm, automatic stop at low level, and frequency conversion control, realizing remote control. Brief Description of the Drawings

[0022] Figure 1 It is the overall structure diagram of the present invention;

[0023] Figure 2 It is the structural schematic diagram of the heating device of the present invention;

[0024] Figure 3 It is the structural schematic diagram of the preliminary filter plate of the present invention in the filtering state;

[0025] Figure 4 It is the structural schematic diagram of the preliminary filter plate of the present invention in the state of cleaning impurities;

[0026] Figure 5 It is the structural schematic diagram of the conveying pipeline of the present invention;

[0027] Figure 6 It is the structural schematic diagram of the support mechanism of the present invention;

[0028] 1. Chemical agent tank, 11. Outer box body, 12. Inner box body, 2. Storage tank, 3. Wellhead connection cylinder, 31. Flange, 32. Foam outlet, 33. Support frame, 34. Hoop, 35. Connecting frame, 41. Heat conducting plate, 42. Electric heating wire, 43. Tension spring, 44. Fixed block, 51. First conveying pipeline, 511. Front section pipeline, 512. Rear section pipeline, 513. Heat preservation cavity, 514. Opening and closing plate, 52. Second conveying pipeline, 53. Third conveying pipeline, 531. Inner rubber layer, 532. Heating layer, 533. Reinforcing layer, 534. Outer rubber layer, 6. Preliminary filter plate, 61. Rotating shaft, 7. Filter, 8. Solenoid valve, 91. Main connecting pipe, 92. Branch connecting pipe, 10. Electric control box, 13. Liquid level gauge, 14. Feeding structure, 15. Injection pump, 16. Driving motor. Detailed Description of the Invention

[0029] To make the technical means and achieved objectives adopted by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0030] Embodiment 1:

[0031] As Figure 1 shown, an automatic foam drainage injection device includes a chemical agent tank 1 for storing foam drainage agent, a storage tank 2 for storing antifreeze, a wellhead connection cylinder 3 connected to the wellbore, and a conveying pipeline.

[0032] The chemical agent tank 1 and the storage tank 2 have the same structure, both having an outer box body 11 and an inner box body 12. A heating device is provided between the inner box body 12 and the outer box body 11 to realize heating and heat preservation of the inner box body 12 through the heating device.

[0033] As Figure 2 shown, the heating device has a heat conduction plate 41 and an electric heating wire 42. The heat conduction plate 41 surrounds and closely adheres to the outside of the inner box body 12. The electric heating wire 42 is attached to the outer surface of the heat conduction plate 41. Fixing blocks 44 are respectively connected to both sides of the heat conduction plate 41. After the heat conduction plate 41 surrounds the outer circumference of the inner box body 12, the two sides with fixing blocks 44 are arranged to be close to each other. The fixing blocks 44 corresponding to both sides of the heat conduction plate 41 are connected by a tension spring 43 to tightly attach the heat conduction plate 41 to the inner box body 12, increasing the heating effect on the inner box body 12. A thermometer is installed in the inner box body 12. The thermometer and the heating device are connected to a controller. The controller is a programmable controller. The thermometer can monitor the heating temperature of the inner box body 12. After reaching the set temperature, the heating device is controlled by the controller to stop heating and only heat preservation is required.

[0034] Liquid level gauges 13 are respectively provided in the chemical agent tank 1 and the storage tank 2. The liquid level height in the tank can be known through the liquid level gauges 13. The liquid level gauges 13 are connected to the controller. When the liquid level is relatively low, the controller controls the alarm device to give an alarm to prompt the staff to add materials to the chemical agent tank 1 and the storage tank 2. The controller is installed inside the electric control box 10.

[0035] Feeding structures 14 are respectively provided on the sides of the chemical agent tank 1 and the storage tank 2. The top of the feeding structure 14 is provided with a feeding port. The feeding structure 14 is communicated with the chemical agent tank 1 and the storage tank 2 through an inclined channel. Since the chemical agent tank 1 and the storage tank 2 are relatively high in height and the feeding port is arranged at the top of the box body, the feeding difficulty is relatively high. By arranging the feeding structure 14 on the side of the box body, it is convenient for feeding.

[0036] The conveying pipeline has a first conveying pipeline 51, a second conveying pipeline 52 and a third conveying pipeline 53. The bottoms of the chemical agent tank 1 and the storage tank 2 are respectively connected to the first conveying pipeline 51 and the second conveying pipeline 52. A preliminary filter plate 6 and a filter 7 are respectively provided on the first conveying pipeline 51 and the second conveying pipeline 52. The preliminary filter plate 6 is arranged close to the bottom of the outer box 11. Solenoid valves 8 are also respectively provided on the first conveying pipeline 51 and the second conveying pipeline 52. The solenoid valves 8 are arranged between the preliminary filter plate 6 and the outer box 11 and are connected to the controller. When the controller controls the solenoid valves 8 to open, the injection operation is carried out. When the solenoid valves 8 are closed, the impurities on the preliminary filter plate 6 can be cleaned. The filter 7 is arranged on the side of the preliminary filter plate 6 away from the outer box 11. The preliminary filter plate 6 can preliminarily remove impurities with larger particles, and the impurities with smaller particles can be filtered and removed by the filter 7 again.

[0037] The first conveying pipeline 51 has a front section pipeline 511 and a rear section pipeline 512. The solenoid valves 8, the preliminary filter plate 6 and the filter 7 are arranged on the front section pipeline 511. A heat preservation cavity 513 is provided on the pipe wall of the front section pipeline 511. A hot air outlet is provided below the outer box 11 of the chemical agent tank 1. The hot air outlet is communicated with the heat preservation cavity 513 on the pipe wall of the front section pipeline 511 through a connecting pipe. An injection pump 15 is connected between the front section pipeline 511 and the rear section pipeline 512. A safety valve and a check valve are installed on the rear section pipeline 512. The configured D20 safety valve has a starting pressure of 8 MPa, with leakage protection and overcurrent protection, and is sealed with a refractory sealant to ensure safety.

[0038] The safety valve and the injection pump 15 are connected to the controller. The injection pump 15 is also provided on the second conveying pipeline 52. The foam drainage agent in the chemical agent tank 1 and the antifreeze in the storage tank 2 are conveyed into the conveying pipeline through the injection pump 15. The injection pump 15 is provided with a frequency conversion adjustment control system, which can adjust the motor frequency of the injection pump 15, change the motor speed, and thus achieve the adjustment of the flow rate of the injection pump 15.

[0039] The front section pipeline 511 of the first conveying pipeline 51 has a vertical pipeline and a horizontal pipeline. The solenoid valves 8 and the preliminary filter plate 6 are arranged on the vertical pipeline, and the filter 7 is arranged on the horizontal pipeline. The connecting pipe has a main connecting pipe 91 and branch connecting pipes 92. The main connecting pipe 91 is communicated with the hot air outlet of the outer box 11. The main connecting pipe 91 is respectively communicated with the heat preservation cavities 513 on the pipe walls of the vertical pipeline and the horizontal pipeline through two branch connecting pipes 92. The hot air between the outer box 11 and the inner box 1 is conveyed into the heat preservation cavity 513 through the connecting pipe, making full use of the heat inside the outer box 11. Moreover, the front section pipeline 511 is relatively close to the chemical agent tank 1, and the temperature drop is small, and the heat inside the outer box 11 can meet the heating requirement.

[0040] The first conveying pipeline 51 and the second conveying pipeline 52 are respectively connected to the third conveying pipeline 53. The connection end of the second conveying pipeline 52 and the third conveying pipeline 53 is arranged close to the connection end of the first conveying pipeline 51 and the third conveying pipeline 53. A pressure sensor, a temperature sensing device and a flowmeter are installed on the third conveying pipeline 53. The pressure sensor, the temperature sensing device and the flowmeter are respectively connected to the controller. The pressure in the conveying pipeline is sensed by the pressure sensor to ensure that the pressure meets the setting and satisfies the conveying requirement. The electric heating temperature can be sensed by the temperature sensing device, and heat preservation can be carried out after the set temperature is met. The conveying flow can be known through the flowmeter, and the flow rate of the injection pump 15 can be adjusted according to the requirement.

[0041] The third conveying pipeline 53 is connected to the wellhead connecting cylinder 3, and one end of the third conveying pipeline 53 penetrates into the inside of the wellhead connecting cylinder 3 to the bottom of the wellhead connecting cylinder 3. A one-way valve is provided at one end of the third conveying pipeline 53 close to the wellhead connecting cylinder 3. The wellhead connecting cylinder 3 is connected to the wellhead of the wellbore through a flange 31. A bubble outlet 32 is provided on the side of the wellhead connecting cylinder 3. After the wellhead connecting cylinder 3 is connected to the wellbore, the mixture of the foam drainage agent and the antifreeze enters the wellbore through the outlet end of the third conveying pipeline 53.

[0042] The bubble outlet 32 is communicated with an external defoaming device. Foaming and defoaming are arranged in parallel, and electromagnetic valves 8 are respectively arranged on the conveying pipelines of foaming and defoaming. The controller can respectively control the electromagnetic valves 8 on different pipelines.

[0043] A support mechanism is provided at the top of the wellhead connecting cylinder 3. Combining Figure 6 , the support mechanism has a support frame 33 and a hoop 34. The support frame 33 is fixed on both sides of the top of the wellhead connecting cylinder 3. Two parts of the hoop 34 are respectively connected and fixed to the top of the support frame 33 through a connecting frame 35. The two parts of the hoop 34 are locked by bolts. The third conveying pipeline 53 is supported by the support mechanism, and the structure is stable during the conveying process of the foam drainage agent.

[0044] The connection method and control method of the controller and each electrical device are conventional existing technologies well-known to those skilled in the art, and will not be elaborated specifically.

[0045] Working principle: The medicine tank 1 and the storage tank 2 are heated and insulated by a heating device. The heating device conducts heat through a heat conduction plate 41, and the heat conduction plate 41 is tightly attached to the inner box body 12 to improve the heating effect. The conveying pipeline is heated and insulated to prevent the fluid from freezing. Different conveying sections are heated by different heating methods. The front section pipeline 511 of the first conveying pipeline 51 is heated by the hot air between the outer box body 11 and the inner box body 12 of the medicine tank 1, making full use of the heat inside the outer box body 11. The front section pipeline 511 is close to the medicine tank 1, and the temperature drop is small, so the heat inside the outer box body 11 can meet the heating needs. The rear section pipeline 512 of the first conveying pipeline 51 and the third conveying pipeline 53 are heated by electric heating wires for heat preservation, and an antifreeze agent is added into the third conveying pipeline 53 through the second conveying pipeline 52 to ensure that the foam drainage agent will not freeze during the conveying process in case of low temperature, and the fluid can remain unfrozen at -30°C, ensuring the smooth progress of the filling operation.

[0046] The foam drainage agent and the antifreeze agent are first preliminarily filtered for large particle impurities through a preliminary filter plate 6 in the conveying pipeline, and then filtered for small particle impurities through a filter 7. Before injecting into the wellbore, the impurities in the foam drainage agent are filtered and removed to improve the foam drainage operation efficiency.

[0047] The signals of the liquid level gauge 13, the pressure sensor, the temperature sensing device, and the flowmeter are all connected to the programmable logic controller PLC. To achieve remote monitoring and control, the controller is connected to the wireless remote control device at the background through a wireless communication unit to realize remote control of the heating device, the solenoid valve 8, the safety valve, and the injection pump 15. Moreover, the measured values of the liquid level gauge 13, the pressure sensor, the temperature sensing device, and the flowmeter obtained by the controller are transmitted to the Internet of Things background through the wireless communication unit, and the background is displayed through a display device. The pressure sensor value is connected to the programmable logic controller PLC through a 4-20mA signal, and can be viewed on the touch screen on-site. The temperature sensing device value is connected to the programmable logic controller PLC through an I / O point, and the temperature can be viewed and set on the touch screen on-site. The injection pump 15 is connected to the programmable logic controller PLC, and the flow rate of the injection pump 15 can be set on the touch screen on-site. The programmable logic controller PLC is connected to the Internet of Things devices of on-site equipment through RS485 for data monitoring, control of the filling process, and on-site fault prompt.

[0048] Through the real-time remote transmission of the measured data, the background can remotely and real-timely monitor the operation status of the automatic foam drainage filling device. After analyzing the received information, backend adjustment can be carried out. By sending instructions through the remote control device, the controller controls the adjustment of the heating device, the solenoid valve 8, the safety valve, and the injection pump 15, and functions such as remote start / stop, flow rate adjustment, pressure observation, liquid level alarm, low-level self-stop, and frequency conversion control can be realized, thus achieving automatic filling.

[0049] Example 2:

[0050] The difference between this example and Example 1 is that as Figure 3 shown, the preliminary filter plate 6 is arranged on the vertical pipelines of the first conveying pipeline 51 and the second conveying pipeline 53. The vertical pipeline is a square columnar pipeline. One side of the vertical pipeline has an opening and closing plate 514. The bottom of the opening and closing plate 514 is integrally connected to one end of the preliminary filter plate 6. Rotating shafts 61 are respectively connected to both sides below the opening and closing plate 514. The rotating shafts 61 pass through the pipe wall of the vertical pipeline and extend to the outside of the vertical pipeline. A driving motor 16 is arranged outside the vertical pipeline. The output shaft of the driving motor 16 is connected to the rotating shaft 61 through a synchronous belt. The driving motor 16 is connected to the controller. The controller controls the driving motor 16 to start. As Figure 4 shown, the driving motor 16 drives the opening and closing plate 514 and the preliminary filter plate 6 to rotate, and the preliminary filter plate 6 can be rotated to the outside of the first conveying pipeline 51, and both the preliminary filter plate 6 and the opening and closing plate 514 are inclined, which is convenient for pouring out the impurities filtered on the preliminary filter plate 6. The poured impurities can slide down along the inclined opening and closing plate 514 into the impurity collection box below, avoiding the cumbersome operation steps of manually taking out the preliminary filter plate 6 for cleaning and improving the cleaning efficiency.

[0051] Sealing gaskets are respectively arranged at the bottom and top of the opening and closing plate 514, and a sealing gasket is also arranged at one end of the preliminary filter plate 6 far away from the opening and closing plate 514 to ensure that the first conveying pipeline 51 remains sealed when the foam drainage agent is injected.

[0052] Example 3:

[0053] The difference between this example and Example 1 is that the pipeline structures of the rear section pipeline 512 of the first conveying pipeline 51 and the third conveying pipeline 53 are as Figure 5 shown. The pipe wall of the pipeline has an inner rubber layer 531, a heating layer 532, a reinforcing layer 533 and an outer rubber layer 534. The inner rubber layer 531, the heating layer 532, the reinforcing layer 533 and the outer rubber layer 534 are arranged in sequence from the inside to the outside. The heating layer 532 has electric heating wires wound around the outer circumference of the inner rubber layer 531, and the electric heating wires are energized with an external power supply. The reinforcing layer 533 has a specially treated high-strength steel wire winding layer wound around the outer circumference of the heating layer 532. The reinforcing layer 533 is arranged outside the heating layer of the rear section pipeline of the first conveying pipeline 51 and the third conveying pipeline 53. In the case of having a cavity provided with the heating layer 532, the strength of the pipeline is ensured.

[0054] The inner rubber layer 531 is a polyamide layer, and the outer rubber layer 534 is a polyurethane layer. The pipeline is a high-pressure hose, which has small fluid resistance, small volume expansion, good chemical corrosion resistance, light weight, and a maximum working pressure of up to 55 MPa, and the conveying is more stable.

[0055] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An automatic foam drainage injection device, characterized in that, it includes a chemical agent tank (1) for storing foam drainage agent, a storage tank (2) for storing antifreeze, and a wellhead connection cylinder (3) connected to the wellbore. The chemical agent tank (1), the storage tank (2), and the wellhead connection cylinder (3) are connected through a conveying pipeline.

2. The automatic foam drainage injection device according to claim 1, characterized in that, the chemical agent tank (1) and the storage tank (2) have the same structure, both having an outer box body (11) and an inner box body (12).

3. The automatic foam drainage injection device according to claim 2, characterized in that, liquid level gauges (13) are respectively arranged in the chemical agent tank (1) and the storage tank (2).

4. The automatic foam drainage injection device according to claim 3, characterized in that, feeding structures (14) are respectively arranged on the sides of the chemical agent tank (1) and the storage tank (2). The top of the feeding structure (14) is provided with a feeding port. The feeding structure (14) is communicated with the chemical agent tank (1) and the storage tank (2) through an inclined channel.

5. The automatic foam drainage injection device according to claim 4, characterized in that, a heating device is arranged between the inner box body (12) and the outer box body (11), and the inner box body (12) is heated and insulated through the heating device.

6. The automatic foam drainage injection device according to claim 5, characterized in that, the heating device has a heat conducting plate (41) and an electric heating wire (42). The heat conducting plate (41) surrounds and closely adheres to the outside of the inner box body (12). Fixing blocks (44) for fixing a tension spring (43) are arranged on the heat conducting plate (41). The two sides of the heat conducting plate (41) are connected through the tension spring (43). The electric heating wire (42) is arranged attached to the outer surface of the heat conducting plate (41).

7. The automatic foam drainage injection device according to claim 6, characterized in that, the conveying pipeline includes a first conveying pipeline (51), a second conveying pipeline (52), and a third conveying pipeline (53). The bottom of the chemical agent tank (1) is connected to the first conveying pipeline (51). The bottom of the storage tank (2) is connected to the second conveying pipeline (52). Preliminary filter plates (6) and filters (7) are respectively arranged on the first conveying pipeline (51) and the second conveying pipeline (52). The preliminary filter plate (6) is arranged near the bottom of the outer box body (11). Solenoid valves (8) are also respectively arranged on the first conveying pipeline (51) and the second conveying pipeline (52). The solenoid valve (8) is arranged between the preliminary filter plate (6) and the outer box body (11). The filter (7) is arranged on the side of the preliminary filter plate (6) away from the outer box body (11); The first conveying pipeline (51) includes a front-section pipeline (511) and a rear-section pipeline (512). The solenoid valve (8), the preliminary filter plate (6), and the filter (7) are arranged on the front-section pipeline (511). A heat preservation cavity (513) is provided on the pipe wall of the front-section pipeline (511). A hot air outlet is provided below the outer box body (11) of the chemical agent tank (1). The hot air outlet is communicated with the heat preservation cavity (513) on the pipe wall of the front-section pipeline (511) through a connecting pipe. An injection pump (15) is connected between the front-section pipeline (511) and the rear-section pipeline (512). A safety valve and a check valve are installed on the rear-section pipeline (512). An injection pump (15) is also provided on the second conveying pipeline (52); The output end of the first conveying pipeline (51) and the output end of the second conveying pipeline (52) are respectively communicated with the input end of the third conveying pipeline (53). A pressure sensor, a temperature sensing device, and a flowmeter are installed on the third conveying pipeline (53). The output end of the third conveying pipeline (53) is connected to the wellhead connection cylinder (3), and one end of the third conveying pipeline (53) penetrates into the inside of the wellhead connection cylinder (3) to the bottom of the wellhead connection cylinder (3). A check valve is provided at one end of the third conveying pipeline (53) close to the wellhead connection cylinder (3).

8. The automatic foam drainage injection device according to claim 7, characterized in that the wellhead connection cylinder (3) is connected to the wellhead of the wellbore through a flange plate (31).

9. The automatic foam drainage injection device according to claim 8, characterized in that the heating device, the liquid level gauge (13), the solenoid valve (8), the safety valve, the injection pump (15), the pressure sensor, the temperature sensing device, and the flowmeter are all connected to the controller of the electric control box (10). The controller is connected with an alarm device.

10. The automatic foam drainage injection device according to claim 9, characterized in that the controller is connected to a wireless remote control device at the background through a wireless communication unit to realize remote control of the heating device, the solenoid valve (8), the safety valve, and the injection pump (15). Moreover, the measured values of the liquid level gauge (13), the pressure sensor, the temperature sensing device, and the flowmeter obtained by the controller are transmitted to the background through the wireless communication unit. The background realizes remote monitoring of the values through a display device.

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