Injecting agent and forced drainage composite liquid drainage equipment and method

Abstract

The invention discloses agent injection and forced drainage composite liquid drainage equipment and method.The equipment comprises a well pipe valve, the outer side of the well pipe valve is connected with a foaming agent device through a pipeline, the outer side of the well pipe valve is provided with separation equipment, the well pipe valve is connected with the separation equipment through a pipeline, and the gas outlet end of the separation equipment is connected with a gas conveying pipe; a two-way valve is installed on the outer side of the air conveying pipe, an impeller drives a gear ring to rotate through a rotating rod, the gear ring drives a plurality of transmission gears which are connected in an engaged mode to rotate, the transmission gears drive second reciprocating lead screws to rotate, then the second reciprocating lead screws drive a connecting frame to move in a reciprocating mode, and the purpose of driving a pushing plate is achieved. The air injection speed of the inflator pump can be automatically adjusted according to the flow speed of air in the pressure relief pipe, the automatic adjusting effect is achieved, and sufficient combustion of the air is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of natural gas well drainage and gas production technology, specifically relating to a combined drainage device for injection and forced drainage, and also to a combined drainage method for injection and forced drainage. Background Technology

[0002] As natural gas well development enters its mid-to-late stages, the accumulation of fluid at the bottom of the well can severely impact well production and even lead to waterlogging and shutdown. Foam drainage gas production technology is the dominant technology for removing accumulated fluid from gas wells and maintaining stable production, and it is the most widely used among various drainage gas production technologies.

[0003] Chinese invention patent CN114526023A discloses a combined injection and forced drainage device and method. The combined injection and forced drainage device includes a control system; an injection pipeline selectively connected to the annulus of the oil casing, the injection pipeline being controlled by the control system to determine the injection time and amount; a gas transmission pipeline selectively connected to the oil pipeline, the gas transmission pipeline being controlled by the control system to open or close; and a pressure relief pipeline selectively connected to the oil pipeline, the pressure relief pipeline being open or closed under the control of the control system, and the pressure relief pipeline being equipped with a burner to release combustible materials into the atmosphere after combustion.

[0004] When foaming agents are injected into gas wells through injection equipment, existing technologies add surfactants to improve the performance of the foaming agents. However, the surfactants are affected by shear forces and acceleration forces in the wellbore, leading to the degradation of the surfactants and thus weakening the foaming effect. Furthermore, during depressurization combustion, oxygen needs to be added to ensure complete combustion when the gas is ignited. However, if a large amount of oxygen is continuously injected due to different gas flow rates, the oxygen will disperse the heat energy in the combustion material, making the combustion unstable and lowering the temperature after combustion. This inevitably leads to waste.

[0005] Therefore, it is necessary to provide a combined injection and forced drainage device and method to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a combined injection and forced drainage device, which solves the problems of the addition of surfactants affecting the foaming effect and energy waste during the depressurization and combustion process in the existing foam drainage gas extraction process.

[0007] The purpose of this invention is to provide a combined drainage method that combines injection and forced drainage.

[0008] The first technical solution adopted in this invention is: a composite drainage device for injection and forced drainage, including a well pipe valve, a foaming agent device connected to the outside of the well pipe valve via a pipeline, a separation device installed outside the well pipe valve, the well pipe valve and the separation device connected via a pipeline, a gas supply pipe connected to the gas outlet of the separation device, a two-way valve installed on the gas supply pipe, a pressure relief pipe fixedly connected to one side of the two-way valve, a burner for combustion gas fixedly connected to the pressure relief pipe, a mixing tank installed outside the separation device, a pipeline connecting the liquid outlet of the separation device and the mixing tank, a foaming agent device connected to the mixing tank via a mixing component, a pipeline connecting the bottom of the mixing tank to the well pipe valve, and a delivery pump installed on the pipeline.

[0009] The invention is further characterized in that,

[0010] As a further aspect of the present invention: the mixing assembly includes a rotating tube and a rotating shaft disposed at the top of the mixing chamber, the rotating tube being rotatably connected to a conveying pipe, the conveying pipe being connected to the output end of the foaming agent device; transmission wheels are installed on the outer sides of both the rotating tube and the rotating shaft, and the two transmission wheels are connected by belt drive; a servo motor is also installed on the outer side of the mixing chamber, and the output end of the servo motor is fixedly connected to the rotating shaft.

[0011] As a further aspect of the present invention: the rotating tube extends downward into the mixing chamber and is rotatably connected to the connecting cylinder located at the bottom of the mixing chamber. Multiple feed tubes are fixedly connected to the outside of the connecting cylinder. The multiple feed tubes extend into the inside of the fixed cylinder and are fixedly connected to the fixed cylinder. A one-way valve is installed on the feed tube. A stirring rod is provided inside the mixing chamber. The stirring rod is connected to the upper part of the rotating tube. A first reciprocating screw is sleeved in the middle of the rotating tube. A fixing frame is connected to the outside of the first reciprocating screw through a ball nut pair. The fixing frames extend into the inside of multiple fixing cylinders and are slidably connected to the fixing cylinders.

[0012] As a further aspect of the present invention: a plurality of extrusion discs are provided inside the fixed cylinder, the extrusion discs are fixedly connected to the bottom of the fixed frame and fit against the inner wall of the fixed cylinder, a through pipe is installed near the bottom outer side of the fixed cylinder, a connecting pipe is provided inside the extrusion discs, and a one-way water inlet valve is installed on the connecting pipe.

[0013] As a further aspect of the present invention: a plurality of air-injecting components are provided on the outside of the pressure relief pipe for injecting air into the burner, an impeller is provided inside the pressure relief pipe, and a transmission component is provided between the impeller and the air-injecting components. The air injection rate of the air-injecting components is adjusted by the transmission component driven by the flow rate of the gas inside the pressure relief pipe.

[0014] As a further embodiment of the present invention: the transmission component includes a rotating rod fixedly connected to the impeller, a support plate rotatably connected to the outside of the rotating rod, the support plate being fixedly connected to the inner wall of the pressure relief pipe, and a gear ring fixedly connected to the outside of the support plate. The gear ring is sleeved on the pressure relief pipe and forms a rotatable connection with the pressure relief pipe. The inner ring of the gear ring is located inside the pressure relief pipe, and the outer ring is located outside the pressure relief pipe.

[0015] As a further aspect of the present invention: the transmission component also includes a transmission gear meshing with the gear ring, a second reciprocating screw fixedly connected to one side of the transmission gear, a support plate rotatably mounted on the inner side of the second reciprocating screw, the support plate being fixedly connected to the pressure relief pipe, and the second reciprocating screw passing through the connecting frame and connected to the connecting frame via a ball nut pair.

[0016] As a further aspect of the present invention: the inflation component includes an inflation cylinder fixedly connected to the outside of the pressure relief pipe, a push plate is provided inside the inflation cylinder, a connecting frame is fixedly connected to the push plate, the connecting frame passes through one end of the inflation cylinder and is slidably connected to the inflation cylinder, an injection pipe is fixedly connected between the inflation cylinder and the burner, and the injection pipe is located at the end away from the connecting frame; an air inlet pipe is also provided on the inflation cylinder, a one-way air inlet valve is installed on the air inlet pipe, and a one-way air outlet valve is installed on the injection pipe.

[0017] The second technical solution adopted in this invention is a combined drainage method of injection and forced drainage, the specific operation steps of which are as follows:

[0018] Step 1: First, inject foaming agent into the well pipe valve through the foaming agent device. After foaming is completed, open the foaming agent device to inject gas and liquid into the separation equipment for separation.

[0019] Step 2: The separated gas is transported to the outside through the gas pipeline, and the separated liquid is injected into the mixing tank;

[0020] Step 3: Then, the foaming agent is injected into the mixing tank through the foaming agent device and the foaming agent is mixed by the mixing components inside the mixing tank. After the mixture is mixed, it is injected back into the well pipe valve through the delivery pump for circulation.

[0021] Step 4: When pressure relief is required, close the gas supply pipe to allow the gas to be injected into the burner through the pressure relief pipe for combustion and discharge.

[0022] Step 3 is as follows:

[0023] The rotating shaft is activated, and the rotating tube is driven by a belt and drive wheel on the outside of the rotating shaft. The rotating tube rotates, which drives the first reciprocating screw on the outside to rotate. The first reciprocating screw drives the fixed frame to move up and down, causing the fixed frame to move the fixedly connected extrusion plate up and down inside the fixed cylinder. When the extrusion plate rises, the negative pressure forces the liquid in the mixing tank into the bottom of the fixed cylinder through the connecting pipe. The foaming agent is then injected into the fixed cylinder through the connecting pipe and mixed with the liquid. When the extrusion plate descends, it squeezes the liquid, thus mixing the liquid and foaming agent through compression. The mixture is then discharged into the fixed cylinder through the connecting pipe. The mixing effect is further improved by the rotation of the stirring rod.

[0024] The beneficial effects of this invention are:

[0025] 1. The separated liquid is fed into the mixing tank through the control pipeline. At this time, the foaming agent inside the foaming agent device is transported to the well pipe valve through the rotating pipe for remixing. The mixed liquid is then injected back into the well pipe valve through the delivery pump to improve the foaming efficiency of the foaming agent.

[0026] 2. The impeller drives the gear ring to rotate via the rotating rod. The gear ring drives multiple meshing transmission gears to rotate. The transmission gears drive the second reciprocating screw to rotate, which in turn drives the connecting frame to move back and forth, thereby driving the push plate. It can automatically adjust the air injection rate of the air cylinder according to the gas flow rate inside the pressure relief pipe, achieving an automatic adjustment effect and ensuring complete combustion of the gas. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the composite drainage device for injection and forced drainage of the present invention;

[0028] Figure 2 This is a schematic diagram of the mixing box structure of the present invention;

[0029] Figure 3 This is a cross-sectional view of the mixing box of the present invention;

[0030] Figure 4 This is a cross-sectional schematic diagram of the fixing cylinder of the present invention;

[0031] Figure 5 This is a schematic diagram of the pressure relief pipe structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the impeller structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the transmission component structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the inflatable component of the present invention.

[0035] In the diagram: 1. Well casing valve; 2. Foaming agent device; 3. Separation equipment; 4. Gas delivery pipe; 6. Burner; 7. Two-way valve; 8. Mixing box; 801. Rotating pipe; 802. First reciprocating screw; 803. Stirring rod; 804. Fixing frame; 805. Fixing cylinder; 806. Extrusion disc; 807. Connecting cylinder; 808. Inlet pipe; 809. Connecting pipe; 810. Through pipe; 811. Rotating shaft; 812. Servo motor; 813. Delivery pipe; 9. Delivery pump; 10. Pressure relief pipe; 101. Impeller; 102. Air charging cylinder; 103. Gas injection pipe; 104. Second reciprocating screw; 105. Connecting frame; 106. Push plate; 107. Air inlet pipe; 108. Transmission gear; 109. Gear ring; 110. Rotating rod; 111. Support plate. Detailed Implementation

[0036] To provide a more complete explanation of the objectives and technical solutions of this invention, the invention will be further described below in conjunction with specific embodiments.

[0037] Example 1

[0038] The present invention provides a combined injection and forced drainage device, such as... Figures 1 to 8 As shown, the system includes a wellbore valve 1, a foaming agent device 2 connected to the outside of the wellbore valve 1 via a pipeline, a separation device 3 installed on the outside of the wellbore valve 1, the wellbore valve 1 and the separation device 3 connected via a pipeline, a gas supply pipe 4 connected to the gas outlet of the separation device 3, a two-way valve 7 installed on the gas supply pipe 4, a pressure relief pipe 10 fixedly connected to one side of the two-way valve 7, and a burner 6 for burning gas fixedly connected to the pressure relief pipe 10, a mixing tank 8 installed on the outside of the separation device 3, the separation device 3 and the liquid outlet of the mixing tank 8 connected via a pipeline, the foaming agent device 2 connected to the mixing tank 8 via a mixing component, the bottom of the mixing tank 8 connected to the wellbore valve 1 via a pipeline, and a delivery pump 9 installed on the pipeline; in specific implementation, foaming agent is injected into the wellbore valve 1 through the foaming agent device 2, and after foaming is completed, the foaming agent device 2 is opened to inject gas and liquid into the foaming agent device 2 for separation; the separated gas is transported to the outside through the gas supply pipe 4, and the separated liquid is injected into the mixing tank 8.

[0039] In practical use, foaming agent is often injected directly into the well pipe valve 1. In order to improve the performance of the foaming agent, the existing technology adds nonionic surfactants to the foaming agent. However, nonionic surfactants contain a lot of polymers. Oil and gas wells are tens or even hundreds of meters deep, which makes the polymer nonionic surfactants inevitably affected by shear force and acceleration force. Shear force and acceleration force will cause the polymer nonionic surfactants to degrade, thereby weakening the foaming effect of the foaming agent. Therefore, the following solution is adopted in this solution: a rotating pipe 801 is rotatably connected inside the mixing box 8. The rotating pipe 801 is hollow. The top of the rotating pipe 801 is rotatably connected to the delivery pipe 813. The delivery pipe 813 is connected to the output end of the foaming agent device 2. A mixing component is set inside the mixing box 8.

[0040] In practice, the separated liquid is brought into the mixing tank 8 through the control pipeline. At this time, the foaming agent in the foaming agent device 2 is transported to the well pipe valve 1 through the rotating pipe 801 for remixing. The mixed liquid is then reinjected into the well pipe valve 1 through the delivery pump 9 to improve the foaming efficiency of the foaming agent.

[0041] Example 2

[0042] Based on Example 1,

[0043] The mixing assembly includes a rotating tube 801 and a rotating shaft 811 disposed at the top of the mixing chamber. The rotating tube 801 is rotatably connected to a conveying tube 813, which is connected to the output end of the foaming agent device 2. Both the rotating tube 801 and the rotating shaft 811 are equipped with drive wheels, which are connected by a belt drive. A servo motor 812 is also installed on the outside of the mixing chamber 8, and the output end of the servo motor 812 is fixedly connected to the rotating shaft 811.

[0044] The rotating tube 801 extends downward into the mixing chamber 8 and is rotatably connected to the connecting cylinder 807 located at the bottom of the mixing chamber. Multiple inlet tubes 808 are fixedly connected to the outside of the connecting cylinder 807. The multiple inlet tubes 808 extend into the fixed cylinder 805 and are fixedly connected to the fixed cylinder 805. A one-way valve is installed on the inlet tube 808. The mixing chamber 8 is provided with a stirring rod 803. The stirring rod 803 is connected to the upper part of the rotating tube 801. A first reciprocating screw 802 is sleeved in the middle of the rotating tube 801. A fixing frame 804 is connected to the outside of the first reciprocating screw 802 through a ball nut pair. The fixing frames 804 extend into the multiple fixing cylinders 805 and are slidably connected to the fixing cylinders 805.

[0045] The fixed cylinder 805 is provided with a plurality of extrusion discs 806. The extrusion discs 806 are fixedly connected to the bottom of the fixed frame 804 and fit against the inner wall of the fixed cylinder 805. A through pipe 810 is installed on the outer side of the fixed cylinder 805 near the bottom. A connecting pipe 809 is provided inside the extrusion discs 806. A one-way water inlet valve is installed on the connecting pipe 809.

[0046] In this specific implementation, the rotating shaft 811 is activated, and the rotating shaft 811 and the belt and drive wheel on the outside of the rotating tube 801 are driven to rotate. The rotation of the rotating tube 801 drives the first reciprocating screw 802 on the outside to rotate. The first reciprocating screw 802 drives the fixed frame 804 on the outside to reciprocate and rise and fall. The fixed frame 804 drives the fixedly connected extrusion plate 806 to move up and down inside the fixed cylinder 805. When the extrusion plate 806 rises, the external liquid enters the bottom of the extrusion plate 806 through the through pipe 810 through the negative pressure. The extrusion plate 806 injects foaming agent into the mixing box 8 through the connecting cylinder 807. When it passes through the connecting pipe 809 and mixes with the liquid, the extrusion plate 806 descends and squeezes the liquid, thereby mixing the liquid and foaming agent through the squeeze. The mixture is then discharged into the fixed cylinder 805 through the through pipe 810. At this time, the stirring rod 803 rotates, thereby further improving the mixing effect.

[0047] Example 3

[0048] The difference between this embodiment and the above embodiment is that: a plurality of air-injecting components for injecting air into the burner 6 are provided on the outside of the pressure relief pipe 10, an impeller 101 is provided inside the pressure relief pipe 10, and a transmission component is provided between the impeller 101 and the air-injecting components. The air injection rate of the air-injecting components is adjusted by the transmission component driven by the flow rate of the gas inside the pressure relief pipe 10.

[0049] The transmission component includes a rotating rod 110 fixedly connected to the impeller 101. A support plate 111 is rotatably connected to the outer side of the rotating rod 110. The support plate 111 is fixedly connected to the inner wall of the pressure relief pipe 10. A gear ring 109 is fixedly connected to the outer side of the support plate 111. The gear ring 109 is sleeved on the pressure relief pipe 10 and forms a rotatable connection with the pressure relief pipe 10. The inner ring of the gear ring 109 is located inside the pressure relief pipe 10, and the outer ring is located outside the pressure relief pipe 10.

[0050] The transmission component also includes a transmission gear 108 that meshes with the gear ring 109. A second reciprocating screw 104 is fixedly connected to one side of the transmission gear 108. A support plate is rotatably mounted on the inner side of the second reciprocating screw 104. The support plate is fixedly connected to the pressure relief pipe 10. The second reciprocating screw 104 passes through the connecting frame 105 and is connected to the connecting frame 105 through a ball nut pair.

[0051] The inflation component includes an inflation cylinder 102 fixedly connected to the outside of the pressure relief pipe 10. A push plate 106 is provided inside the inflation cylinder 102. A connecting frame 105 is fixedly connected to the push plate 106. The connecting frame 105 passes through one end of the inflation cylinder 102 and is slidably connected to the inflation cylinder 102. An injection pipe 103 is fixedly connected between the inflation cylinder 102 and the burner 6. The end of the injection pipe 103 away from the connecting frame 105 is provided. An air inlet pipe 107 is also provided on the inflation cylinder 102. A one-way air inlet valve is installed on the air inlet pipe 107. A one-way air outlet valve is installed on the injection pipe 103.

[0052] Example 4

[0053] Step 1: First, inject foaming agent into the well pipe valve through the foaming agent device. After foaming is completed, open the foaming agent device to inject gas and liquid into the separation equipment for separation.

[0054] Step 2: The separated gas is transported to the outside through the gas pipeline, and the separated liquid is injected into the mixing tank;

[0055] Step 3: Then, the foaming agent is injected into the mixing tank through the foaming agent device and the foaming agent is mixed by the mixing components inside the mixing tank. After the mixture is mixed, it is injected back into the well pipe valve through the delivery pump for circulation.

[0056] Step 4: When pressure relief is required, close the gas supply pipe to allow the gas to be injected into the burner through the pressure relief pipe for combustion and discharge.

[0057] Step 3 is as follows:

[0058] By starting the rotating shaft 811, the rotating tube 801 is driven to rotate via the belt and drive wheel on the outside of the rotating shaft 811 and the rotating tube 801. The rotation of the rotating tube 801 drives the first reciprocating screw 802 on the outside to rotate. The first reciprocating screw 802 drives the fixed frame 804 to reciprocate up and down, causing the fixed frame 804 to drive the fixedly connected extrusion plate 806 to move up and down inside the fixed cylinder 805. When the extrusion plate 806 rises, the negative pressure forces the liquid in the mixing box to enter the bottom of the fixed cylinder 805 through the through pipe 810. The foaming agent is injected into the fixed cylinder 805 through the connecting cylinder 807 connected to the rotating tube 801. When the foaming agent mixes with the liquid through the connecting pipe 809, the extrusion plate 806 descends and squeezes the liquid, thus mixing the liquid and foaming agent through the squeeze. The mixture is then discharged into the fixed cylinder 805 through the through pipe 810. The mixing effect is further improved by the rotation of the stirring rod 803.

Claims

1. A combined injection and forced drainage device, characterized in that, The system includes a well pipe valve (1), a foaming agent device (2) connected to the outside of the well pipe valve (1) via a pipe, a separation device (3) provided on the outside of the well pipe valve (1), the well pipe valve (1) and the separation device (3) connected via a pipe, a gas supply pipe (4) connected to the gas outlet end of the separation device (3), a two-way valve (7) installed on the gas supply pipe (4), a pressure relief pipe (10) fixedly connected to one side of the two-way valve (7), a burner (6) for burning gas fixedly connected to the pressure relief pipe (10), a mixing box (8) provided on the outside of the separation device (3), a pipe connecting the liquid outlet end of the separation device (3) and the mixing box (8), the foaming agent device (2) connected to the mixing box (8) via a mixing component, the bottom of the mixing box (8) connected to the well pipe valve (1) via a pipe, and a delivery pump (9) provided on the pipe.

2. The combined injection and forced drainage device according to claim 1, characterized in that, The mixing assembly includes a rotating tube (801) and a rotating shaft (811) disposed on the top of the mixing tank. The rotating tube (801) is rotatably connected to a conveying tube (813), which is connected to the output end of the foaming agent device (2). Both the rotating tube (801) and the rotating shaft (811) are equipped with drive wheels on their outer sides, and the two drive wheels are connected by a belt drive. A servo motor (812) is also installed on the outer side of the mixing tank (8), and the output end of the servo motor (812) is fixedly connected to the rotating shaft (811). The rotating tube (801) extends downward into the mixing box (8) and is rotatably connected to the connecting cylinder (807) located at the bottom of the mixing box. Multiple feed tubes (808) are fixedly connected to the outside of the connecting cylinder (807). The multiple feed tubes (808) extend into the fixed cylinder (805) and are fixedly connected to the fixed cylinder (805). A one-way valve is installed on the feed tube (808). A stirring rod (803) is provided in the mixing box (8). The stirring rod (803) is connected to the upper part of the rotating tube (801). A first reciprocating screw (802) is sleeved in the middle of the rotating tube (801). A fixing frame (804) is connected to the outside of the first reciprocating screw (802) through a ball nut pair. The fixing frames (804) extend into the interior of multiple fixing cylinders (805) and are slidably connected to the fixing cylinders (805). The fixed cylinder (805) is provided with an extrusion plate (806) inside. The extrusion plate (806) is fixedly connected to the bottom of the fixed frame (804) and fits against the inner wall of the fixed cylinder (805). A through pipe (810) is installed on the outer side of the fixed cylinder (805) near the bottom. A connecting pipe (809) is provided inside the extrusion plate (806). A one-way water inlet valve is installed on the connecting pipe (809).

3. The combined injection and forced drainage device according to claim 2, characterized in that, The pressure relief pipe (10) is provided with a plurality of air-filling components that inject air into the burner (6) on the outside. An impeller (101) is provided inside the pressure relief pipe (10). A transmission component is provided between the impeller (101) and the air-filling components. The air-filling component is adjusted by the transmission component driven by the flow rate of the gas inside the pressure relief pipe (10).

4. The combined injection and forced drainage device according to claim 3, characterized in that, The transmission component includes a rotating rod (110) fixedly connected to the impeller (101), a support plate (111) rotatably connected to the outside of the rotating rod (110), the support plate (111) being fixedly connected to the inner wall of the pressure relief pipe (10), and a gear ring (109) fixedly connected to the outside of the support plate (111), the gear ring (109) being sleeved on the pressure relief pipe (10) and forming a rotatable connection with the pressure relief pipe (10).

5. The combined injection and forced drainage device according to claim 4, characterized in that, The transmission component also includes a transmission gear (108) meshing with the gear ring (109). A second reciprocating screw (104) is fixedly connected to one side of the transmission gear (108). A support plate is rotatably mounted on the inner side of the second reciprocating screw (104). The support plate is fixedly connected to the pressure relief pipe (10). The second reciprocating screw (104) passes through the connecting frame (105) and is connected to the connecting frame (105) through a ball nut pair.

6. The combined injection and forced drainage device according to claim 3, characterized in that, The inflation component includes an inflation cylinder (102) fixedly connected to the outside of the pressure relief pipe (10). A push plate (106) is provided inside the inflation cylinder (102). A connecting frame (105) is fixedly connected to the push plate (106). The connecting frame (105) passes through one end of the inflation cylinder (102) and is slidably connected to the inflation cylinder (102). An injection pipe (103) is fixedly connected between the inflation cylinder (102) and the burner (6). The injection pipe (103) is located at one end away from the connecting frame (105). An air inlet pipe (107) is also provided on the inflation cylinder (102). A one-way air inlet valve is installed on the air inlet pipe (107). A one-way air outlet valve is installed on the injection pipe (103).

7. A combined drainage method of injection and forced drainage, characterized in that, The specific operating steps are as follows: Step 1: First, inject foaming agent into the well pipe valve through the foaming agent device. After foaming is completed, open the foaming agent device to inject gas and liquid into the separation equipment for separation. Step 2: The separated gas is transported to the outside through the gas pipeline, and the separated liquid is injected into the mixing tank; Step 3: Then, the foaming agent is injected into the mixing tank through the foaming agent device and the foaming agent is mixed by the mixing components inside the mixing tank. After the mixture is mixed, it is injected back into the well pipe valve through the delivery pump for circulation. Step 4: When pressure relief is required, close the gas supply pipe to allow the gas to be injected into the burner through the pressure relief pipe for combustion and discharge.

8. The combined injection and forced drainage method according to claim 7, characterized in that, Step 3 is as follows: By starting the rotating shaft (811), the rotating shaft (811) and the belt and drive wheel on the outside of the rotating tube (801) are driven to rotate, causing the rotating tube (801) to rotate. The rotation of the rotating tube (801) drives the first reciprocating screw (802) on the outside to rotate, and the first reciprocating screw (802) drives the fixed frame (804) to reciprocate and rise, causing the fixed frame (804) to drive the fixedly connected extrusion disc (806) to move up and down inside the fixed cylinder (805). The rising of the extrusion disc (806) causes the mixture to rise through negative pressure. The liquid in the tank enters the bottom of the fixed cylinder (805) through the connecting pipe (810), and the foaming agent is injected into the fixed cylinder (805) through the connecting pipe (807) connected to the rotating pipe (801). When the liquid is mixed with the connecting pipe (809), the extrusion plate (806) descends and extrudes the liquid, thereby mixing the liquid and the foaming agent through extrusion. The liquid is then discharged into the fixed cylinder (805) through the connecting pipe (810). The mixing effect is further improved by the rotation of the stirring rod (803).

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