Wind and light complementary power supply's gas well head continuous injection system and injection method

Abstract

The application discloses a gas production wellhead continuous agent injection system powered by wind and light, comprising a wellhead continuous foaming agent injection system and a wellhead continuous defoaming agent injection system, wherein the wellhead continuous foaming agent injection system and the wellhead continuous defoaming agent injection system are identical in structure and principle, both of the systems are connected with a gas production wellhead through a pipeline, the wellhead continuous foaming agent injection system and the wellhead continuous defoaming agent injection system are connected with a wind and light power supply system through a cable, and the wellhead continuous foaming agent injection system, the wellhead continuous defoaming agent injection system and the wind and light power supply system are connected with a same control system respectively. Meanwhile, the application also discloses an agent injection method using the system. The application adopts wind and light complementary power supply and high-pressure tank energy storage technology, effectively utilizes abundant wind energy and solar energy resources of an oilfield, and realizes automatic continuous liquid injection of the system under only signal electricity by means of setting of a hydraulic cylinder and other related components. Meanwhile, through setting of a escapement mechanism, precise agent addition is realized, and on-site adjustment and remote control are facilitated.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction equipment technology, and relates to a continuous injection system for gas wellheads powered by wind and solar hybrid power, as well as an injection method using the system. Background Technology

[0002] Foam drainage gas production is a commonly used gas production technology for water-bearing gas wells. This technology is based on injecting a foaming agent into the annulus at the wellhead to generate foam at the bottom of the well. The foam carries the liquid to the surface, where it is then defoamed and dehydrated. When there is no power supply at the wellhead, and it is necessary to continuously inject foaming agent into the wellbore and defoaming agent into the pipeline, the current process involves: continuous injection of foaming agent using a wellhead balance tank, followed by centralized defoaming at the well site; or using a wind-solar hybrid power supply and a metering pump to continuously inject foaming agent and defoaming agent at the wellhead.

[0003] The main problem with continuous injection of foaming agent using a wellhead balance tank is that the balance tank, being a high-pressure storage device, cannot be too large, resulting in a short delivery cycle. Using a flow meter to control the opening of the shut-off valve for drip injection presents challenges due to the low flow velocity of the agent during dripping, leading to complex and difficult-to-determine flow behavior, potentially exhibiting chaotic or turbulent phenomena, making precise control of the dosage impossible. Utilizing a wind-solar hybrid power supply and employing a metering pump for continuous injection of foaming and defoaming agents presents several issues: unstable wind and solar power necessitates the use of batteries; the metering pump consumes a large amount of power during continuous operation, requiring high-power photovoltaic panels and wind turbines, large-capacity batteries, and high costs. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous injection system for gas wellheads with wind and solar power, which solves the problems of unstable energy supply and high power storage costs in the existing technology; as well as the difficulty in controlling the dosage of foaming agents and defoamers during continuous dripping at the wellhead.

[0005] The technical solution adopted in this invention includes a continuous wellhead foaming agent injection system and a continuous wellhead defoaming agent injection system. The continuous wellhead foaming agent injection system and the continuous wellhead defoaming agent injection system have the same structure and principle. Both systems are connected to the gas wellhead through pipelines. Both systems are connected to the wind and solar power supply system through cables. The continuous wellhead foaming agent injection system, the continuous wellhead defoaming agent injection system, and the wind and solar power supply system are all connected to the same control system.

[0006] The invention is further characterized by: Both the wellhead continuous foaming agent injection system and the wellhead continuous defoaming agent injection system include an atmospheric pressure storage tank. The atmospheric pressure storage tank has an inlet and a return outlet at the top and a outlet at the bottom. The outlet of the atmospheric pressure storage tank is connected to a high-pressure pump and a high-pressure buffer tank in sequence through pipelines. The top of the high-pressure buffer tank is connected to a balance pipe and connected to the gas production wellhead. The high-pressure buffer tank has two outlets. One outlet is connected to an electric three-way valve via a pipeline. The other two ports of the electric three-way valve are connected to a piston rod pressure-changing sealing cylinder and a return port of the atmospheric pressure storage tank via pipelines, respectively. The other outlet of the high-pressure buffer tank is connected to a counterweight sealing cylinder via a pipeline. A hydraulic cylinder is fixedly connected between the counterweight sealing cylinder and the piston rod pressure-changing sealing cylinder, and the hydraulic cylinder and the piston rod pressure-changing sealing cylinder are on the same axis. A suction check valve is fixedly connected to the connecting pipeline between the counterweight sealing cylinder and the high-pressure buffer tank and is connected to the hydraulic cylinder. A discharge check valve is fixedly connected to the surface of the hydraulic cylinder, and both the suction check valve and the discharge check valve are located on the side near the piston rod pressure-changing sealing cylinder. The discharge check valve is connected to the gas wellhead via a pipeline. An interference-fit piston is slidably connected inside the hydraulic cylinder, and a piston rod is fixedly connected to the side of the piston near the piston rod pressure-changing sealing cylinder. The piston rod extends into the piston rod pressure-changing sealing cylinder. Inside the sealed cylinder, the connection between the piston rod and the piston rod pressure-changing sealed cylinder and the hydraulic cylinder is in a dynamic sealing state. On the other side of the piston, a counterweight is fixedly connected by a hinge, and the counterweight is located inside the counterweight sealed cylinder. An escapement mechanism is fixedly connected at the connection between the counterweight sealed cylinder and the hydraulic cylinder, and the hinge engages with the escapement mechanism. The electric three-way valve and the high-pressure pump are both connected to the same electrical control box via cables, and the electrical control box is connected to the wind and solar power supply system and the control system via cables. The piston divides the hydraulic cylinder into a continuous wellhead foaming agent injection system and a continuous wellhead defoaming agent injection system. The continuous wellhead foaming agent injection system and the continuous wellhead defoaming agent injection system have the same structure and principle. Both systems are connected to the gas wellhead via pipelines. Both the continuous wellhead foaming agent injection system and the continuous wellhead defoaming agent injection system are connected to the wind and solar power supply system via cables, and the continuous wellhead foaming agent injection system, the continuous wellhead defoaming agent injection system and the wind and solar power supply system are each connected to the same control system.

[0007] Both the wellhead continuous foaming agent injection system and the wellhead continuous defoaming agent injection system include an atmospheric pressure storage tank. The atmospheric pressure storage tank has an inlet and a return outlet at the top and a outlet at the bottom. The outlet of the atmospheric pressure storage tank is connected to a high-pressure pump and a high-pressure buffer tank in sequence through pipelines. The top of the high-pressure buffer tank is connected to a balance pipe and connected to the gas production wellhead. The high-pressure buffer tank has two outlets. One outlet is connected to an electric three-way valve via a pipeline. The other two ports of the electric three-way valve are connected to a piston rod pressure-changing sealing cylinder and a return port of the atmospheric pressure storage tank via pipelines, respectively. The other outlet of the high-pressure buffer tank is connected to a counterweight sealing cylinder via a pipeline. A hydraulic cylinder is fixedly connected between the counterweight sealing cylinder and the piston rod pressure-changing sealing cylinder, and the hydraulic cylinder and the piston rod pressure-changing sealing cylinder are on the same axis. A suction check valve is fixedly connected to the connecting pipeline between the counterweight sealing cylinder and the high-pressure buffer tank, and is connected to the hydraulic cylinder. A discharge check valve is fixedly connected to the surface of the hydraulic cylinder, and both the suction check valve and the discharge check valve are located on the side closer to the piston rod pressure-changing sealing cylinder. The discharge check valve is connected to the gas wellhead via a pipeline. A piston with an interference fit is slidably connected inside the cylinder, and a piston rod is fixedly connected to the side of the piston near the piston rod pressure-transformer sealing cylinder. The piston rod extends into the piston rod pressure-transformer sealing cylinder, and the connection between the piston rod, the piston rod pressure-transformer sealing cylinder, and the hydraulic cylinder is in a dynamic sealing state. A counterweight is fixedly connected to the other side of the piston via a hinge, and the counterweight is located inside the counterweight sealing cylinder. An escapement mechanism is fixedly connected to the connection between the counterweight sealing cylinder and the hydraulic cylinder, and the hinge engages with the escapement mechanism. The electric three-way valve and the high-pressure pump are both connected to the same electrical control box via cables, and the electrical control box is connected to the wind and solar power supply system and the control system via cables. The piston divides the hydraulic cylinder into two chambers, one of which is the rod chamber near the counterweight sealing cylinder and the other is the rodless chamber.

[0008] The high-pressure pump is a three-cylinder plunger pump, whose discharge pressure is greater than the maximum wellhead pressure of the gas production well; A magnetic ring is fixedly connected to the outside of the piston.

[0009] When the piston rod pressure-changing sealing cylinder is under normal pressure, the pressure in the rodless chamber of the hydraulic cylinder is greater than the sum of the pressure in the rod chamber and the weight of the counterweight, which can drive the piston to move towards the piston rod pressure-changing sealing cylinder.

[0010] A liquid level sensor is fixedly connected to the bottom of the inner wall of the atmospheric pressure storage tank, and the liquid level sensor is connected to the electrical control box via a cable. A liquid level switch is installed at the top and bottom of the inner wall of the high pressure buffer tank, and both liquid level switches are connected to the electrical control box via cables. A magnetic force sensor is fixedly connected to the outer wall of the hydraulic cylinder at one end near the piston rod transformer sealing cylinder and the counterweight sealing cylinder, and both magnetic force sensors are connected to the electrical control box via cables. An electromagnetic pulse controller is fixedly connected to the outer wall of the escapement mechanism, and the electromagnetic pulse controller is connected to the electrical control box via a cable.

[0011] The escapement mechanism includes a housing fixedly connected between the counterweight sealing cylinder and the hydraulic cylinder. A partition is fixedly connected inside the housing, dividing the housing into a high-pressure chamber and an atmospheric-pressure chamber. The high-pressure chamber is connected to the counterweight sealing cylinder and the hydraulic cylinder. A drive shaft is fixedly connected inside the housing, penetrating the partition, and the connection between the drive shaft and the partition is sealed. A sprocket is fixedly connected to a section of the drive shaft, and the sprocket meshes with a hinge. A drive gear is installed on the section of the drive shaft inside the atmospheric-pressure chamber. An overrunning clutch is fixedly connected to the drive shaft, and the drive gear is connected to the drive shaft through the overrunning clutch. A driven shaft parallel to the drive shaft is fixedly connected inside the atmospheric-pressure chamber. A driven gear and a ratchet are fixedly connected side by side on the driven shaft, and the driven gear meshes with the drive gear. An electromagnetic coil is fixedly connected to the inner wall of the atmospheric-pressure chamber, and the electromagnetic coil is electrically connected to an electromagnetic pulse controller. A connecting rod and a spring are sequentially installed at one end of the electromagnetic coil, and the spring is fixedly connected to the inner wall of the atmospheric-pressure chamber. An escape fork is fixedly connected at the connection between the spring and the connecting rod, and the escape fork meshes with the ratchet.

[0012] The gas wellhead includes a small four-way valve and a large four-way valve, which are connected by a pipeline. One side of the small four-way valve is connected to the production pipeline, and the other side is connected to the hydraulic device. The production pipeline is connected to the drain check valve in the continuous defoamer injection system at the wellhead, and the hydraulic device is connected to the high-pressure buffer tank in the continuous defoamer injection system at the wellhead. One side of the gas production tree's large four-way connector is connected to a right-wing plug, and the opposite side is connected to a casing pressure device. The right-wing plug is connected to the high-pressure buffer tank in the wellhead continuous foaming agent injection system, and the casing pressure device is connected to the drain check valve in the wellhead continuous foaming agent injection system.

[0013] The wind and solar power supply system includes inverters connected to two electrical control boxes. The inverters are connected to a solar controller and a wind power controller via cables. The solar controller, wind power controller, and inverters are all connected to the same battery pack. The wind power controller is connected to a wind turbine via cables, and the solar controller is connected to a photovoltaic panel via cables.

[0014] The control system includes an RTU remote monitoring and control terminal connected to the inverter and two electrical control boxes.

[0015] Another technical solution adopted in this invention is a wellhead injection method, which is implemented according to the following steps: Step 1: Add defoamer and foaming agent to the wellhead continuous defoamer injection system and the wellhead continuous foaming agent injection system, respectively; Step 2: Start the system via the control system to administer the injection.

[0016] The beneficial effects of this invention are: 1. This invention utilizes an atmospheric pressure tank for liquid storage and a high-pressure buffer tank for energy storage. During periods of sufficient sunlight or wind power, a high-pressure pump automatically activates based on the liquid level to replenish the high-pressure buffer tank for short periods. Installing a large-capacity atmospheric pressure tank at the wellhead is cost-effective and can effectively extend the manual liquid delivery cycle. The high-pressure buffer tank stores only one to two days' worth of liquid, resulting in a small capacity, low cost, and high safety and reliability. The high-pressure buffer tank replenishment system operates independently without affecting wellhead dripping, requires no metering, is easy to control, and fully utilizes the efficiency of photovoltaic panels and wind turbines. At night when there is no wind, only monitoring power is used, resulting in minimal electricity consumption and effectively reducing the cost of photovoltaic panels and wind turbines, especially battery costs.

[0017] 2. This invention utilizes a small portion of high-pressure liquid to periodically change the pressure inside the piston rod and the pressure-changing sealing cylinder under the control of the control system, creating a pressure difference at both ends of the piston to drive the piston movement and achieve drug injection. This driving method has no energy re-conversion, high driving efficiency, and fewer moving parts and dynamic sealing surfaces, requiring no complex maintenance and ensuring reliable operation; the hydraulic cylinder pressurizes the system, and the high-pressure buffer tank does not need to be elevated, ensuring safety.

[0018] 3. The escapement mechanism in this invention is driven by electromagnetic pulses. The rotation of the sprocket is periodically controlled according to the frequency of the electromagnetic pulses, so that when the piston moves into the rod chamber, a single movement is divided into multiple short-stroke displacements. Each displacement can deliver a certain amount of high-pressure agent into the gas wellhead. By adjusting the frequency of the electromagnetic pulses, the injection amount of high-pressure agent can be adjusted to achieve precise injection of the agent. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the continuous injection system at the gas wellhead for wind-solar hybrid power supply according to the present invention; Figure 2 This is a schematic diagram of the structure of the wellhead continuous foaming agent injection system in this invention; Figure 3 This is a schematic diagram of the escapement mechanism in this invention; Figure 4 This is a top view of the escapement mechanism in this invention; Figure 5 This is a schematic diagram of the high-pressure box of the escapement mechanism in this invention; Figure 6 This is a schematic diagram of the structure of the gas wellhead in this invention; Figure 7 This is a schematic diagram of the wind and solar power supply system in this invention.

[0020] In the diagram: 1. Continuous foaming agent injection system at the wellhead; 2. Continuous defoaming agent injection system at the wellhead; 3. Gas wellhead; 4. Wind and solar power supply system; 5. Control system; 6. Atmospheric pressure storage tank; 7. High-pressure pump; 8. High-pressure buffer tank; 9. Electric three-way valve; 10. Piston rod pressure-changing sealing cylinder; 11. Counterweight sealing cylinder; 12. Hydraulic cylinder; 13. Liquid suction check valve; 14. Liquid discharge check valve; 15. Piston; 16. Piston rod; 17. Counterweight; 18. Escapement mechanism; 19. Electrical control box; 20. Rod chamber; 21. Rodless chamber; 22. Liquid level sensor; 23. Liquid level switch; 24. Magnetic sensor; 25. Electromagnetic pulse controller; 26. 1. Housing; 27. Partition; 28. High-pressure box; 29. ​​Atmospheric pressure box; 30. Drive shaft; 31. Sprocket; 32. Drive gear; 33. Overrunning clutch; 34. Driven shaft; 35. Driven gear; 36. Ratchet; 37. Electromagnetic coil; 38. Connecting rod; 39. Spring; 40. Escape fork; 41. Small four-way valve of gas source tree; 42. Large four-way valve of gas source tree; 43. Production pipeline; 44. Hydraulic device; 45. Right wing plug; 46. Sleeve pressure device; 47. Inverter; 48. Solar controller; 49. Wind power controller; 50. Battery pack; 51. Wind turbine; 52. Photovoltaic panel; 53. RTU remote monitoring and control terminal. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: like Figure 1 As shown, the system includes a continuous wellhead foaming agent injection system 1 and a continuous wellhead defoaming agent injection system 2. The continuous wellhead foaming agent injection system 1 and the continuous wellhead defoaming agent injection system 2 have the same structure and principle. Both systems are connected to the gas wellhead 3 through pipelines. The continuous wellhead foaming agent injection system 1 and the continuous wellhead defoaming agent injection system 2 are connected to the wind and solar power supply system 4 through cables. The continuous wellhead foaming agent injection system 1, the continuous wellhead defoaming agent injection system 2 and the wind and solar power supply system 4 are respectively connected to the same control system 5.

[0023] This system includes a continuous wellhead foaming agent injection system 1 and a continuous wellhead defoaming agent injection system 2 for injecting foaming and defoaming agents into the gas wells to maintain the normal operation of the production process. Simultaneously, a wind and solar power supply system 4 utilizes wind and solar energy to power the system, reducing dependence on external energy sources and enabling independent operation. The control system 5 simplifies system operation, automating the injection process and making the injection work more convenient.

[0024] Example 2: Based on Example 1: like Figure 2As shown, both the wellhead continuous foaming agent injection system 1 and the wellhead continuous defoaming agent injection system 2 include an atmospheric pressure storage tank 6. The atmospheric pressure storage tank 6 has an inlet and a return outlet at the top and a drain outlet at the bottom. The drain outlet of the atmospheric pressure storage tank 6 is connected to a high-pressure pump 7 and a high-pressure buffer tank 8 in sequence through pipelines. The top of the high-pressure buffer tank 8 is connected to a balance pipe and connected to the gas wellhead 3. The high-pressure buffer tank 8 has two outlets. One outlet is connected to an electric three-way valve 9 via a pipe. The other two ports of the electric three-way valve 9 are connected to the piston rod pressure-changing sealing cylinder 10 and the return port of the atmospheric pressure storage tank 6 via pipes, respectively. The other outlet of the high-pressure buffer tank 8 is connected to a counterweight sealing cylinder 11 via a pipe. A hydraulic cylinder 12 is fixedly connected between the counterweight sealing cylinder 11 and the piston rod pressure-changing sealing cylinder 10, and the hydraulic cylinder 12 and the piston rod pressure-changing sealing cylinder 10 are located on the same axis. A suction check valve 13 is fixedly connected to the connecting pipe between the counterweight sealing cylinder 11 and the high-pressure buffer tank 8 and is connected to the hydraulic cylinder 12. A discharge check valve 14 is fixedly connected to the surface of the hydraulic cylinder 12, and both the suction check valve 13 and the discharge check valve 14 are located on the side close to the piston rod pressure-changing sealing cylinder 10. The discharge check valve 14 is connected to the gas wellhead 3 via a pipe. A sliding valve is connected inside the hydraulic cylinder 12. The piston 15 is sealed, and a piston rod 16 is fixedly connected to the side of the piston near the piston rod pressure-transformer sealing cylinder 10. The piston rod 16 extends into the piston rod pressure-transformer sealing cylinder 10, and the connection between the piston rod 16, the piston rod pressure-transformer sealing cylinder 10, and the hydraulic cylinder 12 is in a dynamic sealing state. A counterweight 17 is fixedly connected to the other side of the piston 15 via a chain, and the counterweight 17 is located inside the counterweight sealing cylinder 11. An escapement mechanism 18 is fixedly connected to the connection between the counterweight sealing cylinder 11 and the hydraulic cylinder 12, and the chain meshes with the sprocket of the escapement mechanism 18. The electric three-way valve 9 and the high-pressure pump 7 are both connected to the same electrical control box 19 via cables, and the electrical control box 19 is connected to the wind and solar power supply system 4 and the control system 5 via cables, respectively. The piston 15 divides the hydraulic cylinder 12 into two chambers, of which the chamber near the counterweight sealing cylinder 11 is the rod chamber 20, and the chamber near the counterweight sealing cylinder 11 is the rodless chamber 21.

[0025] The high-pressure pump 7 is a three-cylinder plunger pump, whose discharge pressure is greater than the maximum wellhead pressure of the gas production well; A magnetic ring is fixedly connected to the outside of piston 15.

[0026] The volume of the atmospheric pressure storage tank 6 is equal to the volume of the foaming agent or defoamer used in the gas well for ten to thirty days. At the same time, the discharge capacity of the high pressure pump 7 meets the requirement that the volume of foaming agent or defoamer used in the gas well for one day can be transferred into the high pressure buffer tank 8 in one to five hours.

[0027] When the piston rod pressure-changing sealing cylinder 10 is under normal pressure, the pressure in the rodless chamber 21 of the hydraulic cylinder 12 is greater than the sum of the pressure in the rod chamber 20 of the hydraulic cylinder 12 and the weight of the counterweight 17, which can drive the piston 15 to move towards the piston rod pressure-changing sealing cylinder 10.

[0028] High-pressure pump 7 is used to increase the pressure of the reagent, allowing it to smoothly enter the gas production well. The balance pipe of high-pressure buffer tank 8 is used to regulate the pressure at the gas production wellhead 3, preventing the pressure at the gas production wellhead 3 from rising due to the continuous injection of foaming agent and defoamer.

[0029] The piston rod pressure-changing sealing cylinder 10, the counterweight sealing cylinder 11, and the hydraulic cylinder cylinder 12 are balanced by a high-pressure agent. During operation, both sides of the piston 15 are subjected to continuous liquid pressure. However, the side of the piston 15 closest to the piston rod pressure-changing sealing cylinder 10 is smaller than the side closest to the counterweight sealing cylinder 11 because it is connected to the piston rod 16. Therefore, when both sides of the piston 15 are filled with high-pressure liquid of the same pressure, the pressure on the rod chamber 20 side is less than the pressure on the rodless chamber 21 side. However, when the piston rod pressure-changing sealing cylinder 10 is also filled with high-pressure agent, the piston rod 16 is also subjected to the pressure of the high-pressure agent. At this time, the pressure on both sides of the piston 15 is equal. Driven by the counterweight 17, the piston 15 moves towards the counterweight sealing cylinder 11 side.

[0030] When the piston rod pressure-changing sealing cylinder 10 is under normal pressure, the pressure of the high-pressure agent in the rodless chamber 21 on the piston 15 is greater than the pressure of the piston in the rod chamber 20 plus the gravity of the counterweight 17. At this time, the piston 15 moves towards the rod chamber 20, squeezing the high-pressure agent in the rod chamber 20 out of the hydraulic cylinder 12 through the drain check valve 14, thus completing the addition of the agent.

[0031] After the agent is added, the electric three-way valve 9 re-injects high-pressure agent into the piston rod pressure-changing sealing cylinder 10. Under the pressure of the agent and the gravity of the counterweight 17, the piston 15 moves towards the rodless chamber 21. At this time, due to the increase in volume of the rod chamber 20, its internal pressure decreases. Under the action of pressure, the high-pressure agent enters the rod chamber 20 through the liquid suction check valve 13.

[0032] Example 3: Based on Example 2: like Figure 2As shown, a liquid level sensor 22 is fixedly connected to the bottom of the inner wall of the atmospheric pressure storage tank 6, and the liquid level sensor 22 is connected to the electrical control box 19 through a cable. A liquid level switch 23 is provided at the top and bottom of the inner wall of the high pressure buffer tank 8, and both liquid level switches 23 are connected to the electrical control box 19 through cables. A magnetic force sensor 24 is fixedly connected to one end of the outer wall of the hydraulic cylinder 12 near the piston rod pressure transformer sealing cylinder 10 and the counterweight sealing cylinder 11, and both magnetic force sensors 24 are connected to the electrical control box 19 through cables. An electromagnetic pulse controller 25 is fixedly connected to the outer wall of the escapement mechanism 18, and the electromagnetic pulse controller 25 is connected to the electrical control box 19 through a cable.

[0033] The liquid level sensor 22 inside the atmospheric pressure storage tank 6 can detect the liquid content in the tank. When the liquid level drops to a certain height, the liquid level sensor 22 sends an alarm to the control system 5 to remind the staff to add the medicine in time.

[0034] All level switches 23 inside the high-pressure buffer tank 8 detect the liquid level. When the liquid level exceeds the level switch 23 located at the top of the tank, the level switch 23 sends a signal to the control system 5, stopping the high-pressure pump 7 and driving the electric three-way valve 9 to perform liquid injection. When the liquid level drops to the level switch 23 located at the bottom of the high-pressure buffer tank 8, it indicates that the injection in the tank is insufficient. The level switch 23 sends a signal to the control system 5, which then injects high-pressure agent into the high-pressure buffer tank 8 via the high-pressure pump 7, or stops the system operation.

[0035] The magnetic sensor 24 on the outer wall of the hydraulic cylinder 12 can detect the position of the piston 15 inside the hydraulic cylinder 12. When the piston 15 is located near the end of the counterweight sealing cylinder 11, it indicates that the rod chamber 20 is full of high-pressure agent. At this time, the corresponding magnetic sensor 24 sends a signal to the control system 5. The control system 5 controls the electrical control box 19 to drive the electric three-way valve 9 to connect the piston rod pressure transformer sealing cylinder 10 and the atmospheric pressure reservoir 6, emptying the high-pressure agent in the piston rod pressure transformer sealing cylinder 10. At the same time, the electromagnetic pulse controller 25 drives the escapement mechanism 18 to operate and inject the agent. When the piston 15 moves to the end of the hydraulic cylinder 12 near the piston rod pressure transformer sealing cylinder 10, the corresponding magnetic sensor 24 sends a signal to the control system 5. The control system 5 controls the electrical control box 19 to control the electric three-way valve 9 to connect the piston rod pressure transformer sealing cylinder 10 and the high-pressure buffer tank 8 to re-inject high-pressure agent into the piston rod pressure transformer sealing cylinder 10, driving the piston 15 to move towards the rodless chamber 21 side, preparing for the next injection.

[0036] The electromagnetic pulse controller 25 can emit electromagnetic pulses to control the operation of the escapement mechanism 18, and the frequency of the electromagnetic pulses can be adjusted through the control system 5.

[0037] Example 4: Based on Example 2: like Figure 3 , Figure 4 and Figure 5 As shown, the escapement mechanism 18 includes a housing 26 fixedly connected between the counterweight sealing cylinder 11 and the hydraulic cylinder 12. A partition 27 is fixedly connected inside the housing 26, dividing it into a high-pressure chamber 28 and an atmospheric-pressure chamber 29. The high-pressure chamber 28 communicates with the counterweight sealing cylinder 11 and the hydraulic cylinder 12. A drive shaft 30, penetrating the partition 27, is fixedly connected inside the housing 26, and the connection between the drive shaft 30 and the partition 27 is sealed. A sprocket 31 is fixedly connected to a section of the drive shaft 30, and the sprocket 31 meshes with a hinge. A drive gear 32 is installed on the section of the drive shaft 30 located inside the atmospheric-pressure chamber 29. An overrunning clutch is fixedly connected to the drive shaft 30. The drive gear 32 is connected to the drive shaft 30 via the overrunning clutch 33. A driven shaft 34 parallel to the drive shaft 30 is fixedly connected inside the atmospheric pressure chamber 29. A driven gear 35 and a ratchet 36 are fixedly connected side by side on the driven shaft 34, and the driven gear 35 meshes with the drive gear 32. An electromagnetic coil 37 is fixedly connected to the inner wall of the atmospheric pressure chamber 29, and the electromagnetic coil 37 is electrically connected to the electromagnetic pulse controller 25. A connecting rod 38 and a spring 39 are sequentially provided at one end of the electromagnetic coil 37, and the spring 39 is fixedly connected to the inner wall of the atmospheric pressure chamber 29. An escape fork 40 is fixedly connected at the connection between the spring 39 and the connecting rod 38, and the escape fork 40 meshes with the ratchet 36.

[0038] The electromagnetic pulse controller 25 is electrically connected to the electromagnetic coil 37. After receiving a pulse current, the electromagnetic coil 37 will periodically generate a magnetic force. When the electromagnetic coil 37 generates a magnetic force, the connecting rod 38 is attracted to the electromagnetic coil 37, and the spring 39 is stretched. At this time, the escape fork 40 engages with the ratchet 36, preventing the ratchet 36 from rotating. When the electromagnetic coil 37 has no magnetic force, the connecting rod 38 returns to its original position under the action of the spring force of the spring 39. At this time, the escape fork 40 disengages from the ratchet 36, allowing the ratchet 36 to rotate freely.

[0039] During the injection process, piston 15 moves towards the rod chamber 20 under the influence of pressure differential. During this process, piston 15 drives sprocket 31 to rotate via a hinge, and sprocket 31 transmits the rotation to drive gear 32 via drive shaft 30. When electromagnetic coil 37 has no magnetic force, the rotation of drive gear 32 is unrestricted, and piston 15 can move. However, when electromagnetic coil 37 generates magnetic force, escape fork 40 restricts ratchet 36 from rotating, and driven gear 35, coaxial with ratchet 36, also cannot rotate, thus restricting the rotation of drive gear 32 and stopping piston 15. The movement of piston 15 is regulated by electromagnetic pulses, thereby achieving drug dripping. The dripping speed can also be adjusted by regulating the frequency of the electromagnetic pulses.

[0040] After the injection is completed, the electric three-way valve 9 injects high-pressure agent into the piston rod pressure-transformer sealing cylinder 10, driving the piston 15 to move towards the rodless chamber 21. During this process, the overrunning clutch 33 actively disengages the connection between the drive gear 32 and the drive shaft 30, allowing the sprocket 31 to rotate freely, thereby enabling the piston 15 to move quickly and replenish the high-pressure agent, facilitating the next injection operation.

[0041] Example 5: Based on Example 2: like Figure 1 and Figure 6 As shown, the gas wellhead 3 includes a small four-way valve 41 and a large four-way valve 42 of the gas tree, and the two are connected by a pipeline. One side of the small four-way valve 41 of the gas tree is connected to the production pipeline 43, and the other side is connected to the hydraulic device 44. The production pipeline 43 is connected to the drain check valve 14 in the continuous defoamer injection system 2 at the wellhead, and the hydraulic device 44 is connected to the high-pressure buffer tank 8 in the continuous defoamer injection system 2 at the wellhead. The gas production tree's four-way connector 42 is connected to a right wing plug 45 on one side and a casing pressure device 46 on the opposite side. The right wing plug 45 is connected to the high-pressure buffer tank 8 in the wellhead continuous foaming agent injection system 1, and the casing pressure device 46 is connected to the drainage check valve 14 in the wellhead continuous foaming agent injection system 1.

[0042] Example 6: Based on Example 2: like Figure 7 The wind and solar power supply system 4 includes an inverter 47 connected to two electrical control boxes 19. The inverter 47 is connected to a solar controller 48 and a wind power controller 49 via cables. The solar controller 48, the wind power controller 49 and the inverter 47 are all connected to the same battery pack 50. The wind power controller 49 is connected to a wind turbine 51 via cables. The solar controller 48 is connected to a photovoltaic panel 52 via cables.

[0043] This system collects solar and wind energy through photovoltaic panels 52 and wind turbines 51 to provide energy for the operation of various electronic components within the system. At the same time, the battery pack 50 stores the electrical energy generated by the photovoltaic panels 52 and wind turbines 51, which can power the system when necessary, thus compensating for the characteristics of wind and solar power generation being greatly affected by the external environment and having unstable power generation.

[0044] Example 7: Based on Example 6: like Figure 1 and Figure 7 As shown, the control system 5 includes an RTU remote monitoring and control terminal 53 connected to the inverter 47, the solar controller 48, the wind power controller 49, and the electrical control box 19.

[0045] The RTU Remote Measurement and Control Terminal 53 is a special computer measurement and control unit with a modular structure designed for long communication distances and harsh industrial environments, which can meet the testing needs of mining sites.

[0046] This system stores the reagents in an atmospheric pressure storage tank 6, and then pressurizes the high-pressure reagents in a high-pressure pump 7 before sending them to a high-pressure buffer tank 8 for storage. While meeting the pressure requirements for injection into the gas production well, the system also utilizes the pressure of the high-pressure reagents to achieve injection, thereby reducing the overall energy consumption of the system and adapting to the unstable characteristics of solar and wind power functions.

[0047] Working principle: Wind and solar power generation: This system converts solar energy into electrical energy through photovoltaic panels 52 and wind energy into electrical energy through wind turbines 51, providing power for the operation of various electronic components within the system. Since the utilization of wind and solar energy is severely affected by weather conditions, a stable power output cannot be guaranteed. Therefore, this system includes a high-pressure pump 7 and a high-pressure buffer tank 8. When the photovoltaic panels 52 and wind turbines 51 generate sufficient power, the high-pressure pump 7 is activated in real time to pressurize the reagent, converting electrical energy into pressure energy and transporting it to the high-pressure buffer tank 8 for storage. A battery bank 50 is also included to store only a small amount of electrical energy. The energy from the high-pressure buffer tank 8 powers the continuous operation of the piston 15 and escapement mechanism 18, while the stored electrical energy from the battery bank supplies power to the system. This allows the system to operate independently and continuously without relying on external energy sources.

[0048] Injection principle: After the atmospheric pressure storage tank 6 is filled with the agent, the high pressure pump 7 increases the agent pressure and sends it into the high pressure buffer tank 8. It then enters the counterweight sealing cylinder 11, the high pressure box of the escapement mechanism 18, and the rodless chamber 21 of the hydraulic cylinder through the pipeline. The outlet of the high pressure buffer tank 8 and the piston rod pressure changing sealing cylinder 10 are connected by the electric three-way valve 9, so that the piston rod pressure changing sealing cylinder 10 is filled with high pressure agent. At the same time, the overrunning clutch 33 disconnects the connection between the drive shaft 30 and the drive gear 32. At this time, the high pressure agent enters the rod chamber 20 from the suction check valve 13. The pressure on both sides of the piston 15 is equal. Under the gravity of the counterweight 17, the piston 15 moves to the rodless chamber 21 until the rear end cover position, completing the addition of agent to the rod chamber 20.

[0049] When the magnetic sensor 24 detects that the piston 15 has moved to the rear end cover position of the hydraulic cylinder 12, the electrical control box 19 sends a signal to control the electric three-way valve 9 to connect the piston rod pressure-changing sealing cylinder 10 and the atmospheric pressure storage tank 6, so that the pressure inside the piston rod pressure-changing sealing cylinder 10 becomes atmospheric pressure. Since the pressure on the piston rod 16 is reduced to atmospheric pressure, while the pressure on the other side of the piston 15 remains unchanged, under the action of the pressure difference, the piston moves towards the rod chamber 20 side, squeezing the high-pressure agent from the discharge check valve 14 and sending it into the gas wellhead 3. As piston 15 moves, overrunning clutch 33 connects drive shaft 30 and drive gear 32, causing sprocket 31 to rotate. At this time, electromagnetic coil 37 periodically generates magnetic force, which, through connecting rod 38, spring 39, and escape fork 40, periodically restricts the rotation of ratchet 36. When ratchet 36 is restricted and cannot rotate, drive gear 32 is also restricted and cannot rotate, thus preventing piston 15 from moving. Conversely, when ratchet 36 is unrestricted, drive gear 32 can rotate freely, and piston 15's movement is unrestricted. By restricting the movement of piston 15, the amount of medicine added can be precisely controlled.

[0050] Control principle: During the injection process, the liquid level sensor 22 in the atmospheric pressure storage tank 6 detects the liquid level of the medicine in the tank in a timely manner. When the medicine is insufficient, the liquid level sensor 22 sends a signal through the electrical control box 19 to remind the staff to add medicine or stop the operation of the system.

[0051] During the injection process, the inverter 47, solar controller 48, and wind power controller 49 control the voltage to activate the high-pressure pump 7 in real time, transferring the liquid from the atmospheric pressure storage tank 6 to the high-pressure buffer tank 8. A level switch 23 at the top of the high-pressure buffer tank 8 continuously monitors whether the tank is full of high-pressure reagent. When the liquid level in the high-pressure buffer tank 8 is higher than the level switch 23 at the top, the switch sends a signal to the control box 19 to stop the high-pressure pump. When the liquid level in the high-pressure buffer tank 8 is lower than the level switch 23 at the bottom, the switch sends a signal to the control box 19 to either drive the high-pressure pump 7 to add high-pressure reagent to the high-pressure buffer tank or to stop the system.

[0052] During the injection process, two magnetic sensors 24 outside the hydraulic cylinder 12 detect the position of the piston 15. When the piston 15 is located inside the hydraulic cylinder 12 near the piston rod pressure-changing sealing cylinder 10, the electric three-way valve 9 is switched by the electrical control box 19, causing the piston 15 to move towards the rodless chamber 21, filling the rod chamber 20 with high-pressure reagent. When the piston 15 is located inside the hydraulic cylinder 12 near the counterweight sealing cylinder 11, the electric three-way valve 9 is switched by the electrical control box 19, causing the piston 15 to move towards the rod chamber 20, delivering the high-pressure reagent in the rod chamber 20 into the gas wellhead 3.

[0053] During the injection process, remote control commands issued by the RTU remote monitoring and control terminal 53 can be used to change the electromagnetic pulse frequency of the electromagnetic pulse controller 25, thereby adjusting the amount of high-pressure agent during a single drip and making the dosage of the agent more accurate.

[0054] During the injection process, the RTU remote monitoring and control terminal connects to clients such as computers and mobile phones via network and cloud platform to realize remote data acquisition, parameter setting, and remote control command issuance. The lower-level communication port uses RS485 communication to connect to the data acquisition and output module communication port of the electrical control box 19, the data acquisition and control communication port of the solar controller 48 and the wind power controller 49. The on-site operation parameters are monitored in real time, and the on-site equipment program is controlled, data is reported, and fault alarms and handling are performed based on the monitoring data, set parameters or remote commands.

Claims

1. A continuous injection system for gas wellheads powered by wind and solar hybrid power, characterized in that, It includes a continuous wellhead foaming agent injection system (1) and a continuous wellhead defoaming agent injection system (2). The continuous wellhead foaming agent injection system (1) and the continuous wellhead defoaming agent injection system (2) have the same structure and principle. Both systems are connected to the gas wellhead (3) through pipelines. The continuous wellhead foaming agent injection system (1) and the continuous wellhead defoaming agent injection system (2) are connected to the wind and solar power supply system (4) through cables. The continuous wellhead foaming agent injection system (1), the continuous wellhead defoaming agent injection system (2) and the wind and solar power supply system (4) are respectively connected to the same control system (5).

2. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 1, characterized in that, Both the wellhead continuous foaming agent injection system (1) and the wellhead continuous defoaming agent injection system (2) include an atmospheric pressure storage tank (6). The atmospheric pressure storage tank (6) has an inlet and a return outlet at the top and a drain outlet at the bottom. The drain outlet of the atmospheric pressure storage tank (6) is connected to a high-pressure pump (7) and a high-pressure buffer tank (8) in sequence through a pipeline. The top of the high-pressure buffer tank (8) is connected to a balance pipe and connected to the gas wellhead (3). The high-pressure buffer tank (8) has two outlets. One outlet is connected to an electric three-way valve (9) via a pipe. The other two ports of the electric three-way valve (9) are connected to a piston rod pressure-changing sealing cylinder (10) and a return port of the atmospheric pressure storage tank (6) via pipes, respectively. The other outlet of the high-pressure buffer tank (8) is connected to a counterweight sealing cylinder (11) via a pipe. A hydraulic cylinder (12) is fixedly connected between the counterweight sealing cylinder (11) and the piston rod pressure-changing sealing cylinder (10), and the hydraulic cylinder (12) and the piston... The piston rod pressure-changing sealing cylinder (10) is located on the same axis. A liquid suction check valve (13) is fixedly connected to the connecting pipe of the counterweight sealing cylinder (11) and the high-pressure buffer tank (8), and is connected to the hydraulic cylinder (12). A liquid discharge check valve (14) is fixedly connected to the surface of the hydraulic cylinder (12), and both the liquid suction check valve (13) and the liquid discharge check valve (14) are located on the side close to the piston rod pressure-changing sealing cylinder (10). The liquid discharge check valve (14) is connected to the gas wellhead (3) through a pipe. The hydraulic cylinder (12) is slidably connected inside. A piston (15) with an interference fit is provided, and a piston rod (16) is fixedly connected to the side of the piston near the piston rod pressure-changing sealing cylinder (10). The piston rod (16) extends into the piston rod pressure-changing sealing cylinder (10), and the connection between the piston rod (16) and the piston rod pressure-changing sealing cylinder (10) and the hydraulic cylinder (12) is in a dynamic sealing state. A counterweight (17) is fixedly connected to the other side of the piston (15) by a hinge, and the counterweight (17) is located in the counterweight sealing cylinder (11). The counterweight sealing cylinder (11) and the hydraulic cylinder (12) are connected to the piston rod pressure-changing sealing cylinder (10) and the hydraulic cylinder (12). 2) The connection is fixedly connected to the escapement mechanism (18), and the hinge engages with the escapement mechanism (18). The electric three-way valve (9) and the high-pressure pump (7) are both connected to the same electrical control box (19) via cables. The electrical control box (19) is connected to the wind and solar power supply system (4) and the control system (5) via cables. The piston (15) divides the hydraulic cylinder (12) into two chambers, of which the chamber near the counterweight sealing cylinder (11) is the rod chamber (20) and the chamber near the counterweight sealing cylinder (11) is the rodless chamber (21).

3. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 2, characterized in that, The high-pressure pump (7) is a three-cylinder plunger pump, and its discharge pressure is greater than the maximum wellhead pressure of the gas production well. A magnetic ring is fixedly connected to the outside of the piston (15).

4. The continuous injection system for gas wellheads powered by wind and solar hybrid power as described in claim 2, characterized in that, When the piston rod pressure-changing sealing cylinder (10) is under normal pressure, the pressure in the rodless chamber (21) of the hydraulic cylinder (12) is greater than the sum of the pressure in the rod chamber (20) of the hydraulic cylinder (12) and the weight of the counterweight (17), which can drive the piston (15) to move towards the piston rod pressure-changing sealing cylinder (10).

5. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 2, characterized in that, A liquid level sensor (22) is fixedly connected to the bottom of the inner wall of the atmospheric pressure storage tank (6), and the liquid level sensor (22) is connected to the electrical control box (19) through a cable. A liquid level switch (23) is provided at the top and bottom of the inner wall of the high pressure buffer tank (8), and both liquid level switches (23) are connected to the electrical control box (19) through cables. A magnetic force sensor (24) is fixedly connected to one end of the outer wall of the hydraulic cylinder (12) near the piston rod pressure transformer sealing cylinder (10) and the counterweight sealing cylinder (11), and both magnetic force sensors (24) are connected to the electrical control box (19) through cables. An electromagnetic pulse controller (25) is fixedly connected to the outer wall of the escapement mechanism (18), and the electromagnetic pulse controller (25) is connected to the electrical control box (19) through a cable.

6. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 5, characterized in that, The escapement mechanism (18) includes a housing (26) fixedly connected between the counterweight sealing cylinder (11) and the hydraulic cylinder (12). A partition (27) is fixedly connected inside the housing (26), dividing the housing (26) into a high-pressure chamber (28) and an atmospheric pressure chamber (29). The high-pressure chamber (28) is connected to the counterweight sealing cylinder (11) and the hydraulic cylinder (12). A drive shaft (30) is fixedly connected inside the housing (26) through the partition (27), and the connection between the drive shaft (30) and the partition (27) is sealed. A sprocket (31) is fixedly connected to a section of the drive shaft (30), and the sprocket (31) meshes with a hinge. A drive gear (32) is provided on a section of the drive shaft (30) inside the atmospheric pressure chamber (29). An overrunning clutch is fixedly connected to the drive shaft (30). The device (33) has a drive gear (32) connected to the drive shaft (30) via an overrunning clutch (33). The atmospheric pressure chamber (29) has a driven shaft (34) that is parallel to the drive shaft (30). A driven gear (35) and a ratchet (36) are fixedly connected side by side on the driven shaft (34). The driven gear (35) meshes with the drive gear (32). An electromagnetic coil (37) is fixedly connected to the inner wall of the atmospheric pressure chamber (29). The electromagnetic coil (37) is electrically connected to the electromagnetic pulse controller (25). A connecting rod (38) and a spring (39) are sequentially provided at one end of the electromagnetic coil (37). The spring (39) is fixedly connected to the inner wall of the atmospheric pressure chamber (29). An escape fork (40) is fixedly connected at the connection between the spring (39) and the connecting rod (38). The escape fork (40) meshes with the ratchet (36).

7. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 2, characterized in that, The gas wellhead (3) includes a small four-way valve (41) and a large four-way valve (42) of the gas tree, and the two are connected by a pipeline. One side of the small four-way valve (41) is connected to a production pipeline (43), and the other side is connected to a hydraulic device (44). The production pipeline (43) is connected to the drain check valve (14) in the continuous defoamer injection system (2) at the wellhead. The hydraulic device (44) is connected to the high-pressure buffer tank (8) in the continuous defoamer injection system (2) at the wellhead. The gas production tree four-way connector (42) is connected to a right wing plug (45) on one side and a casing pressure device (46) on the opposite side. The right wing plug (45) is connected to the high pressure buffer tank (8) in the wellhead continuous foaming agent injection system (1), and the casing pressure device (46) is connected to the drain check valve (14) in the wellhead continuous foaming agent injection system (1).

8. The continuous injection system for gas wellheads with wind-solar hybrid power supply according to claim 2, characterized in that, The wind and solar power supply system (4) includes an inverter (47) connected to two electrical control boxes (19). The inverter (47) is connected to a solar controller (48) and a wind power controller (49) via cables. The solar controller (48), the wind power controller (49) and the inverter (47) are all connected to the same battery pack (50). The wind power controller (49) is connected to a wind turbine (51) via cables. The solar controller (48) is connected to a photovoltaic panel (52) via cables.

9. The continuous injection system for gas wellheads using wind-solar hybrid power supply according to claim 8, characterized in that, The control system (5) includes an RTU remote control terminal (53) connected to the inverter (47) and two electrical control boxes (19).

10. A wellhead injection method, characterized in that, The application of the continuous injection system at the gas wellhead according to any one of claims 1 to 9 shall be carried out in accordance with the following steps: Step 1: Add defoamer and foaming agent to the wellhead continuous defoamer injection system (2) and the wellhead continuous foaming agent injection system (1), respectively; Step 2: Start the system to inject the agent through the control system (5).

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