Ultrahigh-pressure large-displacement nitrogen foam generator

Abstract

The invention discloses an ultrahigh-pressure large-displacement nitrogen foam generator, and belongs to the technical field of oil field foam fluid. An ultrahigh-pressure large-displacement nitrogen foam generator comprises a generator body, a base is fixedly installed on the inner bottom face of the generator body, a mixing box is fixedly installed on the surface of the base, a rotating ring is fixedly installed on the inner bottom face of the mixing box, and a hollow pipe sealed with the rotating ring is rotationally connected into the rotating ring. A stirring device is fixedly mounted on the bottom surface of the hollow pipe. Compared with a traditional mixing device, the ultrahigh-pressure large-displacement nitrogen foam generator has the advantages that the mixing device enables mixed liquid to quickly generate foam, the amount of the foam generated by the generator body is increased, and the spraying head blows air to the mixed liquid in the mixing box, so that the formed nitrogen foam is small and is not easy to break; the foam production efficiency of the generator body is improved, the treatment speed of an oil well is increased, and then the oil exploitation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield foam fluid, and more specifically to an ultra-high pressure and large displacement nitrogen foam generator. Background Art

[0002] A foam generator is a device used to generate foam and is widely used in oilfield well washing construction. Oilfield foam generators usually generate foam by mixing gas and liquid. These foams can be used to improve oil and gas recovery rates, clean wellbores, and other purposes.

[0003] Chinese patent application number CN201710840393.0 provides a foam generator, comprising: a hollow tubular main body portion, a cement slurry inlet portion and a gas inlet portion spaced apart in the axial direction are arranged at one end of the main body portion, a mixing foaming chamber arranged in the main body portion, used to mix and foam the cement slurry and gas from the cement slurry inlet portion and the gas inlet portion, a foam homogenizer arranged in the main body portion, used to homogenize the foam fluid from the mixing foaming chamber, and a foam cement slurry outlet portion for connecting a cementing pipeline arranged at the other end of the main body portion.

[0004] In the above technical solution, the foam generator utilizes the dual injection of gas and slurry for foaming, and cooperates with a homogenizer, which not only enhances the foaming effect, but also improves its foaming efficiency. Although the traditional foam generator is equipped with a mixing device, when nitrogen and the foaming agent are stirred and mixed, bubbles are only generated by simple stirring blades, which not only leads to a longer nitrogen foam generation time, but also causes the generated foam to be larger and easier to break, affecting the foaming efficiency of the foam generator, and further affecting the efficiency of oil extraction. Summary of the invention

[0005] The purpose of the present invention is to provide an ultra-high pressure and large displacement nitrogen foam generator to solve the problems raised in the above background technology: In order to achieve the above object, the present invention provides the following technical solutions: An ultra-high pressure and large displacement nitrogen foam generator, comprising a generator body, a base is fixedly installed on the inner bottom surface of the generator body, a mixing box is fixedly installed on the surface of the base, a swivel is fixedly installed on the inner bottom surface of the mixing box, a hollow tube sealed therewith is rotatably connected inside the swivel, a stirring device is fixedly installed on the bottom surface of the hollow tube, a plurality of air baffles are arranged in a circular array on the middle surface of the hollow tube, two groups of retractable injection devices are arranged between the stirring device and the air baffle, the two groups of injection devices are arranged in a circular array on the surface of the hollow tube, any one of the injection devices is connected to the hollow tube, an arc block corresponding to the position of the injection device is fixedly installed on the inner wall of the mixing box, and the arc block is used to assist the extension and retraction of the injection device; The spraying device comprises a fixed pipe which is fixedly connected to the surface of the hollow pipe and communicates with the hollow pipe, a telescopic pipe matching with the fixed pipe is slidably connected inside the fixed pipe, and a spray head communicating with the telescopic pipe is fixedly installed on the surface of the telescopic pipe.

[0006] By adopting the above technical scheme, the foaming liquid enters the mixing box through the foaming liquid inlet pipe, and the nitrogen enters the bottom of the mixing box through the nitrogen inlet pipe. During the process of nitrogen passing through the nitrogen inlet pipe, the nitrogen is divided into two paths. The first path is that the nitrogen enters the gas collecting plate through the second gas branch pipe, and then blows through the three inclined pipes through the gas collecting plate, and then acts on the surface of the air baffle. At this time, the rotation of the air baffle brings the hollow tube to rotate, and the stirring device follows the rotation of the hollow tube to stir the foaming liquid and nitrogen mixture. The second path is that the nitrogen enters the inside of the hollow tube through the first gas branch pipe. At this time, the nitrogen inside the hollow tube is blown to the mixed liquid inside the mixing box through the fixed tube, the telescopic tube and the injection head, so that the nitrogen is blown inside the mixed liquid. Compared with the traditional mixing The mixing device not only enables the mixed liquid to generate foam quickly, but also increases the amount of foam generated by the generator body. In addition, the injection head blows air into the mixed liquid inside the mixing box to form nitrogen foam bubbles that are smaller and not easy to break, thereby improving the foaming efficiency of the generator body, accelerating the processing speed of the oil well, and further improving the efficiency of oil extraction. The rotation of the hollow tube also moves the fixed tube, the telescopic tube, the injection head, the fixed rod and the ball head. When the ball head is squeezed by the arc block, the fixed rod moves with the injection head and the telescopic tube toward the inside of the fixed tube, so that the injection head rotates and telescopes at the same time, and then the injection head discharges nitrogen at different positions in the mixed liquid, further improving the efficiency of the generator body to generate foam.

[0007] Preferably, a fixing rod is fixedly installed on the surface of the injection head, a ball head in contact with the arc block is fixedly installed on the surface of one end of the fixing rod, a fixing ring is fixedly connected to the inner wall of the fixing tube, a spring is elastically connected between the fixing ring and the telescopic tube, one end of the spring is fixedly connected to the end surface of the telescopic tube, and the other end of the spring is fixedly connected to the surface of the fixing ring.

[0008] By adopting the above technical solution, the spring is used for resetting the telescopic tube movement.

[0009] Preferably, a nitrogen inlet pipe and a foaming liquid inlet pipe connected to the mixing box are fixedly installed on the corresponding end surface of the mixing box, a fixing seat is fixedly installed on the inner top surface of the mixing box, the bottom surface of the fixing seat is rotatably connected to the hollow tube, the hollow tube and the bottom surface of the fixing seat are sealed, a first air distribution pipe is fixedly installed inside the fixing seat, one end of the first air distribution pipe is connected to the hollow tube, the other end of the first air distribution pipe is connected to the nitrogen inlet pipe, one end of the nitrogen inlet pipe extends to the interior of the mixing box, and the port is located close to the inner bottom surface of the mixing box.

[0010] By adopting the above technical solution, the hollow tube rotates between the swivel and the fixed seat, and the swivel and the fixed seat ensure the sealing of the hollow tube to prevent the bubble liquid from entering the hollow tube.

[0011] Preferably, three oblique tubes connected to the mixing box are fixedly installed on the surface thereof, the oblique tubes are inclined, and the ports of the oblique tubes correspond to the positions of the air baffles, and one ends of the three oblique tubes are commonly fixedly installed with an air collecting plate connected to them, and a second air distribution pipe connected to the air collecting plate is fixedly installed on the bottom surface of the air collecting plate, and one end of the second air distribution pipe is connected to the nitrogen inlet pipe.

[0012] By adopting the above technical solution, the extension pipe of the nitrogen inlet pipe inside the mixing box will not affect the movement of the stirring device, the air baffle, the fixing rod and the ball head. The angle of the inclined pipe is set to better act the airflow on the surface of the air baffle, so that the air baffle rotates under the action of wind.

[0013] Preferably, the surface of the mixing box is provided with groove one and groove two respectively, the nitrogen inlet pipe is connected with the mixing box through groove one, the foaming liquid inlet pipe is connected with the mixing box through groove two, the top surface of the mixing box is provided with groove three, and the first gas distribution pipe is connected with the hollow tube through groove three.

[0014] Preferably, a foam homogenizer is fixedly mounted on one side of the mixing box, a mixing foam outlet pipe is arranged between the foam homogenizer and the mixing box, one end of the mixing foam outlet pipe is connected to the mixing box, and the other end of the mixing foam outlet pipe is connected to the foam homogenizer, and an inclined guide plate is fixedly mounted on the outer surface of the swivel.

[0015] By adopting the above technical solution, the foam homogenizer homogenizes the larger nitrogen bubbles into fine nitrogen bubbles that are not easily broken.

[0016] Preferably, a connecting pipe connected to the foam homogenizer is fixedly installed on the surface, one end of the connecting pipe extends to the outside of the generator body, and a fixing block is fixedly installed at the port of the connecting pipe, a spray head is fixedly installed on the surface of the fixing block, a tee is provided on one side of the spray head, a pump truck connecting pipe connected to the tee is fixedly installed on the top surface of the tee, a pipe sleeve connecting pipe connected to the tee is fixedly installed on the bottom surface of the tee, and a nozzle sealing groove connected to the spray head is provided on the surface of the tee.

[0017] By adopting the above technical solution and setting the nozzle sealing groove, nitrogen foam can be prevented from overflowing.

[0018] Preferably, the inner wall of the fixed block is provided with an internal thread, a ring sleeve is fixedly installed on one end surface of the spray head, the outer surface of the ring sleeve is provided with an external thread matching the internal thread, and the spray head is fixedly connected to the fixed block by matching the external thread and the internal thread.

[0019] By adopting the above technical solution, the spray head can be installed on the surface of the fixed block more stably.

[0020] Preferably, an outlet cone head sealed with the nozzle sealing groove is fixedly mounted on the other end surface of the nozzle, and the nozzle is connected with the three-way pipe through the matching of the outlet cone head and the nozzle sealing groove.

[0021] Preferably, a plurality of arc plates are fixedly mounted on the inner wall of the ejection head, the plurality of arc plates are staggered in height, the arc plates are spiral arc plates, and a plurality of collision blocks are fixedly mounted on the surface of any one of the arc plates.

[0022] By adopting the above technical solution, when the foam mixture enters the ejection head, multiple arc rotating plates swirl the foam mixture and collide the foam mixture again, and a number of collision blocks are fixedly installed on the surface of the arc rotating plates, so that the foam mixture collides frequently, thereby compensating for the foam lost during the transportation process and ensuring that the stock of bubbles meets the requirements of deep well operations.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1) When the ultra-high pressure and large displacement nitrogen foam generator is in use, the foaming liquid enters the mixing box through the foaming liquid inlet pipe, and the nitrogen enters the bottom of the mixing box through the nitrogen inlet pipe. During the process of nitrogen passing through the nitrogen inlet pipe, the nitrogen is divided into two paths. The first path is that the nitrogen enters the gas collecting plate through the second gas distribution pipe, and then blows through the three inclined pipes through the gas collecting plate, and then acts on the surface of the air baffle. At this time, the air baffle rotates with the hollow tube to rotate. At this time, the stirring device follows the rotation of the hollow tube to stir the foaming liquid and nitrogen mixture. The second path is that the nitrogen enters through the first gas distribution pipe Inside the hollow tube, the nitrogen inside the hollow tube is blown to the mixed liquid inside the mixing box through the fixed tube, the telescopic tube and the injection head, so that the nitrogen is blown inside the mixed liquid. Compared with the traditional mixing device, the mixing device not only makes the mixed liquid generate foam quickly, but also increases the amount of foam generated by the generator body. In addition, the injection head blows the mixed liquid inside the mixing box to form nitrogen foam bubbles that are smaller and not easy to break, thereby improving the foaming efficiency of the generator body, accelerating the processing speed of the oil well, and thereby improving the efficiency of oil extraction.

[0024] 2) When the ultra-high pressure and large displacement nitrogen foam generator is in use, the rotation of the hollow tube also moves the fixed tube, the telescopic tube, the injection head, the fixed rod and the ball head. When the ball head is squeezed by the arc block, the fixed rod moves with the injection head and the telescopic tube toward the inside of the fixed tube, so that the injection head rotates and expands and contracts at the same time, and then the injection head discharges nitrogen at different positions in the mixed liquid, further improving the efficiency of the generator body in generating foam.

[0025] 3) When the ultra-high pressure and large displacement nitrogen foam generator is in use, when the foam mixture enters the ejection head, multiple arc rotating plates swirl the foam mixture and collide the foam mixture again. In addition, a number of collision blocks are fixedly installed on the surface of the arc rotating plates, so that the foam mixture collides frequently, thereby compensating for the foam lost during the transportation process and ensuring that the stock of bubbles meets the requirements of deep well operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the generator body of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the mixing box of the present invention; Figure 4 It is a schematic diagram of the position structure of the mixing box and the gas collecting plate of the present invention; Figure 5 It is a schematic diagram of the structure of the stirring device and the hollow tube position of the present invention; Figure 6 It is a schematic diagram of the structure of the mixing box and the arc block position of the present invention; Figure 7 It is a schematic diagram of the cross-section structure of the injection device of the present invention; Figure 8 It is a schematic diagram of the three-way pipe structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the position of the spray head and the three-way pipe of the present invention; Fig.10 It is a schematic diagram of the cross-sectional structure of the spray head of the present invention.

[0027] Explanation of the reference numerals in the figure: 1. Generator body; 2. Base; 3. Mixing box; 4. Rotating ring; 5. Hollow tube; 6. Stirring device; 7. Air baffle; 8. Injection device; 801. Fixed tube; 802. Telescopic tube; 803. Injection head; 804. Fixed rod; 805. Ball head; 806. Fixed ring; 807. Spring; 9. Arc block; 10. Nitrogen inlet pipe; 11. Foaming liquid inlet pipe; 12. First gas distribution pipe; 13. Second gas distribution pipe; 14. Gas collecting plate; 15. Oblique pipe; 16. Fixed seat; 17. Mixed foam outlet pipe; 18. Foam homogenizer; 19. Connecting pipe; 20. Inclined guide plate; 21. Slot 1; 22. Slot 2; 23. Slot 3; 24. Fixed block; 25. Spray head; 26. Tee pipe; 27. Pump truck connecting pipe; 28. Pipe sleeve connecting pipe; 29. ​​Spray head sealing groove; 30. Ring sleeve; 31. External thread; 32. Arc plate; 33. Impact block; 34. Air outlet cone head; 35. Internal thread. DETAILED DESCRIPTION

[0028] Example 1: Please refer to Figure 1 - Fig.10A super-high-pressure and large-displacement nitrogen foam generator comprises a generator body 1, which is a device for generating bubbles. A base 2 is fixedly installed on the inner bottom surface of the generator body 1, and a mixing box 3 is fixedly installed on the surface of the base 2, which is a storage tank that can withstand a high pressure of 120MPa in the prior art. The mixing box 3 is used to stir and mix the mixed liquid to generate nitrogen foam. A swivel 4 is fixedly installed on the inner bottom surface of the mixing box 3, and a hollow tube 5 sealed therewith is rotatably connected inside the swivel 4. A stirring device 6 is fixedly installed on the bottom surface of the hollow tube 5, and a plurality of air baffles 7 are arranged in a circular array on the middle surface of the hollow tube 5. The air baffle 7 is made of plastic to reduce its own gravity and is easier to The air baffle plate 7 is easy to rotate, and the air baffle plate 7 rotates with the hollow tube 5. At this time, the stirring device 6 follows the rotation of the hollow tube 5 to stir the foaming liquid and the nitrogen mixture. Compared with the traditional motor-driven stirring blade, it is more environmentally friendly and energy-saving. Two groups of retractable injection devices 8 are arranged between the stirring device 6 and the air baffle plate 7. When the ball head 805 moves and is squeezed by the arc block 9, the fixed rod 804 moves with the injection head 803 and the telescopic tube 802 toward the inside of the fixed tube 801, so that the injection head 803 rotates and retracts at the same time, so that the injection head 803 discharges nitrogen at different positions in the mixed liquid. The two groups of injection devices 8 are arranged in a circular array on the surface of the hollow tube 5. Any one of the injection devices 8 can discharge nitrogen at different positions in the mixed liquid. The injection device 8 is connected to the hollow tube 5. The inner wall of the mixing box 3 is fixedly installed with an arc block 9 corresponding to the position of the injection device 8. The arc block 9 is used to assist the expansion and contraction of the injection device 8. The foaming liquid enters the mixing box 3 through the foaming liquid inlet pipe 11, and the nitrogen enters the bottom of the mixing box 3 through the nitrogen inlet pipe 10. During the process of nitrogen passing through the nitrogen inlet pipe 10, the nitrogen is divided into two paths. The first path is that the nitrogen enters the gas collecting plate 14 through the second gas distribution pipe 13, and then blows through the three inclined pipes 15 through the gas collecting plate 14, and then acts on the surface of the air baffle 7. At this time, the air baffle 7 rotates and rotates with the hollow tube 5. At this time, the stirring device 6 follows the rotation of the hollow tube 5 to stir the foaming liquid and nitrogen mixed liquid. The second path is that nitrogen enters the hollow tube 5 through the first gas distribution pipe 12. At this time, the nitrogen in the hollow tube 5 is blown to the mixed liquid in the mixing box 3 through the fixed pipe 801, the telescopic pipe 802 and the injection head 803, so that the nitrogen is blown inside the mixed liquid. Compared with the traditional mixing device, the mixing device not only makes the mixed liquid generate foam quickly, but also increases the amount of foam generated by the generator body 1. In addition, the injection head 803 blows the mixed liquid in the mixing box 3, forming nitrogen foam bubbles that are small and not easy to break, thereby improving the foaming efficiency of the generator body 1, accelerating the processing speed of the oil well, and thus improving the efficiency of oil extraction; The injection device 8 includes a fixed tube 801, which is fixedly connected to the surface of the hollow tube 5, and the fixed tube 801 is communicated with the hollow tube 5. The fixed tube 801 is slidably connected to a telescopic tube 802 matched therewith. The surface of the telescopic tube 802 is fixedly installed with an injection head 803 communicated therewith. The fixed tube 801, the telescopic tube 802 and the injection head 803 are all pipelines that can withstand a high pressure of 120MPa in the prior art. The rotation of the hollow tube 5 also moves the fixed tube 801, the telescopic tube 802, the injection head 803, the fixed rod 804 and the ball head 805. When the ball head 805 is squeezed by the arc block 9, the fixed rod 804 moves with the injection head 803 and the telescopic tube 802 toward the inside of the fixed tube 801, so that the injection head 803 rotates and expands at the same time, so that the injection head 803 discharges nitrogen at different positions in the mixed liquid, further improving the efficiency of the generator body 1 in generating foam.

[0029] A fixing rod 804 is fixedly installed on the surface of the injection head 803, and a ball head 805 in contact with the arc block 9 is fixedly installed on the surface of one end of the fixing rod 804. A fixing ring 806 is fixedly connected to the inner wall of the fixing tube 801. A spring 807 is elastically connected between the fixing ring 806 and the telescopic tube 802. One end of the spring 807 is fixedly connected to the end surface of the telescopic tube 802, and the other end of the spring 807 is fixedly connected to the surface of the fixing ring 806. The spring 807 is used for movement and resetting of the telescopic tube 802.

[0030] The end surface of the mixing box 3 is fixedly installed with a nitrogen inlet pipe 10 and a foaming liquid inlet pipe 11 connected thereto. The first gas distribution pipe 12 and the foaming liquid inlet pipe 11 are both pipelines that can withstand a high pressure of 120MPa in the prior art. A fixing seat 16 is fixedly installed on the inner top surface of the mixing box 3. The bottom surface of the fixing seat 16 is rotatably connected to the hollow tube 5. The hollow tube 5 is sealed with the bottom surface of the fixing seat 16. The first gas distribution pipe 12 is fixedly installed inside the fixing seat 16. One end of the first gas distribution pipe 12 is connected to the hollow tube 5. The first gas distribution pipe 12 is fixedly installed inside the fixing seat 16. The other end of the tube 12 is connected to the nitrogen inlet pipe 10. The hollow tube 5 rotates between the swivel 4 and the fixed seat 16. The swivel 4 and the fixed seat 16 ensure the sealing of the hollow tube 5 to prevent the bubble liquid from entering the hollow tube 5. The injection head 803, the nitrogen inlet pipe 10 and the second air distribution pipe 13 enter the mixing box 3. According to the foaming liquid inlet pipe 11 entering the foaming agent in the mixing box 3, the nitrogen amount can be adjusted within a certain range. Within the nitrogen amount adjustment range, when the minimum nitrogen amount passes through the second air distribution pipe 13, it can also drive the air baffle 7 to rotate.

[0031] The surface of the mixing box 3 is fixedly installed with three oblique pipes 15 connected thereto. The oblique pipes 15 are pipelines in the prior art that can withstand a high pressure of 120 MPa. The oblique pipes 15 are arranged obliquely, and the ports of the oblique pipes 15 correspond to the positions of the air baffles 7. One end of the three oblique pipes 15 is fixedly installed with a gas collecting plate 14 connected thereto. The bottom surface of the gas collecting plate 14 is fixedly installed with a second gas distribution pipe 13 connected thereto. The amount of nitrogen entering the second gas distribution pipe 13 does not need to be controlled. It only needs the nitrogen inside the second gas distribution pipe 13 to enter the gas collecting plate 14 and the oblique pipe 15. The amount of nitrogen discharged from the oblique pipe 15 can drive The air baffle plate 7 can be rotated, one end of the second air distribution pipe 13 is connected to the nitrogen inlet pipe 10, one end of the nitrogen inlet pipe 10 extends to the interior of the mixing box 3, and the position of the port is close to the inner bottom surface of the mixing box 3, the port of the nitrogen inlet pipe 10 does not contact the inner bottom surface of the mixing box 3, and the nitrogen inlet pipe 10 is an extension pipe inside the mixing box 3, and the extension pipe is arranged close to the inner wall of the mixing box 3, which will not affect the movement of the stirring device 6, the air baffle plate 7, the fixing rod 804 and the ball head 805. The angle of the inclined tube 15 is set to better act on the surface of the air baffle plate 7 so that the air baffle plate 7 rotates under the action of wind.

[0032] The surface of the mixing box 3 is correspondingly provided with a groove 1 21 and a groove 2 22. The mixing box 3 is a conventional mixing device with an exhaust valve in the prior art. The nitrogen inlet pipe 10 is connected to the mixing box 3 through the groove 1 21, and the foaming liquid inlet pipe 11 is connected to the mixing box 3 through the groove 22. The top surface of the mixing box 3 is provided with a groove 3 23, and the first gas distribution pipe 12 is connected to the hollow tube 5 through the groove 3 23.

[0033] A foam homogenizer 18 is fixedly installed on one side of the mixing box 3, and a mixed foam outlet pipe 17 is arranged between the foam homogenizer 18 and the mixing box 3. One end of the mixed foam outlet pipe 17 is connected to the mixing box 3, and the other end of the mixed foam outlet pipe 17 is connected to the foam homogenizer 18. An inclined guide plate 20 is fixedly installed on the outer surface of the swivel 4. The foam homogenizer 18 is a conventional foam homogenizer 18 in the prior art. The foam homogenizer 18 homogenizes larger nitrogen foam into fine nitrogen foam, which is not easy to break.

[0034] A connecting pipe 19 connected to the foam homogenizer 18 is fixedly installed on the surface thereof, one end of the connecting pipe 19 extends to the outside of the generator body 1, the connecting pipe 19 is a pipeline that can withstand a high pressure of 120 MPa in the prior art, and a fixed block 24 is fixedly installed at the port of the connecting pipe 19, a spray head 25 is fixedly installed on the surface of the fixed block 24, and the nitrogen foam displacement of the spray head 25 is 25 cubic meters / minute. A tee pipe 26 is arranged on one side of the spray head 25, and the tee pipe 26 is a pipeline that can withstand a high pressure of 120 MPa in the prior art. A pump truck connecting pipe 27 connected to the tee pipe 26 is fixedly installed on the top surface thereof, and a pipe sleeve connecting pipe 28 connected to the tee pipe 26 is fixedly installed on the bottom surface thereof, and a nozzle sealing groove 29 connected to the spray head 25 is provided on the surface of the tee pipe 26. The nozzle sealing groove 29 is arranged to prevent nitrogen foam from overflowing.

[0035] An internal thread 35 is provided on the inner wall of the fixed block 24, and a ring sleeve 30 is fixedly installed on one end surface of the spray head 25. The outer surface of the ring sleeve 30 is provided with an external thread 31 matching the internal thread 35. The spray head 25 is fixedly connected to the fixed block 24 through the matching of the external thread 31 and the internal thread 35, so that the spray head 25 is installed on the surface of the fixed block 24 more firmly.

[0036] An outlet cone 34 sealed with the nozzle sealing groove 29 is fixedly mounted on the other end surface of the nozzle 25 . The nozzle 25 is connected to the three-way pipe 26 through the matching of the outlet cone 34 and the nozzle sealing groove 29 .

[0037] The use steps of the present invention are as follows: when the ultra-high pressure and large displacement nitrogen foam generator is used, the generator body 1 is first placed on the ground beside the wellhead, and then the pump truck connecting pipe 27 is connected to the pump truck through a high-pressure pipe, the bottom surface of the pipe sleeve connecting pipe 28 is connected to the pipe sleeve in the wellhead, the nitrogen inlet pipe 10 is connected to the nitrogen generating device through a high-pressure pipe, and the foaming liquid inlet pipe 11 is connected to the foaming liquid storage box through a high-pressure pipe (the connection between the nitrogen inlet pipe 10 and the mixing box 3 and the connection between the foaming liquid inlet pipe 11 and the mixing box 3 are both equipped with existing flow control valves to control the nitrogen intake and the amount of foaming agent added, so that the foaming agent is foamed in the mixing box 3. In the nitrogen foam generator, the nitrogen intake increases within a certain range and does not exceed the limit range value, ensuring that the nitrogen second gas distribution pipe 13 is discharged through the inclined tube 15 with the air baffle 7 rotating, and the nitrogen intake amount is controlled to be increased within the required nitrogen amount range). When the generator body 1 is working to generate bubbles, the foaming liquid enters the mixing box 3 through the foaming liquid inlet pipe 11, and the nitrogen enters the bottom of the mixing box 3 through the nitrogen inlet pipe 10 (the foaming liquid is injected from top to bottom, and the nitrogen is injected from bottom to top). During the process of nitrogen passing through the nitrogen inlet pipe 10, the nitrogen is divided into two paths. The first path is that the nitrogen enters the air collecting plate 14 through the second air distribution pipe 13, and then blows through the three inclined tubes 15 through the air collecting plate 14, and then acts on the surface of the air baffle 7. At this time, the air baffle 7 rotates and rotates with the hollow tube 5. At this time, the stirring device 6 follows the rotation of the hollow tube 5 to mix and stir the foaming liquid and nitrogen (injection The second way is that the nitrogen enters the hollow tube 5 through the first gas distribution pipe 12. At this time, the nitrogen in the hollow tube 5 is blown to the mixed liquid in the mixing box 3 through the fixed tube 801, the telescopic tube 802 and the injection head 803, so that the nitrogen is blown inside the mixed liquid to increase the amount of foam produced by the generator body 1 and quickly generate foam. The rotation of the hollow tube 5 also moves with the fixed tube 801, the telescopic tube 802, the injection head 803, the fixed rod 804 and the ball head 805. When the ball head 805 is squeezed by the arc block 9, the fixed rod 804 moves with the injection head 803 and the telescopic tube 802 toward the inside of the fixed tube 801. Movement makes the injection head 803 rotate and extend at the same time, so that the injection head 803 discharges nitrogen at different positions in the mixed liquid. After the foam is generated, the switch valve between the mixed foam outlet pipe 17 and the mixing box 3 is turned on and off. At this time, the pump truck works to make the high-speed airflow enter the pipe sleeve through the three-way pipe 26 and the pipe sleeve connecting pipe 28. At this time, the foam mixed liquid inside the mixing box 3 passes through the mixed foam outlet pipe 17, the foam homogenizer 18 and the connecting pipe 19, and the foam mixed liquid is sprayed from the injection head 25 into the three-way pipe 26. The foam mixed liquid enters the deep well under the action of the pump truck. In this scheme, the foaming liquid enters the mixing box 3 through the foaming liquid inlet pipe 11, and the nitrogen enters the bottom of the mixing box 3 through the nitrogen inlet pipe 10. During the process of nitrogen passing through the nitrogen inlet pipe 10, the nitrogen is divided into two paths.The first route is that nitrogen enters the gas collecting plate 14 through the second gas distribution pipe 13, and then is blown through the three inclined tubes 15 through the gas collecting plate 14, and then acts on the surface of the gas baffle 7. At this time, the rotation of the gas baffle 7 brings the hollow tube 5 to rotate. At this time, the stirring device 6 follows the rotation of the hollow tube 5 to stir the foaming liquid and the nitrogen mixture. The second route is that nitrogen enters the hollow tube 5 through the first gas distribution pipe 12. At this time, the nitrogen inside the hollow tube 5 is blown to the mixed liquid inside the mixing box 3 through the fixed tube 801, the telescopic tube 802 and the injection head 803, so that the nitrogen is blown inside the mixed liquid. Compared with the traditional mixing device, the mixing device not only enables the mixed liquid to generate foam quickly, but also increases the amount of foam generated by the generator body 1. The upper injection head 803 blows air into the mixed liquid inside the mixing box 3, forming nitrogen foam bubbles that are small and not easy to break, thereby improving the foaming efficiency of the generator body 1, accelerating the processing speed of the oil well, and thus improving the efficiency of oil extraction; the rotation of the hollow tube 5 also moves the fixed tube 801, the telescopic tube 802, the injection head 803, the fixed rod 804 and the ball head 805. When the ball head 805 is squeezed by the arc block 9, the fixed rod 804 moves with the injection head 803 and the telescopic tube 802 toward the inside of the fixed tube 801, so that the injection head 803 rotates and telescopes at the same time, and then the injection head 803 discharges nitrogen at different positions in the mixed liquid, further improving the efficiency of the generator body 1 in generating foam.

[0038] Example 2: Please refer to Figure 1 - Fig.10 , combined with the basis of Example 1, the difference is that a plurality of arc-spinning plates 32 are fixedly installed on the inner wall of the ejection head 25, and the plurality of arc-spinning plates 32 are staggered in height. The arc-spinning plates 32 are spiral arc-shaped plates, and a plurality of collision blocks 33 are fixedly installed on the surface of any arc-spinning plate 32. By fixing a plurality of arc-spinning plates 32 on the inner wall of the ejection head 25, when the foam mixture enters the ejection head 25, the plurality of arc-spinning plates 32 swirl the foam mixture, and collide the foam mixture again, and a plurality of collision blocks 33 are fixedly installed on the surface of the arc-spinning plates 32, so that the foam mixture frequently collides, thereby realizing compensation for the foam lost during the transportation process, and ensuring that the stock of bubbles meets the requirements of deep well operations.

[0039] The use steps of the present invention are as follows: when the ultra-high pressure and large displacement nitrogen foam generator is in use, in order to reduce the loss of nitrogen foam during transportation, a plurality of arc rotating plates 32 are fixedly installed on the inner wall of the ejection head 25. When the foam mixture enters the ejection head 25, the plurality of arc rotating plates 32 swirl the foam mixture and collide the foam mixture again. In addition, a plurality of collision blocks 33 are fixedly installed on the surface of the arc rotating plates 32, so that the foam mixture collides frequently, thereby compensating for the foam lost during transportation and ensuring that the stock of bubbles meets the requirements of deep well operations.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An ultra-high pressure and large displacement nitrogen foam generator, comprising a generator body (1), characterized in that: A base (2) is fixedly mounted on the inner bottom surface of the generator body (1), a mixing box (3) is fixedly mounted on the surface of the base (2), a swivel (4) is fixedly mounted on the inner bottom surface of the mixing box (3), a hollow tube (5) sealed therewith is rotatably connected to the inside of the swivel (4), a stirring device (6) is fixedly mounted on the bottom surface of the hollow tube (5), a plurality of air baffles (7) are arranged in a circular array on the middle surface of the hollow tube (5), two groups of retractable injection devices (8) are arranged between the stirring device (6) and the air baffles (7), the two groups of injection devices (8) are arranged in a circular array on the surface of the hollow tube (5), any one of the injection devices (8) is connected to the hollow tube (5), an arc block (9) corresponding to the position of the injection device (8) is fixedly mounted on the inner wall of the mixing box (3), and the arc block (9) is used to assist the extension and retraction of the injection device (8); The spraying device (8) comprises a fixed tube (801), the fixed tube (801) being fixedly connected to the surface of the hollow tube (5), and the fixed tube (801) being in communication with the hollow tube (5), the interior of the fixed tube (801) being slidably connected to a telescopic tube (802) matching the fixed tube (801), and a spray head (803) in communication with the telescopic tube (802) being fixedly mounted on the surface of the telescopic tube (802).

2. The ultra-high pressure and large displacement nitrogen foam generator according to claim 1, characterized in that: A fixing rod (804) is fixedly mounted on the surface of the injection head (803); a ball head (805) in contact with the arc block (9) is fixedly mounted on the surface of one end of the fixing rod (804); a fixing ring (806) is fixedly connected to the inner wall of the fixing tube (801); a spring (807) is elastically connected between the fixing ring (806) and the telescopic tube (802); one end of the spring (807) is fixedly connected to the end surface of the telescopic tube (802); and the other end of the spring (807) is fixedly connected to the surface of the fixing ring (806).

3. The ultra-high pressure and large displacement nitrogen foam generator according to claim 1, characterized in that: A nitrogen inlet pipe (10) and a foaming liquid inlet pipe (11) in communication with the mixing box (3) are fixedly mounted on the end surface of the mixing box (3), and a fixing seat (16) is fixedly mounted on the inner top surface of the mixing box (3). The bottom surface of the fixing seat (16) is rotatably connected to the hollow tube (5). The hollow tube (5) is sealed with the bottom surface of the fixing seat (16). A first gas distribution pipe (12) is fixedly mounted inside the fixing seat (16). One end of the first gas distribution pipe (12) is in communication with the hollow tube (5), and the other end of the first gas distribution pipe (12) is in communication with the nitrogen inlet pipe (10).

4. The ultra-high pressure and large displacement nitrogen foam generator according to claim 1, characterized in that: The surface of the mixing box (3) is fixedly provided with three oblique tubes (15) in communication with the mixing box (3). The oblique tubes (15) are arranged at an angle, and the ports of the oblique tubes (15) correspond to the positions of the air baffles (7). An air collecting plate (14) in communication with the mixing box (3) is fixedly provided at one end of the three oblique tubes (15). A second air distribution pipe (13) in communication with the mixing box (14) is fixedly provided on the bottom surface of the air collecting plate (14). One end of the second air distribution pipe (13) in communication with the nitrogen inlet pipe (10) is extended to the interior of the mixing box (3), and the port is located close to the inner bottom surface of the mixing box (3).

5. The ultra-high pressure and large displacement nitrogen foam generator according to claim 3, characterized in that: The surface of the mixing box (3) is provided with a first groove (21) and a second groove (22) respectively; the nitrogen inlet pipe (10) is connected to the mixing box (3) through the first groove (21); the foaming liquid inlet pipe (11) is connected to the mixing box (3) through the second groove (22); a third groove (23) is provided on the top surface of the mixing box (3); and the first gas distribution pipe (12) is connected to the hollow pipe (5) through the third groove (23).

6. The ultra-high pressure and large displacement nitrogen foam generator according to claim 1, characterized in that: A foam homogenizer (18) is fixedly mounted on one side of the mixing box (3); a mixed foam outlet pipe (17) is provided between the foam homogenizer (18) and the mixing box (3); one end of the mixed foam outlet pipe (17) is connected to the mixing box (3); and the other end of the mixed foam outlet pipe (17) is connected to the foam homogenizer (18); and an inclined guide plate (20) is fixedly mounted on the outer surface of the rotating ring (4).

7. The ultra-high pressure and large displacement nitrogen foam generator according to claim 6, characterized in that: A connecting pipe (19) in communication with the foam homogenizer (18) is fixedly mounted on the surface thereof, one end of the connecting pipe (19) extends to the outside of the generator body (1), and a fixing block (24) is fixedly mounted at the end of the connecting pipe (19), a spray head (25) is fixedly mounted on the surface of the fixing block (24), a tee pipe (26) is provided on one side of the spray head (25), a pump truck connecting pipe (27) in communication with the tee pipe (26) is fixedly mounted on the top surface of the tee pipe (26), a pipe sleeve connecting pipe (28) in communication with the tee pipe (26) is fixedly mounted on the bottom surface of the tee pipe (26), and a spray head sealing groove (29) in communication with the spray head (25) is provided on the surface of the tee pipe (26).

8. The ultra-high pressure and large displacement nitrogen foam generator according to claim 7, characterized in that: The inner wall of the fixing block (24) is provided with an internal thread (35); a ring sleeve (30) is fixedly mounted on one end surface of the spray head (25); an outer surface of the ring sleeve (30) is provided with an external thread (31) matching the internal thread (35); the spray head (25) is fixedly connected to the fixing block (24) by the external thread (31) and the internal thread (35) matching each other.

9. The ultra-high pressure and large displacement nitrogen foam generator according to claim 7, characterized in that: The other end surface of the spray head (25) is fixedly mounted with a gas outlet cone head (34) sealed with the spray head sealing groove (29), and the spray head (25) is connected to the three-way pipe (26) through the matching of the gas outlet cone head (34) and the spray head sealing groove (29).

10. The ultra-high pressure and large displacement nitrogen foam generator according to claim 7, characterized in that: A plurality of arc-spinning plates (32) are fixedly mounted on the inner wall of the ejection head (25). The plurality of arc-spinning plates (32) are arranged in a staggered manner at different heights. The arc-spinning plates (32) are spiral arc-shaped plates. A plurality of collision blocks (33) are fixedly mounted on the surface of any of the arc-spinning plates (32).

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