Nitrogen foam generator for gas well fracturing

Abstract

The invention discloses a nitrogen foam generator for gas well fracturing, and relates to the technical field of gas well fracturing, the nitrogen foam generator comprises an external assembly, a communicating assembly, a well entering assembly, a supporting assembly, a knocking assembly and a driving assembly, and the external assembly comprises a foam homogenizer. According to the device, the knocking plate repeatedly knocks the inner wall of the gas well while nitrogen foam is sprayed out of the spray head, the inner wall of the gas well is rapidly cracked through direct impact force generated by knocking, pressure generated by the nitrogen foam can act on the crack position, and the excellent flowing property of the nitrogen foam is fully utilized; by means of the gas well fracturing device, the nitrogen foam acts in the cracks within a short time, gas well fracturing operation is rapidly completed, consumption in the stage that the nitrogen foam impacts the inner wall of the gas well to generate the cracks is reduced, the gas well fracturing operation can be completed under the condition that few materials are used, the construction cost of gas well fracturing operation is effectively reduced, and the fracturing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas well fracturing, in particular to a nitrogen foam generator for gas well fracturing. Background Art

[0002] Nitrogen foam generator is a device used to produce nitrogen foam during gas well fracturing. Gas well fracturing is the process of applying sufficiently high pressure to the gas well formation to break the formation rock and form cracks. These cracks can greatly increase the permeability of the formation and improve the flow channel of gas in the formation.

[0003] In the prior art, when a nitrogen foam generator is used to perform fracturing operations on a gas well, the nozzle of the foam generator is sent into the well, and the impact force generated by high pressure is used to spray nitrogen foam onto the inner wall of the gas well for fracturing. When the nitrogen foam acts on the surface of the rock formation in the gas well, the nitrogen foam in a fluid state directly acts on the flat surface of the rock formation. According to the principles of fluid mechanics, when the fluid encounters an obstacle, a bypass phenomenon will occur, which will cause the fluid to disperse and the impact force to be damaged. Therefore, the impact of the nitrogen foam takes a long time to crack the rock formation in the well, affecting the efficiency of the gas well fracturing operation and the control of the construction cost.

[0004] Therefore, a nitrogen foam generator for gas well fracturing is proposed to solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to provide a nitrogen foam generator for gas well fracturing to solve the problem that the impact of nitrogen foam mentioned in the above background technology takes a long time to crack the rock formation in the well, affecting the efficiency of gas well fracturing operations and the control of construction costs.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a nitrogen foam generator for gas well fracturing, comprising an external component, a connecting component, a well entry component, a supporting component, a knocking component and a driving component, wherein the external component comprises a foam homogenizer; the connecting component is fixedly connected to the lower end surface of the foam homogenizer, the connecting component comprises a first connector, the end surface of the first connector is fixedly connected to a high-pressure hose, and the end surface of the high-pressure hose is fixedly connected to a second connector; the well entry component comprises an outer shell, the inner bottom of the outer shell is fixedly connected to a fixed pipe, the upper end surface of the fixed pipe penetrates the outer shell and extends to the upper side, and the end surface of the fixed pipe is fixedly connected to the end surface of the second connector; the number of the supporting components is set to be multiple, and the multiple supporting components are evenly fixedly connected to the upper and lower inner surfaces of the outer shell, and the supporting component comprises a first spring; the knocking component is fixedly connected to the outer surface of the fixed pipe, and the knocking component comprises a fixed sleeve; the driving component is fixedly connected to the outer shell, and the driving component comprises a bearing and a waterproof motor.

[0007] Preferably, the upper end surface of the foam homogenizer is evenly and fixedly connected with a plurality of confluence pipes, the confluence pipes are distributed in a circle and are in a connected state with the foam homogenizer, wherein the upper end surfaces of several confluence pipes are fixedly connected with a first staggered pipe, and the upper end surfaces of another several confluence pipes are fixedly connected with a second staggered pipe, and the first staggered pipes and the second staggered pipes are in a staggered state.

[0008] By adopting the above technical solution, the first staggered tube and the second staggered tube are used in conjunction with each other to connect the fracturing fluid and the nitrogen respectively. The first staggered tube and the second staggered tube are distributed in an annular shape and are in a staggered position, which will make the fracturing fluid and the nitrogen entering the foam homogenizer staggered and converge, and the fracturing fluid and the nitrogen can be evenly contacted and mixed, thereby improving the uniformity of the nitrogen foam produced by the foam homogenizer. The nitrogen foam with a finer and more uniform texture generates a more uniform pressure on the gas well formation, thereby improving the fracturing effect on the gas well.

[0009] Preferably, a liquid inlet pipe is fixedly connected between the upper end surfaces of the plurality of first staggered tubes, an outer sleeve is fixedly connected between the upper end surfaces of the plurality of second staggered tubes, and an air inlet pipe is fixedly connected to the outer surface of the outer sleeve.

[0010] By adopting the above technical solution, fracturing fluid is transported into the foam homogenizer through the connection of the liquid inlet pipe, and nitrogen is transported into the foam homogenizer through the connection of the air inlet pipe.

[0011] Preferably, a protective tube is fixedly connected between the first connector and the second connector, the protective tube is located outside the high-pressure hose, a side tube is fixedly connected to the outer surface of the protective tube, a power cord is arranged inside the side tube, the power cord extends to a position between the high-pressure hose and the protective tube, and the other end of the power cord passes through the protective tube and extends to the outside.

[0012] By adopting the above technical solution, the use of a protective tube can provide protection for the high-pressure hose, thereby preventing the high-pressure hose through which the high-pressure medium flows from being damaged by long-term friction. At the same time, the gap formed between the protective tube and the high-pressure hose can provide a channel for the power cord, so that the power cord can be used to supply electrical energy to the outer shell position entering the well, effectively improving the functionality of the foam generator.

[0013] Preferably, a connecting ring is symmetrically fixedly connected to the outer surface of the fixed tube, a plurality of inner tubes are evenly fixedly connected to the outer surface of the connecting ring, the end faces of the inner tubes are fixedly connected to the inner surface of the outer shell, two groups of nozzles are evenly fixedly connected to the outer surface of the outer shell, the number of the nozzles is consistent with the number of the inner tubes, and the plurality of nozzles are respectively connected to the plurality of inner tubes.

[0014] By adopting the above technical solution, nitrogen foam will be sprayed out from the nozzle position through the connection between the connecting ring and the inner pipe, and the nitrogen foam sprayed from the nozzle position acts on the inner wall of the gas well to perform fracturing operations.

[0015] Preferably, the first spring end face is fixedly connected with a connecting plate, and the outer surface of the connecting plate close to the first spring is symmetrically fixedly connected with a sliding rod, the sliding rod slides through the outer shell and extends to the outside, and a connecting seat is fixedly connected between the two sliding rod end faces, and a roller is rotatably connected to the inner surface of the connecting seat, and the roller is located outside the nozzle.

[0016] By adopting the above technical solution, when the outer shell is sent in, the rotation of the roller can reduce the friction force, and at the same time it can avoid the parts on the outer side of the outer shell from directly contacting and wearing the inner wall of the gas well, thereby improving the service life of the foam generator.

[0017] Preferably, a plurality of groups of second springs are fixedly connected to the outer surface of the fixed sleeve, side plates are fixedly connected between the end surfaces of the plurality of groups of second springs, an insertion rod is fixedly connected to the outer surface of the side plate, and the insertion rod slides through the outer shell and extends to the outside.

[0018] By adopting the above technical solution, the second spring is a high-strength spring. When the second spring is released, the second spring can enable the knocking plate and the cone head to exert a greater impact force on the inner wall of the gas well, thereby achieving the purpose of assisting fracturing.

[0019] Preferably, a knocking plate is fixedly connected to the end face of the insertion rod, the knocking plate has an arc-shaped cross-section, a plurality of cone heads are evenly fixedly connected to the outer surface of the knocking plate, a plurality of notches are equidistantly provided on the outer surface of the knocking plate, and a lever is fixedly connected to the top of the side plate.

[0020] By adopting the above technical solution, the cone head is made of diamond material with relatively high hardness. By utilizing the impact force of the knocking plate on the inner wall of the gas well, the cone head can impact and crush the inner wall of the gas well. The physical contact impact force generated by the cone head can cause the inner wall of the gas well to be knocked and broken.

[0021] Preferably, the bearing is fixedly connected to the inner surface of the outer shell, a rotating ring is fixedly connected to the inner surface of the bearing, a gear ring is fixedly connected to the top of the rotating ring, a plurality of inclined blocks, tooth plates and rubber pads are evenly fixedly connected to the inner surface of the rotating ring, the inclined blocks, tooth plates and rubber pads are distributed in a ring shape, the waterproof motor is fixedly connected to the top of the outer shell, the upper end face of the waterproof motor is fixedly connected to the lower end face of the side tube, and the waterproof motor is electrically connected to the power cord.

[0022] By adopting the above technical scheme, through the setting of the inclined block, the lever can be pushed toward the fixed sleeve, and when the side plate moves toward the fixed sleeve, the second spring will be compressed to shrink. By utilizing the rebound force of the second spring, the side plate, the plug rod, the knocking plate and the lever can be driven to rebound and reset outward. The knocking plate uses the rebound force to generate a large impact force on the inner wall of the gas well, so that the knocking plate and the cone head cooperate to knock on the inner wall of the gas well. The rubber pad is provided to provide soft support to prevent the lever from being damaged by collision. Through the setting of the tooth plate, the second spring will repeatedly maintain a small amplitude for compression and rebound, and the knocking plate can maintain a faster frequency to knock on the inner wall of the gas well with a small amplitude, which has a better knocking and crushing effect on the inner wall of the gas well.

[0023] Preferably, the output end of the waterproof motor passes through the outer shell and extends to the inner side, the output end of the waterproof motor is fixedly connected with a rotating shaft, the lower end surface of the rotating shaft is fixedly connected with a gear, and the gear is meshingly connected with a gear ring.

[0024] By adopting the above technical solution, the gear can be driven by the waterproof motor to follow the rotation, and the gear ring and the rotating ring can be driven to follow the rotation through the rotation of the gear.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, when the nitrogen foam generator is used for gas well fracturing operation, the waterproof motor drives the nozzle to spray nitrogen foam while the knocking plate repeatedly knocks on the inner wall of the gas well. The direct impact force generated by the knocking causes cracks to form quickly on the inner wall of the gas well. The pressure generated by the nitrogen foam can act from the crack position, making full use of the excellent flow properties of the nitrogen foam so that the nitrogen foam acts on the cracks in a shorter time, quickly completing the gas well fracturing operation, reducing the consumption of nitrogen foam in the stage of impacting the inner wall of the gas well to generate cracks, and completing the gas well fracturing operation while using less materials, thereby achieving the purpose of low carbon, energy saving and environmental protection, effectively reducing the construction cost of the gas well fracturing operation, and improving the fracturing efficiency.

[0026] 2. In the present invention, the first staggered tube and the second staggered tube are used in conjunction to respectively connect the fracturing fluid and the nitrogen. The first staggered tube and the second staggered tube are distributed in a ring shape and are in a staggered position, which will make the fracturing fluid and the nitrogen entering the foam homogenizer staggered and converge, and the fracturing fluid and the nitrogen can be evenly contacted and mixed, thereby improving the uniformity of the nitrogen foam produced by the foam homogenizer. The nitrogen foam with a finer and more uniform texture generates a more uniform pressure on the gas well formation, thereby improving the fracturing effect on the gas well.

[0027] 3. In the present invention, the outer shell can be supported by the setting of the support assembly, and the resilience of the first spring can be used to provide support for the connecting plate, the sliding rod, the connecting seat and the roller, so that the roller and the inner wall of the gas well are always kept in contact with each other. When the outer shell is sent in, the rotation of the roller can reduce the friction force, and at the same time, it can avoid the parts on the outer side of the outer shell from directly contacting with the inner wall of the gas well to cause wear, thereby improving the service life of the foam generator.

[0028] 4. In the present invention, the protective tube comes into contact with the gas well during the gas well fracturing operation, so the use of the protective tube can provide protection for the high-pressure hose, thereby preventing the high-pressure hose through which the high-pressure medium flows from being damaged by long-term friction. At the same time, the gap formed between the protective tube and the high-pressure hose can provide a channel for the power cord, so that the power cord can be used to supply electrical energy to the outer shell position entering the well, effectively improving the functionality of the foam generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional diagram of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 2 This is a schematic diagram of the external component structure of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 3 This is a schematic diagram of the structure of an inlet pipe of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 4 This is a schematic diagram of the structure of the connected components of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 5 This is a schematic diagram of the structure of a high-pressure hose of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 6 This is a schematic diagram of the shell structure of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 7 This is a cross-sectional view of the shell structure of a nitrogen foam generator for gas well fracturing according to the present invention; Figure 8 This is a schematic diagram of the structure of a well entry component of a nitrogen foam generator for gas well fracturing according to the present invention; Fig. 9 This is a schematic diagram of the structure of a support assembly of a nitrogen foam generator for gas well fracturing according to the present invention; Fig.10 This is a schematic diagram of the structure of a knocking assembly of a nitrogen foam generator for gas well fracturing according to the present invention; Fig.11 This is a schematic diagram of the structure of a driving component of a nitrogen foam generator for gas well fracturing according to the present invention; Fig.12 The present invention is a schematic diagram of the rotating ring structure of a nitrogen foam generator for gas well fracturing.

[0030] In the figure: 1. External component; 101. Foam homogenizer; 102. Inlet pipe; 103. First staggered pipe; 104. Liquid inlet pipe; 105. Second staggered pipe; 106. Outer sleeve; 107. Air inlet pipe; 2. Connecting component; 201. First connector; 202. High-pressure hose; 203. Second connector; 204. Protective pipe; 205. Side pipe; 206. Power cord; 3. Well entry component; 301. Outer shell; 302. Fixed pipe; 303. Connecting ring; 304. Internal pipe; 305. Sprinkler; 4. Support group Parts; 401, first spring; 402, connecting plate; 403, sliding rod; 404, connecting seat; 405, roller; 5, knocking assembly; 501, fixing sleeve; 502, second spring; 503, side plate; 504, plug rod; 505, knocking plate; 506, cone head; 507, notch; 508, lever; 6, driving assembly; 601, bearing; 602, rotating ring; 603, gear ring; 604, inclined block; 605, gear plate; 606, rubber pad; 607, waterproof motor; 608, rotating shaft; 609, gear. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figure 1-Figure 12As shown, the present invention provides a technical solution: a nitrogen foam generator for gas well fracturing, comprising an external component 1, a connecting component 2, a well entry component 3, a supporting component 4, a knocking component 5 and a driving component 6, wherein the external component 1 comprises a foam homogenizer 101; the connecting component 2 is fixedly connected to the lower end surface of the foam homogenizer 101, the connecting component 2 comprises a first connector 201, the end surface of the first connector 201 is fixedly connected to a high-pressure hose 202, and the end surface of the high-pressure hose 202 is fixedly connected to a second connector 203; the well entry component 3 comprises a shell 301, the inner bottom of the shell 301 is fixedly connected to a fixed pipe 302, the upper end surface of the fixed pipe 302 penetrates the shell 301 and extends to the upper side, and the end surface of the fixed pipe 302 is fixedly connected to the end surface of the second connector 203; the number of the supporting components 4 is set to be multiple, and the multiple supporting components 4 are evenly fixedly connected to the inner surfaces of the upper and lower sides of the shell 301, and the supporting component 4 comprises a first spring 401; the knocking component 5 is fixedly connected to the outer surface of the fixed pipe 302, and the knocking component 5 comprises a fixed sleeve 501;The driving assembly 6 is fixedly connected to the housing 301, and the driving assembly 6 includes a bearing 601 and a waterproof motor 607. A plurality of inlet pipes 102 are evenly and fixedly connected to the upper end surface of the foam homogenizer 101. The inlet pipes 102 are distributed in a circle and are in a connected state with the foam homogenizer 101. The upper end surfaces of several inlet pipes 102 are fixedly connected to the first staggered pipes 103, and the upper end surfaces of several other inlet pipes 102 are fixedly connected to the second staggered pipes 105. The first staggered pipes 103 and the second staggered pipes 105 are staggered. A liquid inlet pipe 104 is fixedly connected between the upper end surfaces of the plurality of first staggered pipes 103, and an outer sleeve 106 is fixedly connected between the upper end surfaces of the plurality of second staggered pipes 105. The outer surface of the outer sleeve 106 is fixedly connected to the air inlet pipe 107, a protective tube 204 is fixedly connected between the first connector 201 and the second connector 203, the protective tube 204 is located outside the high-pressure hose 202, a side tube 205 is fixedly connected to the outer surface of the protective tube 204, a power line 206 is arranged inside the side tube 205, the power line 206 extends to the position between the high-pressure hose 202 and the protective tube 204, and the other end of the power line 206 penetrates the protective tube 204 and extends to the outside, a connecting ring 303 is symmetrically fixedly connected to the outer surface of the fixed tube 302, a plurality of inner tubes 304 are evenly fixedly connected to the outer surface of the connecting ring 303, the end surface of the inner tube 304 is fixedly connected to the inner surface of the shell 301, and two groups of nozzles 305 are evenly fixedly connected to the outer surface of the shell 301, and the nozzles 305 The number of the plurality of nozzles 305 is consistent with that of the internal pipes 304, and the plurality of nozzles 305 are respectively connected to the plurality of internal pipes 304, the outer surface of the fixed sleeve 501 is fixedly connected to a plurality of groups of second springs 502, the end faces of the plurality of groups of second springs 502 are fixedly connected to a side plate 503, the outer surface of the side plate 503 is fixedly connected to a plug rod 504, the plug rod 504 slides through the outer shell 301 and extends to the outside, the end face of the plug rod 504 is fixedly connected to a knocking plate 505, the cross-section of the knocking plate 505 is arc-shaped, a plurality of cone heads 506 are evenly fixedly connected to the outer surface of the knocking plate 505, a plurality of notches 507 are equidistantly provided on the outer surface of the knocking plate 505, a lever 508 is fixedly connected to the top of the side plate 503, a bearing 601 is fixedly connected to the inner surface of the outer shell 301, The inner surface of the bearing 601 is fixedly connected with a rotating ring 602, the top of the rotating ring 602 is fixedly connected with a gear ring 603, the inner surface of the rotating ring 602 is evenly fixedly connected with a plurality of inclined blocks 604, tooth plates 605 and rubber pads 606, the inclined blocks 604, tooth plates 605 and rubber pads 606 are distributed in a ring shape, the waterproof motor 607 is fixedly connected to the top of the housing 301, the upper end surface of the waterproof motor 607 is fixedly connected to the lower end surface of the side tube 205, the waterproof motor 607 is electrically connected to the power line 206, the output end of the waterproof motor 607 penetrates the housing 301 and extends to the inside, the output end of the waterproof motor 607 is fixedly connected with a rotating shaft 608, the lower end surface of the rotating shaft 608 is fixedly connected with a gear 609, and the gear 609 is meshed and connected with the gear ring 603. ;

[0033] The use steps of the present invention are as follows: when the nitrogen foam generator is used for gas well fracturing, the fracturing fluid is transported into the foam homogenizer 101 through the connection of the liquid inlet pipe 104, and the nitrogen is transported into the foam homogenizer 101 through the connection of the air inlet pipe 107. After the fracturing fluid and the nitrogen enter the foam homogenizer 101, the high-pressure nitrogen foam generated after mixing will be ejected from the lower end outlet of the foam homogenizer 101. The use of the protective tube 204 can provide a protection effect for the high-pressure hose 202. At the same time, the gap formed between the protective tube 204 and the high-pressure hose 202 can provide a channel for the power line 206, so that the power line 206 can be used to enter the well. The housing 301 is provided with electric energy, and the nitrogen foam sprayed from the nozzle 305 acts on the inner wall of the gas well to perform fracturing operation. While the nitrogen foam is sprayed from the nozzle 305 to perform fracturing, the waterproof motor 607 is started to drive the gear 609 to rotate. When the gear 609 rotates, it can drive the rotating ring 602 to rotate by meshing with the gear ring 603. The rotation of the rotating ring 602 can drive multiple groups of inclined blocks 604, tooth plates 605 and rubber pads 606 to rotate. After the inclined surface of the inclined block 604 contacts the lever 508, it can push the lever 508 toward the fixed sleeve 501, and compress the second spring 502 to contract. As the waterproof motor 607 continues to operate, the lever 508 will be separated from the bevel of the bevel block 604. At this time, the lever 508 will quickly rebound to the position of fitting the rubber pad 606 by utilizing the rebound force of the second spring 502. The rubber pad 606 is set to provide soft support. The knocking plate 505 uses the rebound force to generate a large impact force on the inner wall of the gas well. At this time, the knocking plate 505 drives the cone head 506 to knock on the inner wall of the gas well. The cone head 506 is made of diamond material with relatively high hardness. The cone head 506 can impact and crush the inner wall of the gas well. The physical contact impact force generated by the cone head 506 can cause the inner wall of the gas well to be knocked and broken, and the nozzle 305 is sprayed at the position. The nitrogen foam produced can quickly generate cracks in the inner wall of the gas well. After the cracks are generated, the nitrogen foam sprayed from the nozzle 305 position can quickly penetrate into the cracks and diffuse the cracks. That is, with the coordinated use of the knocking plate 505, the cone head 506 and the nozzle 305, while the nitrogen foam is sprayed from the nozzle 305 position, the knocking plate 505 repeatedly knocks on the inner wall of the gas well, and the direct impact force generated by the knocking causes the inner wall of the gas well to quickly generate cracks. The pressure generated by the nitrogen foam can act from the crack position, making full use of the excellent flow properties of the nitrogen foam, so that the nitrogen foam acts on the cracks in a shorter time, and the gas well fracturing operation is quickly completed.

[0034] Embodiment 2: Figure 1-Figure 3As shown, a plurality of confluence pipes 102 are evenly and fixedly connected to the upper end surface of the foam homogenizer 101. The confluence pipes 102 are distributed in a circle and are in a connected state with the foam homogenizer 101, wherein the upper end surfaces of several confluence pipes 102 are fixedly connected to the first staggered pipes 103, and the upper end surfaces of another plurality of confluence pipes 102 are fixedly connected to the second staggered pipes 105. The first staggered pipes 103 and the second staggered pipes 105 are staggered, liquid inlet pipes 104 are fixedly connected between the upper end surfaces of the plurality of first staggered pipes 103, outer sleeves 106 are fixedly connected between the upper end surfaces of the plurality of second staggered pipes 105, and an air inlet pipe 107 is fixedly connected to the outer surface of the outer sleeve 106.

[0035] The use steps of the present invention are as follows: the first staggered tube 103 and the second staggered tube 105 are used in conjunction with each other to connect the fracturing fluid and the nitrogen respectively. The first staggered tube 103 and the second staggered tube 105 are distributed in an annular shape and are in a staggered position, which will make the fracturing fluid and the nitrogen entering the foam homogenizer 101 staggered and converge, and the fracturing fluid and the nitrogen can be evenly contacted and mixed, thereby improving the uniformity of the nitrogen foam generated by the foam homogenizer 101. The nitrogen foam with a finer and more uniform texture generates a more uniform pressure on the gas well formation, thereby improving the fracturing effect on the gas well.

[0036] Embodiment 3: Figure 1 , Figure 6 , Figure 7 and Fig. 9 As shown, a connecting plate 402 is fixedly connected to the end face of the first spring 401, and a sliding rod 403 is symmetrically fixedly connected to the outer surface of the connecting plate 402 close to the first spring 401. The sliding rod 403 slides through the outer shell 301 and extends to the outside. A connecting seat 404 is fixedly connected between the end faces of the two sliding rods 403, and a roller 405 is rotatably connected to the inner surface of the connecting seat 404, and the roller 405 is located outside the nozzle 305.

[0037] The use steps of the present invention are as follows: the outer shell 301 can be supported by the setting of the support component 4, and the resilience of the first spring 401 is used to provide support for the connecting plate 402, the sliding rod 403, the connecting seat 404 and the roller 405, so that the roller 405 and the inner wall of the gas well are always kept in contact with each other. When the outer shell 301 is sent in, the rotation of the roller 405 can reduce the friction force, and at the same time, it can avoid the parts on the outside of the outer shell 301 from directly contacting the inner wall of the gas well to cause wear, thereby improving the service life of the foam generator.

[0038] The effect and working principle of the whole mechanism are as follows: when the nitrogen foam generator is used for gas well fracturing, the external component 1 and the connecting component 2 are used in combination, the external component 1 is located on the ground outside the well, the connecting component 2 is supplied with nitrogen foam through the use of the external component 1, and the connecting component 2 delivers nitrogen foam to the well entry component 3. After the well entry component 3 is delivered into the well, the nozzle 305 is used to spray high-pressure nitrogen foam to act on the well wall, and high pressure is applied to the bottom layer of the gas well to form cracks in the bottom rock. The cracks generated by fracturing are used to make natural gas flow into the well from the bottom layer, so as to achieve the purpose of increasing gas production. The nitrogen foam generator can work continuously under the conditions of a delivery pressure of 120MPa and a flow rate of 25 cubic meters per minute, achieving high pressure and high stability. The purpose of qualitative fracturing of the gas well is to effectively increase the gas production of the gas well. When the fluid is transported outside the well through the external component 1, the fracturing fluid is transported into the foam homogenizer 101 through the connection of the liquid inlet pipe 104, and the nitrogen is transported into the foam homogenizer 101 through the connection of the air inlet pipe 107. The fracturing fluid and the nitrogen are both in a high-pressure state. The fracturing fluid will enter the foam homogenizer 101 through the connection of the multiple first staggered tubes 103, and the nitrogen will enter the foam homogenizer 101 through the connection of the outer sleeve 106 and the multiple second staggered tubes 105. After the fracturing fluid and the nitrogen enter the foam homogenizer 101, the fracturing fluid and the nitrogen are introduced into the mixing chamber inside the foam homogenizer 101, and the high-pressure nitrogen foam generated after mixing will be ejected from the lower end outlet of the foam homogenizer 101. The first staggered tube 103 and the second staggered tube 105 are used in conjunction with each other to connect the fracturing fluid and the nitrogen respectively. The first staggered tube 103 and the second staggered tube 105 are distributed in an annular shape and are in a staggered position, which will make the fracturing fluid and the nitrogen entering the foam homogenizer 101 staggered and converge, and the fracturing fluid and the nitrogen can be evenly contacted and mixed, thereby improving the uniformity of the nitrogen foam produced by the foam homogenizer 101. The nitrogen foam with a finer and more uniform texture produces a more uniform pressure on the gas well formation, thereby improving the fracturing effect on the gas well. The nitrogen foam produced by the foam homogenizer 101 will enter the fixed pipe 302 through the connection of the first connector 201, the high-pressure hose 202 and the second connector 203, and pass through the first connector 201 and the second connector 2 03, the protective tube 204 is connected to the high-pressure hose 202. The material of the protective tube 204 and the high-pressure hose 202 is consistent, and both are made of high-strength hose material. Since the protective tube 204 and the high-pressure hose 202 are in an overhead state, no pressure is generated inside the protective tube 204. During the gas well fracturing operation, the protective tube 204 is in contact with the gas well. Therefore, the use of the protective tube 204 can provide protection for the high-pressure hose 202, thereby preventing the high-pressure hose 202, which is circulated with high-pressure medium, from being damaged by long-term friction. At the same time, the gap formed between the protective tube 204 and the high-pressure hose 202 can provide a channel for the power line 206, so that the power line 206 can be used to supply power to the position of the shell 301 entering the well, which effectively improves the functionality of the foam generator.After the outer shell 301 is sent to the fracturing operation position, the gas well formation is fractured by using the high-pressure nitrogen foam transported into the fixed pipe 302. The nitrogen foam will be sprayed out from the nozzle 305 through the connection between the connecting ring 303 and the inner pipe 304. The nitrogen foam sprayed from the nozzle 305 acts on the inner wall of the gas well to perform fracturing operations. While the nitrogen foam is sprayed out from the nozzle 305 for fracturing, the power cord 206 is used to power the waterproof motor 607. After the waterproof motor 607 is started, it can drive the shaft 608 to rotate. The rotation of the shaft 608 can drive the gear 609 to follow the rotation. When the gear 609 rotates, it meshes with the gear ring 603. The rotating ring 602 can be driven to rotate accordingly. The connection between the bearing 601 and the inner wall of the housing 301 provides support for the rotation of the rotating ring 602. The rotation of the rotating ring 602 can drive multiple sets of inclined blocks 604, tooth plates 605 and rubber pads 606 to rotate accordingly. The shape of the inclined block 604 is a triangle with an arc surface on one side and a straight surface on the other side. When the rotating ring 602 rotates, the inclined surface of the inclined block 604 will rotate toward the lever 508. After the inclined surface of the inclined block 604 contacts the lever 508, it can push the lever 508 toward the direction of the fixed sleeve 501. The lever 508 can drive the side plate 503, the insertion rod 504 and the knocking plate 505 to follow the displacement. When the plate 503 moves toward the fixed sleeve 501, it will compress the second spring 502 to shrink. The second spring 502 is a high-strength spring that can generate a large rebound force. As the waterproof motor 607 continues to operate, the lever 508 will break away from the hypotenuse of the inclined block 604. The second spring 502 is in a compressed state, and the lever 508 will correspond to the position of the rubber pad 606 next to the inclined block 604. The lever 508 loses the support of the inclined block 604 at this time. At this time, the rebound force of the second spring 502 can drive the side plate 503, the plug rod 504, the knocking plate 505 and the lever 508 to rebound and reset outward, and the lever 508 will quickly rebound to fit the rubber pad 6 06, the rubber pad 606 is provided to provide soft support to prevent the lever 508 from being damaged by collision. At the same time, the knocking plate 505 uses the rebound force to generate a large impact force on the inner wall of the gas well. At this time, the knocking plate 505 drives the cone head 506 to knock on the inner wall of the gas well. The notch 507 on the surface of the knocking plate 505 is provided to make the knocking plate 505 encounter less resistance when it moves in the fluid. As the rotating ring 602 continues to rotate, the second spring 502 is in a rebound state, and the arc surface of the knocking plate 505 is in a state of fitting the inner wall of the gas well. At this time, the lever 508 will contact the tooth plate 605 through the rubber pad 606, and the tooth plate 605 The surface of the lever 508 is fixed with a plurality of small tooth blocks at intervals, and the small tooth blocks are consistent in shape with the inclined block 604. At this time, the lever 508 contacts the inclined surface of the tooth plate 605. Since the small tooth blocks are smaller than the inclined block 604, the lever 508 is slightly lifted by the tooth plate 605, and the second spring 502 is slightly compressed. Then, the lever 508 moves through the inclined surface of the small tooth block, and the lever 508 loses support, and the second spring 502 continues to rebound.Therefore, when the tooth plate 605 rotates to contact the lever 508, the second spring 502 will repeatedly maintain a small amplitude for compression and rebound, and the knocking plate 505 can maintain a relatively fast frequency to knock on the inner wall of the gas well with a small amplitude, which has a better knocking and crushing effect on the inner wall of the gas well. Next, the next inclined block 604 will pass the position of the lever 508, and the inclined block 604 will push the lever 508 out so that the second spring 502 is fully compressed. After the displacement passes the inclined block 604, the knocking plate 505 continues to knock on the inner wall of the gas well with high intensity. Therefore, as the waterproof motor 607 continues to operate, the knocking The plate 505 and the cone head 506 can repeatedly strike the inner wall of the gas well. The cone head 506 is made of a diamond material with a relatively high hardness. The cone head 506 can impact and crush the inner wall of the gas well by using the impact force of the striking plate 505 on the inner wall of the gas well. The physical contact impact force generated by the cone head 506 can cause the inner wall of the gas well to be struck and broken. In combination with the nitrogen foam sprayed from the nozzle 305, cracks can be quickly generated on the inner wall of the gas well. After the cracks are generated, the nitrogen foam sprayed from the nozzle 305 can quickly penetrate into the cracks and diffuse the cracks, that is, the striking plate 505 When the cone head 506 and the nozzle 305 are used in coordination, the nozzle 305 sprays nitrogen foam while the knocking plate 505 repeatedly knocks the inner wall of the gas well. The direct impact force generated by the knocking causes cracks to form quickly on the inner wall of the gas well. The pressure generated by the nitrogen foam can act from the crack position, making full use of the excellent flow performance of the nitrogen foam so that the nitrogen foam can act on the crack in a shorter time, quickly completing the gas well fracturing operation, reducing the consumption of the nitrogen foam in the stage of impacting the inner wall of the gas well to generate cracks, and completing the gas well fracturing operation while using less materials. When the shell 301 is sent into the gas well for displacement, the support assembly 4 can provide support for the shell 301, and the resilience of the first spring 401 can provide support for the connecting plate 402, the slide bar 403, the connecting seat 404 and the roller 405, so that the roller 405 and the inner wall of the gas well are always kept in contact with each other. When the shell 301 is sent in, the rotation of the roller 405 can reduce the friction force, and at the same time, it can avoid the parts outside the shell 301 from directly contacting with the inner wall of the gas well to cause wear, which plays a role in increasing the service life of the foam generator.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nitrogen foam generator for gas well fracturing, comprising an external component (1), a connecting component (2), a well entry component (3), a supporting component (4), a knocking component (5) and a driving component (6), characterized in that: The external component (1) comprises a foam homogenizer (101); The connecting component (2) is fixedly connected to the lower end surface of the foam homogenizer (101), and the connecting component (2) comprises a first connector (201), the end surface of the first connector (201) is fixedly connected to a high-pressure hose (202), and the end surface of the high-pressure hose (202) is fixedly connected to a second connector (203); The well entry assembly (3) comprises a housing (301), a fixing pipe (302) is fixedly connected to the bottom of the housing (301), an upper end surface of the fixing pipe (302) passes through the housing (301) and extends to the upper side, and an end surface of the fixing pipe (302) is fixedly connected to an end surface of a second connector (203); The number of the support components (4) is set to be multiple, and the multiple support components (4) are evenly fixedly connected to the upper and lower inner surfaces of the housing (301), and the support components (4) include a first spring (401); The knocking assembly (5) is fixedly connected to the outer surface of the fixed tube (302), and the knocking assembly (5) comprises a fixed sleeve (501); The driving assembly (6) is fixedly connected to the housing (301), and the driving assembly (6) comprises a bearing (601) and a waterproof motor (607).

2. The nitrogen foam generator for gas well fracturing according to claim 1, characterized in that: The upper end surface of the foam homogenizer (101) is evenly and fixedly connected to a plurality of confluence pipes (102); the confluence pipes (102) are distributed in a circumference and are in a connected state with the foam homogenizer (101); the upper end surfaces of several confluence pipes (102) are fixedly connected to first staggered pipes (103); the upper end surfaces of several other confluence pipes (102) are fixedly connected to second staggered pipes (105); the first staggered pipes (103) and the second staggered pipes (105) are in a staggered state.

3. The nitrogen foam generator for gas well fracturing according to claim 2, characterized in that: A liquid inlet pipe (104) is fixedly connected between the upper end surfaces of the plurality of first staggered tubes (103), an outer sleeve (106) is fixedly connected between the upper end surfaces of the plurality of second staggered tubes (105), and an air inlet pipe (107) is fixedly connected to the outer surface of the outer sleeve (106).

4. The nitrogen foam generator for gas well fracturing according to claim 1, characterized in that: A protective tube (204) is fixedly connected between the first connector (201) and the second connector (203); the protective tube (204) is located outside the high-pressure hose (202); a side tube (205) is fixedly connected to the outer surface of the protective tube (204); a power line (206) is arranged inside the side tube (205); the power line (206) extends to a position between the high-pressure hose (202) and the protective tube (204); and the other end of the power line (206) passes through the protective tube (204) and extends to the outside.

5. The nitrogen foam generator for gas well fracturing according to claim 1, characterized in that: The outer surface of the fixed tube (302) is symmetrically fixedly connected with a connecting ring (303), the outer surface of the connecting ring (303) is evenly fixedly connected with a plurality of inner tubes (304), the end surface of the inner tube (304) is fixedly connected to the inner surface of the outer shell (301), and the outer surface of the outer shell (301) is evenly fixedly connected with two groups of nozzles (305), the number of the nozzles (305) is the same as that of the inner tubes (304), and the plurality of nozzles (305) are respectively connected with the plurality of inner tubes (304).

6. The nitrogen foam generator for gas well fracturing according to claim 5, characterized in that: The end surface of the first spring (401) is fixedly connected to a connecting plate (402), and the outer surface of the connecting plate (402) close to the first spring (401) is symmetrically fixedly connected to a sliding rod (403), and the sliding rod (403) slides through the outer shell (301) and extends to the outside, and a connecting seat (404) is fixedly connected between the end surfaces of the two sliding rods (403), and the inner surface of the connecting seat (404) is rotatably connected to a roller (405), and the roller (405) is located at the outer side of the nozzle (305).

7. The nitrogen foam generator for gas well fracturing according to claim 1, characterized in that: The outer surface of the fixing sleeve (501) is fixedly connected to a plurality of groups of second springs (502); the end surfaces of the plurality of groups of second springs (502) are fixedly connected to side plates (503); the outer surface of the side plate (503) is fixedly connected to an insertion rod (504); the insertion rod (504) slides through the outer shell (301) and extends to the outside.

8. The nitrogen foam generator for gas well fracturing according to claim 7, characterized in that: The end surface of the insertion rod (504) is fixedly connected to a knocking plate (505), the cross section of the knocking plate (505) is arc-shaped, a plurality of cone heads (506) are evenly fixedly connected to the outer surface of the knocking plate (505), a plurality of notches (507) are equidistantly provided on the outer surface of the knocking plate (505), and a lever (508) is fixedly connected to the top of the side plate (503).

9. The nitrogen foam generator for gas well fracturing according to claim 4, characterized in that: The bearing (601) is fixedly connected to the inner surface of the housing (301); a rotating ring (602) is fixedly connected to the inner surface of the bearing (601); a gear ring (603) is fixedly connected to the top of the rotating ring (602); a plurality of inclined blocks (604), tooth plates (605) and rubber pads (606) are evenly fixedly connected to the inner surface of the rotating ring (602); the inclined blocks (604), tooth plates (605) and rubber pads (606) are distributed in a ring shape; the waterproof motor (607) is fixedly connected to the top of the housing (301); the upper end surface of the waterproof motor (607) is fixedly connected to the lower end surface of the side tube (205); and the waterproof motor (607) is electrically connected to the power line (206).

10. The nitrogen foam generator for gas well fracturing according to claim 9, characterized in that: The output end of the waterproof motor (607) passes through the housing (301) and extends to the inside. The output end of the waterproof motor (607) is fixedly connected to a rotating shaft (608). The lower end surface of the rotating shaft (608) is fixedly connected to a gear (609). The gear (609) is meshingly connected to the gear ring (603).

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