A nitrogen foam generator for gas well fracturing

Abstract

The present invention discloses a nitrogen foam generator for gas well fracturing, which relates to the technical field of gas well fracturing, and comprises 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. In the present invention, while the nitrogen foam is ejected from the nozzle position, the knocking plate repeatedly knocks on the inner wall of the gas well, and the direct impact force generated by the knocking causes cracks to be quickly generated 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 relatively short 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 material, effectively reducing the construction cost of the gas well fracturing operation and improving the fracturing efficiency.

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] A nitrogen foam generator is a device used to produce nitrogen foam during the gas well fracturing process. Gas well fracturing is achieved by 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 channels 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 rock formation surface. According to the principles of fluid mechanics, when the fluid encounters an obstacle, it will produce a bypass phenomenon, 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 construction costs.

[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 proposed in the above background art that the impact of nitrogen foam 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 objectives, 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 includes a foam homogenizer; the connecting component is fixedly connected to the lower end face of the foam homogenizer, the connecting component includes a first connector, the end face of the first connector is fixedly connected to a high-pressure hose, and the end face of the high-pressure hose is fixedly connected to a second connector; the well entry component includes an outer shell, the inner bottom of the outer shell is fixedly connected to a fixed pipe, the upper end face of the fixed pipe passes through the outer shell and extends to the upper side, and the end face of the fixed pipe is fixedly connected to the end face 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 includes a first spring; the knocking component is fixedly connected to the outer surface of the fixed pipe, and the knocking component includes a fixed sleeve; the driving component is fixedly connected to the outer shell, and the driving component includes a bearing and a waterproof motor.

[0007] Preferably, the upper end surface of the foam homogenizer is evenly and fixedly connected to 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 to a first staggered pipe, and the upper end surfaces of several other confluence pipes are fixedly connected to a second staggered pipe, and the first staggered pipe and the second staggered pipe 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 to respectively connect the fracturing fluid and nitrogen. The first staggered tube and the second staggered tube are distributed in a ring shape and are in a staggered position. This will cause the fracturing fluid and nitrogen entering the foam homogenizer to intersect and converge, and the fracturing fluid and 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 provided inside the side tube, the power cord extends to the 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, 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 internal connecting tubes are evenly fixedly connected to the outer surface of the connecting ring, the end face of the internal connecting tube is fixedly connected to the inner surface of the outer shell, and 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 internal connecting tubes, and the plurality of nozzles are respectively connected to the plurality of internal connecting 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 end face of the first spring is fixedly connected to a connecting plate, and the outer surface of the connecting plate close to the first spring is symmetrically fixedly connected to 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 end faces of the sliding rod, and the inner surface of the connecting seat is rotatably connected to a roller, 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 friction, and at the same time, it can avoid direct contact and wear between the components on the outer side of the outer shell and the inner wall of the gas well, thereby improving the service life of the foam generator.

[0017] Preferably, multiple groups of second springs are fixedly connected to the outer surface of the fixed sleeve, and side plates are fixedly connected between the end surfaces of the multiple groups of second springs. The outer surface of the side plate is fixedly connected to an insertion rod, 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 assisting fracturing.

[0019] Preferably, the end face of the insertion rod is fixedly connected to a knocking plate, the cross-section of the knocking plate is arc-shaped, a plurality of cone heads are evenly fixedly connected to the outer surface of the knocking plate, a plurality of slots are equidistantly provided on the outer surface of the knocking plate, and a shift rod 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 exerted by 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 housing, 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 housing, 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 solution, the setting of the inclined block can push the lever toward the fixed sleeve, and when the side plate moves toward the fixed sleeve, the second spring will be compressed to shrink. The rebound force of the second spring can drive the side plate, the insertion rod, the knocking plate and the lever 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 setting of the rubber pad provides 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. 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 to a rotating shaft. The lower end surface of the rotating shaft is fixedly connected to a gear. The gear is meshed with a gear ring.

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

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 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 the inner wall of the gas well. The direct impact force generated by the knocking causes cracks to be quickly generated 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 can act on the cracks in a relatively short 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 material, 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.

[0027] 2. In the present invention, the first staggered tube and the second staggered tube are used in conjunction to connect the fracturing fluid and nitrogen respectively. The first staggered tube and the second staggered tube are distributed in a ring shape and are in a staggered position. This will cause the fracturing fluid and nitrogen entering the foam homogenizer to intersect and converge, and the fracturing fluid and 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.

[0028] 3. In the present invention, the outer shell can be supported by the setting of the support assembly, and the rebound force of the first spring is 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 direct contact and wear between the components on the outside of the outer shell and the inner wall of the gas well, thereby improving the service life of the foam generator.

[0029] 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, avoiding the high-pressure hose through which the high-pressure medium flows 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

[0030] Figure 1 This is a three-dimensional diagram of a nitrogen foam generator for gas well fracturing according to the present invention;

[0031] 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;

[0032] 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;

[0033] 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;

[0034] 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;

[0035] 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;

[0036] 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;

[0037] 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;

[0038] Figure 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;

[0039] Figure 10 This is a schematic structural diagram of a knocking assembly of a nitrogen foam generator for gas well fracturing according to the present invention;

[0040] Figure 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;

[0041] Figure 12 This is a schematic diagram of the rotating ring structure of a nitrogen foam generator for gas well fracturing according to the present invention.

[0042] Figure: 1. External assembly; 101. Foam homogenizer; 102. Inlet pipe; 103. First interlaced pipe; 104. Liquid inlet pipe; 105. Second interlaced pipe; 106. Outer sleeve; 107. Air inlet pipe; 2. Connecting assembly; 201. First connector; 202. High-pressure hose; 203. Second connector; 204. Protective pipe; 205. Side pipe; 206. Power cord; 3. Well entry assembly; 301. Outer shell; 302. Fixed pipe; 303. Connecting ring; 304. Internal pipe; 305. Sprinkler; 4. Support assembly 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, inserting rod; 505, knocking plate; 506, cone head; 507, notch; 508, shift rod; 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

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figures 1-12As 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, the external component 1 comprising a foam homogenizer 101; the connecting component 2 is fixedly connected to the lower end face of the foam homogenizer 101, the connecting component 2 comprises a first connector 201, the end face of the first connector 201 is fixedly connected to a high-pressure hose 202, and the end face 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 face of the fixed pipe 302 passes through the shell 301 and extends to the upper side, and the end face of the fixed pipe 302 is fixedly connected to the end face 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 upper and lower inner surfaces 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 fixing sleeve 501;The drive assembly 6 is fixedly connected to the housing 301. The drive assembly 6 includes a bearing 601 and a waterproof motor 607. The upper end surface of the foam homogenizer 101 is evenly fixedly connected to a plurality of inlet pipes 102. The inlet pipes 102 are distributed circumferentially and are in communication 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. The upper end surfaces of the plurality of first staggered pipes 103 are fixedly connected to the liquid inlet pipe 104, and the upper end surfaces of the plurality of second staggered pipes 105 are fixedly connected to the outer sleeve 106. 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, the outer surface of the protective tube 204 is fixedly connected to a side tube 205, 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 passes through the protective tube 204 and extends to the outside, 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 face of the inner tube 304 is fixedly connected to the inner surface of the shell 301, the outer surface of the shell 301 is evenly fixedly connected with two groups of nozzles 305, the nozzles 305 The number is consistent with the internal pipe 304, and the multiple nozzles 305 are connected to the multiple internal pipes 304 respectively. The outer surface of the fixed sleeve 501 is fixedly connected to multiple groups of second springs 502, and the end faces of the multiple groups of second springs 502 are fixedly connected to the side plates 503. The outer surface of the side plates 503 is fixedly connected to the insertion rod 504, and the insertion rod 504 slides through the outer shell 301 and extends to the outside. The end face of the insertion rod 504 is fixedly connected to the knocking plate 505. The cross-section of the knocking plate 505 is arc-shaped, and the outer surface of the knocking plate 505 is evenly fixedly connected to multiple cone heads 506. The outer surface of the knocking plate 505 is equidistantly provided with multiple notches 507. The top of the side plate 503 is fixedly connected to the lever 508, and the bearing 601 is fixedly connected to the inner surface of the outer shell 301. A rotating ring 602 is fixedly connected to the inner surface of bearing 601, and a gear ring 603 is fixedly connected to the top of 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 rotating ring 602. The inclined blocks 604, tooth plates 605, and rubber pads 606 are arranged in a ring. A waterproof motor 607 is fixedly connected to the top of housing 301. The upper end surface of waterproof motor 607 is fixedly connected to the lower end surface of side tube 205. Waterproof motor 607 is electrically connected to power cord 206. The output end of waterproof motor 607 passes through housing 301 and extends to the inside. The output end of waterproof motor 607 is fixedly connected to rotating shaft 608. The lower end surface of rotating shaft 608 is fixedly connected to gear 609. Gear 609 meshes with gear ring 603.

[0045] The present invention uses the following steps: when the nitrogen foam generator is used for gas well fracturing, the fracturing fluid is transported into the foam homogenizer 101 through the liquid inlet pipe 104, and the nitrogen is transported into the foam homogenizer 101 through the air inlet pipe 107. After the fracturing fluid and 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 protection 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 supplied with electric energy, and the nitrogen foam sprayed from the nozzle 305 acts on the inner wall of the gas well to perform a fracturing operation. While the nitrogen foam is sprayed from the nozzle 305 to perform a fracturing operation, 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 shift rod 508, it can push the shift rod 508 toward the fixed sleeve 501, compressing the second spring 502 to contract. As the waterproof motor 607 continues to operate, the lever 508 will break away from the bevel of the inclined 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 setting of the rubber pad 606 provides soft support, and 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 with 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 cause cracks to form on the inner wall of the gas well. After the cracks are formed, 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 cracks to form on the inner wall of the gas well quickly. 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 can act on the cracks in a relatively short time, and the gas well fracturing operation is quickly completed.

[0046] Example 2: Figure 1-Figure 3As shown, the upper end surface of the foam homogenizer 101 is evenly and fixedly connected with a plurality of confluence pipes 102, which 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 with the first staggered pipes 103, and the upper end surfaces of several other confluence pipes 102 are fixedly connected with the second staggered pipes 105, the first staggered pipes 103 and the second staggered pipes 105 are staggered, the upper end surfaces of the plurality of first staggered pipes 103 are fixedly connected with the liquid inlet pipe 104, the upper end surfaces of the plurality of second staggered pipes 105 are fixedly connected with the outer sleeve 106, and the outer surface of the outer sleeve 106 is fixedly connected with the air inlet pipe 107.

[0047] The present invention uses a first staggered tube 103 and a second staggered tube 105 to respectively connect the fracturing fluid and nitrogen. The first staggered tube 103 and the second staggered tube 105 are distributed in a ring shape and are in a staggered position. This will cause the fracturing fluid and nitrogen entering the foam homogenizer 101 to intersect and converge, and the fracturing fluid and 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 generates a more uniform pressure on the gas well formation, thereby improving the fracturing effect on the gas well.

[0048] Example 3: Figure 1 、 Figure 6 、 Figure 7 and Figure 9 As shown, the end face 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, 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 faces 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 outside the nozzle 305.

[0049] The usage 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 rebound force 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.

[0050] The effect and working principle of the entire mechanism are as follows: when using the nitrogen foam generator for gas well fracturing operations, through the coordinated use of the external component 1 and the connecting component 2, the external component 1 is located on the ground outside the well, and the external component 1 is used to supply nitrogen foam to the connecting component 2, and the connecting component 2 transports the nitrogen foam to the well entry component 3. After the well entry component 3 is sent into the well, the nozzle 305 position is used to spray high-pressure nitrogen foam to act on the well wall, applying high pressure to the bottom layer of the gas well to form cracks in the bottom rock, and utilizing the cracks generated by fracturing to allow natural gas to flow from the bottom layer into the well, thereby achieving the purpose of increasing gas production. The nitrogen foam generator can work continuously under the conditions of a delivery pressure of 120 MPa 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 to the foam homogenizer 101 through the connection of the liquid inlet pipe 104, and the nitrogen is transported to 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 multiple first staggered pipes 103, and the nitrogen will enter the foam homogenizer 101 through the connection of the outer sleeve 106 and the multiple second staggered pipes 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. 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 manner 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 is consistent with that of the high-pressure hose 202, and both are made of a relatively 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, avoiding long-term friction damage to the high-pressure hose 202 that circulates the high-pressure medium inside. 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, effectively improving 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 internal pipe 304. The nitrogen foam sprayed from the nozzle 305 acts on the inner wall of the gas well to perform a fracturing operation. While the nitrogen foam is sprayed 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 rotate accordingly. When the gear 609 rotates, it meshes with the gear ring 603. The rotating ring 602 can be driven to rotate along with it. 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 along with it. 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 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 has lost 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 insertion 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 opened, so that the knocking plate 505 is subjected to less resistance when displacing 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. The small tooth blocks have the same shape as 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 past the inclined surface of the small tooth block, and the lever 508 loses its 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 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 by using the impact force exerted by the knocking 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 knocked 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, when the knocking plate 505 is struck, the inner wall of the gas well is broken. 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 relatively short 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 material. During the cracking operation, when the shell 301 is inserted into the gas well for displacement, the support assembly 4 can provide support for the shell 301. The resilience of the first spring 401 provides support for the connecting plate 402, the sliding rod 403, the connecting seat 404, and the roller 405, so that the roller 405 always maintains a close contact with the inner wall of the gas well. When the shell 301 is inserted, the rotation of the roller 405 can reduce friction and prevent direct contact and wear between the outer parts of the shell 301 and the inner wall of the gas well, thereby extending the service life of the foam generator.

[0051] 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 scope of protection 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) includes a foam homogenizer (101); The communication component (2) is fixedly connected to the lower end surface of the foam homogenizer (101), and the communication 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 the end surface of the fixing pipe (302) is fixedly connected to the end surface of the 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) includes a fixed sleeve (501), the outer surface of the fixed sleeve (501) is fixedly connected to multiple groups of second springs (502), and the end surfaces of the multiple groups of second springs (502) are fixedly connected to the side plates (503), the outer surface of the side plates (503) is fixedly connected to the insertion rod (504), the insertion rod (504) slides through the shell (301) and extends to the outside, the end surface of the insertion rod (504) is fixedly connected to the knocking plate (505), the cross section of the knocking plate (505) is arc-shaped, the outer surface of the knocking plate (505) is evenly fixedly connected to multiple cone heads (506), the outer surface of the knocking plate (505) is equidistantly provided with multiple notches (507), and the top of the side plates (503) is fixedly connected to a shifting rod (508); The drive assembly (6) is fixedly connected to the housing (301), and the drive 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 circumferential manner and are in a state of communication with the foam homogenizer (101), wherein the upper end surfaces of several confluence pipes (102) are fixedly connected to first staggered pipes (103), and the upper end surfaces of several other confluence pipes (102) are fixedly connected to second staggered pipes (105), and 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) being located outside the high-pressure hose (202), a side tube (205) being fixedly connected to the outer surface of the protective tube (204), a power line (206) being provided inside the side tube (205), the power line (206) extending to a position between the high-pressure hose (202) and the protective tube (204), and the other end of the power line (206) passing through the protective tube (204) and extending 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 to a connecting ring (303), the outer surface of the connecting ring (303) is evenly fixedly connected to a plurality of internal connecting tubes (304), the end faces of the internal connecting tubes (304) are fixedly connected to the inner surface of the outer shell (301), and the outer surface of the outer shell (301) is evenly fixedly connected to two groups of nozzles (305), the number of the nozzles (305) is the same as that of the internal connecting tubes (304), and the plurality of nozzles (305) are respectively in a state of communication with the plurality of internal connecting tubes (304).

6. The nitrogen foam generator for gas well fracturing according to claim 5, characterized in that: The end face 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 housing (301) and extends to the outside, and a connecting seat (404) is fixedly connected between the end faces 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 outside the nozzle (305).

7. 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), the inner surface of the bearing (601) is fixedly connected to a rotating ring (602), the top of the rotating ring (602) is fixedly connected to a gear ring (603), the inner surface of the rotating ring (602) is evenly fixedly connected to 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), and the waterproof motor (607) is electrically connected to the power line (206).

8. The nitrogen foam generator for gas well fracturing according to claim 7, characterized in that: The output end of the waterproof motor (607) passes through the housing (301) and extends to the inner side. 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 meshed with the gear ring (603).

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