Nitrogen oil displacement compression system for oilfield exploitation

Abstract

The invention discloses a nitrogen oil displacement compression system for oilfield exploitation, and belongs to the related field of oilfield exploitation technologies, the nitrogen oil displacement compression system comprises a fixed base, a compressor and a cooling piece, the compressor is fixedly mounted at the upper end of the fixed base, the cooling piece is fixedly mounted above the compressor, and the cooling piece comprises a limiting clamping frame and a plurality of groups of cooling sleeves; a heat exchange pipe is spliced and installed in the middle of the inner side of each cooling sleeve, flange plates are arranged at the two ends of each heat exchange pipe, flange rings are fixedly installed at the two ends of each cooling sleeve, the heat exchange pipes and the cooling sleeves are in butt joint and fixed through the flange plates and the flange rings, and the multiple sets of cooling sleeves are in through connection through connectors. The plurality of groups of heat exchange pipes are connected through connecting water jacket pipelines; according to the utility model, the heat exchanger is provided with a combined cooling installation structure, the heat exchange tube and the sleeve can be disassembled and assembled, the stability of the heat dissipation structure is improved, a traditional welding type fixing mode is replaced, and meanwhile, the sealing performance is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field related to oilfield exploitation, and more specifically, it is a nitrogen gas flooding compression system for oilfield exploitation. Background Art

[0002] The nitrogen gas flooding compression system for oilfield exploitation mainly injects a nitrogen gas source into an oilfield or an oil well, and relies on gas pressure to drive out the oil liquid. The nitrogen gas is injected into the oil reservoir at high pressure, replacing the crude oil to flow towards the production well, maintaining the formation pressure, and extending the crude oil exploitation cycle. The nitrogen gas molecules are small and have low viscosity, can penetrate deep into the oil layer, displace the crude oil and reduce its viscosity, and improve the fluidity.

[0003] The patent document with the publication number of CN221299420U records a nitrogen gas compression device, which belongs to the technical field of nitrogen gas compression. Its technical solution is as follows: It includes a nitrogen gas compressor, the nitrogen gas compressor is connected to an oil fine separator, and the oil fine separator is connected to at least one oil cooler; both ends of the oil cooler are partitioned into a water inlet chamber and a water outlet chamber by partition plates respectively, the middle part is an oil chamber, an oil inlet and an oil outlet are respectively arranged at both ends of the oil chamber, the oil cooler is connected to the oil fine separator through the oil inlet, and is connected to the nitrogen gas compressor through the oil outlet; a water inlet is arranged on the water inlet chamber of the oil cooler, a water outlet is arranged on the water outlet chamber, the water inlet is connected with a cooling water inlet and a hot water inlet, and the water outlet is connected with a cooling water outlet and a hot water outlet; a plurality of water pipes are connected between the two partition plates to communicate the water inlet chamber and the water outlet chamber; it can prevent the problem that the fluidity of the lubricating oil decreases and the lubrication effect becomes poor due to too low temperature.

[0004] The above device has certain deficiencies during the nitrogen gas treatment operation. In order to inject the nitrogen gas source into an oilfield or an oil well, generally, the nitrogen gas is pressurized by a compressor, and the temperature of the pressurized nitrogen gas rises. Direct injection into the oilfield will cause a high-temperature reaction with the crude oil. Therefore, it is necessary to cool the pressurized nitrogen gas. However, the traditional cooling structure adopts an integrated setting and is fixed by a welded structure, making the entire cooler unable to disassemble and clean the heat exchange tubes and the casing, and it is easy to have a blocking phenomenon during long-term use, affecting its long-term use effect; secondly, the traditional combined structure generally uses a threaded structure for fixation, increasing the operation difficulty during the combined installation of the heat exchange tubes and the casing, and unable to complete the disassembly and installation between several groups of heat exchange tubes and between several groups of casings; secondly, although the quick-disassembly installation structure is convenient for installation, its stability is poor, and under the action of external force, it is easy for several groups of heat exchange tubes and several groups of casings to fall off. Summary of the Invention

[0005] The purpose of the present invention is to provide a nitrogen gas flooding compression system for oilfield exploitation, which can solve the existing problems.

[0006] The problems solved by the present invention are:

[0007] 1. To inject nitrogen gas into an oilfield or oil well, the nitrogen gas is generally pressurized by a compressor. After pressurization, the temperature of the nitrogen gas rises. If it is directly injected into the oilfield, it will react with the crude oil at high temperature. Therefore, it is necessary to cool the pressurized nitrogen gas. The traditional cooling structure is integrally arranged and fixed by a welded structure, which makes it impossible to disassemble and clean the heat exchange tubes and sleeves of the entire cooler, and it is easy to be blocked during long-term use, affecting its long-term use effect. Secondly, the traditional combined structure generally uses a threaded structure for fixation, which increases the operation difficulty when assembling and installing the heat exchange tubes and sleeves, and it is impossible to disassemble and install between several groups of heat exchange tubes and between several groups of sleeves. Secondly, although the quick-disassembly installation structure is convenient to install, its stability is poor, and under the action of external forces, it is easy for several groups of heat exchange tubes and several groups of sleeves to fall off from each other.

[0008] The object of the present invention can be achieved by the following technical solutions:

[0009] A nitrogen gas displacement compression system for oilfield exploitation includes a fixed base, a compressor and a cooling member. The compressor is fixedly installed at the upper end of the fixed base, and the cooling member is fixedly installed above the compressor. The cooling member includes a limit card frame and several groups of cooling sleeves. A heat exchange tube is spliced and installed in the middle of the inner side of the cooling sleeve. Flange plates are provided at both ends of the heat exchange tube, and flange rings are fixedly installed at both ends of the cooling sleeve. The heat exchange tube and the cooling sleeve are butt-jointed and fixed through the flange plates and the flange rings. Several groups of cooling sleeves are connected through a connector in a through manner, and several groups of heat exchange tubes are connected through a connecting water jacket pipeline. Several groups of cooling sleeves are all spliced and installed inside the limit card frame.

[0010] As a further technical solution of the present invention, sealing plugs are sleeved on the outer surfaces of both ends of the heat exchange tube, and sealing sleeves for cooperating with the sealing plugs are provided on the inner sides of both ends of the cooling sleeve. A fixed collar is provided at one end of the sealing sleeve. When fixing the heat exchange tube and the cooling sleeve, the sealing plugs are used to butt against the sealing sleeves, which can effectively improve the airtightness between the ends of the heat exchange tube and the cooling sleeve. During the operation, first, the sealing sleeves are respectively sleeved on the inner sides of both ends of the cooling sleeve, then the heat exchange tube is inserted into the middle of the cooling sleeve, the sealing plugs are sleeved on the outer surface of the heat exchange tube, and by pushing the sealing plugs, the sealing plugs are inserted into the docking grooves of the sealing sleeves. At the same time, the fixed collars of the sealing plugs and the sealing sleeves are both placed between the flange plates and the flange rings. After the flange plates and the flange rings are fixed, the fixed collars are squeezed to complete the sealing operation of the heat exchange tube and the cooling sleeve.

[0011] As a further technical solution of the present invention, the overall shape of the sealing plug is a frustum structure, and there is a docking groove inside the sealing sleeve for cooperating with the sealing plug. Fixed collar rings are provided at the ends of both the sealing plug and the sealing sleeve. An airtight ring is provided on the outer side of the sealing sleeve. The fixed collar rings are attached to the surfaces of the flange plate and the flange ring. After the flange plate and the flange ring are fixed, the fixed collar rings are squeezed to improve their sealing effect. Secondly, for the frustum-shaped sealing plug, when the sealing plug is inserted into the docking groove, the sealing plug squeezes the sealing sleeve, causing the sealing sleeve to be in close contact with the inside of the cooling sleeve. The sealing plug and the sealing sleeve form an insertion-type sealing structure, which can effectively increase its sealing contact surface compared with the traditional sealing ring and avoid leakage.

[0012] As a further technical solution of the present invention, a communication groove is provided inside the connecting water jacket. A sealing cone for cooperating with the connecting water jacket is fixedly installed at the end of the heat exchange tube. The sealing cone and the heat exchange tube are fixed by threads. When the sealing cone and the heat exchange tube are docked, raw tape can be wound around the surface of the heat exchange tube to improve the sealing performance between the sealing cone and the heat exchange tube. The setting of the connecting water jacket enables quick-disassembly installation operations between two groups of heat exchange tubes. By pressing the connecting water jacket, the docking sleeve of the connecting water jacket is simultaneously docked with the sealing cones of the two heat exchange tubes, completing the connection and fixation between the two heat exchange tubes. The setting of multiple connecting water jackets enables several groups of heat exchange tubes to form an S-shaped water path structure.

[0013] As a further technical solution of the present invention, several groups of annular structures are provided on the outer surface of the sealing cone, and the diameters of the several groups of annular structures gradually decrease from top to bottom. A docking sleeve for cooperating with the sealing cone is provided inside the connecting water jacket. With the setting of the conical sealing cone, when the connecting water jacket performs a quick connection operation on the heat exchange tube, the docking resistance can be reduced. At the same time, after the sealing cone and the docking sleeve are docked, the setting of several groups of annular structures can increase the contact surface between the sealing cone and the docking sleeve, improving its airtightness while ensuring the quick connection effect of the sealing cone and the docking sleeve.

[0014] As a further technical solution of the present invention, diversion tubes are fixedly installed on the outer surfaces of both ends of the connector. Sealing cones are fixedly sleeved at the ends of the diversion tubes and the heat exchange tubes. The coolant is introduced into the cooling sleeve through the liquid inlet pipe, causing the coolant to circulate between several groups of cooling sleeves and be discharged outward through the drain pipe. With the setting of the sealing cone and the cooperation with the docking sleeve, a quick-installation structure is provided between two groups of cooling sleeves, facilitating the rapid composition of several groups of cooling sleeves. During operation, the connector is placed between two groups of cooling sleeves. By pressing the two groups of cooling sleeves, the sealing cone cooperates with the docking sleeve to complete the quick docking between the two groups of cooling sleeves, facilitating the S-shaped series installation between several groups of two cooling sleeves.

[0015] As a further technical solution of the present invention, a number of fixed clamping strips for cooperating with the cooling sleeve are fixedly installed inside the limit clamping frame. A splicing frame is installed on the upper part of the fixed clamping strip, and the cooling sleeve is fixed between the fixed clamping strip and the splicing frame. Since a connector is used for rapid installation between a number of cooling sleeves, in order to avoid the phenomenon that the assembled cooling sleeves fall off, by adding the fixed clamping strip and the splicing frame, the fixed clamping strip and the splicing frame are clamped on the outer surfaces of a number of cooling sleeves, playing a role in limiting and fixing the installation of a number of cooling sleeves.

[0016] As a further technical solution of the present invention, semi-circular clamping grooves for cooperating with the cooling sleeve are provided on the surfaces of the fixed clamping strip and the splicing frame. The fixed clamping strip and the splicing frame are fixed by a bolt body. The user clamps the cooling sleeve in the semi-circular clamping grooves of the fixed clamping strip and the splicing frame, and uses the bolt body to lock the fixed clamping strip and the splicing frame to complete the installation and fixation of the cooling sleeve.

[0017] As a further technical solution of the present invention, a number of limit clamping seats for cooperating with the connecting water sleeve are fixedly installed inside the limit clamping frame. A docking groove is provided on the side of the connecting water sleeve. Since a connecting water sleeve is used for rapid installation between a number of heat exchange tubes, in order to solve the problem of looseness between the heat exchange tubes and the connecting water sleeve, by adding the limit clamping seats, the installed connecting water sleeve is limited and fixed by the limit clamping seats, avoiding looseness and falling off between the heat exchange tubes and the connecting water sleeve. At the same time, the fixed clamping strip, the splicing frame and the limit clamping seats are loaded in the limit clamping frame, so as to simultaneously meet the reinforcement operations for the cooling sleeve and the heat exchange tube during the assembly of the cooling member.

[0018] As a further technical solution of the present invention, a compression chamber is fixedly installed on the upper part of the compressor, and an air inlet pipe is provided at one end of the compression chamber. The other end of the compression chamber is connected to the cooling member through a communication pipe. A number of limit clamping frames are butt-jointed and fixed through a fixed housing. An electric motor is installed at one end of the compressor. Nitrogen is injected into the interior of the compression chamber through the air inlet pipe, and the compressor is used to pressurize the nitrogen. The temperature of the pressurized nitrogen rises. In order to avoid its reaction with the crude oil, it is necessary to perform a cooling operation. The pressurized nitrogen is introduced into the interior of the cooling member through the communication pipe for cooling operation. The nitrogen source is injected into the oil field or the oil well, and the oil liquid is exploited by relying on the gas pressure.

[0019] The beneficial effects of the present invention:

[0020] 1. By providing a flange ring and a flange plate, when the nitrogen flooding compression system for oil field exploitation is used, it has a combined cooling installation structure, enabling disassembly and assembly operations between its heat exchange tubes and sleeves, replacing the traditional welding fixing method, and at the same time ensuring its sealing performance;

[0021] During operation, when fixing between the heat exchange tube and the cooling sleeve, by using a sealing plug to dock with the sealing sleeve, the airtightness between the ends of the heat exchange tube and the cooling sleeve can be effectively improved. During operation, first, the sealing sleeves are respectively sleeved on the inner sides of both ends of the cooling sleeve, then the heat exchange tube is inserted into the middle of the cooling sleeve, and the sealing plug is sleeved on the outer surface of the heat exchange tube. By pushing the sealing plug, the sealing plug is inserted into the docking groove of the sealing sleeve. At the same time, both the fixing collar of the sealing plug and the sealing sleeve are placed between the flange plate and the flange ring. After the flange plate and the flange ring are fixed, the fixing collar is squeezed to complete the sealing operation of the heat exchange tube and the cooling sleeve. After the flange plate and the flange ring are fixed, the fixing collar is squeezed to improve its sealing effect. Secondly, for the sealing plug with a frustum-shaped structure, when the sealing plug is inserted into the inner part of the docking groove, the sealing plug squeezes the sealing sleeve, making the sealing sleeve in close contact with the inside of the cooling sleeve. The sealing plug and the sealing sleeve form an inserted sealing structure, which can effectively increase its sealing contact surface compared with the traditional sealing ring and avoid leakage. Secondly, the flange ring and the flange plate are fixed by bolts, so that the heat exchange tube and the cooling sleeve are assembled and fixed. After long-term use, the heat exchange tube can be pulled out from the cooling sleeve, and the inside of the cooling sleeve can be flushed and cleaned to keep it in a good unobstructed state.

[0022] 2. By setting up a connector and a connecting water jacket, when the nitrogen flooding compression system for oilfield exploitation is in use, the use of its combined cooling structure is optimized to make it have a quick-disassembly installation structure;

[0023] During use, first, when docking between the sealing cone and the heat exchange tube, raw material tape can be wound around the surface of the heat exchange tube to improve the airtightness between the sealing cone and the heat exchange tube. The setting of the connecting water jacket enables quick-disassembly installation operations between two groups of heat exchange tubes. By pressing the connecting water jacket, the docking clamping sleeve of the connecting water jacket is simultaneously docked with the sealing cones of two heat exchange tubes, so that the two heat exchange tubes are connected and fixed. The setting of multiple connecting water jackets enables several groups of heat exchange tubes to form an S-shaped water path structure. With the setting of the conical sealing cone, when the connecting water jacket performs a quick connection operation on the heat exchange tube, the docking resistance can be reduced. At the same time, after the sealing cone and the docking clamping sleeve are docked, the setting of several groups of ring-shaped structures can increase the contact surface between the sealing cone and the docking clamping sleeve, improving its airtightness while ensuring the quick connection effect of the sealing cone and the docking clamping sleeve;

[0024] Secondly, with the setting of the sealing cone and the use of the docking clamping sleeve, a quick-installation structure is provided between two groups of cooling sleeves, facilitating the rapid composition between several groups of cooling sleeves. During operation, the connector is placed between two groups of cooling sleeves. By pressing the two groups of cooling sleeves, with the cooperation of the sealing cone and the docking clamping sleeve, the two groups of cooling sleeves are quickly docked, facilitating the S-shaped series installation between several groups of two cooling sleeves.

[0025] 3. By setting a limit clamping frame, in the nitrogen gas flooding and compression system for oilfield exploitation, the use of the quick-release installation structure of the connector and the connecting water jacket is optimized to improve its structural stability.

[0026] During operation, since a connector is used for quick installation between several groups of cooling jackets, to avoid the phenomenon of the assembled cooling jackets falling off, by adding fixed clamping bars and splicing frames, the fixed clamping bars and splicing frames are clamped on the outer surface of several groups of cooling jackets, playing a role in limiting and fixing the installation of several groups of cooling jackets. Since a connecting water jacket is used for quick installation between several groups of heat exchange tubes, to solve the problem of looseness between the heat exchange tubes and the connecting water jacket, by adding a limit clamping seat, the limit clamping seat is used to limit and fix the installed connecting water jacket, avoiding looseness and falling off between the heat exchange tubes and the connecting water jacket. And the limit clamping frame is loaded with fixed clamping bars, splicing frames and limit clamping seats at the same time, so that when assembling the cooling parts, the reinforcement operations for both the cooling jackets and the heat exchange tubes can be satisfied simultaneously. Brief Description of the Drawings

[0027] The present invention will be further described below with reference to the drawings.

[0028] Figure 1 is the overall structural schematic diagram of a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0029] Figure 2 is the internal structural diagram of the cooling parts in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0030] Figure 3 is the overall structural diagram of the cooling jackets and heat exchange tubes in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0031] Figure 4 is the planar structural diagram of the connecting water jacket in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0032] Figure 5 is the overall structural diagram of the sealing plug in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0033] Figure 6 is the overall structural diagram of the connector in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0034] Figure 7 is the overall structural diagram of the limit clamping frame in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention;

[0035] Figure 8 is the state change diagram of the connecting water jacket during use in a nitrogen gas flooding and compression system for oilfield exploitation according to the present invention.

[0036] In the figure: 1. Fixed base; 2. Compressor; 3. Compression chamber; 4. Electric motor; 5. Fixed housing; 6. Cooling component; 7. Limit clamping frame; 8. Inlet pipe; 9. Connecting pipe; 10. Drain pipe; 11. Liquid inlet pipe; 12. Cooling jacket; 13. Splicing frame; 14. Connector; 15. Heat exchange pipe; 16. Flange ring; 17. Flange plate; 18. Sealing plug; 19. Connecting water jacket; 20. Sealing cone; 21. Docking ferrule; 22. Docking groove; 23. Airtight ring; 24. Fixed collar; 25. Sealing sleeve; 26. Diversion pipe; 27. Fixed clamping strip; 28. Limit clamping seat. Detailed implementation manner

[0037] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0038] As Figure 1-8 shown, a nitrogen gas flooding compression system for oilfield exploitation includes a fixed base 1, a compressor 2 and a cooling component 6. The compressor 2 is fixedly installed at the upper end of the fixed base 1, and the cooling component 6 is fixedly installed above the compressor 2. The cooling component 6 includes a limit clamping frame 7 and several groups of cooling jackets 12. A heat exchange pipe 15 is spliced and installed in the middle of the inner side of the cooling jacket 12. Flange plates 17 are provided at both ends of the heat exchange pipe 15, and flange rings 16 are fixedly installed at both ends of the cooling jacket 12. The heat exchange pipe 15 and the cooling jacket 12 are butt-jointed and fixed through the flange plate 17 and the flange ring 16. Several groups of cooling jackets 12 are connected through the connector 14 in a penetrating manner, and several groups of heat exchange pipes 15 are connected through the connecting water jacket 19 by pipes. Several groups of cooling jackets 12 are all spliced and installed inside the limit clamping frame 7.

[0039] To solve the sealing problem of its combined structure, as Figure 3As shown in the figure, sealing plugs 18 are sleeved on the outer surfaces of both ends of the heat exchange tube 15. Sealing sleeves 25 for cooperating with the sealing plugs 18 are provided on the inner sides of both ends of the cooling sleeve 12. A fixed collar 24 is provided at one end of the sealing sleeve 25. When fixing the heat exchange tube 15 and the cooling sleeve 12, by using the sealing plugs 18 to dock with the sealing sleeves 25, the airtightness between the ends of the heat exchange tube 15 and the cooling sleeve 12 can be effectively improved. During the operation, first, the sealing sleeves 25 are respectively sleeved on the inner sides of both ends of the cooling sleeve 12, then the heat exchange tube 15 is inserted into the middle of the cooling sleeve 12, and the sealing plugs 18 are sleeved on the outer surface of the heat exchange tube 15. By pushing the sealing plugs 18, the sealing plugs 18 are inserted into the docking grooves 22 of the sealing sleeves 25. At the same time, the fixed collars 24 of the sealing plugs 18 and the sealing sleeves 25 are both placed between the flange plate 17 and the flange ring 16. After the flange plate 17 and the flange ring 16 are fixed, the fixed collar 24 is squeezed to complete the sealing operation of the heat exchange tube 15 and the cooling sleeve 12.

[0040] As Figure 5 shown, the overall shape of the sealing plug 18 is a frustum structure, and the inner side of the sealing sleeve 25 has a docking groove 22 for cooperating with the sealing plug 18. Fixed collars 24 are provided at the ends of both the sealing plug 18 and the sealing sleeve 25. An airtight ring 23 is provided on the outer side of the sealing sleeve 25. The fixed collars 24 are in contact with the surfaces of the flange plate 17 and the flange ring 16. After the flange plate 17 and the flange ring 16 are fixed, the fixed collar 24 is squeezed to improve its sealing effect. Secondly, for the frustum-shaped sealing plug 18, when the sealing plug 18 is inserted into the docking groove 22, the sealing plug 18 squeezes the sealing sleeve 25, making the sealing sleeve 25 in close contact with the inside of the cooling sleeve 12. The sealing plug 18 and the sealing sleeve 25 form an insertion-type sealing structure. Compared with the traditional sealing ring, it can effectively increase its sealing contact surface and avoid leakage.

[0041] To solve the problem of its rapid assembly, as Figure 4 shown, a communication groove is provided inside the connecting water jacket 19. A sealing cone 20 for cooperating with the connecting water jacket 19 is fixedly installed at the end of the heat exchange tube 15. The sealing cone 20 and the heat exchange tube 15 are fixed by threads. When docking between the sealing cone 20 and the heat exchange tube 15, raw tape can be wound around the surface of the heat exchange tube 15 to improve the sealing performance between the sealing cone 20 and the heat exchange tube 15. The setting of the connecting water jacket 19 enables quick-disassembly installation operation between two heat exchange tubes 15. By pressing the connecting water jacket 19, the docking sleeves 21 of the connecting water jacket 19 are simultaneously docked with the sealing cones 20 of the two heat exchange tubes 15, completing the connection and fixation between the two heat exchange tubes 15. The setting of multiple connecting water jackets 19 enables several groups of heat exchange tubes 15 to form an S-shaped water path structure.

[0042] The outer surface of the sealing cone 20 is provided with several groups of annular structures, and the diameters of the several groups of annular structures gradually decrease from top to bottom. The inner part of the connecting water jacket 19 is provided with a docking collar 21 for cooperating with the sealing cone 20. With the arrangement of the conical sealing cone 20, when the connecting water jacket 19 performs a quick connection operation on the heat exchange tube 15, the docking resistance can be reduced. At the same time, when the sealing cone 20 and the docking collar 21 are docked, the arrangement of the several groups of annular structures can increase the contact surface between the sealing cone 20 and the docking collar 21, improving the airtightness while ensuring the quick connection effect between the sealing cone 20 and the docking collar 21.

[0043] Flow guide pipes 26 are fixedly installed on the outer surfaces of both ends of the connector 14. Sealing cones 20 are fixedly sleeved on the ends of the flow guide pipes 26 and the heat exchange tubes 15. The coolant is introduced into the cooling jacket 12 through the liquid inlet pipe 11, so that the coolant circulates between several groups of cooling jackets 12 and is discharged outward through the drain pipe 10. With the arrangement of the sealing cone 20 and the cooperation with the docking collar 21, a quick installation structure is formed between the two groups of cooling jackets 12, facilitating the rapid assembly of several groups of cooling jackets 12. During operation, the connector 14 is placed between the two groups of cooling jackets 12. By pressing the two groups of cooling jackets 12, the sealing cone 20 cooperates with the docking collar 21 to complete the quick docking between the two groups of cooling jackets 12, facilitating the S-shaped series installation between several groups of two cooling jackets 12.

[0044] To solve the problem of poor stability of its combined structure, as Figure 7 shown, several groups of fixing strips 27 for cooperating with the cooling jacket 12 are fixedly installed inside the limit card frame 7. A splicing frame 13 is installed on the upper part of the fixing strip 27. The cooling jacket 12 is fixed between the fixing strip 27 and the splicing frame 13. Since several groups of cooling jackets 12 are quickly installed using the connector 14, to prevent the assembled cooling jackets 12 from falling off, by adding the fixing strip 27 and the splicing frame 13, the fixing strip 27 and the splicing frame 13 are clamped on the outer surfaces of several groups of cooling jackets 12, playing a role in limiting and fixing the installation of several groups of cooling jackets 12.

[0045] Semicircular card slots for cooperating with the cooling jacket 12 are provided on the surfaces of the fixing strip 27 and the splicing frame 13. The fixing strip 27 and the splicing frame 13 are fixed by bolts. The user clamps the cooling jacket 12 in the semicircular card slots of the fixing strip 27 and the splicing frame 13, and uses bolts to lock the fixing strip 27 and the splicing frame 13 to complete the installation and fixation of the cooling jacket 12.

[0046] A number of limit seat holders 28 for cooperating with the water jacket 19 are fixedly installed inside the limit clamping frame 7. A docking groove 22 is provided on the side of the connecting water jacket 19. Since a number of heat exchange tubes 15 are quickly installed by using the connecting water jacket 19, in order to solve the problem of looseness between the heat exchange tube 15 and the connecting water jacket 19, by adding the limit seat holder 28, the installed connecting water jacket 19 is limited and fixed by the limit seat holder 28 to prevent the heat exchange tube 15 and the connecting water jacket 19 from loosening and falling off. At the same time, the fixing strip 27, the splicing frame 13 and the limit seat holder 28 are loaded inside the limit clamping frame 7, so that when the cooling member 6 is assembled, the reinforcement operations for both the cooling jacket 12 and the heat exchange tube 15 can be satisfied simultaneously.

[0047] The upper part of the compressor 2 is fixedly installed with a compression chamber 3. An air inlet pipe 8 is provided at one end of the compression chamber 3. The other end of the compression chamber 3 and the cooling member 6 are connected through a communicating pipe 9. A number of limit clamping frames 7 are butt-jointed and fixed through a fixed housing 5. One end of the compressor 2 is installed with a motor 4. Nitrogen is injected into the interior of the compression chamber 3 through the air inlet pipe 8. The compressor 2 is used to pressurize the nitrogen. The temperature of the pressurized nitrogen rises. To prevent it from reacting with the crude oil, it is necessary to cool it down. The pressurized nitrogen is introduced into the interior of the cooling member 6 through the communicating pipe 9 for cooling operation. The nitrogen source is injected into the oil field or oil well, and the oil is extracted by relying on the gas pressure.

[0048] During use, in order to inject the nitrogen source into the oil field or oil well, generally the compressor 2 is used to pressurize the nitrogen. The temperature of the pressurized nitrogen rises, and directly injecting it into the oil field will cause a high-temperature reaction with the crude oil. Therefore, it is necessary to cool the pressurized nitrogen. The traditional cooling structure is integrally arranged and fixed by a welding structure, making the entire cooler unable to disassemble and clean the heat exchange tube 15 and the casing, and it is easy to have a blockage phenomenon during long-term use, affecting its long-term use effect. Secondly, the traditional combined structure generally uses a threaded structure for fixing, increasing the operation difficulty when assembling and installing the heat exchange tube 15 and the casing, and unable to complete the disassembly and installation between a number of heat exchange tubes 15 and between a number of casings. Secondly, although the quick-disassembly installation structure is convenient for installation, its stability is poor, and under the action of external force, it is easy for a number of heat exchange tubes 15 and a number of casings to fall off.

[0049] Therefore, by providing a flange ring 16 and a flange plate 17, when the nitrogen flooding compression system for oil field exploitation is used, it has a combined cooling installation structure, enabling the heat exchange tube 15 and the casing to be disassembled and assembled, replacing the traditional welding fixing method, and at the same time ensuring its sealing performance.

[0050] During operation, when fixing between the heat exchange tube 15 and the cooling jacket 12, by using the sealing plug 18 to dock with the sealing sleeve 25, the airtightness between the ends of the heat exchange tube 15 and the cooling jacket 12 can be effectively improved. During operation, first, the sealing sleeves 25 are respectively sleeved on the inner sides of both ends of the cooling jacket 12, then the heat exchange tube 15 is inserted into the middle of the cooling jacket 12, the sealing plug 18 is sleeved on the outer surface of the heat exchange tube 15, and by pushing the sealing plug 18, the sealing plug 18 is inserted into the docking groove 22 of the sealing sleeve 25. At the same time, both the fixing collar 24 of the sealing plug 18 and the sealing sleeve 25 are placed between the flange 17 and the flange ring 16. After the flange 17 and the flange ring 16 are fixed, the fixing collar 24 is squeezed to complete the sealing operation of the heat exchange tube 15 and the cooling jacket 12. After the flange 17 and the flange ring 16 are fixed, the fixing collar 24 is squeezed to improve its sealing effect. Secondly, for the sealing plug 18 with a frustum shape, when the sealing plug 18 is inserted into the inside of the docking groove 22, the sealing plug 18 squeezes the sealing sleeve 25, making the sealing sleeve 25 in close contact with the inside of the cooling jacket 12. The sealing plug 18 and the sealing sleeve 25 form an inserted sealing structure, which can effectively increase its sealing contact surface compared with the traditional sealing ring and avoid leakage. Secondly, the flange ring 16 and the flange 17 are fixed by bolts, so that the assembly and fixation between the heat exchange tube 15 and the cooling jacket 12 are completed. After long-term use, the heat exchange tube 15 can be pulled out from the cooling jacket 12, and the inside of the cooling jacket 12 can be flushed and cleaned to keep it in a good unobstructed state.

[0051] By setting the connector 14 and the connecting water jacket 19, when the nitrogen gas flooding compression system for oilfield exploitation is in use, the use of its combined cooling structure is optimized to make it have a quick-disassembly installation structure;

[0052] During use, first, when docking between the sealing cone 20 and the heat exchange tube 15, raw tape can be wound around the surface of the heat exchange tube 15 to improve the airtightness between the sealing cone 20 and the heat exchange tube 15. The setting of the connecting water jacket 19 enables quick-disassembly installation operations between two groups of heat exchange tubes 15. By pressing the connecting water jacket 19, the docking sleeves 21 of the connecting water jacket 19 are simultaneously docked with the sealing cones 20 of two heat exchange tubes 15, so that the two heat exchange tubes 15 are connected and fixed. The setting of multiple connecting water jackets 19 enables several groups of heat exchange tubes 15 to form an S-shaped waterway structure. With the setting of the conical sealing cone 20, when the connecting water jacket 19 performs a quick connection operation on the heat exchange tube 15, the docking resistance can be reduced. At the same time, after the sealing cone 20 and the docking sleeve 21 are docked, the setting of several groups of ring structures can increase the contact surface between the sealing cone 20 and the docking sleeve 21, improving its airtightness while ensuring the quick connection effect of the sealing cone 20 and the docking sleeve 21;

[0053] Secondly, by using the setting of the sealing cone 20 and cooperating with the use of the docking ferrule 21, a quick installation structure is formed between the two cooling sleeves 12, which facilitates the rapid assembly of several groups of cooling sleeves 12. During operation, the connector 14 is placed between the two cooling sleeves 12. By pressing the two cooling sleeves 12 and using the sealing cone 20 to cooperate with the docking ferrule 21, the two cooling sleeves 12 are quickly docked, which is convenient for the S-shaped series installation between several groups of two cooling sleeves 12.

[0054] By setting the limit card frame 7, in the nitrogen flooding compression system for oilfield exploitation, the use of the quick-disassembly installation structure of the connector 14 and the connecting water jacket 19 is optimized, and its structural stability is improved.

[0055] During operation, since the connector 14 is used for quick installation between several groups of cooling sleeves 12, in order to prevent the assembled cooling sleeves 12 from falling off, by installing the fixing strip 27 and the splicing frame 13, the fixing strip 27 and the splicing frame 13 are clamped on the outer surfaces of several groups of cooling sleeves 12, playing a role in limiting and fixing the installation of several groups of cooling sleeves 12. Since the connecting water jacket 19 is used for quick installation between several groups of heat exchange tubes 15, in order to solve the loosening problem between the heat exchange tubes 15 and the connecting water jacket 19, by installing the limit seat 28, the installed connecting water jacket 19 is limited and fixed by the limit seat 28 to prevent the heat exchange tubes 15 and the connecting water jacket 19 from loosening and falling off. And the fixing strip 27, the splicing frame 13 and the limit seat 28 are all loaded in the limit card frame 7, so that when the cooling member 6 is assembled, the reinforcement operations for both the cooling sleeves 12 and the heat exchange tubes 15 are satisfied at the same time.

[0056] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A nitrogen flooding compression system for oilfield exploitation, characterized in that, It includes a fixed base (1), a compressor (2) and a cooling member (6). The compressor (2) is fixedly installed at the upper end of the fixed base (1), and the cooling member (6) is fixedly installed above the compressor (2). The cooling member (6) includes a limit card frame (7) and several groups of cooling sleeves (12). A heat exchange tube (15) is spliced and installed at the middle position inside the cooling sleeve (12). Flange plates (17) are provided at both ends of the heat exchange tube (15). Flange rings (16) are fixedly installed at both ends of the cooling sleeve (12). The heat exchange tube (15) and the cooling sleeve (12) are butt-joined and fixed through the flange plate (17) and the flange ring (16). Several groups of cooling sleeves (12) are connected through a connector (14). Several groups of heat exchange tubes (15) are connected through a connecting water jacket (19) by pipelines. Several groups of cooling sleeves (12) are all spliced and installed inside the limit card frame (7).

2. The nitrogen gas flooding compression system for oilfield exploitation according to claim 1, wherein Sealing plugs (18) are sleeved on the outer surfaces of both ends of the heat exchange tube (15). Sealing sleeves (25) for cooperating with the sealing plugs (18) are provided on the inner sides of both ends of the cooling sleeve (12). A fixed collar (24) is provided at one end of the sealing sleeve (25).

3. The nitrogen gas flooding compression system for oilfield exploitation according to claim 2, characterized in that, The overall shape of the sealing plug (18) is a frustum structure, and a docking groove (22) for cooperating with the sealing plug (18) is provided on the inner side of the sealing sleeve (25). Fixed collars (24) are provided at the ends of both the sealing plug (18) and the sealing sleeve (25). An airtight ring (23) is provided on the outer side of the sealing sleeve (25).

4. A nitrogen flooding compression system for oilfield exploitation according to claim 1, characterized in that, A communication groove is provided inside the connecting water jacket (19). A sealing cone (20) for cooperating with the connecting water jacket (19) is fixedly installed at the end of the heat exchange tube (15). The sealing cone (20) and the heat exchange tube (15) are fixed by threads.

5. The nitrogen flooding compression system for oilfield exploitation according to claim 4, characterized in that, Several groups of annular structures are provided on the outer surface of the sealing cone (20), and the diameters of several groups of annular structures decrease step by step from top to bottom. A docking card sleeve (21) for cooperating with the sealing cone (20) is provided inside the connecting water jacket (19).

6. The nitrogen flooding compression system for oilfield exploitation according to claim 1, wherein, Flow guide pipes (26) are fixedly installed on the outer surfaces of both ends of the connector (14). Sealing cones (20) are fixedly sleeved at the ends of both the flow guide pipe (26) and the heat exchange tube (15).

7. A nitrogen flooding compression system for oilfield exploitation according to claim 1, characterized in that Several groups of fixed card strips (27) for cooperating with the cooling sleeves (12) are fixedly installed inside the limit card frame (7). A splicing frame (13) is installed on the upper part of the fixed card strip (27). The cooling sleeve (12) is fixed between the fixed card strip (27) and the splicing frame (13).

8. A nitrogen flooding compression system for oilfield exploitation according to claim 7, characterized in that, Semicircular card slots for cooperating with the cooling sleeves (12) are provided on the surfaces of both the fixed card strip (27) and the splicing frame (13). The fixed card strip (27) and the splicing frame (13) are fixed by bolts.

9. A nitrogen flooding compression system for oilfield exploitation according to claim 1, characterized in that, Several groups of limit card seats (28) for cooperating with the connecting water jacket (19) are fixedly installed on the inner side of the limit card frame (7). A docking groove (22) is provided on the side of the connecting water jacket (19).

10. A nitrogen gas flooding compression system for oilfield exploitation according to claim 1, characterized in that, The upper part of the compressor (2) is fixedly installed with a compression chamber (3), and an air inlet pipe (8) is arranged at one end of the compression chamber (3). The other end of the compression chamber (3) is connected to a cooling member (6) through a connecting pipe (9). A plurality of groups of limit card frames (7) are butt-jointed and fixed through a fixed housing (5), and a motor (4) is installed at one end of the compressor (2).

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