A gas recovery device for comprehensive treatment of oilfield associated gas

Abstract

The application discloses a gas recovery device for comprehensive treatment of oilfield associated gas, and belongs to the field of gas recovery devices, which comprises: a first dehydration tank for dehydrating oilfield associated gas; an adjustable desulfurization mechanism for desulfurizing the dehydrated oilfield associated gas in an adjustable mode; a dehydrocarbon mechanism for dehydrocarbonizing the desulfurized oilfield associated gas to form purified natural gas; a compression mechanism for compressing and cooling the natural gas and then conveying the natural gas to an external recovery pipe network through a pipeline; and a blowdown mechanism for discharging sewage formed by the first dehydration tank and sewage formed by the dehydrocarbon mechanism. The application can flexibly adjust the desulfurization mode according to needs, uses two desulfurization towers in parallel to speed up the desulfurization speed when the gas flow is large, thereby timely processing the large-flow gas and avoiding damage caused by sudden pressure increase, and uses the two desulfurization towers in series to improve the desulfurization effect when the gas flow is small.

Description

Technical Field

[0001] This invention relates to a gas recovery device, specifically a gas recovery device for the comprehensive treatment of associated gas in oil fields. Background Technology

[0002] A large amount of associated gas is generated during oil exploration and extraction. However, associated gas contains more impurities such as hydrogen sulfide than natural gas and cannot be used directly. Furthermore, due to its small quantity and dispersed nature, it is not conducive to continuous use. If it is not recovered, it will result in a large amount of energy waste. Therefore, associated gas recovery devices are often built at exploration sites.

[0003] However, existing gas recovery devices typically employ two desulfurization towers connected in series for deep desulfurization. While this method offers good desulfurization efficiency, it struggles to handle large gas flows in a timely manner, leading to sudden pressure increases and potential damage. A key challenge in desulfurization is how to flexibly switch and adjust the pressure as needed. Therefore, those skilled in the art have developed a gas recovery device for the comprehensive treatment of associated gas in oil fields to address the problems mentioned in the background section. Summary of the Invention

[0004] The purpose of this invention is to provide a gas recovery device for the comprehensive treatment of associated gas in oil fields, which can flexibly adjust the desulfurization method as needed. When the gas flow rate is large, two desulfurization towers are used in parallel; when the gas flow rate is small, two desulfurization towers are used in series, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A gas recovery device for integrated treatment of associated gas in oil fields, comprising:

[0007] The first dehydration tank is connected to the tank storing associated gas from the oilfield and is used to dehydrate the associated gas from the oilfield.

[0008] An adjustable desulfurization mechanism is connected to the first dehydration tank to perform adjustable desulfurization on the dehydrated associated gas from the oilfield.

[0009] The dehydrocarbon removal mechanism, connected to the adjustable desulfurization mechanism, is used to remove hydrocarbons from the associated gas from the oilfield after desulfurization, thereby removing hydrocarbon substances to form purified natural gas.

[0010] The compression mechanism, connected to the dehydrogenation mechanism, is used to compress and cool natural gas before transporting it through pipelines to an external recovery network;

[0011] The solenoid valve is installed between the external recovery pipeline and the tank. It is used to open when the pressure inside the tank drops to a threshold, so that the natural gas can be returned to the tank.

[0012] The sewage discharge mechanism is connected to the first dehydration tank and the dehydrogenation mechanism, and is used to discharge the sewage generated by the first dehydration tank and the sewage generated by the dehydrogenation mechanism.

[0013] As a further aspect of the present invention: the adjustable desulfurization mechanism specifically includes: a first desulfurization tower and a second desulfurization tower, wherein an adjustment pipe is provided between the first desulfurization tower and the second desulfurization tower, and an adjustable valve is provided on the adjustment pipe to control the first desulfurization tower and the second desulfurization tower to be connected in parallel or in series, and the first desulfurization tower and the second desulfurization tower are used to desulfurize associated gas from the oilfield.

[0014] As a further aspect of the present invention: the adjustable valve component specifically includes: valve one, valve two, valve three, valve four, valve five, and valve six. When the first desulfurization tower and the second desulfurization tower are connected in parallel, valves one, two, five, and six are open, and valves three and four are closed; when the first desulfurization tower and the second desulfurization tower are connected in series, valves one, three, and six are open, and valves two, four, and five are closed, or valves one, three, and six are closed, and valves two, four, and five are open.

[0015] As a further aspect of the present invention: the dehydrocarbonization mechanism specifically includes:

[0016] The cooling component, connected to the adjustable desulfurization mechanism, is used to cool the associated gas from the oilfield after desulfurization, forming water and liquid hydrocarbons during the cooling process;

[0017] The second dehydration tank is connected to the cooling assembly and is used to dehydrate the cooled associated gas from the oilfield to remove the natural gas. The bottom of the second dehydration tank is connected to the sewage discharge mechanism for discharging wastewater.

[0018] The filter, connected to the second dehydration tank, is used to filter natural gas to form purified natural gas.

[0019] As a further embodiment of the present invention: the cooling assembly specifically includes: an evaporator, a cooler, and a refrigeration unit. The evaporator is connected to an adjustable desulfurization mechanism for cooling the desulfurized associated gas from the oilfield and conveying the cooled associated gas to a second dehydration tank. The refrigeration unit is connected to the evaporator for recirculating the refrigerant that has absorbed heat in the evaporator back to the cooler. The cooler is connected to the refrigeration unit for cooling the recirculated refrigerant with heat and conveying the cooled refrigerant back to the evaporator for further cooling of the associated gas from the oilfield. An expansion valve is connected between the evaporator and the cooler for throttling and reducing the pressure of the refrigerant output from the cooler.

[0020] As a further embodiment of the present invention: the compression mechanism specifically includes: an oil-gas separator, a screw compressor, a cooling system, and a motor. The oil-gas separator is connected to a filter for receiving natural gas. The screw compressor is located inside the oil-gas separator for pressurizing the incoming natural gas. The output end of the motor is connected to the screw compressor for driving the screw compressor to operate. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated during the operation of the screw compressor.

[0021] As a further embodiment of the present invention: the cooling system specifically includes: a radiator and an axial fan, the radiator being connected to an oil-gas separator to absorb heat from natural gas and lubricating oil, and the axial fan being located on one side of the radiator to blow away the heat absorbed by the radiator to achieve cooling.

[0022] As a further aspect of the present invention: the sewage discharge mechanism specifically includes:

[0023] The first sewage pipe network is connected to the first dewatering tank and is used to discharge the sewage generated by the first dewatering tank into the external sewage pipe network;

[0024] The second sewage network is connected to the dehydrogenation unit and is used to discharge the wastewater generated by the dehydrogenation unit into the external sewage network.

[0025] As a further embodiment of the present invention: the first sewage discharge network specifically includes: a first sewage discharge shut-off valve and a first electric valve. The bottom output end of the first dehydration tank is connected to the first sewage discharge shut-off valve and the first electric valve. The first sewage discharge shut-off valve is used for manual sewage discharge, and the first electric valve is used for automatic sewage discharge. The first electric valve is sequentially connected to a motor compressor and a first check valve. The output end of the first check valve is connected to an external sewage network. The two ends of the first electric valve are connected in parallel to a second sewage discharge shut-off valve, and the two ends of the motor compressor are connected in parallel to a third sewage discharge shut-off valve.

[0026] As a further embodiment of the present invention: the second sewage pipe network specifically includes: a fourth sewage shut-off valve and a second electric valve. The dehydrogenation mechanism is connected to the fourth sewage shut-off valve and the second electric valve. The fourth sewage shut-off valve is used for manual sewage discharge, and the second electric valve is used for automatic sewage discharge. The second electric valve is connected to a second check valve. The second check valve is connected to a motor compressor. A fifth sewage shut-off valve is connected in parallel to both ends of the second electric valve.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This application can flexibly adjust the desulfurization method as needed. When the gas flow rate is large, the two desulfurization towers can be used in parallel to accelerate the desulfurization speed, thereby processing the large flow of gas in time and avoiding damage caused by sudden pressure increase. When the gas flow rate is small, the two desulfurization towers can be used in series to improve the desulfurization effect. The two methods can be flexibly switched and have high applicability.

[0029] 2. In the two dehydration stages, the wastewater generated by this application can be effectively managed. Under normal circumstances, it is automatically discharged into the external sewage network and the pressure of the sewage discharge pipe can be adaptively adjusted. In case of failure, it can also be manually discharged in a timely manner. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a gas recovery device for the comprehensive treatment of associated gas in oil fields;

[0031] Figure 2 This is a schematic diagram of an adjustable desulfurization mechanism in a gas recovery device for comprehensive treatment of associated gas in oil fields.

[0032] Figure 3 This is a schematic diagram of the cooling component in a gas recovery device for integrated treatment of associated gas in oil fields;

[0033] Figure 4 This is a schematic diagram of the compression mechanism in a gas recovery device for integrated treatment of associated gas in oil fields;

[0034] Figure 5 This is a schematic diagram of the first sewage pipe network in a gas recovery device for comprehensive treatment of associated gas in oil fields;

[0035] Figure 6 This is a schematic diagram of the second sewage pipe network in a gas recovery device for the comprehensive treatment of associated gas in oil fields.

[0036] In the diagram: 1. First dehydration tank; 2. Cooling assembly; 201. Evaporator; 202. Refrigeration unit; 203. Cooler; 204. Expansion valve; 3. Second dehydration tank; 4. Filter; 5. Compression mechanism; 501. Oil-gas separator; 502. Screw compressor; 503. Motor; 504. Radiator; 505. Axial fan; 6. First sewage pipe network; 601. First sewage shut-off valve; 602. First electric valve; 603. Motor compressor; 604. First check valve; 605. Second sewage shut-off valve; 606. 7. Second sewage discharge shut-off valve; 701. Fourth sewage discharge shut-off valve; 702. Second electric valve; 703. Second check valve; 704. Fifth sewage discharge shut-off valve; 8. Adjustable desulfurization mechanism; 801. First desulfurization tower; 802. Second desulfurization tower; 803. Valve 1; 804. Valve 2; 805. Valve 3; 806. Valve 4; 807. Valve 5; 808. Valve 6; 9. Gas shut-off valve; 10. Third check valve; 11. Pressure measuring instrument; 12. Safety valve; 13. Flame arrester; 14. Solenoid valve. Detailed Implementation

[0037] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0038] Please see Figures 1-6 In this embodiment of the invention, a gas recovery device for comprehensive treatment of associated gas in oil fields includes:

[0039] The first dehydration tank 1 is connected to the tank for storing associated gas from the oil field, and is used to dehydrate the associated gas from the oil field;

[0040] An adjustable desulfurization mechanism 8 is connected to the first dehydration tank 1 to perform adjustable desulfurization on the dehydrated associated gas from the oilfield.

[0041] The dehydrocarbon removal mechanism, connected to the adjustable desulfurization mechanism 8, is used to remove hydrocarbons from the associated gas from the oilfield after desulfurization, thereby removing hydrocarbon substances to form purified natural gas.

[0042] Compression mechanism 5, connected to dehydrocarbonization mechanism, is used to compress and cool natural gas before transporting it through pipelines to the external recovery network;

[0043] Solenoid valve 14 is installed between the external recovery pipeline and the tank, and is used to open when the pressure inside the tank drops to a threshold, so as to return natural gas to the tank.

[0044] The sewage discharge mechanism is connected to the first dehydration tank 1 and the dehydrogenation mechanism, and is used to discharge the sewage generated by the first dehydration tank 1 and the sewage generated by the dehydrogenation mechanism.

[0045] This application allows for flexible adjustment of the desulfurization method as needed. When the gas flow rate is large, the two desulfurization towers can be used in parallel; when the gas flow rate is small, the two desulfurization towers can be used in series.

[0046] In this embodiment: the adjustable desulfurization mechanism 8 specifically includes: a first desulfurization tower 801 and a second desulfurization tower 802. An adjustment pipe is provided between the first desulfurization tower 801 and the second desulfurization tower 802, and an adjustable valve is provided on the adjustment pipe to control the first desulfurization tower 801 and the second desulfurization tower 802 to be connected in parallel or in series. The first desulfurization tower 801 and the second desulfurization tower 802 are used to desulfurize associated gas from the oilfield.

[0047] In this embodiment, the adjustable valve components specifically include: valve 1 (803), valve 2 (804), valve 3 (805), valve 4 (806), valve 5 (807), and valve 6 (808). When the first desulfurization tower 801 and the second desulfurization tower 802 are connected in parallel, valves 1 (803), 2 (804), 5 (807), and 6 (808) are open, while valves 3 (805) and 4 (806) are closed. When the first desulfurization tower 801 and the second desulfurization tower 802 are connected in series, valves 1 (803), 3 (805), and 6 (808) are open, while valves 2 (804), 4 (806), and 5 (807) are closed. Alternatively, valves 1 (803), 3 (805), and 6 (808) are closed, while valves 2 (804), 4 (806), and 5 (807) are open.

[0048] In this embodiment: the dehydrocarbonization mechanism specifically includes:

[0049] Cooling component 2, connected to adjustable desulfurization mechanism 8, is used to cool the associated gas from the oilfield after desulfurization, and water and liquid hydrocarbons are formed during the cooling process;

[0050] The second dehydration tank 3 is connected to the cooling component 2 and is used to dehydrate the cooled associated gas from the oilfield to remove the natural gas. The bottom of the second dehydration tank 3 is connected to the sewage discharge mechanism for discharging wastewater.

[0051] Filter 4, connected to the second dehydration tank 3, is used to filter natural gas to form purified natural gas.

[0052] In this embodiment, the cooling component 2 specifically includes an evaporator 201, a cooler 203, and a refrigeration unit 202. The evaporator 201 is connected to an adjustable desulfurization mechanism 8 and is used to cool the desulfurized associated gas from the oilfield and to deliver the cooled associated gas to the second dehydration tank 3. The refrigeration unit 202 is connected to the evaporator 201 and is used to return the refrigerant that has absorbed heat in the evaporator 201 to the cooler 203. The cooler 203 is connected to the refrigeration unit 202 and is used to cool the returned refrigerant with heat and to deliver the cooled refrigerant to the evaporator 201 to continue cooling the associated gas from the oilfield. An expansion valve 204 is connected between the evaporator 201 and the cooler 203 to throttle and reduce the pressure of the refrigerant output from the cooler 203.

[0053] In this embodiment, the compression mechanism 5 specifically includes: an oil-gas separator 501, a screw compressor 502, a cooling system, and a motor 503. The oil-gas separator 501 is connected to the filter 4 and is used to receive natural gas. The screw compressor 502 is located inside the oil-gas separator 501 and is used to pressurize the incoming natural gas. The output end of the motor 503 is connected to the screw compressor 502 for driving the screw compressor 502 to operate. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated by the operation of the screw compressor 502.

[0054] In this embodiment, the cooling system specifically includes a radiator 504 and an axial fan 505. The radiator 504 is connected to an oil-gas separator 501 to absorb heat from natural gas and lubricating oil. The axial fan 505 is located on one side of the radiator 504 and is used to blow away the heat absorbed by the radiator 504 to achieve cooling.

[0055] In this embodiment, a minimum pressure valve is provided between the top of the radiator 504 and the top of the oil-gas separator 501 to serve as a buffer.

[0056] In this embodiment, an oil filter 4 is provided between the bottom of the radiator 504 and the bottom of the oil-gas separator 501, which serves as a filter medium.

[0057] In this embodiment, a temperature control valve is provided between the oil filter 4 and the top of the oil-gas separator 501 to balance the pipeline pressure.

[0058] In this embodiment: the sewage discharge mechanism specifically includes:

[0059] The first sewage pipe network 6 is connected to the first dehydration tank 1 and is used to discharge the sewage generated by the first dehydration tank 1 into the external sewage pipe network;

[0060] The second sewage pipe network 7 is connected to the dehydrogenation unit and is used to discharge the sewage generated by the dehydrogenation unit into the external sewage pipe network.

[0061] In this embodiment: the first sewage pipe network 6 specifically includes: a first sewage shut-off valve 601 and a first electric valve 602. The bottom output end of the first dehydration tank 1 is connected to the first sewage shut-off valve 601 and the first electric valve 602. The first sewage shut-off valve 601 is used for manual sewage discharge, and the first electric valve 602 is used for automatic sewage discharge. The first electric valve 602 is sequentially connected to a motor compressor 603 and a first check valve 604. The output end of the first check valve 604 is connected to the external sewage pipe network. The two ends of the first electric valve 602 are connected in parallel to a second sewage shut-off valve 605, and the two ends of the motor compressor 603 are connected in parallel to a third sewage shut-off valve 606. The first sewage discharge network 6 has two treatment methods for the sewage discharged from the first dehydration tank 1. One is the automatic sewage discharge method. In this method, the sewage flows through the first electric valve 602, is compressed by the motor compressor 603, and is discharged into the external sewage network through the first one-way valve 604. In addition, when the first electric valve 602 is under too much pressure, the second sewage shut-off valve 605 can be opened to reduce the pressure through dual-channel sewage discharge. When the motor compressor 603 is under too much pressure, the third sewage shut-off valve 606 can be opened to relieve the pressure. The other is the manual sewage discharge method, which is to open the first sewage shut-off valve 601 to directly discharge the sewage. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0062] In this embodiment: gate valves are connected to both ends of the first electric valve 602, which can effectively balance the input and output pressure of the first electric valve 602, and a shut-off valve is connected between the output end of the first electric valve 602 and the corresponding gate valve, which can release pressure when the pressure is too high.

[0063] In this embodiment, shut-off valves are connected to both ends of the motor compressor 603 to control the amount of sewage compressed at both ends of the motor compressor 603, thereby preventing the motor compressor 603 from being damaged due to excessive load.

[0064] In this embodiment: the second sewage pipeline network 7 specifically includes: a fourth sewage shut-off valve 701 and a second electric valve 702. The dehydrocarbonization mechanism is connected to the fourth sewage shut-off valve 701 and the second electric valve 702. The fourth sewage shut-off valve 701 is used for manual sewage discharge, and the second electric valve 702 is used for automatic sewage discharge. The second electric valve 702 is connected to a second check valve 703. The second check valve 703 is connected to the motor compressor 603. A fifth sewage shut-off valve 704 is connected in parallel to both ends of the second electric valve 702. The second sewage discharge network 7 has two treatment methods for the sewage discharged from the second dewatering tank 3. One is the automatic sewage discharge method. In this method, the sewage flows through the second electric valve 702 and is discharged into the motor compressor 603 through the second one-way valve 703. After being compressed by the motor compressor 603, it is discharged into the external sewage network through the first one-way valve 604. In addition, when the pressure on the second electric valve 702 is too high, the fifth sewage discharge shut-off valve 704 can be opened to reduce the pressure through dual-channel sewage discharge. The other is the manual sewage discharge method, which is to open the fourth sewage discharge shut-off valve 701 to directly discharge the sewage. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0065] In this embodiment: gate valves are connected to both ends of the second electric valve 702, which can effectively balance the input and output pressure of the second electric valve 702, and a shut-off valve is connected between the output end of the second electric valve 702 and the corresponding gate valve, which can release pressure when the pressure is too high.

[0066] In this embodiment, a flame arrester 13 is provided on the pipe connecting the tank body and the first dehydration tank 1 to prevent the spread of flames.

[0067] In this embodiment, a gas shut-off valve 9 is connected between the flame arrester 13 and the first dehydration tank 1 to control the flow of flammable gas between the flammable gas and the first dehydration tank 1.

[0068] In this embodiment, a third check valve 10 is provided on the pipeline connecting the compression mechanism 5 to the external recovery pipeline network to prevent crude oil backflow.

[0069] In this embodiment: a safety valve 12 is fixedly connected to the top of the first dehydration tank 1, and a pressure measuring instrument 11 communicating with the interior of the first dehydration tank 1 is connected to the outside of the first dehydration tank 1.

[0070] In this embodiment, the gas recovery device for comprehensive treatment of associated gas in oil fields also includes a controller for controlling the operating status of the entire gas recovery device.

[0071] The working principle of this invention is as follows: During use, associated gas from the oilfield is transported to the first dehydration tank 1 for dehydration. The dehydrated associated gas then enters the adjustable desulfurization mechanism 8 for desulfurization. During the desulfurization process, a suitable desulfurization method is selected according to the flow rate of the associated gas. When the flow rate is large, the first desulfurization tower 801 and the second desulfurization tower 802 are connected in parallel through adjustable valves. Specifically, valves 803, 804, 807, and 808 are opened, while valves 805 and 806 are closed. At this time, the first desulfurization tower 801 and the second desulfurization tower... Simultaneously, desulfurization is carried out in tower 802 to accelerate the desulfurization process. When the flow rate is low, the first desulfurization tower 801 and the second desulfurization tower 802 are connected in parallel via adjustable valves. Specifically, valves 803, 805, and 808 are open, while valves 804, 806, and 807 are closed; or, valves 803, 805, and 808 are closed, while valves 804, 806, and 807 are open. In this case, the associated gas from the oilfield needs to enter the two desulfurization towers sequentially for two desulfurization processes to improve the desulfurization effect. Subsequently, the desulfurized associated gas from the oilfield is transported to the hydrocarbon removal mechanism for hydrocarbon removal, removing hydrocarbons to form purified natural gas. The natural gas is then transported to the compression mechanism 5, which compresses and cools the natural gas to form liquefied natural gas. The liquefied natural gas is then transported through pipelines to the external recovery network. In addition, the gas recovery device used for the comprehensive treatment of associated gas in oil fields operates when the internal pressure of the tank reaches the threshold (1700pa), extracting and recovering flammable gas to effectively prevent damage caused by excessive tank pressure; when the internal pressure of the tank is detected to drop to the threshold (300pa), the solenoid valve 14 opens to return the natural gas that was originally delivered to the external recovery pipeline to the tank, preventing damage caused by negative pressure in the tank.

[0072] It should be noted that during the associated gas recovery process in the oilfield, a large amount of wastewater is generated due to dehydration. The first sewage discharge network 6 has two treatment methods for the wastewater (including liquid hydrocarbons) discharged from the first dehydration tank 1. One is the automatic sewage discharge method. In this method, the wastewater flows through the first electric valve 602, is compressed by the motor compressor 603, and is discharged into the external sewage network through the first one-way valve 604. In addition, when the first electric valve 602 is under too much pressure, the second sewage shut-off valve 605 can be opened to reduce the pressure through dual-channel sewage discharge. When the motor compressor 603 is under too much pressure, the third sewage shut-off valve 606 can be opened to relieve the pressure. The other is the manual sewage discharge method, which is to open the first sewage shut-off valve 601 to directly discharge the wastewater. This sewage discharge method is suitable for use when the automatic sewage discharge method fails. Similarly, the second sewage network 7 also has two treatment methods for the sewage (i.e., water and liquid hydrocarbons) discharged from the second dehydration tank 3. One is the automatic sewage discharge method, in which the sewage flows through the second electric valve 702, is discharged into the motor compressor 603 through the second one-way valve 703, and after being compressed by the motor compressor 603, is discharged into the external sewage network through the first one-way valve 604. In addition, when the pressure on the second electric valve 702 is too high, the fifth sewage shut-off valve 704 can be opened to reduce the pressure through dual-channel sewage discharge. The other is the manual sewage discharge method, that is, the fourth sewage shut-off valve 701 is opened to directly discharge the sewage. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0073] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0074] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas recovery device for comprehensive treatment of associated gas in oil fields, characterized in that, include: The first dehydration tank is connected to the tank storing associated gas from the oilfield and is used to dehydrate the associated gas from the oilfield. An adjustable desulfurization mechanism is connected to the first dehydration tank to perform adjustable desulfurization on the dehydrated associated gas from the oilfield. The dehydrocarbon removal mechanism, connected to the adjustable desulfurization mechanism, is used to remove hydrocarbons from the associated gas from the oilfield after desulfurization, thereby removing hydrocarbon substances to form purified natural gas. The compression mechanism, connected to the dehydrogenation mechanism, is used to compress and cool natural gas before transporting it through pipelines to an external recovery network; The solenoid valve is installed between the external recovery pipeline and the tank. It is used to open when the pressure inside the tank drops to a threshold, so that the natural gas can be returned to the tank. The sewage discharge mechanism is connected to the first dehydration tank and the dehydrocarbon removal mechanism, and is used to discharge the sewage generated by the first dehydration tank and the sewage generated by the dehydrocarbon removal mechanism. The adjustable desulfurization mechanism specifically includes: a first desulfurization tower and a second desulfurization tower, with an adjustment pipe between the first desulfurization tower and the second desulfurization tower, and an adjustable valve on the adjustment pipe for controlling the first desulfurization tower and the second desulfurization tower to be connected in parallel or in series, and the first desulfurization tower and the second desulfurization tower are used to desulfurize associated gas from the oilfield. The dehydrocarbon removal mechanism specifically includes: The cooling component, connected to the adjustable desulfurization mechanism, is used to cool the associated gas from the oilfield after desulfurization, forming water and liquid hydrocarbons during the cooling process; The second dehydration tank is connected to the cooling assembly and is used to dehydrate the cooled associated gas from the oilfield to remove the natural gas. The bottom of the second dehydration tank is connected to the sewage discharge mechanism for discharging wastewater. A filter, connected to a second dehydration tank, is used to filter natural gas to produce purified natural gas; The compression mechanism specifically includes: an oil-gas separator, a screw compressor, a cooling system, and a motor. The oil-gas separator is connected to a filter and is used to receive natural gas. The screw compressor is located inside the oil-gas separator and is used to pressurize the incoming natural gas. The output end of the motor is connected to the screw compressor for driving the screw compressor to operate. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated during the operation of the screw compressor. The sewage discharge mechanism specifically includes: The first sewage pipe network is connected to the first dewatering tank and is used to discharge the sewage generated by the first dewatering tank into the external sewage pipe network; The second sewage network is connected to the dehydrogenation unit and is used to discharge the wastewater generated by the dehydrogenation unit into the external sewage network.

2. A gas recovery device for comprehensive treatment of associated gas in oil fields according to claim 1, characterized in that, The adjustable valve components specifically include: valve one, valve two, valve three, valve four, valve five, and valve six. When the first desulfurization tower and the second desulfurization tower are connected in parallel, valves one, two, five, and six are open, and valves three and four are closed. When the first desulfurization tower and the second desulfurization tower are connected in series, valves one, three, and six are open, and valves two, four, and five are closed, or valves one, three, and six are closed, and valves two, four, and five are open.

3. A gas recovery device for comprehensive treatment of associated gas in oil fields according to claim 1, characterized in that, The cooling assembly specifically includes an evaporator, a cooler, and a refrigeration unit. The evaporator is connected to an adjustable desulfurization mechanism and is used to cool the desulfurized associated gas from the oilfield and to deliver the cooled associated gas to a second dehydration tank. The refrigeration unit is connected to the evaporator and is used to return the refrigerant that has absorbed heat in the evaporator to the cooler. The cooler is connected to the refrigeration unit and is used to cool the returned refrigerant with heat and to deliver the cooled refrigerant to the evaporator to continue cooling the associated gas from the oilfield. An expansion valve is connected between the evaporator and the cooler to throttle and reduce the pressure of the refrigerant output from the cooler.

4. A gas recovery device for comprehensive treatment of associated gas in oil fields according to claim 1, characterized in that, The cooling system specifically includes a radiator and an axial fan. The radiator is connected to an oil-gas separator to absorb heat from natural gas and lubricating oil. The axial fan is located on one side of the radiator and is used to blow away the heat absorbed by the radiator to achieve cooling.

5. A gas recovery device for comprehensive treatment of associated gas in oil fields according to claim 1, characterized in that, The first sewage discharge network specifically includes: a first sewage discharge shut-off valve and a first electric valve. The bottom output end of the first dehydration tank is connected to the first sewage discharge shut-off valve and the first electric valve. The first sewage discharge shut-off valve is used for manual sewage discharge, and the first electric valve is used for automatic sewage discharge. The first electric valve is sequentially connected to a motor compressor and a first check valve. The output end of the first check valve is connected to the external sewage network. A second sewage discharge shut-off valve is connected in parallel to both ends of the first electric valve, and a third sewage discharge shut-off valve is connected in parallel to both ends of the motor compressor.

6. A gas recovery device for comprehensive treatment of associated gas in oil fields according to claim 5, characterized in that, The second sewage discharge network specifically includes: a fourth sewage discharge shut-off valve and a second electric valve. The dehydrogenation mechanism is connected to the fourth sewage discharge shut-off valve and the second electric valve. The fourth sewage discharge shut-off valve is used for manual sewage discharge, and the second electric valve is used for automatic sewage discharge. The second electric valve is connected to a second check valve, which is connected to a motor compressor. A fifth sewage discharge shut-off valve is connected in parallel to both ends of the second electric valve.

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