A pretreatment equipment for produced gas from oil development using CO2 flooding

Abstract

The application relates to the technical field of oilfield produced gas separation treatment, and particularly discloses a CO2 flooding produced gas pretreatment equipment for oil exploitation, which has the technical features that the pretreatment box body is internally fixedly connected with a flooding produced gas collecting tank at the rear side space, and a gas separation treatment box is arranged at the front side space in the inner cavity of the pretreatment box body. In the scheme, a multistage spraying structure is designed to atomize ammonia water solution, copper ammonia complex solution, sodium sulfite solution and sodium hydroxide solution in sequence, so that the flooding produced gas fully contacts and reacts with the atomized gas, the harmful gas in the flooding produced gas is comprehensively pretreated through a dissolution reaction and adsorption, and the treatment rate of the harmful gas is improved. In addition, the pretreatment station is loaded into a container frame structure, the pretreatment station can be moved along with the replacement of the oil flooding site, and the container frame structure can protect the mechanism for treating the harmful gas and the tank body for storing the flooding produced gas.

Description

Technical Field

[0001] This invention relates to the field of oilfield produced gas separation and treatment technology, and more specifically, to a CO2-driven produced gas pretreatment device for oil extraction. Background Technology

[0002] In recent years, several new technologies have emerged in oil extraction, such as CO2 flooding technology. The principle of CO2 flooding technology is to inject high-pressure carbon dioxide into the oil reservoir to improve oil recovery. Initially, carbon dioxide does not form a miscible phase with the formation crude oil. However, under suitable pressure, temperature, and crude oil composition conditions, carbon dioxide can form a miscible front. Supercritical fluids extract heavier hydrocarbons from the crude oil and continuously concentrate the gas at the displacement front. Thus, carbon dioxide and crude oil become a miscible liquid, forming a single liquid phase, which can effectively displace the formation crude oil to the production well.

[0003] In CO2-based oil recovery, approximately 40% of the CO2 gas returns to the surface along with the extracted oil, and the CO2 content increases further in the later stages of extraction. Besides CO2, the recovered gas also contains significant amounts of harmful gases such as hydrogen sulfide, carbon monoxide, sulfur dioxide, and nitrogen dioxide. Therefore, pretreatment of the recovered gas is necessary. This pretreatment includes dehydration and dust removal to prevent moisture, dust, and harmful gases from affecting subsequent separation processes, thus facilitating better carbon dioxide separation and recovery and improving separation efficiency.

[0004] A search revealed that Chinese patent CN117654210A discloses a carbon dioxide pretreatment device for produced gas from oilfield drilling. The disclosed content includes: a U-shaped frame designed in the air intake device, with water-absorbing material inside the U-shaped frame to dehydrate the raw gas; a roller shaft driving an electrostatic belt to rotate in a cyclical manner within the treatment chamber, using the static electricity generated by friction between the electrostatic belt and the electrostatic generator to adsorb dust and other impurities in the raw gas; and simultaneously, an adsorption shell on the inner wall of the electrostatic belt adsorbs toxic gases from the raw gas through adsorption holes.

[0005] However, since the harmful gases in the produced gas contain a variety of different components, the aforementioned patent literature describes a physical treatment method that uses an adsorption shell on the inner wall of an electrostatic strip to adsorb toxic gases from the raw gas through adsorption pores. This physical adsorption method cannot achieve a high treatment rate and the treatment quality is not high. Furthermore, existing technologies for pretreatment of produced gas mainly focus on carbon dioxide recovery, lacking equipment capable of pretreating harmful gases.

[0006] Therefore, this application provides a CO2-driven gas pretreatment device for oil extraction to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems mentioned in the background section and to provide a pretreatment device for produced gas produced by CO2 drive in oil extraction.

[0008] The above-mentioned objective of the present invention is achieved as follows: The present invention provides a CO2-driven gas pretreatment device for oil extraction, including a pretreatment box, wherein a gas collection tank is fixedly connected to the rear side of the pretreatment box, and a gas separation treatment box is provided on the front side of the pretreatment box; wherein the gas separation treatment box includes a hydrogen sulfide gas removal box, a carbon monoxide gas removal box, a sulfur dioxide gas removal box, and a nitrogen dioxide gas removal box. The pretreatment box includes a base, four longitudinal support beams fixed at the four corners of the upper surface of the base, and a rectangular frame fixed to the top end face of the longitudinal support beams. Two opposing observation doors are installed on the front end face of the longitudinal support beams. A surrounding plate is fixedly connected to the rear end face of the longitudinal support beams. Side plates are welded to both the left and right end faces of the longitudinal support beams. A side observation door is inlaid in the front area inside the side plate. The gas extraction and collection tank includes a tank body, an air inlet port fixed to the upper surface of the tank body, and a hollow tube fixed to the lower port of the air inlet port and extending into the inner cavity of the tank body. The hollow tube is filled with drying cotton and the upper port of the air inlet port is connected to a connecting pipe. In this scheme, after the oil and gas undergo pretreatment, it enters the inlet port and the hollow tube through a connecting pipe. The drying cotton inside the hollow tube absorbs any residual moisture in the oil and gas. The dried oil and gas is then compressed and stored inside the tank by a compressor. Once the tank is full, the moisture is released using a release valve at the rear of the tank. After the oil and gas pretreatment is complete, the solution inside the spray tank flows back to the reagent tank through a one-way valve, or is cleaned through the drain ports at the bottom of the spray tank and reagent tank.

[0009] The hydrogen sulfide gas removal box, carbon monoxide gas removal box, sulfur dioxide gas removal box, and nitrogen dioxide gas removal box all include a spray box body, a reagent tank fixed on the front surface of the spray box body, and a servo pump installed on the upper surface of the spray box body. The pumping port of the servo pump is connected to a pumping pipe that penetrates into the inner cavity of the reagent tank. The draining port of the servo pump is connected to a draining pipe that penetrates into the inner cavity of the spray box body. An atomizing nozzle is installed at the end of the draining pipe located in the inner cavity of the spray box body. In the above scheme, the gas extraction pipeline is connected to the inlet port of the centrifugal pump via a pipeline. The centrifugal pump draws the extracted gas into the spray chamber inside the hydrogen sulfide gas removal chamber. At this time, the servo pumps and booster pumps on the hydrogen sulfide, carbon monoxide, sulfur dioxide, and nitrogen dioxide gas removal chambers operate. The pumping pipeline draws ammonia solution, copper ammonia complex solution, sodium sulfite solution, and sodium hydroxide solution from the reagent tank and delivers them to the atomizing nozzle. The atomizing nozzle is responsible for atomizing the solution and spraying it from top to bottom. During the process of transporting the extracted gas through the gas guide pipe, the atomized treatment solution comes into contact with the harmful gases in the extracted gas, thereby dissolving and adsorbing the harmful gases, reducing the amount of harmful gases mixed in the extracted gas, and preventing the harmful gases from harming the operators without treatment.

[0010] A centrifugal air pump is installed on the left side wall of the spray box in the hydrogen sulfide gas removal box. The air inlet of the centrifugal air pump is connected to the exhaust gas produced by the drive through a pipe. The exhaust port of the centrifugal air pump is connected to a guide pipe that penetrates into the spray box inside the hydrogen sulfide gas removal box through a pipe joint.

[0011] Furthermore, a base plate is welded to the upper surface of the base, eight sets of rollers are installed on the bottom surface of the longitudinal support beam, and a lifting ring is welded to each of the four corners of the outer surface of the rectangular frame.

[0012] Furthermore, a square groove is fixedly connected to the top of the bottom plate on the upper surface of the base, and four U-shaped brackets are welded inside the square groove. The bottom surface of the tank is locked to the upper surface of the U-shaped brackets by bolts.

[0013] Furthermore, the front observation door, the side observation door, and the side panel are each provided with 1-4 ventilation holes, and ventilation fans are embedded inside the ventilation holes. The top surface of the top panel is provided with 3 maintenance manholes.

[0014] Furthermore, each of the spray chambers has a vent above its close connection point for airflow, and a laser liquid level sensor is installed on the inner wall of each spray chamber, located 3-5 cm below the vent.

[0015] Furthermore, the bottom surfaces of both the spray box and the reagent tank are fixedly connected to the upper surface of the base plate. A through hole is provided below the connection position of both the spray box and the reagent tank, and a one-way valve is installed inside the through hole to allow the solution at the bottom of the spray box to flow back into the reagent tank.

[0016] Furthermore, a partition is fixedly connected to the top of the inner cavity of the spray box. The top surface of the spray box and the inside of the partition are provided with round holes for the drainage pipe to pass through. The top surface of the medicine tank is provided with round holes for the extraction pipe to pass through, and the end of the extraction pipe away from the servo extraction pump passes through to the bottom area of ​​the inner cavity of the medicine tank.

[0017] Furthermore, a booster pump is fixedly connected to the top surface of the spray box. The inlet end of the booster pump is connected to the outlet port of the servo pump, and the delivery port of the booster pump is connected to the outlet pipe.

[0018] Furthermore, the left side surface of the spray box in the hydrogen sulfide gas removal box is provided with a through hole for the gas guide pipe to pass through, the upper surface of the spray box in the nitrogen dioxide gas removal box is provided with a port for connecting to the end of the connecting pipe away from the tank, and the rear surface of the spray box is provided with a solution release port; the top of the reagent tank is provided with a liquid injection port.

[0019] Furthermore, the rear end face of the tank is provided with a gas exhaust valve, the upper surface of the tank is provided with an opening for the air inlet port to pass through, the top port of the hollow tube is connected to the lower port of the air inlet port by a flange, and the inner side wall of the hollow tube is provided with a groove for the drying cotton to be clamped.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. In the pretreatment equipment of the present invention, a multi-stage spray method is specifically designed to treat and remove harmful gases from the produced gas. In the structural design of the harmful gas removal treatment, ammonia solution, copper ammonia complex solution, sodium sulfite solution and sodium hydroxide solution are atomized in sequence to allow the produced gas to come into full contact with the spray in sequence. The hydrogen sulfide gas, carbon monoxide gas, sulfur dioxide gas and nitrogen dioxide gas contained in the produced gas are pretreated by dissolution, adsorption and reaction. This removal method can achieve complete removal of harmful gases. 2. The solution of the present invention designs the pretreatment equipment as a box-shaped structure, and designs a lifting ring that can be suspended by a crane above the pretreatment equipment with the box structure, and designs rollers that can be pulled by a tractor at the bottom. This enables the pretreatment equipment to be moved with the change of oil flooding site, and the external structure of the pretreatment equipment can protect the mechanism for treating harmful gases and the tank for storing the flooded gas designed inside it. 3. In the solution of the present invention, the bottom of the spray box 16 is connected to the reagent box 19 and the solution is returned through a one-way valve, so that the unreacted solution can be reused, which can reduce the operating cost of the pretreatment equipment, reduce the waste of resources and the impact on the environment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the CO2-driven gas pretreatment equipment for oil extraction in this embodiment. Figure 2 This is a schematic diagram of the pretreatment box in this embodiment; Figure 3 This is a schematic diagram of the harmful gas separation and treatment mechanism in this embodiment; Figure 4 This is a schematic diagram of the gas separation box in this embodiment; Figure 5 This is a schematic diagram of the structure of the gas extraction collection tank in this embodiment.

[0022] Reference numerals used in the above figures: 1. Pretreatment chamber; 2. Base; 3. Front observation door; 4. Longitudinal support beam; 5. Rectangular frame; 6. Top plate; 7. Side plate; 8. Side observation door; 9. Gas collection tank; 10. Tank body; 11. Air inlet port; 12. Drying cotton; 13. Hollow pipe; 14. Connecting pipe; 15. Hydrogen sulfide gas removal chamber; 16. Spray chamber; 17. Servo pump; 18. Partition; 19. Chemical tank; 20. Pumping pipe; 21. Atomizing nozzle; 22. Drainage pipe; 23. Oxygen monoxide 24. Carbon gas removal box; 25. Sulfur dioxide gas removal box; 26. Nitrogen dioxide gas removal box; 27. Centrifugal air pump; 28. Air guide pipe; 29. ​​Base plate; 20. Lifting ring; 30. Inspection window; 31. Roller; 32. U-shaped bracket; 33. Square groove; 34. Compressor; 35. Barometer; 36. Petroleum gas discharge valve; 37. Liquid injection port; 38. Vent; 39. Laser liquid level sensor; 40. Solution release port; 41. One-way valve; 42. Booster pump; 43. Slot. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0025] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] See Figures 1-5 As shown, the following are preferred embodiments provided by the present invention.

[0027] Example: The solution provided in this embodiment of the invention is a pretreatment equipment for produced gas from CO2-driven oil extraction. See [link to example]. Figure 1 and Figure 3 As shown, the basic structural design of the pretreatment equipment includes a pretreatment box 1, a gas collection tank 9 is fixedly installed at the rear side of the pretreatment box 1, and a gas separation and processing box is installed at the front side of the inner cavity of the pretreatment box 1.

[0028] In this embodiment, the gas separation and treatment boxes include a hydrogen sulfide gas removal box 15, a carbon monoxide gas removal box 23, a sulfur dioxide gas removal box 24, and a nitrogen dioxide gas removal box 25. Correspondingly, the hydrogen sulfide gas removal box 15 is sprayed with a 25%-28% ammonia solution to dissolve the hydrogen sulfide gas in the produced gas; the carbon monoxide gas removal box 23 is sprayed with a copper-ammonia complex solution; the sulfur dioxide gas removal box 24 is sprayed with a sodium sulfite solution; and the nitrogen dioxide gas removal box 25 is sprayed with a sodium hydroxide solution. Through these gas separation and treatment boxes, as the produced gas flows laterally through each box, the harmful gases in the produced gas are thoroughly mixed and reacted with the atomized solution sprayed from top to bottom, achieving the removal of harmful gases from the produced gas. The produced gas, now free of harmful gases, then enters the tank 10.

[0029] See Figure 2As shown, the pretreatment box 1 has a base 2, four longitudinal support beams 4 fixedly welded or bolted at the four corners of the top surface of the base 2, a rectangular frame 5 fixedly connected to the top of the longitudinal support beams 4 by welding or bolting, two opposing observation doors 3 installed on the front end face of the longitudinal support beams 4, a surrounding plate fixedly connected to the rear end face of the longitudinal support beams 4, and side plates 7 welded to the left and right end faces of the longitudinal support beams 4. A side observation door 8 is embedded in the front area inside the side plate 7.

[0030] See Figure 5 As shown, the gas extraction collection tank 9 in this embodiment includes a tank body 10. An air inlet port 11 is designed at the top of the tank body 10. A hollow tube 13, penetrating into the inner cavity of the tank body 10, is installed at the bottom of the air inlet port 11. Drying cotton 12 is snap-fitted into the interior of the hollow tube 13. A connecting pipe 14 is connected to the top of the air inlet port 11. A barometer 35 and a compressor 34 connected to the lower port of the hollow tube 13 are installed inside the tank body 10. The compressor 34 is used to simply compress and store the extracted gas after the drying cotton 12 has absorbed moisture inside the tank body 10. In this embodiment, the drying cotton 12 is cylindrical, and its interior is designed with a plurality of honeycomb pores (not shown in the figure) distributed in a rectangular array. Porous solid desiccant (not shown in the figure) is filled inside the honeycomb pores.

[0031] See Figure 2 As shown, in this embodiment, the base 2 has a base plate 28 welded to its top surface, eight sets of rollers 31 are installed on the bottom surface of the longitudinal support beam 4, and a lifting ring 29 is welded to each of the four corners of the outer surface of the rectangular frame 5. A square groove 33 is fixedly connected to the top of the base plate 28 on the upper surface of the base 2. Four U-shaped brackets 32 are welded inside the square groove 33. The bottom surface of the tank body 10 is bolted to the upper surface of the U-shaped brackets 32. The front observation door 3, the side observation door 8 and the side plate 7 are each provided with 1-4 ventilation holes. Ventilation fans are embedded in the ventilation holes. The top surface of the top plate 6 is provided with 3 maintenance windows 30.

[0032] See Figure 4As shown, the hydrogen sulfide gas removal chamber 15, carbon monoxide gas removal chamber 23, sulfur dioxide gas removal chamber 24, and nitrogen dioxide gas removal chamber 25 in this embodiment have the same structural design, all including a spray chamber 16. A reagent tank 19 is fixedly installed on the front surface of the spray chamber 16. A servo pump 17 is installed on the top of the spray chamber 16. The pumping end of the servo pump 17 is connected to a pumping pipe 20 that penetrates into the inner cavity of the reagent tank 19. The draining end of the servo pump 17 is connected to a draining pipe 22 that penetrates into the inner cavity of the spray chamber 16. An atomizing nozzle 21 is installed at the end of the draining pipe 22 located in the inner cavity of the spray chamber 16. Through the structural design of the above components, the reagent solution that reacts with the corresponding harmful gas to be removed in the hydrogen sulfide gas removal chamber 15, carbon monoxide gas removal chamber 23, sulfur dioxide gas removal chamber 24, and nitrogen dioxide gas removal chamber 25 can be sprayed and atomized.

[0033] See Figure 4 As shown, in this embodiment, a centrifugal air pump 26 is installed on the left side wall of the spray box 16 of the hydrogen sulfide gas removal box 15. The air inlet of the centrifugal air pump 26 is connected to the exhaust gas produced by the drive through a pipe, and the exhaust port of the centrifugal air pump 26 is connected to a gas guide pipe 27 that penetrates into the interior of the spray box 16 of the hydrogen sulfide gas removal box 15 through a pipe joint.

[0034] See Figure 4 As shown, in this embodiment, each spray box 16 has a vent 38 above its connection point for airflow. A laser level sensor 39 is installed on the inner wall of each spray box 16, located 3-5 cm below the vent 38. The bottom surfaces of the spray box 16 and the reagent tank 19 are fixedly connected to the upper surface of the base plate 28. Through holes are provided below the connection points of the spray box 16 and the reagent tank 19. A one-way valve 41 is installed inside each through hole to allow the solution at the bottom of the spray box 16 to flow back into the reagent tank 19.

[0035] See Figure 4 As shown, in this embodiment, a partition 18 is fixedly connected to the top of the inner cavity of the spray box 16. The top surface of the spray box 16 and the inside of the partition 18 are both provided with circular holes for the drainage pipe 22 to pass through. The top surface of the medicine tank 19 is provided with a circular hole for the extraction pipe 20 to pass through. The end of the extraction pipe 20 away from the servo extraction pump 17 passes through to the bottom area of ​​the inner cavity of the medicine tank 19. Furthermore, a booster pump 42 is fixedly connected to the top surface of the spray box 16. The inlet end of the booster pump 42 is connected to the drainage port of the servo extraction pump 17, and the delivery port of the booster pump 42 is connected to the drainage pipe 22.

[0036] See Figure 4As shown, in this embodiment, the left side surface of the spray box 16 of the hydrogen sulfide gas removal box 15 has a through hole for the gas guide pipe 27 to pass through, the upper surface of the spray box 16 of the nitrogen dioxide gas removal box 25 has a port (not shown in the figure) that connects to the end of the connecting pipe 14 away from the tank 10, the rear side surface of the spray box 16 has a solution release port 40, and the top of the reagent tank 19 has a liquid injection port 37.

[0037] See Figure 5 As shown, a gas exhaust valve is designed on the rear end face of the tank body 10. The upper surface of the tank body 10 is provided with an opening for the air inlet port 11 to pass through. The top port of the hollow tube 13 is connected to the lower port of the air inlet port 11 by a flange. A slot 43 (not shown in the figure) is designed on the inner wall of the hollow tube 13 for the drying cotton 12 to be snapped in, which facilitates the installation and removal of the drying cotton 12.

[0038] Through the above-described embodiments of the present invention, compared with the prior art, the solution of the present invention has the following advanced design features: 1. Regarding the mobility and protective design of the pretreatment equipment of the present invention: Mobility: The pretreatment box 1 is equipped with eight sets of rollers 31 at the bottom, and lifting rings 29 are welded at the four corners of the outer surface of the rectangular frame 5, which facilitates the multiple ways of moving the pretreatment box 1 (towing or lifting by a crane). When it is necessary to change the work site, it can be quickly moved by a towing vehicle or a crane, which can easily adapt to different site conditions of oil extraction and significantly improve the flexibility of the pretreatment equipment.

[0039] Protection: In the structural design of the present invention, a pretreatment box 1 is designed, which not only provides physical protection for the gas extraction and treatment mechanism and storage tank structure inside, but also prevents the external environment from damaging the equipment; this structural design can avoid the risk of equipment damage and is especially suitable for harsh oilfield extraction environments.

[0040] 2. Regarding the multi-stage spray system designed in the pretreatment equipment, it is used to remove various unwanted and harmful gases from the produced gas: Design of the Gas Separation and Treatment Box: This application installs multiple different gas separation and treatment boxes (including hydrogen sulfide gas removal box 15, carbon monoxide gas removal box 23, sulfur dioxide gas removal box 24, and nitrogen dioxide gas removal box 25) at the front of the pretreatment box 1 to achieve multi-stage spraying of the produced gas. A servo pump 17 and a booster pump 42 are used to extract the solution from the reagent tank 19 and transport it to the spray box 16 for spraying. During the spraying process to remove harmful gases: hydrogen sulfide gas in the produced gas reacts with ammonia solution to form soluble products; carbon monoxide gas combines with a copper ammonia complex solution and is removed; sulfur dioxide gas reacts with sodium sulfite solution to reduce its concentration and is removed; and nitrogen dioxide gas is neutralized by sodium hydroxide solution. This multi-stage treatment mode for the produced gas ensures thorough purification of harmful gases, greatly improving the safety of subsequent operations.

[0041] 3. Further optimization of the pretreatment of produced gas after flooding through drying and compressed storage: A drying module was designed: the pretreated gas produced by the drive is connected to the tank 10 via a connecting pipe 14. The hollow tube 13 of the connecting pipe 14 is filled with drying cotton 12 to absorb residual moisture, and the dried gas is further processed by a compressor 34.

[0042] A storage module was designed: a pressure gauge 35 and a release valve are installed inside the tank 10 to facilitate real-time monitoring of the storage status and safe release of gas.

[0043] The design of the above-mentioned technical points combines drying and storage functions, reducing the need for separate use of different equipment as in existing technologies and improving operational efficiency.

[0044] 4. The design for solution recovery and reuse reduces resource waste and environmental impact: Solution recovery: In the above scheme, the bottom of the spray box 16 is connected to the reagent tank 19, and the solution is returned through a one-way valve, so that the unreacted solution can be reused, which can reduce the operating cost of the pretreatment equipment.

[0045] Design and use of the drying structure: The drying cotton 12 is designed with a porous structure and filled with desiccant, which gives it a larger specific surface area, making the adsorption and drying effect significant. In addition, the drying structure is easy to replace and regenerate.

[0046] 5. The intelligent functions and convenient maintenance design of this pretreatment equipment ensure its efficient operation: Application of laser level sensor 39: A laser level sensor 39 is installed on the inner wall of the spray box 16 to monitor the liquid level of the agent in real time, which can prevent malfunctions caused by insufficient solution.

[0047] Observation and maintenance: A front observation door 3 and a side observation door 8 are provided on the side of the pretreatment box 1, and an inspection window 30 is designed on the top of it to facilitate the inspection and maintenance of the pretreatment equipment.

[0048] Ventilation and cooling: Ventilation holes and ventilation fans are designed for the pretreatment chamber 1 to prevent the internal temperature of the pretreatment chamber 1 from being too high and affecting the operation of the equipment.

[0049] 6. Modular separation and integrated remote monitoring design: The gas separation and treatment chamber features a modular design, comprising multiple modules for hydrogen sulfide removal, carbon monoxide removal, sulfur dioxide removal, and nitrogen dioxide removal. Each removal module is equipped with an independent spray chamber 16, a servo pump 17, a reagent tank 19, and an atomizing nozzle 21. Connecting to the main pipeline via quick-connect couplings allows each module to operate independently, sequentially treating different components of the harmful gas.

[0050] The pretreatment equipment in the above embodiments of the present invention may also be equipped with a remote monitoring system: Internet of Things (IoT) module: This module is installed in the control center to collect data from the sensors in the above implementation scheme.

[0051] Communication: Data is uploaded to the cloud platform via the Internet of Things (IoT) module.

[0052] Remote monitoring platform: used to monitor the operating status of servo pumping, booster pump 42, laser level sensor 39 and centrifugal air pump 26.

[0053] Alarm: Notify the user of operational abnormalities via SMS or application, such as insufficient solution in the medicine tank 19 or blockage in the gas delivery tube 27.

[0054] Self-diagnosis and early warning: The laser liquid level sensor 39 is installed on the side wall of the spray box 16 to monitor the solution position in real time and avoid operational failures.

[0055] Temperature control inside the pretreatment chamber 1: A heating device and cooling coil can also be installed in the pretreatment equipment to ensure that the temperature of the solution in the reagent tank 19 and the stored gas produced by the flooding can adapt to extreme environments.

[0056] Environmental protection and resource utilization optimization: The design incorporates the recycling of the spray atomization solution. The bottom of the spray box 16 and the reagent tank 19 are connected by a one-way valve 41, which allows unused solution to flow back to the reagent tank 19 for easy reuse.

[0057] Working principle: First, the crane hooks are used to hook the lifting rings 29 at the four corners of the rectangular frame 5, and the pretreatment equipment can be moved to the working position in the gas extraction area by the crane; or the pretreatment equipment can be moved to the working position in the extraction area by using the multiple sets of rollers 31 at the bottom of the base 2 by the traction equipment (tractor).

[0058] Then, after the pretreatment equipment is installed, the exhaust gas pipeline is connected to the air inlet port 11 of the centrifugal air pump 26 via a pipeline. The centrifugal air pump 26 draws the exhaust gas into the spray box 16 inside the hydrogen sulfide gas removal box 15. At this time, the servo pump 17 and booster pump 42 on the hydrogen sulfide gas removal box 15, carbon monoxide gas removal box 23, sulfur dioxide gas removal box 24, and nitrogen dioxide gas removal box 25 work, and cooperate with the pumping pipeline 20 to pump the reagents from the reagent tank 19. The ammonia solution, copper ammonia complex solution, sodium sulfite solution, and sodium hydroxide solution are drawn from the part and transported to the atomizing nozzle 21. The atomizing nozzle 21 atomizes the solution and sprays it from top to bottom. At the same time, during the process of transporting the produced gas through the gas guide pipe 27, the atomized treatment solution comes into full contact with the harmful gases in the produced gas, thereby dissolving, adsorbing and reacting with the harmful gases, removing the harmful gases mixed in the produced gas, and preventing the harmful gases from harming the operators without treatment.

[0059] Then, after the produced gas undergoes harmful gas pretreatment, it enters the inlet port 11 and the hollow pipe 13 along the connecting pipe 14. The drying cotton 12 inside the hollow pipe 13 adsorbs any residual moisture in the gas. The dried oil and gas is then compressed and stored inside the tank 10 by the compressor 34. Once the tank 10 is full, the moisture is released using the release valve at the rear end of the tank 10. After the produced gas pretreatment is complete, the solution inside the spray box 16 flows back to the reagent tank 19 along the one-way valve 41, or is cleaned through the drain ports at the bottom of the spray box 16 and the reagent tank 19.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pretreatment device for produced gas from oil extraction using CO2 flooding, characterized in that, The pretreatment box (1) is characterized in that: a gas collection tank (9) is fixedly connected to the rear side of the interior of the pretreatment box (1), and a gas separation treatment box is provided on the front side of the inner cavity of the pretreatment box (1); the gas separation treatment box includes a hydrogen sulfide gas removal box (15), a carbon monoxide gas removal box (23), a sulfur dioxide gas removal box (24), and a nitrogen dioxide gas removal box (25); The pretreatment box (1) also includes a base (2), four longitudinal support beams (4) fixed at the four corners of the top surface of the base (2) and a rectangular frame (5) fixed at the top end of the longitudinal support beams (4). Two opposing front observation doors (3) are installed on the front end of the longitudinal support beams (4). A surrounding plate is fixedly connected to the rear end of the longitudinal support beams (4). Side plates (7) are fixedly connected to both the left and right end of the longitudinal support beams (4). A side observation door (8) is installed in the front area of ​​the side plate (7). The gas extraction collection tank (9) includes a tank body (10), an air inlet port (11) fixed to the top of the tank body (10), and a hollow tube (13) fixed to the lower end of the air inlet port (11) and extending into the inner cavity of the tank body (10). The hollow tube (13) is provided with drying cotton (12), and the top end of the air inlet port (11) is connected to a connecting pipe (14). The hydrogen sulfide gas removal box (15), carbon monoxide gas removal box (23), sulfur dioxide gas removal box (24) and nitrogen dioxide gas removal box (25) each include a spray box body (16), a reagent box (19) fixed on the front surface of the spray box body (16) and a servo pump (17) installed on the top of the spray box body (16). The pumping end of the servo pump (17) is connected to a pumping pipe (20) that penetrates into the inner cavity of the reagent box (19). The draining end of the servo pump (17) is connected to a draining pipe (22) that penetrates into the inner cavity of the spray box body (16). An atomizing nozzle (21) is installed at the end of the draining pipe (22) located in the inner cavity of the spray box body (16). A centrifugal air pump (26) is installed on the left side wall of the spray box (16) of the hydrogen sulfide gas removal box (15). The air inlet of the centrifugal air pump (26) is connected to the exhaust gas produced by the drive through a pipe. The exhaust end of the centrifugal air pump (26) is connected to a guide pipe (27) that penetrates into the interior of the spray box (16) of the hydrogen sulfide gas removal box (15).

2. The CO2-driven gas pretreatment equipment for oil extraction according to claim 1, characterized in that: The base (2) has a bottom plate (28) on its top surface, eight sets of rollers (31) are installed at the bottom of the longitudinal support beam (4), and a lifting ring (29) is provided at each of the four corners of the rectangular frame (5).

3. The CO2-driven gas pretreatment equipment for oil extraction according to claim 2, characterized in that: The top of the base plate (28) is fixedly connected to a square groove (33), and four U-shaped brackets (32) are spaced apart inside the square groove (33). The bottom surface of the tank body (10) is locked to the U-shaped brackets (32) by bolts.

4. The CO2-driven gas pretreatment equipment for oil extraction according to claim 1, characterized in that: The front observation door (3), the side observation door (8) and the side plate (7) are each provided with 1-4 ventilation holes, and ventilation fans are installed at the ventilation holes. The top surface of the top plate (6) is provided with 3 maintenance windows (30).

5. A pretreatment device for produced gas from CO2-driven oil extraction according to claim 1, characterized in that: The spray boxes (16) are all provided with ventilation openings (38) above the connection points of each other to allow airflow. Laser liquid level sensors (39) are installed on the inner side walls of the spray boxes (16) and are located 3-5 cm below the ventilation openings (38).

6. A pretreatment device for produced gas from CO2-driven oil extraction according to claim 1, characterized in that: The bottom surfaces of the spray box (16) and the reagent tank (19) are fixedly connected to the upper surface of the base plate (28). The spray box (16) and the reagent tank (19) are connected by through holes. One-way valves (41) are installed inside the through holes to allow the solution at the bottom of the spray box (16) to flow back into the reagent tank (19).

7. A pretreatment device for produced gas from CO2-driven oil extraction according to claim 1, characterized in that: A partition plate (18) is fixedly connected to the top of the inner cavity of the spray box (16). The top surface of the spray box (16) and the inside of the partition plate (18) are provided with round holes for the drainage pipe (22) to pass through. The top surface of the medicine box (19) is provided with round holes for the pumping pipe (20) to pass through. The end of the pumping pipe (20) away from the servo pumping pump (17) passes through to the bottom area of ​​the inner cavity of the medicine box (19).

8. A pretreatment device for produced gas from CO2-driven oil extraction according to claim 1, characterized in that: A booster pump (42) is fixedly connected to the top surface of the spray box (16). The inlet end of the booster pump (42) is connected to the outlet port of the servo pump (17), and the delivery port of the booster pump (42) is connected to the outlet pipe (22).

9. A pretreatment device for produced gas from CO2-driven oil extraction according to claim 1, characterized in that: The left side surface of the spray box (16) of the hydrogen sulfide gas removal box (15) is provided with a through hole for the gas guide pipe (27) to pass through. The top surface of the spray box (16) of the nitrogen dioxide gas removal box (25) is provided with a port for connecting to the end of the connecting pipe (14) away from the tank (10). The rear side surface of the spray box (16) is provided with a solution release port (40). The top of the reagent tank (19) is provided with a liquid injection port (37).

10. A CO2-driven gas pretreatment device for oil extraction according to claim 1, characterized in that: The rear end face of the tank (10) is provided with a gas exhaust valve, the upper surface of the tank (10) is provided with an opening for the air inlet port (11) to pass through, the top port of the hollow tube (13) and the lower port of the air inlet port (11) are connected by a flange, and the inner wall of the hollow tube (13) is provided with a groove (43) for the drying cotton (12) to be snapped in.

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