Carbon dioxide gas floatation oil extraction apparatus

Abstract

The utility model discloses a kind of carbon dioxide gas float oil extraction equipment, belong to oilfield equipment field, including carbon dioxide steel bottle, pipeline mixer, dehydration tower, dehydration tower bottom pump, degassing tower and degassing tower bottom pump;Pipeline mixer includes first inlet end, second inlet end and outlet end, dehydration tower includes feed inlet, oil slick outlet, drain and oil return, dehydration tower is equipped with oil slick packing and submerged packing, first inlet end and carbon dioxide steel bottle are communicated, second inlet end is used to pass into crude oil, outlet end and feed inlet are communicated;Degassing tower includes oil slick inlet, safety relief port, exhaust port and oil outlet, degassing tower is equipped with demulsification packing and degassing packing;Oil slick inlet and oil slick outlet are communicated, dehydration tower bottom pump and drain are communicated, the oil inlet end of degassing tower bottom pump and oil outlet are communicated, oil outlet end and oil return are communicated, to be able to realize the oil extraction treatment of carbon dioxide.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield equipment technology, specifically relating to a carbon dioxide flotation oil extraction device. Background Technology

[0002] Air flotation oil removal is a technology that uses gases (such as air, nitrogen, or carbon dioxide) to generate tiny bubbles in a liquid, causing oil droplets to adhere to the bubbles and float to the liquid surface, thus achieving oil-water separation. Air flotation oil extraction equipment is an oil extraction device based on air flotation oil removal technology. Air flotation oil removal significantly reduces dissolved oil in water, but the recovered oil layer consists of dense, thick air bubbles containing a large amount of gas.

[0003] Typically, using air for flotation oil removal is only suitable for non-explosion-proof applications, while nitrogen has extremely poor water solubility, resulting in significant energy waste when used as a working medium. Therefore, carbon dioxide, with its advantages of high water solubility, pressure reduction, easy release into microbubbles, lack of petroleum combustion support, and high production volume, can simultaneously meet the requirements of safety, energy conservation, and economy. Furthermore, trace amounts of carbon dioxide supplementation can significantly improve crude oil dehydration efficiency, especially in late-stage chemical flooding oilfields where oil-water separation is more pronounced. Therefore, a carbon dioxide flotation oil extraction system is urgently needed. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a carbon dioxide flotation oil extraction device. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] In the first aspect, this utility model provides a carbon dioxide flotation oil extraction device, including a carbon dioxide cylinder, a pipeline mixer, a dehydration tower, a dehydration tower bottom pump, a degassing tower, and a degassing tower bottom pump.

[0006] The pipeline mixer includes a first inlet end, a second inlet end, and an outlet end. The dehydration tower includes a feed inlet, a floating oil outlet, a drain outlet, and a return oil outlet. The dehydration tower is equipped with floating oil packing and submerged water packing. The floating oil outlet and the drain outlet are located at the upper and lower ends of the dehydration tower, respectively. The floating oil packing is located on the upper side of the submerged water packing. The feed inlet and the return oil outlet are both located between the floating oil packing and the submerged water packing. The first inlet end is connected to a carbon dioxide cylinder. The second inlet end is used to introduce crude oil. The outlet end is connected to the feed inlet.

[0007] The degassing tower includes a floating oil inlet, a safety relief port, an exhaust port, and an oil outlet. The degassing tower is equipped with defoaming packing and degassing packing. The safety relief port and the oil outlet are located at the upper and lower ends of the degassing tower, respectively. The defoaming packing is located on the upper side of the degassing packing. The floating oil inlet is located between the defoaming packing and the degassing packing. The exhaust port is located above the defoaming packing.

[0008] The floating oil inlet and floating oil outlet are connected, the dehydration tower bottom pump and the drain outlet are connected, the degassing tower bottom pump's oil inlet and oil outlet are connected, and the oil outlet and oil return outlet are connected.

[0009] In one embodiment of this utility model, a heat exchanger is also included, one end of which is connected to the floating oil inlet and the other end of which is connected to the floating oil outlet.

[0010] In one embodiment of this utility model, the heat exchanger is a shell-and-tube heat exchanger.

[0011] In one embodiment of this utility model, the pipeline mixer is a static spiral vane mixer.

[0012] In one embodiment of the present invention, the dehydration tower is a two-section packed vertical tower. The dehydration tower is provided with a first upper inspection hole, a first middle inspection hole and a first lower inspection hole. The first middle inspection hole is located between the floating oil packing and the submerged water packing. The first upper inspection hole is located above the floating oil packing and the first lower inspection hole is located below the submerged water packing.

[0013] The submersible packing material is a Pall ring packing material.

[0014] In one embodiment of the present invention, the degassing tower is a two-section packed vertical tower. The degassing tower is provided with a second upper inspection hole, a second middle inspection hole and a second lower inspection hole. The second middle inspection hole is located between the defoaming packing and the degassing packing. The second upper inspection hole is located above the defoaming packing and the second lower inspection hole is located below the degassing packing.

[0015] The degassing packing is a Pall ring packing.

[0016] In one embodiment of this utility model, it further includes an crude oil pipeline and a flushing pipeline. One end of the crude oil pipeline is used to input crude oil, and the other end is connected to the second inlet end. One end of the flushing pipeline is used to input flushing water, and the other end is connected to the crude oil pipeline.

[0017] The inlet and outlet of the dehydration tower bottom pump are connected. The inlet of the dehydration tower bottom pump is connected to an outlet pipe. The outlet pipe is connected to a first branch pipe and a second branch pipe. The first branch pipe is used to transport water to the outside, and the second branch pipe is connected to the flushing pipeline.

[0018] In one embodiment of this utility model, the dehydration tower bottom pump is a self-priming chemical centrifugal pump.

[0019] In one embodiment of this utility model, a level gauge is also included. The level gauge is fixed on the degassing tower. The oil outlet end of the bottom pump of the degassing tower is connected to an oil outlet pipe. The oil outlet pipe is connected to a first pipe, a second pipe, and a third pipe. The first pipe is connected to the level gauge, the second pipe is used to output oil to the outside, and the third pipe is connected to the oil return port.

[0020] In one embodiment of this utility model, the degassing tower bottom pump is a self-priming chemical centrifugal pump.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] In the above-mentioned scheme of this application, the carbon dioxide flotation oil extraction equipment includes a carbon dioxide cylinder, a pipeline mixer, a dehydration tower, a dehydration tower bottom pump, a degassing tower, and a degassing tower bottom pump; the pipeline mixer includes a first inlet end, a second inlet end, and an outlet end; the dehydration tower includes a feed inlet, a floating oil outlet, a drain outlet, and an oil return outlet; the dehydration tower is equipped with floating oil packing and submerged water packing; the floating oil outlet and drain outlet are located at the upper and lower ends of the dehydration tower, respectively; the floating oil packing is located above the submerged water packing; the feed inlet and oil return outlet are both located between the floating oil packing and the submerged water packing; the first inlet end and the carbon dioxide... The cylinder is connected, and the second inlet is used to introduce crude oil. The outlet is connected to the feed inlet. The degassing tower includes a floating oil inlet, a safety vent, an exhaust port, and an oil outlet. The degassing tower is equipped with defoaming packing and degassing packing. The safety vent and oil outlet are located at the upper and lower ends of the degassing tower, respectively. The defoaming packing is located on the upper side of the degassing packing. The floating oil inlet is located between the defoaming packing and the degassing packing. The exhaust port is located above the defoaming packing. The floating oil inlet and floating oil outlet are connected. The bottom pump of the degassing tower is connected to the drain outlet. The oil inlet and oil outlet of the bottom pump of the degassing tower are connected. The oil outlet and oil return port are connected. In this structure, carbon dioxide gas from the carbon dioxide cylinder enters the pipeline mixer through the first inlet, while crude oil enters the pipeline mixer through the second inlet, mixing the crude oil and carbon dioxide gas. The resulting gas-liquid mixture enters the dehydration tower through the feed inlet for dehydration. After being filtered by the floating oil packing, the mixture exits through the floating oil outlet and then enters the degassing tower through the floating oil inlet for degassing. Simultaneously, after being filtered by the submerged packing, the mixture is discharged through the drain outlet to the bottom pump of the dehydration tower. The mixture entering the degassing tower is filtered by the demister packing and discharged through the exhaust port and safety vent. Also, after being filtered by the degassing packing, the mixture is discharged through the oil outlet to the bottom pump of the degassing tower, thus achieving oil extraction from carbon dioxide. Furthermore, the bottom pump of the degassing tower can return the oil discharged through the oil outlet to the dehydration tower through the return port, achieving oil circulation.

[0023] The aforementioned equipment in this application uses carbon dioxide as the working gas. Due to its advantages such as fire and explosion resistance, easy solubility, and dense and uniform bubble release, carbon dioxide can improve the efficiency, safety, and quality of oil extraction. Separate dehydration and degassing towers are used to perform oil extraction from water and degassing from oil, respectively. Through two-stage reflux treatment, clear separation of oil, water, and gas can be ensured. Furthermore, carbon dioxide is inexpensive and readily available, safer than air, and more energy-efficient than nitrogen, offering advantages such as low cost, safety, and energy saving.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the carbon dioxide flotation oil extraction equipment in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the dehydration tower in an embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the degassing tower in an embodiment of this utility model.

[0028] Attached reference numerals: 1-Carbon dioxide cylinder, 2-Pipeline mixer, 3-Dehydration tower, 4-Dehydration tower bottom pump, 5-Heat exchanger, 6-Degassing tower, 7-Degassing tower bottom pump, 31-Inlet, 32-Floating oil packing, 33-Floating oil outlet, 34-Submerged packing, 35-Drain outlet, 36-Return oil outlet, 61-Floating oil inlet, 62-Defoaming packing, 63-Exhaust outlet, 64-Safety relief outlet, 65-Degassing packing, 66-Oil outlet, 67-Level gauge. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0030] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a carbon dioxide flotation oil extraction device, including a carbon dioxide cylinder 1, a pipeline mixer 2, a dehydration tower 3, a dehydration tower bottom pump 4, a degassing tower 6, and a degassing tower bottom pump 7. The pipeline mixer 2 includes a first inlet end, a second inlet end, and an outlet end. The dehydration tower 3 includes a feed inlet 31, a floating oil outlet 33, a drain outlet 35, and an oil return outlet 36. The dehydration tower 3 is equipped with floating oil packing 32 and submerged water packing 34. The floating oil outlet 33 and the drain outlet 35 are located at the upper and lower ends of the dehydration tower 3, respectively. The floating oil packing 32 is disposed above the submerged water packing 34. The feed inlet 31 and the oil return outlet 36 are both located between the floating oil packing 32 and the submerged water packing 34. The first inlet end and the carbon dioxide cylinder... 1. The second inlet is connected to crude oil, and the outlet is connected to the feed inlet 31. The degassing tower 6 includes a floating oil inlet 61, a safety relief port 64, an exhaust port 63, and an oil outlet 66. The degassing tower 6 is equipped with defoaming packing 62 and degassing packing 65. The safety relief port 64 and the oil outlet 66 are located at the upper and lower ends of the dehydration tower 3, respectively. The defoaming packing 62 is located on the upper side of the degassing packing 65. The floating oil inlet 61 is located between the defoaming packing 62 and the degassing packing 65. The exhaust port 63 is located above the defoaming packing 62. The floating oil inlet 61 is connected to the floating oil outlet 33. The dehydration tower bottom pump 4 is connected to the drain port 35. The oil inlet end of the degassing tower bottom pump 7 is connected to the oil outlet 66, and the oil outlet end is connected to the return oil port 36.

[0031] In some embodiments of this application, the carbon dioxide cylinders are commercially available standard 40L cylinders, multiple cylinders are grouped together for use, and they are alternately replaced. The overall structure is protected by a sturdy frame, and the rubber pads prevent wear and impact.

[0032] In the above-mentioned scheme of this application, the carbon dioxide flotation oil extraction equipment includes a carbon dioxide cylinder 1, a pipeline mixer 2, a dehydration tower 3, a dehydration tower bottom pump 4, a degassing tower 6, and a degassing tower bottom pump 7; the pipeline mixer 2 includes a first inlet end, a second inlet end, and an outlet end; the dehydration tower 3 includes a feed inlet 31, a floating oil outlet 33, a drain outlet 35, and an oil return outlet 36; the dehydration tower 3 is equipped with floating oil packing 32 and submerged water packing 34; the floating oil outlet 33 and the drain outlet 35 are located at the upper and lower ends of the dehydration tower 3, respectively; the floating oil packing 32 is located on the upper side of the submerged water packing 34; the feed inlet 31 and the oil return outlet 36 are both located between the floating oil packing 32 and the submerged water packing 34; the first inlet end is connected to the carbon dioxide cylinder 1. The second inlet is used to introduce crude oil, and the outlet is connected to the feed inlet 31. The degassing tower 6 includes a floating oil inlet 61, a safety relief port 64, an exhaust port 63, and an oil outlet 66. The degassing tower 6 is equipped with defoaming packing 62 and degassing packing 65. The safety relief port 64 and the oil outlet 66 are located at the upper and lower ends of the dehydration tower 3, respectively. The defoaming packing 62 is located on the upper side of the degassing packing 65. The floating oil inlet 61 is located between the defoaming packing 62 and the degassing packing 65. The exhaust port 63 is located above the defoaming packing 62. The floating oil inlet 61 is connected to the floating oil outlet 33. The dehydration tower bottom pump 4 is connected to the drain port 35. The oil inlet of the degassing tower bottom pump 7 is connected to the oil outlet 66, and the oil outlet is connected to the return oil port 36. In this structure, carbon dioxide gas from carbon dioxide cylinder 1 enters pipeline mixer 2 through the first inlet, while crude oil enters pipeline mixer 2 through the second inlet, mixing the crude oil and carbon dioxide gas. The resulting gas-liquid mixture enters dehydration tower 3 through feed inlet 31 for dehydration. After filtration through floating oil packing 32, the mixture exits through floating oil outlet 33 and enters degassing tower 6 through floating oil inlet 61 for degassing. Simultaneously, after filtration through submerged packing 34, the mixture is discharged through drain outlet 35 to dehydration tower bottom pump 4. The mixture entering degassing tower 6 is filtered through demister packing 62 and discharged through exhaust outlet 63 and safety vent 64. Also, after filtration through degassing packing 65, the mixture is discharged through oil outlet 66 to degassing tower bottom pump 7, thus achieving oil extraction from carbon dioxide. Furthermore, degassing tower bottom pump 7 can return the oil discharged through oil outlet 66 to dehydration tower 3 via return oil outlet 36, achieving oil circulation.

[0033] The aforementioned equipment in this application uses carbon dioxide as the working gas. Due to its advantages such as fire and explosion resistance, easy solubility, and dense and uniform bubble release, carbon dioxide can improve the efficiency, safety, and quality of oil extraction. Separate dehydration tower 3 and degassing tower 6 perform oil extraction from water and degassing from oil, respectively. Through two-stage reflux treatment, clear separation of oil, water, and gas can be ensured. Furthermore, carbon dioxide is inexpensive and readily available, safer than air, and more energy-efficient than nitrogen, offering advantages such as low cost, safety, and energy saving.

[0034] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the carbon dioxide flotation oil extraction equipment also includes a heat exchanger 5, one end of which is connected to the floating oil inlet 61, and the other end is connected to the floating oil outlet 33. Using this structure, heating the mixture through the heat exchanger 5 ensures clear separation of oil, water, and gas, while improving the efficiency and quality of oil extraction.

[0035] In some embodiments of this application, heat exchanger 5 is a shell-and-tube heat exchanger. Shell-and-tube heat exchangers are a common type of heat exchanger. They can be U-tube heat exchangers or internal floating head heat exchangers. Shell-and-tube heat exchangers are equipped with expansion joints to release thermal stress. The heat source can be medium- or low-pressure steam, thermal oil, or electric heating, or hot water with a temperature greater than 40°C, or waste heat recovery energy. Solar thermal collectors, heat pump air thermal energy, geothermal energy, etc., can also be used. Pressure and temperature sensors can be installed on the shell-and-tube heat exchanger.

[0036] In some embodiments of this application, the pipe mixer 2 is a static spiral vane mixer. Static spiral vane mixers are a common type of mixer. The pipe mixer 2 can be made of 316 stainless steel, with a length-to-diameter ratio of 10-20, and also has a side inlet.

[0037] In some embodiments of this application, the pipeline mixer 2 automatically mixes and dissolves crude oil and carbon dioxide in proportion, and then the flow rate is automatically controlled to enter the dehydration tower 3. The crude oil pipeline is equipped with a one-way valve to control the start and stop of the flushing with clean water.

[0038] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the dehydration tower 3 is a two-section packed vertical tower. The dehydration tower 3 is equipped with a first upper inspection hole, a first middle inspection hole, and a first lower inspection hole. The first middle inspection hole is located between the floating oil packing 32 and the submerged water packing 34. The first upper inspection hole is located above the floating oil packing 32, and the first lower inspection hole is located below the submerged water packing 34. The submerged water packing 34 is Pall ring packing. This structure makes maintenance of the dehydration tower 3 more convenient.

[0039] In some embodiments of this application, the floating oil packing 32 can be 250Y stainless steel structured packing with a height-to-diameter ratio of 8 to 10.

[0040] In some embodiments of this application, the diameter of the oil spill outlet 33 is equal to the diameter of the feed inlet 31, and the submerged packing 34 is a DN50 Pall ring packing made of 316 stainless steel with a height-to-diameter ratio of 8 to 10.

[0041] In some embodiments of this application, the drain outlet 35 is located at the bottom of the dehydration tower 3, with a diameter of 1.5 to 2 times that of the feed inlet 31, and is equipped with an anti-vortex upper baffle; the oil return outlet 36 is located below the floating oil packing 32 in the middle of the tower and above the feed inlet 31, with a diameter equal to that of the feed inlet 31; the tower diameter is calculated based on the processing volume, and the hydraulic retention time is 2 to 4 hours.

[0042] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the degassing tower 6 is a two-section packed vertical tower. The degassing tower 6 is equipped with a second upper inspection hole, a second middle inspection hole, and a second lower inspection hole. The second middle inspection hole is located between the demister packing 62 and the degassing packing 65. The second upper inspection hole is located above the demister packing 62, and the second lower inspection hole is located below the degassing packing 65. The degassing packing 65 is Pall ring packing. This structure makes maintenance of the degassing tower 6 more convenient.

[0043] In some embodiments of this application, the defoaming packing 62 is 250Y stainless steel structured packing with a height-to-diameter ratio of 8-10. The vent 63 is located on the upper side of the degassing tower 6, and its diameter is equal to that of the floating oil inlet 61. The safety vent 64 has a diameter twice that of the floating oil inlet 61. The degassing packing 65 is DN50 Pall ring packing made of 316 stainless steel with a height-to-diameter ratio of 8-10. The oil drain 66 has a diameter 1.5-2 times that of the floating oil inlet 61 and is equipped with an anti-vortex upper baffle. The diameter of the degassing tower 6 is calculated based on the processing volume, and the hydraulic retention time is 2-4 hours.

[0044] In some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3As shown, the carbon dioxide flotation oil extraction equipment also includes a crude oil pipeline and a flushing pipeline. One end of the crude oil pipeline is used to input crude oil, and the other end is connected to the second inlet end. One end of the flushing pipeline is used to input flushing water, and the other end is connected to the crude oil pipeline. The inlet end of the dehydration tower bottom pump 4 is connected to the outlet 35. The inlet end of the dehydration tower bottom pump 4 is connected to an outlet pipe, which is simultaneously connected to a first branch pipe and a second branch pipe. The first branch pipe is used to transport water to the outside, and the second branch pipe is connected to the flushing pipeline. With this structure, the flushing water can enter the crude oil pipeline, the pipeline mixer 2, and the dehydration tower 3 through the flushing pipeline for cleaning. Furthermore, after the water in the dehydration tower 3 is discharged through the outlet 35, the dehydration tower bottom pump 4 can pump the water into the flushing pipeline for circulating flushing.

[0045] In some embodiments of this application, the bottom pump 4 of the dehydration tower is a self-priming chemical centrifugal pump. Self-priming chemical centrifugal pumps are a common type of centrifugal pump. The self-priming chemical centrifugal pump is equipped with a pipeline filter, its inlet is connected to the drain outlet 35 of the dehydration tower 3, and its outlet has a flow control valve, followed by self-circulation and discharge branches.

[0046] In some embodiments of this application, such as Figure 1 and Figure 3 As shown, the carbon dioxide flotation oil extraction equipment also includes a level gauge 67, which is fixed to the degassing tower 6. The oil outlet of the bottom pump 7 of the degassing tower is connected to an oil outlet pipe, which is simultaneously connected to a first pipe, a second pipe, and a third pipe. The first pipe is connected to the level gauge 67, the second pipe is used to output oil to the outside, and the third pipe is connected to the return port 36. With this structure, the oil level can be observed through the level gauge 67, oil can be output to the outside through the second pipe, and the bottom pump 7 of the degassing tower can pump oil into the dehydration tower 3 through the third pipe.

[0047] In some embodiments of this application, the level gauge 67 is located on the lower side of the degassing tower 6 and below the degassing packing 65. The level gauge 67 can be a remote magnetic float explosion-proof level gauge.

[0048] In some embodiments of this application, the level gauge 67 of the degassing tower 6 can detect the liquid level to achieve high-level alarm and low-level alarm for the self-balancing control of the entire equipment.

[0049] In some embodiments of this application, the bottom pump 7 of the degassing tower is a self-priming chemical centrifugal pump. Self-priming chemical centrifugal pumps are a common type of centrifugal pump. The self-priming chemical centrifugal pump is equipped with a pipeline filter, its inlet is connected to the oil outlet 66 of the degassing tower 6, and its outlet has a self-regulating valve controlled by a level gauge 67. Following this are self-circulation and discharge branches, with the self-circulation branch connecting to the oil return port 36 of the dehydration tower 3.

[0050] In some embodiments of this application, the overall equipment is electrostatically bonded, and the lightning and electrostatic grounding and neutral point safety grounding comply with electrical instrumentation safety specifications; the main body material and wall thickness meet the requirements for corrosion resistance and pressure rating, and the insulation and heat tracing meet the requirements for protection against extreme temperatures in the operating environment.

[0051] In some embodiments of this application, when the equipment is started, crude oil and carbon dioxide enter the pipeline mixer 2 in proportion to mix and dissolve, and the pressurized flow rate is automatically controlled, gradually filling the entire dehydration tower 3; the bottom pump 4 of the dehydration tower is started, and the flow rate is automatically controlled to circulate through the pipeline mixer 2. After sampling and testing to ensure that the oil content in the water meets the standard, the external discharge branch is gradually opened, and the flow rate is automatically controlled to drain the water; during normal operation, the self-circulation ratio can be gradually reduced, and all the water is discharged; the floating oil enters the heat exchanger 5 from the floating oil outlet 33 for heating.

[0052] After being heated by heat exchanger 5, the oil viscosity significantly decreases, the foam bubble layer becomes more fragile, and the gas expands due to heat, resulting in easier degassing. The oil then enters the degassing tower 6 through the floating oil inlet 61 and is sprayed downwards onto the degassing packing 65. The degassing packing 65 provides a large evaporation area and a tortuous falling path, extending the evaporation time and ensuring thorough degassing of the liquid falling into the monitoring area of ​​the level gauge 67. Gas mist entrains suspended bubbles, which rise through the defoaming packing 62, and clean gas exits the equipment from the exhaust port 63. In case of special overpressure, the mechanical safety valve at the top safety vent 64 opens, releasing the gas into the flare system. The foam gradually accumulates, and after releasing the gas, it defoams into liquid, dripping downwards as dry oil. The exhaust gas is then fed into the oil and gas treatment system to recover condensate oil and natural gas.

[0053] The degassed oil exits from the bottom drain port 66 and is pumped by the bottom pump 7 of the degassing tower. In the initial stage when the tower is cold and equilibrium has not been established, all of it is returned to the return port 36 of the dehydration tower 3 for recirculation. It is gradually changed to discharge from the tower and discharged from the equipment once the tower temperature rises, equilibrium is established, and dehydration meets the standards.

[0054] In normal operation, to achieve the highest working efficiency of this utility model, the self-circulation is turned off, and the liquid level gauge 67 automatically controls the balancing operation.

[0055] When completely shutting down, stop feeding, close carbon dioxide cylinder 1, and use flushing water instead of feed to process all the material remaining in the equipment and fully recover the oil. Then, close the degassing tower bottom pump 7 and drain the degassing tower 6 at a low level; after the drain is clean and free of oil, open the dehydration tower bottom pump 4 to drain the water from the dehydration tower 3; after the external drainage is free of oil, close the flushing water, drain the water from the dehydration tower 3 completely, and close the dehydration tower bottom pump 4. Then, purge with nitrogen to remove any remaining water and seal for later use. If nitrogen is insufficient, use carbon dioxide to dry the equipment, ensuring the purge gas vent prevents suffocation. The discharged residual water enters the water treatment system and must not be discharged without proper organization.

[0056] In winter, this invention should be strictly protected against freezing and blockage, and freezing and cracking.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A carbon dioxide flotation oil extraction device, characterized in that, This includes carbon dioxide cylinders, pipeline mixers, dehydration towers, dehydration tower bottom pumps, degassing towers, and degassing tower bottom pumps; The pipeline mixer includes a first inlet end, a second inlet end, and an outlet end. The dehydration tower includes a feed inlet, a floating oil outlet, a drain outlet, and a return oil outlet. The dehydration tower is equipped with floating oil packing and submerged water packing. The floating oil outlet and the drain outlet are located at the upper and lower ends of the dehydration tower, respectively. The floating oil packing is disposed on the upper side of the submerged water packing. The feed inlet and the return oil outlet are both located between the floating oil packing and the submerged water packing. The first inlet end is connected to the carbon dioxide cylinder. The second inlet end is used to introduce crude oil. The outlet end is connected to the feed inlet. The degassing tower includes an oil inlet, a safety vent, an exhaust port, and an oil outlet. The degassing tower is equipped with defoaming packing and degassing packing. The safety vent and the oil outlet are located at the upper and lower ends of the degassing tower, respectively. The defoaming packing is located on the upper side of the degassing packing. The oil inlet is located between the defoaming packing and the degassing packing. The exhaust port is located above the defoaming packing. The floating oil inlet and the floating oil outlet are connected, the dehydration tower bottom pump and the drain outlet are connected, the oil inlet of the degassing tower bottom pump and the oil outlet are connected, and the oil outlet is connected to the return oil port.

2. The carbon dioxide flotation oil extraction equipment according to claim 1, characterized in that, It also includes a heat exchanger, one end of which is connected to the floating oil inlet and the other end of which is connected to the floating oil outlet.

3. The carbon dioxide flotation oil extraction equipment according to claim 2, characterized in that, The heat exchanger is a shell-and-tube heat exchanger.

4. The carbon dioxide flotation oil extraction equipment according to claim 1, characterized in that, The pipeline mixer is a static spiral vane mixer.

5. The carbon dioxide flotation oil extraction equipment according to claim 1, characterized in that, The dehydration tower is a two-section packed vertical tower. The dehydration tower is provided with a first upper inspection hole, a first middle inspection hole and a first lower inspection hole. The first middle inspection hole is located between the floating oil packing and the submerged water packing. The first upper inspection hole is located above the floating oil packing and the first lower inspection hole is located below the submerged water packing. The submersible packing material is a Pall ring packing material.

6. The carbon dioxide flotation oil extraction equipment according to claim 5, characterized in that, The degassing tower is a two-section packed vertical tower. The degassing tower is provided with a second upper inspection hole, a second middle inspection hole and a second lower inspection hole. The second middle inspection hole is located between the defoaming packing and the degassing packing. The second upper inspection hole is located above the defoaming packing and the second lower inspection hole is located below the degassing packing. The degassing packing is a Pall ring packing.

7. The carbon dioxide flotation oil extraction equipment according to claim 6, characterized in that, It also includes a crude oil pipeline and a flushing pipeline. One end of the crude oil pipeline is used to input crude oil, and the other end is connected to the second inlet end. One end of the flushing pipeline is used to input flushing water, and the other end is connected to the crude oil pipeline. The inlet of the dehydration tower bottom pump is connected to the outlet. The inlet of the dehydration tower bottom pump is connected to an outlet pipe. The outlet pipe is connected to a first branch pipe and a second branch pipe. The first branch pipe is used to transport water to the outside, and the second branch pipe is connected to the flushing pipeline.

8. The carbon dioxide flotation oil extraction equipment according to claim 7, characterized in that, The dehydration tower bottom pump is a self-priming chemical centrifugal pump.

9. The carbon dioxide flotation oil extraction equipment according to claim 6, characterized in that, It also includes a level gauge, which is fixed on the degassing tower. The oil outlet end of the bottom pump of the degassing tower is connected to an oil outlet pipe. The oil outlet pipe is connected to a first pipe, a second pipe, and a third pipe. The first pipe is connected to the level gauge, the second pipe is used to output oil to the outside, and the third pipe is connected to the oil return port.

10. The carbon dioxide flotation oil extraction equipment according to claim 9, characterized in that, The degassing tower bottom pump is a self-priming chemical centrifugal pump.

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