A downcomer for the sedimentation and oil purification chamber of an oil and gas water treatment device

Abstract

The present invention relates to the technical field of oilfield oil and gas water treatment. Specifically, it is a downcomer for the sedimentation and oil purification chamber of an oil and gas water treatment device. In order to solve the problem of improving the efficiency of crude oil dehydration, the present invention provides a downcomer for the sedimentation and oil purification chamber of an oil and gas water treatment device, which includes a first tank and a second tank. The first tank is arranged above the second tank. An oil-gas-water separation chamber is provided in the first tank. In the second tank, there are a sedimentation and water purification chamber, a sedimentation and oil purification chamber, and an AC / DC electro-dehydration chamber that are not connected to each other. The first tank and the second tank are connected by a downcomer. Both ends of the downcomer communicate with the oil-gas-water separation chamber and the sedimentation and oil purification chamber. By evenly arranging air flotation ports on the annular pipe wall of the downcomer in the sedimentation and oil purification chamber, and spraying the demulsifier into the downcomer through small holes, the emulsified crude oil and the demulsifier are evenly and fully mixed in this space, greatly improving the efficiency of crude oil dehydration.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield oil and gas water treatment, and specifically relates to a downcomer for a sedimentation and oil purification chamber of an oil and gas water treatment device. Background Art

[0002] In existing oilfield treatment technologies, the separation of oil, gas, and water often consumes a large amount of energy. Generally, after being treated by an oil and gas water treatment device, the separation of oil, gas, and water is not sufficient, and further water treatment steps are required, resulting in large energy consumption. Therefore, it is necessary to further improve the oil and gas water treatment device. Currently, most of the commonly used oil and gas water treatment devices in oilfield production are single-layer structures, and only a few double-layer devices simply separate two independent containers into upper and lower layers through an intermediate platform. After being treated in the upper container, the oil, gas, and water are transported to the lower container through a main outlet pipe for further treatment. In the upper structure of the device, the oil, gas, and water separation chamber first performs three-phase separation of oil, gas, and water. The crude oil enters the emulsified oil chamber through an overflow weir plate. The crude oil in this chamber is water-in-oil emulsified crude oil. In order to directly export the purified crude oil out of the device, further dehydration of the crude oil is required. However, the traditional oil and gas water treatment device is not sufficient to perform effective oil-water separation, and cannot ensure the purpose of directly exporting the purified crude oil out of the device. Summary of the Invention

[0003] In order to solve the problem of improving the efficiency of crude oil dehydration, the present invention provides an oil and gas water treatment device with an upper and lower double-layer structure and a downcomer for connecting the sedimentation and oil purification chambers of the upper and lower tanks.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A downcomer for a sedimentation and oil purification chamber of an oil and gas water treatment device, comprising a first tank and a second tank. The first tank is arranged above the second tank. An oil, gas, and water separation chamber is provided in the first tank. A sedimentation and water purification chamber, a sedimentation and oil purification chamber, and an AC / DC electro-dehydration chamber that do not communicate with each other are provided in the second tank. The first tank and the second tank are connected by a downcomer, and both ends of the downcomer communicate with the oil, gas, and water separation chamber and the sedimentation and oil purification chamber.

[0005] As an optimization, the downcomer includes an upper connecting pipe, a lower connecting pipe, a metal hose, and a flotation port. The upper connecting pipe communicates with the upper end and is connected to the first tank. The lower end of the upper connecting pipe is connected to the metal hose. The lower end of the metal hose is connected to the flotation port. The lower end of the flotation port is connected to the lower connecting pipe. The lower end of the lower connecting pipe is connected to the second tank.

[0006] As an optimization, the flotation port includes an outer circular pipe. An injector is provided inside the outer circular pipe. The injector is connected to the outer circular pipe through a plurality of capillary tubes. A demulsifier input pipe is also connected to the outer circular pipe. The capillary tubes communicate the outer circular pipe with the injector. The upper end of the injector is connected to the metal hose, and the lower end of the injector is connected to the lower connecting pipe.

[0007] As an optimization, the metal hose is a bellows compensator.

[0008] As an optimization, the outer circular tube includes a first outer circular tube and a second outer circular tube, and the first outer circular tube and the second outer circular tube are connected by a flange at the end.

[0009] As an optimization, for the liquid downcomer of the sedimentation and oil purification chamber of the oil and gas water treatment equipment, it is characterized in that: the capillary tubes are evenly distributed along the inner circumference of the outer circular tube.

[0010] The beneficial effects of this solution are as follows: The present invention is provided with upper and lower treatment tanks, capable of performing two-step treatment. The liquid downcomer structure can connect the oil-gas-water separation chamber and the sedimentation and oil purification chamber, and can achieve pressure balance in the upper and lower chambers of the entire device; the emulsified crude oil separated from the upper oil-gas-water separation chamber flows by gravity through the liquid downcomer into the sedimentation and oil purification chamber of the lower structure. During the deep dehydration process of the crude oil, a demulsifier needs to be added. By evenly arranging multiple small holes (air flotation ports) on the annular tube wall of the liquid downcomer in the sedimentation and oil purification chamber, the demulsifier is sprayed into the liquid downcomer through the small holes, so that the emulsified crude oil and the demulsifier are evenly and fully mixed in this space, greatly improving the efficiency of crude oil dehydration; in addition, to facilitate the docking and installation of the upper and lower chambers, reduce the influence of displacement such as vibration and thermal expansion, and improve the sealing reliability of the connection part, the liquid downcomer adopts a metal hose structure; the liquid downcomer is set to facilitate the disassembly of the upper and lower chambers, which is beneficial for separate transportation, and is convenient for on-site assembly, without welding, and can be directly flange-connected, shortening the construction period and being simple to maintain; after the present invention connects the upper emulsified oil chamber and the lower sedimentation and oil purification chamber through the liquid downcomer of the sedimentation and oil purification chamber, the upper emulsified crude oil can flow by gravity into the lower chamber using the potential difference. During the deep dehydration process of the crude oil, a demulsifier needs to be added. The demulsifier is sprayed into the liquid downcomer through the air flotation ports on the annular tube wall of the liquid downcomer in the sedimentation and oil purification chamber, so that the emulsified crude oil and the demulsifier are evenly and fully mixed in this space, greatly improving the efficiency of crude oil dehydration, shortening the crude oil treatment process, saving the energy consumption of crude oil treatment, and reducing the treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 is the overall structural schematic diagram of the present invention.

[0012] Attached Figure 2 is the structural schematic diagram of the liquid downcomer of the present invention.

[0013] Attached Figure 3 is the structural schematic diagram of the air flotation port of the present invention.

[0014] Among them, 1. First tank body, 2. Second tank body, 3. Oil-gas-water separation chamber, 4. Settling water purification chamber, 5. Settling oil purification chamber, 6. AC / DC electric desalting chamber, 7. Downcomer, 8. Upper connecting pipe, 9. Lower connecting pipe, 10. Metal hose, 11. Air flotation port, 12. Outer circular pipe, 13. Injector, 14. Capillary tube, 15. First outer circular pipe, 16. Second outer circular pipe, 17. Flange, 18. Demulsifier input pipe. Specific embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0016] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0018] As Figure 1 shown in the embodiment, a downcomer for the settling oil purification chamber of an oil-gas-water treatment device includes a first tank body 1 and a second tank body 2. The first tank body 1 is disposed above the second tank body 2. An oil-gas-water separation chamber 3 is provided in the first tank body 1. A settling water purification chamber 4, a settling oil purification chamber 5, and an AC / DC electric desalting chamber 6 that do not communicate with each other are provided in the second tank body 2. The first tank body 1 and the second tank body 2 are connected by a downcomer 7. Both ends of the downcomer 7 communicate with the oil-gas-water separation chamber 3 and the settling oil purification chamber 5.

[0019] The downcomer 7 includes an upper connecting pipe 8, a lower connecting pipe 9, a metal hose 10 and a flotation port 11. The upper connecting pipe 8 communicates with the upper end to connect the first tank 1. The lower end of the upper connecting pipe 8 is connected to the metal hose 10. The lower end of the metal hose 10 is connected to the flotation port 11. The lower end of the flotation port 11 is connected to the lower connecting pipe 9. The lower end of the lower connecting pipe 9 is connected to the second tank 2.

[0020] The flotation port 11 includes an outer circular pipe 12. An injector 13 is arranged inside the outer circular pipe 12. The injector 13 is connected to the outer circular pipe 12 through a plurality of capillary tubes 14. A demulsifier input pipe 18 is also connected to the outer circular pipe 12. The capillary tubes 14 communicate the outer circular pipe 12 with the injector 13. The upper end of the injector 13 is connected to the metal hose 10, and the lower end of the injector 13 is connected to the lower connecting pipe 9.

[0021] The metal hose 10 is a bellows compensator.

[0022] The outer circular pipe 12 includes a first outer circular pipe 15 and a second outer circular pipe 16. The first outer circular pipe 15 and the second outer circular pipe 16 are connected by a flange 17 at the end.

[0023] For the downcomer 7 of the sedimentation and oil purification chamber 5 of an oil-gas-water treatment device, the capillary tubes 14 are uniformly distributed along the inner circumference of the outer circular pipe 12.

[0024] Working principle: The oil-gas-water mixture is first separated into oil, gas and water phases in the oil-gas-water separation chamber. The separated emulsified crude oil flows by gravity through the downcomer into the sedimentation and oil purification chamber by potential difference. During the process of the emulsified crude oil flowing through the downcomer, the demulsifier is sprayed into the downcomer through the flotation port of the downcomer in the sedimentation and oil purification chamber, and is uniformly and fully mixed with the emulsified crude oil. Then the mixture flows to the sedimentation and oil purification chamber of the lower structure, and the emulsified crude oil is further dehydrated in the sedimentation and oil purification chamber to reduce the water content of the crude oil. The low-water-content crude oil enters the AC / DC electro-dehydration chamber for dehydration treatment to become qualified purified crude oil.

[0025] The above specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product forms and styles of the above specific embodiments. Any downcomer of the sedimentation and oil purification chamber of an oil-gas-water treatment device that meets the claims of the present invention and any appropriate changes or modifications made by those of ordinary skill in the relevant technical field shall fall within the patent protection scope of the present invention.

Claims

1. A liquid downcomer for a sedimentation and oil purification chamber of an oil and gas water treatment device, characterized in that: It includes a first tank body and a second tank body. The first tank body is arranged above the second tank body. An oil-gas-water separation chamber is provided in the first tank body. In the second tank body, there are a sedimentation and purification water chamber, a sedimentation and purification oil chamber and an AC / DC electro-degumming chamber that do not communicate with each other. The first tank body and the second tank body are connected by a downcomer. Both ends of the downcomer communicate with the oil-gas-water separation chamber and the sedimentation and purification oil chamber. The downcomer includes an upper connecting pipe, a lower connecting pipe, a metal hose and an air flotation port. The upper connecting pipe communicates with and is connected to the first tank body at the upper end. The lower end of the upper connecting pipe is connected to the metal hose. The lower end of the metal hose is connected to the air flotation port. The lower end of the air flotation port is connected to the lower connecting pipe. The lower end of the lower connecting pipe is connected to the second tank body. The air flotation port includes an outer circular pipe. An injector is provided in the outer circular pipe. The injector is connected to the outer circular pipe through a plurality of capillary tubes. A demulsifier input pipe is also connected to the outer circular pipe. The capillary tubes communicate the outer circular pipe with the injector. The upper end of the injector is connected to the metal hose, and the lower end of the injector is connected to the lower connecting pipe.

2. The downcomer of the sedimentation and oil purification chamber of the oil and gas water treatment equipment according to claim 1, characterized in that: The metal hose is a bellows compensator.

3. A downcomer for a sedimentation and oil purification chamber of an oil and gas water treatment device according to claim 1, characterized in that: The outer circular pipe includes a first outer circular pipe and a second outer circular pipe. The first outer circular pipe and the second outer circular pipe are connected by a flange at the end.

4. The downcomer of the sedimentation and oil purification chamber of the oil and gas water treatment equipment according to claim 1, characterized in that: The capillary tubes are evenly distributed along the inner circumference of the outer circular pipe.

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