A natural gas produced water oil removal and sedimentation treatment device

Abstract

This invention discloses a natural gas produced water oil removal and settling treatment device, comprising: a settling tank, the settling tank having an oil removal mechanism inside, the oil removal mechanism including a cover plate, a threaded rod and a rotating motor, and an oil scraping mechanism and an air flotation mechanism on the outside of the threaded rod, both of which are connected to the threaded rod via a connecting mechanism; the air flotation mechanism injects and pressurizes the liquid, then allows air to dissolve in the water, forming an air supersaturated state, and then reduces the pressure to normal to allow the air to precipitate out as tiny bubbles released into the water to achieve air flotation; then the oil scraping mechanism scrapes away the surface oil stains, and with the help of a circular bag, pushes the oil stains into the circular bag for easy removal later, thus achieving oil removal from the water; and the connecting mechanism is used to fix and limit the water with a limiting rod, thereby adjusting the height according to the water and oil levels and increasing work efficiency.

Description

Technical Field

[0001] This invention relates to the field of natural gas equipment technology, specifically to a natural gas produced water oil removal and sedimentation treatment device. Background Technology

[0002] During natural gas extraction, both onshore and offshore gas fields generate a large amount of produced water. This produced water is one of the main pollutants in the natural gas extraction process. Its composition is complex, with key characteristics including high oil content and high emulsification. It also contains suspended solids, sulfides, sulfate-reducing bacteria (SRB), and high concentrations of salt. If discharged or reinjected directly without effective treatment, it will not only cause serious environmental pollution but also corrode pipelines and equipment, clog formation pores, and affect gas field extraction efficiency and safe production. Among these pollutants, oil pollutants mainly exist in three forms: floating oil, dispersed oil, and emulsified oil. Emulsified oil, in particular, forms a stable oil-water emulsion system in produced water, making it difficult to remove through conventional gravity sedimentation methods, thus becoming a key challenge in the natural gas produced water treatment process. Currently, in the treatment of oil removal from natural gas produced water, air flotation oil removal technology has become one of the most widely used core processes due to its high treatment efficiency and strong adaptability. Its core principle is to introduce microbubbles into oily wastewater, and use the adsorption effect between the bubbles and oil droplets to carry the oil droplets to the surface of the water, thereby achieving oil-water separation and thus achieving the purpose of oil removal. Traditional oil removal processes require controlling and adjusting the height of the air flotation oil removal process, as well as cleaning the oil stains on the water surface. This usually requires multiple people to work together, resulting in low efficiency. Furthermore, the varying water level heights during the oil removal process necessitate repeated adjustments, increasing the difficulty of the task. In addition, maintaining the integrity of the oil removal process requires multiple adjustments to the bubble position, further complicating the work. Summary of the Invention

[0003] The purpose of this invention is to provide a natural gas produced water oil removal and sedimentation treatment device to solve the problems mentioned in the background art.

[0004] By adopting the above technical solution, it is possible to perform oil removal work according to different amounts of impurity liquid, and to provide scraping protection.

[0005] Compared with the prior art, the beneficial effects of the present invention are as follows: the air flotation mechanism injects and pressurizes the liquid, then allows air to dissolve in the water to form an air supersaturated state, and then reduces the pressure to normal to allow the air to precipitate out and be released into the water as microbubbles to achieve air flotation. Then, the oil stains on the surface are scraped off by the oil scraping mechanism, and with the help of the ring bag, the oil stains are pushed into the ring bag for easy removal later, thus achieving oil removal from water. Furthermore, the connecting mechanism achieves fixed limitation with the limiting rod, so that the height can be adjusted according to the water and oil level, thereby increasing work efficiency. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the oil scraping mechanism and the air flotation mechanism in this invention; Figure 4 This is an enlarged structural schematic diagram of the air flotation mechanism in this invention.

[0007] In the diagram: 1. Settling tank; 2. Oil removal mechanism; 201. Cover plate; 202. Threaded rod; 203. Rotary motor; 204. Threaded rod; 205. Limiting rod; 3. Oil scraping mechanism; 301. Oil scraping block; 302. Oil scraping motor; 303. Oil scraping rod; 304. Oil scraping block; 305. Scraper; 4. Air flotation mechanism; 401. Air flotation block; 402. Air flotation rod; 5. Connecting mechanism; 501. Lifting block; 502. Storage hole; 503. Storage ring; 504. Connector; 505. Positioning component; 506. Positioning hole; 507. Slide groove; 6. Circular bag; 7. Insertion rod. Detailed Implementation

[0008] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0009] Please see Figure 1-4 This invention provides a technical solution: a natural gas produced water oil removal and settling treatment device, comprising: a settling tank 1, an oil removal mechanism 2 inside the settling tank 1, the oil removal mechanism 2 including a cover plate 201, a threaded rod 202 and a rotating motor 203, an oil scraping mechanism 3 and an air flotation mechanism 4 on the outside of the threaded rod 202, the air flotation mechanism 4 and the oil scraping mechanism 3 being connected to the threaded rod 202 by a connecting mechanism 5; the cover plate 201 is detachable, the oil scraping mechanism 3 scrapes and removes oil stains on the surface of the water, and the air flotation mechanism 4 pressurizes and injects air bubbles to make the oil stains float on the surface for easy removal.

[0010] A rotary motor 203 is fixedly connected to the lower surface of the cover plate 201. The output shaft of the rotary motor 203 is fixedly connected to a mounting plate 204. A threaded rod 202 and a sliding connection limiting rod 205 are fixedly connected to the bottom end of the mounting plate 204. The limiting rod 205 passes through the mounting plate 204. The connecting mechanism 5 includes a lifting block 501, a storage hole 502, a storage ring 503, and a connecting piece 504. The outer wall of the threaded rod 202 is threadedly connected to the lifting block 501. A storage hole 502 is opened on the outer side of the lifting block 501, and a sliding connection is slidably connected inside the storage hole 502. The storage ring 503 is slidably connected to two other storage rings 503 by a connector 504. A positioning member 505 is fixedly connected to the outer side of the storage ring 503. Several positioning holes 506 are opened on the outer side of the limiting rod 205. The positioning member 505 and the positioning holes 506 are adapted to each other. The size change is completed by the extension of the storage ring 503 driving the connector 504 to cooperate. Then, the positioning member 505 contacts and is fixed with the positioning hole 506 to complete the limiting work and realize the position movement. When the limiting rod 205 is fixed with the positioning member 505, the rotation makes the limiting rod 205 move up and down synchronously.

[0011] A slide groove 507 is provided above the lifting block 501. The air flotation mechanism 4 includes an air flotation block 401 and an air flotation rod 402. The slide groove 507 is provided with an air flotation block 401 and an oil scraper block 301 respectively. The output end of the air flotation block 401 is fixedly connected to the air flotation rod 402, and the air flotation rod 402 realizes the pressurization work.

[0012] The oil scraping mechanism 3 includes an oil scraping block 301, an oil scraping motor 302, an oil scraping rod 303, an oil scraping block 304, and a scraper 305. The oil scraping motor 302 is fixedly connected inside the oil scraping block 301. The output shaft of the oil scraping motor 302 is fixedly connected to the oil scraping rod 303. The oil scraping block 304 is threadedly connected to the outer wall of the oil scraping rod 303. The scraper 305 is fixedly connected to one end of the oil scraping block 304. A circular bag 6 is fixedly connected to the top of the oil scraping rod 303. An inserting rod 7 is fixedly connected between the oil scraping block 301 and the circular bag 6. The inserting rod 7 passes through the oil scraping block 304. The scraper 305 pushes the oil stains on the surface into the circular bag 6 for collection, which is convenient for later cleaning.

Claims

1. A natural gas produced water deoiling and settling treatment apparatus, characterized by: include: Settling tank (1) is equipped with an oil removal mechanism (2) inside the settling tank (1). The oil removal mechanism (2) includes a cover plate (201), a threaded rod (202) and a rotating motor (203). An oil scraping mechanism (3) and an air flotation mechanism (4) are provided on the outside of the threaded rod (202). The air flotation mechanism (4) and the oil scraping mechanism (3) are both connected to the threaded rod (202) through a connecting mechanism (5).

2. The natural gas produced water deoiling and settling treatment apparatus of claim 1, wherein: A rotating motor (203) is fixedly connected to the lower surface of the cover plate (201). The output shaft of the rotating motor (203) is fixedly connected to a mounting plate (204). A threaded rod (202) and a sliding connection limiting rod (205) are fixedly connected to the bottom end of the mounting plate (204). The limiting rod (205) passes through the mounting plate (204). The connecting mechanism (5) includes a lifting block (501), a storage hole (502), a storage ring (503), and a connector (504). The threaded rod (202) is fixedly connected to the bottom end of the mounting plate (204). 02) has a lifting block (501) threadedly connected to the outer wall. The lifting block (501) has a storage hole (502) on its outer side. A storage ring (503) is slidably connected inside the storage hole (502). A connector (504) is slidably connected between the two storage rings (503). A positioning member (505) is fixedly connected to the outer side of the storage ring (503). Several positioning holes (506) are opened on the outer side of the limiting rod (205). The positioning member (505) and the positioning holes (506) are compatible.

3. The natural gas produced water deoiling and settling treatment apparatus of claim 1, wherein: The lifting block (501) is provided with a slide groove (507) above it. The air flotation mechanism (4) includes an air flotation block (401) and an air flotation rod (402). The slide groove (507) is provided with an air flotation block (401) and an oil scraper block (301) respectively. The output end of the air flotation block (401) is fixedly connected to the air flotation rod (402).

4. The natural gas produced water deoiling and settling treatment apparatus of claim 3, wherein: The oil scraping mechanism (3) includes an oil scraping block (301), an oil scraping motor (302), an oil scraping rod (303), an oil scraping block (304), and a scraper (305). The oil scraping motor (302) is fixedly connected inside the oil scraping block (301). The output shaft of the oil scraping motor (302) is fixedly connected to the oil scraping rod (303). The oil scraping block (304) is threadedly connected to the outer side wall of the oil scraping rod (303). The scraper (305) is fixedly connected to one end of the oil scraping block (304).

5. A natural gas produced water deoiling and settling treatment apparatus as defined in claim 4, wherein: The top end of the oil scraper (303) is fixedly connected to a circular bag (6), and an insert rod (7) is fixedly connected between the oil scraper block (301) and the circular bag (6), and the insert rod (7) passes through the oil scraper block (304).

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