Horizontal oilfield sewage treatment device

Abstract

The utility model discloses a horizontal oilfield sewage treatment device, specifically related to sewage treatment device technical field, including horizontal vessel, the inside from left to right through multiple baffle of horizontal vessel is separated with gas -liquid separation area, liquid -liquid cyclone oil removal area, inclined plate coalescence area and horizontal filter area in proper order, the inside fixedly installed with baffle and gas -liquid separator of gas -liquid separation area, the gas -liquid separator top penetrates horizontal vessel and extends to the outside of horizontal vessel. The utility model discloses through with gas -liquid separation, liquid -liquid cyclone oil removal, inclined plate coalescence, horizontal filter material filtration etc. Variety of processing functions are integrated in a horizontal vessel, compared with traditional multistage equipment combination, the equipment land area is reduced significantly, the oilfield sewage treatment site space is greatly saved, and the integrated structure design reduces the connecting pipeline between equipment, reduces the pipeline leakage risk, makes equipment operation more stable, and maintenance is more convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage treatment devices, and more specifically to a horizontal oilfield sewage treatment device. Background Technology

[0002] In oilfield extraction operations, after the produced fluid undergoes preliminary separation by a three-phase separator, a large amount of oil and suspended solids remain, requiring further treatment to meet water injection standards. Traditional wastewater treatment equipment often employs a combination of multi-stage separation and filtration devices. For example, an oilfield wastewater treatment device with prior art publication number CN214990648U first uses a single-stage inclined plate oil separator for preliminary oil removal, followed by a single-stage media filter for deep filtration.

[0003] However, this treatment method has many drawbacks: the equipment occupies too much space, the connecting pipes between devices are complex, energy consumption is high, maintenance costs are high, and treatment efficiency is low. Furthermore, when multiple stages of equipment are connected in series, a failure in any one stage can bring the entire wastewater treatment process to a standstill. Therefore, developing a wastewater treatment device that is compact, has excellent treatment performance, occupies a small area, and can meet stringent water injection standards has become an urgent need in the field of oilfield wastewater treatment. Utility Model Content

[0004] To overcome the aforementioned deficiencies of the prior art, this utility model provides a horizontal oilfield wastewater treatment device. By integrating multiple treatment functions such as gas-liquid separation, liquid-liquid cyclone oil removal, inclined plate coalescence, and horizontal filter media filtration into a single horizontal container, this device significantly reduces the floor space required for equipment compared to traditional multi-stage equipment combinations, greatly saving space in oilfield wastewater treatment sites. Furthermore, the integrated structural design reduces the number of connecting pipes between devices, lowers the risk of pipe leakage, and makes the equipment more stable in operation and easier to maintain, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a horizontal oilfield wastewater treatment device, comprising a horizontal container, wherein the interior of the horizontal container is sequentially divided from left to right by multiple partitions into a gas-liquid separation zone, a liquid-liquid cyclone oil removal zone, an inclined plate coalescing zone, and a horizontal filtration zone. The gas-liquid separation zone is fixedly equipped with baffles and a gas-liquid separator, the top of which penetrates the horizontal container and extends to the outside of the container. The liquid-liquid cyclone oil removal zone is fixedly equipped with an oil removal cyclone separator and an air chamber. The inclined plate coalescing zone includes a wastewater buffer chamber, a wastewater coalescing chamber, and a wastewater settling chamber. The wastewater coalescing chamber is fixedly equipped with a coalescing packing assembly. The horizontal filtration zone includes a filter inlet chamber, filter media, and a filter outlet chamber distributed from top to bottom.

[0006] In a preferred embodiment, the gas-liquid separation zone is connected to the interior of the gas tank via a first manual valve, and a wastewater inlet of a three-phase separator is connected to one side of the gas-liquid separator. The gas-liquid separation zone includes an inertial separation zone and an oil removal cyclone inlet zone, and the oil removal cyclone is connected to the interior of the gas-liquid separation zone via a liquid distributor.

[0007] In a preferred embodiment, the liquid-liquid cyclone oil removal zone includes a cyclone oil outlet chamber, a cyclone water outlet chamber, a wastewater recovery chamber, and a recovery oil chamber. The oil removal cyclone is located between the cyclone oil outlet chamber and the cyclone water outlet chamber, and an exhaust port is fixedly provided on the top of the air chamber.

[0008] In a preferred embodiment, a water distribution assembly is fixedly installed inside the filter inlet chamber, and a water collection assembly is fixedly installed inside the filter outlet chamber. The water collection assembly is connected to a clean water outlet, which extends out of the outside of the horizontal container to facilitate the collection of filtered clean water.

[0009] In a preferred embodiment, the vortex outlet chamber and the sewage buffer chamber are connected by a second manual valve, and the top of the horizontal container is connected to an exhaust and oil collection port. The exhaust and oil collection port is connected to the interior of the sewage buffer chamber and the interior of the sewage coalescence chamber through a first automatic valve. The first automatic valve is provided to facilitate the control of the liquid flow.

[0010] In a preferred embodiment, the interior of the sewage settling chamber and the interior of the filtered water outlet chamber are connected by a second automatic valve, which allows the purified water in the sewage settling chamber to flow into the filtered water outlet chamber for backwashing.

[0011] In a preferred embodiment, the horizontal container is provided with a total sewage outlet at the bottom. The oil removal cyclone inlet zone, the cyclone outlet chamber, the sewage coalescence chamber, and the filtered outlet chamber are all connected to the total sewage outlet via a third manual valve. The oil recovery chamber is connected to the total sewage outlet via a third automatic valve. The water distribution assembly is connected to the sewage settling chamber and the total sewage outlet via a double-pipe, and two fourth automatic valves are fixedly installed on the double-pipe. The fourth automatic valves facilitate automatic control of the liquid flow.

[0012] In a preferred embodiment, a wastewater recovery pipe connects the wastewater recovery chamber and the inertial separation zone. The wastewater in the wastewater recovery chamber is then transported back to the gas-liquid separation zone via the wastewater recovery pipe for further oil removal and filtration, thereby improving the filtration effect.

[0013] In a preferred embodiment, a manhole is fixedly provided on the top of the horizontal container, and the manhole is located between two first automatic valves, so that the staff can open the manhole to inspect the inside of the horizontal container.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. This utility model integrates multiple treatment functions such as gas-liquid separation, liquid-liquid cyclone oil removal, inclined plate coalescence, and horizontal filter media filtration into a single horizontal container. Compared with traditional multi-stage equipment combinations, it significantly reduces the equipment footprint and greatly saves space in oilfield wastewater treatment sites. Furthermore, the integrated structural design reduces the number of connecting pipes between equipment, lowers the risk of pipe leakage, and makes the equipment more stable in operation and easier to maintain.

[0016] 2. Through the coordinated operation of each functional area, oil and suspended solids in sewage can be removed efficiently, greatly reducing the oil and suspended solids content of the treated sewage. The treatment effect reaches or even exceeds the treatment level of a first-stage inclined plate oil separator followed by a first-stage filter media filter.

[0017] 3. The horizontal filtration zone enables automatic backwashing of the filter element, which greatly reduces the workload and frequency of manual filter element cleaning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the pipeline structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the gas-liquid separation zone structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the liquid-liquid cyclone oil removal zone structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the horizontal filter zone structure of this utility model.

[0023] The attached diagram is labeled as follows: 1. Horizontal container; 2. Gas-liquid separation zone; 201. Baffle; 202. Gas-liquid separator; 203. First manual valve; 204. Wastewater inlet of three-phase separator; 205. Inertial separation zone; 206. Oil removal cyclone inlet zone.

[0024] 3. Liquid-liquid hydrocyclone oil removal zone; 301. Oil removal hydrocyclone; 302. Air chamber; 303. Liquid inlet distributor; 304. Hydrocyclone oil outlet chamber; 305. Hydrocyclone water outlet chamber; 306. Wastewater recovery chamber; 307. Oil recovery chamber; 308. Exhaust port;

[0025] 4. Inclined plate coalescing zone; 401. Wastewater buffer chamber; 402. Wastewater coalescing chamber; 403. Wastewater settling chamber; 404. Coalescing packing assembly;

[0026] 5. Horizontal filtration zone; 501. Filter inlet chamber; 502. Filter media; 503. Filter outlet chamber; 504. Water distribution assembly; 505. Water collection assembly;

[0027] 6. Clean water outlet; 7. Second manual valve; 8. Exhaust and oil collection port; 9. First automatic valve; 10. Second automatic valve; 11. Main sewage outlet; 12. Third manual valve; 13. Third automatic valve; 14. Two-way pipe; 15. Fourth automatic valve; 16. Sewage recovery pipe; 17. Manhole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Refer to the instruction manual appendix Figures 1-5 This utility model provides a horizontal oilfield wastewater treatment device, including a horizontal container 1. The interior of the horizontal container 1 is divided into a gas-liquid separation zone 2, a liquid-liquid cyclone oil removal zone 3, an inclined plate coalescence zone 4, and a horizontal filtration zone 5 from left to right by multiple partitions. A baffle 201 and a gas-liquid separator 202 are fixedly installed inside the gas-liquid separation zone 2. The top of the gas-liquid separator 202 penetrates through the horizontal container 1 and extends to the outside of the horizontal container 1.

[0030] Furthermore, the gas-liquid separation zone 2 is connected to the inside of the air tank 302 via the first manual valve 203. The gas-liquid separator 202 is connected to the wastewater inlet 204 of the three-phase separator on one side, and the top of the gas-liquid separator 202 is connected to the inside of the air tank 302 via a hose. The gas-liquid separation zone 2 includes an inertial separation zone 205 and an oil removal cyclone liquid inlet zone 206.

[0031] The liquid-liquid cyclone oil removal zone 3 is fixedly equipped with an oil removal hydrocyclone 301 and an air chamber 302. The oil removal hydrocyclone 301 is connected to the gas-liquid separation zone 2 through a liquid inlet distributor 303. The liquid-liquid cyclone oil removal zone 3 includes a cyclone oil outlet chamber 304, a cyclone water outlet chamber 305, a wastewater recovery chamber 306, and a recovery oil chamber 307. The oil removal hydrocyclone 301 is located between the cyclone oil outlet chamber 304 and the cyclone water outlet chamber 305. The air chamber 302 is fixedly equipped with an exhaust port 308 at its top.

[0032] The inclined plate coalescing zone 4 includes a sewage buffer chamber 401, a sewage coalescing chamber 402, and a sewage settling chamber 403. The sewage coalescing chamber 402 is fixedly equipped with a coalescing packing group 404. The vortex outlet chamber 305 is connected to the sewage buffer chamber 401 through a second manual valve 7. The top of the horizontal container 1 is connected to an exhaust and oil collection port 8. The exhaust and oil collection port 8 is connected to the interior of the sewage buffer chamber 401 and the interior of the sewage coalescing chamber 402 through a first automatic valve 9.

[0033] The horizontal filtration zone 5 includes a filter inlet chamber 501, filter media 502, and filter outlet chamber 503 distributed from top to bottom. A water distribution assembly 504 is fixedly installed inside the filter inlet chamber 501, and a water collection assembly 505 is fixedly installed inside the filter outlet chamber 503. The water collection assembly 505 is connected to a clean water outlet 6, and the clean water outlet 6 extends out of the outside of the horizontal container 1.

[0034] In actual use, when the oilfield produced fluid arrives at the separation zone inside the gas-liquid separator 202 from the wastewater inlet 204 of the three-phase separator, this zone is equipped with baffles and a gas collection chamber. The produced fluid changes its flow direction under the action of the baffles. Based on the density difference between gas and liquid, the gas floats to the gas collection chamber and is discharged through the exhaust port 308 at the top of the gas collection chamber, thus realizing gas-liquid separation and effectively avoiding interference from the device to the subsequent liquid-liquid separation and filtration process.

[0035] When the liquid flows out from the bottom of the gas-liquid separator 202, it contacts the baffle 201 and disperses into the inertial separation zone 205 and the oil removal cyclone inlet zone 206. Then, the liquid flows into the oil removal cyclone 301 through the liquid inlet distributor 303. The oil removal cyclone 301 is equipped with multiple cyclone oil removal units. Each cyclone oil removal unit includes a cyclone chamber and a guide pipe. The sewage rotates at high speed in the cyclone chamber. Under the action of centrifugal force, the oil droplets with lower density converge towards the center of the cyclone chamber. Then, the separated oil phase is transported to the cyclone oil outlet chamber 304 and the air bag 302 located inside the horizontal container 1 through the guide pipe. The oil flows into the air bag 302 through the cyclone oil outlet chamber 304 and is stored in the recovery oil chamber 307. This process can efficiently remove most of the oily substances in the sewage.

[0036] The wastewater separated by the oil-removing hydrocyclone 301 flows into the main wastewater outlet through the hydrocyclone outlet chamber 305, and some wastewater flows into the wastewater buffer chamber 401 through the second manual valve 7, and then into the wastewater coalescing chamber 402. After passing through the coalescing packing group 404 in the wastewater coalescing chamber 402, the coalescing packing group 404 is composed of multiple coalescing inclined plates arranged at an angle. The coalescing inclined plates are made of oleophilic and hydrophobic materials. When the wastewater flows through the inclined plates, the tiny oil droplets aggregate into larger oil droplets on the surface of the inclined plates. At the same time, the suspended solids are precipitated and intercepted on the inclined plates. The coalesced oil droplets float to the oil collection tank at the top of the coalescing area 4 of the inclined plates and are discharged through the oil outlet of the oil collection tank. The suspended solids that settle on the inclined plates are periodically discharged through the sewage outlet, further reducing the oil content and suspended solids content in the wastewater.

[0037] After being filtered by the coalescing packing group 404, the wastewater flows into the wastewater settling chamber 403, and then flows into the water distribution assembly 504 and the main wastewater outlet through the dual-pipe 14. Multiple outlets on the water distribution assembly 504 disperse and spray the wastewater onto the filter media 502. The filter media 502 is a high-precision filter screen that can effectively intercept residual suspended solids and tiny oil droplets in the wastewater. After being filtered by the filter media 502, the wastewater flows into the filtered water outlet chamber 503. Then, the purified water is transported to the purified water outlet 6 through multiple inlets on the water collection assembly 505, thus obtaining purified water and completing the filtration treatment of the wastewater.

[0038] like Figure 1 and Figure 2 As shown, the horizontal container 1 has a total sewage outlet 11 at the bottom. The oil removal cyclone inlet zone 206, the cyclone outlet chamber 305, the sewage coalescence chamber 402 and the filtered outlet chamber 503 are all connected to the total sewage outlet 11 through a third manual valve 12. The oil recovery chamber 307 is connected to the total sewage outlet 11 through a third automatic valve 13. The water distribution assembly 504 is connected to the sewage settling chamber 403 and the total sewage outlet 11 through a double-pipe 14, and two fourth automatic valves 15 are fixedly installed on the double-pipe 14.

[0039] The main sewage outlet 11 can collect oil and dirt from the oil removal cyclone inlet zone 206, the cyclone outlet chamber 305, the sewage coalescence chamber 402, the filtered outlet chamber 503, and the oil recovery chamber 307, thus facilitating subsequent centralized treatment.

[0040] Refer to the instruction manual appendix Figure 1 and Figure 2 The interior of the sewage settling chamber 403 is connected to the interior of the filtered water outlet chamber 503 through a second automatic valve 10. A water pump is connected to the second automatic valve 10 to draw clean water from the top of the sewage settling chamber 403. The clean water is used to backwash the filter media 502 to remove impurities trapped on the surface of the filter media 502, thereby ensuring the filtration effect and service life.

[0041] Furthermore, a sewage recovery pipe 16 is connected between the sewage recovery chamber 306 and the inertial separation zone 205. A recovery pump and a manual control valve are installed on the sewage recovery pipe 16. The recovery pump is used to pump sewage, thereby enabling the sewage in the sewage recovery chamber 306 to be filtered for oil again, improving the filtration effect.

[0042] like Figure 1 and Figure 2 As shown, a manhole 17 is also fixedly provided on the top of the horizontal container 1. The manhole 17 is located between the two first automatic valves 9, which facilitates the staff to inspect the inside of the horizontal container 1.

[0043] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A horizontal oilfield wastewater treatment device, comprising a horizontal container (1), characterized in that: The horizontal container (1) is divided into a gas-liquid separation zone (2), a liquid-liquid cyclone oil removal zone (3), an inclined plate coalescence zone (4), and a horizontal filtration zone (5) from left to right by multiple partitions. The gas-liquid separation zone (2) is fixedly provided with a baffle (201) and a gas-liquid separator (202). The top of the gas-liquid separator (202) penetrates through the horizontal container (1) and extends to the outside of the horizontal container (1). The liquid-liquid cyclone oil removal zone (3) is fixedly equipped with an oil removal cyclone separator (301) and an air chamber (302). The inclined plate coalescing zone (4) includes a sewage buffer chamber (401), a sewage coalescing chamber (402) and a sewage settling chamber (403), and a coalescing packing group (404) is fixedly installed inside the sewage coalescing chamber (402). The horizontal filtration zone (5) includes a filter inlet chamber (501), filter media (502), and filter outlet chamber (503) distributed from top to bottom.

2. The horizontal oilfield wastewater treatment device according to claim 1, characterized in that: The gas-liquid separation zone (2) is connected to the inside of the gas bag (302) through the first manual valve (203), and the gas-liquid separator (202) is connected to the sewage inlet (204) of the three-phase separator on one side. The gas-liquid separation zone (2) includes an inertial separation zone (205) and an oil removal cyclone inlet zone (206). The oil removal cyclone (301) is connected to the interior of the gas-liquid separation zone (2) through the inlet distributor (303).

3. A horizontal oilfield wastewater treatment device according to claim 2, characterized in that: The liquid-liquid cyclone oil removal zone (3) includes a cyclone oil outlet chamber (304), a cyclone water outlet chamber (305), a wastewater recovery chamber (306), and a recovery oil chamber (307). The oil removal cyclone (301) is located between the cyclone oil outlet chamber (304) and the cyclone water outlet chamber (305). The top of the air bag (302) is fixedly provided with an exhaust port (308).

4. A horizontal oilfield wastewater treatment device according to claim 3, characterized in that: The filter inlet chamber (501) is fixedly equipped with a water distribution component (504), and the filter outlet chamber (503) is fixedly equipped with a water collection component (505). The water collection component (505) is connected to a clean water outlet (6), and the clean water outlet (6) extends out of the outside of the horizontal container (1).

5. A horizontal oilfield wastewater treatment device according to claim 3, characterized in that: The vortex outlet chamber (305) and the sewage buffer chamber (401) are connected by a second manual valve (7). The top of the horizontal container (1) is connected to an exhaust oil collection port (8). The exhaust oil collection port (8) is connected to the inside of the sewage buffer chamber (401) and the inside of the sewage coalescence chamber (402) through a first automatic valve (9).

6. A horizontal oilfield wastewater treatment device according to claim 4, characterized in that: The interior of the sewage settling chamber (403) and the interior of the filtered water outlet chamber (503) are connected by a second automatic valve (10).

7. A horizontal oilfield wastewater treatment device according to claim 4, characterized in that: The horizontal container (1) is provided with a total sewage outlet (11) at the bottom. The oil removal cyclone inlet zone (206), cyclone outlet chamber (305), sewage coalescence chamber (402) and filter outlet chamber (503) are all connected to the total sewage outlet (11) through a third manual valve (12). The oil recovery chamber (307) is connected to the total sewage outlet (11) through a third automatic valve (13). The water distribution assembly (504) is connected to the sewage settling chamber (403) and the total sewage outlet (11) through a double pipe (14) respectively. Two fourth automatic valves (15) are fixedly installed on the double pipe (14).

8. A horizontal oilfield wastewater treatment device according to claim 3, characterized in that: The wastewater recycling chamber (306) is connected to the inertial separation zone (205) by a wastewater recycling pipe (16).

9. A horizontal oilfield wastewater treatment device according to claim 5, characterized in that: The top of the horizontal container (1) is fixedly provided with a manhole (17), which is located between two first automatic valves (9).

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