A field separation device capable of quickly recovering fallen mixed liquid

Abstract

A field separation device for rapidly recovering spilled mixed liquid. It primarily addresses the problems of poor treatment efficiency and ineffective oil-water separation in existing spilled mixed liquid systems. Its features include: a vacuum suction pump (11) draws sludge into an oil filter tank (2); after the filter tank (2) removes mud and sand, the oil-water mixture enters a separation tank; after separation in the separation tank, it is pumped by an oil suction pump (7) to an oil collection manifold and then into an oil storage tank (1); the separated water is pumped by a water suction pump (9) to a backwash heating tank (8), and then filtered through a membrane filtration device before being discharged. This field separation device for rapidly recovering spilled mixed liquid can achieve oil, water, and mud separation, and the separated water after multi-stage separation meets the discharge standards.

Description

Technical Field

[0001] This invention relates to the field of oilfield wastewater treatment, specifically to an on-site separation device that can quickly recover spilled mixed liquids. Background Technology

[0002] During production and operation, oil and water wells in oil fields often experience pipeline leaks, which can cause mixed liquids to spill onto the ground. Currently, most methods for handling spilled mixed liquids involve manual bagging, using water scoops to remove the oil, or recycling with oily waste trucks or tanks. These methods are labor-intensive, difficult to operate, have poor surface oil treatment, incomplete oily waste cleaning, poor oil-cement separation, and require significant investment in recycling and treating oily wastewater. Summary of the Invention

[0003] In order to overcome the problems of poor treatment effect and poor oil-cement separation effect of existing spilled liquid treatment, the present invention provides an on-site separation device that can quickly recover spilled liquid. This on-site separation device can realize the separation of oil, water and mud, and the separated water after multi-stage separation meets the sewage discharge standards.

[0004] The technical solution of the present invention is: a field separation device for rapid recovery of spilled mixed liquid, including a vacuum suction pump and an oil filter tank. The vacuum suction pump sucks the sludge oil into the oil filter tank. After the oil filter tank filters out the mud and sand, the oil-water mixture enters the separation tank. After separation in the separation tank, the mixture is pumped to the oil collection manifold by the oil suction pump and then enters the oil storage tank. The separated water is pumped to the backwash heating tank by the water suction pump. The water discharged from the backwash heating tank is filtered by the membrane filtration device and then discharged.

[0005] The oil filter tank is equipped with two partitions. The first partition divides the oil filter tank into a sedimentation zone and an oil-water mixing zone. The sedimentation zone corresponds to the inlet pipeline of the oil filter tank. The oil-water mixing zone is divided into a chemical mixing chamber and a primary oil-water separation chamber by the second partition. The first partition has a filter hole at the upper part corresponding to the chemical mixing chamber, and the second partition has a filter hole at the upper part.

[0006] The upper part of the primary oil-water separation chamber in the oil filter tank is connected to the low water content oil outlet pipeline via a control nozzle, the bottom of the primary oil-water separation chamber is connected to the mixed liquid outlet pipeline, and the bottom of the sediment settling zone is connected to the backwash pipeline.

[0007] A mixer is installed above the chemical mixing chamber of the oil filter tank, and an impact separation cap is connected to the inlet pipeline of the oil filter tank in the sedimentation zone.

[0008] The separation tank includes a primary separation tank, a secondary separation tank, a tertiary separation tank, and a filter media separation tank, which are connected in sequence. The tops of the primary, secondary, and tertiary separation tanks are all connected to the oil collection manifold via oil nozzles. The filter media separation tank is connected to the backwash heating tank.

[0009] The three-stage separation tank consists of two separate tank units connected in series.

[0010] The primary separation tank includes a tank body, with a feed pipe connected to the upper end of the tank body. Filter media is installed inside the tank body, and a central permeation pipe is connected to the lower end of the tank body. Several liquid passage holes are opened on the side wall of the central permeation pipe, and a filter membrane is wrapped around the outside of the side wall. The upper end of the central permeation pipe is located inside the filter media, and the lower end is connected to the liquid outlet pipe.

[0011] The separation tank, oil filter tank, backwash heating tank, and water suction pump are located on the separation tank truck, while the oil storage tank and vacuum sludge pump are located on the sludge tank truck. The sludge tank truck is also equipped with a diesel generator and an electrical control system. During operation, the separation tank truck and the sludge tank truck are towed to the sludge site by a tractor.

[0012] It also includes an atomizing pump, which is connected to the backwash heating tank. The water in the backwash heating tank is heated and then used by the atomizing pump to clean the filter tank, the separation tank truck, and the sludge tank truck.

[0013] There are two water pumps. During filtration, the first water pump draws water from the separation tank into the backwash heating tank. During backwashing, the second water pump draws water from the backwash heating tank into the separation tank to backwash the separation tank.

[0014] The present invention has the following beneficial effects: Due to the above-mentioned solution, the device can recover the spilled mixed liquid on site, realize the separation of oil, water and mud, the mud and sand are deposited in the oil filter tank, the mixed liquid is filtered through multiple stages, the oil enters the oil storage tank, and the separated water after multiple stages of separation can meet the discharge standards and be discharged or reused. The treatment effect of floating oil on the ground or water surface is good and the cleaning of sludge and oil is more thorough. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the oil filter tank;

[0017] Figure 3 This is a schematic diagram of the oil filter tank from another angle;

[0018] Figure 4 This is a schematic diagram of a three-stage separator;

[0019] Figure 5 This is a schematic diagram of a primary separator.

[0020] In the diagram: 1-Oil storage tank, 2-Oil filter tank, 3-Primary separation tank, 4-Secondary separation tank, 5-Tertiary separation tank, 6-Filter media separation tank, 7-Oil suction pump, 8-Backwash heating tank, 9-Water suction pump, 10-Oil suction pipe, 11-Vacuum suction pump, 21-Oil filter tank inlet pipeline, 22-Impact separation cap, 23-Control oil nozzle, 24-Agitator, 25-Medicine mixing chamber, 26-Second baffle, 27-Second cleaning port, 28-Second drain valve, 29-Third cleaning port, 30-Third drain valve, 31-Primary oil-water separation chamber, 32-Mixed liquid outlet pipeline, 33-Backwash pipeline, 34-First baffle, 35-First cleaning port, 36-First drain valve, 37-Low oil content outlet pipeline, 41-Central seepage pipe. Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Depend on Figures 1 to 5 As shown, an on-site separation device for rapidly recovering spilled mixed liquids includes a tractor, a sludge tanker, and a separation tanker. The sludge tanker is equipped with a diesel generator, a vacuum pump 11, an oil storage tank 1, an oil suction pipe 10, and an electrical control system. The separation tanker is equipped with an oil filter tank 2, a separation tank, a backwash heating tank 8, an oil suction pump 7, a water suction pump 9, and an atomizing pump, etc. During operation, the separation tanker and the sludge tanker are towed to the sludge site by the tractor.

[0023] The oil filter tank 2 is connected to an oil filter tank inlet pipe 21, which is connected to an oil suction pipe 10. After the vacuum sludge pump 11 is started, it can suck the sludge oil into the filter tank 2 through the oil filter tank inlet pipe 21. The oil filter tank 2 is equipped with two partitions. The first partition 34 divides the oil filter tank 2 into a sedimentation zone and an oil-water mixing zone. The sedimentation zone corresponds to the oil filter tank inlet pipe 21, and the oil filter tank inlet pipe 21 in the sedimentation zone is connected to an impact separation cap 22. After the mixed liquid flows out of the oil filter tank inlet pipe 21 and comes into contact with the impact separation cap 22, the mixed liquid is quickly separated under a large impact force. Due to gravity, the sediment settles at the bottom, eliminating the tension between the oil and water. The oil-water mixing zone is divided into a chemical mixing chamber 25 and a primary oil-water separation chamber 31 by the second partition 26. A mixer 24 is installed above the chemical mixing chamber 25 on the oil filter tank 2, allowing the addition of chemicals to the mixing chamber 25. The mixing process thoroughly mixes the chemicals with the sludge, and the chemicals treat the oil-water mixture, achieving initial oil-water separation. Filter holes are located at the top of the first partition 34 corresponding to the chemical mixing chamber 25, and at the top of the second partition 26. The upper part of the primary oil-water separation chamber 31 is connected to a low-water-content oil outlet pipeline 37 via a control nozzle 23, and the bottom of the primary oil-water separation chamber 31 is connected to a mixed liquid outlet pipeline 32. The bottom of the sediment settling zone is connected to a backwash pipeline 33. The bottom of the sediment settling zone is equipped with a first cleaning port 35 and a first drain valve 36. The chemical mixing chamber 25 is equipped with a second cleaning port 27 and a second drain valve 28. The bottom of the oil-water primary separation chamber 31 is equipped with a third cleaning port 29 and a third drain valve 30. When the sludge enters the sediment settling zone, it is blocked by the first baffle 34, and large particles such as sludge and weeds will settle down. The oil-water mixture enters the chemical mixing chamber 25 through the filter holes at the top of the first baffle 34. After separation in the chemical mixing chamber 25, the oil-water mixture enters the oil-water primary separation chamber 31 through the second baffle 26. In the oil-water primary separation chamber 31, the oil is on top and the wastewater is at the bottom. Therefore, the oil enters the oil collection manifold through the low water content oil outlet pipeline 37 and is finally pumped into the oil storage tank 1 by the oil suction pump 7; the wastewater enters the separation tank through the mixture outlet pipeline 32. The upper part of the oil filter tank 2 is equipped with a vent control valve, which can be used to regulate the pressure in the tank or the system to prevent the oil filter tank 2 from being deformed by the suction force generated when the vacuum sewage pump 11 is started. Before starting the vacuum sewage pump 11, open the vent control valve. After the pressure stabilizes, judge the opening degree of the valve according to the site conditions.

[0024] The separation tank system includes a primary separation tank 3, a secondary separation tank 4, a tertiary separation tank 5, and a filter media separation tank 6, which are connected in sequence. The primary separation tank 3 includes a tank body with a feed pipe connected to the upper end. Filter media is installed inside the tank body, and a central permeation pipe 41 is connected to the lower end. The central permeation pipe 41 has liquid passage holes on its side wall, and a filter membrane is wrapped around the outside of the side wall to filter the liquid. The upper end of the central permeation pipe 41 is located inside the filter media, and the lower end is connected to a water outlet pipe. The secondary separation tank 4 has the same structure as the primary separation tank 3, but the pore size of the filter membrane in the secondary separation tank 4 is smaller than that in the primary separation tank 3. The tertiary separation tank 5 consists of two vertically connected separation tank units with identical structures. The central permeation pipe inside the two tank units also has a filter membrane, but its pore size is smaller than that of the filter membrane in the secondary separation tank 4. The series connection of the three-stage separation tank 5 avoids difficulties in seepage caused by excessively thick filter media covering the central seepage pipe or excessively large filter membrane mesh size during the mixed liquor seepage process, ensuring smooth seepage. The tops of the primary separation tank 3, secondary separation tank 4, and tertiary separation tank 5 are all connected to the oil collection manifold via oil nozzles. Oil at the top enters the oil collection manifold through the oil nozzles under pressure differential. The outlet of the filter media separation tank 5 is connected to the backwash heating tank 8. The oil-water mixture enters the primary separation tank 3 from the bottom of the filter tank 2. Low-water-content oil floats at the top of the tank and enters the oil collection manifold through the oil nozzles. Wastewater from the bottom of the primary separation tank 3 flows sequentially into the secondary separation tank 4 and tertiary separation tank 5. Low-water-content oil enters the oil collection manifold through the oil nozzles and is finally pumped into the oil storage tank 1 by the oil suction pump 7. Wastewater enters the filter media separation tank 6 from the tertiary separation tank 5. Oil is adsorbed in the filter media, and water enters the backwash heating tank 8.

[0025] The backwash heating tank 8 contains heat-conducting oil. Heating the oil raises the water temperature inside the tank to above 75°C. Water flowing out of the backwash heating tank 8 enters a membrane filtration device. This device uses a YJ-GLM1s membrane filter manufactured by Shaoxing Yuecheng Yongji Industrial Co., Ltd., with a membrane pore size of 0.2µm. After filtration, the water meets national standards for discharge or reuse. Two suction pumps 9 are connected to the pipeline between the backwash heating tank 8 and the filter media separation tank 6. During filtration, the first pump draws water from the separation tank into the backwash heating tank 8; during backwashing, the second pump draws water from the backwash heating tank 8 into the separation tank, performing backwashing on the separation tank in stages. An atomizing pump is also included, connected to the backwash heating tank 8. After heating, the water in the backwash heating tank 8 is used by the atomizing pump to clean the filter tank 2, the separation tank truck, and the sludge tank truck. It can also clean other vehicles and wellhead trees.

[0026] A first pressure gauge is installed on the water pipe connecting the filter media separation tank 6 and the backwashing hot tank 8, and a second pressure gauge is installed on the oil collection manifold. Because the filtered low-water-content oil in the device flows quickly through a short seepage channel via the oil nozzle, while the separated water undergoes a long seepage process with a denser seepage channel and a slower flow rate, it is necessary to adjust the pressure of the oil suction pump 7 and the water suction pump 9 to ensure the normal outflow of the low-water-content oil and achieve the desired separation effect for the separated water.

[0027] During operation, the separation tanker and the sludge tanker are towed to the sludge site by a tractor. The diesel generator is started to drive the vacuum pump 11, which draws the sludge into the oil filter tank 2 through the suction pipe 10. Simultaneously, the water pump 9 starts. The oil filter tank 2 performs preliminary filtration and separation of the sludge, removing impurities such as mud and weeds. The low-water-content oil enters the oil collection manifold. The oil-water mixture sequentially enters the primary separation tank 3, the secondary separation tank 4, the tertiary separation tank 5, and the filter media separation tank 6. At this time, the nozzles on each separation tank are closed. When the pressure indicated by the first pressure gauge on the water pipe reaches the preset value, the nozzles on the top of each tank open, and the oil pump 7 starts, drawing the oil into the oil collection manifold, and then into the oil storage tank 1. After the mixture is filtered in the filter media separation tank 6, the oil is adsorbed in the filter media. The water is drawn by the water pump 9 to the backwash heating tank 8. After being heated in the backwash heating tank 8, the water enters the membrane filtration device for further filtration before being discharged or reused. When the pressure indicated by the second pressure gauge on the oil receiving manifold is lower than the preset value, the oil suction pump 7 shuts off, completing the oil extraction. When backwashing is required, the water suction pump 9 is switched on and off to backwash the filter media separation tank 6 and the three separation tanks in stages.

Claims

1. A field separation device for rapidly recovering spilled mixed liquid, comprising a vacuum sludge pump (11) and an oil filter tank (2), characterized in that: The vacuum suction pump (11) sucks the sludge oil into the oil filter tank (2). The oil-water mixture after the oil filter tank (2) filters out the mud and sand enters the separation tank. After separation in the separation tank, it is sucked into the oil collection manifold by the oil suction pump (7) and then enters the oil storage tank (1). The separated water is sucked into the backwash heating tank (8) by the water suction pump (9). The water discharged from the backwash heating tank (8) is filtered by the membrane filter device and then discharged. The oil filter tank (2) is provided with two partitions. The first partition (34) divides the oil filter tank (2) into a sedimentation zone and an oil-water mixing zone. The sedimentation zone corresponds to the oil filter tank inlet pipeline (21). The oil-water mixing zone is divided into a liquid stirring chamber (25) and an oil-water primary separation chamber (31) by the second partition (26). The first partition (34) has a filter hole at the upper part corresponding to the liquid stirring chamber (25). The second partition (26) has a filter hole at the upper part. The oil filter tank inlet pipeline (21) in the sedimentation zone is connected to an impact separation cap (22). The separation tank includes a primary separation tank (3), a secondary separation tank (4), a tertiary separation tank (5), and a filter media separation tank (6). The four separation tanks are connected in sequence. The tops of the primary separation tank (3), the secondary separation tank (4), and the tertiary separation tank (5) are all connected to the oil collection manifold via oil nozzles. The filter media separation tank (6) is connected to the backwash heating tank (8). The primary separation tank (3) includes a tank body, with a feed pipe connected to the upper end of the tank body, filter material inside the tank body, and a central permeation pipe (41) connected to the lower end of the tank body. Several liquid passage holes are opened on the side wall of the central permeation pipe (41), and the side wall is wrapped with a filter membrane. The upper end of the central permeation pipe (41) is located inside the filter material, and the lower end is connected to the liquid outlet pipe.

2. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 1, characterized in that: The upper part of the primary oil-water separation chamber (31) of the oil filter tank (2) is connected to the low oil content outlet pipeline (37) through the control nozzle (23), the bottom of the primary oil-water separation chamber (31) is connected to the mixed liquid outlet pipeline (32), and the bottom of the sedimentation zone is connected to the backwash pipeline (33).

3. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 2, characterized in that: A mixer (24) is provided above the medicine mixing chamber (25) of the oil filter tank (2).

4. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 1, characterized in that: The three-stage separation tank (5) consists of two separate tank units connected in series.

5. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 1, characterized in that: The separation tank, oil filter tank (2), backwash heating tank (8), and water suction pump (9) are located on the separation tank truck, and the oil storage tank (1) and vacuum sewage pump (11) are located on the sludge tank truck. The sludge tank truck is also equipped with a diesel generator and an electrical control system. During operation, the separation tank truck and the sludge tank truck are towed to the sludge site by a tractor.

6. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 1, characterized in that: It also includes an atomizing pump, which is connected to the backwash heating tank (8). After the water in the backwash heating tank (8) is heated, the atomizing pump cleans the oil filter tank (2), the separation tank truck, and the sludge tank truck.

7. The on-site separation device for rapidly recovering spilled mixed liquid according to claim 1, characterized in that: There are two water pumps (9). During filtration, the first water pump draws water from the separation tank into the backwash heating tank (8). During backwashing, the second water pump draws water from the backwash heating tank (8) into the separation tank to backwash the separation tank.

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