An experimental device for oil-water separation of oilfield brine

Abstract

The utility model belongs to the brine oil water separation technical field especially relates to an oilfield brine oil water separation experimental device, which comprises: the filter separation device, ultrasonic separation device, gravity separation device and brine collecting device that are sequentially and communicatively arranged; the filter separation device is internally provided with a filter assembly; the ultrasonic separation device is internally provided with an ultrasonic oil water separation integrated system, and the ultrasonic separation device is provided with two liquid discharge ports, one of which is in communication with the liquid inlet of the gravity separation device to enable the oil-containing brine to enter the gravity separation device, and the other liquid discharge port is used for discharging crude oil; the gravity separation device is used for the gravity separation of oil and brine in the oil-containing brine, and the separated brine enters the brine collecting device. The experimental device realizes the complete separation of crude oil and brine based on the composite principle of "filtration-ultrasonic-gravity separation"; meanwhile, the oil water separation is realized through physical methods such as filtration, ultrasonic method and gravity separation method, and the brine properties are not easy to change.

Description

Technical Field

[0001] This utility model belongs to the field of brine oil-water separation technology, and in particular relates to an experimental device for oilfield brine oil-water separation. Background Technology

[0002] Underground brine is a type of underground liquid mineral resource. Associated brine is widely distributed in oil and gas fields. The brine collected from oilfield areas is often highly mixed hot brine containing oil and gas. Separating crude oil and brine is of great significance for the utilization of associated brine resources in oil and gas fields and for environmental protection.

[0003] Oil-water separation typically employs methods such as gravity separation, centrifugal separation, air flotation separation, electrostatic separation, and adsorption separation. Chinese patent CN112473235A discloses an oil-water separation device and method, including a float plate slidably connected within a tank via a first sliding groove and a first slider. This float plate automatically floats on the oil-water separation surface. An oil suction mechanism works in conjunction with a first and second solenoid valve via a connecting pipe. The second suction nozzle has a smaller orifice to reduce fluctuations. A filtration mechanism uses an inclined screen and spring-assisted vibration. During operation, the oil-water mixture enters through the feed pipe, is filtered by the screen, and settles into stratified layers. The float plate adapts to the oil level height. A water pump draws oil to the oil tank through the suction nozzle. The suction nozzle is opened simultaneously, and then the first solenoid valve is closed for complete separation. The resulting technical benefits include simplified operation, reduced costs, improved separation efficiency, and anti-clogging.

[0004] Chinese Patent CN112479452A discloses an ultrasonic coalescing oil-water separation device for produced water containing coalesced material. The device includes an ultrasonic coalescing zone, a coarse separation chamber, and a fine separation chamber separated by a perforated partition. The bottom of the ultrasonic coalescing zone is connected to an inlet pipe, and an ultrasonic transducer connected to an ultrasonic transmitter is mounted axially at its center. A 20kHz sound wave is applied vertically to the water flow to accelerate oil droplet coalescence. The coarse separation chamber is configured in a labyrinth shape, consisting of inner and outer sleeves and a central tube, to achieve initial oil-water separation. The lower effluent buffer zone of the fine separation chamber contains a mesh coalescing element made of stainless steel perforated corrugated packing for further coalescing fine oil droplets. The top oily zone and oil drain pipes in each zone collect and discharge floating oil, while the bottom effluent pipe discharges purified water. This device, through three-stage treatment—ultrasonic coalescing, labyrinth separation, and mesh coalescing—solves the problem of difficult oil-water separation caused by high viscosity and severe emulsification in produced water containing coalesced material, reducing the oil content of the effluent to ≤100mg / L, meeting the standards for the next stage of filtration.

[0005] However, the above-mentioned existing technologies are all separation equipment manufactured using a single separation principle, and there is still room for improvement in the separation effect of crude oil and brine.

[0006] Therefore, we propose an experimental device for oil-water separation in oilfield brine to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide an experimental device for separating oil and water in oilfield brine to solve the above-mentioned problems.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] An experimental apparatus for separating oil and water in oilfield brine includes: a filtration separation device, an ultrasonic separation device, a gravity separation device, and a brine collection device arranged in sequence.

[0010] The filtration and separation device is equipped with a filtration component, which is used for preliminary oil-water separation.

[0011] The ultrasonic separation device is equipped with an ultrasonic oil-water separation integrated system, which separates the oil-water mixture into crude oil in the upper layer and oily brine in the lower layer. The ultrasonic separation device is provided with two drain ports, one of which is connected to the inlet of the gravity separation device, allowing the oily brine to enter the gravity separation device, and the other drain port is used to discharge the crude oil.

[0012] The gravity separation device is used to separate the oil and brine in the oily brine by gravity, wherein the separated brine enters the brine collection device.

[0013] Optionally, the filtration and separation device includes a funnel-shaped inlet tank, the bottom of which is connected to the top of the ultrasonic separation device, and the filtration assembly is located inside the funnel-shaped inlet tank.

[0014] Optionally, the filter assembly includes a base fixedly connected to the inner wall of the funnel-shaped liquid inlet tank, the base being coaxially arranged with the funnel-shaped liquid inlet tank, and a filter screen coaxially arranged on the base.

[0015] Optionally, the ultrasonic separation device includes an inverted conical liquid collection tank, the top of which is connected to the bottom of the funnel-shaped liquid inlet tank, the ultrasonic oil-water separation integrated system is connected to the side wall of the inverted conical liquid collection tank, one bottom side of the inverted conical liquid collection tank is connected to the crude oil collection tank through a first valve, and the other bottom side of the inverted conical liquid collection tank is connected to the gravity separation device through a second valve.

[0016] Optionally, the gravity separation device includes a plurality of sequentially connected separation chambers, with adjacent separation chambers connected by a first connecting valve;

[0017] The separation chamber is connected to an exhaust section and a drainage section;

[0018] The liquid inlet of the separation box located at the top is connected to the bottom of the inverted conical liquid collection tank through the second valve;

[0019] The liquid outlet of the separation tank located at the bottom is connected to the brine collection device through a second connecting valve;

[0020] An oil level detection component is installed inside the separation chamber located at the bottom.

[0021] Optionally, the exhaust section includes an exhaust pipe connected to the top of the separation chamber, and a valve is connected to the exhaust pipe.

[0022] Optionally, the drainage section includes a drainage pipe, which is connected to the bottom of the separation chamber and has a valve connected to it.

[0023] Optionally, the oil level detection assembly includes a float and a fluorescent water oil sensor fixed to the float.

[0024] Optionally, the brine collection device includes a brine collection tank, a pressure sensor is connected inside the brine collection tank, a miniature vacuum pump is connected to the brine collection tank through a vacuum pump valve, and a brine collection tank is connected to a drain valve.

[0025] Optionally, the bottom cross-section of the inverted conical liquid collection tank is an upwardly convex arc shape.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] This apparatus comprises a filtration and separation device, an ultrasonic separation device, a gravity separation device, and a brine collection device. This experimental apparatus integrates filtration, ultrasonic, and gravity separation devices, and separates crude oil and brine based on a composite principle of "filtration-ultrasonic-gravity separation," achieving complete separation of the two. Furthermore, this apparatus primarily utilizes physical methods such as filtration, ultrasonication, and gravity separation to separate crude oil and brine, without significantly altering the properties of the brine. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2This is a schematic diagram of the structure of the filtration and separation device and the ultrasonic separation device of this utility model;

[0031] Figure 3 This is a schematic diagram of the gravity separation device of this utility model;

[0032] Figure 4 This is a schematic diagram of the brine collection device of this utility model;

[0033] Figure 5 This is a schematic diagram of the oil level detection component of this utility model;

[0034] The components include: 1. Filtration and separation device; 101. Base; 102. Filter screen; 103. Funnel-shaped liquid inlet tank; 2. Ultrasonic separation device; 201. Ultrasonic oil-water separation integrated system; 202. First valve; 203. Second valve; 204. Inverted cone-shaped liquid collection tank; 3. Gravity separation device; 301. Separation box; 302. Exhaust pipe; 303. Drain pipe; 4. Brine collection device; 401. Pressure sensor; 402. Miniature vacuum pump; 403. Vacuum pump valve; 404. Drain valve; 405. Brine collection tank; 5. First connecting valve; 6. Second connecting valve; 7. Oil quantity detection component; 701. Fluorescent oil-water sensor; 702. Float. Detailed Implementation

[0035] 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.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1 to 5 This utility model discloses an oilfield brine oil-water separation experimental device, comprising: a filtration separation device 1, an ultrasonic separation device 2, a gravity separation device 3, and a brine collection device 4 arranged in sequence;

[0038] The filtration and separation device 1 is equipped with a filtration assembly, which is used for preliminary oil-water separation.

[0039] The ultrasonic separation device 2 is equipped with an ultrasonic oil-water separation integrated system 201. The ultrasonic oil-water separation integrated system 201 separates the oil-water mixture into crude oil in the upper layer and oily brine in the lower layer. The ultrasonic separation device 2 is equipped with two drain ports. One drain port is connected to the inlet of the gravity separation device 3, so that the oily brine enters the gravity separation device 3. The other drain port is used for crude oil discharge.

[0040] Gravity separation device 3 is used for gravity separation of oil and brine in oily brine, wherein the separated brine enters brine collection device 4.

[0041] This apparatus comprises a filtration and separation device 1, an ultrasonic separation device 2, a gravity separation device 3, and a brine collection device 4. This experimental apparatus integrates filtration, ultrasonic, and gravity separation devices into one unit, using a composite principle of "filtration-ultrasonic-gravity separation" to separate crude oil and brine, achieving complete separation. Furthermore, this apparatus primarily utilizes physical methods such as filtration, ultrasonication, and gravity separation to separate crude oil and brine, without significantly altering the properties of the brine.

[0042] As an optional implementation, the filtration and separation device 1 includes a funnel-shaped inlet tank 103, the bottom of which is connected to the top of the ultrasonic separation device 2, and the filtration assembly is located inside the funnel-shaped inlet tank 103.

[0043] As an optional implementation, the filter assembly includes a base 101, which is fixedly connected to the inner wall of the funnel-shaped liquid inlet tank 103. The base 101 and the funnel-shaped liquid inlet tank 103 are coaxially arranged, and a filter screen 102 is placed on the base 101.

[0044] As an optional implementation, the ultrasonic separation device 2 includes an inverted conical liquid collection tank 204, the top of which is connected to the bottom of the funnel-shaped liquid inlet tank 103. An ultrasonic oil-water separation integrated system 201 is connected to the side wall of the inverted conical liquid collection tank 204. One bottom side of the inverted conical liquid collection tank 204 is connected to the crude oil collection tank through a first valve 202, and the other bottom side of the inverted conical liquid collection tank 204 is connected to the gravity separation device 3 through a second valve 203.

[0045] The filtration and separation device 1 is equipped with a crude oil filtration system. When the oil-water mixture passes through the filtration system, some of the crude oil is filtered out, and the solution directly enters the ultrasonic separation device. The filter screen 102 is attached to the base 101 and is replaceable. The main body of the filtration and separation device 1 is wider at the top and narrower at the bottom, with a diameter between the widest and narrowest points, and is detachable.

[0046] The filtration system can filter out some of the crude oil in an oil-water mixture.

[0047] The ultrasonic separation device 2 is equipped with an integrated ultrasonic oil-water separation system 201. This system has adjustable parameters such as ultrasonic frequency, sound intensity, and radiation time, and separates the oil and water through cavitation and mechanical separation. Generally, the ultrasonic frequency is ≤30kHz, the sound intensity is ≥6W / cm², and the radiation time is 40-80 minutes, until clear stratification of the crude oil and brine occurs. One side of the bottom of the ultrasonic separation device 2 is connected to a gravity separation device 3 via a second valve 203. Opening the second valve 203 allows the lower layer of clarified brine to enter the gravity separation device 3 until the oil-water boundary is reached. The other side of the bottom of the ultrasonic separation device 2 has a drain port connected to a first valve 202. Opening the first valve 202 allows the upper layer of crude oil to be discharged into a crude oil collector.

[0048] The ultrasonic separation device 2 separates crude oil from brine through ultrasonic cavitation. Under the action of ultrasound, crude oil molecules vibrate continuously and gather at the trough of the ultrasound waves. Under the action of density difference and buoyancy, crude oil floats to the surface of brine, thus achieving oil-water separation.

[0049] Furthermore, the filtration separation device 1 and the ultrasonic separation device 2 are designed as an integrated structure, which is an hourglass shape that is wider at the top and bottom and narrower in the middle. The plane is circular, and the narrowest point is the boundary between the filtration separation device 1 and the ultrasonic separation device 2. The diameter of the base 101 is between the widest point at the top and the narrowest point.

[0050] Furthermore, the ultrasonic oil-water separation integrated system 201 is composed of a signal generator, a power amplifier, and a transducer. The ultrasonic frequency, radiation time, sound intensity, and other parameters of this system are adjustable. Simultaneously, this ultrasonic system can achieve self-cleaning of the device.

[0051] Furthermore, the main body of both the filtration and separation device 1 and the ultrasonic separation device 2 is made of transparent material to facilitate observation of the stratification boundary after the crude oil and brine are separated. The main body of the ultrasonic separation device has a volume of not less than 2L and is graduated to determine the inlet liquid volume.

[0052] As an optional implementation, the gravity separation device 3 includes a plurality of sequentially connected separation chambers 301, with adjacent separation chambers 301 connected by a first connecting valve 5.

[0053] The separation chamber 301 is connected to an exhaust section and a drainage section;

[0054] The liquid inlet of the top-mounted separation tank 301 is connected to the bottom of the inverted conical collection tank 204 via the second valve 203;

[0055] The liquid outlet of the separation tank 301 located at the bottom is connected to the brine collection device 4 through the second connecting valve 6;

[0056] An oil level detection component 7 is installed inside the separation box 301 located at the bottom.

[0057] As an optional implementation, the exhaust section includes an exhaust pipe 302, which is connected to the top of the separation box 301, and a valve is connected to the exhaust pipe 302.

[0058] As an optional implementation, the drain section includes a drain pipe 303, which is connected to the bottom of the separation chamber 301, and a valve is connected to the drain pipe 303.

[0059] As an optional implementation, the oil level detection assembly 7 includes a float 702 and a fluorescent water oil sensor 701 fixed on the float 702.

[0060] The gravity separation device 3 consists of multiple separation chambers, enabling multi-stage gravity separation. An exhaust pipe 302 is connected to the upper side of each chamber, and the exhaust pipe 302 is equipped with a valve. Opening the valve ensures that gas is expelled from the chamber when the solution enters. The solution is allowed to settle within the separation chambers for gravity separation; typically, each stage of separation takes ≥1 day. Connecting pipes are installed between the chambers, each equipped with a first connecting valve 5. Opening these valves allows the lower layer of clarified brine to enter the next chamber, continuing until the oil-water boundary is reached. A drain pipe 303 is located on the lower right side of each chamber, connected to a valve. Opening this valve allows the upper layer of crude oil to be discharged from the chamber.

[0061] The upper left side of the last-stage chamber is equipped with an oil level detection component 7 connected to the liquid. The oil level detection component 7 is a digital display fluorescent water-oil sensor that can directly detect the degree of water-oil separation. The sensor includes a fluorescent water-oil sensor 701 and a float 702. The float 702 ensures that the sample detected by the sensor always comes from the upper layer of solution.

[0062] The oil level detection component 7 adopts a float design, which allows it to float with changes in solution volume, ensuring that the sensor detects samples from the upper layer of the solution.

[0063] Among them, the fluorescent water oil sensor 701 is a portable digital display sensor with a self-cleaning function.

[0064] Generally, the digital fluorescent oil-water sensor 701 detects an oil content of ≤0.5mg / L, indicating that the crude oil and brine are completely separated. If the reading is ≥0.5mg / L, it is discharged through the lower right pipe and then circulated for separation until the requirement is met.

[0065] This device uses a fluorescent oil-in-water sensor to detect crude oil in the separated brine. Based on the detection results, it can achieve repeated oil-water separation through circulation. This device integrates separation and detection, ensuring complete separation of crude oil and brine.

[0066] Furthermore, the main body of the gravity separation device 3 is made of transparent material, and the volume of each box is not less than 2L, with graduation lines on each box.

[0067] As an optional implementation, the brine collection device 4 includes a brine collection tank 405, a pressure sensor 401 connected inside the brine collection tank 405, a miniature vacuum pump 402 connected to the brine collection tank 405 through a vacuum pump valve 403, and a brine collection tank connected to the brine collection tank through a drain valve 404.

[0068] As an optional implementation, the bottom cross section of the inverted conical liquid collection tank 204 is an upwardly convex arc.

[0069] The bottom of the ultrasonic separation device 2 is convex in the middle and low on both sides, which is conducive to the discharge of the separated solution to the drain port and the gravity separation device.

[0070] The brine collection device 4 is equipped with a connecting pipe that communicates with the separation chamber 301 at the bottom of the gravity separation device 3. A second connecting valve 6 is located on the connecting pipe. Opening the second connecting valve 6 allows the separated brine to enter the brine collection device 4. The brine collection device 4 contains a pressure sensor 401 and a miniature vacuum pump 402 on its upper side. Activating the miniature vacuum pump 402 reduces the pressure in the chamber, allowing the separated brine to enter. The brine collection device 4 has a vent on its upper side and a connecting pipe on its lower side. A drain valve 404 is located on the connecting pipe. Opening the vent and drain valve 404 allows the separated brine to flow out of the collection device.

[0071] The brine collection device 4 is made of transparent material, and the box is marked with graduation lines. Its volume is not less than 2L.

[0072] When separating an oil-water mixture, first close the first valve 202 and the second valve 203 at the bottom of the ultrasonic separation device 2. Slowly add the oil-water mixture into the filter separation device 1 and the main body of the ultrasonic separation device 2. After the oil-water mixture passes through the filter screen 102, turn on the ultrasonic oil-water separation integrated system 201 and adjust the ultrasonic frequency to ≤30kHz and the sound intensity to ≥6W / cm. 2 Perform ultrasonic separation until oil and water show obvious stratification. Open the upper vent of the primary chamber of gravity separator 3 and close the valve of the connecting pipe between chambers. Open the second valve 203 to allow the supernatant to flow into gravity separator 3 until the oil-water stratification boundary is reached. Close the second valve 203 at the bottom of ultrasonic separator 2 that is connected to gravity separator 3. Open the first valve 202 at the bottom drain port of ultrasonic separator 2 to allow the separated crude oil to be discharged.

[0073] The solution is allowed to stand in the primary chamber of gravity separation device 3 until a clear oil-water stratification occurs. The first connecting valve 5 between the chambers and the vent of the secondary chamber are then opened, allowing the separated brine to enter the secondary chamber for further secondary gravity separation. The separated crude oil is discharged through the drain port of the primary chamber. This multi-stage gravity separation is repeated in each chamber until the separated liquid enters the tertiary chamber. The fluorescent oil-water sensor 701 detects the oil content of the solution. If the oil content detected by the sensor is ≥0.5 mg / L, the drain port on the bottom of the tertiary chamber is opened to drain the solution, and the separation process is repeated. If the oil content detected by the fluorescent oil-water sensor 701 is ≤0.5 mg / L, the connecting valve between gravity separation device 3 and brine collection device 4 is opened, the vent of brine collection device 4 is closed, and the micro vacuum pump 402 is turned on. When the pressure sensor 401 digitally displays the expected pressure, all the separated brine is allowed to enter the brine collection device 4. Open the vent of the brine collection device 4 and the bottom drain valve 404, and the separated brine will flow out from the brine collection device 4.

[0074] This experimental apparatus integrates a digital pressure sensor, a digital oil-in-water sensor, and an ultrasonic oil-water separation system. The ultrasonic system and the oil-in-water sensor are self-cleaning, and the filter and multi-stage gravity separation chamber are detachable. This experimental apparatus is intuitive, simple, easy to operate, and has good repeatability; it is also easy for technicians to learn and master.

[0075] Application Case Analysis:

[0076] Using a simple experimental setup for multi-stage oil-water separation from oilfield brine, and taking a laboratory-prepared oil-water mixture as the research object, an oil-water separation experiment was conducted. The specific steps are as follows:

[0077] 1) Thoroughly mix 1.5L of brine with 0.5L of pure crude oil to form a 2L oil-water mixture. Close all valves and vents of the experimental apparatus.

[0078] 2) Slowly pour the oil-water mixture into the main body of the separation device and the ultrasonic separation device. After it has completely passed through the filter, turn on the ultrasonic oil-water separation integrated system 201, set the ultrasonic frequency to 20kHz and the sound intensity to 7.15W / cm2. When the oil and water clearly separate after 45 minutes of ultrasonic radiation, turn off the ultrasonic oil-water separation integrated system 201. After standing for 5 minutes, open the connecting valves of the ultrasonic separation device and the gravity separation device, and open the vent of the first-stage tank of the gravity separation device to allow the solution to enter the first-stage tank until the oil and water interface is reached. Then, close the connecting valves of the ultrasonic separation device and the gravity separation device, and open the drain valve to discharge the upper crude oil solution.

[0079] 3) After the solution has been allowed to stand in the primary tank of the gravity separation device for 12 hours and obvious oil-water separation has occurred, open the bottom valve of the primary tank and the vent of the secondary tank to allow the separated brine solution to flow into the secondary tank until the oil-water separation interface is reached. Then close the bottom valve of the primary tank and open the bottom valve of the primary tank to discharge the upper crude oil solution. The solution is then allowed to stand in the secondary tank for another 12 hours to continue separation. The above operation is repeated. After the separated brine flows into the tertiary tank, the fluorescent water-oil sensor is turned on. The test shows that the oil content is 0.1 mg / L, which meets the requirements.

[0080] 4) Turn on the miniature vacuum pump. When the pressure sensor digital display reaches the expected pressure, open the valve on the connection between the brine collection device and the gravity separation device to allow the separated brine solution to flow completely into the collection device. Open the vent and bottom valve of the collection device to allow the separated brine to flow out of the collection device. A total of 1.38L of brine was separated.

[0081] 5) Test the mass density, pH, and Ca of the separated brine. 2+ The geochemical parameters of Mn, V, Al, Pb, Ni, and Cu are detailed in Table 1. The results show that the error in the properties of the brine before and after separation is within 20%.

[0082] Table 1 Comparison of brine properties before and after separation (unit: mg / L)

[0083] mass density pH <![CDATA[Ca 2+ ]]> Mn V Al Pb Ni Cu Before separation (ZS02) 1.02 6.73 1172 0.71 0.37 ND ND 0.016 ND After separation (SY06) 1.01 6.98 1023 0.81 0.31 0.021 ND ND ND error(%) 1 3.7 12.7 12.3 16.2 — — — —

[0084] Note: ND indicates below the detection limit.

[0085] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0086] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An experimental apparatus for separating oil and water in oilfield brine, characterized in that, include: The filter separation device (1), ultrasonic separation device (2), gravity separation device (3) and brine collection device (4) are connected in sequence. The filtration and separation device (1) is equipped with a filtration component, which is used for preliminary oil-water separation; The ultrasonic separation device (2) is equipped with an ultrasonic oil-water separation integrated system (201). The ultrasonic oil-water separation integrated system (201) separates the oil-water mixture into crude oil in the upper layer and oily brine in the lower layer. The ultrasonic separation device (2) is provided with two drain ports. One drain port is connected to the inlet of the gravity separation device (3) so that the oily brine enters the gravity separation device (3). The other drain port is used for crude oil discharge. The gravity separation device (3) is used for gravity separation of oil and brine in the oily brine, wherein the separated brine enters the brine collection device (4).

2. The experimental apparatus for oil-water separation of oilfield brine according to claim 1, characterized in that: The filtration and separation device (1) includes a funnel-shaped inlet tank (103), the bottom of which is connected to the top of the ultrasonic separation device (2), and the filtration assembly is located inside the funnel-shaped inlet tank (103).

3. The oil-water separation experimental apparatus for oilfield brine according to claim 2, characterized in that: The filter assembly includes a base (101) which is fixed to the inner wall of the funnel-shaped liquid inlet tank (103). The base (101) and the funnel-shaped liquid inlet tank (103) are coaxially arranged. A filter screen (102) is placed on the base (101).

4. The experimental apparatus for oil-water separation of oilfield brine according to claim 2, characterized in that: The ultrasonic separation device (2) includes an inverted conical liquid collection tank (204), the top of which is connected to the bottom of the funnel-shaped liquid inlet tank (103). The ultrasonic oil-water separation integrated system (201) is connected to the side wall of the inverted conical liquid collection tank (204). One side of the bottom of the inverted conical liquid collection tank (204) is connected to the crude oil collection tank through a first valve (202), and the other side of the bottom of the inverted conical liquid collection tank (204) is connected to the gravity separation device (3) through a second valve (203).

5. The oil-water separation experimental apparatus for oilfield brine according to claim 4, characterized in that: The gravity separation device (3) includes several sequentially connected separation boxes (301), and two adjacent separation boxes (301) are connected by a first connecting valve (5). The separation chamber (301) is connected to an exhaust section and a drainage section; The liquid inlet of the separation box (301) located at the top is connected to the bottom of the inverted conical liquid collection tank (204) through the second valve (203); The liquid outlet of the separation box (301) located at the bottom is connected to the brine collection device (4) through the second connecting valve (6); An oil level detection component (7) is provided inside the separation chamber (301) located at the bottom.

6. The experimental apparatus for oil-water separation of oilfield brine according to claim 5, characterized in that: The exhaust section includes an exhaust pipe (302), which is connected to the top of the separation box (301), and a valve is connected to the exhaust pipe (302).

7. The experimental apparatus for oil-water separation of oilfield brine according to claim 5, characterized in that: The drainage section includes a drainage pipe (303), which is connected to the bottom of the separation box (301), and a valve is connected to the drainage pipe (303).

8. The oil-water separation experimental apparatus for oilfield brine according to claim 6, characterized in that: The oil quantity detection component (7) includes a float (702) and a fluorescent water oil sensor (701) fixed on the float (702).

9. The experimental apparatus for oil-water separation of oilfield brine according to claim 1, characterized in that: The brine collection device (4) includes a brine collection tank (405), a pressure sensor (401) is connected inside the brine collection tank (405), a miniature vacuum pump (402) is connected to the brine collection tank (405) through a vacuum pump valve (403), and a brine collection tank is connected to the brine collection tank through a drain valve (404).

10. An oilfield brine oil-water separation experimental apparatus according to claim 4, characterized in that: The bottom cross section of the inverted conical liquid collection tank (204) is an upwardly convex arc.

Images