Thickened oil produced water deoiling device suitable for falling film evaporator

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a device suitable for removing oil from thick oil produced water of a falling film evaporator. The oil removal device for the thickened oil produced water comprises an oil removal shell, a fluid inlet pipe is arranged at the lower end of the oil removal shell, and an oil discharge outlet is formed in the upper portion of the oil removal shell; the oil removal drainage pipe is coaxially and fixedly connected with the oil removal shell, and the lower end of the oil removal drainage pipe extends into the oil removal shell; the rotational flow plate is coaxially and fixedly arranged in the oil removal shell and is positioned below the oil removal drain pipe; thickened oil produced water enters the oil removal shell from the fluid inlet pipe and generates rotational flow after passing through the rotational flow plate, an oil phase and a water phase in the thickened oil produced water are separated in the rotational flow process, the oil phase is located on the outer side of the water phase, the water phase is discharged upwards from the oil removal water discharge pipe, and the oil phase is discharged from the oil discharge outlet. The method is suitable for thickened oil produced water, and the maintenance period of equipment is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to an oil removal device for heavy oil produced water applicable to a falling film evaporator. Background Art

[0002] A large amount of wastewater generated from heavy oil thermal recovery in oilfields must be separated before it can be recycled. There are many methods for recycling, mainly membrane method and thermal method. These two methods are applied both at home and abroad. Relevant engineering examples have been partially applied in Canada, the United States, the United Kingdom, etc. However, since most oil production abroad is in the low water cut period, the amount of remaining sewage is small, so this technology has not been widely used in the oilfield field.

[0003] There are many problems in the adaptability and operation of the membrane method process and the conventional thermal method process for treating oilfield sewage. Therefore, it is necessary to optimize the treatment process and shorten the process flow.

[0004] The membrane method process refers to filtering water using a membrane made of special materials. The main disadvantages are as follows: 1. High requirements for influent water quality, and complex pretreatment processes are required for oilfield sewage to meet the requirements; 2. Short membrane service life, and the membrane needs to be replaced every 3 - 5 years, with high costs and large maintenance workload; 3. For oilfield sewage, the concentration multiple is low, and a large amount of concentrated water needs to be discharged; 4. It is extremely easy to be polluted. If the influent water quality does not meet the standard, it may cause membrane damage; 5. High reverse osmosis operating pressure, with the working pressure at 10 - 20 MPa, high energy consumption; 6. It is difficult to remove small molecule organic substances, and the effluent water quality is poor; 7. The temperature of oilfield sewage is relatively high, especially heavy oil sewage, and it needs to be cooled before membrane treatment.

[0005] The disadvantages of the conventional thermal method are as follows: 1. Forced circulation evaporation requires about 300 times the circulating water volume, with high energy consumption and large equipment; 2. The multi-effect evaporation process requires a steam source, and at the same time, the temperature difference is small, the heat transfer efficiency is low, the heat transfer area is large, the equipment volume is large, and the investment is high.

[0006] When the influent is heavy oil produced water and the produced water is required to meet the boiler water demand, the present invention can shorten the process and extend the maintenance period, and finally achieve a more economical and environmentally friendly effect. Summary of the Invention

[0007] Aiming at the above-mentioned technical problems, the present invention aims to provide an oil removal device for heavy oil produced water, which can be applicable to heavy oil produced water and extend the maintenance period of the equipment.

[0008] According to the present invention, there is provided an oil removal device for heavy oil produced water, comprising:

[0009] An oil removal housing, a fluid inlet pipe is provided at the lower end of the oil removal housing, and an oil discharge port is provided at the upper part of the oil removal housing;

[0010] An oil removal drain pipe fixedly connected coaxially with the oil removal housing, with the lower end of the oil removal drain pipe extending into the interior of the oil removal housing;

[0011] A swirl plate coaxially and fixedly arranged inside the oil removal housing, with the swirl plate located below the oil removal drain pipe;

[0012] The viscous oil produced water enters the oil removal housing from the fluid inlet pipe, swirls after passing through the swirl plate, the oil phase and the water phase in the viscous oil produced water are separated during the swirling process, and the oil phase is located outside the water phase. The water phase is discharged upward from the oil removal drain pipe, and the oil phase is discharged from the oil discharge port.

[0013] In a preferred embodiment, a fluid acceleration mechanism is arranged inside the oil removal housing, and the fluid acceleration mechanism is arranged below the swirl plate.

[0014] In a preferred embodiment, a hydrophobic corrugated plate is arranged vertically inside the oil removal housing, and the hydrophobic corrugated plate is located between the swirl plate and the oil discharge port.

[0015] In a preferred embodiment, a plurality of the swirl plates are arranged at intervals and evenly in the circumferential direction inside the oil removal housing.

[0016] In a preferred embodiment, one side of each swirl plate is in contact with the inner wall of the oil removal housing, and the other side of each swirl plate is in contact with the outer wall of the oil removal drain pipe.

[0017] In a preferred embodiment, the swirl plate includes a blind plate, and a plurality of swirl vanes are evenly arranged in the circumferential direction on the side surface of the blind plate.

[0018] In a preferred embodiment, one end of each swirl vane far from the blind plate is fixedly connected to the oil removal housing.

[0019] In a preferred embodiment, the fluid acceleration mechanism includes a motor and an impeller. The impeller is arranged inside the oil removal housing, and the motor drives the impeller to rotate, thereby accelerating the flow rate of the fluid.

[0020] In a preferred embodiment, the motor is arranged outside the oil removal housing, and the output shaft of the motor extends into the interior of the oil removal housing and is connected to the impeller.

[0021] In a preferred embodiment, the oil removal housing includes a cylindrical shell and conical shells arranged at both axial ends of the cylindrical shell. The hydrophobic corrugated plate, the swirl plate and the fluid acceleration mechanism are all arranged within the range of the cylindrical shell.

[0022] Compared with the prior art, the advantages of the present application are as follows:

[0023] In the present invention, the heavy oil produced water flowing out of the falling film evaporator is subjected to oil-water separation. The separated oil phase in the heavy oil produced water is directly discharged, and the separated water phase in the heavy oil produced water is reused again. Through this arrangement, even if the oil phase in the heavy oil produced water is discharged, the oil phase contains various corrosive and scale-forming substances, thereby extending the maintenance cycle of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described below with reference to the accompanying drawings.

[0025] Figure 1 FIG. shows a schematic diagram of an embodiment of an apparatus for removing oil from heavy oil produced water according to the present invention;

[0026] Figure 2 FIG. shows a schematic diagram of an embodiment of a swirl plate according to the present invention;

[0027] Figure 3 FIG. shows a schematic diagram of an embodiment of an impeller according to the present invention.

[0028] In the figure:

[0029] 200, apparatus for removing oil from heavy oil produced water; 201, oil removal housing; 202, oil removal drain pipe; 204, fluid inlet pipe; 205, oil discharge port; 206, hydrophobic corrugated plate; 207, cylindrical shell; 208, conical shell;

[0030] 21, fluid acceleration mechanism; 211, motor; 212, impeller;

[0031] 22, swirl plate; 221, blind plate; 222, swirl vanes.

[0032] In the present application, all the drawings are schematic drawings, which are only used to illustrate the principle of the present invention and are not drawn to actual scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be introduced below with reference to the accompanying drawings.

[0034] It should be noted that the directional terms or qualifiers "up", "down", etc. used in the present application are all with reference to the Figure 1 It does not limit the absolute position of the components involved, but can vary according to specific circumstances.

[0035] Embodiment 1:

[0036] Figure 1 FIG. shows the structure of the apparatus 200 for removing oil from heavy oil produced water according to the present invention. As Figure 1As shown, the heavy oil produced water oil removal device 200 includes a heavy oil produced water oil removal device, which includes an oil removal housing 201, a fluid inlet pipe 204, an oil removal drain pipe 202, and a swirl plate 22.

[0037] Among them, the fluid inlet pipe 204 is coaxially and fixedly arranged at the lower end of the oil removal housing 201. Specifically, the upper end of the fluid inlet pipe 204 contacts the lower end of the oil removal housing 201.

[0038] The oil drain port 205 is arranged at the upper part of the oil removal housing 201.

[0039] The oil removal drain pipe 202 is coaxially and fixedly arranged at the upper part of the oil removal housing 201. Specifically, the lower end of the oil removal drain pipe 202 extends into the interior of the oil removal housing 201, and the upper end of the oil removal drain pipe 202 extends outside the oil removal housing 201. Further, the height of the oil drain port 205 is higher than the lower end of the oil removal drain pipe 202.

[0040] The swirl plate 22 is coaxially and fixedly arranged inside the oil removal housing 201, and the swirl plate 22 is located below the oil removal drain pipe 202.

[0041] The heavy oil produced water enters the oil removal housing 201 from bottom to top along the fluid inlet pipe 204, then passes through the swirl plate 22, and swirls under the action of the swirl plate 22. The oil phase and water phase in the heavy oil produced water are separated during the swirling process. Since the density of the oil phase in the heavy oil produced water is greater than that of the water phase, the oil phase is located outside the water phase. The water phase is discharged upward from the oil removal drain pipe 202, and the oil phase is discharged from the oil drain port 205.

[0042] In a specific embodiment, the swirl plate 22 includes a blind plate 221, and a plurality of swirl vanes 222 are uniformly arranged along the circumferential direction on the side surface of the blind plate 221. As Figure 2 shown, the blind plate 221 is arranged in a cylindrical shape for supporting each swirl vane 222. One end of each swirl vane 222 away from the blind plate 221 is fixedly connected to the oil removal housing 201. Preferably, the swirl vane 222 forms an acute angle of 30° with the horizontal plane, and the included angle between the swirl vane 222 extending outward obliquely and the tangent direction of the oil removal housing 201 is 60°.

[0043] In a preferred embodiment, a fluid acceleration mechanism 21 is arranged inside the oil removal housing 201, and the fluid acceleration mechanism 21 is arranged below the swirl plate 22. The fluid acceleration mechanism 21 can accelerate the heavy oil produced water entering the oil removal housing 201, so that the heavy oil produced water can have a greater swirl speed through the fluid acceleration mechanism 21, and the water phase and oil phase in the heavy oil produced water can be separated faster.

[0044] In a specific embodiment, the fluid acceleration mechanism 21 includes a motor 211 and an impeller 212. The impeller 212 is disposed inside the oil removal housing 201, and the motor 211 drives the impeller 212 to rotate, thereby accelerating the flow rate of the fluid.

[0045] The motor 211 is disposed outside the oil removal housing 201. The output shaft of the motor 211 extends into the interior of the oil removal housing 201 and is connected to the impeller 212. With this arrangement, the motor 211 is prevented from coming into contact with the viscous oil produced water inside the oil removal housing 201, thereby extending the service life of the motor 211.

[0046] In a preferred embodiment, a plurality of fluid acceleration mechanisms 21 may be disposed inside the oil removal housing 201. The plurality of fluid acceleration mechanisms 21 are evenly arranged at intervals in the circumferential direction inside the oil removal housing 201. When the plurality of fluid acceleration mechanisms 21 are started together, the flow velocity of the fluid can be further increased.

[0047] According to the present invention, in a preferred embodiment, a hydrophobic corrugated plate 206 is disposed vertically inside the oil removal housing 201. The hydrophobic corrugated plate 206 is located between the swirl plate 22 and the oil discharge port 205. Further, a plurality of swirl plates 22 are evenly arranged at intervals in the circumferential direction inside the oil removal housing 201. One side of each swirl plate 22 contacts the inner wall of the oil removal housing 201, and the other side of each swirl plate 22 contacts the outer wall of the oil removal drain pipe 202. During the process in which the viscous oil produced water flowing upward in a swirling posture after passing through the swirl plate 22, it will collide violently with the swirl plate 22, further promoting the separation of the water phase and the oil phase in the viscous oil produced water.

[0048] As Figure 1 shown, the oil removal housing 201 includes a cylindrical shell 207 and conical shells 208 provided at both axial ends of the cylindrical shell 207. The hydrophobic corrugated plate 206, the swirl plate 22, and the fluid acceleration mechanism 21 are all disposed within the range of the cylindrical shell 207. The oil discharge port 205 is provided on the conical shell 208 above the cylindrical shell 207, and the lower end of the oil removal drain pipe 202 extends into the length range of the cylindrical shell 207.

[0049] Embodiment Two:

[0050] In an embodiment of the present invention, a process for treating viscous oil produced water is provided, which is characterized by including the following steps: Step S1, making the viscous oil produced water flow in a film along the evaporation tube from top to bottom, and heating the evaporation tube to evaporate the water phase in the viscous oil produced water into first water vapor; Step S2, collecting the first water vapor and performing purification treatment on it.

[0051] In a specific embodiment, the present invention further provides a treatment device for implementing the heavy oil produced water treatment process. The treatment device includes an evaporation chamber and a separation chamber provided downstream of the evaporation chamber. The evaporation chamber specifically includes a housing and a plurality of evaporation tubes evenly distributed inside the housing. The heavy oil produced water flows downward from top to bottom inside the evaporation tubes and forms a film on the inner wall of the evaporation tubes, thereby increasing the heating area of the heavy oil produced water and reducing energy consumption. After passing through the evaporation tubes, the heavy oil produced water enters the separation chamber. Inside the separation chamber, the water phase in the heavy oil produced water becomes the first steam, which is discharged from the steam outlet of the separation chamber and enters the scrubbing tower for steam purification treatment.

[0052] According to the present invention, in step S1, the evaporation tubes are heated by means of steam heating.

[0053] Furthermore, the first steam after being purified in step S2 is used to heat the evaporation tubes. That is to say, after the first steam undergoes steam purification treatment in the scrubbing tower, it then enters the space between the housing and the evaporation tubes of the evaporation chamber, thereby realizing the recycling of heat and reducing energy consumption.

[0054] Furthermore, after the first steam heats the evaporation tubes, part of it enters the distilled water tank to form distilled water, and the other part exchanges heat with the heavy oil produced water to be treated. In this embodiment, the heavy oil produced water to be treated passes through the separation chamber in the treatment device provided by the present invention. Before the heavy oil produced water to be treated enters the separation chamber, it first exchanges heat with the first steam to preheat and increase the temperature, thereby reducing energy consumption.

[0055] Furthermore, the present invention also uses the distilled water in the distilled water tank to exchange heat with the heavy oil produced water. Before the heavy oil produced water to be treated enters the separation chamber, it exchanges heat with the distilled water in the distilled water tank to preheat and increase the temperature, thereby reducing energy consumption.

[0056] Subsequently, the first steam and part of the distilled water after heat exchange are discharged into a steam-water separation tank for steam-water separation, and the other part of the distilled water is directly discharged.

[0057] In a preferred embodiment, in step S1, before the heavy oil produced water enters the evaporation tubes, oil removal treatment is performed.

[0058] Specifically, the separation chamber of the present invention is used to receive the viscous oil produced water to be treated and the viscous oil produced liquid after being heated by the evaporation tubes. The lower end of the separation chamber is connected above the evaporation tubes through a circulation pump, and between the lower end of the separation chamber and the upper end of the evaporation tubes, there is provided an oil removal device 200 for viscous oil produced water as provided in the first embodiment. Specifically, the lower end of the separation chamber is connected to the fluid inlet pipe 204 of the oil removal device 200 for viscous oil produced water, and the upper end of the evaporation tubes is connected to the oil removal drain pipe 202 of the oil removal device 200 for viscous oil produced water. The viscous oil produced water to be treated in the separation chamber (equivalent to the concentrated liquid in the first embodiment) passes through the oil removal device 200 for viscous oil produced water under the action of the circulation pump. The oil removal device 200 for viscous oil produced water separates the oil phase in the viscous oil produced water, and the separated oil phase is directly discharged after passing through the oil removal device 200 for viscous oil produced water. After the oil phase in the viscous oil produced water is separated, the remaining water phase part reaches the upper part of the evaporation chamber and then enters the evaporation tubes, corresponding to the above step S1.

[0059] The oil removal device 200 for viscous oil produced water of the present invention can preliminarily remove oil from the viscous oil produced water in advance, removing most of the impurities in the viscous oil produced water in advance, thereby reducing the corrosion degree of the evaporation tubes or the scaling rate on the inner wall of the evaporation tubes when the viscous oil produced water enters the evaporation tubes.

[0060] In a specific embodiment according to the present invention, the specific process flow of the viscous oil produced water treatment process is as follows.

[0061] The treatment device further includes a stock solution tank for storing the viscous oil produced liquid to be treated.

[0062] The stock solution tank and the separation chamber are connected through pipelines, and the viscous oil produced water in the stock solution tank can enter the separation chamber through the pipelines. There are also two heat exchangers provided on the pipelines between the stock solution tank and the separation chamber. The water vapor after heating the evaporation tubes and the distilled water in the distilled water tank are respectively connected to the above two heat exchangers, and the water vapor after heating the evaporation tubes is downstream of the distilled water in the distilled water tank. That is to say, after the viscous oil produced water flows out of the stock solution tank, it is preheated by the water vapor and then by the distilled water in sequence, and then enters the separation chamber.

[0063] Specifically, the viscous oil produced water in the stock solution tank enters the separation chamber from the side wall of the separation chamber.

[0064] In a specific embodiment, the temperature of the viscous oil produced water in the stock solution tank is 40 - 50 degrees Celsius, and the flow rate range of the viscous oil produced water flowing from the stock solution tank to the separation chamber is 2.5 - 3.5m 3 / h. The temperature range of the viscous oil produced water after being preheated by the water vapor is 60 - 70 degrees Celsius, and the temperature range of the viscous oil produced water after being preheated by the distilled water is 75 - 85 degrees Celsius.

[0065] The bottom of the separation chamber is connected to the top of the evaporation chamber through a pipeline. Moreover, an oil removal device is provided on the pipeline between the separation chamber and the evaporation chamber. The oil removal device can separate the oil phase from the produced heavy oil water. After the oil phase in the produced heavy oil water is separated, a concentrated liquid is discharged. The other fluids in the produced heavy oil water except the oil removal phase flow to the evaporation chamber, enter from the upper end of the evaporation chamber, and finally flow in a film from top to bottom on the inner wall of the evaporation tube in the evaporation chamber. The film flow of the produced heavy oil water can increase the contact area, and only a small amount of heat is required to heat it.

[0066] In a specific embodiment, the temperature range at the bottom of the separation chamber is 70 to 80 degrees Celsius.

[0067] In a specific embodiment, the flow rate of the oil phase separated by the oil removal device is 0.3 to 0.5 m 3 / h.

[0068] Steam for heating the evaporation tube is provided between the inner part of the outer shell of the evaporation chamber and the outside of the evaporation tube. In this embodiment, this part of the steam has two sources. One source is that the treatment device of the present invention is provided with a steam generator, and the steam generator can continuously generate steam and introduce it into the inside from the outer shell of the evaporation chamber; the other source is the steam generated after the treatment device treats the produced heavy oil water. The steam generated by the treatment device treating the produced heavy oil water is also introduced into the inside from the outer shell of the evaporation chamber. Through this setting, using steam to heat the evaporation tube can achieve rapid and uniform heating of the entire evaporation tube. At the same time, it can make full use of energy and reduce energy consumption.

[0069] In a preferred embodiment, a first swirling device is provided in the evaporation tube. The first swirling device can make the produced heavy oil water flowing in a film in the evaporation tube swirl, strengthen the scouring force on the inner wall of the evaporation tube, prevent impurities from sticking to the inner wall of the evaporation tube, reduce the cleaning of the inner wall of the evaporation tube, and thus reduce the equipment maintenance funds.

[0070] After the produced heavy oil water is heated in the evaporation tube, it continues to flow downward and then enters the separation chamber. After the produced heavy oil water is heated, the water phase in it is evaporated to form steam. The treatment device provided by the present invention further includes a scrubbing tower. The scrubbing tower is connected to the side wall of the separation chamber through a pipeline. The steam in the separation chamber can enter the scrubbing tower along the pipeline. The scrubbing tower can purify the steam, thereby removing the impurities doped in the steam and making the purity of the steam reach the level that can be directly used as boiler water.

[0071] In a specific embodiment, the temperature range of the steam entering the scrubbing tower from the separation chamber is 85 to 95 degrees Celsius.

[0072] In a preferred embodiment, a second cyclone device is provided inside the separation chamber. After the viscous oil produced water flowing out of the evaporation pipe enters the separation chamber, it swirls under the action of the second cyclone device, which can accelerate the evaporation of the water phase in the viscous oil produced water.

[0073] Part of the water vapor purified by the scrubbing tower is discharged back into the separation chamber to ensure that the temperature of the separation chamber is maintained at a specific level, and at the same time, it is beneficial to the evaporation of the viscous oil produced water in the separation chamber to form new water vapor. Another part of the water vapor purified by the scrubbing tower enters the interior of the outer shell of the evaporation chamber through the pipeline, thereby heating the evaporation pipe.

[0074] In a preferred embodiment, a steam compressor is provided on the pipeline between the scrubbing tower and the evaporation chamber. The steam compressor can compress the water vapor, increase the temperature and pressure of the water vapor, which is more beneficial to the flow of the water vapor and the heating of the evaporation pipe.

[0075] In a specific embodiment, the temperature range of the water vapor after passing through the steam compressor is 95 - 105 degrees Celsius.

[0076] A water vapor outlet is provided on the side wall of the outer shell of the evaporation chamber. Further, a water vapor outlet is provided above and below the water vapor inlet respectively.

[0077] After the water vapor in the evaporation chamber flows out from the water vapor outlet, part of it passes through the heat exchanger along the pipeline to preheat the viscous oil produced water about to enter the separation chamber, and then enters the steam - water separation tank.

[0078] After the water vapor in the evaporation chamber flows out from the water vapor outlet, another part enters the distilled water tank along the pipeline to form distilled water. The distilled water in the distilled water tank flows out along the pipeline from the bottom of the distilled water tank. Part of it circulates back into the distilled water tank again to facilitate the formation of distilled water from water vapor; another part passes through the heat exchanger along the pipeline to preheat the viscous oil produced water about to enter the separation chamber.

[0079] The distilled water flowing out from the heat exchanger, part of it enters the steam - water separation tank along the pipeline and mixes with the water vapor in the steam - water separation tank; another part is directly discharged as condensate.

[0080] In a specific embodiment, the flow rate of the distilled water flowing through the heat exchanger is 2.5 - 3.5m 3 / h.

[0081] The viscous oil produced water treatment process provided by the present invention has many advantages compared with the existing membrane process and conventional thermal process.

[0082] Compared with the existing membrane process, the present invention has low requirements for water quality, can treat produced wastewater from heavy oil production with extremely harsh water quality, and has lower maintenance costs compared with the existing membrane process.

[0083] Compared with the existing conventional thermal process, the present invention consumes less energy. During actual use, the overall total power of the treatment device of the present invention can be controlled within 200 kw / h. In a specific embodiment, the total power of the treatment device of the present invention is 192.4 kw / h.

[0084] In an embodiment of the present invention, a scale inhibitor is provided, including: hydroxyethylidene diphosphonic acid, aminotrimethyl phosphonic acid, PBTCA, and polyaspartic acid.

[0085] In a specific embodiment provided by the present invention, the components of the scale inhibitor are proportioned by weight. Among them, 40 - 50 parts of hydroxyethylidene diphosphonic acid, 10 - 20 parts of aminotrimethyl phosphonic acid, 5 - 10 parts of PBTCA, and 5 - 10 parts of polyaspartic acid.

[0086] According to the water quality analysis results of produced wastewater from heavy oil production, it is judged that the scaling ions are cations such as calcium, magnesium, strontium, and anions such as sulfate and carbonate. The scale inhibitor provided by the present invention can reduce the scaling rate of produced wastewater from heavy oil production in a working environment of 60 - 105 degrees Celsius.

[0087] In this embodiment, the produced wastewater from heavy oil production and the scale inhibitor are respectively added to the separation chamber through different channels, and the addition amounts of the produced wastewater from heavy oil production and the scale inhibitor can be respectively adjusted. By adjusting the addition amounts of the produced wastewater from heavy oil production and the scale inhibitor, the concentration of the scale inhibitor in the produced wastewater from heavy oil production is adjusted.

[0088] A plurality of injection ports for adding the scale inhibitor are provided on the separation chamber. The plurality of injection ports are evenly distributed along the circumferential direction of the falling film evaporator, and the amount of the scale inhibitor is adjusted through the injection ports.

[0089] In a preferred embodiment, a flow meter for measuring the flow rate of the produced wastewater from heavy oil production is provided on the separation chamber.

[0090] Furthermore, the flow meter is arranged at the water injection port of the separation chamber to reduce the influence of the internal fluid of the separation chamber on the accuracy of flow detection.

[0091] In a preferred embodiment, the flow meter is an ultrasonic flow meter. Using an ultrasonic flow meter can detect the flow rate more accurately. On the one hand, it can adjust the amount of the produced wastewater from heavy oil production according to the processing capacity of the separation chamber, and on the other hand, it can adjust the addition amount of the scale inhibitor according to the amount of the produced wastewater from heavy oil production.

[0092] In a preferred embodiment, each liter of produced heavy oil wastewater corresponds to 6 - 9 mg of scale inhibitor.

[0093] The scale inhibitors in the prior art can only inhibit scale for a single substance. For example, if the scale inhibition rate for CaCO3 can reach 80%, it is very difficult for the scale inhibition rate of SrSO4 to reach 60%; on the premise that the scale inhibition rate for SrSO4 can reach 80%, the scale inhibition rate of CaCO3 is very difficult to exceed 50%.

[0094] It has been experimentally proven that according to the process flow of the present invention, under the temperature condition of 60 - 105 °C, the scale inhibition rate is above 85%. Specifically, in the actual operation process, each liter of produced heavy oil wastewater corresponds to the addition of 4 - 5 mg of hydroxyethylidene diphosphonic acid, 1 - 2 mg of aminotrimethyl phosphonic acid, 0.5 - 1 mg of PBTCA, and 0.5 - 1 mg of polyaspartic acid. After using the scale inhibitor of the present invention, the scale inhibition rate of CaCO3 is greater than 89.5%, and the scale inhibition rate of SrSO4 is greater than 87.8%.

[0095] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0096] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0098] Finally, it should be noted that the above are only the preferred embodiments of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil removal device for heavy oil produced water, characterized in that, Comprising: An oil removal housing (201), a fluid inlet pipe (204) is provided at the lower end of the oil removal housing (201), and an oil discharge port (205) is provided at the upper part of the oil removal housing (201); An oil removal drain pipe (202) fixedly connected coaxially with the oil removal housing (201), the lower end of the oil removal drain pipe (202) extends into the interior of the oil removal housing (201); A swirl plate (22) fixedly arranged coaxially in the oil removal housing (201), the swirl plate (22) is located below the oil removal drain pipe (202); The viscous oil produced water enters the oil removal housing (201) from the fluid inlet pipe (204), swirls after passing through the swirl plate (22), the oil phase and the water phase in the viscous oil produced water are separated during the swirling process, and the oil phase is located outside the water phase, and the water phase is discharged upward from the oil removal drain pipe (202), and the oil phase is discharged from the oil discharge port (205).

2. The oily wastewater removal device for viscous oil production water according to claim 1, wherein A fluid acceleration mechanism (21) is arranged in the oil removal housing (201), and the fluid acceleration mechanism (21) is arranged below the swirl plate (22).

3. The oil removal device for heavy oil produced water according to claim 2, characterized in that, A hydrophobic corrugated plate (206) is arranged vertically in the oil removal housing (201), and the hydrophobic corrugated plate (206) is located between the swirl plate (22) and the oil discharge port (205).

4. The oil removal device for heavy oil produced water according to claim 3, wherein, A plurality of the swirl plates (22) are arranged at intervals and evenly in the circumferential direction in the oil removal housing (201).

5. The oily wastewater treatment device for viscous oil produced water according to claim 4, characterized in that One side of each of the swirl plates (22) is in contact with the inner wall of the oil removal housing (201), and the other side of each of the swirl plates (22) is in contact with the outer wall of the oil removal drain pipe (202).

6. The oil removal device for heavy oil produced water according to claim 1, characterized in that, The swirl plate (22) includes a blind plate (221), and a plurality of swirl vanes (222) are evenly arranged in the circumferential direction on the side surface of the blind plate (221).

7. The oil removal device for heavy oil produced water according to claim 6, characterized in that, One end of each of the swirl vanes (222) far away from the blind plate (221) is fixedly connected to the oil removal housing (201).

8. The oil removal device for viscous oil produced water according to claim 2, characterized in that, The fluid acceleration mechanism (21) includes a motor (211) and an impeller (212), the impeller (212) is arranged inside the oil removal housing (201), and the motor (211) drives the impeller (212) to rotate, thereby accelerating the flow rate of the fluid.

9. The oil removal device for heavy oil produced water according to claim 8, characterized in that, The motor (211) is arranged outside the oil removal housing (201), and the output shaft of the motor (211) extends into the interior of the oil removal housing (201) and is connected to the impeller (212).

10. The oil removal device for heavy oil produced water according to claim 3, characterized in that, The oil removal housing (201) includes a cylindrical shell (207) and conical shells (208) arranged at both axial ends of the cylindrical shell (207), and the hydrophobic corrugated plate (206), the swirl plate (22) and the fluid acceleration mechanism (21) are all arranged within the range of the cylindrical shell (207).

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