Oilfield produced oily sewage pretreatment equipment

Abstract

The application discloses an oilfield produced oily sewage pretreatment equipment and relates to the technical field of sewage treatment. The equipment comprises a tank body unit, a tank body, an inlet opening arranged on one side of the tank body and used for connecting the incoming sewage, a discharge opening arranged on the other side of the tank body and used for discharging water, and a maintenance opening arranged on the tank body and used for maintaining and cleaning the inside of the tank body. The filter assembly is rotated by the impact force of the sewage, and the particulate matters and impurities in the sewage are intercepted, so that the particulate matters are separated. Meanwhile, the spraying assembly extracts the water in the tank body to flush the filter assembly, the impurities are removed, and the rotating speed of the filter assembly is accelerated. Meanwhile, the air injection assembly starts to deliver air to the tank body, so that air bubbles are generated at the bottom of the oily sewage, the air bubbles adsorb the oil and take the oil to the surface of the sewage, the separation process is accelerated, the oily sewage is divided by the separation assembly, the bottom sewage is discharged, and the oil at the top is collected, so that the oily sewage and the oil on the surface of the sewage are simultaneously collected and discharged.

Description

Technical Field

[0001] This invention relates to the technical field of wastewater treatment, and more particularly to a pretreatment device for oily wastewater produced from oil fields. Background Technology

[0002] During oilfield extraction, formation water is often present in the oil-bearing strata. When extracting crude oil, these formations...

[0003] Water is extracted to the surface along with crude oil. Since formation water is already in contact with crude oil, it dissolves and carries some crude oil components, thus forming oily wastewater.

[0004] Currently, most existing technologies for pre-treating oily wastewater from oilfields do not separate suspended solids or impurities from the wastewater. This results in the presence of solid particles in the oil after oil-water separation. Furthermore, the long waiting time for natural oil-water separation during wastewater treatment leads to a slow separation process and reduced efficiency. Summary of the Invention

[0005] In view of the problems existing in the pretreatment equipment for oily wastewater produced from oil fields, the present invention is proposed.

[0006] Therefore, the present invention provides an oilfield produced oily wastewater pretreatment device, the purpose of which is to solve the problems of the inability to separate solid suspended matter or impurities in oily wastewater, and the excessively long natural oil-water separation time during oily wastewater treatment, which leads to a slow oil-water separation process and affects the separation efficiency.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: comprising a tank unit and a filter unit for filtering solid particulate matter, characterized in that:

[0008] It also includes an oil separation unit, comprising a gas injection assembly disposed on the top of the tank for accelerating oil separation, a separation assembly disposed inside the gas injection assembly for separating the oil, and an adjustment assembly slidably disposed on the separation assembly for adjusting the oil separation. The adjustment assembly rises as the amount of oil inside the tank unit increases to ensure the best oil separation effect.

[0009] The air injection assembly includes a suction fan located at the top of the tank, L-shaped pipes located at both ends of the suction fan, and a blower located at the bottom of the L-shaped pipes, wherein the L-shaped pipes penetrate and are connected to the tank.

[0010] The separation assembly includes a first partition plate disposed inside the tank body, a second partition plate disposed inside the tank body, and a second interceptor plate disposed inside the tank body, wherein the second interceptor plate cooperates with the second partition plate.

[0011] A U-shaped guardrail is provided on one side of the second partition plate, and an oil drain pipe is provided on the U-shaped guardrail. The oil drain pipe runs through the tank and is fixedly connected to it.

[0012] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, the adjustment component includes an electric push rod disposed on the top of the tank, a U-shaped connecting rod disposed on the output end of the electric push rod, and a movable plate disposed on the bottom of the U-shaped connecting rod, wherein the movable plate is slidably connected inside the U-shaped plate, and the U-shaped connecting rod is slidably connected to the L-shaped pipe.

[0013] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, the top of the movable plate is provided with baffles.

[0014] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, the filtration unit includes a filtration component disposed inside the tank for intercepting solids inside the wastewater, and a spray component disposed on top of the filtration component for spraying and rinsing the filtration component.

[0015] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, the filter assembly includes an interceptor plate inside the tank body, a conveying pipe disposed inside the interceptor plate, and a rotatably disposed on the conveying pipe.

[0016] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, wherein: an intercepting cylinder is provided on the outer diameter of one side of the conveying pipe, and a baffle is provided on the intercepting cylinder, and the baffle cooperates with the spraying assembly.

[0017] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, an annular filter plate is provided inside one side of the conveying pipe, and a collection element is provided on the outer diameter of the conveying pipe, and the collection element is connected to the annular filter plate through it.

[0018] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, the spray assembly includes a water pump installed on the top of the tank, a water supply pipe installed at the output end of the water pump, and a spray element installed at the other end of the water supply pipe, wherein the spray element cooperates with a baffle and an interception cylinder.

[0019] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment described in this invention, the pump input end is provided with a conduit, the other end of the conduit is provided with an F-shaped pipe, and the F-shaped pipe runs through and connects to the tank.

[0020] As a preferred embodiment of the oilfield produced oily wastewater pretreatment equipment of the present invention, it includes: a tank, an inlet provided on one side of the tank for connecting wastewater, an outlet provided on the other side of the tank for draining water, and an inspection port provided on the tank for inspecting and cleaning the inside of the tank.

[0021] The beneficial effects of this invention are as follows: When treating oily wastewater, the impact force of the wastewater itself causes the filter assembly to rotate and intercept particulate matter and impurities in the wastewater, achieving particulate separation. Simultaneously, the spray assembly draws water from the tank to rinse the filter assembly, removing impurities and accelerating its rotation speed, further improving separation efficiency. Then, the filtered assembly and the separated oily wastewater are transported together to the separation unit. Because oil is less dense than water, the oily wastewater naturally separates and floats to the surface. At the same time, the air injection assembly begins to supply air to the tank, generating bubbles at the bottom of the oily wastewater. These bubbles adsorb oil and carry it to the surface, accelerating the separation process. The separation assembly divides the oily wastewater, discharging the bottom wastewater and collecting the top oil, thus simultaneously collecting and discharging both the wastewater and the oil on its surface. The assembly is dynamically adjusted to ensure efficient separation, improving separation efficiency, reducing impurity residue, and enhancing operational flexibility and adaptability. This effectively treats oily wastewater, achieving rapid and efficient separation and reducing resource waste and environmental pollution. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0024] Figure 2 This is a side view of the pretreatment equipment for oily wastewater produced from oilfields according to the present invention.

[0025] Figure 3 This is a schematic diagram of the internal structure of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0026] Figure 4 This is a cross-sectional structural schematic diagram of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0027] Figure 5 This is a schematic diagram of the filter component structure of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0028] Figure 6 This is a schematic cross-sectional view of the filter assembly of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0029] Figure 7 This invention relates to an oilfield produced oil wastewater pretreatment equipment. Figure 6 A magnified structural diagram at point A.

[0030] Figure 8 This is a schematic diagram of the oil-air injection component structure of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0031] Figure 9 This is a schematic cross-sectional view of the oil-air injection component of the oilfield produced oily wastewater pretreatment equipment of the present invention.

[0032] Figure 10 This invention relates to an oilfield produced oil wastewater pretreatment equipment. Figure 9 A magnified structural diagram at point B.

[0033] Explanation of reference numerals in the attached drawings: 100, Tank unit; 101, Tank; 102, Inspection port; 103, Inlet; 104, Outlet; 200, Filter unit; 201, Filter assembly; 2011, Interception plate one; 2012, Conveying pipe; 2013, Annular filter plate; 2014, Collector; 2015, Interception cylinder; 2016, Baffle; 202, Spray assembly; 2021, Water pump; 2022, Water supply pipe; 2023, Spray component; 2024, Conduit. ; 2025, F-type pipe; 300, oil-liquid separation unit; 301, air injection assembly; 3011, suction fan; 3012, L-type pipe; 3013, blower; 302, separation assembly; 3021, dividing plate one; 3022, dividing plate two; 3023, U-shaped baffle; 3024, oil drain pipe; 3025, intercepting plate two; 303, adjustment assembly; 3031, electric push rod; 3032, U-shaped connecting rod; 3033, moving plate; 3034, blocking tooth. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Example 1, referring to Figures 1-4 The first embodiment of the present invention provides an oilfield produced oily wastewater pretreatment device, which includes a tank unit 100, a filtration unit 200, and an oil-liquid separation unit 300.

[0036] The tank unit 100 includes a tank 101, an inlet 103 located on one side of the tank 101 for connecting to sewage, an outlet 104 located on the other side of the tank 101 for draining water, and an inspection port 102 located on the tank 101 for inspecting and cleaning the inside of the tank 101.

[0037] The filter unit 200 includes a filter assembly 201 disposed inside the tank 101 for intercepting solids inside the wastewater, and a spray assembly 202 disposed on the top of the filter assembly 201 for spraying and rinsing the filter assembly 201. The spray assembly 202 is connected to the bottom of the tank 101 to realize water recycling.

[0038] The oil separation unit 300 includes an air injection assembly 301 disposed on the top of the tank 101 for accelerating oil separation, a separation assembly 302 disposed inside the air injection assembly 301 for dividing the oil, and an adjustment assembly 303 slidably disposed on the separation assembly 302 for adjusting the oil separation. The adjustment assembly 303 cooperates with the separation assembly 302 to complete the oil separation operation.

[0039] When treating oily wastewater, the inlet 103 is first connected to the wastewater discharge outlet to transport the wastewater into the filter assembly 201. The impact force generated by the wastewater entering the filter assembly 201 causes it to rotate, intercepting particulate matter and impurities within the wastewater and separating the oil. The oily wastewater is then transported to the oil separation unit 300. Simultaneously, the spray assembly 202 works in conjunction with the filter assembly 201 to extract water from the tank 101, rinsing the surface of the filter assembly 201 and impacting the impurities and particulate matter adhering to the inner wall of the filter assembly 201 together for collection. During the rinsing process of the spray assembly 202, the impact of the wastewater inside the filter assembly 201 also accelerates its rotation speed, resulting in cleaner and faster separation of particulate matter within the wastewater. The water rinsed down by the spray assembly 202, along with the wastewater that has been separated from impurities, is then transported into the tank 101 for oil separation.

[0040] Because grease is less dense than water, the oil and wastewater automatically separate after entering the tank 101. Simultaneously, the air injection component 301 supplies air into the tank 101, generating bubbles at the bottom of the oily wastewater. These bubbles rise from the bottom, contacting and adsorbing the grease, bringing it to the surface. This allows for faster oil-water separation. Since grease is less dense than wastewater, it floats on the surface and is further separated by the separation component 302. The wastewater at the bottom is discharged into the tank 101, while the grease at the top is intercepted and collected. The adjustment component 303 adjusts the separation effect based on the amount of oily wastewater entering the tank 101, completing the oil-water separation. The separated wastewater exits through the outlet 104, while the separated grease exits from the separation component 302, thus completing the oil-water separation process.

[0041] During use, when treating oily wastewater, the inlet 103 is first connected to the wastewater discharge outlet to transport the wastewater into the filter assembly 201. The impact force generated by the wastewater entering the filter assembly 201 causes it to rotate, intercepting particulate matter and impurities within the wastewater and separating the oil. The oily wastewater is then transported to the oil separation unit 300. Simultaneously, the spray assembly 202 works in conjunction with the filter assembly 201 to extract water from the tank 101, rinsing the surface of the filter assembly 201 and impacting the impurities and particulate matter adhering to the inner wall of the filter assembly 201 together for collection. During the rinsing process of the spray assembly 202, the impact of the wastewater inside the filter assembly 201 also accelerates its rotation speed, resulting in cleaner and faster separation of particulate matter within the wastewater. The water rinsed down by the spray assembly 202, along with the wastewater that has been separated from impurities, is then transported into the tank 101 for oil separation.

[0042] Because grease is less dense than water, the oil and water automatically separate after the oily wastewater is transported into tank 101. Simultaneously, the air injection component 301 supplies air into tank 101, generating bubbles at the bottom of the oily wastewater. These bubbles rise from the bottom, contacting and adsorbing the grease, bringing it to the surface. This allows for faster oil-water separation, and because grease is less dense than wastewater, it floats on the surface. Furthermore, the oily wastewater is separated by the separation component 302, so that the wastewater at the bottom is discharged and transported into the tank 101, while the grease at the top is intercepted and collected and transported uniformly. At the same time, the adjustment component 303 can adjust the separation effect of grease and wastewater according to the amount of oily wastewater entering the tank 101, thereby completing the oil-liquid separation. The separated wastewater is discharged from the outlet 104, and the separated grease is discharged from the inside of the separation component 302, thus completing the oil-liquid separation. Moreover, the impurities and particles collected inside the filter component 201 can be uniformly cleaned by opening the inspection port 102.

[0043] Example 2, refer to Figures 1-7 This is the second embodiment of the present invention, which differs from the first embodiment in that: the filter assembly 201 includes an interceptor plate 2011 inside the tank 101, a conveying pipe 2012 disposed inside the interceptor plate 2011, an interceptor cylinder 2015 rotatably disposed on one side of the outer diameter of the conveying pipe 2012, and a baffle 2016 disposed on the interceptor cylinder 2015, wherein the baffle 2016 cooperates with the spray assembly 202, an annular filter plate 2013 is disposed inside one side of the conveying pipe 2012, and a collector 2014 is disposed on the outer diameter of the conveying pipe 2012, wherein the collector 2014 and the annular filter plate 2013 are disposed inside the spray assembly 202. The filter plate 2013 is connected through and connected. When treating oily wastewater, the inlet 103 is connected to the wastewater discharge outlet, so that the oily wastewater enters the interior of the interception cylinder 2015 through the inlet 103. The impact force generated when the oily wastewater enters the interception cylinder 2015 causes the interception cylinder 2015 to start rotating along the outer diameter of the conveying pipe 2012, and begins to filter and separate the particulate matter inside the oily wastewater. At the same time, the wastewater and grease are discharged together, while all the particulate matter and impurities intercepted by the interception cylinder 2015 are intercepted inside the interception cylinder 2015.

[0044] Compared to Embodiment 1, the spray assembly 202 further includes a water pump 2021 disposed on the top of the tank 101, a water supply pipe 2022 disposed at the output end of the water pump 2021, and a spray element 2023 disposed at the other end of the water supply pipe 2022. The spray element 2023 cooperates with the baffle 2016 and the intercepting cylinder 2015. The input end of the water pump 2021 is provided with a conduit 2024, and the other end of the conduit 2024 is provided with an F-shaped pipe 2025. The F-type pipe 2025 penetrates and connects to the tank 101. While the interceptor cylinder 2015 filters and separates particulate matter inside the oily wastewater, the water pump 2021 at the top of the tank 101 also starts working. It begins to draw wastewater from inside the tank 101 through the conduit 2024 and the F-type pipe 2025, and then transports the wastewater through the water pipe 2022 to the spray unit 2023. The spray unit 2023 then begins to spray the interceptor cylinder 2015. The outer diameter is rinsed. During the rinsing process of the spray component 2023, the baffle 2016 is impacted, accelerating the rotation of the interception cylinder 2015 itself, which allows for better interception of particulate matter in oily wastewater. The spray component 2023 can also spray and rinse the filter port of the interception cylinder 2015, causing all the particulate matter on the inner wall of the interception cylinder 2015 to impact the inside of the collection component 2014, where it is collected uniformly. The water that is impacted is then filtered by the annular filter plate 2013 and returned to the conveying pipe 2012. It is then transported by the conveying pipe 2012 to the inside of the tank 101, where it is transported together with the filtered interception cylinder 2015 to begin oil-liquid separation. This process also achieves water circulation for rinsing, reducing resource waste. At the same time, the particulate matter and impurities inside the collection component 2014 can be cleaned and collected through the inspection port 102.

[0045] During use, when treating oily wastewater, the inlet 103 is connected to the wastewater discharge outlet, allowing the oily wastewater to enter the interceptor cylinder 2015 through the inlet 103. The impact force generated when the oily wastewater enters the interceptor cylinder 2015 causes the interceptor cylinder 2015 to start rotating along the outer diameter of the conveying pipe 2012, thus filtering and separating the particulate matter inside the oily wastewater. At the same time, the wastewater and grease are discharged together, and the oil is transported together to the tank 101 through the interceptor plate 2011 for separation. All the particulate matter and impurities intercepted by the interceptor cylinder 2015 are trapped inside the interceptor cylinder 2015.

[0046] While the interceptor cylinder 2015 filters and separates particulate matter inside the oily wastewater, the water pump 2021 at the top of the tank 101 also starts working. It begins to draw wastewater from inside the tank 101 through the conduit 2024 and F-type pipe 2025, and then transports the wastewater to the spray unit 2023 through the water supply pipe 2022. The spray unit 2023 then begins to rinse the outer diameter of the interceptor cylinder 2015. During the rinsing process of the spray unit 2023, the baffle 2016 is impacted, accelerating the rotation of the interceptor cylinder 2015 itself, thus enabling better interception of particulate matter in the oily wastewater. The spray unit 2023 also effectively cleans the interceptor cylinder. The filter port of the intercepting cylinder 2015 is sprayed and rinsed, so that all the particles inside the intercepting cylinder 2015 are impacted into the collection component 2014 and collected uniformly. Then, the water that is impacted is filtered by the annular filter plate 2013 and returned to the conveying pipe 2012. It is then transported into the tank 101 by the conveying pipe 2012, and together with the filtered intercepting cylinder 2015, it is transported into the tank 101 to start oil-liquid separation and realize the water circulation of rinsing, reducing resource waste. At the same time, the particulate matter and impurities inside the collection component 2014 can also be cleaned and collected through the inspection port 102.

[0047] The remaining structure is the same as that in Example 1.

[0048] Example 3, referring to Figures 1-10This is the third embodiment of the present invention, which differs from the second embodiment in that: the air injection assembly 301 includes a suction fan 3011 disposed at the top of the tank 101, L-shaped pipes 3012 disposed at both ends of the suction fan 3011, and a blower 3013 disposed at the bottom of the L-shaped pipes 3012, wherein the L-shaped pipes 3012 penetrate and are connected to the tank 101; the separation assembly 302 includes a first partition plate 3021 disposed inside the tank 101, a second partition plate 3022 disposed inside the tank 101, and a partition plate 3023 disposed on the tank 101. The tank 101 contains an internal interceptor plate 3025, which works in conjunction with a dividing plate 3022. A U-shaped baffle 3023 is installed on one side of the dividing plate 3022, and an oil drain pipe 3024 is installed on the U-shaped baffle 3023, passing through and fixedly connected to the tank body 101. After the oily wastewater is filtered and separated by the filter assembly 201 and the spray assembly 202, the oily wastewater enters the interior of the tank 101. Since the density of oil is less than that of water, the oil in the wastewater itself... The grease begins to move upwards and undergoes natural separation. The suction fan 3011 starts working, drawing in air from the outside and delivering it through the L-shaped pipe 3012 to the inside of the blower 3013. The blower 3013 then generates a large number of bubbles at the bottom of the oily wastewater. These bubbles move upwards from the bottom of the wastewater, contacting and adsorbing the grease, then carrying it to the top of the wastewater to accelerate oil separation, thus ensuring all the grease floats to the surface. The grease floats on top of the sewage, while the grease on top is intercepted by the U-shaped baffle 3023. The sewage at the bottom is transported into the tank 101 through the dividing plate 3021, so that the grease on top of the sewage is intercepted by the U-shaped baffle 3023 and collected into the U-shaped baffle 3023 by the adjusting component 303. The grease is collected and transported out through the oil drain pipe 3024, while the sewage separated at the bottom is transported out through the discharge port 104 through the dividing plate 3021 and the intercepting plate 3025, thus achieving oil-liquid separation and separate transportation.

[0049] Compared to Embodiment 2, the adjustment component 303 further includes an electric push rod 3031 disposed on the top of the tank 101, a U-shaped connecting rod 3032 disposed on the output end of the electric push rod 3031, and a movable plate 3033 disposed on the bottom of the U-shaped connecting rod 3032. The movable plate 3033 is slidably connected inside the U-shaped baffle 3023, and the U-shaped connecting rod 3032 is slidably connected to the L-shaped tube 3012. The top of the movable plate 3033 is provided with a baffle tooth 3034. When the grease in the oily wastewater passes through the movable plate 3033, it is separated and transported to the inside of the U-shaped baffle 3023 by the baffle tooth 3034 on the top of the movable plate 3033. At the same time, the electric push rod 3031 can adjust the sliding of the movable plate 3033 inside the U-shaped baffle 3023 by driving the U-shaped connecting rod 3032, so as to ensure that the top of the movable plate 3033 is higher than the wastewater and lower than the grease, thereby achieving the separation of wastewater and grease.

[0050] During use, after the oily wastewater is filtered and separated by the combination of the filter assembly 201 and the spray assembly 202, the oily wastewater enters the tank 101. Since the density of oil is less than that of water, the oil in the wastewater begins to rise and undergo natural separation. The suction fan 3011 starts working, drawing in air from the outside and delivering it through the L-shaped pipe 3012 to the blower 3013. The blower 3013 then generates a large number of bubbles at the bottom of the oily wastewater. These bubbles rise from the bottom of the wastewater and, during their movement, interact with the oil in the wastewater. The oil comes into contact with the wastewater, adsorbs the grease, and then carries it to the top of the wastewater to accelerate the oil-liquid separation. As a result, all the grease floats on top of the wastewater, while the grease at the top is intercepted by the U-shaped baffle 3023. The wastewater at the bottom is then transported into the tank 101 through the dividing plate 3021. The grease at the top of the wastewater is intercepted by the U-shaped baffle 3023 and collected inside the U-shaped baffle 3023 by the adjusting component 303. The grease is then collected and transported out through the oil drain pipe 3024. The wastewater separated at the bottom is transported out through the discharge port 104 through the dividing plate 3021 and the intercepting plate 3025, thus achieving oil-liquid separation and separate transport.

[0051] When grease in oily wastewater passes through the moving plate 3033, it is separated and transported to the interior of the U-shaped baffle 3023 by the baffle teeth 3034 at the top of the moving plate 3033. At the same time, the electric push rod 3031 can adjust the sliding of the moving plate 3033 inside the U-shaped baffle 3023 by driving the U-shaped connecting rod 3032, so that the top of the moving plate 3033 is higher than the wastewater and lower than the grease, thus achieving separation of wastewater and grease, ensuring efficient separation, improving separation efficiency, reducing impurity residue, improving operational flexibility and adaptability, effectively treating oily wastewater, achieving rapid and efficient separation, and reducing resource waste and environmental pollution.

[0052] The remaining structure is the same as that in Example 2.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pretreatment device for oilfield produced oily wastewater: comprising a tank unit (100) and a filter unit (200) for filtering solid particles, characterized in that: The filter unit (200) includes a filter assembly (201) disposed inside the tank (101) for intercepting solids inside the wastewater, and a spray assembly (202) disposed on top of the filter assembly (201) for spraying and rinsing the filter assembly (201). The filter assembly (201) includes an interceptor plate (2011) inside the tank (101), a conveying pipe (2012) disposed inside the interceptor plate (2011), and an interceptor cylinder (2015) rotatably disposed on one side of the outer diameter of the conveying pipe (2012). A baffle (2016) is disposed on the interceptor cylinder (2015), and the baffle (2016) cooperates with the spray assembly (202). An annular filter plate (2013) is provided inside one side of the conveying pipe (2012), and a collection component (2014) is provided on the outer diameter of the conveying pipe (2012), and the collection component (2014) and the annular filter plate (2013) pass through and are connected. The spray assembly (202) includes a water pump (2021) disposed on the top of the tank (101), a water supply pipe (2022) disposed at the output end of the water pump (2021), and a spray element (2023) disposed at the other end of the water supply pipe (2022), and the spray element (2023) cooperates with the baffle (2016) and the intercepting cylinder (2015); The water pump (2021) has a conduit (2024) at its input end and an F-type pipe (2025) at the other end of the conduit (2024), which passes through and connects to the tank (101). The oil-liquid separation unit (300) includes a gas injection assembly (301) disposed on the top of the tank (101) for accelerating oil-liquid separation, a separation assembly (302) disposed inside the gas injection assembly (301) for separating oil, and an adjustment assembly (303) slidably disposed on the separation assembly (302) for adjusting oil-liquid separation. The adjustment assembly (303) rises as the amount of oil inside the tank unit (100) increases to ensure the best oil-liquid separation effect. The air injection assembly (301) includes a suction fan (3011) disposed on the top of the tank (101), L-shaped pipes (3012) disposed at both ends of the suction fan (3011), and a blower (3013) disposed at the bottom of the L-shaped pipes (3012), wherein the L-shaped pipes (3012) penetrate and are connected to the tank (101); The separation assembly (302) includes a first partition plate (3021) disposed inside the tank (101), a second partition plate (3022) disposed inside the tank (101), and a second interceptor plate (3025) disposed inside the tank (101), wherein the second interceptor plate (3025) cooperates with the second partition plate (3022); A U-shaped guardrail (3023) is provided on one side of the partition plate 2 (3022), and an oil drain pipe (3024) is provided on the U-shaped guardrail (3023), and the oil drain pipe (3024) passes through and is fixedly connected to the tank body (101); The adjustment assembly (303) includes an electric push rod (3031) disposed on the top of the tank body (101), a U-shaped connecting rod (3032) disposed on the output end of the electric push rod (3031), and a movable plate (3033) disposed on the bottom of the U-shaped connecting rod (3032). The movable plate (3033) is slidably connected inside the U-shaped guardrail (3023), and the U-shaped connecting rod (3032) is slidably connected to the L-shaped tube (3012). The top of the movable plate (3033) is provided with a stop tooth (3034).

2. The oilfield produced oily wastewater pretreatment apparatus according to claim 1, characterized in that: It includes a tank (101), an inlet (103) on one side of the tank (101) for connecting to sewage, an outlet (104) on the other side of the tank (101) for draining water, and an inspection port (102) on the tank (101) for inspecting and cleaning the inside of the tank (101).

Images