Sewage treatment equipment for water injection well in oilfield development

Abstract

The utility model discloses oilfield development water injection well sewage treatment equipment which comprises a box body with an opening at the bottom, a bottom plate with a conical bulge structure at the top is fixedly mounted at the bottom of the box body, a water outlet pipe is fixedly communicated with the bottom of the left side of the box body, and a water inlet pipe for introducing oilfield oil extraction sewage is arranged above the box body; the top of the bottom plate and the top of the box body are hermetically and rotatably embedded with a rotary drum with the same bottom end of a plugging structure, the top of the box body is fixedly connected with a blocking and protecting box with an opening in the bottom, and a water inlet pipe is fixedly embedded in the top of the blocking and protecting box and is communicated with the interior of the rotary drum. By arranging a series of structures, centrifugal rotating and quick filtering treatment on oil extraction sewage of an oil field is facilitated, personnel can be assisted to automatically clean and dredge a stainless steel filter screen and an activated carbon filter plate and discharge solid slag impurities after use, the personnel do not need to disassemble and assemble and move out solid slag, and cleaning, dredging and slag discharging work can be conveniently, quickly and conveniently carried out; and the cleaning convenience and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment device for oilfield development injection wells. Background Technology

[0002] my country has a large land area and a wide distribution of oil fields. Oilfield wastewater is a major source of pollution. This wastewater needs to be filtered to remove the large amount of solid residue it contains before most of it can be reinjected into the formation as production water for rational water recycling. Currently, the common method for filtration is to use a filter box in conjunction with a filter screen to remove solid residue, in order to prevent the water well from being blocked again due to the presence of a lot of solid residue when used as reinjection water.

[0003] In response, CN222331585U discloses a wastewater treatment device for oilfield injection wells, which uses activated carbon plates, filter screens, pressure strips, sponges, permeable baffles, sliding columns, a first spring, and a first connecting frame to filter solid slag impurities in produced oilfield wastewater for reuse. However, it has the following shortcomings in use:

[0004] As filtration occurs, the filter components, consisting of activated carbon plates and filter screens, inevitably become clogged with solid slag and impurities. This requires separate disassembly and handling by personnel, making it difficult to clean, dredge, and remove slag quickly and easily. Consequently, the convenience and efficiency of cleaning are not ideal. In view of this, this application proposes a wastewater treatment device for oilfield injection wells to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this utility model is to provide a wastewater treatment device for oilfield development injection wells to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a wastewater treatment device for oilfield development injection wells, including a box with an open bottom, a bottom plate with a conical protrusion structure fixedly installed at the bottom of the box, a water outlet pipe fixedly connected to the bottom left side of the box, and a water inlet pipe for supplying oilfield production wastewater at the top of the box.

[0007] The top of the base plate and the top of the box are rotatably fitted with the same rotating cylinder with a sealing structure at the bottom. The top of the box is fixedly connected to a baffle box with an open bottom. The water inlet pipe is embedded and fixed on the top of the baffle box and communicates with the inside of the rotating cylinder. A rotary drive assembly located inside the baffle box is fixedly sleeved on the rotating cylinder. The rotary drive assembly is used to drive the rotating cylinder to rotate.

[0008] Two filter water outlet components are fixedly connected to each of the four sides of the rotating drum. The filter water outlet components are used to quickly centrifuge and rotate the oilfield production wastewater that enters the rotating drum through the water inlet pipe when the rotating drum is rotating, and to filter and intercept solid slag particles and impurities. The filtered water is discharged through the water outlet pipe. The water outlet pipe is set to be connected to the external oilfield water injection equipment so that the filtered water can be reinjected and reused.

[0009] The baffle box is equipped with a backflushing and cleaning auxiliary assembly for backflushing and cleaning the filter water output component and for blowing downwards inside the rotating drum; the backflushing and cleaning auxiliary assembly is used to backflush and clean the filter water output component after use and to assist in blowing downwards the solid residue blown into the rotating drum.

[0010] The bottom inner wall of the rotating drum is configured as a conical structure and is connected to and fixed with a sewage discharge component; the sewage discharge component is used to discharge the solid slag blown downward after it is opened.

[0011] Preferably, the rotary drive assembly includes an external gear ring fixedly sleeved on the outside of the rotating drum, a gear located inside the guard box meshing on the left side of the external gear ring, and a drive motor whose output shaft is fixedly connected to the top of the gear is fixedly installed on the top left side of the guard box.

[0012] Preferably, the water filtration assembly includes horizontal pipes, and the four sides of the rotating cylinder are respectively connected and fixed to one end of two corresponding horizontal pipes. A stainless steel filter screen and an activated carbon filter plate are fixedly sleeved inside the horizontal pipes, and the side of the stainless steel filter screen away from the rotating cylinder is in movable contact with the corresponding activated carbon filter plate.

[0013] Preferably, the dredging and downblowing auxiliary assembly includes a fixed box fixedly connected to the top of the baffle box and fixedly sleeved on the outside of the water inlet pipe. The bottom left side of the fixed box is connected and fixedly connected with multiple downblowing pipes located inside the rotating drum in a ring shape with equal spacing. The water inlet pipe is located between the multiple downblowing pipes. The bottom right side of the fixed box is connected and fixedly connected with a vertical pipe located on the right side of the rotating drum with a bottom sealing structure. The left side of the vertical pipe is connected and fixedly connected with multiple cleaning pipes. The cleaning pipes are located on the right side of the stainless steel filter screen and cooperate with it. A high-pressure air pump is fixedly installed on the top right side of the baffle box. A one-way valve with the left side as the outlet is fixedly connected and fixedly connected between the air outlet of the high-pressure air pump and the top of the fixed box.

[0014] Preferably, the sewage discharge assembly includes a circular branch pipe embedded and fixed at the bottom of the rotating drum and connected to its interior. An L-shaped support is fixedly connected to the bottom left side of the base plate, and an electric sewage discharge valve is fixedly installed on the right side of the L-shaped support. The circular branch pipe is sealed and rotatably sleeved on the outside of the inlet end of the electric sewage discharge valve.

[0015] Preferably, a first sealing bearing is fixedly installed on the top inner wall of the protective box, and a circular through hole is opened on the top of the box body and the top of the bottom plate. A second sealing bearing is fixedly sleeved in the circular through hole. There are two second sealing bearings in the lower circular through hole. The inner rings of the first sealing bearing and the inner rings of the second sealing bearing are fixedly sleeved with the outer side of the rotating drum.

[0016] Preferably, each of the four bottom corners of the base plate is fixedly connected with a support leg.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. Through the combination of the set box, water outlet pipe, water inlet pipe, rotating drum, vortex drive assembly and filter water outlet assembly, it can perform centrifugal rotary rapid filtration treatment of oilfield production wastewater, and the activated carbon filter plate can also perform auxiliary purification work by absorbing harmful substances in the centrifuged rapid filtration water.

[0019] 2. Through the coordinated use of the rotating drum, vortex drive assembly, water filtration assembly, dredging and downblowing auxiliary discharge assembly, and sewage discharge assembly, the system can automatically assist personnel in cleaning and unblocking the stainless steel filter screen and activated carbon filter plate and discharging solid slag and impurities after use. There is no need for personnel to disassemble, handle, or remove solid slag, making cleaning, unblocking, and slag discharge work convenient, quick, and efficient, thus improving cleaning convenience and efficiency.

[0020] This utility model, through a series of structures, facilitates the centrifugal rotary rapid filtration treatment of oilfield wastewater. After use, it allows for automatic cleaning and unblocking of the stainless steel filter screen and activated carbon filter plate, as well as the removal of solid slag and impurities, without the need for personnel to disassemble, process, or remove solid slag. This makes cleaning, unblocking, and slag removal convenient, quick, and efficient, improving cleaning convenience and efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a wastewater treatment device for oilfield development injection wells proposed in this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure viewed from below;

[0023] Figure 3 This is a schematic diagram of the main sectional view of a wastewater treatment device for oilfield development injection wells proposed in this utility model.

[0024] In the diagram: 1. Housing; 101. Outlet pipe; 102. Inlet pipe; 2. Base plate; 201. Rotary drum; 202. Circular branch pipe; 203. Electric drain valve; 3. Protective box; 4. External gear ring; 401. Gear; 402. Drive motor; 5. Horizontal pipe; 501. Stainless steel filter screen; 6. Fixing box; 601. Down blow pipe; 602. Vertical pipe; 603. Cleaning pipe; 604. Check valve; 605. High-pressure air pump. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 3 As shown in the figure, the wastewater treatment equipment for oilfield development injection wells proposed in this embodiment includes a box 1 with an open bottom. A bottom plate 2 with a conical protrusion structure is fixedly installed at the bottom of the box 1. Support legs are fixedly connected to the four corners of the bottom of the bottom plate 2. A water outlet pipe 101 is fixedly connected to the bottom left side of the box 1. A water inlet pipe 102 for supplying oilfield production wastewater is provided on the top of the box 1.

[0027] The top of the base plate 2 and the top of the housing 1 are fitted with a rotating cylinder 201 with a sealed bottom end. The top of the housing 1 is fixedly connected to a baffle box 3 with an open bottom. A first sealing bearing is fixedly installed on the inner wall of the top of the baffle box 3. Both the top of the housing 1 and the top of the base plate 2 have circular through holes. A second sealing bearing is fixedly fitted in the circular through hole. There are two second sealing bearings in the lower circular through hole. The inner rings of the first and second sealing bearings are fixedly fitted to the outer side of the rotating cylinder 201, which achieves the effect of sealing and rotating the rotating cylinder 201. The water inlet pipe 102 is embedded and fixedly installed on the top of the baffle box 3 and communicates with the inside of the rotating cylinder 201. The top of the baffle box 3 has an inlay hole for fixed connection to the outer side of the water inlet pipe 102. A rotary drive assembly located in the baffle box 3 is fixedly fitted on the rotating cylinder 201. The rotary drive assembly is used to drive the rotating cylinder 201 to rotate.

[0028] Two filter water outlet components are fixedly connected to all four sides of the rotating drum 201. The filter water outlet components are used to quickly centrifuge and rotate the oilfield production wastewater entering the rotating drum 201 through the water inlet pipe 102 for rapid filtration when the rotating drum 201 rotates. The solid slag particles and impurities are filtered and intercepted. The filtered water is discharged through the water outlet pipe 101. The water outlet pipe 101 is set to be connected to the external oilfield water injection equipment for the water discharged after filtration treatment to be reinjected and reused.

[0029] The baffle box 3 is equipped with a backflushing and cleaning auxiliary component for backflushing and cleaning the filter water output component and for blowing downward into the inside of the rotating drum 201; the backflushing and cleaning auxiliary component is used to backflush and clean the filter water output component after use and to assist in blowing downward into the solid residue blown into the inside of the rotating drum 201.

[0030] The bottom inner wall of the rotating drum 201 is set as a conical structure and is connected and fixed with a sewage discharge component; the sewage discharge component is used to discharge the solid slag blown downward after it is opened.

[0031] Specifically, the rotary drive assembly includes an external gear ring 4 fixedly sleeved on the outside of the rotating drum 201. A gear 401 located inside the guard box 3 meshes with the left side of the external gear ring 4. A drive motor 402 with an output shaft fixedly connected to the top of the gear 401 is fixedly installed on the top left side of the guard box 3. The external gear ring 4, gear 401 and drive motor 402 cooperate to drive the gear 401 to rotate. Under the meshing action, the gear 401 drives the external gear ring 4 to rotate, and the rotation of the external gear ring 4 drives the rotating drum 201 to rotate.

[0032] Furthermore, the filtration assembly includes horizontal pipes 5, and the four sides of the rotating drum 201 are respectively connected and fixed to one end of two corresponding horizontal pipes 5. A stainless steel filter screen 501 and an activated carbon filter plate are fixedly sleeved inside the horizontal pipe 5. The side of the stainless steel filter screen 501 away from the rotating drum 201 is in contact with the corresponding activated carbon filter plate. The horizontal pipes 5, stainless steel filter screen 501 and activated carbon filter plate work together to drive the horizontal pipes 5, stainless steel filter screen 501 and activated carbon filter plate to rotate as a whole when the rotating drum 201 rotates. Under the action of rotation, the oilfield produced wastewater is thrown out into multiple horizontal pipes 5, and then filtered by the stainless steel filter screen 501 and activated carbon filter plate in sequence before being quickly thrown out into the housing 1. Solid slag and impurities are filtered and blocked in the horizontal pipes 5, realizing the effect of rapid centrifugal rotation filtration of oilfield produced wastewater.

[0033] Furthermore, the down-blowing auxiliary drainage assembly includes a fixed box 6 fixedly connected to the top of the baffle box 3 and fixedly sleeved on the outside of the water inlet pipe 102. The fixed box 6 has fitting holes at its top and bottom for fixed connection to the outside of the water inlet pipe 102. Multiple down-blowing pipes 601 located inside the rotating drum 201 are fixedly connected in a ring-shaped arrangement on the bottom left side of the fixed box 6. Multiple through holes are fixedly connected to the outside of the corresponding down-blowing pipes 601 at the top of the housing 1. The water inlet pipe 102 is located between the multiple down-blowing pipes 601. A vertical pipe 602 with a sealed bottom end is fixedly connected to the right side of the rotating drum 201 on the bottom right side of the fixed box 6. Multiple cleaning pipes 603 are fixedly connected to the left side of the vertical pipe 602. The cleaning pipes 603 are located to the right of the stainless steel filter screen 501 and cooperate with it. A cleaning pipe is fixedly installed on the top right side of the baffle box 3. A high-pressure air pump 605 is connected to the top of the fixed box 6 by a one-way valve 604 with the left side as the outlet. The fixed box 6, the downblown pipe 601, the vertical pipe 602, the cleaning pipe 603, the high-pressure air pump 605 and the one-way valve 604 work together to clean and dredge the stainless steel filter screen 501 and the activated carbon filter plate after use. The high-pressure air pump 605 is started to supply air into the fixed box 6 through the one-way valve 604. A part of the gas enters the vertical pipe 602 and then blows to the left through multiple cleaning pipes 603 to backblow and clean the rotating stainless steel filter screen 501 and the activated carbon filter plate. This causes the solid slag and impurities to be blown into the rotating drum 201. Another part of the gas that enters the fixed box 6 blows downward into the rotating drum 201 through multiple downblown pipes 601 to assist in the downward blowing and discharge of the solid slag and impurities that have been blown into it.

[0034] Furthermore, the sewage discharge assembly includes a circular branch pipe 202 embedded and fixed to the bottom of the rotating drum 201 and connected to its interior. An L-shaped support is fixedly connected to the bottom left side of the base plate 2, and an electric sewage discharge valve 203 is fixedly installed on the right side of the L-shaped support. The circular branch pipe 202 is rotatably and sealingly fitted onto the outside of the inlet end of the electric sewage discharge valve 203. Two third sealing bearings are fixedly fitted inside the circular branch pipe 202. The inner rings of the third sealing bearings are fixedly fitted onto the outside of the inlet end of the electric sewage discharge valve 203, serving to support the circular branch pipe 202. The sealing and rotating installation of branch pipe 202 avoids the rotational torque on electric drain valve 203 when the circular branch pipe 202 rotates with the rotating drum 201. The circular branch pipe 202, L-shaped support and electric drain valve 203 work together. When cleaning and discharging slag, the personnel open the electric drain valve 203. At this time, the solid slag and impurities that are blown downward are discharged downward through the electric drain valve 203. Only a slag collection box for collecting slag needs to be placed below the electric drain valve 203.

[0035] The drive motor 402 can be a variable frequency motor, which can be used with a corresponding external variable frequency controller for operation by personnel. This allows personnel to adjust the rotation speed of the drum 201 during subsequent cleaning and dredging operations, so that the backflushing cleaning and dredging work can be carried out better. The connection and application technology between the variable frequency motor and the variable frequency controller is a mature existing technology, which will not be described in detail here.

[0036] The usage method of this embodiment is as follows: When using the wastewater treatment equipment for the oilfield development injection wells, the inlet pipe 102 is connected to the external oilfield wastewater supply pipeline to allow the oilfield wastewater to be fed into the rotating drum 201. The drive motor 402 is started to drive the gear 401 to rotate. Under meshing action, the gear 401 drives the outer gear ring 4 to rotate, and the outer gear ring 4 drives the rotating drum 201 to rotate. When the rotating drum 201 rotates, it drives the horizontal pipe 5, the stainless steel filter screen 501, and the activated carbon filter plate to rotate as a whole. Under the action of rotation... Oilfield wastewater is thrown into multiple horizontal pipes 5, and then filtered by stainless steel filter screens 501 and activated carbon filter plates in sequence before being rapidly thrown into the housing 1. Solid slag and impurities are filtered and blocked in the horizontal pipes 5. The activated carbon filter plates also absorb harmful substances to assist in purification, achieving the effect of centrifugal rotary rapid filtration of oilfield wastewater. The water outlet pipe 101 is used to connect to external oilfield water injection equipment for the water discharged after filtration to be reinjected and reused. It can also be connected to an external water storage tank in advance for temporary storage and later use.

[0037] After use, when cleaning and unblocking the stainless steel filter screen 501 and activated carbon filter plate and removing slag, personnel should open the electric drain valve 203 and the high-pressure air pump 605. The high-pressure air pump 605 supplies air to the fixed box 6 through the one-way valve 604. Part of the air enters the vertical pipe 602 and then blows to the left through multiple blowing pipes 603 to back-blown clean and unblock the rotating stainless steel filter screen 501 and activated carbon filter plate, causing solid slag and impurities to be blown into the rotating drum 201. The other part of the air entering the fixed box 6 blows downward into the rotating drum 201 through multiple downward blowing pipes 601, clearing the solid slag that has been blown into its interior. The impurities are assisted by downward blowing. At this time, the solid slag impurities blown downward are discharged through the electric drain valve 203. Only a slag collection box for collecting slag needs to be placed below the electric drain valve 203. After use, it can automatically assist personnel in cleaning and unblocking the stainless steel filter screen 501 and activated carbon filter plate and discharging solid slag impurities. There is no need for personnel to disassemble, handle, or remove solid slag. It is convenient, quick, and easy to clean and unblock the slag discharge work, improving the convenience and efficiency of cleaning. After cleaning, the high-pressure air pump 605 and the electric drain valve 203 can be turned off to resume the supply of sewage and centrifugal rapid filtration treatment.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oilfield development water injection well sewage treatment equipment comprising a box (1) with an open bottom, characterized in that: The bottom of the box (1) is fixedly provided with a bottom plate (2) with a conical protruding structure at the top, the left bottom of the box (1) is fixedly provided with a water outlet pipe (101), and the upper portion of the box (1) is provided with a water inlet pipe (102) for the oilfield produced water. The top of the bottom plate (2) and the top of the box (1) are sealingly and rotatably embedded with the same rotary drum (201) with a blocking structure at the bottom end, the top of the box (1) is fixedly connected with a guard box (3) with an opening at the bottom, the water inlet pipe (102) is embedded and fixed at the top of the guard box (3) and communicates with the inside of the rotary drum (201), and a rotary drive assembly is fixedly sleeved on the rotary drum (201) in the guard box (3). The rotary drum (201) is fixedly provided with two filter water outlet assemblies on four sides. The guard box (3) is provided with a blow cleaning and dredging auxiliary exhaust assembly for the filter water outlet assembly and the inside of the rotary drum (201). The bottom inner wall of the rotary drum (201) is provided in a conical structure and is fixedly provided with a blow cleaning and dredging auxiliary exhaust assembly.

2. The oilfield development water injection well sewage treatment equipment according to claim 1, characterized in that: The rotary drive assembly comprises an outer gear ring (4) fixedly sleeved on the outside of the rotary drum (201), the left side of the outer gear ring (4) is engaged with a gear (401) in the guard box (3), and the top left side of the guard box (3) is fixedly provided with a driving motor (402) with an output shaft fixedly connected with the top of the gear (401).

3. The oilfield development water injection well sewage treatment equipment according to claim 1, characterized in that: The filter water outlet assembly comprises a cross pipe (5), the four sides of the rotary drum (201) are fixedly provided with one end of the corresponding two cross pipes (5), the cross pipe (5) is fixedly sleeved with a stainless steel filter screen (501) and an activated carbon filter plate, and the side, away from the rotary drum (201), of the stainless steel filter screen (501) is movably and abuttingly contacted with the corresponding activated carbon filter plate.

4. The oilfield development water injection well sewage treatment equipment according to claim 1, characterized in that: The blow cleaning and dredging auxiliary exhaust assembly comprises a fixed box (6) fixedly connected at the top of the guard box (3) and fixedly sleeved on the outside of the water inlet pipe (102), a plurality of blow-down pipes (601) in the rotary drum (201) are fixedly and annularly arranged at the bottom left side of the fixed box (6) at equal intervals, the water inlet pipe (102) is located between the plurality of blow-down pipes (601), a vertical pipe (602) with a blocking structure at the bottom end is fixedly connected at the bottom right side of the fixed box (6) and located at the right side of the rotary drum (201), a plurality of blow cleaning pipes (603) are fixedly connected at the left side of the vertical pipe (602), the blow cleaning pipes (603) are located at the right side of the stainless steel filter screen (501) and matched with the same, a high-pressure gas pump (605) is fixedly installed at the top right side of the guard box (3), and a one-way valve (604) with an outlet at the left side is fixedly and communicatively connected between the gas outlet of the high-pressure gas pump (605) and the top of the fixed box (6).

5. The oilfield development water injection well wastewater treatment apparatus of claim 1, wherein: The blow cleaning and dredging auxiliary exhaust assembly comprises a fixed box (6) fixedly connected at the top of the guard box (3) and fixedly sleeved on the outside of the water inlet pipe (102), a plurality of blow-down pipes (601) in the rotary drum (201) are fixedly and annularly arranged at the bottom left side of the fixed box (6) at equal intervals, the water inlet pipe (102) is located between the plurality of blow-down pipes (601), a vertical pipe (602) with a blocking structure at the bottom end is fixedly connected at the bottom right side of the fixed box (6) and located at the right side of the rotary drum (201), a plurality of blow cleaning pipes (603) are fixedly connected at the left side of the vertical pipe (602), the blow cleaning pipes (603) are located at the right side of the stainless steel filter screen (501) and matched with the same, a high-pressure gas pump (605) is fixedly installed at the top right side of the guard box (3), and a one-way valve (604) with an outlet at the left side is fixedly and communicatively connected between the gas outlet of the high-pressure gas pump (605) and the top of the fixed box (6). The blow cleaning and dredging auxiliary exhaust assembly comprises a fixed box (6) fixedly connected at the top of the guard box (3) and fixedly sleeved on the outside of the water inlet pipe (102), a plurality of blow-down pipes (601) in the rotary drum (201) are fixedly and annularly arranged at the bottom left side of the fixed box (6) at equal intervals, the water inlet pipe (102) is located between the plurality of blow-down pipes (601), a vertical pipe (602) with a blocking structure at the bottom end is fixedly connected at the bottom right side of the fixed box (6) and located at the right side of the rotary drum (201), a plurality of blow cleaning pipes (603) are fixedly connected at the left side of the vertical pipe (602), the blow cleaning pipes (603) are located at the right side of the stainless steel filter screen (501) and matched with the same, a high-pressure gas pump (605) is fixedly installed at the top right side of the guard box (3), and a one-way valve (604) with an outlet at the left side is fixedly and communicatively connected between the gas outlet of the high-pressure gas pump (605) and the top of the fixed box (6).

6. The oilfield development water injection well wastewater treatment apparatus of claim 1, wherein: The first sealing bearing is fixedly installed on the inner wall of the top of the guard box (3), the top of the box body (1) and the top of the bottom plate (2) are both provided with a circular through hole, and the second sealing bearing is fixedly sleeved in the circular through hole.

7. The oilfield development water injection well wastewater treatment apparatus of claim 1, wherein: The bottom plate (2) is fixedly connected with four supporting legs.

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