CN219429860U

CN219429860U - Integrated sewage treatment device for oil field

Info

Publication number: CN219429860U
Application number: CN202320764060.5U
Authority: CN
Inventors: 林桦; 李从延; 张文静; 钟育其
Original assignee: Sichuan Jiayu Oilfield Engineering Technology Service Co ltd
Current assignee: Sichuan Jiayu Oilfield Engineering Technology Service Co ltd
Priority date: 2023-04-10
Filing date: 2023-04-10
Publication date: 2023-07-28
Anticipated expiration: 2033-04-10

Abstract

The utility model discloses an integrated sewage treatment device for an oil field, which comprises a filtering area, an air floatation area and a reactor, wherein the filtering area, the air floatation area and the reactor sequentially pass along the sewage flowing direction; the reactor is in a truncated cone shape with a big top and a big bottom, a horn-shaped cylinder with a big top is arranged in the center of the reactor, a mixing area is arranged on the inner side of the cylinder, a flocculation area is arranged on the outer side of the cylinder, a rotating shaft is vertically arranged in the mixing area, a plurality of stirring rods are uniformly arranged on the rotating shaft from top to bottom, and a drain pipe extending out of the reactor is arranged at the top of the flocculation area; the filtering area is communicated with the air floatation area through a pipeline provided with a first water pump, and the air floatation area is communicated with the flocculation area of the reactor through a pipeline provided with a second water pump. The active carbon adsorption is changed into an air flotation degreasing method and a flocculation degreasing method, the two methods have long service time, the condition of replacing the active carbon is omitted, and the cost of sewage treatment is reduced; by separating the flocculation zone from the mixing zone, the disturbance of the inlet water to the sediment can be reduced, and the overall sewage treatment efficiency is improved.

Description

Integrated sewage treatment device for oil field

Technical Field

The utility model relates to the technical field of oilfield sewage treatment devices, in particular to an integrated sewage treatment device for an oilfield.

Background

Most of oil field exploitation adopts a water injection mode, and the generated sewage has complex components and contains a large amount of solid sand impurities and petroleum organic pollutants which are flushed out during exploitation. In the application document of the 'oilfield sewage treatment device' with the publication number of CN218539485U, the purpose of treating the wastewater is achieved by adsorbing the flocculated and precipitated wastewater through an activated carbon plate. Because the oil content of the oil field wastewater is large, the adsorption holes of the activated carbon plates are easy to block, the adsorption efficiency of the activated carbon plates is reduced, the activated carbon plates in the device are required to be replaced periodically, the replacement time interval is too long, the wastewater treatment cost is increased by using the device, and the treated effluent quality is influenced and cannot meet the requirement, so that the integrated sewage treatment device for the oil field is provided.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide an integrated sewage treatment device for an oil field, which can ensure that sewage can reach the water quality standard of water injection for reuse through oil removal for many times.

The utility model adopts the following technical scheme to realize the aim:

the integrated sewage treatment device for the oil field comprises a filtering area, an air floatation area and a reactor which sequentially pass along the sewage flowing direction; the reactor is in a truncated cone shape with a big top and a big bottom, a horn-shaped cylinder with a big top is arranged in the center of the reactor, a mixing area is arranged on the inner side of the cylinder, a flocculation area is arranged on the outer side of the cylinder, a rotating shaft is vertically arranged in the mixing area, a plurality of stirring rods are uniformly arranged on the rotating shaft from top to bottom, and a drain pipe extending out of the reactor is arranged at the top of the flocculation area;

the filtering area is communicated with the air floatation area through a pipeline provided with a first water pump, and the air floatation area is communicated with the flocculation area of the reactor through a pipeline provided with a second water pump.

In the above technical scheme, preferably, the bottom of the reactor is provided with an annular sludge zone, the sludge zone surrounds the lower end of the cylinder, the sludge zone is connected with a sludge outlet pipe to remove internal sludge, the upper end of the cylinder is flush with the reactor, and the distance between the lower end of the cylinder and the bottom of the reactor is 70-120 cm.

In the above technical solution, preferably, the length of the stirring rod increases from top to bottom in sequence, and the lowest stirring rod extends out of the mixing zone.

In the above technical scheme, preferably, a first partition plate is vertically arranged in the filtering area, the lower part of the first partition plate is embedded into the second filter screen, and a first filter screen is obliquely arranged on the side wall of the filtering area in the water direction of the first partition plate.

In the above technical scheme, preferably, one end of the first filter screen is hinged on the side wall of the filter area, the other end of the first filter screen is abutted with the first partition board, and the inclination angle of the first filter screen is 35-55 degrees.

In the above technical scheme, preferably, the second baffle is vertically arranged in the air floatation zone, the distance between the bottom of the second baffle and the bottom of the air floatation zone is 60-100 cm, the overflow plate arranged at the bottom of the air floatation zone is vertically arranged on one side of the second baffle close to the reactor, the air dissolving water pipe externally connected with the air dissolving tank is arranged between the second baffle and the overflow plate, the L-shaped baffle is arranged on the upper part of the side wall of the air floatation zone close to one side of the reactor, an oil outlet groove is formed between the L-shaped baffle and the side wall, oil in the oil outlet groove is discharged through the oil outlet pipe on the side wall, and the L-shaped baffle is provided with a slag scraping plate on one side far away from the oil outlet pipe.

In the above technical solution, preferably, the mesh diameter of the first filter screen is larger than the mesh diameter of the second filter screen.

In the above technical solution, preferably, the top of the second partition is flush with the top of the sidewall of the air floating zone, and the top position of the overflow plate is lower than the top of the second partition.

In the above technical solution, preferably, the chemical agent is introduced from the top of the mixing zone.

In the above technical solution, preferably, the filtering area, the air-floating area and the reactor form an integral device.

Compared with the prior art, the integrated sewage treatment device for the oil field provided by the utility model comprises the following components

The beneficial effects are that:

the active carbon adsorption is changed into an air flotation degreasing method and a flocculation degreasing method, the two methods have long service time, the condition of replacing the active carbon is omitted, and the cost of sewage treatment is reduced; through separating flocculation zone and mixing zone, reduce the influence to the flocculation zone when mixing, this structure can reduce the disturbance of intaking to the sediment, has improved holistic sewage treatment efficiency.

Drawings

FIG. 1 is a schematic view of the overall structure of a sewage treatment apparatus of the present utility model;

FIG. 2 is a schematic view of the overall structure of the reactor of the present utility model;

in the figure: 1-filtering area, 101-first baffle, 102-second filter screen, 2-air floating area, 201-second baffle, 202-overflow plate, 3-reactor, 301-mud area, 302-flocculation area, 303-mixing area, 4-rotating shaft, 401-stirring rod, 5-drain pipe, 6-mud pipe, 7-second water pump, 8-oil pipe, 9-L-shaped baffle, 10-slag scraping plate, 11-dissolved air water pipe, 12-first water pump, 13-first filter screen and 14-cylinder.

Detailed Description

It should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying positive importance. Merely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

referring to fig. 1 and 2, the integrated sewage treatment device for an oilfield provided by the embodiment of the utility model includes a filtering area 1, an air-floating area 2 and a reactor 3 passing through in sequence along the sewage flowing direction, wherein the filtering area 1, the air-floating area 2 and the reactor 3 form an integral device, the filtering area 1 and the air-floating area 2 are communicated through a pipeline provided with a first water pump 12, and the air-floating area 2 and a flocculation area 302 of the reactor 3 are communicated through a pipeline provided with a second water pump 7.

In order to better implement the utility model, referring to fig. 1, in one embodiment, a first partition board 101 is vertically arranged in the filtering area 1, a second filter screen 102 is embedded in the lower portion of the first partition board 101, a first filter screen 13 is obliquely arranged on the side wall of the filtering area 1 in the water incoming direction of the first partition board 101, one end of the first filter screen 13 is hinged to the side wall of the filtering area 1, the other end of the first filter screen 13 is abutted to the first partition board 101, the inclination angle of the first filter screen 13 is 35-55 degrees, and the mesh diameter of the first filter screen 13 is larger than that of the second filter screen 102. Sewage enters the filtering area 1 from the upper part of the first filter screen 13, the first filter screen 13 filters the sewage for the first time, then the sewage is filtered for the second time through the second filter screen 102, part of generated filter residues are left on the first filter screen 13 and can be removed periodically, and the other part of generated filter residues are left in the filtering area 1 at the lower part of the first filter screen 13, and the first filter screen 13 is rotated and opened around a hinge part, so that the filter residues in the filtering area 1 can be conveniently removed. The sewage after the twice filtration is pumped into the air floating zone 2 by the first water pump 12.

In order to better implement the utility model, referring to fig. 1, in one embodiment, a second partition 201 is vertically arranged in the air flotation zone 2, sewage pumped into the air flotation zone 2 enters between the second partition 201 and the side wall of the air flotation zone 2, the distance between the bottom of the second partition 201 and the bottom of the air flotation zone 2 is 60-100 cm, an overflow plate 202 is vertically arranged at one side of the second partition 201, which is close to the reactor 3, which is arranged at the bottom of the air flotation zone 2, a dissolved air pipe 11 externally connected with a dissolved air tank is arranged between the second partition 201 and the overflow plate 202, gas separated out from the dissolved air pipe 11 is mixed with sewage for air flotation separation, part of oil is removed, the top of the second partition 201 is flush with the top of the side wall of the air flotation zone 2, the top of the overflow plate 202 is lower than the top of the second partition 201, an L-shaped partition 9 is arranged at the upper part of the side wall, which is close to one side of the reactor 3, an oil outlet groove is formed between the L-shaped partition 9 and the side wall, the oil in the oil outlet groove is discharged through an oil outlet pipe 8 on the side wall, and one side, which is far from the oil outlet pipe 8 is arranged.

In order to better implement the utility model, referring to fig. 1 and 2, in one embodiment, the reactor 3 is in a shape of a truncated cone with a big top and a big bottom, the center of the reactor 3 is provided with a horn-shaped cylinder 14 with a small top and a big bottom, the inner side of the cylinder 14 is provided with a mixing area 303, the outer side is provided with a flocculation area 302, chemical agents and incoming water are all put into the mixing area 303 from the top, a rotating shaft 4 is vertically arranged in the mixing area 303, a motor is externally connected to the top of the rotating shaft 4 to control the chemical agents and incoming water, a plurality of stirring rods 401 are uniformly arranged on the rotating shaft 4 from top to bottom, the lengths of the stirring rods 401 are sequentially increased from top to bottom, the lowest stirring rod 401 extends out of the mixing area 303, and the top of the flocculation area 302 is provided with a drain pipe 5 extending out of the reactor 3. In the whole flocculation area 302, a flocculation layer is formed in the middle part, a water layer is formed in the upper part, and the flocculation layer gradually completes precipitation. The chemical agent and the sewage are fully mixed in the mixing area 303 through the stirring rod 401, and as the water is continuously supplied, the mixed sewage enters the flocculation area 302 from the mixing area 303 from the lower end of the cylinder 14 for further flocculation, so that the disturbance of the mixing process to the flocculation process is small, the whole flocculation process can be mixed and flocculated and precipitated, and the sewage treatment efficiency is improved.

For better implementation of the utility model, referring to fig. 1 and 2, in one embodiment, the bottom of the reactor 3 is provided with an annular sludge zone 301, the sludge zone 301 surrounds the lower end of the cylinder 14, the sludge zone 301 is connected with a sludge outlet pipe 6 to remove the internal sludge, the upper end of the cylinder 14 is level with the reactor 3, and the distance between the lower end and the bottom of the reactor 3 is 70-120 cm. The flocculated sludge will fall to the sludge zone 301 and be removed through the sludge outlet pipe 6.

Based on foretell oil field is with integration sewage treatment plant, its theory of operation is:

the oilfield sewage to be treated firstly enters the whole treatment device from the upper part of the first filter screen 13 in the filtering area 1, the sewage sequentially passes through the first filter screen 13 and the second filter screen 102, and is pumped between the second partition 201 and the side wall in the air floatation area 2 through the first water pump 12, the second partition 201 plays a role in blocking water, the sewage can enter between the second partition 201 and the overflow plate 202 through the lower side of the second partition 201, and is fully mixed with the gas conveyed by the dissolved air water pipe 11, so that suspended matters, oil and the like float upwards, and are scraped into an oil outlet groove formed by the L-shaped partition 9 through the slag scraping plate 10, and the pest oil outlet pipe 8 is removed. The sewage treated by the air floatation area 2 is conveyed into the mixing area 303 of the reactor 3 through the second water pump 7, the rotating shaft 4 is driven by the motor to rotate, so that the stirring rod 401 rotates, chemical agents are added from the top of the mixing area 303, the chemical agents and the sewage are fully stirred and mixed, the mixed sewage enters the flocculation area 302 from the lower part of the cylinder 14 to carry out flocculation precipitation, the generated precipitation enters the annular sludge area 301 below and is removed from the sludge outlet pipe 6, a flocculation layer is formed in the middle of the flocculation area 302, a water layer is formed at the upper part of the flocculation layer, and the water treated at the upper part is discharged through the water discharge pipe 5, so that the whole sewage treatment process is completed.

In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model. It will be apparent that the described embodiments are merely some, but not all, embodiments of the utility model. Based on these embodiments, all other embodiments that may be obtained by one of ordinary skill in the art without inventive effort are within the scope of the utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art may still combine, add or delete features of the embodiments of the present utility model or make other adjustments according to circumstances without any conflict, so as to obtain different technical solutions without substantially departing from the spirit of the present utility model, which also falls within the scope of the present utility model.

Claims

1. An integrated sewage treatment device for an oil field is characterized by comprising a filtering area (1), an air floatation area (2) and a reactor (3) which sequentially pass along the sewage flowing direction;

the reactor (3) is in a truncated cone shape with a big top and a big bottom, a horn-shaped cylinder (14) with a big top and a big bottom is arranged in the center of the reactor (3), a mixing area (303) is arranged on the inner side of the cylinder (14), a flocculation area (302) is arranged on the outer side of the cylinder, a rotating shaft (4) is vertically arranged in the mixing area (303), a plurality of stirring rods (401) are uniformly arranged on the rotating shaft (4) from top to bottom, and a drain pipe (5) extending out of the reactor (3) is arranged at the top of the flocculation area (302);

the filtering area (1) is communicated with the air floatation area (2) through a pipeline provided with a first water pump (12), and the air floatation area (2) is communicated with the flocculation area (302) of the reactor (3) through a pipeline provided with a second water pump (7).

2. The integrated sewage treatment device for oil fields according to claim 1, wherein an annular sludge area (301) is arranged at the bottom of the reactor (3), the sludge area (301) surrounds the lower end of the cylinder (14), the sludge area (301) is connected with a sludge outlet pipe (6) to remove internal sludge, the upper end of the cylinder (14) is flush with the reactor (3), and the distance between the lower end of the cylinder and the bottom of the reactor (3) is 70-120 cm.

3. The integrated wastewater treatment device for oil fields according to claim 1, wherein the stirring rod (401) sequentially increases in length from top to bottom, and the lowermost stirring rod (401) extends out of the mixing zone (303).

4. The integrated sewage treatment device for the oil field according to claim 1, wherein a first partition plate (101) is vertically arranged in the filtering area (1), a second filter screen (102) is embedded in the lower portion of the first partition plate (101), and a first filter screen (13) is obliquely arranged on the side wall of the filtering area (1) in the water incoming direction and the first partition plate (101).

5. The integrated sewage treatment device for oil fields according to claim 4, wherein one end of the first filter screen (13) is hinged on the side wall of the filtering area (1), the other end is abutted with the first partition board (101), and the inclination angle of the first filter screen (13) is 35-55 °.

6. The integrated sewage treatment device for the oil field according to claim 1, wherein a second partition plate (201) is vertically arranged in the air flotation zone (2), the distance between the bottom of the second partition plate (201) and the bottom of the air flotation zone (2) is 60-100 cm, an overflow plate (202) arranged at the bottom of the air flotation zone (2) is vertically arranged on one side of the second partition plate (201) close to the reactor (3), a dissolved air water pipe (11) externally connected with a dissolved air tank is arranged between the second partition plate (201) and the overflow plate (202), an L-shaped partition plate (9) is arranged on the upper part of the side wall of the air flotation zone (2) close to one side of the reactor (3), an oil outlet groove is formed between the L-shaped partition plate (9) and the side wall, oil in the oil outlet groove is discharged through an oil outlet pipe (8) on the side wall, and a slag scraping plate (10) is arranged on one side of the L-shaped partition plate (9) away from the oil outlet pipe (8).

7. The integrated sewage treatment device for oil fields according to claim 4, characterized in that the mesh diameter of the first filter screen (13) is larger than the mesh diameter of the second filter screen (102).

8. The integrated sewage treatment device for oil fields according to claim 6, wherein the top of the second partition plate (201) is flush with the top of the side wall of the air floatation area (2), and the top of the overflow plate (202) is lower than the top of the second partition plate (201).

9. The integrated oilfield sewage treatment device of claim 1, wherein the chemical agent is introduced from the top of the mixing zone (303).

10. The integrated sewage treatment device for oil fields according to claim 1, wherein the filtering zone (1), the air flotation zone (2) and the reactor (3) form an integral device.