CN220811962U

CN220811962U - Integrated oily sewage treatment device

Info

Publication number: CN220811962U
Application number: CN202322260277.5U
Authority: CN
Inventors: 于惠娟; 王智; 任晓晶; 傅莉; 张舒漫; 刘海丽; 韩冰
Original assignee: China Petroleum and Chemical Corp; Sinopec Oilfield Service Corp; Sinopec Petroleum Engineering Corp
Current assignee: China Petroleum and Chemical Corp; Sinopec Oilfield Service Corp; Sinopec Petroleum Engineering Corp
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-04-19
Anticipated expiration: 2033-08-22

Abstract

The utility model discloses an integrated oily sewage treatment device which comprises a shell, wherein an oil-gas-water separation chamber, an aqueous oil buffer chamber and a sewage treatment chamber are sequentially arranged in the shell according to the flowing direction of liquid, the oil-gas-water separation chamber is used for carrying out oil, gas and water three-phase separation treatment on crude oil produced liquid, the aqueous oil buffer chamber is used for buffering the aqueous oil separated from the oil-gas-water separation chamber before the outer conveying, and the sewage treatment chamber is used for carrying out oil removal treatment on the aqueous oil. The integrated oily sewage treatment device provided by the utility model combines the functions of separating water from the crude oil produced liquid and treating the sewage into a whole, treats the oily sewage on site, directly separates part of sewage in the crude oil produced liquid and treats the part of sewage to the reinjection standard, has high treatment efficiency and strong impact resistance, ensures stable effluent quality, does not need additional water treatment equipment, greatly shortens the process flow, reduces the occupied area of equipment, and eliminates the technical difficulty affecting the implementation of the in-situ water separation reinjection.

Description

Integrated oily sewage treatment device

Technical Field

The utility model belongs to the technical field of oilfield exploitation, relates to treatment of produced liquid, and particularly relates to an integrated oily sewage treatment device.

Background

As the oil field enters the development period with high water content, the liquid yield is increased continuously, and the existing produced liquid treatment system is difficult to adapt to the increasing gathering and transportation and treatment requirements of the liquid yield in the high water content period. In addition, some small and medium-sized blocks are far away from the main oil area, and produced liquid is mainly conveyed to an established combined station by a tank truck for treatment. The existing produced liquid treatment system mainly has the following problems: the system is mostly operated in overload, and the energy consumption is high; (2) partial sewage quality does not reach the standard; (3) the capacity-increasing and reconstruction engineering amount and investment of the system are huge; and (4) sewage is conveyed back and forth for a long distance, and the treatment efficiency is low. The research and development integrated oily sewage treatment device can treat oily sewage on site, effectively solve the problem of oily sewage treatment and reduce the energy consumption of petroleum exploitation.

Disclosure of utility model

The utility model aims to provide an integrated oily sewage treatment device which integrates the functions of separating crude oil produced liquid and treating sewage into a whole and is used for treating oily sewage on site so as to solve the problems that produced liquid in the existing produced liquid treatment system needs to be transported or transported to an established joint station for treatment, thereby leading to sewage round-trip transportation and low treatment efficiency.

In order to achieve the above object, the present utility model provides the following solutions:

The utility model provides an integrated oily sewage treatment device which comprises a shell, wherein an oil-gas-water inlet is formed in the shell, an oil-gas-water separation chamber, an aqueous oil buffer chamber and a sewage treatment chamber are sequentially arranged in the shell according to the flowing direction of liquid, the oil-gas-water separation chamber is used for carrying out oil, gas and water three-phase separation treatment on crude oil produced liquid, the aqueous oil buffer chamber is used for buffering the aqueous oil separated by the oil-gas-water separation chamber before the outer conveying, and the sewage treatment chamber is used for carrying out oil removal treatment on the aqueous oil.

Optionally, the shell is a cylindrical horizontal tank, the oil-gas-water inlet is provided with a rotational flow pre-separation cylinder, and the oil-gas-water separation chamber, the water-containing oil buffer chamber and the sewage treatment chamber are sequentially arranged along the axial direction of the cylindrical horizontal tank.

Optionally, a rectifying chamber located at the upstream of the oil-gas-water separation chamber along the liquid flowing direction is further arranged in the shell, a liquid inlet and distribution pipe is arranged at the bottom of the cyclone preseparation cylinder, a liquid outlet hole is formed at the bottom of the liquid inlet and distribution pipe, and the bottom of the liquid inlet and distribution pipe extends below the liquid level in the rectifying chamber;

The liquid inlet rectifying plate is suspended in the shell, the top of the liquid inlet rectifying plate is higher than the top of the liquid inlet rectifying plate, and the bottom of the liquid inlet rectifying plate is lower than the top of the liquid inlet rectifying plate.

Optionally, the liquid inlet liquid distribution pipe is a T-shaped liquid distribution pipe or a rice-shaped liquid distribution pipe.

Optionally, a sewage buffer chamber located at the downstream of the sewage treatment chamber along the liquid flowing direction is further arranged in the shell, a sewage buffer chamber water outlet and a sewage buffer chamber liquid level meter interface are arranged on the sewage buffer chamber, the sewage buffer chamber water outlet is used for being connected with a sewage discharge pipeline, a flowmeter is arranged on the sewage discharge pipeline, and the sewage buffer chamber liquid level meter interface is used for being externally connected with a liquid level meter; the sewage treatment chamber with sewage buffer chamber is followed have set gradually oil baffle and sewage buffer chamber overflow plate between the liquid flow direction, the top of oil baffle with the casing links to each other, the bottom of oil baffle with the casing interval arrangement, the bottom of sewage buffer chamber overflow plate with the casing links to each other, the top of sewage buffer chamber overflow plate is higher than the bottom of oil baffle.

Optionally, the cyclone preseparation cylinder is a cyclone type gas-liquid separator.

Optionally, a surface modified inclined plate coalescing filler is arranged in the oil-gas-water separation chamber, and a baffle plate is arranged at the lower part of the inlet side of the surface modified inclined plate coalescing filler and connected with the shell;

The upper part of the oil-gas-water separation chamber is provided with a gas-liquid baffle and a gas collecting bag, a mist capturing net is arranged in the gas collecting bag, and an outlet gas pipeline of the gas collecting bag is connected with an outlet gas pipeline of the cyclone preseparation cylinder; the gas-liquid baffle is arranged at the lower part of the gas collecting bag and is obliquely arranged towards the rectification chamber.

Optionally, the water-containing oil buffer chamber comprises a water-containing oil buffer chamber overflow plate and a water-containing oil buffer chamber back plate which are sequentially arranged along the flowing direction of the liquid, the bottom of the water-containing oil buffer chamber overflow plate is connected with the shell, the top of the water-containing oil buffer chamber overflow plate is positioned below the gas-liquid baffle, and the periphery of the water-containing oil buffer chamber back plate is connected with the shell so as to separate the water-containing oil buffer chamber from the sewage treatment chamber; a water-containing oil buffer chamber bottom plate is connected between the bottom of the water-containing oil buffer chamber overflow plate and the bottom of the water-containing oil buffer chamber rear plate, and the water-containing oil buffer chamber bottom plate and the shell are arranged at intervals to form a water passing channel so as to be communicated with the oil-gas-water separation chamber and the sewage treatment chamber; the water-oil buffer chamber is provided with a water-oil buffer chamber liquid level meter interface for externally connecting a liquid level meter; the bottom plate of the water-containing oil buffer chamber is provided with an oil outlet of the water-containing oil buffer chamber, the oil outlet of the water-containing oil buffer chamber is connected with an oil discharge pipe of the water-containing oil buffer chamber, and the oil discharge pipe of the water-containing oil buffer chamber extends out of the shell.

Optionally, the lower parts of the oil-gas-water separation chamber and the water-containing oil buffer chamber are both provided with a sand collecting bag, the sand collecting bag is provided with a sand washing water inlet, and the sand washing water inlet is connected with a sand washing water pipe.

Optionally, a sewage treatment chamber dosing port is arranged on the sewage treatment chamber and used for adding a water treatment medicament into the sewage treatment chamber; the sewage treatment chamber is internally provided with a woven fiber coalescent filler, the lower part of the woven fiber coalescent filler is connected with the shell through a sewage treatment chamber liquid inlet baffle, and the sewage treatment chamber is separated from the sewage buffer chamber through a sewage treatment chamber rear plate; an oil collecting cavity is arranged at the upper part of the woven fiber coalescent filler and close to the rear plate of the sewage treatment chamber, an overflow plate is arranged on the oil collecting cavity to collect floating oil at the upper part of the woven fiber coalescent filler, an oil collecting cavity oil outlet is arranged on the oil collecting cavity, and an oil floating pipeline of the oil collecting cavity oil outlet is connected with the oil outlet of the water-containing oil buffer chamber; the upper part and the lower part of the sewage treatment chamber rear plate are arranged at intervals between the shell; the sewage treatment chamber is provided with a sewage treatment chamber flushing water inlet for cleaning the braided fiber coalescent filler;

the lower part and the upper part of the sewage treatment chamber are respectively provided with an air floatation air inlet and an air floatation air outlet, and the air floatation air inlet is also connected with a gas releaser.

Compared with the prior art, the utility model has the following technical effects:

The integrated oily sewage treatment device provided by the utility model combines the functions of separating water from the crude oil produced liquid and treating the sewage into a whole, treats the oily sewage on site, directly separates part of sewage in the crude oil produced liquid and treats the part of sewage to the reinjection standard, has high treatment efficiency and strong impact resistance, ensures stable effluent quality, does not need additional water treatment equipment, greatly shortens the process flow, reduces the occupied area of equipment, and eliminates the technical difficulty affecting the implementation of the in-situ water separation reinjection.

In some technical schemes provided by the utility model, a plurality of devices such as a rectifying chamber, an oil-gas-water three-phase separator, sewage treatment equipment, a sewage buffer tank and the like are integrated in a modularized manner, and the device has the functions of oil-water separation, produced water treatment and buffer, is an oily sewage treatment device with simplified flow, medicament saving, complete functions, closed treatment, occupied area saving and investment saving, is suitable for front-end treatment of well head, well group or marginal small oilfield well drainage liquid and treatment of offshore platform liquid, and can reach the index of on-site reinjection of sewage.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an integrated oily wastewater treatment device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the structure of a surface modified swash plate coalescing packing as disclosed in an embodiment of the utility model.

Wherein, the reference numerals are as follows:

1-oil-gas water inlet, 2-rotational flow preseparation cylinder, 3-surface modified inclined plate coalescing filler, 4-gas-liquid baffle, 5-gas collecting bag, 6-water-containing oil buffer chamber back plate, 7-woven fiber coalescing filler, 8-oil collecting chamber, 9-oil collecting chamber oil outlet, 10-sewage treatment chamber back plate, 11-sewage buffer chamber overflow plate, 12-liquid inlet liquid distribution pipe, 13-drain outlet, 14-sand collecting bag, 15-sand flushing water inlet, 16-sand flushing water pipe, 17-water-containing oil buffer chamber oil outlet, 18-water-containing oil buffer chamber liquid level meter interface, 19-sewage treatment chamber liquid inlet baffle, 20-sewage buffer chamber water outlet, 21-sewage buffer chamber liquid level meter interface, 22-liquid inlet overflow plate, 23-liquid inlet rectifying plate, 24-water-containing oil buffer chamber overflow plate, 25-water channel, 26-sewage treatment chamber medicine adding port, 27-sewage treatment chamber flushing water inlet, 28-air floating air outlet, 29-air floating air inlet and 30-gas releaser.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims to provide an integrated oily sewage treatment device which integrates the functions of separating crude oil produced liquid and treating sewage into a whole and is used for treating oily sewage in situ so as to solve the problems that produced liquid in the existing produced liquid treatment system needs to be transported or transported to an established joint station for treatment, thereby leading to sewage round-trip transportation and low treatment efficiency.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Example 1

As shown in fig. 1, the present embodiment provides an integrated oily sewage treatment device 100, specifically an integrated water treatment device with oil-gas-water three-phase separation function and water treatment function, which includes a housing 101 and a rectifying chamber 102, an oil-gas-water separation chamber 103, an aqueous oil buffer chamber 104, a sewage treatment chamber 105 and a sewage buffer chamber 106 sequentially arranged in the housing 101 along the liquid flow direction. The rectification chamber 102 mainly plays a role in medium rectification and steady flow; the oil-gas-water separation chamber 103 is mainly used for separating oil, gas and water from produced liquid, so as to reduce the water content of crude oil; the water-containing oil buffer chamber 104 is mainly used for buffering the sewage before the sewage is output; the sewage treatment chamber 105 is used for further degreasing treatment of sewage; the sewage buffer chamber 106 is mainly used for buffering the sewage before the sewage is output. The integrated water treatment device combines the functions of separating water from crude oil produced liquid and treating sewage into a whole, so that the sewage treatment efficiency can be improved.

In this embodiment, as shown in fig. 1, the housing 101 is preferably a cylindrical horizontal tank, based on which the integrated oily sewage treatment device 100 has a horizontal structure as a whole, and the rectifying chamber 102, the oil-gas-water separation chamber 103, the aqueous oil buffer chamber 104, the sewage treatment chamber 105 and the sewage buffer chamber 106 are arranged in the housing 101 in this order from left to right. The upper part of the left end of the shell 101 is vertically provided with a cyclone pre-separation cylinder 2, and the cyclone pre-separation cylinder 2 is a cyclone type gas-liquid separator and can perform preliminary gas-liquid separation on produced liquid. The bottom of the cyclone preseparation cylinder 2 is vertically provided with a T-shaped or rice-shaped or liquid inlet and distribution pipe 12 penetrating through the rectifying chamber 102, the lower part of the liquid inlet and distribution pipe 12 is provided with a small liquid outlet hole, the bottom end of the liquid inlet and distribution pipe 12 extends below the liquid level in the rectifying chamber 102, and coalescence and separation of water drops in the oil phase are promoted by water washing. The outlet gas pipeline at the upper part of the cyclone preseparation cylinder 2 is connected with the outlet gas pipeline of the gas collecting bag 5. The crude oil produced liquid enters the rectifying chamber 102, passes through the liquid inlet overflow plate 22 and the liquid inlet rectifying plate 23, and enters the oil-gas-water separation chamber 103, and the rectifying chamber 102 mainly plays a role in medium rectification and steady flow. The upper part of the liquid inlet rectifying plate 23 is provided with a certain gas phase height, and the lower part is provided with a liquid outlet space.

In this embodiment, as shown in fig. 1, the oil-gas-water separation chamber 103 is used as a three-phase separation chamber, and is used for separating oil, gas and water from the produced liquid, so as to reduce the water content of crude oil. As shown in fig. 2, the oil-gas-water separation chamber 103 is internally provided with a surface modified sloping plate coalescing filler 3, adopts a sloping plate structure to carry out crude oil dehydration and sewage oil removal, and utilizes the shallow pool principle to shorten the migration path of oil and water and improve the separation efficiency. The liquid passes through the flow channel limited by the two adjacent inclined plates, the surface of the upper inclined plate is modified by adopting polytetrafluoroethylene or polyacrylate and other lipophilic paint, and the surface of the lower inclined plate is modified by adopting stainless steel or nanometer hydrophilic paint and the like, so that oil drops are convenient to coalesce and float on the wall surface of the upper inclined plate. When sewage flows through, the sewage is favorable for forcing oil molecules in the water to float upwards and gradually gather, and the gathering effect of the oil molecules in the sewage is further improved. The lower part of the inlet side of the surface modified sloping plate coalescing packing 3 is provided with a baffle plate which is connected with the shell 101 in a sealing way so as to prevent the water phase from being shorted. The upper part of the oil-gas-water separation chamber 103 is provided with a gas-liquid baffle 4 and a gas collecting bag 5, a mist capturing net is arranged in the gas collecting bag 5, oil-gas-water is separated in the oil-gas-water separation chamber 103, the flow rate of the separated natural gas is measured by a flowmeter of an outlet pipeline of the gas collecting bag 5, and the natural gas enters a natural gas treatment system after the pressure is controlled by a self-operated regulating valve. The gas-liquid baffle 4 is arranged at the lower part of the gas collecting bag 5 and is provided with an inclined angle, so that the collision probability of liquid mist carried in gas is increased, and then the liquid mist is aggregated to form liquid beads to be settled down, and the liquid content in the gas phase is reduced. The above surface-modified swash plate coalescing packing 3 is a prior art and will not be described in detail.

In this embodiment, as shown in fig. 1, after the produced water is partially separated by the oil-gas-water separation chamber 103, the water content is reduced, and when the liquid level of the oil layer is higher than the top of the water-oil buffer chamber overflow plate 24, the produced water slowly flows into the water-oil buffer chamber 104, and is then discharged from the water-oil buffer chamber oil outlet 17 at the lower part of the water-oil buffer chamber 104. The aqueous oil buffer chamber 104 communicates with an aqueous oil buffer chamber oil outlet 17 on the housing. The water-containing oil buffer chamber 104 is provided with two water-containing oil buffer chamber level meter interfaces 18 which are connected with a level meter outside the device, and the liquid level in the water-containing oil buffer chamber 104 is detected by the level meter. An electric regulating valve is arranged on a pipeline connected with an oil outlet 17 of the water-containing oil buffer chamber, the opening of the regulating valve is controlled in a linkage manner with an external liquid level meter of the device, the liquid level of the water-containing oil buffer chamber 104 is controlled, and the oil discharging speed is regulated.

A water channel 25 is reserved below the water-containing oil buffer chamber 104 to communicate the oil-gas-water separation chamber 103 and the sewage treatment chamber 105, and sewage at the bottom of the oil-gas-water separation chamber 103 can enter the sewage treatment chamber 105 through the water channel 25 for further treatment. The water in the liquid phase region of the oil-gas-water separation chamber 103 is settled and separated to the lower layer of the oil-gas-water separation chamber 103, and enters the sewage treatment chamber 105 through the water passage 25 by the action of the pressure difference.

The oil-gas-water separation chamber 103 and the water-oil buffer chamber 104 are respectively provided with a group of sand collecting bag 14, a sand washing water inlet 15 and a sand washing water pipe 16 below, wherein the sand collecting bag 14 is arranged on the shell 101, and the sand washing water inlet 15 and the sand washing water pipe 16 are arranged on the sand collecting bag 14. By adopting the hydraulic sand removal technology, the double-row sand washing water pipes 16 are arranged, so that sand removal can be performed without stopping production.

In this embodiment, the sewage treatment chamber 105 uses fiber coalescence and air flotation to treat oil and suspended substances in water, so as to realize advanced sewage treatment. The sewage treatment chamber 105 is provided with a sewage treatment chamber dosing port 26 on the shell, a sewage treatment chamber liquid inlet baffle 19 and a woven fiber coalescent filler 7 are arranged in the sewage treatment chamber, and the sewage treatment chamber 105 is separated from a sewage buffer chamber 106 by a sewage treatment chamber rear plate 10. The chemical adding port 26 of the sewage treatment chamber is positioned at the middle lower part of the rear plate 6 of the water-containing oil buffer chamber and the liquid inlet baffle 19 of the sewage treatment chamber, is connected with chemical adding pipelines in and outside the device and is used for adding water treatment agents such as flocculating agent, oxidation-reduction agent, disinfectant and the like. The water treatment agent is added here, and the amount of the water treatment agent can be effectively reduced as compared with the case where the water treatment agent is added at the oil-gas-water inlet 1 of the housing 101.

In the sewage treatment chamber 105, an oil collecting chamber 8 is provided at the upper part of the woven fiber coalescing filler 7, adjacent to the rear plate 10 of the sewage treatment chamber. The floating oil on the upper part of the packing of the woven fiber coalescence 7 enters the oil collecting cavity 8 through the overflow plate of the oil collecting cavity 8, and leaves the sewage treatment chamber 105 through the oil collecting cavity oil outlet 9, so that the floating oil is discharged out of the device. The oil collecting cavity 8 can prevent the separated oil slick and sewage from interfering with each other, and the separation effect is affected. The oil floating pipeline of the oil collecting cavity oil outlet 9 is connected with the oil outlet 17 of the water-containing oil buffer chamber, and the crude oil is discharged out of the device. The upper and lower parts of the back plate 10 of the sewage treatment chamber are provided with gas phase and liquid phase spaces, and the periphery of the back plate is connected with the shell 101 in a sealing way.

The sewage treatment chamber flushing water inlet 27 is connected with the inner flushing water pipeline and the outer flushing water pipeline of the device and is used for cleaning the woven fiber coalesced filler 7. The air flotation gas enters a gas releaser 30 from an air flotation gas inlet 29, and the micro oil drops which cannot be separated by gravity sedimentation are separated by utilizing the air flotation effect of the associated gas in the produced liquid of the oil well, so that the floating oil generated by the air flotation enters the oil collecting cavity 8 through the sewage treatment cavity rear plate 10, leaves the sewage treatment cavity 105 through the oil collecting cavity oil outlet 9, and is discharged out of the device.

In this embodiment, the oil baffle and the sewage buffer chamber overflow plate 11 are sequentially disposed between the sewage buffer chamber 106 and the sewage treatment chamber 105 along the liquid flowing direction, the top of the oil baffle is connected with the housing 101, the bottom of the oil baffle is arranged at intervals with the housing 101, the bottom of the sewage buffer chamber overflow plate 11 is connected with the housing 101, the top of the sewage buffer chamber overflow plate 11 is higher than the bottom of the oil baffle, the top of the sewage buffer chamber overflow plate 11 is arranged at intervals with the housing 101, after the sewage reaches the oil baffle, the sewage flows to the sewage buffer chamber overflow plate 11 through the interval between the bottom of the oil baffle and the housing 101, and finally enters the sewage buffer chamber 106 through the interval between the top of the sewage buffer chamber overflow plate 11 and the housing 11. The sewage buffer chamber 106 is provided with a sewage buffer chamber water outlet 20 and a sewage buffer chamber liquid level meter interface 21 on a shell, a mass flowmeter or an electromagnetic flowmeter is arranged on a pipeline connected with the sewage buffer chamber water outlet 20 to detect the water yield separated by the separator, an electric regulating valve is arranged, the sewage buffer chamber liquid level meter interface 21 is connected with a liquid level meter, the electric regulating valve is interlocked with the liquid level meter to control the water level of the sewage buffer chamber 106, and the drainage speed is regulated.

Therefore, the integrated three-phase separation and water treatment device of the technical scheme is characterized in that a plurality of structures such as an oil-gas-water three-phase separator, a sewage treatment device and a sewage buffer device are integrated in a modularized manner, has the functions of oil-water separation, produced water treatment and buffer, is a separation device with simplified flow, medicament saving, complete functions, airtight treatment, occupied area saving and investment saving, is suitable for front-end treatment of well head, well group or marginal small oil field well drainage liquid and treatment of offshore platform liquid, and can reach the index of on-site reinjection of sewage.

It should be noted that it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims

1. The integrated oily sewage treatment device is characterized by comprising a shell, wherein an oil-gas-water inlet is formed in the shell, an oil-gas-water separation chamber, an aqueous oil buffer chamber and a sewage treatment chamber are sequentially arranged in the shell according to the liquid flowing direction, the oil-gas-water separation chamber is used for carrying out oil, gas and water three-phase separation treatment on crude oil produced liquid, the aqueous oil buffer chamber is used for buffering the aqueous oil separated by the oil-gas-water separation chamber before the outer conveying, and the sewage treatment chamber is used for carrying out oil removal treatment on the aqueous oil.

2. The integrated oily sewage treatment device according to claim 1, wherein the shell is a cylindrical horizontal tank, the oil-gas-water inlet is provided with a cyclone preseparation cylinder, and the oil-gas-water separation chamber, the aqueous oil buffer chamber and the sewage treatment chamber are sequentially arranged along the axial direction of the cylindrical horizontal tank.

3. The integrated oily sewage treatment device according to claim 2, wherein a rectifying chamber which is positioned at the upstream of the oil-gas-water separation chamber along the liquid flowing direction is further arranged in the shell, a liquid inlet liquid distribution pipe is arranged at the bottom of the cyclone preseparation cylinder, a liquid outlet hole is arranged at the bottom of the liquid inlet liquid distribution pipe, and the bottom of the liquid inlet liquid distribution pipe extends below the liquid level in the rectifying chamber;

4. The integrated oily wastewater treatment device of claim 3, wherein the liquid inlet liquid distribution pipe is a T-shaped liquid distribution pipe or a rice-shaped liquid distribution pipe.

5. The integrated oily sewage treatment device according to claim 3, wherein a sewage buffer chamber positioned downstream of the sewage treatment chamber along the liquid flow direction is further arranged in the shell, a sewage buffer chamber water outlet and a sewage buffer chamber liquid level meter interface are arranged on the sewage buffer chamber, the sewage buffer chamber water outlet is used for being connected with a sewage discharge pipeline, a flowmeter is arranged on the sewage discharge pipeline, and the sewage buffer chamber liquid level meter interface is used for being externally connected with a liquid level meter; the sewage treatment chamber with sewage buffer chamber is followed have set gradually oil baffle and sewage buffer chamber overflow plate between the liquid flow direction, the top of oil baffle with the casing links to each other, the bottom of oil baffle with the casing interval arrangement, the bottom of sewage buffer chamber overflow plate with the casing links to each other, the top of sewage buffer chamber overflow plate is higher than the bottom of oil baffle.

6. The integrated oily wastewater treatment device of any one of claims 2-5, wherein the cyclone preseparation cartridge is a cyclone gas-liquid separator.

7. The integrated oily wastewater treatment device of claim 5, wherein a surface modified sloping plate coalescing filler is arranged in the oil-gas-water separation chamber, and a baffle plate is arranged at the lower part of the inlet side of the surface modified sloping plate coalescing filler and is connected with the shell;

8. The integrated oily wastewater treatment device of claim 7, wherein the oily wastewater buffer chamber comprises an oily wastewater buffer chamber overflow plate and an oily wastewater buffer chamber back plate sequentially arranged along the liquid flow direction, wherein the bottom of the oily wastewater buffer chamber overflow plate is connected with the shell, the top of the oily wastewater buffer chamber overflow plate is positioned below the gas-liquid baffle, and the periphery of the oily wastewater buffer chamber back plate is connected with the shell to separate the oily wastewater buffer chamber from the wastewater treatment chamber; a water-containing oil buffer chamber bottom plate is connected between the bottom of the water-containing oil buffer chamber overflow plate and the bottom of the water-containing oil buffer chamber rear plate, and the water-containing oil buffer chamber bottom plate and the shell are arranged at intervals to form a water passing channel so as to be communicated with the oil-gas-water separation chamber and the sewage treatment chamber; the water-oil buffer chamber is provided with a water-oil buffer chamber liquid level meter interface for externally connecting a liquid level meter; the bottom plate of the water-containing oil buffer chamber is provided with an oil outlet of the water-containing oil buffer chamber, the oil outlet of the water-containing oil buffer chamber is connected with an oil discharge pipe of the water-containing oil buffer chamber, and the oil discharge pipe of the water-containing oil buffer chamber extends out of the shell.

9. The integrated oily sewage treatment device according to claim 8, wherein sand collecting bags are arranged at the lower parts of the oil-gas-water separation chamber and the water-oil buffer chamber, sand washing water inlets are arranged on the sand collecting bags, and sand washing water pipes are connected to the sand washing water inlets.

10. The integrated oily sewage treatment device of claim 9, wherein a sewage treatment chamber dosing port is provided on the sewage treatment chamber for dosing a water treatment agent to the sewage treatment chamber; the sewage treatment chamber is internally provided with a woven fiber coalescent filler, the lower part of the woven fiber coalescent filler is connected with the shell through a sewage treatment chamber liquid inlet baffle, and the sewage treatment chamber is separated from the sewage buffer chamber through a sewage treatment chamber rear plate; an oil collecting cavity is arranged at the upper part of the woven fiber coalescent filler and close to the rear plate of the sewage treatment chamber, an overflow plate is arranged on the oil collecting cavity to collect floating oil at the upper part of the woven fiber coalescent filler, an oil collecting cavity oil outlet is arranged on the oil collecting cavity, and an oil floating pipeline of the oil collecting cavity oil outlet is connected with the oil outlet of the water-containing oil buffer chamber; the upper part and the lower part of the sewage treatment chamber rear plate are arranged at intervals between the shell; the sewage treatment chamber is provided with a sewage treatment chamber flushing water inlet for cleaning the braided fiber coalescent filler;