CN116675385A - Air-float synergistic oil-water separation treatment device - Google Patents

Abstract

The invention relates to the technical field of oilfield sewage treatment, in particular to an air floatation enhanced oil-water separation treatment device, which comprises a rotational flow air floatation oil-water separator, wherein a first water outlet is arranged on the rotational flow air floatation oil-water separator, the first water outlet is connected with a first water inlet pipe of an air floatation enhanced oil-water separation horizontal tank to form a U-shaped pipe structure, the rotational flow air floatation oil-water separator is communicated with the air floatation enhanced oil-water separation horizontal tank, a second water outlet of the air floatation enhanced oil-water separation horizontal tank is communicated with a sewage treatment system through a water outlet pipeline, a return pipe communicated with the air floatation enhanced oil-water separation horizontal tank and the rotational flow air floatation oil-water separator is arranged on the water outlet pipeline to form a structure for realizing circulation separation of liquid flowing out through the second water outlet through the return pipe, and an air outlet of the rotational flow air floatation oil-water separator and an air inlet of the air floatation enhanced oil-water separation horizontal tank are communicated through a pipeline to solve the problem of low efficiency of separation equipment in the prior art.

Description

Air flotation synergistic oil-water separation treatment device

technical field

The invention belongs to the technical field of oilfield sewage treatment, in particular to an air flotation synergistic oil-water separation treatment device.

Background technique

With the deepening of the development of major oilfields, the water cut of oil wells continues to rise, and the development and station construction model in the early stage of low water cut is no longer suitable for high water cut oil production. For oilfields in remote areas or oilfields with extra-high water content whose production fluid is increasing year by year, oil production sewage needs to be transported over long distances in a concentrated manner, which has problems such as high energy consumption, high treatment costs, and unguaranteed water quality. In order to overcome the limitations of the existing pre-water separation facilities for gathering and transportation and produced liquid treatment systems, an on-site water separation and treatment device for oilfields with high efficiency, small footprint, and low investment is required. At present, "on-site water separation and on-site reinjection" have become the main means to improve economic benefits in high water-cut oilfields, especially the short, small and precise oilfield pre-water separation short-process treatment technology has become a simplified process, Urgent need to save investment, reduce energy consumption and operating costs.

At present, the pre-separation equipment mainly includes hydrocyclones, chamber separators, inclined tube pre-separators, three-phase separators, multi-functional crude oil treatment combined devices, full-gravity balance oil-gas-water treatment integrated devices and integrated pre-separators. decanter. Most of the current pre-water separation devices only involve one or several technologies, and the goals of on-site water separation, on-site treatment and on-site reinjection cannot be achieved by using them alone.

It is understood that there are mainly two types of operating technologies, one is the "three-phase separator + pressure degreaser" technology, and the other is the "integrated short-process on-site water separation" technology. Both of these two in-situ water separation processes can meet On-site process requirements, but the integrated short-process on-site water separation process mainly has the disadvantages of complex process and high maintenance cost, while the "three-phase separation + degreaser" process mainly has the disadvantages of long process and unstable water quality. Therefore, it is necessary to design on-demand according to the space and water quality requirements in the station.

At present, domestic oilfields generally use three-phase separator equipment for pre-separation of water, and the oil content of the separated sewage is relatively high, so it is necessary to build a conventional sewage treatment system. Oil tank→settling tank→air flotation→buffer tank→lift pump→filter→fine filter→water outlet". The sewage treatment process is complex, not integrated and skid-mounted, occupying a large area, high investment, unable to meet the needs of process simplification, and the separated sewage is basically transported to the combined station for treatment, and it is impossible to realize on-site water division and on-site Target for processing, re-injecting in-place. In order to overcome the limitations of the existing water pre-separation facilities in the gathering and transportation and produced liquid treatment system, an oilfield on-site water separation treatment device with high treatment efficiency, small footprint and low investment is needed.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an air flotation synergistic oil-water separation treatment device to solve the problem of low efficiency of the prior art oil-water separation equipment.

The technical solution is that the air flotation synergistic oil-water separation treatment device includes a swirl air flotation oil-water separator, and the swirl air flotation oil-water separator is provided with a first water outlet, and the first water outlet is connected to the air flotation synergistic oil-water separation platform. The first water inlet pipe of the type tank is connected to form a swirl air flotation oil-water separator to communicate with the air flotation synergistic oil-water separation horizontal tank and form a U-shaped pipe structure. The second water outlet of the air flotation synergistic oil-water separation horizontal tank passes through the water The outlet pipeline is connected with the sewage treatment system, and the water outlet pipeline is provided with a return pipe connected with the air flotation synergistic oil-water separation horizontal tank and the cyclone air flotation oil-water separator, so that the liquid flowing out of the second water outlet can be circulated through the return pipe In the separated structure, the air outlet of the cyclone air flotation oil-water separator and the air inlet of the air flotation synergistic oil-water separation horizontal tank are connected through pipelines.

Preferably, the air flotation synergistic oil-water separation horizontal tank includes a tank body, the two ends of the tank body in the length direction are provided with inlets for maintenance personnel to enter, and the end of the tank body close to the water inlet pipe is provided with a rectifying plate, A slant plate group is provided in the tank close to the rectifying plate, an oil chamber is provided at one end of the swash plate group far away from the rectifying plate, a water chamber is provided at the end of the oil chamber far away from the swash plate group, and a water chamber is arranged in the water chamber to be fixed on the tank body. The adjustable weir pipe, the end of the adjustable weir pipe far away from the tank body communicates with the end of the inclined plate group close to the oil chamber through the second water inlet pipe, and the side of the water chamber far away from the oil chamber is provided with a second water outlet.

Preferably, the first water inlet pipe is communicated with an adjustable weir pipe fixed to the tank body, and the position close to the adjustable weir pipe on the tank body is connected to an emptying device through an exhaust port, and the tank body is provided with a sewage outlet. There are multiple sewage outlets.

Preferably, the return pipe includes a branch pipe, a return port is provided on the tank body and between the rectifying plate and the inclined plate group, and the swirl air flotation oil-water separator is far away from a horizontal tank of the air flotation synergistic oil-water separation tank. A liquid inlet is provided on the side, and there are two branch pipes which communicate with the return port and the liquid inlet respectively.

The beneficial effect of the present invention is that a return pipe is provided, and the effluent of the air flotation synergistic oil-water separation horizontal tank enters the swirl tube through the return pipe, and the oil-water separation is realized under the double action of swirl centrifugal and air flotation, and the swirl air flotation oil-water separator and air The floating and synergistic oil-water separation horizontal tank adopts "U-shaped connection", relying on the "U" pipe balance principle to establish a fixed liquid level, the purified water is discharged from the "U" outlet weir pipe, and the top scum layer is automatically collected and discharged by the central slag discharge pipe ;

The cyclone air flotation oil-water separator and the air flotation synergistic oil-water separation horizontal tank device are small in size, easy to install, high in efficiency, and large in processing capacity. The air flotation synergistic backflow method is adopted, and the oil-water separation effect is good and the index is stable; the cyclone air flotation oil-water separation There are diversion channels, swirl tubes, settling tubes, and oil and water tanks inside the device. Each part has clear functions and is interrelated. Plate settlement, air flotation separation, multiple separation areas, using the produced gas to achieve air flotation efficiency in the tank; this device can be used as a metering station, oil gathering station or combined station pre-dehydration equipment to realize on-site dehydration of crude oil and on-site treatment and reinjection , to reduce transportation and heating energy consumption; it can also be used as oily sewage degreasing equipment to replace natural settling tanks, and has a wide range of applications; compared with conventional treatment equipment, the processing cost can be reduced by more than 50%. The workshop prefabricated combined skid assembly is adopted, which occupies a small space and requires less on-site installation work, which can greatly shorten the construction period.

Description of drawings

Fig. 1 is a structural diagram of an air flotation synergistic oil-water separation treatment device of the present invention;

Among them, 1 cyclone air flotation oil-water separator, 2 first water outlet, 3 air flotation synergistic oil-water separation horizontal tank, 4 first water inlet pipe, 5 second water outlet, 6 water outlet pipeline, 7 sewage treatment system connection, 8 Return pipe, 9 air inlet, 10 pipeline, 11 tank body, 12 inlet, 13 rectifying plate, 14 inclined plate group, 15 oil chamber, 16 water chamber, 17 adjustable weir pipe, 18 venting equipment, 19 sewage outlet, 20 Branch pipe, 21 return port, 22 liquid inlet, 23 air outlet, 24 exhaust port.

Detailed ways

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Embodiment 1: According to the accompanying drawings of the description, the air flotation synergistic oil-water separation treatment device includes a cyclone air flotation oil-water separator 1, which is a prior art, and the production fluid is drawn from the bottom of the cyclone cylinder along the Enter the cyclone cylinder in the tangential direction, rotate upwards, and rotate up to enter the upper part of the cyclone cylinder. Under the action of centrifugal force, the water with higher density is thrown to the outer wall of the cylinder, and the crude oil and oil-gas mixture with lower density are thrown to the outer wall of the cylinder. The heavy water pressure is directed towards the outer wall of the inner cylinder, and the oil droplets and air bubbles are combined because the density is lower than that of the surrounding water, and the oil droplets are floated by the rise of the air bubbles. The center cylinder flows out of the device after being controlled by the liquid level; the water thrown to the outer wall of the cyclone cylinder enters the air flotation separation cylinder and then swirls downward around the wall of the cyclone cylinder, while the dissolved gas in the water plays the role of adsorption, coalescence and floating After the oil and water are further settled and separated, the clean water in the lower part enters the bottom water collection tank, and then enters the clean water tank through the specially designed "U"-shaped connecting pipe from the aqueduct, and flows out after being measured and controlled by the liquid level. device. So as to achieve the separation of oil, gas and water phase. The cyclone air flotation oil-water separator 1 is provided with a first water outlet 2, and the first water outlet 2 is connected with the first water inlet pipe 4 of the air flotation synergistic oil-water separation horizontal tank 3 to form the cyclone air flotation oil-water separator 1 and the air The floating and synergistic oil-water separation horizontal tank 3 is connected and forms a U-shaped tube structure, and a fixed liquid level is established by relying on the "U"-shaped tube balance principle. The air flotation synergistic oil-water separation horizontal tank 3 belongs to the prior art. The purified sewage after being separated and treated by the cyclone air flotation oil-water separator 1 enters this equipment. The packing layer, while increasing the radius of the oil droplets, filters large-size impurities, and after the oil-water separation is carried out in the inclined plate settlement area, the separated dirty oil and purified sewage are collected separately through the adjustable weir, and are transported to the corresponding pipelines respectively. in the device. The equipment has stable working conditions, high degree of automation, and is easy to manage. An air-filling and reflux device is installed in the horizontal tank to achieve air flotation and increase efficiency, while reducing the volume of the equipment and improving the stability of the operation of the equipment. The second water outlet 5 of the air flotation synergistic oil-water separation horizontal tank 3 communicates with the sewage treatment system 7 through the water outlet pipeline 6, and the water outlet pipeline 6 is provided with the air flotation synergistic oil-water separation horizontal tank 3 and the cyclone air flotation The return pipe 8 connected to the oil-water separator 1 forms a structure in which the liquid flowing out through the second water outlet 5 passes through the return pipe 8 to realize circulation and separation. The air inlet 9 of 3 communicates through the pipeline 10.

In one embodiment, as shown in the drawings, the air flotation synergistic oil-water separation horizontal tank 3 includes a tank body 11, and both ends of the tank body 11 in the length direction are provided with inlets 12 for maintenance personnel to enter, and the tank body 11 The middle position is also set with population 12. One end of the tank body 11 close to the water inlet pipe is provided with a rectifying plate 13, the rectifying plate 13 belongs to the prior art, and a sloping plate group 14 is provided at a position close to the rectifying plate 13 in the tank body 11, and the end of the sloping plate group 14 far away from the rectifying plate 13 An oil chamber 15 is provided. The end of the oil chamber 15 away from the swash plate group 14 is provided with a water chamber 16, and the adjustable weir pipe 17 fixed on the tank body 11 is arranged in the water chamber 16, and the end of the adjustable weir pipe 17 away from the tank body 11 passes through the second inlet The water pipe communicates with one end of the swash plate group 14 close to the oil chamber 15 , and the side of the water chamber 16 away from the oil chamber 15 is provided with a second water outlet 5 . The first water inlet pipe 4 communicates with the adjustable weir pipe 17 fixed to the tank body 11, and the position close to the adjustable weir pipe 17 on the tank body 11 is connected with an emptying device 18 through the exhaust port 24, and the tank body 11 is provided with a sewage outlet 19. There are multiple sewage outlets 19, and there are sewage outlets 19 under the oil chamber 15, the water chamber 16, the bottom of the inclined plate group 14, and the vicinity of the rectifying plate 13. The return pipe 8 includes a branch pipe 20, and the tank body 11 is provided with a return port 21 at a position between the rectifying plate 13 and the inclined plate group 14. The swirl air flotation oil-water separator 1 is far away from the air flotation synergistic oil-water separation horizontal tank 3. One side is provided with a liquid inlet 22, and there are two branch pipes 20 which communicate with the return port 21 and the liquid inlet 22 respectively.

In the present invention, by setting a return pipe, the effluent of the air flotation synergistic oil-water separation horizontal tank enters the swirl cylinder through the return pipe, and realizes the oil-water separation under the double action of swirl centrifugation and air flotation, and the swirl air flotation oil-water separator and air flotation synergy The oil-water separation horizontal tank adopts "U-shaped connection", relying on the "U" pipe balance principle to establish a fixed liquid level, the purified water is discharged from the "U" outlet weir pipe, and the top scum layer is automatically collected and discharged by the central slag discharge pipe; the swirling gas The floating oil-water separator and the air flotation synergistic oil-water separation horizontal tank device are small in size, easy to install, high in efficiency, and large in processing capacity. The air flotation synergistic backflow method is adopted, and the oil-water separation effect is good and the index is stable; the cyclone air flotation oil-water separator Equipped with diversion channels, swirl tubes, settling tubes and oil and water tanks, each part has clear functions and is interrelated, compact structure, air flotation synergistic oil-water separation horizontal tank, set coarse-grained filter plate, inclined plate settlement , air flotation separation, multiple separation areas, using the produced gas to achieve air flotation efficiency in the tank; this device can be used as a metering station, oil gathering station or combined station pre-dehydration equipment to realize on-site dehydration of crude oil and on-site treatment and re-injection, reducing Transportation and heating energy consumption; it can also be used as oily sewage degreasing equipment to replace natural settling tanks, with a wide range of applications; compared with conventional treatment equipment, the processing cost can be reduced by more than 50%. The workshop prefabricated combined skid assembly is adopted, which occupies a small space and requires less on-site installation work, which can greatly shorten the construction period.

The present invention has been described in detail through specific implementations and examples above, but these are not intended to limit the present invention. Without departing from the principle of the present invention, those skilled in the art can also make many modifications and improvements, which should also be regarded as the protection scope of the present invention.

Claims (4)

1. Air flotation synergistic oil-water separation treatment device, including a cyclone air flotation oil-water separator (1), characterized in that the cyclone air flotation oil-water separator (1) is provided with a first water outlet (2), the first The water outlet (2) is connected to the first water inlet pipe (4) of the air flotation synergistic oil-water separation horizontal tank (3) to form a swirling air flotation oil-water separator (1) and the air flotation synergistic oil-water separation horizontal tank (3) ) connected and form a U-shaped pipe structure, the second water outlet (5) of the air flotation synergistic oil-water separation horizontal tank (3) is connected with the sewage treatment system (7) through the water outlet pipeline (6), and the water outlet pipeline (6) ) is provided with a return pipe (8) communicating with the air flotation synergistic oil-water separation horizontal tank (3) and the cyclone air flotation oil-water separator (1), forming the liquid flowing out through the second water outlet (5) through the return pipe (8) A structure to realize circulation separation, the air outlet (23) of the cyclone air flotation oil-water separator (1) and the air inlet (9) of the air flotation synergistic oil-water separation horizontal tank (3) are connected through the pipeline (10). 2. The air flotation synergistic oil-water separation treatment device according to claim 1, characterized in that the air flotation synergistic oil-water separation horizontal tank (3) includes a tank body (11), and the length direction of the tank body (11) is Both ends of the tank are provided with inlets (12) for maintenance personnel to enter, and a rectifying plate (13) is provided at the end of the tank body (11) close to the water inlet pipe, and a rectifying plate (13) is provided in the tank body (11) close to the rectifying plate ( 13) is provided with a sloping plate group (14), the end of the sloping plate group (14) away from the rectifying plate (13) is provided with an oil chamber (15), and the end of the oil chamber (15) away from the swash plate group (14) is provided There is a water chamber (16), and an adjustable weir pipe (17) fixed to the tank body (11) is arranged in the water chamber (16), and the end of the adjustable weir pipe (17) away from the tank body (11) passes through the second The water inlet pipe communicates with one end of the inclined plate group (14) close to the oil chamber (15), and the side of the water chamber (16) away from the oil chamber (15) is provided with a second water outlet (5). 3. The air flotation synergistic oil-water separation treatment device according to claim 2, characterized in that the first water inlet pipe (4) is connected with an adjustable weir pipe (17) fixed to the tank (11), and the tank The position close to the adjustable weir pipe (17) on the tank body (11) is connected with an emptying device (18) through the exhaust port (24), and the tank body (11) is provided with a sewage outlet (19), and the sewage outlet (19) MULTI-TIME. 4. The air flotation synergistic oil-water separation treatment device according to claim 2, characterized in that, the return pipe (8) includes a branch pipe (20), and the tank body (11) is located on the rectifying plate (13) There is a return port (21) at the position between the inclined plate group (14), and a liquid inlet ( 22), there are two branch pipes (20) which communicate with the return port (21) and the liquid inlet port (22) respectively.