CN115893692A - Three-dimensional device and process for treating produced water - Google Patents
Three-dimensional device and process for treating produced water Download PDFInfo
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- CN115893692A CN115893692A CN202110891215.7A CN202110891215A CN115893692A CN 115893692 A CN115893692 A CN 115893692A CN 202110891215 A CN202110891215 A CN 202110891215A CN 115893692 A CN115893692 A CN 115893692A
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Abstract
The invention provides a three-dimensional device for treating produced water, which comprises: the device comprises a buffer water tank, an air floatation unit, a filter tank, an ultraviolet sterilizer, a purification water tank and a controller; an inlet of the buffer water tank is connected with a production pipeline; an inlet of the air floatation unit is communicated with an outlet of the buffer water tank, and an air floatation device and a chain type slag scraper are arranged in the air floatation unit; the inlet of the filter tank is communicated with the outlet of the air floatation unit, and a filter layer is arranged in the filter tank; the inlet of the ultraviolet sterilizer is communicated with the outlet of the filter tank; the inlet of the purified water tank is communicated with the outlet of the ultraviolet sterilizer, and the outlet of the purified water tank is connected with a reinjection pipeline; the signal input end of the controller is connected with a pressure difference detection device and a plurality of liquid level detection devices through signal lines, and the air flotation unit and the filter tank can be controlled to operate according to signals of the pressure difference detection device and the liquid level detection devices. The invention also provides a produced water treatment process which is implemented by adopting the produced water treatment three-dimensional device.
Description
Technical Field
The invention belongs to the field of oilfield development ground construction engineering, and particularly relates to a three-dimensional produced water treatment device and process.
Background
At present, most water-driven oil reservoirs enter the middle and later stages of development, the water content of oil fields is high, the water-driven control degree is low, along with the annual modification of stratum oil reservoirs and the continuous addition of demulsifying agents and the like, when the oil reservoirs are developed to the later stage, the property difference between produced water and water-driven produced water in the previous stage is large, emulsified oil is increased, the gravity separation difficulty is large, the particle amount in water is large, but the particle size is small, and sedimentation is difficult. Meanwhile, a plurality of oil reservoir development blocks are small, the produced water yield is also small, the construction cost of a conventional produced water treatment system is high, the period is long, the occupied area is large, and the operation automation degree is low.
Disclosure of Invention
In view of the above, the present invention provides a produced water treatment stereoscopic apparatus and process for overcoming the above problems or at least partially solving or alleviating the above problems.
A three-dimensional device for produced water treatment comprises:
the inlet of the buffer water tank is connected with a produced pipeline for introducing produced water;
an inlet of the air flotation unit is connected with an outlet of the buffer water tank through a pipeline, and an air flotation device and a chain type slag scraping machine are arranged in the air flotation unit;
the inlet of the filter tank is communicated with the outlet of the air floatation unit through a pipeline, and a filter layer is arranged in the filter tank;
the inlet of the ultraviolet sterilizer is connected with the outlet of the filter tank through a pipeline;
an inlet of the purified water tank is communicated with an outlet of the ultraviolet sterilizer through a pipeline, and an outlet of the purified water tank is connected with a reinjection pipeline and used for reinjecting the stratum;
the controller, the signal input part of controller is connected with pressure differential detection device and a plurality of liquid level detection device through the signal line, pressure differential detection device sets up in filtering tank 3, liquid level detection device sets up in buffer tank, air supporting unit and the purification water tank, the controller can be according to pressure differential detection device with liquid level detection device's signal control air supporting unit and filtering tank's operation.
The produced water treatment stereo device of the invention also has the following optional features.
Optionally, the air flotation unit comprises a first air flotation lift pump and a first air flotation tank; the inlet of the first air floatation lift pump is communicated with the outlet of the buffer water tank, the outlet of the first air floatation lift pump is communicated with the inlet of the first air floatation tank, and the chain type slag scraper is arranged in the upper port of the first air floatation tank.
Optionally, a cavitation aerator is further disposed in the first air flotation tank of the first air flotation lift pump.
Optionally, the air floating unit further comprises a second air floating lift pump and a second air floating box; and the inlet of the second air-floatation lifting pump is communicated with the outlet of the first air-floatation tank, and the outlet of the second air-floatation lifting pump is communicated with the inlet of the second air-floatation tank.
Optionally, the air flotation unit further comprises a nitrogen making device, the nitrogen making device is communicated with the second air flotation tank through a pipeline, and the pipeline between the nitrogen making device and the second air flotation tank is sequentially connected with an adjusting valve, a nitrogen dissolved air pump and a nitrogen dissolved air tank.
Optionally, the device further comprises a backwashing water tank, an inlet of the backwashing water tank is connected with an outlet of the ultraviolet sterilizer through a pipeline, an outlet of the backwashing water tank is communicated with a water outlet side of the filtering layer in the filtering tank through a pipeline, an inlet of the filtering tank is further connected with a backwashing bypass pipeline, and the backwashing bypass pipeline is communicated with an inlet pipeline of the air flotation unit; and a pipeline at the outlet of the backwashing water tank is connected with a filtering backwashing pump.
Optionally, two pressure filtration pumps are connected in parallel to the inlet pipeline of the filtration tank.
Optionally, the buffer water tank, the purification water tank and the backwash water tank are respectively provided with an overflow port and a vent port, and the overflow port and the vent port are connected with an overflow vent pipeline.
Optionally, buffer tank, air supporting unit, filtration jar and purified water tank constitute two-layer sled dress structure of dismantling, buffer tank with purified water tank is located the air supporting unit is in with the top of crossing the jar.
The invention also provides a produced water treatment process which is implemented by adopting the three-dimensional produced water treatment device and comprises the following steps:
s001: injecting the produced water into a buffer water tank;
s002: pumping the produced water from the buffer water tank and injecting the pumped produced water into a first air flotation tank to carry out cavitation air flotation and slag scraping on the produced water;
s003: pumping the produced water subjected to slag scraping in the first air flotation tank into a second air flotation tank for nitrogen injection air flotation and slag scraping;
s004: pumping the produced water subjected to slag scraping in the second air flotation tank into a filter tank for filtering;
s005: sterilizing the filtered produced water by an ultraviolet sterilizer;
s006: introducing a part of sterilized produced water into a purified water tank for reinjection into the stratum;
s007: and (4) introducing part of the sterilized produced water into a backwashing water tank, and backwashing the filter tank.
The three-dimensional device and the process for treating the produced water can flexibly separate, settle and sterilize small-particle-size particles in a small amount of produced water in a small block of oil well, and can realize automatic control and even remote operation of main functions; the produced water treatment three-dimensional device is convenient to move, recycle and quickly install, has short design period and sputtering period and small occupied area, can provide powerful technical support for small-block oil reservoir development, and has wide application prospect.
Drawings
FIG. 1 is a schematic system diagram of a produced water treatment stereo apparatus of the present invention.
In the above figures, 1 buffers the water tank; 101 a production pipeline; 2, a chain type slag scraper; 3, filtering the tank; 301 a filter layer; 302 backwashing the bypass line; 4, an ultraviolet sterilizer; 5 purifying the water tank; 501 reinjection pipeline; 6 backwashing the water tank; 7, a first air flotation tank; 8, a cavitation aerator; 9 a second air flotation tank; 10 a first air lift pump; 11 a second air-floatation lift pump; 12 a nitrogen making device; 13 adjusting valve; 14 a nitrogen gas dissolving pump; 15, a nitrogen dissolved air tank; 16 filtration backwash pump; 17 a filtration pressure pump; 18 an overflow vent line; 19 sewage pipes.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
Referring to fig. 1, the present invention provides a produced water treatment three-dimensional device, comprising: the device comprises a buffer water tank 1, an air flotation unit, a filter tank 3, an ultraviolet sterilizer 4, a purified water tank 5 and a controller; an inlet of the buffer water tank 1 is connected with a production pipeline 101 for introducing produced water; an inlet of the air floatation unit is connected with an outlet of the buffer water tank 1 through a pipeline, and an air floatation device and a chain type slag scraper 2 are arranged in the air floatation unit; an inlet of the filter tank 3 is communicated with an outlet of the air floatation unit through a pipeline, and a filter layer 301 is arranged in the filter tank 3; the inlet of the ultraviolet sterilizer 4 is connected with the outlet of the filter tank 3 through a pipeline; an inlet of the purified water tank 5 is communicated with an outlet of the ultraviolet sterilizer 4 through a pipeline, and an outlet of the purified water tank 5 is connected with a reinjection pipeline 501 for reinjection into a stratum; the signal input end of the controller is connected with a pressure difference detection device and a plurality of liquid level detection devices through signal lines, the pressure difference detection device is arranged in the filtering tank 3, the liquid level detection devices are arranged in the buffer water tank 1, the air floatation unit and the purification water tank 5, and the controller can control the air floatation unit and the filtering tank 3 to operate according to signals of the pressure difference detection device and the liquid level detection devices.
Produced water separated from the gathering and transportation system enters a buffer water tank 1, enters an air floatation unit to remove floating slag and floating oil in the produced water after buffering adjustment and gravity settling, then is introduced into a filter tank 3 to filter out 3/4 suspended matters through a filter layer 301, the filter layer adopts different levels of filter media to achieve the optimal filtering effect, and then passes through an ultraviolet sterilizer 5, the ultraviolet sterilizer 5 can effectively kill iron bacteria, sulfate reducing bacteria and saprophytic bacteria, and effectively prevent toxic and harmful gases such as hydrogen sulfide and the like from generating and corroding downstream pipelines and facilities, and the treated produced water enters a purified water tank 5 to be stored and can be used for reinjecting strata. The controller can be in signal connection with a remote manufacturing system through network signals, can realize automatic control of main functions through flow, pressure and liquid level monitoring and pump state display of key nodes in the process, design of electric valves and the like, can upload real-time data states, can realize remote monitoring operation, and can master device processing conditions in detail.
Example 2
Referring to fig. 1, on the basis of embodiment 1, the air flotation unit comprises a first air flotation lift pump 10 and a first air flotation tank 7; the inlet of the first air-float lifting pump 10 is communicated with the outlet of the buffer water tank 1, the outlet of the first air-float lifting pump 10 is communicated with the inlet of the first air-float tank 7, and the chain type slag scraper 2 is arranged in the upper port of the first air-float tank 7.
The produced water in the buffer water tank 1 is pumped into the first air flotation tank 7 through the first air flotation lifting pump 10, the scum floating oil in the first air flotation tank 7 is taken to the water surface along with the bubbles, the chain type slag scraper 2 can scrape the scum floating oil on the surface of the first air flotation tank 7 out, and the scum floating oil is finally introduced into a sewage discharge pipeline. The bottom of the first air flotation tank 7 is also communicated with a sewage discharge pipeline, and sediments can be discharged. Wherein, be provided with height liquid level detection device in buffer tank 1, first air supporting elevator pump 10 interlocks with height liquid level detection device, and when height liquid level detection device detected buffer tank 1 in the liquid level higher, first air supporting elevator pump 10 started, sent into first air supporting tank 7 with the produced water in buffer tank 1.
Example 3
Referring to fig. 1, on the basis of embodiment 2, the first air-bearing lift pump is further provided with a cavitation aerator 8 in the first air-bearing tank 7.
The cavitation aerator 8 generates and cuts bubbles, the steam pocket rises to the water surface in the produced water in the first air flotation tank 7, scum floating oil is brought to the water surface, and the scum floating oil is scraped out by the chain type slag scraper 2 and is discharged in a centralized way.
Example 4
Referring to fig. 1, on the basis of embodiment 2, the air floating unit further comprises a second air floating lift pump 11 and a second air floating box 9; the inlet of the second air-floating lifting pump 11 is communicated with the outlet of the first air-floating box 7, and the outlet of the second air-floating lifting pump 11 is communicated with the inlet of the second air-floating box 9.
The produced water is sent to a second air flotation tank 9 by a second air flotation lifting pump 11 after being cleared of floating slag and floating oil by a first air flotation tank 7 and a chain type slag scraper 2 therein, and the floating slag and floating oil is finally sent to a sewage discharge pipeline 19. The bottom of the second air flotation tank 9 is also communicated with a sewage discharge pipeline 19, and sediments can be discharged. Wherein, be provided with height liquid level detection device in the first air supporting case 7, height liquid level detection device and second air supporting elevator pump 11 interlock, when height liquid level detection device detects that the liquid level is higher in the first air supporting case 7, second air supporting elevator pump 11 lets in the produced water in the second air supporting case 9.
Example 5
Referring to fig. 1, on the basis of embodiment 3, the air flotation unit further includes a nitrogen making device 12, the nitrogen making device 12 is communicated with the second air flotation tank 9 through a pipeline, and a regulating valve 13, a nitrogen dissolving pump 14 and a nitrogen dissolving tank 15 are sequentially connected to the pipeline between the nitrogen making device 12 and the second air flotation tank 9.
The nitrogen prepared by the nitrogen preparation device 12 is mixed with the produced water through the nitrogen dissolved air pump 14 and the nitrogen dissolved air tank 15 after being regulated by the regulating valve 13, enters the second-stage air flotation tank 9, carries the floating slag and floating oil in the second-stage air flotation tank 9 to the water surface, and is removed by the chain type slag scraper 2. Because the second air supporting tank 9 is used for scraping slag and discharging the bottom of the second air supporting tank by gravity, the situation of unsmooth discharge is possible, compressed gas can be formed by the nitrogen making device 12 and the pressure regulating valve 13 to perform gas purging on the ground section of the discharge pipeline, and the blocking situation is reduced.
Example 6
Referring to fig. 1, on the basis of embodiment 1, the air floatation device further includes a backwash water tank 6, an inlet of the backwash water tank 6 is connected to an outlet of the ultraviolet sterilizer 4 through a pipeline, an outlet of the backwash water tank 6 is communicated to a water outlet side of the filter layer 301 in the filter tank 3 through a pipeline, an inlet of the filter tank 3 is further connected to a backwash bypass pipeline 302, and the backwash bypass pipeline 302 is communicated with an inlet pipeline of the air floatation unit; and a filtering backwashing pump 16 is connected to a pipeline at the outlet of the backwashing water tank 6.
Part of the produced water after being filtered and sterilized by the filter tank 3 and the ultraviolet sterilizer 4 is introduced into the backwashing water tank 6, when the filter layer 301 in the filter tank 3 needs to be backwashed, the produced liquid can be extracted from the backwashing water tank 6 through the filtering backwashing pump 16 and pressurized, the pressurized produced liquid reversely flows into the filter tank 3 from the outlet pipeline of the backwashing water tank 6, the filter layer 301 in the filter tank 3 is backwashed and washed, and the washed produced water flows into the inlet pipeline of the air floatation unit through the backwashing bypass pipeline 302 to be subjected to air floatation treatment. Wherein, be provided with pressure differential detection device in filtering jar 3, be provided with liquid level detection device in the backwash water tank 6, the pressure differential of the front and back side that filters the filter layer 301 of jar 3 is greater than the setting value, and when backwash water tank 6 liquid level reached the limit value simultaneously, filter backwash pump 16 automatic start, carry out the backwash to filter layer 301 in filtering jar 3. The filtration backwash pump 16 may also be set to start on a timed basis to achieve a timed backwash.
Example 7
Referring to fig. 1, in example 1, two filtration pressurizing pumps 17 are connected in parallel to the inlet pipe of the filtration tank 3.
The filtration pressurizing pump 17 pressurizes the produced liquid so that the produced liquid can pass through the filter layer 301 in the filtration tank 3. Wherein, have liquid level detection device in the purified water tank 5, when liquid level detection device detects that the liquid level risees to preset the height in the purified water tank 5, carry out high liquid level warning and close filtration force (forcing) pump 17.
Example 8
Referring to fig. 1, on the basis of embodiment 1, an overflow port and a vent port are respectively arranged on the buffer water tank 6, the purified water tank 5 and the backwash water tank 6, and the overflow port and the vent port are connected with an overflow vent pipeline 18.
The overflow hole is located near the upper ports of the buffer water tank 6, the purified water tank 7 and the backwashing water tank 6, the vent port is located near the bottom plate, the overflow hole and the vent port are respectively communicated with the overflow vent pipeline 18, redundant produced liquid can be intensively discharged when necessary, and the accumulated produced liquid can also be intensively discharged when the system is maintained.
Example 9
Referring to fig. 1, on the basis of embodiment 1, the buffer water tank 1, the air flotation unit, the filter tank 3 and the purification water tank 5 form a two-layer detachable skid-mounted structure, and the buffer water tank 1 and the purification water tank 5 are located above the air flotation unit, the filter tank 3 and the controller.
Buffer tank 1 and purified water tank 5 do not have the vibration as water storage unit, establish it on the second floor, and the air supporting unit, filter jar 3, air supporting unit etc. have vibrations, set up at the first floor, can reduce overall structure's vibration range, and two-layer steel construction is detachable about being convenient for hoist and mount removal transportation moreover.
Example 10
The invention provides a produced water treatment process implemented by adopting the three-dimensional produced water treatment device, which comprises the following steps of: s001: injecting the produced water into a buffer water tank; s002: pumping the produced water from the buffer water tank and injecting the produced water into a first air flotation tank to carry out cavitation air flotation and slag scraping on the produced water; s003: pumping the produced water subjected to slag scraping in the first air flotation tank into a second air flotation tank for nitrogen injection air flotation and slag scraping; s004: pumping the produced water subjected to slag scraping in the second air flotation tank into a filter tank for filtering; s005: sterilizing the filtered produced water by an ultraviolet sterilizer; s006: introducing a part of sterilized produced water into a purified water tank for reinjection into the stratum; s007: and (4) introducing part of the sterilized produced water into a backwashing water tank, and backwashing the filter tank.
When the process is operated conventionally, produced water separated from the gathering and transportation system enters the buffer water tank 1, and the produced water is subjected to buffer adjustment and gravity settling in the buffer water tank 1; the produced water enters a first air flotation tank 7, bubbles are generated by cutting through a cavitation air flotation aerator 8, and the bubbles drive the floating oil and the finely dispersed oil to rise to the water surface to be scraped by a chain type slag scraper 2; the produced water enters the secondary air flotation tank 9 again, the nitrogen making device 12 leads nitrogen into the secondary air flotation tank 9 through the regulating valve 13, the nitrogen dissolved air pump 12 and the nitrogen dissolved air tank 15, floating slag and floating oil in the nitrogen bubbles are brought to the water surface, and then the chain type slag scraper 2 scrapes the floating slag and floating oil; the produced water in the secondary air flotation tank 9 enters the filter tank 3, suspended matters are removed through the two-stage multi-medium filter layer 301, and multiple filter media in the secondary air flotation tank adopt different grading combinations to achieve the optimal filtering effect; the filtered produced water enters a pipeline type ultraviolet sterilizer 4 to kill iron bacteria, sulfate reducing bacteria and saprophytic bacteria and prevent the generation of toxic and harmful gases such as hydrogen sulfide and the like and the corrosion to downstream pipelines and facilities; a part of the sterilized produced water enters a purified water tank 5 and is finally reinjected into the bottom layer; and the other part of the produced water after sterilization enters the backwashing water tank 6, and the filtering layer 301 in the filtering tank 3 can be backwashed when needed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A three-dimensional device for produced water treatment is characterized by comprising:
the device comprises a buffer water tank (1), wherein an inlet of the buffer water tank (1) is connected with a produced water pipeline (101) for introducing produced water;
an inlet of the air floatation unit is connected with an outlet of the buffer water tank (1) through a pipeline, and an air floatation device and a chain type slag scraping machine (2) are arranged in the air floatation unit;
the inlet of the filtering tank (3) is communicated with the outlet of the air floatation unit through a pipeline, and a filtering layer (301) is arranged in the filtering tank (3);
the inlet of the ultraviolet sterilizer (4) is connected with the outlet of the filter tank (3) through a pipeline;
the inlet of the purified water tank (5) is communicated with the outlet of the ultraviolet sterilizer (4) through a pipeline, and the outlet of the purified water tank (5) is connected with a reinjection pipeline (501) for reinjecting the stratum;
the air floatation filter comprises a controller, wherein a signal input end of the controller is connected with a pressure difference detection device and a plurality of liquid level detection devices through signal lines, the pressure difference detection device is arranged in a filter tank 3, the liquid level detection devices are arranged in a buffer water tank (1), an air floatation unit and a purification water tank (5), and the controller can control the air floatation unit and the filter tank (3) to operate according to signals of the pressure difference detection device and the liquid level detection devices.
2. The produced water treatment stereoscopic device of claim 1, wherein the air flotation unit comprises a first air flotation lift pump (10) and a first air flotation tank (7); the inlet of the first air flotation lift pump (10) is communicated with the outlet of the buffer water tank (1), the outlet of the first air flotation lift pump (10) is communicated with the inlet of the first air flotation tank (7), and the chain type slag scraper (2) is arranged in the upper port of the first air flotation tank (7).
3. The produced water treatment spatial apparatus according to claim 2, wherein a cavitation aerator (8) is further disposed in the first air flotation tank (7) of the first air flotation lift pump.
4. The produced water treatment stereoscopic device of claim 2, wherein the air flotation unit further comprises a second air flotation lift pump (11) and a second air flotation tank (9); the inlet of the second air-floating lifting pump (11) is communicated with the outlet of the first air-floating box (7), the outlet of the second air-floating lifting pump (11) is communicated with the inlet of the second air-floating box (9), and the chain type slag scraper (2) is arranged in the upper port of the second air-floating box (9).
5. The produced water treatment stereoscopic device according to claim 4, wherein the air flotation unit further comprises a nitrogen making device (12), the nitrogen making device (12) is communicated with the second air flotation tank (9) through a pipeline, and a regulating valve (13), a nitrogen dissolved air pump (14) and a nitrogen dissolved air tank (15) are sequentially connected to the pipeline between the nitrogen making device (12) and the second air flotation tank (9).
6. The produced water treatment stereoscopic device according to claim 1, further comprising a backwash water tank (6), wherein an inlet of the backwash water tank (6) is connected with an outlet of the ultraviolet sterilizer (4) through a pipeline, an outlet of the backwash water tank (6) is communicated with a water outlet side of the filter layer (301) in the filter tank (3) through a pipeline, an inlet of the filter tank (3) is further connected with a backwash bypass pipeline (302), and the backwash bypass pipeline (302) is communicated with an inlet pipeline of the air floatation unit; and a pipeline of the outlet of the backwashing water tank (6) is connected with a filtering backwashing pump (16).
7. The produced water treatment stereoscopic device according to claim 1, wherein two filtration pressure pumps (17) are connected in parallel to an inlet pipeline of the filtration tank (3).
8. The produced water treatment stereoscopic device according to claim 4, wherein the buffer water tank (6), the purification water tank (5) and the backwash water tank (6) are respectively provided with an overflow port and a vent port, and the overflow port and the vent port are connected with an overflow vent pipeline (18).
9. The produced water treatment stereo device according to any one of claims 1 to 8, characterized in that the buffer water tank (1), the air flotation unit, the filter tank (3) and the purification water tank (5) form a two-layer detachable skid-mounted structure, and the buffer water tank (1) and the purification water tank (5) are positioned above the air flotation unit and the filter tank (3).
10. The produced water treatment process is implemented by adopting the produced water treatment three-dimensional device of any one of claims 1 to 9, and is characterized by comprising the following steps of:
s001: injecting the produced water into a buffer water tank;
s002: pumping the produced water from the buffer water tank and injecting the pumped produced water into a first air flotation tank to carry out cavitation air flotation and slag scraping on the produced water;
s003: pumping the produced water subjected to slag scraping in the first air flotation tank into a second air flotation tank for nitrogen injection air flotation and slag scraping;
s004: pumping the produced water subjected to slag scraping in the second air flotation tank into a filter tank for filtering;
s005: sterilizing the filtered produced water by an ultraviolet sterilizer;
s006: introducing part of the sterilized produced water into a purified water tank for reinjection into the stratum;
s007: and (4) introducing a part of sterilized produced water into a backwashing water tank, and periodically backwashing the filter tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110891215.7A CN115893692A (en) | 2021-08-04 | 2021-08-04 | Three-dimensional device and process for treating produced water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110891215.7A CN115893692A (en) | 2021-08-04 | 2021-08-04 | Three-dimensional device and process for treating produced water |
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| CN115893692A true CN115893692A (en) | 2023-04-04 |
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