CN116177794B - Single well produced liquid reinjection skid-mounted device and produced liquid treatment method - Google Patents
Single well produced liquid reinjection skid-mounted device and produced liquid treatment method Download PDFInfo
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- CN116177794B CN116177794B CN202310049257.5A CN202310049257A CN116177794B CN 116177794 B CN116177794 B CN 116177794B CN 202310049257 A CN202310049257 A CN 202310049257A CN 116177794 B CN116177794 B CN 116177794B
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- 239000007788 liquid Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000003756 stirring Methods 0.000 claims abstract description 70
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- 238000001914 filtration Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 24
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 238000005192 partition Methods 0.000 claims description 14
- 238000005345 coagulation Methods 0.000 claims description 12
- 230000015271 coagulation Effects 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 7
- 238000007790 scraping Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 238000005238 degreasing Methods 0.000 claims description 5
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- 238000013327 media filtration Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/40—Separation associated with re-injection of separated materials
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Physical Water Treatments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Cyclones (AREA)
Abstract
A single well produced liquid reinjection skid-mounted device relates to the technical field of sewage recycling devices and comprises a cyclone separation module, an electrochemical treatment module, an air flotation treatment module, a double-filter material filtering module, a comprehensive dosing module, an ultrafiltration treatment system module and a pressurizing reinjection module; the cyclone separation module comprises a spiral coil pipe, a shunt pipe is arranged at the outlet of the spiral coil pipe, the outlet of the spiral coil pipe stretches into the shunt pipe, a vertical shunt plate A is arranged in the shunt pipe at the end, and the position of the shunt plate can be adjusted to enable the shunt plate to coincide with an oil-water separation boundary line as much as possible, so that the cyclone separation effect is greatly improved; the stirring blade of the air flotation processing module is internally provided with a centrifuge tube and a striking plate, and solid particles at the separation position can be separated while stirring, so that the air flotation processing effect is greatly improved. The invention can efficiently treat the produced liquid, reinject the produced liquid to an oil layer on site, greatly reduce the cost of energy consumption of sewage back and forth transportation and effectively reduce the load of a gathering and transportation pipeline network and a joint station.
Description
Technical Field
The invention belongs to the technical field of sewage recycling devices, and particularly relates to a single-well produced liquid reinjection skid-mounted device.
Background
At present, the oilfield produced fluid collection and transportation system mostly adopts a secondary (single well, metering station and joint station) and tertiary station arrangement (single well, metering station, transfer station and joint station) mode. The produced liquid enters a combination station for oil-water separation, and the separated sewage is concentrated and then returned to a water distribution room for pressurization reinjection after being concentrated in a sewage station. However, as the oil field enters a high water-containing period, a larger amount of sewage needs to be treated and reinjected, so that the energy consumption for conveying the sewage back and forth is increased; in addition, a large amount of sewage also brings a series of problems to the existing ground gathering and conveying system: firstly, the original gathering and conveying pipe network has limited conveying capacity and possibly cannot meet the requirement of conveying capacity, secondly, the treatment load of the combined station is increased, the treatment effect is poor, and if the same treatment index is required to be achieved, equipment is required to be increased, or the adding quantity and the sedimentation temperature are required to be increased, so that the treatment cost is increased.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a single well produced liquid reinjection skid-mounted device, which can carry out on-site water diversion and reinjection at the front end of a produced liquid collecting and conveying system and carry out water injection development again; greatly reduces the energy consumption cost of sewage round-trip conveying and effectively lightens the load of a gathering and conveying pipeline network and a joint station.
The technical scheme provided by the invention is as follows: a single well produced liquid reinjection skid-mounted device comprises a cyclone separation module, an electrochemical treatment module, an air floatation treatment module, a double filter material filtering module, a comprehensive dosing module, an ultrafiltration treatment system module and a pressurizing reinjection module; the single well produced liquid first enters a single well oil storage tank, the stored produced liquid enters a cyclone separation module, and the produced liquid achieves primary oil and water separation in the cyclone separation module. The oily sewage separated from the cyclone separation module continuously enters an electrochemical treatment module and an air floatation treatment module, and in the air floatation treatment module, the two-stage air floatation treatment of air floatation deslagging and air floatation degreasing is carried out, so that the effluent oil content and suspended solids are less than 50mg/L finally; the air-floating effluent enters the filtering treatment module, the produced water after passing through the two-stage filtering device enters the ultrafiltration treatment module, the aperture of the ultrafiltration membrane is about 0.002-0.1 micron, the produced water after being treated by the ultrafiltration membrane can completely reach the reinjection water standard of 511', the oil content of the produced water is less than 5mg/L, the suspended matters are less than 1mg/L, and the median particle size is less than 1.
The structure of cyclone separation module includes the separating tube, vertical pile has put a row of spiral coil in the separating tube, the entry end of all spiral coils is located the coil central authorities, the export of spiral coil is located the outer fringe of coil, the produced liquid gets into spiral coil by spiral coil central authorities, the radius increases gradually in the rotatory in-process, centrifugal force increases gradually, oil and water are because there is the density difference, the oil level that density is little in the spiral flow in-process is inboard, the water level that density is big is in the outside, form the boundary between oil and the water, the exit of spiral coil is provided with the shunt tubes, the export of spiral coil stretches into in the shunt tubes, be provided with the splitter plate A of erectting in the shunt tubes of this end, splitter plate A supports in the exit of spiral coil, splitter plate A is as far as possible with the oil-water separation boundary coincidence, thereby divide the oil and the water of spiral coil drain to flow, the other end of shunt tubes is connected with the branch liquid pipe of erectting, the splitter plate B has the splitter plate B equally in the branch liquid pipe, the oil and the water after guaranteeing the separation is in the contact of a body structure, the lower extreme is provided with the separating tank, the splitter plate is provided with the baffle, the partition plate is installed to the two lower extreme positions of baffle and can be fixed with the bolt of two partition plates, the side of the partition plate is fixed with the rotatory baffle, the two end of partition plates are fixed to the side of the partition plate is located at the outlet, the two partition plates are fixed by the rotatory side of the partition plate, the partition plate is fixed to the partition plate is located at the two side of the outlet.
The structure of the air floatation treatment module comprises an air floatation tank, a stirring assembly, a dissolved air assembly and a slag scraping assembly, wherein the air floatation tank comprises a coagulation stirring area and a dissolved air release area, the stirring assembly is positioned in the coagulation stirring area, the liquid flow of the coagulation stirring area flows to the dissolved air release area, the dissolved air assembly comprises anti-blocking releasers, the anti-blocking releasers are uniformly arranged at the lower part of the dissolved air release area, the anti-blocking releasers release tiny bubbles, and the surfaces of the bubbles are attached with oil droplets and solid particles which float upwards to the water surface; the slag scraping assembly is arranged at the upper part of the dissolved gas release area, and oil and solid particles are separated from water through scraping.
The stirring assembly comprises a stirring shaft and stirring blades, wherein a part of the stirring blades are hollow, a centrifugal tube is inserted into the stirring blades, an annular space is reserved between the centrifugal tube and the stirring blades, the center of the stirring shaft is of a hollow structure, one end of the centrifugal tube is fixedly connected with the stirring shaft and communicated with the stirring shaft, liquid enters the stirring shaft from the bottom, then enters the centrifugal tube, a large centrifugal force is generated in the stirring blades in the rotating process, the solid particles with large specific gravity are thrown out of the centrifugal tube first, the stirring blades corresponding to the other end of the centrifugal tube are fixedly connected with oblique striking plates, the solid particles strike the striking plates and change directions, the striking plates are arranged below the striking plates, the solid collecting grooves are fixedly connected with the stirring blades, the solid collecting pipes are sleeved outside the stirring shaft, the annular space is reserved between the stirring shaft and the solid collecting pipes, the solid collecting grooves are communicated with the solid collecting pipes, therefore, the lower ends of the stirring shaft extend out of the solid collecting pipes, the lower ends of the stirring shaft are sequentially provided with a solid separator storage space and a water inlet space, the solid separator storage space is communicated with the solid separator storage space, and finally enter the space below the solid separator storage space, and the solid separator storage space is in the space is in a sealed fit with the rotating mode.
The method for treating the produced liquid by using the single well produced liquid reinjection skid-mounted device comprises the following steps of:
a: the produced liquid enters a cyclone separation module, and primary oil and water separation is carried out on the produced liquid in the cyclone separation module;
b: the oily sewage separated from the cyclone separation module enters an electrochemical treatment module, and pollutants are degraded through anode reaction in the electrochemical treatment module;
c: the effluent after degradation by the electrochemical module continuously enters an air floatation treatment module, and in the air floatation treatment module, the two-stage air floatation treatment of air floatation deslagging and air floatation degreasing is carried out, so that the effluent oil content and suspended matters are less than 50mg/L finally;
d: the effluent treated by the air floatation treatment module enters a double-filter material filtering module, and suspended matters and oil are further removed through the double-filter material filtering module, wherein the removal rate of the suspended matters and the oil is 82-95%;
e: the effluent treated by the double-filter material filtering module enters an ultrafiltration treatment system module, and suspended matters, colloid, bacteria and microorganisms are intercepted in the ultrafiltration treatment system module to reach the reinjection standard;
f: and the water reaching the standard is reinjected into the oil layer through the pressurizing reinjection module.
The beneficial effects of the invention are as follows:
1. the invention also comprises a cyclone separation module, an electrochemical treatment module, an air floatation treatment module, a double-filter material filtering module, a comprehensive dosing module, an ultrafiltration treatment system module and a pressurizing reinjection module, wherein the produced liquid is treated by the modules in sequence, and the reinjection qualification rate is great. The invention takes the connectivity, consistency and rationality of the process steps into consideration, so that the treatment level of the domestic oil well produced liquid is improved by a new step.
2. In the cyclone separation module, the movable splitter plate is arranged at the outlet end of the cyclone coil, no matter how much the oil and water proportion of the separation liquid is, the boundary line of the oil and water cyclone separation is positioned at the position of the cyclone coil, and the splitter plate is overlapped with the boundary line of the oil and water separation to the greatest extent by moving the position of the splitter plate relative to the cyclone coil, so that the separation efficiency of the oil and the water in the cyclone separation process is higher, and the treatment difficulty is reduced for the subsequent process.
3. In the prior art, microbubbles cannot float solid particles with heavier specific gravity, and the time for removing the solid particles by a precipitation method is long. In the air flotation processing module, the stirring blade not only plays a role in stirring, but also plays a role in separating and removing solid particles with heavier specific gravity according to the centrifugal principle, so that the air flotation processing module has better solid particle removing capability, and the pressure of the subsequent double-filter material filtering module is greatly reduced.
Drawings
Fig. 1 is a top view of a portion of the construction of a cyclonic separating module of the present invention.
Fig. 2 is a view in the direction B in fig. 1.
Fig. 3 is a view in the direction a in fig. 1.
Fig. 4 is a front view of an air flotation process module in the present invention.
Fig. 5 is a schematic structural view of a stirring assembly in an air flotation process module according to the present invention.
Fig. 6 is a schematic structural view of an anti-blocking releaser in an air flotation process module according to the present invention.
Fig. 7 is a schematic structural view of a dual filter media filtration module according to the present invention.
Fig. 8 is a schematic structural view of a two-stage filter employing fiber balls in a dual-filter media filtration module according to the present invention.
Fig. 9 is a schematic perspective view of a boost refill module according to the present invention.
In the figure: 1. a separation cylinder; 2. a spiral coil; 3. a shunt; 4. a splitter plate A; 5. a splitter plate B; 6. a liquid separating pipe; 7. a separation tank; 8. a partition plate; 9. a fixing plate; 10. an air floatation tank; 11. a coagulation stirring area; 12. a dissolved gas release zone; 13. an anti-blocking releaser; 14. a solids separator storage space; 15. a water inlet space; 16. a stirring shaft; 17. stirring blades; 18. striking a plate; 19. centrifuging tube; 20. a solids collection tank; 21. a solid collecting pipe; 22. a fiber ball; 23. a main pipe; 24. and (3) gravel.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment is a single well produced liquid reinjection sled dress device, and its structure includes seven big modules, is respectively: the device comprises a cyclone separation module, an electrochemical treatment module, an air floatation treatment module, a double-filter-material filtering module, a comprehensive dosing module, an ultrafiltration treatment system module and a pressurizing and reinjection module; the single well produced liquid first enters a single well oil storage tank, the stored produced liquid enters a cyclone separation module, and the produced liquid achieves primary oil and water separation in the cyclone separation module. The oily sewage separated from the cyclone separation module continuously enters an electrochemical treatment module and an air floatation treatment module, and in the air floatation treatment module, the two-stage air floatation treatment of air floatation deslagging and air floatation degreasing is carried out, so that the effluent oil content and suspended solids are less than 50mg/L finally; the air-floating effluent enters the filtering treatment module, the produced water after passing through the two-stage filtering device enters the ultrafiltration treatment module, the aperture of the ultrafiltration membrane is about 0.002-0.1 micron, the produced water after being treated by the ultrafiltration membrane can completely reach the reinjection water standard of 511', the oil content of the produced water is less than 5mg/L, the suspended matters are less than 1mg/L, and the median particle size is less than 1.
As shown in fig. 1-3, the structure of the cyclone separation module comprises a vertical separation cylinder 1 positioned at the outer side, a row of spiral coils 2 are vertically piled up in the separation cylinder 1, the inlet ends of all the spiral coils 2 are positioned at the center of the coils, the outlet ends of the spiral coils 2 are positioned at the outer edges of the coils, produced liquid enters the spiral coils 2 from the center of the spiral coils 2, the rotation radius is gradually increased in the rotation process, the centrifugal force is gradually increased, oil and water are in density difference, the oil level with small density is positioned at the inner side of the coils in the spiral flow process, the water level with large density is positioned at the outer side of the coils, a boundary line is formed between the oil and the water, a shunt tube 3 is arranged at the outlet of the spiral coils 2, the outlet of the spiral coils 2 stretches into the shunt tube 3, the shunt tube 3 is a horizontal inclined downward inclined tube, and forms a high-low topography, and the purpose is to avoid overflow of liquid from the spiral coils 2, and one end is fixedly connected with the liquid separation tube 6. The splitter tube 3 at the end is internally provided with a vertical splitter plate A4, the splitter plate A4 is propped against the outlet of the spiral coil tube 2, and the splitter plate A4 is overlapped with an oil-water separation boundary line as far as possible, so that oil and water discharged from the spiral coil tube 2 are split, the other end of the splitter tube 3 is connected with a vertical splitter tube 6, the splitter tube 6 is internally provided with a vertical splitter plate B5, the splitter plate A4 and the splitter plate B5 are of an integrated structure, the separated oil and water are not contacted, the lower end of the splitter tube 6 is provided with a separation groove 7, the middle part of the separation groove 7 is provided with a vertical baffle 8, one side of the baffle 8 is used for collecting sewage, the other side of the baffle 8 is used for collecting dirty oil, the lower end of the splitter tube 6 is split into two outlets, the two outlets are respectively positioned at two sides of the baffle 8, the side face of the splitter tube 6 is provided with a vertical fixing plate 9, the fixing plate 9 is fixedly arranged on a cyclone separator, the fixing plate 9 is connected with the splitter tube 6 through bolts, and the position of the splitter tube 6 can be adjusted through the bolts so as to ensure that the split plate A4 is overlapped with the oil-water separation boundary line as far as possible.
As shown in fig. 4, the structure of the air floatation treatment module comprises an air floatation tank 10, a stirring assembly, an air dissolving assembly and a slag scraping assembly, wherein the air floatation tank 10 comprises a coagulation stirring area 11 and an air dissolving and releasing area 12, the stirring assembly is positioned in the coagulation stirring area 11, the liquid in the coagulation stirring area 11 flows to the air dissolving and releasing area 12, the air dissolving assembly comprises an anti-blocking releaser 13, the anti-blocking releaser 13 is uniformly arranged at the lower part of the air dissolving and releasing area 12, the anti-blocking releaser 13 releases tiny bubbles, and oil beads and solid particles in water attached to the surface of the bubbles float upwards; a scraper assembly is mounted on the upper part of the dissolved gas releasing zone 12 to separate oil and solid particles from water by a scraping action.
As shown in figure 5, the stirring assembly comprises a stirring shaft 16 and a stirring blade 17, wherein a part of the stirring blade 17 is hollow, a centrifugal tube 19 is inserted into the stirring blade 17, an annular space is reserved between the centrifugal tube 19 and the stirring blade 17, the center of the stirring shaft 16 is hollow, one end of the centrifugal tube 19 is fixedly connected and communicated with the stirring shaft 16, liquid enters the stirring shaft 16 from bottom to top and then enters the centrifugal tube 19, a large centrifugal force is generated in the centrifugal tube 19 in the rotation process of the stirring blade 17, solid particles with a large specific gravity are thrown out of the centrifugal tube 19 at first, a striking plate 18 with an inclined angle of 45 degrees is fixedly connected with the stirring blade 17 corresponding to the other end of the centrifugal tube 19, the solid particles are changed in direction after striking the striking plate 18, the striking plate 18 is arranged below a solid collecting tank 20, solid particles are sprung into the solid collecting tank 20, the solid collecting tank 20 is fixedly connected with the stirring blade 17, the solid collecting pipe 21 is sleeved outside the stirring shaft 16, an annular space is reserved between the stirring shaft 16 and the solid collecting pipe 21, the solid collecting tank 20 is communicated with the solid collecting pipe 21, therefore, the solid particles directly enter the solid collecting pipe 21, the lowest end of the stirring shaft 16 extends out of the solid collecting pipe 21, a solid separation object storage space 14 and a water inlet space 15 are sequentially arranged below a coagulation stirring area 11 of the floatation tank 10, the solid collecting pipe 21 is communicated with the solid separation object storage space 14, the solid particles finally enter the solid separation object storage space 14, the lower part of the stirring shaft 16 is communicated with the water inlet space 15 and is in rotary sealing fit, and liquid after being processed by the electrochemical treatment module is pumped into the water inlet space 15.
The performance of the dissolved air releaser directly influences the quality of the treated water. And is therefore critical to dissolved gas releaser selection. As shown in fig. 6, the anti-blocking releaser 13 has a pressure adjustment function, and when a plurality of release heads are employed, the pressure adjustment can make the release pressure of each release head the same. The anti-blocking release 13 of the present invention has the following advantages: 1. the automatic blockage is avoided, the operation is convenient, the labor intensity is reduced, and the trouble caused by shutdown and emptying cleaning of air floatation equipment due to easy blockage of other releasers is overcome; the released micro-bubbles have an average diameter of less than 25-30 μm. The air floatation efficiency is improved by more than one time; the retention time of the released dissolved air and water is more than 5 minutes, so that the solid-liquid separation is ensured to be in an optimal state; the released dissolved air water diffuses downwards and around at the same time, and the contact area of the dissolved air water is increased. The high-efficiency anti-blocking dissolved gas releaser can keep the pressure between the outlet of the dissolved gas pump and the dissolved gas release point unchanged, and the generated bubbles have small diameter, high concentration, uniform release and good stability; the outlet flow velocity is low, and large turbulence and flocculation breaking are not generated.
As shown in fig. 7, the dual filter material filtration treatment module adopts two-stage filtration, the primary filter adopts quartz sand and magnetite as the filter media, and the secondary filter adopts fiber balls 22 as the filter media.
The first-stage double-filter-material filter adopts the functions of air-water combined automatic backwashing and manual backwashing. The stainless steel sieve tube is adopted for upper water distribution, so that filter materials are prevented from losing during backwashing. In order to prevent the screen pipe from being blocked by the oil dirt accumulated in the tank, a discharge port is additionally arranged on the tank body in the company, so that the dirt is directly discharged without passing through the screen pipe before the backwash flow starts, and the screen pipe is prevented from being blocked. The oily sewage enters the water distribution system from the upper part of the device, uniformly distributed water passes through the filtering layer, suspended matters and oil in the water are intercepted, and the filtered water is discharged from the bottom of the device through the water collection system.
The quartz sand adopts natural high-quality quartz sand ore deposits as raw materials, and is subjected to a series of novel production processes of mechanical crushing, rolling compaction, washing screening, drying screening, vibration grading and the like, so that the natural structure of the quartz stone is effectively protected, and the service cycle (3-4 cycles) of the filter material is prolonged.
The magnetite filter material is suitable for a tubular high-resistance water distribution system. It is usually matched with quartz sand filter material, is a better material mixing procedure at present, has good adaptability to improving supporting layer and water distribution system, and is an indispensable filter material for multilayer filter. The magnetite filter material has the advantage of filtering speed of 30-40 m/h, so that the magnetite filter material is an important filter material product, and is prepared by carefully selecting magnetite with iron content of 40-42%.
As shown in fig. 8, the two-stage filter uses fiber balls 22 as a filter medium, a main pipe 23 is arranged below the fiber balls 22, and gravel 24 is filled below the main pipe 23. The working principle is as follows: in the treatment of oily sewage, the fiber ball 22 filter material has better oil removal capability. When the fiber ball 22 filter material contacts with oily sewage, the filter material contacts with water molecules first, a layer of water protection film is formed on the surface of the fiber ball 22, and the filter material is easily washed by water during back flushing. The novel oil-proof modified fiber ball 22 not only has better effects of removing suspended matters and oil, but also can not leak out, and the filter layer is not hardened. The main performance indexes of the fiber ball 22 filter are as follows: the filtering speed is 15-30m/h, the filtering period is 8-24h, the head loss is 3-10m, the sewage interception amount is 6-20kg/m < 3 >, the design pressure is 0.6MPa, the back flushing adopts mechanical stirring or gas-water back flushing, the water back flushing strength is 10L/s.m2, the gas back flushing strength is 30-45L/s.m2, the back flushing lasts for 10-30min, and the suspended matter and oil removal rate is 82-95%.
The function of the comprehensive dosing module is to prepare, store and provide the concentration of the medicament required by the system for the processing system. Mainly comprises a gel breaker dosing system, a coagulant dosing system, an oil remover dosing system and an acid and alkali dosing system.
The ultrafiltration processing system module comprises: ultrafiltration is a technique for removing impurities from liquids by mechanical sieving, which has an efficient and stable entrapment effect on suspended matter, colloids, bacteria and microorganisms. Ultrafiltration is a fluid tangential flow and pressure driven filtration process and separates particles by molecular weight. The pore size of the ultrafiltration membrane is approximately in the range of 0.002-0.1 microns. The dissolved substances and substances smaller than the pore size of the membrane will be able to permeate the membrane as permeate, and the substances that cannot permeate the membrane will be slowly concentrated in the effluent. The produced water (permeate) will thus contain water, ions and small molecular weight substances, while colloidal substances, particles, bacteria, viruses and protozoa will be removed by the membranes. The rejection rate of the ultrafiltration membrane treatment system to escherichia coli is 99.99%, the rejection rate of SS is 55% -99.99%, and the rejection rate of CODcr is 20% -60% (considering molecular weight).
The ultrafiltration device has the advantages of high automation degree and small occupied area. The device adopts PLC control, and an operator can set an operation period, a filtering time, an air scrubbing time, a water backwashing time, a forward flushing time and the like, and the set device can realize a full-automatic continuous operation mode of timing filtering and backwashing.
As shown in fig. 9, the boost refill module: the wellhead automatic pressurizing device is a set of device developed mainly aiming at the actual requirement of small-area oilfield oil extraction injection water. The device mainly comprises a booster pump, a filter, an inlet and outlet pipeline valve, a frequency converter pressure transmitter, a flowmeter, an automatic control system, a power supply system and a movable pump house. The booster pump has the functions of pressure overrun protection, overload protection and the like. Can be continuously injected under the unattended condition. The device integrates pump house design and process installation design, and has the characteristics of compact structure, flexible and convenient movement, small occupied area and the like. Particularly, the water injection of the oil field remote mine is omitted, and the investment of water delivery of a long-distance high-pressure pipeline is omitted. But also ensures the injection pressure. The loss of water supply for long-distance pipelines is also reduced, which is practically equal to the saving of a large amount of electric energy. Meanwhile, in a water injection system with too high partial water injection well pressure, the device is adopted to implement a regional pressurization process, so that the pressure difference of the whole system is reduced, and the system efficiency is improved.
The method for treating the produced liquid by using the single well produced liquid reinjection skid-mounted device comprises the following steps of:
a: the produced liquid enters a cyclone separation module, and primary oil and water separation is carried out on the produced liquid in the cyclone separation module;
b: the oily sewage separated from the cyclone separation module enters an electrochemical treatment module, and pollutants are degraded through anode reaction in the electrochemical treatment module;
c: the effluent after degradation by the electrochemical module continuously enters an air floatation treatment module, and in the air floatation treatment module, the two-stage air floatation treatment of air floatation deslagging and air floatation degreasing is carried out, so that the effluent oil content and suspended matters are less than 50mg/L finally;
d: the effluent treated by the air floatation treatment module enters a double-filter material filtering module, and suspended matters and oil are further removed through the double-filter material filtering module, wherein the removal rate of the suspended matters and the oil is 82-95%;
e: the effluent treated by the double-filter material filtering module enters an ultrafiltration treatment system module, and suspended matters, colloid, bacteria and microorganisms are intercepted in the ultrafiltration treatment system module to reach the reinjection standard;
f: and the water reaching the standard is reinjected into the oil layer through the pressurizing reinjection module.
In summary, the invention simultaneously comprises a cyclone separation module, an electrochemical treatment module, an air flotation treatment module, a double-filter material filtering module, a comprehensive dosing module, an ultrafiltration treatment system module and a pressurizing reinjection module, and the reinjection qualification rate is large after the produced liquid is treated by the modules in sequence. The invention takes the connectivity, consistency and rationality of the process steps into consideration, so that the treatment level of the domestic oil well produced liquid is improved by a new step.
Claims (5)
1. The utility model provides a single well produced liquid reinjection sled dress device which characterized in that: the device comprises a cyclone separation module, an electrochemical treatment module, an air floatation treatment module, a double-filter-material filtering module, an ultrafiltration treatment system module and a pressurizing reinjection module which are sequentially connected, and also comprises a comprehensive dosing module;
a cyclonic separating module; the device comprises a separating cylinder (1), wherein a spiral coil (2) is arranged in the separating cylinder (1), the inlet end of the spiral coil (2) is positioned at the center of the coil, the outlet of the spiral coil (2) is positioned at the outer edge of the coil, a shunt tube (3) is arranged at the outlet of the spiral coil (2), the outlet of the spiral coil (2) stretches into the shunt tube (3), an upright shunt plate A (4) is arranged in the shunt tube (3), the shunt plate A (4) is abutted against the outlet of the spiral coil (2) to shunt oil and water discharged from the spiral coil (2), the other end of the shunt tube (3) is connected with an upright liquid separating tube (6), an upright shunt plate B (5) is also arranged in the liquid separating tube (6), the lower end of the liquid separating tube (6) is provided with a separating groove (7), a partition plate (8) is partially arranged in the separating groove (7), the lower end of the liquid separating tube (6) is divided into two outlets, the two outlets are respectively positioned at the outlet sides of the partition plate A (8), the upright side surfaces of the partition plate A (6) are partially connected with a bolt (9) through a bolt (9), and the liquid separating tube (6) can be fixed by a bolt (9) and the bolt (9) is fixedly arranged on the side surfaces of the partition plate;
an air floatation treatment module; the device comprises an air floatation tank (10), a stirring assembly, a dissolved air assembly and a slag scraping assembly, wherein the air floatation tank (10) comprises a coagulation stirring area (11) and a dissolved air release area (12), the stirring assembly is positioned in the coagulation stirring area (11), a liquid flow of the coagulation stirring area (11) flows to the dissolved air release area (12), the dissolved air assembly comprises an anti-blocking releaser (13), the anti-blocking releaser (13) is uniformly arranged at the lower part of the dissolved air release area (12), and the slag scraping assembly is arranged at the upper part of the dissolved air release area (12); the stirring assembly comprises a stirring shaft (16) and stirring blades (17), wherein a centrifuge tube (19) is inserted into the stirring blades (17), an annular space is reserved between the centrifuge tube (19) and the stirring blades (17), the center of the stirring shaft (16) is of a hollow structure, one end of the centrifuge tube (19) is fixedly connected and communicated with the stirring shaft (16), a stirring blade (17) corresponding to the other end of the centrifuge tube (19) is fixedly connected with an inclined striking plate (18), a solid collecting groove (20) is arranged below the striking plate (18), the solid collecting groove (20) is fixedly connected with the stirring blades (17), a solid collecting pipe (21) is sleeved outside the stirring shaft (16), an annular space is reserved between the stirring shaft (16) and the solid collecting pipe (21), the solid collecting groove (20) is communicated with the solid collecting pipe (21), the lower end of the stirring shaft (16) extends out of the solid collecting pipe (21), and a solid separator storage space (14) and a water inlet space (15) are sequentially arranged below a coagulation stirring area (11) of the air floatation tank (10).
The shunt tube (3) is a horizontal inclined downward inclined tube, and one downward inclined end is fixedly connected with the liquid separating tube (6).
2. The single well produced fluid reinjection skid-mounted device of claim 1, wherein: the inclined horizontal inclination angle of the striking plate (18) is 45 degrees.
3. A method of treating produced fluids using a single well produced fluid reinjection skid as set forth in any one of claims 1-2, comprising the steps of:
a: the produced liquid enters a cyclone separation module, and primary oil and water separation is carried out on the produced liquid in the cyclone separation module;
b: the oily sewage separated from the cyclone separation module enters an electrochemical treatment module, and pollutants are degraded through anode reaction in the electrochemical treatment module;
c: the effluent after degradation by the electrochemical module continuously enters an air floatation treatment module, and in the air floatation treatment module, the two-stage air floatation treatment of air floatation deslagging and air floatation degreasing is carried out, so that the effluent oil content and suspended matters are less than 50mg/L finally;
d: the effluent treated by the air floatation treatment module enters a double-filter material filtering module, and suspended matters and oil are further removed through the double-filter material filtering module, wherein the removal rate of the suspended matters and the oil is 82-95%;
e: the effluent treated by the double-filter material filtering module enters an ultrafiltration treatment system module, and suspended matters, colloid, bacteria and microorganisms are intercepted in the ultrafiltration treatment system module to reach the reinjection standard;
f: and the water reaching the standard is reinjected into the oil layer through the pressurizing reinjection module.
4. The production fluid treatment method according to claim 3, wherein: part of the water discharged from the air floatation treatment module is recycled after dissolved air by a multiphase flow dissolved air pump.
5. The production fluid treatment method according to claim 4, wherein: the double-filter-material filtering module adopts two-stage filtering, the primary filter adopts quartz sand and magnetite as filtering media, and the secondary filter adopts fiber balls (22) as filtering media.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104925990A (en) * | 2015-06-03 | 2015-09-23 | 天津市振津石油天然气工程有限公司 | Skid-mounted device for circulating treatment of oil field well flushing flowback fluid and circulating treatment method for oil field well flushing flowback fluid |
| US9199251B1 (en) * | 2013-11-26 | 2015-12-01 | Kbk Industries, Llc | Desanding, flow splitting, degassing vessel |
| WO2018014096A1 (en) * | 2016-07-20 | 2018-01-25 | Petróleo Brasileiro S.A. - Petrobras | Hybrid system and method for treating produced water and sea water to be re-injected into a subsea oil reservoir |
| WO2022105698A1 (en) * | 2020-11-17 | 2022-05-27 | 华东理工大学 | Processing system and method for offshore gas field complex production fluid |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9199251B1 (en) * | 2013-11-26 | 2015-12-01 | Kbk Industries, Llc | Desanding, flow splitting, degassing vessel |
| CN104925990A (en) * | 2015-06-03 | 2015-09-23 | 天津市振津石油天然气工程有限公司 | Skid-mounted device for circulating treatment of oil field well flushing flowback fluid and circulating treatment method for oil field well flushing flowback fluid |
| WO2018014096A1 (en) * | 2016-07-20 | 2018-01-25 | Petróleo Brasileiro S.A. - Petrobras | Hybrid system and method for treating produced water and sea water to be re-injected into a subsea oil reservoir |
| WO2022105698A1 (en) * | 2020-11-17 | 2022-05-27 | 华东理工大学 | Processing system and method for offshore gas field complex production fluid |
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