CN102807291B - Treatment method and equipment for oilfield produced water - Google Patents
Treatment method and equipment for oilfield produced water Download PDFInfo
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- CN102807291B CN102807291B CN201110148147.1A CN201110148147A CN102807291B CN 102807291 B CN102807291 B CN 102807291B CN 201110148147 A CN201110148147 A CN 201110148147A CN 102807291 B CN102807291 B CN 102807291B
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Abstract
The invention relates to a treatment process of oilfield produced water. The treatment process using two-stage oil-water hydrocyclone separation with backflow as a main part is adopted. The treatment process comprises the steps as follows: firstly, adding a demulsifier to perform demulsification pretreatment; next, carrying out two-stage oil-water hydrocyclone separation; and finally carrying out a deep treatment by combination of air floatation and fiber filtration. After the treatment process provided by the invention is carried out, oil in the oilfield produced water can be recycled, and the produced water meets the Recommended Standard of Water Quality of Hidden Water Injection of Clastic Rocks (SY/T5329-1994) and can be used for water injection in oilfields. The treatment process provided by the invention not only reduces the influence of the oilfield produced water on environment, but also recycles resources.
Description
Technical field
The present invention relates to a kind of oil-containing water treatment process, specifically relate to a kind for the treatment of process of oil field extracted water.
Background technology
Along with the development of petrochemical industry, the quantity discharged of oily(waste)water grows with each passing day.Oil field as most of in China in the recovery process of oil has entered the middle and later periods of oil production, and the water ratio of extraction crude oil has exceeded 80%, and some oil fields, even up to 90%, cause a large amount of oily(waste)waters to produce.These oily(waste)waters may cause environmental pollution, are even detrimental to health.Therefore be necessary it to process.
Oily(waste)water has high viscosity, complicated component, strong emulsifying stability and reluctant feature.Oily(waste)water not only contains a large amount of oil and suspended particulate, also have other pollution substances such as a large amount of tensio-active agents, tensio-active agent changes the hydrophobic performance on oil droplet surface and has reduced the interfacial tension between profit, makes suspended substance in water, oil and other various pollutents further disperse, stablize.One adopts oil removal, dosing, breakdown of emulsion, coagulation, precipitation (or air supporting), filters and oxidation by force at present, be aided with again the treatment process such as scale inhibition, inhibition, sterilization or film processing and process oily(waste)water, the method complex process, oil recovery rate is low, easily stops up, sludge quantity is large, labour intensity is large, poor stability, and medicament expense is with high, easily there is film and pollute, have secondary pollution problems.
Summary of the invention
The object of the invention is to the deficiency existing for existing oily water treatment technology, a kind for the treatment of facility for oil field extracted water and treatment process are provided.Treatment facility compactness of the present invention, floor space is little, and treatment process technique is simple, and oil-water separation is good.
For realizing above-mentioned purpose of the present invention, one aspect of the present invention provides a kind of oil conte, sewage treatment device, comprise be linked in sequence as lower device:
Breakdown of emulsion treatment unit, utilizes emulsion splitter to make the oil in water emulsion breakdown of emulsion in oil field extracted water, realizes oil phase and aqueous phase separation;
Cyclone separation device, carries out eddy flow processing to oil field extracted water, makes oily water separation wherein;
Air-floating apparatus, by pass into pressure air-dissolving water in oil field extracted water, makes the microbubble forming after pressure air-dissolving water relief pressure contact with the oil in oil field extracted water, so that wipe oil;
Filtration unit: oil field extracted water is filtered.
Wherein, described breakdown of emulsion treatment unit, comprises breakdown of emulsion reaction tank and the emulsion splitter tank to breakdown of emulsion reaction tank supply emulsion splitter;
Described cyclone separation device, comprises secondary cyclone separator;
Described air-floating apparatus, has air flotation pool and is placed in the dissolved air release in air flotation pool;
Described filtration unit, is fiber ball filter, is provided with the fibrous nodules that profit is filtered in it.
Particularly, described breakdown of emulsion treatment unit also comprises raw waste water equalizing tank, for storing oil field extracted water, and removes silt and the oil slick in oil field extracted water.
Owing to containing a large amount of suspended solids and part oil slick in oil field extracted water, before oil field extracted water enters breakdown of emulsion treatment unit, equalizing tank is set, can play evenly and shock absorption oil field extracted water on the one hand, also can tentatively remove on the other hand silt and the part oil slick in sewage, improve the processing efficiency of follow-up unit.
Wherein, the oil field extracted water after described equalizing tank is standing mixes with the emulsion splitter in emulsion splitter tank by pipeline in breakdown of emulsion reaction tank, carries out breakdown of emulsion reaction.
Particularly, in described secondary cyclone separator, wherein first step cyclone separator comprises:
Profit is carried out to the cyclone pipe of centrifugation;
The oil spill pipe of discharging the greasy dirt after centrifugation, oil spill pipe is arranged on cyclone pipe top, communicates with cyclone pipe;
And the underflow pipe of the current of discharge after centrifugation, underflow pipe is connected with cyclone pipe bottom;
Wherein, second stage cyclone separator comprises:
Profit is carried out to the cyclone pipe of centrifugation;
The oil spill pipe of discharging the greasy dirt after centrifugation, oil spill pipe is arranged on cyclone pipe top, communicates with cyclone pipe;
And the underflow pipe of the current of discharge after centrifugation, underflow pipe is connected with cyclone pipe bottom, wherein, in the inside of underflow pipe, the return line coaxial with underflow pipe is set, and the diameter of return line is less than the diameter of the underflow mouth of pipe.
Wherein, described cyclone pipe comprises cylindrical tube, the conical tube be linked in sequence from top to bottom integral and internal communication.
Particularly, described cylindrical tube is cylindrical; The inner chamber of described conical tube becomes inverted truncated cone-shaped; Described underflow pipe is cylindrical.
Wherein, described oil spill pipe is have inner chamber cylindric; The central shaft of described cylindrical tube, conical tube and oil spill pipe is coaxial.The inside of cylindrical tube and conical tube forms a coaxial official jargon of carrying out the connection of centrifugal, sedimentation processing for oil-containing water stream.
Particularly, on the sidewall of described cylindrical tube, offer water inlet pipe, introduce the current to be separated with certain hydraulic pressure.
Particularly, described conical tube is by order large conical tube that be connected and internal communication and roundlet Taper Pipe form from top to bottom.
Wherein, the ratio of the area of the cross section of described return line and the cross-sectional area of underflow pipe is 5-10: 100.
Particularly, the mouth of pipe of described return line stretches out the bottom of the underflow pipe of second stage cyclone separator.
Particularly, to be positioned at the ratio of the height of underflow pipe and the height of underflow pipe be 2-3 to return line: 10.
Particularly, from the water flowing out between underflow pipe and return line, enter described air-floating apparatus and carry out air supporting removal of impurities processing, and be back in described breakdown of emulsion reaction tank and carry out breakdown of emulsion processing from the water flowing out in return line.
Particularly, described dissolved air release is positioned at bottom or the middle part of the air flotation pool of described air-floating apparatus.
Wherein, described air-floating apparatus also comprises that bubble generator has to the bubble generator of dissolved air release supply pressure dissolved air water:
Force (forcing) pump, pressurizes to the tap water of supply;
Dissolving, the tap water of storage force (forcing) pump pumping, mineralization pressure holds carbonated drink;
Water sprayer adds gas in the tap water of inflow force (forcing) pump.
Particularly, described water sprayer, force (forcing) pump and dissolving are linked in sequence by pipeline; Described water sprayer is arranged on the water absorption tube of force (forcing) pump, to entering in the tap water of force (forcing) pump, adds gas.
The present invention provides a kind of method of processing oil field extracted water on the other hand, comprises oil field extracted water is carried out to breakdown of emulsion processing, oil-water cyclone separating treatment, air supporting processing and filtration treatment successively.
Wherein, described breakdown of emulsion processing is to add emulsion splitter in oil field extracted water, and stirring reaction 15-30min makes the oil in water emulsion breakdown of emulsion in recovered water.
Particularly, described emulsion splitter selective polymerization aluminum chloride.
Wherein, the consumption of described emulsion splitter is in every 1 liter of oil field extracted water, to add emulsion splitter described in 50-150mg.
Wherein, described oil-water cyclone separating treatment comprises at least secondary, and wherein one-level cyclonic separation is processed and adopted as lower separation device:
Profit is carried out to the cyclone pipe of centrifugation;
The oil spill pipe of discharging the greasy dirt after centrifugation, oil spill pipe is arranged on cyclone pipe inside, communicates and extend to its top along short transverse with cyclone pipe;
And the underflow pipe of the current of discharge after centrifugation, underflow pipe is connected with cyclone pipe bottom, wherein, in the inside of underflow pipe, the return line coaxial with underflow pipe is set, and the diameter of return line is less than the diameter of the underflow mouth of pipe.
Particularly, the ratio of the area of the cross section of described return line and the cross-sectional area of underflow pipe is 5-10: 100.
Particularly, the mouth of pipe of described return line stretches out the bottom of the underflow pipe of second stage cyclone separator.
Particularly, to be positioned at the ratio of the height of underflow pipe and the height of underflow pipe be 2-3 to return line: 10.
Particularly, from the water flowing out between underflow pipe and return line, enter described air-floating apparatus and carry out air supporting removal of impurities processing, and be back in described breakdown of emulsion reaction tank and carry out breakdown of emulsion processing from the water flowing out in return line.
Wherein, from the flow of current that flows out in return line and the ratio of the total flux of underflow pipe, be 5%-10% (being that reflux ratio is 5%-10%).
Particularly, the intake pressure of the cyclonic separation processing of described wherein one-level is 150kPa-600kPa, and splitting ratio is 5%-10%, and the intake pressure of the cyclonic separation processing of another grade is 150kPa-500kPa, and splitting ratio is 2%-5%.
Particularly, the intake pressure of first step cyclonic separation processing is 150kPa-600kPa, and splitting ratio is 5%-10%; The intake pressure of second stage cyclonic separation processing is 150kPa-500kPa, and splitting ratio is 2%-5%.
Especially, the intake pressure of cyclonic separation processing is for the first time 400kPa-600kPa, more preferably 450kPa-500kPa; The intake pressure of described cyclonic separation for the second time processing is 300kPa-500kPa, more preferably 350kPa-400kPa.
Particularly, the ratio of the flow of water liquid in the return line of second stage cyclone separator and the total flux of underflow pipe is 5%-10% (being that reflux ratio is 5%-10%).
Particularly, in the cyclone separator that carries out second stage cyclonic separation processing, adopt as lower separation device:
Profit is carried out to the cyclone pipe of centrifugation;
The oil spill pipe of discharging the greasy dirt after centrifugation, oil spill pipe is arranged on cyclone pipe inside, communicates and extend to its top along short transverse with cyclone pipe;
And the underflow pipe of the current of discharge after centrifugation, underflow pipe is connected with cyclone pipe bottom, wherein, in the inside of underflow pipe, the return line coaxial with underflow pipe is set, and the diameter of return line is less than the diameter of the underflow mouth of pipe.
Wherein, in air supporting treating processes, the operating pressure of bubble generator is 0.3MPa-0.4MPa, and hydraulic detention time is 20-30min.
Particularly, the recirculation water in air supporting removal of impurities process is 6-30 with the ratio of the flow of former water: 100, be preferably 25: 100.
Wherein, described filtration treatment adopts polyster fibre ball to filter.
Particularly, the flow velocity of described filtration treatment is 30m/h-40m/h.
Sewage disposal device of the present invention and treatment process tool have the following advantages:
1, oilfield sewage of the present invention adopts breakdown of emulsion processing, the processing of secondary cyclonic separation, air supporting processing and filtration treatment successively, sewage treatment process is simple, treatment facility compact construction, occupation area of equipment is little, and treatment facility of the present invention and treatment process are particularly useful for the de-oiling processing of oil field extracted water and oil-contaminated water of oil field.
2, sewage of the present invention is in the hydrocyclone of cyclonic separation processing for the second time treating processes, and part is back to breakdown of emulsion pond through the water of cyclonic separation processing from return line and processes, has improved oily water separation treatment effect, and oil removal rate reaches 99.8%.
3, sewage disposal device of the present invention has return line at cyclone separator, can will again reflux through the cyclonic separation water that contains greasy dirt after treatment, process again, reduced the load of follow-up air supporting knot screen, filtration unit, improved the processing efficiency of sewage disposal device.
4, the oil in the oil field extracted water of the inventive method processing is recycled, water outlet can be back to oil-field flooding, reaches < < petroclastic rock and hides injection water quality proposed standard > > (SY/T5329-1994) standard.The impact of oil field extracted water on environment can not only be effectively reduced, the recycling of resource can also be realized.
Accompanying drawing explanation
Fig. 1 is water treating equipment connection diagram of the present invention;
Fig. 2 is first step cyclone separator schematic diagram in the embodiment of the present invention 1;
Fig. 3 is cyclone separator schematic diagram in the second stage in the embodiment of the present invention 1;
Fig. 4 is first step cyclone separator schematic diagram in the embodiment of the present invention 2;
Fig. 5 is cyclone separator schematic diagram in the second stage in the embodiment of the present invention 2.
Description of reference numerals:
1. raw waste water equalizing tank; 11. water pumps; 12. under meters; 2. emulsion splitter tank; 3. breakdown of emulsion reaction tank; 4. first step cyclone separator; 5. second stage cyclone separator; 40,50. cyclone pipes; 401,501. water inlet pipes; 402,502. cylindrical tube; 403,503. large conical tubes; 404,504. roundlet Taper Pipes; 405,405 ', 505,505 '. conical tube; 41,51. oil spill pipes; 42,52. underflow pipes; 421, the 521. underflow mouths of pipe; 6. air flotation pool; 61. dissolved air releases; 62. dissolved air water bubble generators; 63. force (forcing) pumps; 64. dissolvings; 65. water sprayers; 7. fiber ball filter; 1A. breakdown of emulsion treatment unit; 4A. cyclone separation device.
Embodiment
Describe with reference to the accompanying drawings the equipment of oil-containing sewage treatment technique process of the present invention and use thereof in detail.
As shown in Fig. 1,2,3,4,5, equipment for treating water extracted from oil field comprises breakdown of emulsion treatment unit 1A, the cyclone separation device 4A, air flotation pool 6 and the fiber ball filter 7 that by pipeline, connect in turn, in addition, also comprise oil reservoir and mummifying pool, wherein, oil reservoir is for collecting oil slick and the isolated oil of cyclone separation device of sewage equalizing tank; Mummifying pool dewaters and concentrates for the greasy filth that sewage treatment process is produced, and makes its minimizing.
Breaking device 1A comprises the raw waste water equalizing tank 1, emulsion splitter tank 2 and the breakdown of emulsion reaction tank 3 that by pipeline, connect.
First the oil field extracted water that contains silt and oil slick carries out standing in raw waste water equalizing tank 1, after removing silt and part oil slick, by water pump 11 and under meter 12, inject in breakdown of emulsion reaction tank 3, in breakdown of emulsion reaction tank 3, carry out mixing fully and breakdown of emulsion reaction with the emulsion splitter coming from emulsion splitter tank 2, make oil in water emulsion breakdown of emulsion, oil phase and aqueous phase separation in oil field extracted water.
Oil field extracted water is standing in equalizing tank 1, can play evenly and shock absorption oil field extracted water on the one hand, also can tentatively remove on the other hand silt and the part oil slick in sewage, improves the processing efficiency of follow-up unit.
Wherein, the consumption of emulsion splitter is to add 50-150mg emulsion splitter in every 1 liter of oil field extracted water.
The emulsion splitter adding in the present invention is selected polymerize aluminum chloride.
Cyclone separation device 4A comprises the first step cyclone separator 4 and the second stage cyclone separator 5 that connect successively, and the underflow pipe 42 of first step cyclone separator 4 is connected with the water inlet pipe 501 of second stage cyclone separator 5 by pipeline.Oil field extracted water is carried out to 2 cyclonic separation processing, profit is wherein separated under centrifugal action.
Wherein, first step cyclone separator 4 comprises the underflow pipe 42 that profit is carried out to the cyclone pipe 40 of centrifugation, the oil spill pipe 41 of discharging the greasy dirt after centrifugation and the current of discharge after centrifugation.
The water being flowed out by underflow pipe 42 enters second stage cyclone separator 5 by the water-in 501 of second stage cyclone separator 5, carries out cyclonic separation for the second time in second stage cyclone separator 5.
Second stage cyclone separator 5 comprises the underflow pipe 52 that profit is carried out to the cyclone pipe 50 of centrifugation, the oil spill pipe 51 of discharging the greasy dirt after centrifugation and the current of discharge after centrifugation.
The area of the cross section of return line 53 is 5-10 with the ratio of the cross-sectional area of underflow pipe 52: 100, and the mouth of pipe of return line 53 stretches out the bottom of the underflow pipe 52 of second stage cyclone separator 5, from the water flowing out between underflow pipe 52 and return line 53, enter air-floating apparatus and carry out air supporting removal of impurities processing, and be back in breakdown of emulsion reaction tank 3 from the water of return line 53 interior outflows, carry out breakdown of emulsion processing, return line 53 internal reflux to the current of breakdown of emulsion reaction tank 3 are 5-10 with the ratio of the interior water flow of underflow pipe 52: 100.
The ratio that return line 53 is positioned at the height of underflow pipe 52 and the height of underflow pipe 52 is 2-3: 10.
Oil field extracted water is high speed rotating in cyclone separator, produces high speed rotating flow field, wherein, the higher water of density is under the effect of rotational flow field, along cyclone separator axially and radially move downwards and outwards, so just formed outer swirling flow field, while arriving underflow pipe bottom, discharge; The oil that density is less upwards and inwardly moves to central axial direction, and at central axis, forms the interior vortex moving upward, and while arriving oil spill pipe outlet when moving upward, discharges, and has so just reached the object that profit two is separated.
Oil field extracted water through breakdown of emulsion processing enters in first step cyclone separator by the water-in 401 of first step cyclone separator 4 after water pump 11 pressurizations, carry out cyclonic separation processing for the first time, the oil that density is little flows out from the oil spill pipe 41 of first step cyclone separator 4 top center, the oily(waste)water that density is higher flows out from the underflow pipe 42 of its bottom, wherein, the water-in water flow pressure of first step cyclone separator 4 is 150kPa-600kPa; Splitting ratio is 5%-10%;
The water flowing out from first step cyclone separator 4 underflow pipes 42 flows in second stage cyclone separator 5 by pipeline, carry out cyclonic separation processing for the second time, the oil that density is little flows out from the oil spill pipe 51 of second stage cyclone separator 5 top center, water between underflow pipe 52 and return line 53 that density is higher enters air-floating apparatus and carries out air supporting removal of impurities processing, and be back to and in breakdown of emulsion reaction tank 3, carry out breakdown of emulsion processing from the water of return line 53 interior outflows, wherein, water-in 501 water flow pressure of second stage cyclone separator 5 are 150kPa-500kPa; Splitting ratio is 2%-5%; The flow that is back to the current that carry out breakdown of emulsion processing in breakdown of emulsion reaction tank 3 from the water of return line 53 interior outflows is 5%-10% with the ratio of the interior total flux of underflow pipe 52, and reflux ratio is 5%-10%.
In the present invention, first step cyclone separator is removed the macrobead oil droplet in oil field extracted water; Second stage swirler is removed the small-particle oil droplet in oil field extracted water, simultaneously due to a built-in coaxial return line in underflow pipe exit, make the current that contain oil droplet of underflow pipe centre portions be partly refluxed to breakdown of emulsion treatment unit, again carry out breakdown of emulsion processing, reduce the water outlet of eddy flow system by concentration.
From the oil of oil spill pipe 41, the 51 interior outflows of two-stage cyclone separator, send into oil reservoir, carry out oil recovery and utilization.
Dissolved air release 61 at the bottom of air-floating apparatus has air flotation pool 6 and is arranged on pond.Pressure air-dissolving water enters reliever 61 by the road, and relief pressure produces microbubble and the outgas water that a large amount of diameters is 1 μ m left and right.
The pressure air-dissolving water that flows into air flotation pool 6 is prepared generation by pressure air-dissolving water vapor bubbles producer 62.Pressure air-dissolving water vapor bubbles producer 62 is connected with reliever 61 by pipeline, and it comprises the force (forcing) pump 63, dissolving 64 and the water sprayer 65 that by pipeline, are linked in sequence;
Water in dissolving 64 circulates between pump and dissolving by force (forcing) pump 63, meanwhile, the water sprayer 65 being arranged on water pump suction pipe is inflated the water in container tank 64 by the air-breathing mode of jet, mineralization pressure dissolved air water, the pressure of the pressure air-dissolving water of preparing in the present invention is 0.3MPa-0.4MPa.
When entering from a side of air flotation pool 6 through the current of cyclonic separation processing, flow in the process of opposite side of air flotation pool 6, a large amount of microbubbles that greasy dirt in current discharges with dissolved air release in air flotation pool 61 contact, and and bubble adhesion, form the air float body that density is less than water, under the effect of buoyancy, float up to the water surface, form scum silica frost, thereby removed the greasy dirt in water.In air flotation pool, hydraulic detention time is 20-30min.
Filtration unit is fiber ball filter 7, and oil removal by air bubbling water is carried out to fiber filter, and wherein, the filtering material of strainer adopts polyster fibre, and the diameter of fibrous nodules is 32mm-35mm.
The fiber filtering of the polyster fibre ball in the present invention has huge surface-area and good adsorptive power, thereby the micro-oil content that the further Adsorption air supporting of the effects such as the interception by filamentary material, filtration, absorption is processed in water outlet has guaranteed that effluent quality meets < < petroclastic rock and hides injection water quality proposed standard > > (SY/T5329-1994) water quality standard.)
Filtration flow-rate 30m/h-40m/h in filter process of the present invention.When reaching 1.4m-1.8m, gross head loss finishes filtration when above.
Clean and adopt mechanical stirring to add hydraulic reverse backwashing manner cleaning and filtrating equipment, mixing speed is 15r/min-25r/min, and back washing strength is 8L/m
2.s-12L/m
2.s.
Describe with reference to the accompanying drawings the technological process of the oil field produced water treatment of the present invention in detail.
Embodiment 1
According to flow process as shown in Figure 1, carrying out the recovered water in oil field processes.The oleaginousness of oil field extracted water is 2300mg/L.
1) breakdown of emulsion processing
Oil field extracted water is inputted to raw waste water equalizing tank 1, and recovered water is interior standing at equalizing tank 1, tentatively removes silt and part oil slick in sewage, then the water outlet of equalizing tank is inputted to breakdown of emulsion reaction tank 3 by under meter 12;
Emulsion splitter polymerize aluminum chloride is from the interior outflow of emulsion splitter tank 2, by under meter 12, send in breakdown of emulsion reaction tank 3, mix with oil field extracted water, carry out breakdown of emulsion reaction, oil in water emulsion breakdown of emulsion in sewage, is separated from each other oil phase, water in recovered water to obtain breakdown of emulsion to process water, wherein, the amount of the emulsion splitter polymerize aluminum chloride adding is 150mg/L oil field extracted water, and the breakdown of emulsion reaction times is 15min.
2) cyclonic separation processing
Breakdown of emulsion is processed to water to be sent in first step cyclone separator 4 (as Fig. 2) and carries out cyclonic separation processing for the first time through pressure pump 11, first step cyclone separator 4 comprises water inlet pipe 401, cyclone pipe 40, oil spill pipe 41 and underflow pipe 42, wherein, cyclone pipe 40 has the cylindrical tube 402 of be linked in sequence from top to bottom integral and internal communication, large conical tube 403 and roundlet Taper Pipe 404, wherein, large conical tube 403 and roundlet Taper Pipe 404 are inverted truncated cone-shaped, the diameter of its upper surface is greater than the diameter of lower surface, the lower surface diameter of large conical tube 403 is identical with roundlet Taper Pipe 404 upper surface diameters.
From the underflow pipe 42 of first step cyclone separator 4, flowing out oily(waste)water that density is higher enters in second stage cyclone separator 5 (as Fig. 3) and carries out cyclonic separation processing for the second time, second stage cyclone separator 5 comprises water inlet pipe 501, cyclone pipe 50, oil spill pipe 51 and underflow pipe 52, wherein, cyclone pipe 50 has the cylindrical tube 502 of be linked in sequence from top to bottom integral and internal communication, large conical tube 503 and roundlet Taper Pipe 504.Wherein, oil spill pipe 51 is placed in cylindrical tube 502, communicates and along short transverse, stretch out the top of cylindrical tube 502 with cylindrical tube 502, water inlet pipe 501 is opened on the sidewall of cylindrical tube 502, cylindrical underflow pipe 52 is connected with the bottom of roundlet Taper Pipe 504, and the inside at underflow pipe 52 arranges the return line 53 coaxial with underflow pipe, the diameter of return line 53 is less than the diameter of underflow pipe 52, the area of the cross section of return line 53 is 10: 100 with the ratio of the cross-sectional area of underflow pipe 52, and the mouth of pipe of return line 53 stretches out the bottom of the underflow pipe 52 of second stage cyclone separator 5, the ratio that return line 53 is positioned at the height of underflow pipe 52 and the height of underflow pipe 52 is 2: 10, from the water flowing out between underflow pipe 52 and return line 53, enter air-floating apparatus and carry out air supporting removal of impurities processing, and be back to and in breakdown of emulsion reaction tank 3, carry out breakdown of emulsion processing from the water of return line 53 interior outflows.
After cyclonic separation is processed, the oil that density is little flows out from the oil spill pipe 51 of second stage cyclone separator 5 top center, the cyclonic separation processing water from flowing out between underflow pipe 52 and return line 53 that density is higher enters air-floating apparatus and carries out air supporting removal of impurities processing, and be back to and in breakdown of emulsion reaction tank 3, carry out breakdown of emulsion processing from the water of return line 53 interior outflows, wherein, the water-in water flow pressure of control second stage cyclone separator 5 is 350kPa; Splitting ratio is 5%; The flow that is back to the current that carry out breakdown of emulsion processing in breakdown of emulsion reaction tank 3 from the water of return line 53 interior outflows is 10% with the ratio of the total flux of underflow pipe 52 interior current, and reflux ratio is 10%.
3) air supporting processing
Cyclonic separation is processed to water with 4m
3the flow of/h is from a side inflow of air flotation pool 6, and pressure air-dissolving water is with 1m
3the flow of/h flows to air flotation pool 6 from the bottom of air flotation pool 6, (reflux ratio that is air supporting removal of impurities is 25%, reflux ratio equals the flow of pressure air-dissolving water and the ratio of raw water flow), wherein, the pressure of pressure air-dissolving water is 0.4Mpa, the operating pressure that is bubble generator 62 is 0.4MPa, and it is 20min. that air supporting removes miscellaneous time
Air supporting removal of impurities current flow out from the opposite side of air flotation pool 61.
4) filtration treatment
Air supporting removal of impurities water take the flow velocity of 30m/h by filtering material the fiber ball filter 8 as terylene, wherein, fibrous nodules diameter is 32mm-35mm, and voidage is that the hydromining infrared spectrophotometry after 96.1% filtration detects its oleaginousness, in water, oleaginousness is 4.7mg/L, and oil removal rate is 99.8%.
Through the oleaginousness in the water of fibre-ball filtration, be less than 5mg/L, reach < < petroclastic rock and hide injection water quality proposed standard > > (SY/T5329-1994), can be directly used in oil-field flooding.
Embodiment 2
In breakdown of emulsion treating processes, except the consumption of emulsion splitter polymerize aluminum chloride is 50mg/L oil field extracted water, the breakdown of emulsion reaction times is outside 30min, and all the other are identical with embodiment 1.
In cyclonic separation treating processes, first step cyclone separator 4 (shown in Fig. 4) comprises water inlet pipe 401, cyclone pipe 40, oil spill pipe 41 and underflow pipe 42, wherein, cyclone pipe 40 is by cylindrical tube 402, the conical tube 405 ' form of be linked in sequence from top to bottom integral and internal communication.Wherein, oil spill pipe 41 is placed in cylindrical tube 402, communicates and extend to its top along short transverse with cylindrical tube 402; Water inlet pipe 401 is opened on the sidewall of cylindrical tube 402; Underflow pipe 42 is cylindrical, is connected with the bottom of conical tube 405, derives through cyclonic separation current after treatment.
Second stage cyclone separator 5 (as shown in Figure 5) comprises water inlet pipe 501, cyclone pipe 50, oil spill pipe 51 and underflow pipe 52, and wherein, cyclone pipe 50 is by cylindrical tube 502, the conical tube 505 ' form of be linked in sequence from top to bottom integral and internal communication.Wherein, oil spill pipe 51 is placed in cylindrical tube 502, communicates and extend to its top along short transverse with cylindrical tube 502, water inlet pipe 501 is opened on the sidewall of cylindrical tube 502, cylindrical underflow pipe 52 is connected with the bottom of conical tube 505, and the inside at underflow pipe 52 arranges the return line 53 coaxial with underflow pipe, the diameter of return line 53 is less than the diameter of underflow pipe 52, the area of the cross section of return line 53 is 5: 100 with the ratio of the cross-sectional area of underflow pipe 52, and the mouth of pipe of return line 53 stretches out the bottom of the underflow pipe 52 of second stage cyclone separator 5, the ratio that return line 53 is positioned at the height of underflow pipe 52 and the height of underflow pipe 52 is 3: 10, from the water flowing out between underflow pipe 52 and return line 53, enter air-floating apparatus and carry out air supporting removal of impurities processing, and be back to and in breakdown of emulsion reaction tank 3, carry out breakdown of emulsion processing from the water of return line 53 interior outflows.
After cyclonic separation is processed, the oil that density is little flows out from the oil spill pipe 51 of second stage cyclone separator 5 top center, the cyclonic separation processing water from flowing out between underflow pipe 52 and return line 53 that density is higher enters air-floating apparatus and carries out air supporting removal of impurities processing, and be back to and in breakdown of emulsion reaction tank 3, carry out breakdown of emulsion processing from the water of return line 53 interior outflows, wherein, the water-in water flow pressure of control second stage cyclone separator 5 is 400kPa; Splitting ratio is 2%; The flow that is back to the current that carry out breakdown of emulsion processing in breakdown of emulsion reaction tank 3 from the water of return line 53 interior outflows is 5% with the ratio of the total flux of underflow pipe 52 interior current, and reflux ratio is 5%.
In air supporting treating processes, except the pressure of pressure air-dissolving water is 0.3Mpa, the operating pressure of bubble generator is 0.3MPa, and air supporting is except miscellaneous time is 30min, and all the other are identical with embodiment 1.
In filter process, except flow velocity is 40m/h, all the other are identical with embodiment 1.
Hydromining after filtration treatment detects its oleaginousness by infrared spectrophotometry method, and in water, oleaginousness is 4.8mg/L, and oil removal rate is 99.8%.
Through the oleaginousness in the water of fibre-ball filtration, be less than 5mg/L, reach < < petroclastic rock and hide injection water quality proposed standard > > (SY/T5329-1994), can be directly used in oil-field flooding.
Embodiment 3
Except the intake pressure of first step cyclone separator 4 is 150kPa, the higher oily(waste)water of density flowing out from the underflow pipe 42 of first step cyclone separator 4 enters second stage cyclone separator 5 after the processing of force (forcing) pump, controlling intake pressure is outside 150kPa, all the other are identical with embodiment 1, hydromining after filtration treatment detects its oleaginousness by infrared spectrophotometry method, in water, oleaginousness is 4.9mg/L, and oil removal rate is 99.8%.
Through the oleaginousness in the water of fibre-ball filtration, be less than 5mg/L, reach < < petroclastic rock and hide injection water quality proposed standard > > (SY/T5329-1994), can be directly used in oil-field flooding.
Claims (10)
1. an equipment for treating water extracted from oil field, for oil field extracted water is processed, makes water after treatment be directly used in oil-field flooding, comprise be linked in sequence as lower device:
Breakdown of emulsion treatment unit (1A), utilize emulsion splitter to make the oil in water emulsion breakdown of emulsion in oil field extracted water and realize oil phase and aqueous phase separation, have the emulsion splitter tank (2) that makes oil field extracted water and emulsion splitter carry out well-mixed breakdown of emulsion reaction tank (3) and directly supply emulsion splitter to breakdown of emulsion reaction tank, oil field extracted water injects breakdown of emulsion reaction tank by water pump and under meter;
Cyclone separation device (4A), oil field extracted water is carried out to eddy flow processing, make oily water separation wherein, it has interconnective primary cyclone (4) and secondary cyclone separator (5), wherein primary cyclone is connected with breakdown of emulsion treatment unit so that a cyclonic separation processing is carried out in the inflow of breakdown of emulsion processing water, secondary cyclone separator is connected with air-floating apparatus, breakdown of emulsion treatment unit respectively, makes swirl flow separating treatment water flow into air-floating apparatus and be back to breakdown of emulsion treatment unit;
Air-floating apparatus, by pass into pressure air-dissolving water in oil field extracted water, greasy dirt in the microbubble contact eddy flow oil field extracted water current after treatment that make to form after pressure air-dissolving water relief pressure, so that wipe oil;
Filtration unit, filters oil field extracted water.
2. oil field sewage treating equipment as claimed in claim 1, is characterized in that:
Air-floating apparatus, has air flotation pool (6) and is placed in the dissolved air release (61) in air flotation pool;
Filtration unit, for fiber ball filter (7), is provided with the fibrous nodules that profit is filtered in it.
3. oil field sewage treating equipment as claimed in claim 2, is characterized in that: primary cyclone (4) comprising:
Profit is carried out to the cyclone pipe (40) of centrifugation;
The oil spill pipe (41) of discharging the greasy dirt after centrifugation, oil spill pipe (41) is arranged on cyclone pipe (40) top, communicates with cyclone pipe (40);
And the underflow pipe (42) of the current of discharge after centrifugation, underflow pipe (42) is connected with cyclone pipe (40) bottom;
Secondary cyclone separator (5) comprising:
Profit is carried out to the cyclone pipe (50) of centrifugation;
The oil spill pipe (51) of discharging the greasy dirt after centrifugation, oil spill pipe (51) is arranged on cyclone pipe (50) top, communicates with cyclone pipe (50);
And the underflow pipe (52) of the current of discharge after centrifugation, underflow pipe (52) is connected with cyclone pipe (50) bottom, wherein, inside at underflow pipe (52) arranges the return line (53) coaxial with underflow pipe, and the diameter of return line (53) is less than the diameter of the underflow mouth of pipe (521).
4. oil field sewage treating equipment as claimed in claim 2, is characterized in that air-floating apparatus also comprises that bubble generator (62) has to the bubble generator (62) of dissolved air release (61) supply pressure dissolved air water
Force (forcing) pump (63), pressurizes to the tap water of supply;
Dissolving (64), the tap water of storage force (forcing) pump pumping, mineralization pressure dissolved air water;
Water sprayer (65) adds gas in the tap water of inflow force (forcing) pump.
5. process a method for oil field extracted water, it is characterized in that adopting oil field sewage treating equipment as claimed in claim 1, oil field extracted water is carried out to breakdown of emulsion processing, oil-water cyclone separating treatment, air supporting processing and filtration treatment successively.
6. treatment process as claimed in claim 5, is characterized in that described breakdown of emulsion processing is to add emulsion splitter in oil field extracted water, and stirring reaction 15-30min, makes the oil in water emulsion breakdown of emulsion in recovered water.
7. the treatment process as described in claim 5 or 6, is characterized in that described oil-water cyclone separating treatment comprises firsts and seconds, and secondary cyclonic separation is processed and adopted as lower separation device:
Profit is carried out to the cyclone pipe (50) of centrifugation;
The oil spill pipe (51) of discharging the greasy dirt after centrifugation, oil spill pipe (51) is arranged on cyclone pipe (50) top, communicates with cyclone pipe (50);
And the underflow pipe (52) of the current of discharge after centrifugation, underflow pipe (52) is connected with cyclone pipe (50) bottom, wherein, inside at underflow pipe (52) arranges the return line (53) coaxial with underflow pipe, and the diameter of return line (53) is less than the diameter of the underflow mouth of pipe (521).
8. treatment process as claimed in claim 7, the intake pressure that it is characterized in that the cyclonic separation processing of described one-level is 150kPa-600kPa, splitting ratio is 5%-10%, and the intake pressure of described secondary cyclonic separation processing is 150kPa-500kPa, and splitting ratio is 2%-5%.
9. the treatment process as described in claim 5 or 6, the operating pressure that it is characterized in that bubble generator in air supporting treating processes is 0.3MPa-0.4MPa, hydraulic detention time is 20-30min.
10. the treatment process as described in claim 5 or 6, is characterized in that described filtration treatment adopts polyster fibre ball to filter.
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