CN102807291A - Treatment method and equipment for oilfield produced water - Google Patents
Treatment method and equipment for oilfield produced water Download PDFInfo
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- CN102807291A CN102807291A CN2011101481471A CN201110148147A CN102807291A CN 102807291 A CN102807291 A CN 102807291A CN 2011101481471 A CN2011101481471 A CN 2011101481471A CN 201110148147 A CN201110148147 A CN 201110148147A CN 102807291 A CN102807291 A CN 102807291A
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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 of treatment process of oil field extracted water.
Background technology
Along with the petrochemical complex industrial expansion, the quantity discharged of oily(waste)water grows with each passing day.Got into the middle and later periods of oil production like the most of oil field of China in the recovery process of oil, the water ratio of extraction crude oil surpasses 80%, and the oil field that has even up to 90% causes a large amount of oily(waste)waters to produce.These oily(waste)waters possibly cause environmental pollution, even are detrimental to health.Therefore be necessary it is handled.
Oily(waste)water has HV, complicated component, strong emulsifying stability and reluctant characteristics.Oily(waste)water not only contains a large amount of oil and suspended particulate; Also have a large amount of other pollution substances such as tensio-active agent; The hydrophobic performance that tensio-active agent changes the oil droplet surface has reduced the IT between profit, makes suspended substance in the water, oil and other all contaminations further disperses, stablize.One adopts oil removal, dosing, breakdown of emulsion, coagulation, deposition (or air supporting), filters and strong oxidation at present, is aided with treatment process such as scale inhibition, inhibition, sterilization or film processing again and handles oily(waste)water, this method complex process; The oil recovery rate is low, is prone to stop up, and sludge quantity is big; Labour intensity is big, poor stability, and medicament expense is with high; Film taking place easily pollute, has secondary pollution problems.
Summary of the invention
The objective of the invention is to deficiency, a kind of treatment facility and treatment process that is used for oil field extracted water is provided to the existence of existing oily water treatment technology.Treatment facility of the present invention is compact, and floor space is little, and treatment process technology 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 like lower device:
The breakdown of emulsion treatment unit utilizes emulsion splitter to make the oil in water emulsion breakdown of emulsion in the oil field extracted water, realizes oil phase and aqueous phase separation;
Cyclone separation device carries out eddy flow to oil field extracted water and handles, and makes oily water separation wherein;
Air-floating apparatus contacts with oil in the oil field extracted water through in oil field extracted water, feeding pressure air-dissolving water, make the microbubble that forms behind the pressure air-dissolving water relief pressure, so that the removal greasy dirt;
Filtration unit: oil field extracted water is filtered.
Wherein, said breakdown of emulsion treatment unit comprises the breakdown of emulsion reaction tank and to the emulsion splitter jar of breakdown of emulsion reaction tank supply emulsion splitter;
Said cyclone separation device comprises the secondary cyclone separator;
Said air-floating apparatus has air flotation pool and is placed in the dissolved air release in the air flotation pool;
Said filtration unit is fiber ball filter, is provided with in it profit is carried out filtering fibrous nodules.
Particularly, said breakdown of emulsion treatment unit also comprises the raw waste water equalizing tank, is used to store oil field extracted water, and removes silt and oil slick in the oil field extracted water.
Owing to contain a large amount of suspended solids and part oil slick in the oil field extracted water; Equalizing tank, oil field extracted water is set before getting into the breakdown of emulsion treatment unit; Can play evenly and the buffering effect oil field extracted water on the one hand; Also can tentatively remove silt and part oil slick in the sewage on the other hand, improve follow-up unitary processing efficiency.
Wherein, the oil field extracted water after said equalizing tank leaves standstill mixes in the breakdown of emulsion reaction tank with emulsion splitter in the emulsion splitter jar through pipeline, carries out the breakdown of emulsion reaction.
Particularly, in the said secondary cyclone separator, wherein first step cyclone separator comprises:
Profit is carried out the cyclone pipe of spinning;
Smeary oil spill pipe after the discharge spinning, oil spill pipe is installed in the cyclone pipe top, communicates with cyclone pipe;
And discharge underflow pipe through the current after the spinning, underflow pipe is connected with the cyclone pipe bottom;
Wherein, second stage cyclone separator comprises:
Profit is carried out the cyclone pipe of spinning;
Smeary oil spill pipe after the discharge spinning, oil spill pipe is installed in the cyclone pipe top, communicates with cyclone pipe;
And discharge underflow pipe through the current after the spinning, and underflow pipe is connected with the cyclone pipe bottom, and wherein, at the set inside and the co-axial return line of underflow pipe of underflow pipe, the diameter of return line is less than the diameter of the underflow mouth of pipe.
Wherein, described cyclone pipe comprises that having is linked in sequence from top to bottom and is integral and cylindrical tube, the conical tube of internal communication.
Particularly, said cylindrical tube is cylindrical; The inner chamber of said conical tube becomes inverted truncated cone-shaped; Said underflow pipe is cylindrical.
Wherein, described oil spill pipe is have inner chamber cylindric; The spigot shaft coaxle of said cylindrical tube, conical tube and oil spill pipe.The inside of cylindrical tube and conical tube forms the official jargon that a coaxial confession oil-containing water stream carries out the connection centrifugal, that sedimentation is handled.
Particularly, on the sidewall of said cylindrical tube, offer water inlet pipe, introduce the separated flow of treating with certain hydraulic pressure.
Particularly, described conical tube is by that fuse and big conical tube internal communication of order and roundlet Taper Pipe are formed from top to bottom.
Wherein, the area of the xsect of said return line is 5-10 with the ratio of the cross-sectional area of underflow pipe: 100.
Particularly, the mouth of pipe of said return line stretches out the bottom of the underflow pipe of second stage cyclone separator.
Particularly, the return line height that is positioned at underflow pipe is 2-3 with the ratio of the height of underflow pipe: 10.
Particularly, get into said air-floating apparatus from effusive water between underflow pipe and the return line and carry out the air supporting removal of impurities and handle, and effusive water is back to and carries out breakdown of emulsion in the said breakdown of emulsion reaction tank and handle in the return line.
Particularly, said dissolved air release is positioned at the bottom or the middle part of the air flotation pool of said air-floating apparatus.
Wherein, said air-floating apparatus comprises that also 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 supplying;
Dissolving, the tap water of storage force (forcing) pump pumping forms pressure and holds carbonated drink;
Water sprayer adds gas in the tap water that flows into force (forcing) pump.
Particularly, said water sprayer, force (forcing) pump and dissolving are linked in sequence through pipeline; Said water sprayer is installed on the water absorption tube of force (forcing) pump, in the tap water that gets into force (forcing) pump, adds gas.
The present invention provides a kind of method of handling oil field extracted water on the other hand, comprises oil field extracted water is carried out breakdown of emulsion processing, oil-water cyclone separating treatment, air supporting processing and filtration treatment successively.
Wherein, it is in oil field extracted water, to add emulsion splitter that said breakdown of emulsion is handled, and stirring reaction 15-30min makes the oil in water emulsion breakdown of emulsion in the recovered water.
Particularly, said emulsion splitter selective polymerization aluminum chloride.
Wherein, the consumption of said emulsion splitter is to add the said emulsion splitter of 50-150mg in per 1 liter of oil field extracted water.
Wherein, said oil-water cyclone separating treatment comprises secondary at least, and wherein the one-level rotational flow separation is handled and adopted like lower separation device:
Profit is carried out the cyclone pipe of spinning;
Discharge the smeary oil spill pipe after the spinning, oil spill pipe is installed in cyclone pipe inside, communicates with cyclone pipe and extends to its top along short transverse;
And discharge underflow pipe through the current after the spinning, and underflow pipe is connected with the cyclone pipe bottom, and wherein, at the set inside and the co-axial return line of underflow pipe of underflow pipe, the diameter of return line is less than the diameter of the underflow mouth of pipe.
Particularly, the area of the xsect of said return line is 5-10 with the ratio of the cross-sectional area of underflow pipe: 100.
Particularly, the mouth of pipe of said return line stretches out the bottom of the underflow pipe of second stage cyclone separator.
Particularly, the return line height that is positioned at underflow pipe is 2-3 with the ratio of the height of underflow pipe: 10.
Particularly, get into said air-floating apparatus from effusive water between underflow pipe and the return line and carry out the air supporting removal of impurities and handle, and effusive water is back to and carries out breakdown of emulsion in the said breakdown of emulsion reaction tank and handle in the return line.
Wherein, the ratio of the flow of effusive current and the total flux of underflow pipe is 5%-10% (being that reflux ratio is 5%-10%) in the return line.
Particularly, the intake pressure that the rotational flow separation of said wherein one-level is handled is 150kPa-600kPa, and splitting ratio is 5%-10%, and the intake pressure that the rotational flow separation of another grade is handled is 150kPa-500kPa, and splitting ratio is 2%-5%.
Particularly, the intake pressure that first step rotational flow separation is handled is 150kPa-600kPa, and splitting ratio is 5%-10%; The intake pressure that second stage rotational flow separation is handled is 150kPa-500kPa, and splitting ratio is 2%-5%.
Especially, the intake pressure of rotational flow separation processing for the first time is 400kPa-600kPa, further is preferably 450kPa-500kPa; The intake pressure that the said second time, rotational flow separation was handled is 300kPa-500kPa, further is preferably 350kPa-400kPa.
Particularly, the flow of the water liquid in the return line of second stage cyclone separator is 5%-10% (being that reflux ratio is 5%-10%) with the ratio of the total flux of underflow pipe.
Particularly, in the cyclone separator that carries out second stage rotational flow separation processing, adopt like lower separation device:
Profit is carried out the cyclone pipe of spinning;
Discharge the smeary oil spill pipe after the spinning, oil spill pipe is installed in cyclone pipe inside, communicates with cyclone pipe and extends to its top along short transverse;
And discharge underflow pipe through the current after the spinning, and underflow pipe is connected with the cyclone pipe bottom, and wherein, at the set inside and the co-axial return line of underflow pipe of underflow pipe, the diameter of return line is less than the diameter of the underflow mouth of pipe.
Wherein, the WP of bubble generator is 0.3MPa-0.4MPa in the air supporting treating processes, and hydraulic detention time is 20-30min.
Particularly, the recirculation water in the air supporting removal of impurities process is 6-30 with the ratio of the flow of former water: 100, be preferably 25: 100.
Wherein, said filtration treatment adopts the polyster fibre ball to filter.
Particularly, the flow velocity of said filtration treatment is 30m/h-40m/h.
Sewage disposal device of the present invention and treatment process have following advantage:
1, oilfield sewage of the present invention adopts breakdown of emulsion processing, the processing of secondary rotational flow separation, air supporting processing and filtration treatment successively; Sewage treatment process is simple; The 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 of oil field extracted water and oil-contaminated water of oil field and handle.
2, sewage of the present invention is in rotational flow separation processing second time hydrocyclone treating processes, and the water that part is handled through rotational flow separation is back to the breakdown of emulsion pond from return line and handles, has improved the 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 the smeary water that contains that pass through after rotational flow separation is handled be refluxed again; Handle 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 able to recycle, and water outlet can be back to oil-field flooding, reaches " petroclastic rock is hidden the injection water quality proposed standard " (SY/T5329-1994) standard.The influence of oil field extracted water can not only be effectively reduced, the recycling of resource can also be realized environment.
Description of drawings
Fig. 1 is that water treating equipment of the present invention connect synoptic diagram;
Fig. 2 is a first step cyclone separator synoptic diagram in the embodiment of the invention 1;
Fig. 3 is a cyclone separator synoptic diagram in the second stage in the embodiment of the invention 1;
Fig. 4 is a first step cyclone separator synoptic diagram in the embodiment of the invention 2;
Fig. 5 is a cyclone separator synoptic diagram in the second stage in the embodiment of the invention 2.
Description of reference numerals:
1. raw waste water equalizing tank; 11. water pump; 12. under meter; 2. emulsion splitter jar; 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. big 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 release; 62. dissolved air water bubble generator; 63. force (forcing) pump; 64. dissolving; 65. water sprayer; 7. fiber ball filter; 1A. breakdown of emulsion treatment unit; 4A. cyclone separation device.
Embodiment
Specify the equipment of oil-containing sewage treatment technique process of the present invention and use thereof with reference to the accompanying drawings.
Like Fig. 1,2,3,4, shown in 5; Oil field produced water treating equipment comprise breakdown of emulsion treatment unit 1A, cyclone separation device 4A, air flotation pool 6 and the fiber ball filter 7 that passes through pipe connection in order; In addition; Also comprise oil reservoir and mummifying pool, wherein, oil reservoir is used to collect the oil slick and the isolated oil of cyclone separation device of sewage equalizing tank; Mummifying pool is used for the greasy filth that sewage treatment process produces is dewatered and concentrates, and makes its minimizing.
Breaking device 1A comprises raw waste water equalizing tank 1, emulsion splitter jar 2 and the breakdown of emulsion reaction tank 3 that connects through pipeline.
The oil field extracted water that contains silt and oil slick at first leaves standstill in raw waste water equalizing tank 1; Inject in the breakdown of emulsion reaction tank 3 through water pump 11 and under meter 12 after removing silt and part oil slick; In breakdown of emulsion reaction tank 3, mix fully with breakdown of emulsion and react with the emulsion splitter in coming from emulsion splitter jar 2; Make oil in water emulsion breakdown of emulsion, oil phase and aqueous phase separation in the oil field extracted water.
Oil field extracted water leaves standstill in equalizing tank 1, can play evenly and the buffering effect oil field extracted water on the one hand, also can tentatively remove silt and part oil slick in the sewage on the other hand, improves follow-up unitary processing efficiency.
Wherein, the consumption of emulsion splitter is to add the 50-150mg emulsion splitter in per 1 liter of oil field extracted water.
The emulsion splitter that adds among the present invention is selected Poly aluminum Chloride (PAC) for use.
Cyclone separation device 4A comprises the first step cyclone separator 4 and second stage cyclone separator 5 that connects 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 through pipeline.Oil field extracted water is carried out 2 rotational flow separation handle, profit is wherein separated under centrifugal action.
Wherein, first step cyclone separator 4 comprise to profit carry out spinning cyclone pipe 40, discharge the smeary oil spill pipe 41 after the spinning and discharge underflow pipe 42 through the current after the spinning.
By the water-in 501 entering second stage cyclone separators 5 of underflow pipe 42 effusive water, in second stage cyclone separator 5, carry out the rotational flow separation second time by second stage cyclone separator 5.
Second stage cyclone separator 5 comprise to profit carry out spinning cyclone pipe 50, discharge the smeary oil spill pipe 51 after the spinning and discharge underflow pipe 52 through the current after the spinning.
The area of the xsect 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; Get into air-floating apparatus from effusive water between underflow pipe 52 and the return line 53 and carry out air supporting removal of impurities processing; And effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53, and the ratio of water flows is 5-10 in the current of return line 53 internal reflux to breakdown of emulsion reaction tank 3 and the underflow pipe 52: 100.
The height that return line 53 is positioned at underflow pipe 52 is 2-3 with the ratio of the height of underflow pipe 52: 10.
Oil field extracted water is high speed rotating in cyclone separator, produces the high speed rotating flow field, wherein; The higher water of density is under the effect of rotational flow field; Along cyclone separator axially with radially move downwards and outwards, so just formed outer swirling flow field, discharge when arriving the underflow pipe bottom; The less oil of density upwards with inwardly moves to central axial direction, and forms the interior vortex that moves upward at central axis, discharges when arriving the oil spill pipe outlet when moving upward, and has so just reached the purpose that profit two is separated.
The oil field extracted water of handling through breakdown of emulsion gets in the first step cyclone separator through the water-in 401 of water pump 11 pressurization backs through first step cyclone separator 4; Carry out the rotational flow separation processing first time; The little oil of density flows out from the oil spill pipe 41 of first step cyclone separator 4 top center; The higher oily(waste)water of density flows out from the underflow pipe 42 of its bottom, and wherein, the water-in water flow pressure of first step cyclone separator 4 is 150kPa-600kPa; Splitting ratio is 5%-10%;
Effusive water flows in the second stage cyclone separator 5 through pipeline from first step cyclone separator 4 underflow pipes 42; Carry out the rotational flow separation processing second time; The oil spill pipe 51 of oil cyclone separator 5 top center from the second stage that density is little flows out; Underflow pipe 52 that density is higher and the water between the return line 53 get into air-floating apparatus and carry out air supporting removal of impurities processing; And effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53, and wherein, water-in 501 water flow pressure of second stage cyclone separator 5 are 150kPa-500kPa; Splitting ratio is 2%-5%; To be back to the ratio of total fluxs in the flow that carries out the current that breakdown of emulsion handles in the breakdown of emulsion reaction tank 3 and the underflow pipe 52 be 5%-10% to effusive water in the return line 53, and promptly reflux ratio is 5%-10%.
First step cyclone separator is removed the macrobead oil droplet in the oil field extracted water among the present invention; Second stage swirler-is removed the small-particle oil droplet in the oil field extracted water; Simultaneously owing to built-in one co-axial return line in the underflow pipe exit; Make the current that contain oil droplet of underflow pipe centre portions be partly refluxed to the breakdown of emulsion treatment unit; Carry out breakdown of emulsion once more and handle, reduce the water outlet of eddy flow system by concentration.
Effusive oil is sent into oil reservoir in the oil spill pipe 41,51 of two-stage cyclone separator, carries 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 the pond.Pressure air-dissolving water gets into reliever 61 by the road, and it is microbubble and outgas water about 1 μ m that relief pressure produces a large amount of diameters.
The pressure air-dissolving water that flows into air flotation pool 6 is generated by 62 preparations of pressure air-dissolving water vapor bubbles producer.Pressure air-dissolving water vapor bubbles producer 62 is connected with reliever 61 through pipeline, and it comprises force (forcing) pump 63, dissolving 64 and the water sprayer 65 that is linked in sequence through pipeline;
Water in the dissolving 64 circulates between pump and dissolving through force (forcing) pump 63; Meanwhile; The water sprayer 65 that is installed on the water pump suction pipe is inflated the water in the container tank 64 through the air-breathing mode of jet; Form pressure air-dissolving water, the pressure of the pressure air-dissolving water for preparing among the present invention is 0.3MPa-0.4MPa.
When the side of the current of handling through rotational flow separation from air flotation pool 6 gets into, flow in the process of opposite side of air flotation pool 6, the greasy dirt in the current contacts with a large amount of microbubbles of dissolved air release 61 releases in the air flotation pool; And and bubble adhesion; Form the air float body of density, under buoyancy function, float to the water surface less than water; Form scum silica frost, thereby removed the greasy dirt in the water.Hydraulic detention time is 20-30min in the air flotation pool.
Filtration unit is a fiber ball filter 7, and oil removal by air bubbling water is carried out 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 among the present invention has huge surface-area and good adsorption ability, thus effects such as the interception through filamentary material, filtration, absorption further the micro-oil content removed in the air supporting treat effluent of absorption guaranteed that effluent quality satisfies " petroclastic rock is hidden the injection water quality proposed standard " (SY/T5329-1994) water quality standard.)
Filtration flow-rate 30m/h-40m/h in the filter process of the present invention.When gross head is above with a toll of 1.4m-1.8m, finish to filter.
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.
Specify oil field extracted water technological processes of the present invention with reference to the accompanying drawings.
Embodiment 1
Carry out the recovered water in oil field handles according to flow process as shown in Figure 1.The oleaginousness of oil field extracted water is 2300mg/L.
1) breakdown of emulsion is handled
Oil field extracted water is imported raw waste water equalizing tank 1, and recovered water leaves standstill in equalizing tank 1, tentatively removes silt and part oil slick in the sewage, then the water outlet of equalizing tank is imported breakdown of emulsion reaction tanks 3 through under meter 12;
The emulsion splitter Poly aluminum Chloride (PAC) flows out in emulsion splitter jar 2, sends in the breakdown of emulsion reaction tank 3 through under meter 12, mixes with oil field extracted water; Carry out the breakdown of emulsion reaction; Oil in water emulsion breakdown of emulsion in the sewage is separated from each other oil phase, water in the recovered water and obtains the breakdown of emulsion treating water, wherein; The amount of the emulsion splitter Poly aluminum Chloride (PAC) that adds is the 150mg/L oil field extracted water, and the breakdown of emulsion reaction times is 15min.
2) rotational flow separation is handled
The breakdown of emulsion treating water sent into through pressure pump 11 carry out rotational flow separation processing first time in the first step cyclone separator 4 (like Fig. 2); 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 to be linked in sequence from top to bottom and is integral and the cylindrical tube 402 of internal communication, big conical tube 403 and roundlet Taper Pipe 404, and wherein, big conical tube 403 is inverted truncated cone-shaped with roundlet Taper Pipe 404; The diameter of its upper surface is greater than the diameter of lower surface, and the lower surface diameter of big conical tube 403 is identical with roundlet Taper Pipe 404 upper surface diameters.
From the underflow pipe 42 of first step cyclone separator 4, flow out in higher oily(waste)water entering second stage cyclone separator 5 (like the Fig. 3) of density and carry out the rotational flow separation processing 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 to be linked in sequence from top to bottom and is integral and the cylindrical tube 502 of internal communication, big conical tube 503 and roundlet Taper Pipe 504.Wherein, oil spill pipe 51 is placed in the cylindrical tube 502, communicates with cylindrical tube 502 and stretches out the top of cylindrical tube 502 along short transverse; Water inlet pipe 501 is opened on the sidewall of cylindrical tube 502; Cylindrical underflow pipe 52 links to each other with the bottom of roundlet Taper Pipe 504; And set inside and the co-axial return line 53 of underflow pipe at underflow pipe 52; The diameter of return line 53 is less than the diameter of underflow pipe 52; The area of the xsect 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 height that return line 53 is positioned at underflow pipe 52 is 2: 10 with the ratio of the height of underflow pipe 52, get into air-floating apparatus from effusive water between underflow pipe 52 and the return line 53 and carry out the air supporting removal of impurities and handle, and effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53.
After the rotational flow separation processing; The oil spill pipe 51 of oil cyclone separator 5 top center from the second stage that density is little flows out; What density was higher carries out air supporting removal of impurities processing from effusive rotational flow separation treating water entering air-floating apparatus between underflow pipe 52 and the return line 53; And effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53, and wherein, the water-in water flow pressure of control second stage cyclone separator 5 is 350kPa; Splitting ratio is 5%; To be back to the ratio of the total flux of current in the flow that carries out the current that breakdown of emulsion handles in the breakdown of emulsion reaction tank 3 and the underflow pipe 52 be 10% to effusive water in the return line 53, and promptly reflux ratio is 10%.
3) air supporting is handled
With the rotational flow separation treating 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 the 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 WP 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 is the fiber ball filter 8 of terylene through filtering material with the flow velocity of 30m/h; Wherein, the fibrous nodules diameter is 32mm-35mm, and voidage is that the hydromining after 96.1% filtration detects its oleaginousness with infrared spectrophotometry; Oleaginousness is 4.7mg/L in the water, and oil removal rate is 99.8%.
, reach " petroclastic rock is hidden the injection water quality proposed standard " and (SY/T5329-1994), can directly be used for oil-field flooding less than 5mg/L through the oleaginousness in the water of fibre-ball filtration.
Embodiment 2
Consumption except the emulsion splitter Poly aluminum Chloride (PAC) in the breakdown of emulsion treating processes is the 50mg/L oil field extracted water, and the breakdown of emulsion reaction times is outside the 30min, and all the other are identical with embodiment 1.
In the rotational flow separation treating processes; First step cyclone separator 4 (shown in Figure 4) comprises water inlet pipe 401, cyclone pipe 40, oil spill pipe 41 and underflow pipe 42; Wherein, cyclone pipe 40 is integral by being linked in sequence from top to bottom and cylindrical tube 402, the conical tube 405 ' form of internal communication.Wherein, oil spill pipe 41 is placed in the cylindrical tube 402, communicates with cylindrical tube 402 and extends to its top along short transverse; Water inlet pipe 401 is opened on the sidewall of cylindrical tube 402; Underflow pipe 42 is cylindrical, links to each other with the bottom of conical tube 405, derives the current after rotational flow separation is handled.
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 integral by being linked in sequence from top to bottom and cylindrical tube 502, the conical tube 505 ' form of internal communication.Wherein, oil spill pipe 51 is placed in the cylindrical tube 502, communicates with cylindrical tube 502 and extends to its top along short transverse; Water inlet pipe 501 is opened on the sidewall of cylindrical tube 502; Cylindrical underflow pipe 52 links to each other with the bottom of conical tube 505; And set inside and the co-axial return line 53 of underflow pipe at underflow pipe 52; The diameter of return line 53 is less than the diameter of underflow pipe 52; The area of the xsect 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 height that return line 53 is positioned at underflow pipe 52 is 3: 10 with the ratio of the height of underflow pipe 52, get into air-floating apparatus from effusive water between underflow pipe 52 and the return line 53 and carry out the air supporting removal of impurities and handle, and effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53.
After the rotational flow separation processing; The oil spill pipe 51 of oil cyclone separator 5 top center from the second stage that density is little flows out; What density was higher carries out air supporting removal of impurities processing from effusive rotational flow separation treating water entering air-floating apparatus between underflow pipe 52 and the return line 53; And effusive water is back to and carries out breakdown of emulsion in the breakdown of emulsion reaction tank 3 and handle in the return line 53, and wherein, the water-in water flow pressure of control second stage cyclone separator 5 is 400kPa; Splitting ratio is 2%; To be back to the ratio of the total flux of current in the flow that carries out the current that breakdown of emulsion handles in the breakdown of emulsion reaction tank 3 and the underflow pipe 52 be 5% to effusive water in the return line 53, and promptly reflux ratio is 5%.
In the air supporting treating processes, except the pressure of pressure air-dissolving water is 0.3Mpa, promptly the WP of bubble generator is 0.3MPa, and air supporting is except that miscellaneous time is 30min, and all the other are identical with embodiment 1.
In the filter process, except flow velocity is 40m/h, all the other are identical with embodiment 1.
Detect its oleaginousness through the hydromining after the filtration treatment with the infrared spectrophotometry method, oleaginousness is 4.8mg/L in the water, and oil removal rate is 99.8%.
, reach " petroclastic rock is hidden the injection water quality proposed standard " and (SY/T5329-1994), can directly be used for oil-field flooding less than 5mg/L through the oleaginousness in the water of fibre-ball filtration.
Embodiment 3
Except the intake pressure of first step cyclone separator 4 is 150kPa; Get into second stage cyclone separator 5 after the higher oily(waste)water of effusive density passes through the processing of force (forcing) pump from the underflow pipe 42 of first step cyclone separator 4; The control intake pressure is outside the 150kPa, and all the other are identical with embodiment 1, detects its oleaginousness through the hydromining after the filtration treatment with the infrared spectrophotometry method; Oleaginousness is 4.9mg/L in the water, and oil removal rate is 99.8%.
, reach " petroclastic rock is hidden the injection water quality proposed standard " and (SY/T5329-1994), can directly be used for oil-field flooding less than 5mg/L through the oleaginousness in the water of fibre-ball filtration.
Claims (10)
1. oil field produced water treating equipment, comprise be linked in sequence like lower device:
Breakdown of emulsion treatment unit (1A) utilizes emulsion splitter to make the oil in water emulsion breakdown of emulsion in the oil field extracted water and realizes oil phase and aqueous phase separation;
Cyclone separation device (4A) carries out eddy flow to oil field extracted water and handles, and makes oily water separation wherein;
Air-floating apparatus is through in oil field extracted water, feeding pressure air-dissolving water, make the microbubble contact that forms behind the pressure air-dissolving water relief pressure, so that remove greasy dirt;
Filtration unit: oil field extracted water is filtered.
2. oil field sewage treating equipment as claimed in claim 1 is characterized in that:
Breakdown of emulsion treatment unit (1A) comprises breakdown of emulsion reaction tank (3) and to the emulsion splitter jar (2) of breakdown of emulsion reaction tank supply emulsion splitter;
Cyclone separation device (4A) comprises secondary cyclone separator (4,5);
Air-floating apparatus has air flotation pool (6) and is placed in the dissolved air release (61) in the air flotation pool;
Filtration unit is fiber ball filter (7), is provided with in it profit is carried out filtering fibrous nodules.
3. oil field sewage treating equipment as claimed in claim 2 is characterized in that:
In the said secondary cyclone separator (4,5), wherein primary cyclone (4) comprising:
Profit is carried out the cyclone pipe (40) of spinning;
Smeary oil spill pipe (41) after the discharge spinning, oil spill pipe (41) is installed in cyclone pipe (40) top, communicates with cyclone pipe (40);
And discharge underflow pipe (42) through the current after the spinning, underflow pipe (42) is connected with cyclone pipe (40) bottom;
Another grade cyclone separator (5) comprising:
Profit is carried out the cyclone pipe (50) of spinning;
Smeary oil spill pipe (51) after the discharge spinning, oil spill pipe (51) is installed in cyclone pipe (50) top, communicates with cyclone pipe (50);
And the underflow pipe (52) of discharging the current after the process spinning; Underflow pipe (52) is connected with cyclone pipe (50) bottom; Wherein, at the set inside and the co-axial return line of underflow pipe (53) of underflow pipe (52), 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 comprises that also 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 supplying;
Dissolving (64), the tap water of storage force (forcing) pump pumping forms pressure air-dissolving water;
Water sprayer (65) adds gas in the tap water that flows into force (forcing) pump.
5. a method of handling oil field extracted water is characterized in that comprising oil field extracted water is carried out 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 it is in oil field extracted water, to add emulsion splitter that said breakdown of emulsion is handled, and stirring reaction 15-30min makes the oil in water emulsion breakdown of emulsion in the recovered water.
7. like claim 5 or 6 described treatment processs, it is characterized in that said oil-water cyclone separating treatment comprises secondary at least, wherein the one-level rotational flow separation is handled and is adopted like lower separation device:
Profit is carried out the cyclone pipe (50) of spinning;
Smeary oil spill pipe (51) after the discharge spinning, oil spill pipe (51) is installed in cyclone pipe (50) top, communicates with cyclone pipe (50);
And the underflow pipe (52) of discharging the current after the process spinning; Underflow pipe (52) is connected with cyclone pipe (50) bottom; Wherein, at the set inside and the co-axial return line of underflow pipe (53) of underflow pipe (52), 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 rotational flow separation processing of said wherein one-level is 150kPa-600kPa; Splitting ratio is 5%-10%, and the intake pressure that the rotational flow separation of another grade is handled is 150kPa-500kPa, and splitting ratio is 2%-5%.
9. like claim 5 or 6 described treatment processs, the WP that it is characterized in that bubble generator in the air supporting treating processes is 0.3MPa-0.4MPa, and hydraulic detention time is 20-30min.
10. like claim 5 or 6 described treatment processs, it is characterized in that said filtration treatment adopts the polyster fibre ball to filter.
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