CN100569671C - Process for treating oil field sewage - Google Patents

Process for treating oil field sewage Download PDF

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Publication number
CN100569671C
CN100569671C CNB2007100644070A CN200710064407A CN100569671C CN 100569671 C CN100569671 C CN 100569671C CN B2007100644070 A CNB2007100644070 A CN B2007100644070A CN 200710064407 A CN200710064407 A CN 200710064407A CN 100569671 C CN100569671 C CN 100569671C
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water
sewage
oil
mud
treating oil
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CNB2007100644070A
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CN101054244A (en
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王法轩
潘卫国
乔国发
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安东石油技术(集团)有限公司
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Abstract

A kind of process for treating oil field sewage comprises following operation: 1, oil removal by air bubbling operation comprises: bubbling air or Sweet natural gas in oily(waste)water, and make and produce bubble in the water, the dispersion oil droplet in the water is bonded on the bubble, floats on the surface with gas and is reclaimed; 2, ion is adjusted operation: the water that purifies through operation 1 enters mixing tank, adds chemical agent to remove objectionable impurities in mixing tank; 3, rapid subsidence operation: the sewage that comes out through operation 2 adds coagulating agent and iron powder, sedimentation in slurry tank by being pumped into mixing tank in jar; 4, the clear water that comes out of slurry tank is delivered to the strainer operation and is obtained clear water; 5, the mud after the sedimentation is delivered to the centrifugal dewatering of sludge operation.Advantage of the present invention: the plant area area is little, oil removal efficiency and quality height, and the 1.5mm/a of the erosion rate of sewage before by modification is reduced to 0.076mm/a; Settling velocity is fast; Backwashing time is long at interval, and backwashing time shortens; Moisture dropping to below 70% in the mud.

Description

Process for treating oil field sewage
Technical field
The present invention relates to a kind of process for treating oil field sewage.
Background technology
China's developed field belongs to waterflooding more than 90%, current oil field comprehensive water cut has reached 89%, daily output sewage quantity 4,000,000 m 3, adding the well-flushing water of every day, drilling well, operation, mechanical cooling apparatus, place cleaning water etc. are estimated 5,000,000 m 3About/d.
The sewage that the oil field produces is no matter be used for discharging or being used for utilizing as oilfield injection water all needs to carry out earlier sewage disposal.The existing 5000m in the whole nation 3/ d-30000m 3About 300 of the sewage plants of/d processing power, these sewage workss are operation continuously in 24 hours basically.
Current process for treating oil field sewage comprises: gravity type boat davit sewage water treatment method, pressure type sewage water treatment method and flotation formula sewage water treatment method, wherein:
One, gravity type boat davit sewage water treatment method (as shown in Figure 1), its treatment step is successively: add inhibiter, Scale inhibitors and sterilant in the former water of sewage, the water conservancy of utilizing nature to remove oil tank and carry out nature (or swash plate) oil removing---utilize the coagulant precipitation jar to carry out coagulant precipitation to add coagulating agent from naturally except that the sewage that comes out the oil tank, remove suspended substance---to come out from the coagulant precipitation jar is carried out pressure (or gravity) machine that removes by filter with pressure filter and is mixed to be purified water.This method mainly is to rely on gravity (profit density difference) that oil is removed, and the assorted sedimentation of suspended substance and machine is discharged, and is purified water through filtering.The advantage of this method is that technology is simple, can remove particulate matter and oil in anhydrating.The main drawback of this method, equipment volume is big, oil removing, remove suspended substance, to remove the machine miscellaneous time long, efficient is low, the water quality instability, mud can't be handled, and pollutes environment.
Two, pressure type sewage water treatment method (as shown in Figure 2); its treatment step is successively: add inhibiter, Scale inhibitors and sterilant in the former water of sewage, utilize eddy flow (or vertical) to remove oil tank and remove oil in the sewage---will remove the sewage that comes out the oil tank from eddy flow (or vertical) utilize the coarse coalescer to carry out coarse separation---adding coagulating agent in the sewage that will come out from the coarse coalescer utilizes the pressure slurry tank to carry out the pressure sedimentation---, and the sewage that will come out from the pressure slurry tank utilizes the I and II pressure filter to filter to be purified water.This method treatment and purification efficient height, sewage are short than the gravity type boat davit flow process time in treatment scheme, but there is the fluctuation of the amount of being subject to processing in this method and causes the unsettled shortcoming of water quality.Especially because flocculation time is long, pressure slurry tank quantity is increased, floor space is big, and investment is high.The filtrate of strainer is a traditional type in addition, and is seriously polluted, and life cycle is short.Mud can not get handling and reclaiming.
Three, flotation formula sewage water treatment method (as shown in Figure 3), its treatment step is successively: add inhibiter, Scale inhibitors and sterilant in the former water of sewage, utilize surge tank to carry out pre-treatment---to the sewage that comes out from surge tank, add flotation agent, coagulating agent, utilize jet or induce flotation unit to separate---will or induce the water conservancy of coming out the flotation unit to filter from jet with pressure filter.This method is owing to use air supporting, the sewage treating efficiency height, and the level of automation height, prefabricated degree height, the work on the spot amount is little, is suitable for offshore oilfield and uses.But shortcoming is that the assorted sedimentation of its machine all is added in the pressure filter, so filtrate is seriously polluted owing to simplified sedimentation process, and backwash volume is big, and mud can not get handling, and water quality stability is poor.
All there is certain defective in existing sewage water treatment method, and existing sewage water treatment method also exists the common shortcoming:
1, contains dissolved oxygen O, CO in the sewage after the processing 2, HS -, HCO 3 -, Mg 2+, Ca 2+, Fe 2+, sulphate reducing bacteria objectionable impuritiess such as (SRB), sewage after the processing as the re-injection water conservancy time spent can occur fouling, bacterial reproduction, and objectionable impurities to corrosion such as surface pipeline, storage tank, OIH sleeve pipes, bring the very big maintenance workload and the input of fund to the oil field.As the statistics in 2000-2004 of Shengli Oil Field, sewage main line perforation 3443 times, environmental protection is compensated 6,865 ten thousand yuan, only change expensive 1.05 hundred million yuan of waterflood-transmission line, the highest erosion rate surpasses 31 times of national standard 0.076mm/a up to 2.5mm/a, and 21% water injection well causes cased perforated because of corrosion.
2, the moisture height of the mud that settles down after the sewage disposal can't be handled serious environment pollution.In the disposing polluted water in oil process, every substantially 1000m 3In the sewage, produce 1.0-1.5m 3/ 1000m 3Mud, current is 92% with the sludge moisture content after the trigger squeeze processing, gives transportation, handles and cause difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of process for treating oil field sewage, present method overcomes under the gravity condition, nature oil removing, the swash plate oil removing time is long, the shortcoming that container volume is big, has improved settling efficiency and filtration velocity at the residence time of shortening sewage, improve quality of sewage disposal, reduce fouling, the etching problem of filter back water, reduce the water content in the mud, loading and the transportation of being convenient to mud are handled.
For achieving the above object, the present invention takes following design: this process for treating oil field sewage comprises following operation:
(1), the oil removal by air bubbling operation, it comprises: bubbling air or Sweet natural gas in oily(waste)water, make to produce bubble in the water, the oil droplet that is dispersed in the water is bonded on the bubble, floats on the surface with gas and is reclaimed;
(2), ion is adjusted operation: the water that purifies through the oil removal by air bubbling operation enters mixing tank, is added with ion in the water and adjusts agent, to remove objectionable impurities;
(3), rapid subsidence operation: the sewage that ion adjustment operation is come out is added with flocculation agent and iron powder by being pumped into stirred pot in the water, the water that goes out rice from stirred pot enters slurry tank, and sedimentation in slurry tank.;
(4), the water that comes out of slurry tank delivers to the strainer operation, obtains clear water;
(5), the mud that comes out of slurry tank is delivered to the centrifugal dewatering of sludge operation.
Mud after the described sedimentation is delivered to the sludge dewatering operation behind the iron step for regeneration.
Described strainer operation is provided with back flushing equipment.
Described backwashing water inserts withdrawing can and returns the oil removal by air bubbling operation again.
Advantage of the present invention is: oil removal by air bubbling, and replace present vertical vat to add swash plate natural gravity deoiling method, the plant area area dwindles, and oil removal efficiency and quality improve; Add and adjust the agent operation oilfield sewage is carried out modification, the 1.5mm/a of the erosion rate of sewage before by modification is reduced to 0.076mm/a, and it is up to standard for successive years to inject water quality, the complete compatibility in sewage after the processing and stratum; Add iron powder, strengthened the quality of agglomerated thing, accelerated settling velocity; The quartz sand that filters in the filtrate changes artificial porcelain granule into, improves the porosity and the surface adsorption ability of filtering layer, and the filtering velocity of the strainer after the improvement is brought up to more than the 20m/h by 8 original~12m/h, and the assorted content of the machine after the filter has improved 1 times less than 1mg/L than former strainer; The backwashing time of strainer extended to 12 hours by original 8 hours at interval, and backwashing time shortened to 1.5 hours by 3 hours, and effect improves 1 times; The sediment that each operation settles down pumps into centrifugal sludge dewatering equipment, makes moisture the dropping to below 70% in the mud, greatly facilitates the loading and the roping difficult problem of mud.
Description of drawings
Fig. 1 gravity type boat davit sewage disposal schema
Fig. 2 pressure type sewage disposal schema
Fig. 3 flotation formula sewage disposal schema
Fig. 4 process flow diagram of the present invention
Fig. 5 a is existing filter structure schematic representation
Fig. 5 b filter structure schematic representation of the present invention
Among Fig. 1, Fig. 2, Fig. 3, Fig. 5 a, Fig. 5 b, 20 for removing oil tank naturally, and 21 is the coagulant precipitation jar, and 22 is to delay to fill jar, and 23,25,28,30,33,36,39 is pump, and 24 is pressure filter, and 26 is backwash tank, and 27 for reclaiming water pot, and 29 is slop oil tank.31 is that eddy flow (or vertical) removes oil tank, and 32 be the coarse coalescer, and 34 is the pressure slurry tank, and 35 is the I and II pressure filter, and 37 is surge tank, and 38 are jet or induce flotation unit, and 40 is pressure filter, and 41 is meticulous filter tank.
Among Fig. 5 a, 42-1,12-1 are anthracite coal measure, and 42-2 is a quartz sand layer, and 42-3,12-3 are magnetite layer, and 42--4,12-4 are pebble bed, and 12-2 is the artificial porcelain granule layer, and 42-5,12-5 are distributing main, and 42-6,12-6 are range pipe.
Among Fig. 4,1 is oil removal by air bubbling equipment, and 2 is mixing tank, and 3 is sump pump, and 4 is stirred pot, and 5 is slurry tank, 6 is pump, and 7 is slop oil tank, and 8 is pump, and 9 is withdrawing can, and 10 is backwash tank, 11 is pump, and 12 is strainer, and 13 is the iron powder revivifier, and 14 is transportation means, and 15 is the mud separating machine.
Be divided into five operations among Fig. 4, that is: the oil removal by air bubbling operation is (in the FB(flow block) to be scribed ss the boundary, represent with alphabetical A), same, also have ion to adjust process B, rapid subsidence operation C, filtering under pressure step D and sludge dewatering operation E, above-mentioned each operation construction can connect pipe arrangement and equipment earlier (abbreviation module), install to on-the-spot, the factory prefabricating degree is reached more than 70%.The manufacturing and the installation period of shortening equipment improve workmanship greatly, save facility investment 40%.
Embodiment
Oil removal by air bubbling is exactly bubbling air in oily(waste)water (or Sweet natural gas), produces micro bubble in water, can add flotation agent and coagulating agent simultaneously, the dispersion oil droplet of 0.25-25 μ m in the sewage is sticked on the bubble, keep afloat with gas and reclaimed, thereby reach the purpose of oil removing.
The surface energy formula
W=σ·S
W in the formula---surface energy, J;
σ---surface energy, N/m;
S---liquid surface area, m 2
Surface energy is the potential energy that is stored in fluid surface, the interfacial tension that the profit contact produces, and oil droplet is that spherical distribution is in water.Contain in the sewage of dispersed oil when air is fed, form a large amount of micro-bubbles, elaioleucite is just as having the trend that adheres on the bubble with water.
Air-float method can also adopt jet air float method, induction flotation method, porous material air blast gas distribution air supporting method etc. except dissolved air flotation.
In the oil removal by air bubbling operation, the chemical agent that adds in raw waste water has Scale inhibitors commonly used, inhibiter, sterilant, can also add flotation agent (sulfonated petro-leum).
The purpose that adds Scale inhibitors is: introduce impurity in crystal, hinder the crystalline further growth, or the crystalline lattice is deformed, make become loose swelling and be easy to be taken out of system by current of crystal, Scale inhibitors has inorganic Scale inhibitors such as sodium phosphate etc.
The purpose that adds inhibiter is: it can suppress or reduce the corrosion speed of metal and alloy.Inhibiter commonly used: inorganic inhibitor, organic inhibitor, composite corrosion inhibitor, tensio-active agent, for example: poly-phosphate, organic amine etc.
Sterilant commonly used has: 1227 and glutaraldehyde etc.
In the inventive method, after the oil removing operation, a mixing tank is set, and what enter mixing tank is added with chemical substance (be called for short ion and adjust agent) with the reaction of water intermediate ion in the purifying waste water of oil removal by air bubbling, this ion adjust agent be compound alkali promptly: by NaOH and Ca (OH) 2Mix, utilize " the OH in the alkali -" ionic reaction that contains in ion and the water, the objectionable impurities in the water is removed.Its reaction has:
1) OH -With H +Generate H 2O also removes the HCO in anhydrating 3 -, and then generate CaCO 3Precipitation;
2) since water in dissolved oxygen O with Fe 2+Be oxidized to Fe 3+, utilize OH -Generate Fe (OH) 3Precipitation;
3) OH -With HS -Reaction generates S 2-, S 2-Generate sulfide precipitation with polyvalent metal ion;
4) utilize effect of volume collection and the OH that generates precipitation process -Germicidal action, remove SRB;
5) OH -Add in the sewage, the pH value that can adjust sewage becomes neutral, has strengthened the compatibleness of sewage and oil reservoir.
In order to quicken sedimentation, connect a stirred pot that has an agitator at the pump discharge that connects mixing tank, enter and be added with flocculation agent (polyacrylamide) and iron powder in the water in the stirred pot.
Described flocculation agent is Tai-Ace S 150, ferric sulfate, polymeric aluminum, and the bases in they and the water generates hydrous oxide and plays coagulation.
Embodiment
In following examples, be with each master operation among the present invention with improve before the comparison that experimentizes of corresponding operation, the result is as follows:
Embodiment 1
Adopt the oil removal by air bubbling operation, replace present vertical vat to add swash plate natural gravity deoiling method.
Daily handling ability 20000m 3The disposing polluted water in oil station of/d.The big tank volume of separating oil removing by natural gravity is 5000m 3Two, floor space 4545.5m 2* 2 is 909m 2, make water crude content 750mg/L, handle the back oil-containing and drop to 30-50mg/L.Under the identical condition of treatment capacity, adopt the air-float method oil removing, adopt the induction flotation method, equipment is the YTF type induction flotation machine that Chenglu Environmental Engineering Co., Ltd., Yangzhou produces, it is floating that this equipment adopts the pneumatic blending mode to drive aqueous vapor, need not add gas floatation agent, and the volume of this device is 100m 3* 2 is 200m 3, floor space 20m 2* 2 is 40m 2,, can make the water oleaginousness to reduce to 20~30mg/L by 750mg/L through oil removal by air bubbling.Hence one can see that, and oil removal by air bubbling is than the natural gravity oil removing process, and the plant area area dwindles 23 times, and oil removal efficiency and quality improve.
Embodiment 2
Employing adds ion to be adjusted the method for agent and removes oxious component in the oilfield sewage, has not only alleviated the metallic corrosion of waterflood system but also guaranteed the compliance rate of injecting water quality, has improved the sewage after handling and the compatibleness of oil-reservoir water.
Sewage at 0.5~1mm/a, exceeds 6.5~13 times of national regulation 0.076mm/a standard to the rate of metal corrosion of jar, pipe, pump, well.Inject water quality pH value slant acidity and stratum and be incompatible, cause oil layer blocking; Sewage machine after the processing is assorted to exceed standard with particle diameter.
Employing adds ion adjustment agent oilfield sewage is carried out modification:
Technological operation: added compound alkali before entering mixing tank behind the sewage degrease, the concentration that makes compound alkali in the water is 300~500mg/L, and compound alkali is by NaOH and Ca (OH) 2Form, wherein NaOH and Ca (OH) 2Weight ratio be 1.5~1.0: 1, add coagulating agent (polymeric aluminum) again, its concentration is 150mg/L, and pH value is adjusted to about 7.5 by 6.5, balance O, Co 2, HS -, HCO 3 -, Fe 2+, and portion C a 2+, Mg 2+Etc. objectionable constituent, sulphate reducing bacteria and saprophytic microorganism have been killed simultaneously.The basic total mineralization of oilfield sewage that keeps is constant, therefore and oil-reservoir water compatibleness is preferably arranged.The water quality reaching standard rate guarantees up to standard continuously.
The key technical indexes and contrast as follows: use before and after the ionic equilibrium method
The water quality title Before ion is adjusted After ion is adjusted Issuing standard
The filter membrane factor ??21 ??33 ??>15
PH value ??5.5-6.5 ??7.5 ??7-7.5
Oil-containing mg/L ??10 ??0 ??<5
Total iron mg/L ??4000 ??0.3 ??<0.5
Suspended substance mg/L ??260 ??0.3 ??<2
Sulphate reducing bacteria/L ??10 3 ??10 1 ??<10 3
Erosion rate mm/a ??1.5 ??<0.076 ??<0.076
Transmittance ??85 ??98 ??95
Embodiment 3
Except that adding flocculation agent, also added iron powder before entering slurry tank, the granularity of iron powder is at 40-500nm, the concentration that makes iron powder in the water is 70-100mg/L, make in coalescent suspended substance and the mechanical impurity and be mixed into iron powder, strengthened the quality of agglomerated thing, accelerated settling velocity greatly.Through oil field practice application, day processing 20000m 3The volume of the slurry tank of/d ability has only original 5000m 3/ 10th of a sedimentation cylinder.The settling velocity that suspended substance and machine are mixed shortens to 1h by 8~12h of former technical process.Settling efficiency improves 7-13 doubly.This just equals handling under the same sewage quantity scale, and the volume of sewage slurry tank can dwindle 7~13 times.The manufacturing cost and the floor space of device have been saved.
In the method, for the purpose of the saving cost, need reclaim iron powder usually, the method for recovery can be adorned a magnet in the mud outlet of slurry tank, and iron powder is inhaled on magnet, is reclaimed.
Embodiment 4
By changing the filtrate composition and the arranging situation of strainer, improve filtration velocity and water quality.Strainer before and after improving is asked for an interview shown in Fig. 5 a, Fig. 5 b.
The top-down arrangement of filtrate in the pressure filter of oilfield sewage use at present is: anthracite coal measure, quartz sand layer, magnetite layer, and its shortcoming: (1) filtering velocity is low; When (2) machine is assorted and exceed standard; (3) easily pollution causes back flushing number of times and flushing dose to increase.The filtrate ordering of former strainer and the selection of filtrate are improved.Change quartz sand into artificial porcelain granule,, therefore improved the porosity and the surface adsorption ability of filtering layer because the sphericity and the circularity surfaceness of haydite all are better than quartz sand.
The setting of the filter material layer of the strainer after the improvement, filtering material particle size, thickness of filter bed are asked for an interview following table 1 and table 2.The filtering velocity of the strainer after the improvement is brought up to more than the 20m/h by 8 original~12m/h; The assorted content of machine after the filter has improved 1 times less than 1mg/L than former strainer; Backwashing time extended to 12 hours by original 8 hours at interval, and backwashing time shortened to 1.5 hours by 3 hours, and effect improves 1 times.
Each filter material layer material of table 1, specification
Table 2 is positioned at supporting layer material, the specification below the filtrate bottom
Level (from top to bottom) Material Grain is through mm Thickness mm
??1 Magnetite ??1-2 ??70-100
??2 Magnetite ??2-4 ??60-100
??3 Cobble ??4-8 ??60-100
??4 Cobble ??8-6 ??60-120
Described supporting layer material, specification can be selected from the data of table 2, can be to establish one deck cobble, one deck magnetite, and their particle diameter is respectively between the 4-8 and between the 1-4.The order of above-mentioned each layer is constant, to help filtering the quality with back flushing.
The setting of the filter material layer of the strainer after the improvement, filtering material particle size, thickness of filter bed are asked for an interview following table 1 and table 2.The filtering velocity of the strainer after the improvement is brought up to more than the 20m/h by 8 original~12m/h; The assorted content of machine after the filter has improved 1 times less than 1mg/L than former strainer; Backwashing time extended to 12 hours by original 8 hours at interval, and backwashing time shortened to 1.5 hours by 3 hours, and effect improves 1 times.
Embodiment 5
Adopt centrifugal method to replace present press filtration method to solve the mud height and contain water problems.
The on-the-spot at present plate pressure filter that uses is squeezed into the plate pressure filter with spiral pump with muddy water, makes the moisture of mud reach 92% through press filtration.Because humidity is too big, can't load and roping, form a great problem that is in sewage works.The centrifugal sludge dewatering equipment (model of centrifuge is LW400-1750NY) of Shanghai centrifugal machine Research Institute can replace original plate pressure filter recently, makes moisture the dropping to below 70% in the mud, greatly facilitates the loading and the roping difficult problem of mud.
Embodiment 6
The entire sewage treatment system adopts " ATC " coating to carry out internal and external anti-corrosive.
The Resins, epoxy and the glass-reinforced plastic material of disposing polluted water in oil system employing at present carry out internal and external anti-corrosive, become fragile because these two kinds of materials are easily aging, and generation crackle and delamination later in 1 year is at O, Co 2, H 2S -, HCo 3Under the effect etc. objectionable impurities, cause corrosion failure very soon, therefore, a life-span of investing 3,000 ten thousand yuan~5,000 ten thousand yuan sewage works has only 5~8 years.In order to prolong the life-span of sewage works, " ATC-3000S " coating system that internal and external anti-corrosive uses Anton Oilfield Services (Group) Ltd. to produce carries out internal and external anti-corrosive, and sewage works is reached more than 15 years work-ing life.
ATC-3000S is a high-temperature-resistant high-pressure-resistant modified phenolic liquid coating, its performance: (1) heatproof 200 degree; (2) the withstand voltage yield strength that reaches No. 45 steel tubings; (3) thickness 150-300 is trifling; (4) surfaceness<5 micron; (5) anti-CO 2:>95mol%; (6) anti-H 2S:>10mol%; (7) anti-CL -:>500000PPm; (8) pH value scope: 3-13.
Be used at present: oil pipe, sleeve pipe, drilling rod, gathering line, valve, pump, pipe fitting etc.

Claims (9)

1, a kind of process for treating oil field sewage is characterized in that: it comprises following operation:
(1), the oil removal by air bubbling operation, it comprises: bubbling air or Sweet natural gas in oily(waste)water, make to produce bubble in the water, the oil droplet that is dispersed in the water is bonded on the bubble, floats on the surface with gas and is reclaimed;
(2), ion is adjusted operation: the water that purifies through the oil removal by air bubbling operation enters mixing tank, is added with ion in the water and adjusts agent, and to remove objectionable impurities, it is compound alkali that described ion is adjusted agent, and compound alkali is by NaOH and Ca (OH) 2Form;
(3), rapid subsidence operation: the sewage that ion adjustment operation is come out is added with flocculation agent and iron powder by being pumped into stirred pot in the water, the water that comes out from stirred pot enters slurry tank, and sedimentation in slurry tank;
(4), the water that comes out of slurry tank delivers to the strainer operation, obtains clear water;
(5), the mud that comes out of slurry tank is delivered to the centrifugal dewatering of sludge operation.
2, process for treating oil field sewage according to claim 1 is characterized in that: the concentration of compound alkali in water is 300~500mg/L.
3, process for treating oil field sewage according to claim 2 is characterized in that: wherein NaOH and Ca (OH) 2Weight ratio be 1.5~1.0: 1.
4, process for treating oil field sewage according to claim 1 and 2 is characterized in that: after adding iron powder in the rapid subsidence operation, the concentration of iron powder is between the 70mg/L-100mg/L in the water; The granularity of iron powder is 40~500nm.
5, process for treating oil field sewage according to claim 1 and 2, it is characterized in that: the filtrate in the described strainer is respectively hard coal, artificial porcelain granule, magnetite from top to bottom, and the particle diameter of hard coal, artificial porcelain granule, magnetite is respectively 0.8-2.0mm; 0.45-0.9mm; 0.25-0.5mm; The height of the bed of material is respectively 300-420mm; 230-300mm; 90-150mm is magnetite layer below the filtrate bottom, and following again is pebble bed, and particle diameter is respectively 1-4mm and 4-8mm.
6, process for treating oil field sewage according to claim 5 is characterized in that: be one deck magnetite layer below the filtrate bottom, following again is one deck pebble bed.
7, process for treating oil field sewage according to claim 1 is characterized in that: the mud after the described sedimentation after the magnet absorption of the iron in the mud through being contained in jar outlet, is delivered to the sludge dewatering operation by the outlet of slurry tank mud.
8, process for treating oil field sewage according to claim 1 is characterized in that: described strainer operation is provided with back flushing equipment.
9, process for treating oil field sewage according to claim 8 is characterized in that: backwashing water returns the oil removal by air bubbling operation again through the backwash tank access withdrawing can of filter operation.
CNB2007100644070A 2007-03-14 2007-03-14 Process for treating oil field sewage CN100569671C (en)

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中原油田注水水质改性技术. 纪云岭,张爱社,张丽,傅绍斌.油田化学,第20卷第1期. 2003 *

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