CN101786769A - Treatment process for sewage in oil field - Google Patents
Treatment process for sewage in oil field Download PDFInfo
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- CN101786769A CN101786769A CN201010121613A CN201010121613A CN101786769A CN 101786769 A CN101786769 A CN 101786769A CN 201010121613 A CN201010121613 A CN 201010121613A CN 201010121613 A CN201010121613 A CN 201010121613A CN 101786769 A CN101786769 A CN 101786769A
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Abstract
The invention relates to a treatment process for sewage in an oil field. In the treatment process, (a) the sewage to be treated is electrolyzed by an electrocoagulation device, and impurities and moisture content are removed by floatation sewage disposal and sedimentation sewage disposal; (b) the treatment agent is filled in the sewage treated by the electrocoagulation device, and the mixture is intensively mixed in a mixing device; (c) the sewage after the filled treatment agent is mixed enters an efficient activated sludge water purifier for reaction to form activated sludge, and then the activated sludge is filtered furthermore. The invention adopts the oxidation-flocculation+ efficient activated sludge water purification technology to treat the sewage in the oil field, thereby not only reducing the dosage of the water-treatment chemical agent, but also avoiding the water quality eutrophication of formation water.
Description
Technical field
The present invention relates to a kind of sewage treatment process, specifically be meant a kind of treatment process for sewage in oil field flow process.
Background technology
Current disposing polluted water in oil is commonly used two kinds of methods: a kind of is to take the treatment process that traditional gravity floatation+coagulant precipitation+filtering under pressure+the corrosion-mitigation scale-inhibition medicament adds, this technology is by gravity natural subsidence and aeration flotation, preliminary bigger suspended substance and the free oil of proportion of removing, add coagulated agent then, make suspended substance in conjunction with forming the difference in specific gravity that big flocs unit increases suspended substance and water, reach and quicken suspended particle and the isolating purpose of sewage, by the cascade filtration technology, further reduce suspended substance and oil-contg in the water outlet at last.And for burn into fouling and the problem of bacteria of injecting water, then solve by adding a certain amount of inhibiter, scale inhibitor and sterilant.
This traditional treatment process that gravity floatation+coagulant precipitation+filtering under pressure+the corrosion-mitigation scale-inhibition medicament adds need be controlled water quality by adding expensive chemical agent in a large number, production cost is high, and add chemical agent general only in the early stage effect relatively good, As time goes on, bacterium in the water produces resistance, the treatment effect of medicament reduces greatly, add simultaneously nutritive elements such as generally containing organophosphorus in the chemical agent for a long time, cause the eutrophication of bottom water quality, make bacterium breed in a large number, the fouling of waterflood system, problems such as corrosion will come out again, need constantly to screen again the chemical agent of compatibility; This technology is also relatively poor for the higher water quality adaptability of sulfur-bearing, iron content, can not effectively remove these harmful ions, has aggravated the corrosion of waterflood system pipe-line equipment.
Another is the water quality modification technology, promptly with white lime Ca (OH)
2For mainly adding medicament, sewage PH is promoted to about 8.5, remove the CO in the sewage
3 2-, HCO
3 -, iron ion, S
2-And prevent from the corrosive purpose to be aided with polymeric flocculant and water quality stabilizer simultaneously, remove mechanical impurity and oil, play the purpose of purification and stable effluent quality.
The water quality modification technology has solved the etching problem of waterflood system substantially owing to promoted the pH value of sewage, but owing to has added a large amount of Ca (OH)
2, the Ca of supersaturation concentration in the water
2+Very easily fouling causes obstructions such as waterflood system pipeline, and can cause the immediate vicinity of wellbore reservoir choke after injecting the stratum, and reservoir permeability is reduced day by day, and the water-retaining capacity of water injection well descends, and directly has influence on production of hydrocarbons.And Ca (OH)
2Add in a large number, brought a large amount of insoluble solids in the feedwater, simultaneously, increasing substantially of system's pH value, form precipitation also for the part high valence ion condition is provided, formed a large amount of mud, not only bring immense pressure to environmental protection, surrounding enviroment are caused certain injury, and produce high sludge treatment expense.
Summary of the invention
Technical problem to be solved by this invention provides a kind of treatment process for sewage in oil field, it adopts electrooxidation-flocculation+high-efficiency activated mud water purifying technology that oil field waste is handled, not only reduce the dosage of chemistry in water treatment medicament, and avoided local water water quality eutrophication.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of treatment process for sewage in oil field, it is characterized in that, and mainly may further comprise the steps:
(a) pending sewage is carried out electrolysis treatment by electric flocculation plant, and by flotation blowdown and precipitation blowdown with impurity and water sepn, removal;
(b) sewage after electric flocculation plant is handled adds by chemicals dosing plant and handles medicament and carry out thorough mixing in mixing device;
(c) add medicament and mixed sewage and enter high-efficiency activated mud water purifier and react the formation active sludge, further filtration treatment.
In the described step (a) sewage being carried out electrolysis treatment in electric flocculation plant further comprises:
(a.1) be provided with electrolyzer at described electric flocculation plant, equidistant parallel is arranged iron and graphite electrode plate in described electrolyzer, sewage through lift pump from storage tank with sewage transport to the electrolyzer of electric flocculation plant, carry out electrolytic oxidation, electrolytic reduction, electrofloatation and electrolytic flocculation through electrolyzer and handle;
(a.2) floating matter and the throw out to gained after the electrolysis treatment is disposed to waste oil receiving tank and sludge thickener respectively by flotation blowdown, precipitation drainage.
In the described step (b) electric flocculation plant being handled back sewage dosing combination treatment further comprises:
(b.1) adopt the sewage after middle water pump is handled step (a.1) to be delivered to the dosing mixing tank from middle water tank;
(b.2) adopt dosing pump in sewage, to add the medicament for preparing, and make medicament and sewage thorough mixing in mixing tank, in sewage, add to handle medicament and comprise and adopt dosing pump PH conditioning agent, water purification agent and flocculation agent thereof to be added the mixing tank respectively from the medicament preparing tank; Described PH conditioning agent is formulated by 9: 1 mass ratio by slaked lime and NaOH, and sewage PH value is adjusted to 7.0-7.5; Described water purification agent adopts wilkinite composite water purifying agent, dosage 30-50mg/L; Described flocculation agent adopts anionic and molecular weight at the high polymer polyacrylamide more than 1,000 ten thousand, and dosage is 5mg/L.
Carrying out filtration treatment by high-efficiency activated mud water purifier in the described step (c) further comprises:
(c.1) sewage transport after will handling in step (b.2) to efficient active sludge water purifier filters;
(c.2) mud discharging that sedimentation and filtration joint are held back is to sludge thickener;
(c.3) will handle the qualified water in back by the re-injection of re-injection water pump.
For can circular treatment to sludge discharged, be disposed to mud in the sludge thickener through after the sedimentation to described through step (a.2) and step (c.2), with fresh water pump supernatant liquor is returned in the sewage storage tank, and repeating step (a), step (b) and step (c) successively.
After being disposed to the mud process sedimentation in the sludge thickener, the employing sludge pump is with the extraction of bottom mud and carry out drying and other treatment.
To sum up, the invention has the beneficial effects as follows: adopt electrooxidation-flocculation+high-efficiency activated mud water purification technology to handle oilfield sewage, method by physics realizes purifying water, controlling the effect that burn into suppresses fouling, kill bacteria, reduce the dosage of chemistry in water treatment medicament, avoid local water water quality eutrophication, problems such as the resistance of bacterium improve the compatibleness of injecting water and local water, reduce water treatment running cost; Remove harmful ion such as iron, sulphur in the water simultaneously, avoided the variation of water quality in the injecting process, realize the stable of water quality.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
The present invention adopts electrooxidation-flocculation+high-efficiency activated mud water purifying technology that oil field waste is handled.
As shown in Figure 1, technical process of the present invention is as follows: the waste water storage tank comes water at first in lift pump is promoted to the built-in electrolyzer of electric flocculation apparatus, equidistant parallel is arranged iron and graphite electrode plate in the electrolyzer, unlike material battery lead plate ratio is determined according to parameters such as water quality sulphur and bacteria contents, sewage is electrolysis in electrolyzer, the oxygenizement that can produce electrolysis simultaneously, electrolytic reduction effect, electrofloatation effect, electrolytic flocculation effect.Thus, positively charged ion in the sewage such as H
+Obtain electronics at electrolyzer inner cathode annex and be reduced into hydrogen.Other metal ions K in all the other water
+, Na
+Owing in water, have its activity, still exist with ionic state.And have active negatively charged ion of electrolysis betatopic such as Cl in the sewage
-, OH
-Near the electrolyzer inner anode, lose electronics and be oxidized to Cl
2, O
2, the Cl of generation
2Extremely water-soluble formation ClO
-, a large amount of ClO
-Sewage is had powerful sterilization and disinfection effect, reduce the bacterium of removing in the water with this.A large amount of H in the anode and cathode generation
2And O
2, its bubble is little, and the dispersity height adheres to lightweight oil in the water and suspended substance and floats as carrier, effluxes through overflow groove, reaches the effect of oil removing.Simultaneously owing to soluble metal electrolysis in the electrolytic process produces a large amount of positively charged ions, with the OH in the water
-Effect forms metal hydroxides colloid flocculation agent and provides favourable condition with adsorption precipitation of pollutants in waste water matter or formation larger particles for subsequent disposal.
Waste water after electrooxidation-flocculation treatment is through adding the PH conditioning agent, PH is adjusted to 7.0-7.5 after, described PH conditioning agent adopts slaked lime and NaOH to prepare in 9: 1 ratio, dosage is according to sewage PH dynamic adjustments, the Fe in the water
2+S in ion and the water
2-Precipitate in conjunction with generating FeS, add a spot of water purification agent and coagulant aids again, described water purification agent adopts the wilkinite composite water purifying agent, dosage 30-50mg/L, volume pump quantitatively adds, described coagulant aids adopts high polymer polyacrylamide, anionic, molecular weight is more than 1,000 ten thousand, dosage 5mg/L, volume pump quantitatively adds, the flco rapid subsidence forms high-efficiency activated mud filtering layer after making waste water enter high-efficiency activated mud water purifier, this filtering layer is by surface physics absorption, net is caught the effect of effect and electrochemical properties and Van der Waals force, with the suspensoid particle, flco, part bacterium thalline or the like impurity all interception makes effluent quality reach processing requirements on this high-efficiency activated mud filtering layer.
The effluent quality index that this technology is handled oil field waste can reach China National Petroleum industry standard " petroclastic rock reservoir water water-quality guideline and analytical procedure " water filling proposed standard (SY/T5329-94):
| Sequence number | Project | Index | Sequence number | Project | Index |
| ??1 | The total intermediate value of suspended particle particle diameter, μ m | ??≤5.0 | ??7 | Average corrosion rate, mm/a | ??0.076 |
| ??2 | The suspended substance solids content, mg/L | ??≤5.0 | ??8 | Sulfide content, mg/L | ??2.0 |
| ??3 | Dissolved oxygen content, mg/L | ??≤0.3 | ??9 | The SRB bacterium, individual/mL | ??≤100 |
| Sequence number | Project | Index | Sequence number | Project | Index |
| ??4 | Oleaginousness, mg/L | ??≤10.0 | ??10 | TGB, individual/mL | ??≤100 |
| ??5 | Total iron, mg/L | ??≤1.0 | ??11 | ??CO 2，mg/L | ??/ |
| ??6 | PH value | ??7.5 | ??12 | The fouling rate, mm/a | ??/ |
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, to any simple modification, equivalent variations that above embodiment did, all falls within protection scope of the present invention on every foundation technical spirit of the present invention.
Claims (9)
1. a treatment process for sewage in oil field is characterized in that, mainly may further comprise the steps:
(a) pending sewage is carried out electrolysis treatment by electric flocculation plant, and by flotation blowdown and precipitation blowdown with impurity and water sepn, removal;
(b) sewage after electric flocculation plant is handled adds by chemicals dosing plant and handles medicament and carry out thorough mixing in mixing device;
(c) add medicament and mixed sewage and enter high-efficiency activated mud water purifier and react the formation active sludge, further filtration treatment.
2. a kind of treatment process for sewage in oil field according to claim 1 is characterized in that, in the described step (a) sewage is carried out electrolysis treatment in electric flocculation plant and further comprises:
(a.1) be provided with electrolyzer at described electric flocculation plant, sewage through lift pump from storage tank with sewage transport to the electrolyzer of electric flocculation plant, carry out electrolytic oxidation, electrolytic reduction, electrofloatation and electrolytic flocculation through electrolyzer and handle;
(a.2) floating matter and the throw out to gained after the electrolysis treatment is disposed to waste oil receiving tank and sludge thickener respectively by flotation blowdown, precipitation drainage.
3. a kind of treatment process for sewage in oil field according to claim 2 is characterized in that, in described step (a.1), equidistant parallel is arranged iron and graphite electrode plate in described electrolyzer.
4. according to claim 2 or 3 described a kind of treatment process for sewage in oil field, it is characterized in that, in the described step (b) electric flocculation plant handled back sewage dosing combination treatment and further comprise:
(b.1) adopt the sewage after middle water pump is handled step (a.1) to be delivered to the dosing mixing tank from middle water tank;
(b.2) adopt dosing pump in sewage, to add the medicament for preparing, and make medicament and sewage thorough mixing in mixing tank.
5. a kind of treatment process for sewage in oil field according to claim 4, it is characterized in that, in described step (b.2), in sewage, add to handle medicament and comprise and adopt dosing pump PH conditioning agent, water purification agent and flocculation agent thereof to be added the mixing tank respectively from the medicament preparing tank.
6. a kind of treatment process for sewage in oil field according to claim 5 is characterized in that, described PH conditioning agent is formulated by 9: 1 mass ratio by slaked lime and NaOH, and sewage PH value is adjusted to 7.0-7.5; Described water purification agent adopts wilkinite composite water purifying agent, dosage 30-50mg/L; Described flocculation agent adopts anionic and molecular weight at the high polymer polyacrylamide more than 1,000 ten thousand, and dosage is 5mg/L.
7. a kind of treatment process for sewage in oil field according to claim 6 is characterized in that, carries out filtration treatment by high-efficiency activated mud water purifier in the described step (c) and further comprises:
(c.1) sewage transport after will handling in step (b.2) to efficient active sludge water purifier filters;
(c.2) mud discharging that sedimentation and filtration joint are held back is to sludge thickener;
(c.3) will handle the qualified water in back by the re-injection of re-injection water pump.
8. a kind of treatment process for sewage in oil field according to claim 7, it is characterized in that, be disposed to mud in the sludge thickener through after the sedimentation to described through step (a.2) and step (c.2), with fresh water pump supernatant liquor is returned in the sewage storage tank, and repeating step (a), step (b) and step (c) successively.
9. a kind of treatment process for sewage in oil field according to claim 8 is characterized in that, after being disposed to the mud process sedimentation in the sludge thickener, the employing sludge pump is with the extraction of bottom mud and carry out drying and other treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010121613A CN101786769A (en) | 2010-03-10 | 2010-03-10 | Treatment process for sewage in oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010121613A CN101786769A (en) | 2010-03-10 | 2010-03-10 | Treatment process for sewage in oil field |
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|---|---|
| CN101786769A true CN101786769A (en) | 2010-07-28 |
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ID=42530170
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|---|---|---|---|
| CN201010121613A Pending CN101786769A (en) | 2010-03-10 | 2010-03-10 | Treatment process for sewage in oil field |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102180566A (en) * | 2011-03-19 | 2011-09-14 | 汤苏云 | Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water |
| CN102863097A (en) * | 2012-09-14 | 2013-01-09 | 濮阳市天地人环保工程技术有限公司 | Standardized treatment reinjection method of sulfur-containing waste liquid of high sulfur-containing oil and gas field |
| CN105461121A (en) * | 2015-11-25 | 2016-04-06 | 克拉玛依市三达新技术股份有限公司 | Electrocoagulation treatment method of wastewater from oil-field work |
| CN107010755A (en) * | 2017-04-18 | 2017-08-04 | 中国石油大学(华东) | Tank fire reveals Oil Recovery and fire-fighting water circulation utilization system |
| CN107082474A (en) * | 2017-05-12 | 2017-08-22 | 中国石油大学(华东) | Leakage oil pollution soil and the quick repair system of underground water based on electric flocculation technique |
| CN108164095A (en) * | 2018-01-16 | 2018-06-15 | 中冶华天南京工程技术有限公司 | A kind of technique and device for handling condensed oil sewage |
| CN108674838A (en) * | 2018-03-16 | 2018-10-19 | 济南瑞东实业有限公司 | Storage tank comprehensive management of environmental protection device and administering method |
| CN110642334A (en) * | 2019-09-27 | 2020-01-03 | 北京帝力伟业科技开发有限公司 | Electrochemical treatment system and method for high-viscosity fracturing flow-back fluid |
| CN115403193A (en) * | 2021-05-27 | 2022-11-29 | 中国石油天然气股份有限公司 | High-efficiency oil field sewage treatment device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102180566A (en) * | 2011-03-19 | 2011-09-14 | 汤苏云 | Process method for combining physical-chemical treatment and biochemical treatment for reinjection water with oil-field produced water |
| CN102863097A (en) * | 2012-09-14 | 2013-01-09 | 濮阳市天地人环保工程技术有限公司 | Standardized treatment reinjection method of sulfur-containing waste liquid of high sulfur-containing oil and gas field |
| CN102863097B (en) * | 2012-09-14 | 2013-09-11 | 濮阳市天地人环保工程技术有限公司 | Standardized treatment reinjection method of sulfur-containing waste liquid of high sulfur-containing oil and gas field |
| CN105461121A (en) * | 2015-11-25 | 2016-04-06 | 克拉玛依市三达新技术股份有限公司 | Electrocoagulation treatment method of wastewater from oil-field work |
| CN107010755A (en) * | 2017-04-18 | 2017-08-04 | 中国石油大学(华东) | Tank fire reveals Oil Recovery and fire-fighting water circulation utilization system |
| CN107082474A (en) * | 2017-05-12 | 2017-08-22 | 中国石油大学(华东) | Leakage oil pollution soil and the quick repair system of underground water based on electric flocculation technique |
| CN108164095A (en) * | 2018-01-16 | 2018-06-15 | 中冶华天南京工程技术有限公司 | A kind of technique and device for handling condensed oil sewage |
| CN108164095B (en) * | 2018-01-16 | 2021-04-09 | 中冶华天南京工程技术有限公司 | Process and device for treating thick oil sewage |
| CN108674838A (en) * | 2018-03-16 | 2018-10-19 | 济南瑞东实业有限公司 | Storage tank comprehensive management of environmental protection device and administering method |
| CN110642334A (en) * | 2019-09-27 | 2020-01-03 | 北京帝力伟业科技开发有限公司 | Electrochemical treatment system and method for high-viscosity fracturing flow-back fluid |
| CN115403193A (en) * | 2021-05-27 | 2022-11-29 | 中国石油天然气股份有限公司 | High-efficiency oil field sewage treatment device |
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Application publication date: 20100728 |