CN103936185A - Method for treating and reusing super-heavy oil high-temperature sewage in thermal recovery boiler - Google Patents
Method for treating and reusing super-heavy oil high-temperature sewage in thermal recovery boiler Download PDFInfo
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Abstract
The invention provides a method for treating and reusing super-heavy oil high-temperature sewage in a thermal recovery boiler. The method comprises the steps: adding an antiphase demulsifying agent into the super-heavy oil high-temperature sewage, removing high-content emulsified oil, then successively adding a high-efficiency purifying agent, a conditioning stabilizer and a coagulating agent in a cyclone reactor, removing oil and removing suspended solids, and carrying out sedimentation and solid-liquid separation; carrying out two-stage filtration to further remove fine suspended solids; after the super-heavy oil high-temperature sewage is subjected to purification and stabilization treatment, allowing the super-heavy oil high-temperature sewage to enter a two-stage ion exchanger, and carrying out softening treatment to reach water supply water quality standards of the thermal recovery boiler. The process makes full use of the temperature of the super-heavy oil high-temperature sewage, saves a large amount of energy, reduces consumption of a fuel of the thermal recovery boiler, achieves cyclic utilization of the super heavy oil sewage, saves clear water resources, and improves effects of energy saving and emission reduction and comprehensive economic benefits.
Description
Technical field
The present invention relates to the processing reuse of sewage, especially super Heavy Oil High Temperature waste water treating and reutilizing, the method is scientific and reasonable, and result of use is splendid.
Background technology
To the class definition of extraction crude oil, 50 DEG C time below viscosity < 1000mPa.s is thin oil, and between 1000～10000mPa.s is viscous crude, and 10000～50000mPa.s's is special viscous crude, and more than 50000mPa.s is super viscous crude.Super dense oil extraction wastewater is to contain the multi-component complex systems such as solid impurity, microorganism, gas dissolved and solubility salt, the feature that ubiquity organism kinds is assorted, salinity is high, oleaginousness is high, incrustation ion content is high.The feature of extremely-viscous crude sewage is " the high oil-containing high suspended matter of high temperature high-silicon type recovered water ", and the difficult point aspect purifying treatment: it is high that (1) deviates from sewage temperature, reaches 80～90 DEG C; (2) contain high-content colloid and bituminous matter and carry the suspended substances such as a large amount of silt; (3) conventional water purification agent at 80-90 DEG C because of molecular rupture or because of oil, suspended substance molecular motion is violent and ineffective.(4) although inorganic water purification agent heat resistance is better, and super dense oil extraction wastewater suspension content is too high, thus the solid-liquid separation efficiency of suspended substance generation great quantity of floc reduction equipment in inorganic water purification agent and water, and therefore result of use is poor.(5) in Produced Liquid is given rise to ground and dehydration, added a large amount of chemical agents, these medicaments remain among recovered water, make sewage form stable emulsion.This sewage not only oleaginousness is high, and super viscosity of thickened oil is large in addition, makes dirty water purification more complicated, and intractability is larger.The difficult point of super dense oil extraction wastewater aspect advanced treatment: what extremely-viscous crude sewage advanced treatment technology adopted is ion exchange technique, the hardness in water can be processed to 0.1mg/L(with CaCO
3meter) below, although reached the index request of injection boiler to hardness, SiO in super dense oil extraction wastewater
2mass concentration is at 200mg/L even more than 250mg/L, in water residual hardness and multivalent metal cation at high temperature with water in the silicon of the different shape formation silicate scale that reacts, if for there is steam in this sewage, will in thermal recovery boiler or steam injection pipeline, form silicon dirt, its hazardness is far away higher than calcium dirt.In the water-quality guideline of current reusing sewage injection boiler after treatment, require SiO
2mass concentration is below 100mg/L.Adopt lime or causticity tenderizer to process the SiO in super Heavy Oil High Temperature sewage
2all undesirable, because: 1. softening medicament dosage is large, produces a large amount of mud, has increased difficulty to sludge disposal.2. operating parameters complexity, medicament softening process, because multiple parameters may change, causes controlling difficulty large.3. technical process is long, and equipment increases.Medicine soften need to increase the process facility such as softening pond, silica removal pond, settling pond, need to increase various medicaments adding equipment.4. investment and processing cost are high.
Method provided by the invention; oil well is separated to excess of export Heavy Oil High Temperature sewage and carry out advanced treatment; its technique is the temperature that makes full use of super Heavy Oil High Temperature sewage; save thermal recovery boiler fuel consumption; implement the integrated disposal of multi-step, realize the utilization of super Heavy Oil High Temperature effluent cycle, saved clear water resource; protection of the environment, has significant economic benefit and good social benefit.
Summary of the invention
The object of the invention is to: for super Heavy Oil High Temperature waste water treating and reutilizing method, efficiently solve prior art production problem, reached the effect to super Heavy Oil High Temperature sewage disposal, for industry energy conservation consumption reduction has been made demonstration.
The object of the present invention is achieved like this: a kind of super Heavy Oil High Temperature waste water treating and reutilizing, in the method for thermal recovery boiler, is implemented step by step;
Step 1 adds reverse-phase emulsifier to the super Heavy Oil High Temperature sewage that is placed in separating tank, implements oily water separation, and dosage is 20-50mg/L;
Wherein reverse-phase emulsifier is made up of cation polyether quaternary ammonium salt, 3.0G polyamide-amide, nonionic polyoxyalkylene; Two kinds are mixed use ratio of mixture is 1:1-2:1, and three kinds are mixed use ratio of mixture is 1:2:1, and water oleaginousness after treatment is less than 5mg/L, suspended solids content is less than 10mg/L;
Step 1 water outlet is placed in Cyclonic reactor by step 2, adds successively scavenging agent, conditioning stablizer, flocculation agent, and wherein scavenging agent dosage is 100-200mg/L, and conditioning stablizer dosage is 50-100mg/L, and flocculation agent dosage is 6-10mg/L;
Wherein scavenging agent is made up of polymerize aluminum chloride, polyaluminium sulfate, polysilicic acid aluminum chloride, and two kinds are mixed use ratio of mixture is 1:1-2:1, and three kinds are mixed use ratio of mixture is 1:1:1;
Wherein nurse one's health stablizer and be made up of polyphosphoric acid salt, organophosphate, sodium hydroxide, two kinds are mixed use ratio of mixture is 1:20-1:25, and three kinds are mixed use ratio of mixture is 1:1:20-1:1:25;
Wherein flocculation agent is made up of anionic polyacrylamide, non-ionic polyacrylamide, and two kinds are mixed use ratio of mixture is 2:1-3:1; Negatively charged ion and non-ionic molecular weight ranges are 1,500 ten thousand-2,000 ten thousand;
Step 2 water outlet is placed in the sedimentation of inclined plate sedimentation tank by step 3, after buffering, pumps into one-level Double-filter material filter and secondary fine filter, removes surplus oil and suspended substance in water, and making its water outlet oleaginousness is 0mg/L, and suspended solids content is less than 2mg/L; Enter again in one-level sodium type cationic exchange softening agent and process, make total hardness≤0.1mg/L; Enter in secondary chelating ion exchange resin softening agent and process, make calcium ion, magnesium ion, iron ion content all≤0.02mg/L, can enter thermal recovery boiler reuse.
Described method, super viscosity of thickened oil >50000Mpa.s in the high temperature sewage of disposing, sewage temperature 85-90 DEG C, pH7.5-8.5, salinity 2000-4000mg/L, oleaginousness 10000-20000mg/L, suspended solids content 500-1000mg/L, hardness 40-80mg/L, dioxide-containing silica 200-250mg/L.
The mechanism of action of the present invention and usefulness: adopt the water quality of the method processing, reach China National Petroleum thermal recovery boiler to water quality standard--oilfield sewage reuse wet steam generator water quality standard (Q/sy1275-2010) requirement.This process using there is energy-saving and cost-reducing gravity-cyclone reaction-filtering process, and stable water quality and the water-quantity regulating device of shock resistance, softening water is processed and is used chelating ion exchange resin melded system, without silica removal processing, complicated operation, sludge quantity is large, processing costs is high chemical agent melded system are replaced, make operation more simple and convenient, a joint station daily means is processed the water yield 4.0 × 10
4m
3calculate, the totals 1139 × 10 such as crude oil clear water resource are reclaimed in saving heat energy (condensed oil sewage temperature, oil fuel) blowdown
5unit/year, show technical progress.
Brief description of the drawings
Below in conjunction with accompanying drawing, the invention is further described.
Accompanying drawing is super Heavy Oil High Temperature sewage treatment process figure;
As shown in the figure: sewage → regulating tank → reaction surge tank → Cyclonic reactor → inclined plate sedimentation tank → filtration surge tank → Double-filter material filter → fine filter → sodium type cationic exchange softening agent → chelating ion exchange resin softening agent → thermal recovery boiler.
Embodiment
Below in conjunction with embodiment, invention is further illustrated.
Embodiment 1
The super Heavy Oil High Temperature sewage in certain oil field, 90 DEG C of sewage temperatures, pH8.5, salinity 4000mg/L, oleaginousness 20000mg/L, suspended solids content 1000mg/L, hardness 80mg/L, dioxide-containing silica 250mg/L;
Treatment step:
1) in super Heavy Oil High Temperature sewage, add 50mg/L reverse-phase emulsifier, reverse-phase emulsifier is cation polyether quaternary ammonium salt, 3.0G polyamide-amide mixture, and its ratio of mixture is 1:1, adopts volume pump, and wet method adds;
2) add high-efficiency decontaminating agent 200mg/L to step 1) water, in special Cyclonic reactor, react, reaction times 45s, high-efficiency decontaminating agent is the mixture of polymerize aluminum chloride, polyaluminium sulfate, and its ratio of mixture is 2:1, adopts volume pump, and wet method adds;
3) to step 2) water adds conditioning stablizer 100mg/L, in special Cyclonic reactor, reacts, reaction times 47s, conditioning stablizer is polyphosphoric acid salt, organophosphate and sodium hydroxide mixture; Its ratio of mixture is 1:1:20, adopts volume pump, and wet method adds;
4) add flocculation agent 10mg/L to step 3) water, in special Cyclonic reactor, react, reaction times 60s, flocculation agent is the mixture of anionic polyacrylamide, non-ionic polyacrylamide, its ratio of mixture is 2:1, and molecular weight ranges is 1,500 ten thousand; Adopt volume pump, wet method adds;
5) by step 4) treated water, enter the sedimentation of inclined plate sedimentation tank, then in filtration surge tank, cushion, pump in one-level Double-filter material filter and secondary fine filter by lift pump, carry out two-stage filtration, remove surplus oil and suspended substance in water, making its water outlet oleaginousness is that 0mg/L, suspended solids content are less than 2mg/L; Enter one-level sodium type cationic exchange softening agent, make total hardness≤0.1mg/L; Enter in secondary chelating ion exchange resin softening agent, make calcium ion, magnesium ion, iron ion content all≤0.02mg/L; Enter thermal recovery boiler reuse.
Embodiment 2
The super Heavy Oil High Temperature sewage in certain oil field, sewage temperature is 85 DEG C, and pH is 7.5, and salinity is 2000mg/L, and oleaginousness is 10000mg/L, and suspended solids content is 500mg/L, and hardness is 40mg/L, and dioxide-containing silica is 200mg/L;
Treatment step:
1) in super Heavy Oil High Temperature sewage, add 20mg/L reverse-phase emulsifier; Reverse-phase emulsifier is 3.0G polyamide-amide, nonionic polyoxyalkylene mixture, and its ratio of mixture is 2:1, adopts volume pump, and wet method adds;
2) add high-efficiency decontaminating agent 100mg/L to step 1) water, in special Cyclonic reactor, react, reaction times 45s, high-efficiency decontaminating agent is the mixture in polyaluminium sulfate, poly-silicon aluminum chloride; Its ratio of mixture is 1:1, adopts volume pump, and wet method adds;
3) to step 2) water adds conditioning stablizer 50mg/L, in special Cyclonic reactor, reacts, reaction times 60s, conditioning stablizer is organophosphate, magnesium chloride mixture; Its ratio of mixture is 1:20, adopts volume pump, and wet method adds;
4) add flocculation agent 6mg/L to step 3) water, in special Cyclonic reactor, react, reaction times 48s, flocculation agent is the mixture of anionic polyacrylamide, non-ionic polyacrylamide, and its ratio of mixture is 3:1, and molecular weight ranges is 2,000 ten thousand; Adopt volume pump, wet method adds;
5) by step 4) treated water, to step 4 treated water, enter the sedimentation of inclined plate sedimentation tank, then in filtration surge tank, cushion, pump in one-level Double-filter material filter and secondary fine filter by lift pump, carry out two-stage filtration, remove surplus oil and suspended substance in water, making its water outlet oleaginousness is that 0mg/L, suspended solids content are less than 2mg/L; Enter one-level sodium type cationic exchange softening agent, make total hardness≤0.1mg/L; Enter in secondary chelating ion exchange resin softening agent, make calcium ion, magnesium ion, iron ion content all≤0.02mg/L; Enter thermal recovery boiler reuse.
Embodiment 3
The super Heavy Oil High Temperature sewage in certain oil field, sewage temperature is 90 DEG C, and pH is 8.0, and salinity is 3000mg/L, and oleaginousness is 15000mg/L, and suspended solids content is 800mg/L, and hardness is 60mg/L, and dioxide-containing silica is 220mg/L;
Treatment step:
1) in super Heavy Oil High Temperature sewage, add 30mg/L reverse-phase emulsifier; Reverse-phase emulsifier is cation polyether quaternary ammonium salt, 3.0G polyamide-amide, nonionic polyoxyalkylene mixture, and its ratio of mixture is 1:2:1, adopts volume pump, and wet method adds;
2) add high-efficiency decontaminating agent 150mg/L to step 1) water, in special Cyclonic reactor, react, reaction times 48s, high-efficiency decontaminating agent is mixture in polymerize aluminum chloride, polyaluminium sulfate, poly-silicon aluminum chloride; Its ratio of mixture is 1:1:1, adopts volume pump, and wet method adds;
3) to step 2) water adds conditioning stablizer 80mg/L, in special Cyclonic reactor, reacts, reaction times 49s, conditioning stablizer is the mixture of polyphosphoric acid salt, organophosphate, calcium hydroxide; Its ratio of mixture is 1:1:25, adopts volume pump, and wet method adds;
4) add flocculation agent 8mg/L to step 3) water, in special Cyclonic reactor, react, reaction times 60s, flocculation agent is the mixture of anionic polyacrylamide, non-ionic polyacrylamide, and its ratio of mixture is 3:1, and molecular weight ranges is 1,800 ten thousand; Adopt volume pump, wet method adds;
5) by step 4) treated water, enter the sedimentation of inclined plate sedimentation tank, then in filtration surge tank, cushion, pump in one-level Double-filter material filter and secondary fine filter by lift pump, carry out two-stage filtration, remove surplus oil and suspended substance in water, making its water outlet oleaginousness is that 0mg/L, suspended solids content are less than 2mg/L; Enter one-level sodium type cationic exchange softening agent, make total hardness≤0.1mg/L; Enter in secondary chelating ion exchange resin softening agent, make calcium ion, magnesium ion, iron ion content all≤0.02mg/L; Enter thermal recovery boiler reuse.
Adopt aforesaid method to process purifying waste water of obtaining, after measured, in water, oleaginousness is 0mg/L, suspended substance≤2mg/L, calcium ion, magnesium ion, iron ion content all≤0.02mg/L, without carrying out silica removal processing, reach the standard up to standard of answering that specifies feedwater in oilfield sewage reuse wet steam generator water quality standard (Q/sy1275-2010).
Three, production effect checking:
Purifying waste water that aforesaid method processing is obtained measured water-quality guideline in table 1, table 2.
Table 1 surpasses Heavy Oil High Temperature sewage disposal
Table 2 surpasses Heavy Oil High Temperature sewage disposal
Learnt by table 1, table 2 data: in water after treatment, oleaginousness is 0mg/L, suspended substance≤2mg/L, calcium ion, magnesium ion, iron ion content all≤0.02mg/L, without carrying out silica removal processing, reach in oilfield sewage reuse wet steam generator water quality standard (Q/sy1275-2010) the regulation standard that should reach that feeds water.
The manufacturer of one-level Double-filter material filter that the present invention selects, secondary fine filter, one-level sodium type cationic exchange softening agent, secondary chelating ion exchange resin softening agent is Oilfield Company.
The manufacturer of cation polyether quaternary ammonium salt that the present invention selects, 3.0G polyamide-amide, nonionic polyoxyalkylene, polymerize aluminum chloride, polyaluminium sulfate, poly-silicon aluminum chloride, polyphosphoric acid salt, organophosphate negatively charged ion, polyacrylamide, non-ionic polyacrylamide is that Karamay, Xinjiang three reaches chemical company of limited liability company.
Claims (2)
1. super Heavy Oil High Temperature waste water treating and reutilizing, in a method for thermal recovery boiler, is characterized in that: implement step by step;
Step 1 adds reverse-phase emulsifier to the super Heavy Oil High Temperature sewage that is placed in separating tank, implements oily water separation, and dosage is 20-50mg/L;
Wherein reverse-phase emulsifier is made up of cation polyether quaternary ammonium salt, 3.0G polyamide-amide, nonionic polyoxyalkylene; Two kinds are mixed use ratio of mixture is 1:1-2:1, and three kinds are mixed use ratio of mixture is 1:2:1, and water oleaginousness after treatment is less than 5mg/L, suspended solids content is less than 10mg/L;
Step 1 water outlet is placed in Cyclonic reactor by step 2, adds successively scavenging agent, conditioning stablizer, flocculation agent, and wherein scavenging agent dosage is 100-200mg/L, and conditioning stablizer dosage is 50-100mg/L, and flocculation agent dosage is 6-10mg/L;
Wherein scavenging agent is made up of polymerize aluminum chloride, polyaluminium sulfate, polysilicic acid aluminum chloride, and two kinds are mixed use ratio of mixture is 1:1-2:1, and three kinds are mixed use ratio of mixture is 1:1:1;
Wherein nurse one's health stablizer and be made up of polyphosphoric acid salt, organophosphate, sodium hydroxide, two kinds are mixed use ratio of mixture is 1:20-1:25, and three kinds are mixed use ratio of mixture is 1:1:20-1:1:25;
Wherein flocculation agent is made up of anionic polyacrylamide, non-ionic polyacrylamide, and two kinds are mixed use ratio of mixture is 2:1-3:1; Negatively charged ion and non-ionic molecular weight ranges are 1,500 ten thousand-2,000 ten thousand;
Step 2 water outlet is placed in the sedimentation of inclined plate sedimentation tank by step 3, after buffering, pumps into one-level Double-filter material filter and secondary fine filter, removes surplus oil and suspended substance in water, and making its water outlet oleaginousness is 0mg/L, and suspended solids content is less than 2mg/L; Enter again in one-level sodium type cationic exchange softening agent and process, make total hardness≤0.1mg/L; Enter in secondary chelating ion exchange resin softening agent and process, make calcium ion, magnesium ion, iron ion content all≤0.02mg/L, can enter thermal recovery boiler reuse.
2. method according to claim 1, it is characterized in that: super viscosity of thickened oil >50000Mpa.s in the high temperature sewage of disposing, sewage temperature 85-90 DEG C, pH 7.5-8.5, salinity 2000-4000 mg/L, oleaginousness 10000-20000 mg/L, suspended solids content 500-1000 mg/L, hardness 40-80mg/L, dioxide-containing silica 200-250mg/L.
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Cited By (5)
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| CN105152288A (en) * | 2015-07-09 | 2015-12-16 | 中国石油天然气股份有限公司 | Method for recycling steam-injection separated water of SAGD (steam assisted gravity drainage) |
| CN106007096A (en) * | 2016-07-15 | 2016-10-12 | 嘉兴通惠环保科技有限公司 | Pretreatment technology for textile machine cleaning high-oil-content waste liquor |
| CN107162154A (en) * | 2017-06-12 | 2017-09-15 | 中国矿业大学 | A kind of ternary composite flooding water extraction support type reverse-phase emulsifier and preparation method thereof |
| CN107795299A (en) * | 2016-08-30 | 2018-03-13 | 中国石油化工股份有限公司 | A kind of method that profit well acidizing returns discharge opeing recycling reuse |
| CN109628140A (en) * | 2018-12-29 | 2019-04-16 | 中海油天津化工研究设计院有限公司 | The preparation method of viscous crude oily waste water treatment rp demulsification water purification agent |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152288A (en) * | 2015-07-09 | 2015-12-16 | 中国石油天然气股份有限公司 | Method for recycling steam-injection separated water of SAGD (steam assisted gravity drainage) |
| CN106007096A (en) * | 2016-07-15 | 2016-10-12 | 嘉兴通惠环保科技有限公司 | Pretreatment technology for textile machine cleaning high-oil-content waste liquor |
| CN107795299A (en) * | 2016-08-30 | 2018-03-13 | 中国石油化工股份有限公司 | A kind of method that profit well acidizing returns discharge opeing recycling reuse |
| CN107795299B (en) * | 2016-08-30 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of method that grease well acidizing returns drain recycling reuse |
| CN107162154A (en) * | 2017-06-12 | 2017-09-15 | 中国矿业大学 | A kind of ternary composite flooding water extraction support type reverse-phase emulsifier and preparation method thereof |
| CN107162154B (en) * | 2017-06-12 | 2020-04-14 | 中国矿业大学 | Ternary combination flooding produced water load type reverse demulsifier and preparation method thereof |
| CN109628140A (en) * | 2018-12-29 | 2019-04-16 | 中海油天津化工研究设计院有限公司 | The preparation method of viscous crude oily waste water treatment rp demulsification water purification agent |
| CN109628140B (en) * | 2018-12-29 | 2021-08-10 | 中海油天津化工研究设计院有限公司 | Preparation method of reversed phase demulsification water purifier for treating heavy oil containing oily sewage |
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