CN1179891C - Process for treating oil field sewage - Google Patents
Process for treating oil field sewage Download PDFInfo
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- CN1179891C CN1179891C CNB01118163XA CN01118163A CN1179891C CN 1179891 C CN1179891 C CN 1179891C CN B01118163X A CNB01118163X A CN B01118163XA CN 01118163 A CN01118163 A CN 01118163A CN 1179891 C CN1179891 C CN 1179891C
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- sewage
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- zinc
- inorganic salt
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Abstract
The present invention relates to a method for processing oil field sewage. The present invention is characterized in that a composite ion regulating agent comprising magnesium and zinc inorganic salt, high molecular polymers and alkali compounds is added in the sewage, and the composite ion regulating agent reacts with the sewage in a multifunctional reactor; the water can enter a water injection system via deposition filtration, be discharged or return a thermal recovery boiler after being softened. The method of the present invention greatly reduces lime consumption, has good processing effects, reduces sludge generation amount in processing processes, enlarges sewage processing range and can process the oil field sewage with low mineralization degree, high temperature and low temperature.
Description
Technical field
The invention belongs to the oil-field development technical field, a kind of oil field of more specifically saying so produces the treatment process of sewage.
Background technology
Want simultaneously the output oily(waste)water in oilfield development process, these sewage must could further use through further handling.At publication number is to propose a kind of " oilfield injection water treatment method " in the patent application of CN1175657A, it to the effect that adds in sewage handles based on the treatment agent of calcium hydroxide, pass through certain treatment scheme again, the sewage after will handling at last injects the oilbearing stratum displacement of reservoir oil.This method has treatment effect preferably, but also come with some shortcomings: calcium hydroxide consumption (360-560mg/l sewage) bigger than normal, produce more mud, cause the inclined tube in the slurry tank to stop up, sewage disposal can not normally be carried out, and the mud of slurry tank inner bottom part is difficult to outside the drain tank; In addition, this method is not suitable for the processing of the oilfield sewage of low mineralization (as less than 10000mg/l sewage), and the output sewage treatment effect that is lower than 25 ℃ for temperature is also bad.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, propose a kind of process for treating oil field sewage with better purification and stabilising effect.
Main technical schemes of the present invention: be that the water conditioner composition is injected into respectively in a kind of multifunctional reactor, under certain mixture strength, react for some time, after sedimentation is filtered, enter injected system, or discharging, or after softening, enter thermal recovery boiler again.
The prescription of the water conditioner that the present invention is used and add-on thereof: the A composition is a 0-450mg/l sewage, and the B composition is a 0-250mg/l sewage, and the C composition is a 0.1-15mg/l sewage.
Described A composition is the inorganic salt of magnesium or zinc, comprises one or both mixtures in sal epsom, zinc sulfate, magnesium chloride, the zinc chloride.
Described B composition comprises one or both mixtures in calcium hydroxide, magnesium hydroxide, sodium hydroxide, the yellow soda ash.
Described C composition comprises the non-ionic type of polyacrylamide, the high molecular polymer of cationic or anionic, and molecular weight is general more than 1,000 ten thousand.
Process for treating oil field sewage of the present invention may further comprise the steps:
(1) in multifunctional reactor under the 0.8-1.5m/s stirring velocity, in sewage, add the A composition successively, reaction 20-100 second; Add the B composition again, react 20-100 second; Add the C composition at last, react 20-200 second; Sewage after the processing is through sedimentation 2-4 minute, gets to send into waterflood system behind its supernatant liquid filtering and be used for the oilbearing stratum displacement of reservoir oil, or discharging, or again through softening back input thermal recovery boiler.For described A composition and B composition, or add any, or the both adds, but can not add.Described A composition can add in the Reactor inlet pipeline.
Multifunctional reactor of the present invention is a known product, is that the JS-I type multifunctional reactor for the production of realification worker company limited is thought in Jing Zhou.
Sewage after the described processing adopts conventional strong acid ion exchange resin to soften processing before sending into thermal recovery boiler.
Advantage of the present invention:
The present invention is owing to adopt water conditioner to adjust agent and multifunctional reactor, therefore can significantly reduce the usage quantity of lime, treatment effect is better, generally speaking, the water quality of reactor outlet is up to standard substantially, and near zero, COD is less than 120mg/l as oil-contg, suspended solids is less than 5mg/l, and the sludge quantity that produces in the reduction treating processes; Method of the present invention enlarges the scope of disposing of sewage, and can handle the oil field output sewage of low mineralization, comprises condensed oil sewage, and can handle the sewage of high temperature and low temperature (being lower than 21 ℃) output; The present invention can hold back the above mud of 90% in the sewage owing to adopt multifunctional reactor, makes that sludge quantity is controlled at about 0.0005% in the outlet sewage, solve the slurry tank bottom discharge mud difficult and jar in an inclined tube blocking problem.
Embodiment
Further specify characteristics of the present invention below by concrete example.
Example 1
Get output sewage sample 1000ml at certain oilfield sewage station, sewage salinity is that 4164.5mg/l, oil-contg are 450mg/l, and on-line velocity is that adding concentration was 5% water conditioner B component (Ca (OH) under 1.0m/s stirred
2: the NaOH weight ratio is 1: 1) 4.0ml, at interval adding concentration in 35 seconds is 1% cationic polyacrylamide 1.0ml, continues to stir after 40 seconds sedimentation and leaves standstill 2 minutes.Get supernatant liquid and carry out the mensuration of every water-quality guideline, measurement result sees Table 1.As shown in Table 1, method of the present invention can reduce the add-on of dosing total amount and calcium hydroxide.
Example 2
Get output sewage sample 1000ml at certain oilfield sewage station, sewage temperature is 19 ℃, and oil-contg is 150mg/l, and under the stirring velocity of 1.5m/s, adding concentration is 5% water conditioner component A (Mg (OH)
2With ZnCl
2Weight ratio is 1: 4) 4.0ml, stir after 40 minutes, adding concentration is 5%NaCO
32.5ml at interval adding concentration after 45 seconds is 1% cationic polyacrylamide 0.8ml, continues to stir after 60 seconds sedimentation and leaves standstill 4 minutes, gets the mensuration that supernatant liquid carries out every water-quality guideline, measurement result sees Table 2.As shown in Table 2, method of the present invention can be handled low temperature oil-contaminated water.
Example 3.
Get output sewage sample 1000ml at certain oilfield sewage station, sewage salinity is that 2580.1mg/l, oil-contg are 250mg/l, and under the stirring velocity of 1.2m/s, adding concentration is 5% water conditioner component A (Mgcl
2With ZnCl
2Weight ratio is 5: 2) 2.5ml, stir after 30 seconds, adding concentration is 5%NaCO
32.0ml at interval adding concentration after 25 seconds is 1% cationic polyacrylamide 1.0ml, continues to stir after 40 seconds sedimentation and leaves standstill 2 minutes.Get supernatant liquid and carry out the mensuration of every water-quality guideline, measurement result sees Table 3.As shown in Table 3, method of the present invention can be handled the oily(waste)water of the oil field output of low mineralization.
Example 4.
Get output sewage sample 1000ml at certain oilfield sewage station, sewage salinity is that 2830mg/l, oil-contg are 260mg/l, and under the 0.8m/s stirring velocity, adding concentration is 5% water conditioner component A (MgCl
2With ZnCl
2Weight ratio is 7: 1) 2.5ml, stirred 35 seconds, adding concentration is 5%NaCO
32.0ml adding concentration after 28 seconds at interval is 1% cationic polyacrylamide 0.8ml, sedimentation was left standstill 2 minutes after continuing to stir for 40 seconds, got supernatant liquid and carried out every water-quality guideline, and measurement result sees Table 4.As shown in Table 4, but the sewage reuse thermal recovery boiler after handling by method of the present invention.
Example 5
Get output sewage sample 1000ml at certain oilfield sewage station, sewage salinity is that 5510mg/l, oil-contg are 380mg/l, and under the stirring velocity of 1.2m/s, adding concentration is 5%MgSO
420ml stirred after 30 seconds, and adding concentration is 5%NaCO
33.0ml at interval adding concentration after 35 seconds is 1% cationic polyacrylamide 1.0ml, continues to stir after 40 seconds sedimentation and leaves standstill 2 minutes.Get supernatant liquid and carry out the mensuration of every water-quality guideline, measurement result sees Table 5.As shown in Table 5, the sewage allow compliance with emission standards of the inventive method processing.
Table 1
Project | Always add dose, mg/l | Ca(OH) 2Add-on, mg/l | Sludge quantity, mg/l |
CN1175657A | 400-600 | 360-560 | 500-700 |
The present invention | 210 | 100 | 200 |
Table 2
Project | Temperature, ℃ | PH value | Oil-contg, mg/l | Sulfide, mg/l | Total iron, mg/l | Suspended solid, mg/l | Erosion rate, mm/a |
Output sewage | 30-90 | 6.0 | 450 | 20 | 15 | 150 | 1.08 |
CN1175657A | 30-90 | 8.0 | 7.0 | 2.0 | 0.05 | 3.0 | 66 |
Low temperature output sewage | 18-25 | 7.0 | 150 | 11 | 10 | 189 | 0.46 |
The present invention | 18-25 | 7.3 | 1.0 | 1.4 | 0.03 | 2.5 | 0.038 |
Table 3
Project | Salinity, mg/l | PH value | Oil-contg, mg/l | Sulfide, mg/l | Total iron, mg/l | Amount of solid, mg/l | Corrosion, mm/a |
CN1175857A | 150000 | 6.0 | 4.0 | 2.0 | 0.04 | 3.0 | 0.058 |
The present invention | 2830 | 7.0 | 0 | 2.0 | 0.03 | 2.0 | 0.039 |
Table 4 unit: mg/l
Project | Total hardness | Oil-contg | Suspended substance | Total iron | Total alkalinity | Silicone content | The soluble solids amount |
The boiler inlet standard | <0.1 | 2.0 | 2.0 | <0.1 | <2000 | 50 | <8000 |
Measured value | 0 | 0 | 1.2 | 0.1 | 12.7 | 15 | 2830 |
Table 5
Project | PH value | COD,mg/l | Petroleum-type, mg/l | Suspended substance, mg/l |
Secondary standard | 6.5-8.5 | ≤120 | ≤10 | ≤200 |
Measured value | 8.1 | 116.5 | 3.5 | 5.1 |
Claims (4)
1. process for treating oil field sewage, it is characterized in that stirring linear velocity be under the condition of 0.8-1.5m/s, the magnesium that in the reactor that fills oilfield sewage, adds 0-450mg/l sewage successively, the zinc inorganic salt, react 20-100 second, the basic cpd that adds 0-250mg/l sewage again, react 20-100 second, the high molecular polymer that adds 0.1-15mg/l sewage at last reacts 20-200 second, the sewage sedimentation after processing 2-4 minute, get its supernatant liquor and send into waterflood system, or discharging, or with supernatant liquor input thermal recovery boiler after softening, for described magnesium, zinc inorganic salt and basic cpd, or add wherein any, or the both adds;
Described high molecular polymer comprises that the molecular weight of polyacrylamide is the non-ionic type more than 1,000 ten thousand, cationic or anionic high molecular polymer.
2. in accordance with the method for claim 1, it is characterized in that described magnesium, zinc inorganic salt comprise one or both mixtures in sal epsom, zinc sulfate, magnesium chloride, the zinc chloride.
3. in accordance with the method for claim 1, it is characterized in that described basic cpd comprises one or both mixtures in calcium hydroxide, sodium hydroxide, the yellow soda ash.
4. in accordance with the method for claim 1, it is characterized in that magnesium, zinc inorganic salt add in the Reactor inlet pipeline.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CNB01118163XA CN1179891C (en) | 2001-05-18 | 2001-05-18 | Process for treating oil field sewage |
Applications Claiming Priority (1)
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CNB01118163XA CN1179891C (en) | 2001-05-18 | 2001-05-18 | Process for treating oil field sewage |
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CN1320562A CN1320562A (en) | 2001-11-07 |
CN1179891C true CN1179891C (en) | 2004-12-15 |
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CNB01118163XA Expired - Fee Related CN1179891C (en) | 2001-05-18 | 2001-05-18 | Process for treating oil field sewage |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100467394C (en) * | 2007-03-19 | 2009-03-11 | 大庆石油学院 | Method for removing polyacrylamide and other organic matters in oilfield exploration water and electrochemical reactor |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100408486C (en) * | 2006-09-25 | 2008-08-06 | 哈尔滨工业大学 | Degrading and viscosity reducing process for sewage containing oil and polymer |
CN105731661A (en) * | 2014-12-10 | 2016-07-06 | 中国石油天然气股份有限公司 | Decalcifying agent and method for relieving scaling phenomenon in water |
CN104944629B (en) * | 2015-05-26 | 2017-03-22 | 山东大学 | Method for treating water-soluble polymer containing wastewater |
CN105366868A (en) * | 2015-12-14 | 2016-03-02 | 四川阳森石油技术有限公司 | Up-to-standard discharge treatment technology of drilling wastewater from oil and gas fields |
CN106442916B (en) * | 2016-10-28 | 2019-01-18 | 中国石油天然气股份有限公司 | Ion adjustment and water purification effect simulation experiment method for oilfield injection water treatment agent |
CN115637967A (en) * | 2021-07-20 | 2023-01-24 | 中国石油天然气股份有限公司 | Treatment agent for oilfield produced liquid and application of treatment agent in oilfield development |
-
2001
- 2001-05-18 CN CNB01118163XA patent/CN1179891C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100467394C (en) * | 2007-03-19 | 2009-03-11 | 大庆石油学院 | Method for removing polyacrylamide and other organic matters in oilfield exploration water and electrochemical reactor |
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CN1320562A (en) | 2001-11-07 |
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