CN109879472A - Drain processing method is returned in acidification - Google Patents
Drain processing method is returned in acidification Download PDFInfo
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- CN109879472A CN109879472A CN201910112902.7A CN201910112902A CN109879472A CN 109879472 A CN109879472 A CN 109879472A CN 201910112902 A CN201910112902 A CN 201910112902A CN 109879472 A CN109879472 A CN 109879472A
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Abstract
The invention discloses a kind of acidifications to return drain processing method, and steps are as follows: returning according to the dosage of 0.05~0.25g/L to acidification and puts into nano zero valence iron in drain and be uniformly mixed, 4~16h is reacted under the mixing speed of 40~100r/min；2~5h of natural subsidence is negated and is answered supernatant and adjust its pH to 6~9；The flocculation aid of coagulant and 1/30~1/6 times of coagulant weight is added into mixed liquor according to the dosage of 10~50mg/L, and is uniformly mixed；Under conditions of air bearing pressure is 0.1~0.5mPa, fixed reflux ratio is 25%, after carrying out 5~30min of air bearing reaction to mixed liquor, the suspended matter on mixed liquor surface is removed；Drain processing method is returned in the acidification makes the various organic pollutants in waste liquid obtain effective degradation, alleviate its bring environmental pollution, and treatment process is relatively simple, high treating effect, the degradation that pollutant in drain is returned in acidification is significantly promoted, there is important directive significance to the efficient degradation of environment especially field of petroleum exploitation persistent organic pollutants.
Description
Technical field
The present invention relates to Environment protection of oil field technical field, in particular to drain processing method is returned in a kind of acidification.
Background technique
In oilfield development process, it is the most commonly used increasing yield and injection means that oil-water well, which is carried out acidification, can release reservoir
Pollution, or even transformation oil-gas Layer, and then achieve the purpose that improve oil gas well production or intensified injection of wells.However, oil-water well is acidified
Drain is returned in the acidification that journey also produces a large amount of complicated components, mainly contains acidification oil, residual sour (HCl etc.), residual acidification addition
Agent (such as thickener, corrosion inhibiter, surfactant, clay stabilizer), discharge it will certainly water quality to surrounding, soil,
Earth's surface etc. causes environmental pollution.Therefore, for environmental angle, drain is returned to acidification during oil field is open and is efficiently located
Reason seems imperative.
Currently, it mainly includes flocculating setting, neutralization, Fe/C light electrolysis, oxidation, activated carbon adsorption that the processing of drain is returned in acidification
The methods of.Neutralization-coagulation process has the characteristics that process is simple, it is contemplated that the operating location dispersion of oil gas field is not concentrated, and is such as adopted
With moveable intermittent processing unit, then greatly reduce investment, while facilitating a variety of management, producing cost is low, and easily promoting makes
For each major oil and gas field.Oxidation-absorption method is not only easy to operate, saves money, but also improves treatment effect, reaches national dirty
Water discharge standard.Using color, taste, pH value and the suspended matter etc. of sewage sample after neutralization-coagulation-oxidation-absorption hybrid technique processing
Meet National Industrial sewage drainage standard, the technique to containing high concentration and be not easy oxidation of organic compounds oil gas field be acidified the row of returning
The improvement of liquid is particularly suitable.But the technique more has the removal effect of the pollutants such as oil, microorganism in fracturing outlet liquid
Limit.Neutralization-Fe/C light electrolysis-catalysis oxidation-active carbon adsorption it has been investigated that, treated, and sewage sample pH value etc. reaches row
Put standard.But since HCl content is higher in acidizing waste fluid, so that removal Cl- difficulty is larger, still need further to be studied.
Patent applied for CN2018112229240 is disclosed a kind of handled using reproducibility iron powder and is acidified the side for returning drain
0.05~0.25g grade, micron order or nanoscale reproducibility iron powder is added by returning to every liter of acidification in method in drain,
Make reproducibility iron powder and acidification return drain to be uniformly mixed and sufficiently react, then stands the reaction solution sufficiently obtained after reaction simultaneously
Except sub-cloud sludge dispoal is completed after natural subsidence, although COD removal rate, oil content removal rate and solid content removal rate point
Do not reach 78%, 80% and 76% or more, but it is still necessary to this method is further improved to obtain preferably processing effect
Rate.
Summary of the invention
It has both simple process, dosage consumption and the acidification of high treating effect the object of the present invention is to provide a kind of and returns at drain
Reason method.
For this purpose, technical solution of the present invention is as follows:
Drain processing method is returned in a kind of acidification, and steps are as follows:
S1, investment nano zero valence iron in drain is returned to acidification according to the dosage of 0.05~0.25g/L and is uniformly mixed, 40
4~16h is reacted under the mixing speed of~100r/min；
Then S2,2~5h of natural subsidence negate and answer supernatant and adjust its pH to 6~9, obtain mixed liquor I；
S3, coagulant and 1/30~1/6 times of coagulant weight is added into mixed liquor I according to the dosage of 10~50mg/L
The flocculation aid of amount, and be uniformly mixed, obtain mixed liquor I I；
S4, under conditions of air bearing pressure is 0.1~0.5mPa, fixed reflux ratio is 25%, gas is carried out to mixed liquor I I
5~30min of floating reaction, removes the suspended matter on mixed liquor surface.
In the processing method, it is difficult to degrade first in the strong reducing property removal acidification anti-drain of nano zero valence iron
Pollutant, such as halogenated hydrocarbons, the substance of Identification of Soluble Organic containing chlorine, organo-chlorine pesticide, organic dyestuff, various inorganic compounds, heavy metal
Ion etc., while the generation of the possible by-product with larger toxicity of chemical removal method can also be effectively reduced, it prevents
The generation of secondary environmental pollution.Nano zero valence iron can also directly be injected in contaminated aquifer, to the aquifer of pollution
In-situ immobilization is carried out, the in-situ immobilization for underground water pollutant is sought to a novelty and the approach of special efficacy；In addition, coagulation
Air-float technology is then using the effect of catching of charge neutrality, adsorption bridging and net to the fine suspension in waste water, such as oil tiny in waste water
Dirty particle and colloid carry out flocculation polymerization, then make wadding body and oil emulsion etc. be difficult to pass through precipitation and separation by dissolved air flotation device
Lighter suspended matter floats to the water surface with microbubble, and remaining pollutant can be in coagulation in nano zero valence iron treatment process
It is further removed in air-float technology, the final COD content for realizing acidification anti-drain, oil content, solid content obtain significantly
Abatement.
It is preferred that in step s 2, by the way that sodium hydrate regulator solution pH to 6~9 is added to reaction supernatant.
It is preferred that in step s3, in step s3, aluminum sulfate or aluminium polychloride and poly- third are added into mixed liquor I
After acrylamide, first quickly to stir 1~2min not less than the mixing speed of 200r/min, make coagulant and flocculation aid with mix
Liquid I, which comes into full contact with, to react, then mixes slowly 10~15min with the mixing speed no more than 60r/min, make coagulant and help
Solidifying agent continues to react with mixed liquor I, but the precipitating for not influencing to generate sinks down into container bottom naturally.
It is preferred that a most preferred embodiment in drain processing method is returned in the acidification are as follows: according to the dosage of 0.15g/L to acidification
It returns and puts into nano zero valence iron in drain and be uniformly mixed, react 12h under the mixing speed of 80r/min；Then natural subsidence 4,
It negates and answers supernatant and adjust its pH to 8；Aluminium polychloride and 1/ are added into mixed liquor according to the dosage of 10~50mg/L
The polyacrylamide of 15 times of coagulant weight, and 1min is first stirred quickly with the mixing speed of 200r/min, then with 40r/min
Mixing speed mix slowly 10min；Finally by mixed liquor in the condition that air bearing pressure is 0.4mPa, fixed reflux ratio is 25%
After lower air bearing reaction 15min, the suspended matter on mixed liquor surface is removed, that is, completes the processing of acidification anti-drain.
Compared with prior art, which, which returns drain processing method and return drain to acidification using nano zero valence iron, is handled
In the process, the various organic pollutants in waste liquid have obtained effective degradation, alleviate its bring environmental pollution, are oil gas field
The sustainable development of production industry provides powerful guarantee；In addition, the treatment process that the processing method is related to is relatively simple, processing
Effect is good, significantly promotes the degradation that pollutant in drain is returned in acidification, difficult to degrade organic to environment especially field of petroleum exploitation
The efficient degradation of pollutant has important directive significance.
Specific embodiment
The present invention is described further combined with specific embodiments below, but following embodiments absolutely not to the present invention have appoint
What is limited.
Embodiment 1
In reactor tank be added acidification return drain and the nanoscale reduced iron powder of 0.15g/L, be uniformly mixed after
The reaction of 12h, natural subsidence 4h are carried out under the mixing speed of 80r/min；Then, the pH for reacting supernatant is adjusted to 8, obtained
Mixed liquor I；Then, aluminium polychloride and polyacrylamide, aluminium polychloride are added into mixed liquor I according to the dosage of 30mg/L
Quality proportioning with polyacrylamide is 15:1, after the completion of addition, first quickly stirs (200r/min) 1min, then mix slowly
(60r/min) 10min, obtains mixed liquor I I；Finally to mixing under the conditions of air bearing pressure 0.4mPa and fixed reflux ratio 25%
Liquid II carries out air bearing and reacts 15min, and after removing solution surface suspended matter, acidification is returned drain processing and completed.
Embodiment 2
In reactor tank be added acidification return drain and the micron order reduced iron powder of 0.10g/L, be uniformly mixed after
The reaction of 10h, natural subsidence 3h are carried out under the mixing speed of 60r/min；Then, the pH for reacting supernatant is adjusted to 7, obtained
Mixed liquor I；Then, according to the aluminium polychloride of 20mg/L and polyacrylamide, the quality of aluminium polychloride and polyacrylamide
Proportion is 10:1, after the completion of addition, first quickly stirs (200r/min) 1min, then mix slowly (40r/min) 10min, obtains
Mixed liquor I I；Air bearing reaction finally is carried out to mixed liquor I I under the conditions of air bearing pressure 0.3mPa and fixed reflux ratio 25%
5min, after removing solution surface suspended matter, acidification is returned drain processing and is completed.
Embodiment 3
In reactor tank be added acidification return drain and the nanoscale reduced iron powder of 0.05g/L, be uniformly mixed after
The reaction of 16h, natural subsidence 5h are carried out under the mixing speed of 40r/min；Then, the pH for reacting supernatant is adjusted to 9, obtained
Mixed liquor I；Then, according to the aluminum sulfate of 10mg/L and polyacrylamide, the quality proportioning of aluminum sulfate and polyacrylamide is 6:
1, after the completion of addition, (200r/min) 1min is first quickly stirred, then mix slowly (50r/min) 10min, obtain mixed liquor I I；
Air bearing finally is carried out to mixed liquor I I under the conditions of air bearing pressure 0.5mPa and fixed reflux ratio 25% and reacts 10min, is removed molten
After liquid surfactant suspension object, acidification is returned drain processing and is completed.
Embodiment 4
In reactor tank be added acidification return drain and the nanoscale reduced iron powder of 0.25g/L, be uniformly mixed after
The reaction of 16h, natural subsidence 2h are carried out under the mixing speed of 100r/min；Then, the pH for reacting supernatant is adjusted to 6, obtained
To mixed liquor I；Then, the aluminium polychloride and polyacrylamide of 50mg/L, the matter of aluminium polychloride and polyacrylamide is added
Amount proportion is 30:1, after the completion of addition, first quickly stirring (200r/min) 2min, then (60r/min) 15min is mixed slowly, it obtains
To mixed liquor I I；Air bearing reaction finally is carried out to mixed liquor I I under the conditions of air bearing pressure 0.1mPa and fixed reflux ratio 25%
30min, after removing solution surface suspended matter, acidification is returned drain processing and is completed.
Acidification in Examples 1 to 4 returns drain and returns drain using identical acidification.According to professional standard, row is returned to acidification
COD, oil content and solid content in liquid and the supernatant liquor handled by Examples 1 to 4 are measured and calculate, and obtain
The removal rate to COD, oil content and solid content in acidification anti-drain of drain facture realization is returned using above-mentioned acidification.
Specific calculated result see the table below 1.
Table 1:
| Experimental example | COD content removal rate | Oil content removal rate | Solid content removal rate |
| Embodiment 1 | 98.6% | 98.9% | 95.6% |
| Embodiment 2 | 93.3% | 93.6% | 89.9% |
| Embodiment 3 | 95.1% | 94.5% | 90.1% |
| Embodiment 4 | 96.7% | 95.2% | 92.8% |
As it can be seen from table 1 acidification of the same race returns drain after Examples 1 to 4 is handled, during the pH that drain is returned in acidification tends to
Property, COD removal rate therein reaches 93.3% or more, can reach 98.6%；Oil content removal rate reaches 93.6% or more,
It can reach 98.9%；Solid content removal rate reaches 89.9% or more, can reach 95.6%；It can be seen that using the application's
The COD content, oil content, solid content that acidification returns drain processing method and acidification can be made to return drain are significantly cut down, i.e., in fact
So that the various organic pollutants in waste liquid has been obtained effective degradation, alleviates its bring environmental pollution, opened for oil gas field
The sustainable development for adopting industry provides powerful guarantee.
Claims (4)
1. drain processing method is returned in a kind of acidification, which is characterized in that steps are as follows:
S1, it returns to put into drain to acidification according to the dosage of 0.05~0.25g/L and nano zero valence iron and is uniformly mixed, 40~
4~16h is reacted under the mixing speed of 100r/min；
Then S2,2~5h of natural subsidence negate and answer supernatant and adjust its pH to 6~9, obtain mixed liquor I；
S3, aluminum sulfate or aluminium polychloride and 1/30~1/6 times is added into mixed liquor I according to the dosage of 10~50mg/L
The polyacrylamide of coagulant weight, and be uniformly mixed, obtain mixed liquor I I；
S4, under conditions of air bearing pressure is 0.1~0.5mPa, fixed reflux ratio is 25%, it is anti-that air bearing is carried out to mixed liquor I I
5~30min is answered, the suspended matter on mixed liquor surface is removed.
2. drain processing method is returned in acidification according to claim 1, which is characterized in that in step s 2, by reaction
Sodium hydrate regulator solution pH to 6~9 is added in supernatant.
3. drain processing method is returned in acidification according to claim 1, which is characterized in that in step s3, into mixed liquor I
After aluminum sulfate or aluminium polychloride and polyacrylamide is added, quickly stirred with the mixing speed not less than 200r/min first
1~2min, then 10~15min is mixed slowly with the mixing speed no more than 60r/min.
4. drain processing method is returned in acidification according to claim 1, which is characterized in that specific steps are as follows: according to 0.15g/L
Dosage return to put into drain to acidification and nano zero valence iron and be uniformly mixed, react 12h under the mixing speed of 80r/min；So
Natural subsidence 4 afterwards negate and answer supernatant and adjust its pH to 8；Polymerization is added into mixed liquor according to the dosage of 10~50mg/L
The polyacrylamide of aluminium chloride and 1/15 times of coagulant weight, and first quickly stirred with the mixing speed of 200r/min
1min, then 10min is mixed slowly with the mixing speed of 40r/min；Finally mixed liquor is 0.4mPa, fixed back in air bearing pressure
After 15min is reacted in air bearing under conditions of stream ratio is 25%, the suspended matter on mixed liquor surface is removed, that is, completes the place for being acidified anti-drain
Reason.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910112902.7A CN109879472A (en) | 2019-02-13 | 2019-02-13 | Drain processing method is returned in acidification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910112902.7A CN109879472A (en) | 2019-02-13 | 2019-02-13 | Drain processing method is returned in acidification |
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| CN109879472A true CN109879472A (en) | 2019-06-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277081A (en) * | 2013-05-29 | 2013-09-04 | 北京惠博普能源技术有限责任公司 | Treatment process and device for oil-water well fractured and acidified flowback liquid |
| CN104628185A (en) * | 2015-01-26 | 2015-05-20 | 许丽萍 | Oil and gas field fracturing flow-back fluid treatment process |
| CN105060555A (en) * | 2015-07-29 | 2015-11-18 | 中国石油化工股份有限公司 | Online reusing and processing technology of water well acidified flowback fluid |
| CN107055855A (en) * | 2016-12-30 | 2017-08-18 | 陕西海默油田服务有限公司 | A kind of oil-gas field fracturing returns discharge opeing processing method |
| CN109209268A (en) * | 2018-10-19 | 2019-01-15 | 中国石油集团渤海钻探工程有限公司 | The method that drain is returned in acidification is handled using reproducibility iron powder |
-
2019
- 2019-02-13 CN CN201910112902.7A patent/CN109879472A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277081A (en) * | 2013-05-29 | 2013-09-04 | 北京惠博普能源技术有限责任公司 | Treatment process and device for oil-water well fractured and acidified flowback liquid |
| CN104628185A (en) * | 2015-01-26 | 2015-05-20 | 许丽萍 | Oil and gas field fracturing flow-back fluid treatment process |
| CN105060555A (en) * | 2015-07-29 | 2015-11-18 | 中国石油化工股份有限公司 | Online reusing and processing technology of water well acidified flowback fluid |
| CN107055855A (en) * | 2016-12-30 | 2017-08-18 | 陕西海默油田服务有限公司 | A kind of oil-gas field fracturing returns discharge opeing processing method |
| CN109209268A (en) * | 2018-10-19 | 2019-01-15 | 中国石油集团渤海钻探工程有限公司 | The method that drain is returned in acidification is handled using reproducibility iron powder |
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Application publication date: 20190614 |