CN1216751A - Coagulation method for treating oil prodn. waste water of oil field polymers - Google Patents
Coagulation method for treating oil prodn. waste water of oil field polymers Download PDFInfo
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- CN1216751A CN1216751A CN 98117994 CN98117994A CN1216751A CN 1216751 A CN1216751 A CN 1216751A CN 98117994 CN98117994 CN 98117994 CN 98117994 A CN98117994 A CN 98117994A CN 1216751 A CN1216751 A CN 1216751A
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Abstract
The present invention discloses a coagulation treatment method for treating oil-field polymer oil-production waste water and is characterized by utilizing the forced coagulation action of chemical preparation polymeric hydroxy-aluminium to organically combine three processes of breakdown emulsion, coagulation and reducing viscosity together so as to raise the oil-water separation quality and deoiling efficiency and solve the difficult problem of polymer oil-production waste water treatment. Said invention is simple in technological process, can use the existent conventional treatment system in oil field to implement the requirements for produced-water reinjection, so that it features high efficiency, economy and practicality.
Description
The present invention relates to a kind of technological method and processing condition of handling the field polymers oil extraction-generated waste water, belong to the technical matters and the Application Areas of water treatment.
As much as possible from oil reservoir extraction more the intensified oil reduction technology of multiresidue crude oil be the problem that petroleum industrial circle generally is concerned about, it is a kind of method of effective raising oil recovery that the polyacrylamide (HPAM) of partial hydrolysis is injected the oil reservoir of having exploited (being called polymkeric substance recovers the oil).Yet, also having produced a large amount of oil extraction waste waters---polymkeric substance oil extraction-generated waste water in the oil field simultaneously, this sewage not only contains pollutents such as a large amount of oil and suspended substance, but also contains a large amount of polyacrylamides.The main water-quality guideline of polymer flooding oil-extraction wastewater is as follows:
1. oleaginousness=1000～3000ppm;
2. suspended solids=100～200ppm
3. polyacrylamide (HPAM) content=500～700ppm;
4. pH value=8～9;
5. water temperature=35～45 ℃;
6. viscosity=1.0～3.2mPas.
The principal feature of field polymers oil extraction-generated waste water is: sewage quantity is big, sewage viscosity height, and the emulsifying stability of oil droplet and suspended solid is strong in the water.Its medium-high viscosity and strong emulsifying stability be it with other oil extraction-generated waste water different principal character, also be the major cause that this sewage is difficult to purifying treatment.Because contain a large amount of polyacrylamide (HPAM) in the polymkeric substance oil extraction-generated waste water, on the one hand, the water-soluble effect of HPAM linear polymeric has increased the viscosity of sewage, be unfavorable in the water that according to the Stokes formula particulate such as oil droplet separates; On the other hand, HPAM is by the adsorption group (CONH on its molecular chain
2) with water in oil droplet and the absorption of particle such as suspended solid, too much HPAM molecule is wrapped in particle surface, because charged group (COO-) the dissociating in water on the HPAM molecular chain, made on the particle surface band a large amount of negative charges, the charge potential and the intergranular electrostatic repulsion forces of particle surface have been increased, add-the hydrophilic water solvent of COO-group turns usefulness into, wrapped up one deck aquation shell again in the particle periphery that has a large amount of negative charges, particulate emulsifying stabilities such as oil droplet have so been strengthened in the water greatly, the actual dispersion agent that play a part of HPAM this moment, make tiny particles such as oil droplet be difficult to coalescent growing up, therefore be difficult to from water, separate.
Because the polymkeric substance oil recovery technique still belongs to the industrialness pilot test stage at home and abroad, a spot of polymer produced sewage and a large amount of water flood recovery (secondary oil recovery) sewage are mixed together and enter the combination treatment station and handle in the process of the test.Because diluting effect utilizes the existing conventional treatment scheme can realize handling the requirement of re-injection.And extensive polymer flooding engineering programming and be implemented in China and also still at the early-stage in the world, the oil extraction-generated waste water that contains HPAM still runs into first in China, and the processing of present polymer flooding oil-extraction wastewater still is in the scientific research stage.In view of the work progress of present polymer flooding, the technology and the technology of underground injection are finished, and the oily(waste)water of the part of extraction on the ground will directly have influence on the enforcement and the popularization of polymkeric substance oil recovery technique as can well not administering.Therefore, polymkeric substance oil extraction-generated waste water Processing Technology has become indispensable important subject in the tertiary oil recovery technology.
The main processing approach of polymkeric substance oil extraction-generated waste water generally has three: efflux after processing reaches emission standard; Processing is used as the re-injection water of water flooding recovery or pours into useless stratum after reaching certain standard; Preparation water as polymers soln.No matter that approach, the problem that at first needs to solve is the removal of oil.
At present, the most the most frequently used method of oil-contaminated water of oil field degreasing technique is the physics method, as gravity separation, filtration etc., mainly by the wet goods impurity in the effect removal water such as gravity, absorption or mechanical retention.From novel treatment equipment and development trend thereof newly developed and development; be nothing but by increasing difference in specific gravity, increase particle grain size, improving the process that means such as particulate separation condition are strengthened centrifugation, as air supporting, coarse, centrifugation, swash plate separation, fine filtering etc.The chemical coagulation treatment process also is the isolating means of a kind of reinforcement, by breakdown of emulsion, the cohesion of medicament, increases the particle diameter of olesome, is used for handling the oil in water emulsion that is difficult to gravity separation and tiny suspended solids, to improve oil removal efficiency.For the oil-contaminated water of oil field of complexity, simple physics method or chemical method all are difficult to economically sewage purification be meeted the requirements.Present situation and development trend from the oil-contaminated water of oil field processing technological flow; the general practice is that physics method and chemical method are organically combined now; with the physics method is main oil-water separation method; with chemical method as strengthening isolating means; adopt a series of treatment schemees such as chemical coagulation (coarse)---oily water separation---filtration; the suspended substance in the removal sewage and the oil of various forms, effluent quality can reach the requirement of re-injection water.And for character and the diverse polymkeric substance oil extraction-generated waste water of water flood recovery sewage, profit is difficult to separate can not play a role existing waste-oil scavenger effectively.Once the someone adopted multiple degreasing technique that the polymkeric substance oil extraction-generated waste water is handled research, produced little effect, and common coagulated agent treatment effect is undesirable.Therefore, after the polymer flooding oil-extraction engineering starts, the sewage works of conventional processing flow process will face new selection, establish new sewage works or set up some efficiently treatment facility the conventional processing flow process is transformed, this two aspect all needs to spend a large amount of funds.
The present invention is directed to the characteristics of polymkeric substance oil extraction-generated waste water, proposition is the enhanced coagulation technical matters of core with the medicament hydroxy aluminum, with breakdown of emulsion, cohesion and three technological processs of reduction viscosity organically combine, the disintegrate-quality and the oil removal efficiency (clearance of oil reaches more than 99.5%) of profit have been improved, it is low to have solved polymkeric substance oil extraction-generated waste water purification separation efficient, the difficult problem of weak effect, and the polymkeric substance oil extraction-generated waste water can reach the requirement (seeing accompanying drawing) of re-injection water after aforesaid method is handled, and can enter nearby to handle the resource of water supply of back oily(waste)water (purifying waste water) pipe network as senior middle school's pervious course injection well pattern.Because this flow process has just increased coagulating treatment technology on the basis of the existing treatment system (oily water separation-filtration) of joint station, therefore, only need the existing conventional treatment scheme is transformed a little or improved, just can handle the polymkeric substance oil extraction-generated waste water with existing sewage works, not only can save construction investment greatly, also lay a good foundation for the re-injection of polymer sewage or reuse.This method has stronger high efficiency, economy and suitability widely, and industrial applications and design are had practical value.
Treatment process of the present invention is made up of three processes.At first be breakdown of emulsion viscosity reduction process, in the field polymers oil extraction-generated waste water, add medicament hydroxy aluminum, (n under violent agitation condition
1=200～250rpm, t
1=1～2min) makes medicament and sewage short mix even, under the chemical action of medicament, the emulsifying stability of tiny oil droplet and suspended particle is destroyed in the sewage simultaneously, and chemical reaction takes place the HPAM in medicament and the sewage, destroy the linear structure of HPAM molecule, thereby reduce the viscosity of sewage.Be flocculation process then, (n under agitation condition slowly
2=40～60rpm, t
2Bridging reaction takes place in=10～15min) HPAM molecules under the medicament effect, generate to have the cancellated throw out in space, and with take off the steady mutual adsorption bridging of particles such as oil droplet and form big flocs unit.Be sepn process at last, flocs unit come-up and water sepn in water-and-oil separator, behind the static separation 30min, it is as clear as crystal that water quality becomes, the clearance of oil reaches more than 99.5%, some tiny flocs units are held back by follow-up sand filtration in the water-and-oil separator water outlet, and last water outlet can reach the requirement of oil field reinjection water.The dregs of fat that produce in the treating processes can be used as the fuel recovery utilization.HPAM concentration is when 60ppm is raised to 750ppm in the polymkeric substance oil extraction-generated waste water, and the optimal coagulant dose scope of medicament hydroxy aluminum is 25～125mg/L, and the medicament expense of ton water treatment is 0.4～1.9 yuan/m
3Water.
Description of drawings:
Accompanying drawing is handled the recovering process flow synoptic diagram for the polymkeric substance oil extraction-generated waste water, wherein:
1-polymkeric substance oil extraction-generated waste water 5-oily water separation
2-medicament hydroxy aluminum 6-sand filtration
3-mixing 7-handles back water (but re-injection water is made in reuse)
4-reacts the 8-dregs of fat (recyclable utilization)
Embodiment 1: the coagulating treatment of Daqing oil field oil extraction No.1 Factory polymkeric substance oil extraction-generated waste water
1. actual polymkeric substance oil extraction-generated waste water (HPAM=161.7ppm)
From present Daqing oil field polymer injection oil well (oil extraction No.1 Factory, north is-5 more-31) get extraction liquid, according to the chemical dehydration technology of present extraction liquid after heat (about 40 ℃), breakdown of emulsion (the about 10mg/L of de-emulsifier SP-169), oily water separation (static 20 minutes), actual polymkeric substance oil extraction-generated waste water.
2. lower concentration HPAM oily(waste)water (HPAM=67.75ppm)
Get 111 water mixing stations and return water mixing,, get lower concentration HPAM oily(waste)water sample with above-mentioned actual polymkeric substance oil extraction-generated waste water equal-volume mixed diluting.
3. high density HPAM oily(waste)water (HPAM=750.85ppm)
Daqing oil field polymer injection oil well (oil extraction No.1 Factory, north-5 are more-31) extraction liquid adds HPAM (M=7 * 10
6), be made into the extraction liquid that contains high density HPAM, after heat (about 40 ℃), breakdown of emulsion (the about 10mg/L of de-emulsifier SP-169), oily water separation (static 20 minutes), get high density HPAM oily(waste)water again.
In above-mentioned three kinds of polymkeric substance oil extraction-generated waste waters, add the medicament hydroxy aluminum respectively, (n under violent agitation condition
1=200rpm) allow medicament and sewage short mix 1min, (n under agitation condition slowly then
2=55rpm) react 10min, stop to stir, behind the static separation 30min, get the middle part clear liquid and carry out water quality analysis.The condition of water quality of various sewage and coagulating treatment effect are summarized in table 1.
Table 1 polymkeric substance oil extraction-generated waste water water quality and coagulating treatment effect table look-up
Embodiment 2: the recover the oil coagulating treatment of six factory's polymkeric substance oil extraction-generated waste waters of grand celebration
| Raw water quality | Best | Effluent quality after the oily water separation | ||||||||
| The test water sample | Water temperature ℃ | ?pH | Turbidity NTU | Oil ppm | ?HPAM ?ppm | The HPAM molecular weight | Dosage mg/L | Surplus turbid NTU | Oil ppm | ?HPAM ?ppm |
| Actual three adopt sewage | 36 | ?8～9 | ?549.5 | ?1613 | ?161.7 | ?37.5 | ?3.2 | ?24.88 | ?16.6 | |
| Lower concentration HPAM oily(waste)water | 38 | ?8～9 | ?153 | ?667.2 | ?67.75 | ?25 | ?4.0 | ?4.04 | ?14.95 | |
| High density HPAM oily(waste)water | 38 30 48 38 | ?8～9 ?8～9 ?8～9 ?8～9 | ?162 ?162 ?162 ?337.5 | ?726 ?726 ?726 ?647.73 | ?750.85 ?750.85 ?750.85 ?635.35 | 7,000,000 700 ten thousand 700 ten thousand 700 ten thousand | ?125 ?125 ?125 ?125 | ?7.2 ?24.5 ?9.1 ?3.4 | 0.39 0.66 does not detect 2.3 | ?17.70 ?39.15 ?39.7 ?22.1 |
Get the extraction liquid of different polymer concentrations from six factories, four ore deposits, 470 station polymer flooding oil-extraction wells (10-P183,8-P192,9-P193), after natural subsidence is separated, obtain the polymkeric substance oil extraction-generated waste water from the bottom.In above-mentioned three kinds of polymkeric substance oil extraction-generated waste waters, add the medicament hydroxy aluminum respectively, (n under violent agitation condition
1=250rpm) short mix 1min, (n under agitation condition slowly then
2=40rpm) react 10min, stop to stir, behind the static separation 30min, get the middle part clear liquid and carry out water quality analysis.The water quality situation and the coagulating treatment of three kinds of polymkeric substance oil extraction-generated waste water test water samples the results are shown in Table 2.
Table 2 polymkeric substance individual well extraction liquid sewage quality and coagulating treatment result
| Extraction liquid sampling pound sign | The test sample numbering | Dosage (mg/L) | Settling time (min) | Oil length in the water (mg/L) | Polymer content (ppm) | The pH value | Viscosity (mPa.s) | Salinity (mg/L) |
| ?10-P183 | ????01 | ????0.00 | ????7212.70 | ????168.8 | ?7～8 | ????1.2 | ?3741.7 | |
| ?10-P183 | ????1 | ????62.5 | ????20 | ????21.91 | ????80.4 | ?7～8 | ????1.0 | ?3722.1 |
| ?10-P183 | ????2 | ????50.0 | ????20 | ????4.95 | ????91.2 | ?7～8 | ????1.0 | ?3750.1 |
| ?10-P183 | ????3 | ????37.5 | ????20 | ????37.88 | ????110.8 | ?7～8 | ????1.0 | ?4145.4 |
| ?8-P192 | ????02 | ????0.00 | ????2653.23 | ????80.2 | ?7～8 | ????1.4 | ?4083.0 | |
| ?8-P192 | ????4 | ????50.0 | ????20 | ????4.04 | ????40.2 | ?7～8 | ????1.0 | ?3906.0 |
| ?8-P192 | ????5 | ????37.5 | ????20 | ????13.28 | ????30.2 | ?7～8 | ????1.0 | ?3920.0 |
| ?8-P192 | ????6 | ????25.0 | ????20 | ????12.92 | ????20.4 | ?7～8 | ????1.0 | ?4078.0 |
| ?9-P193 | ????03 | ????0.00 | ????5009.05 | ????30.4 | ?7～8 | ????1.2 | ?3972.5 | |
| ?9-P193 | ????7 | ????50.0 | ????20 | ????29.88 | ????15.0 | ?7～8 | ????1.0 | ?3846.0 |
| ?9-P193 | ????8 | ????37.5 | ????20 | ????7.92 | ????15.8 | ?7～8 | ????1.0 | ?3703.0 |
| ?9-P193 | ????9 | ????25.0 | ????20 | ????13.82 | ????8.4 | ?7～8 | ????1.0 | ?3970.0 |
From embodiment 2 as can be seen: the medicament hydroxy aluminum has deoiling effect preferably to the polymkeric substance oil extraction-generated waste water.(polymer concentration is that 30.4～168.8mg/L, oleaginousness are 2653.23～7212.70mg/L) for the oil extraction-generated waste water of different polymer concentrations, when added amount of chemical is 37.5～50mg/L, the clearance of oil can reach more than 99.9%, handle in the water of back oleaginousness and be 4.95～7.92mg/L (＜10mg/L), reach the effluent quality requirement of sewage coagulant precipitation oil removal treatment.
Claims (1)
1, the coagulating treatment method of field polymers oil extraction-generated waste water, it is characterized in that by the chemical reaction between medicament and polymkeric substance, the enhanced coagulation effect that breakdown of emulsion, cohesion and three technological processs of reduction viscosity are organically combined, the removal efficient height of oil and polymkeric substance, oil and suspension content reach the requirement of re-injection water after the sewage disposal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98117994 CN1216751A (en) | 1998-09-15 | 1998-09-15 | Coagulation method for treating oil prodn. waste water of oil field polymers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98117994 CN1216751A (en) | 1998-09-15 | 1998-09-15 | Coagulation method for treating oil prodn. waste water of oil field polymers |
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| CN1216751A true CN1216751A (en) | 1999-05-19 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334013C (en) * | 2005-12-13 | 2007-08-29 | 大庆石油学院 | Thick oil, super thick oil effluent purifier |
| CN101250015B (en) * | 2008-03-20 | 2010-06-09 | 佛山市威力清水处理有限公司 | Method and device for processing ceramic phenolic waste water |
| CN101376532B (en) * | 2007-08-31 | 2010-12-15 | 中国石油天然气股份有限公司 | Low temperature oil-contaminated water processing method |
| CN105217761A (en) * | 2015-11-05 | 2016-01-06 | 成都科衡环保技术有限公司 | A kind of oil field extracted water treatment agent |
| CN105565449A (en) * | 2014-10-11 | 2016-05-11 | 中国石油化工股份有限公司 | Pretreatment method of flown back fracturing fluid |
| CN108238689A (en) * | 2018-01-16 | 2018-07-03 | 航天凯天环保科技股份有限公司 | A kind of processing method of polymer flooding oily water |
-
1998
- 1998-09-15 CN CN 98117994 patent/CN1216751A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334013C (en) * | 2005-12-13 | 2007-08-29 | 大庆石油学院 | Thick oil, super thick oil effluent purifier |
| CN101376532B (en) * | 2007-08-31 | 2010-12-15 | 中国石油天然气股份有限公司 | Low temperature oil-contaminated water processing method |
| CN101250015B (en) * | 2008-03-20 | 2010-06-09 | 佛山市威力清水处理有限公司 | Method and device for processing ceramic phenolic waste water |
| CN105565449A (en) * | 2014-10-11 | 2016-05-11 | 中国石油化工股份有限公司 | Pretreatment method of flown back fracturing fluid |
| CN105565449B (en) * | 2014-10-11 | 2018-03-20 | 中国石油化工股份有限公司 | A kind of preprocess method of fracturing outlet liquid |
| CN105217761A (en) * | 2015-11-05 | 2016-01-06 | 成都科衡环保技术有限公司 | A kind of oil field extracted water treatment agent |
| CN108238689A (en) * | 2018-01-16 | 2018-07-03 | 航天凯天环保科技股份有限公司 | A kind of processing method of polymer flooding oily water |
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