CN101164920A - Deep treatment and resource regeneration method for oil field extracted waste water - Google Patents
Deep treatment and resource regeneration method for oil field extracted waste water Download PDFInfo
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- CN101164920A CN101164920A CNA2007100575422A CN200710057542A CN101164920A CN 101164920 A CN101164920 A CN 101164920A CN A2007100575422 A CNA2007100575422 A CN A2007100575422A CN 200710057542 A CN200710057542 A CN 200710057542A CN 101164920 A CN101164920 A CN 101164920A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Abstract
This invention relates to the deep treatment of waste-water from oil-field and the method for reutilization of water as resource. The waste-water, after being pre-treatment, is added with KMnO4 for oxidation to remove its reductive substances, after that is proceeded the ultra-filtration to remove its precipitate and suspended impurities. The water after being treated can be used for preparing polymer solution with increased viscosity of the solution. Said solution can be fed back into oil-well for tertiary oil recovery, greatly increasing the yield to obtain good economic benefit.
Description
Technical field
The present invention relates to the advanced treatment and the resource utilization method of the extracted waste water that produced in a kind of oil field oil recovery production process.Particularly, carry out advanced treatment after making oil field extracted water through sewage plant common process system handles exactly, make it can be back to prepared polymer solution, improve the recovered water prepared polymer solution viscosity, can be used for the tertiary oil production in oil field displacement recovers the oil, improve the oil tertiary recovery rate, thereby the advanced treatment and the resource utilization that realize oil field extracted waste water are utilized again.
Background technology
Oil field extracted water is the oily(waste)water after dehydrating of crude oil separates of following the oil producing operation extraction, and except that containing suspended solid, dispersed oil and oil slick, oil in water emulsion, also contains volatile phenol, sulfide, Fe
2+Etc. multiple composition and microorganisms such as sulphate reducing bacteria, iron bacteria such as reductibility active pollutant and chemical agents.Consider problems such as environment protection and conserve water resource, it is most economical effective way as the water of productive use reinjection into reservoir that this part sewage is handled the back prepared polymer.Along with deepening continuously of oil-field development, the recovered water water ratio rises gradually.Carry out the re-injection displacement after a large amount of oil field extracted waters handled and recover the oil, the Economic development in oil field is had great significance.It is an a kind of effective way that solves oil field produced water treatment problems that sewage prepared polymer injects.In addition, the polymer flooding of sewage preparation can improve waterflooding effect effectively, improves the water drive degree, further improves the recovery ratio of underground surplus oil.
Studies show that sewage prepared polymer injects the degraded to the viscosity various degrees of polymers soln, sewage is volatile phenol, sulfide, the Fe in the on-the-spot high-pressure sealed sewage to the major cause of polymer degradation viscosity reduction
2+To the severely degrade that polymkeric substance produces, cause the injection fluid viscosity not reach requirement etc. the reductibility active substance, reduced the effect of polymer flooding.Can improve viscosity in aqueous solution though increase the implantation concentration of polymkeric substance, the corresponding production operation cost that increased makes polymer flooding be difficult to bring into play due economic benefit.Therefore, utilize polymkeric substance and corresponding supporting sewage disposal technology, under the prerequisite that satisfies the oilfield sewage prepared polymer solution requirements, can reduce polymer loading in the polymer flooding process significantly, help the development of tertiary oil recovery and the stable yields synergy in oil field.
At present, utilize polymkeric substance and corresponding supporting produced-water reinjection treatment technology to mainly contain chemical method.This method generally adopts and adds inhibiter, Scale inhibitors and sterilant.The organic inhibitor that oil field flood pattern is commonly used mainly contains: quaternary ammonium salt, imidazoles phosphoric acid amine, fatty amine, amide derivatives class, pyrrole shallow lake derivatives class, amine and nonionogenic tenside mixture etc.Scale inhibitors is oil field inhibition the most commonly used and a Technology of slowing down fouling.Widely used polymer antisludging agent mainly is polyacrylic acid and derivative thereof in the oil field.Shortcoming is that its biological degradability is poor, and at high temperature, high pH value, high Ca
2+The scale inhibition ability is relatively poor under the content.Add sterilant and be and suppress the oil field and inject one of the most extensive, effective means of microbiological corrosions harm such as water system sulphate reducing bacteria, iron bacteria.At present, domestic field use is mainly organic guanidine class, bi-quaternary ammonium salt class, isothiazolinone, quaternary ammonium type sterilant etc.In order to improve bactericidal potency, two or more sterilant can be carried out compositely, utilize synergistic effect, improve drug effect.
Domestic many oil fields still adopt old three sections (receiving oil-inclined tube sedimentation-filtering technique for promptly big jar) that oil field extracted waste water is handled back re-injection, poor effect.At present, the novel process of carrying out re-injection after the produced water disposal is generally: gravity separation, dissolved air flotation and fine filtering.For the low permeability oil field produced water disposal, stricter because of low permeability oil field to water quality requirement, have only the fine filtering of utilization and membrane separation technique just can reach its requirement usually.Therefore, the inventive method is to adopt on the basis of old three sections (receiving oil-inclined tube sedimentation-filtering technique for promptly big jar) treatment process the follow-up re-injection treatment process system that adopts senior chemical oxidation-ultra-filtration membrane isolation technique again at oil field extracted water.This technology be water outlets of old three sections (promptly big jar receive oil-inclined tube sedimentation-filtering technique) treatment process earlier by chemical oxidation of gold, remove some reducing substances after, eliminate reductibility active substance volatile phenol, sulfide, Fe in the re-injection water
2+Deng the severely degrade that polymer poly acrylamide (PAM) is produced, improve and inject fluid viscosity, reduce polymer flooding consumption and the effect that increases polymer flooding.Reduce throw out and the remarkable SS that reduces water outlet by membrane sepn again, satisfy the re-injection requirement, thereby reach the oil recovery effect that improves oil field reinjection water.
The domestic and foreign literature retrieval shows that the technology of the present invention is not seen bibliographical information.
Summary of the invention
The objective of the invention is to be to provide a kind of advanced treatment and resource utilization method of oil field extracted waste water, make the viscosity of the polymers soln of the extracted waste water preparation after art breading of the present invention, far above direct viscosity with undressed extracted waste water prepared polymer solution.With the polymers soln of the extracted waste water after this kind processing preparation displacement of reservoir oil injectant as tertiary oil recovery, can effectively improve the oil well recovery ratio, meanwhile played the waste water reclamation recycling, realize the combination of waste water treatment and resource utilization.
For achieving the above object, technical solution of the present invention is: before the advanced treatment of oil field extracted waste water, oil field extracted waste water must be earlier through pre-treatment, recovered water after the process pre-treatment is again by senior chemical oxidation treatment, by membrane filtration, the water outlet prepared polymer behind the membrane filtration carries out re-injection and recovers the oil at last.Extracted waste water has been eliminated reductibility active substance volatile phenol, sulfide, Fe in the re-injection water after handling through pre-treatment---senior chemical oxidation---membrane filtration combination process
2+Deng the severely degrade that polymer poly acrylamide (PAM) is produced, make water outlet satisfy the re-injection requirement that sewage prepared polymer injects, improve the injection fluid viscosity, thereby strengthened the oil recovery effect of oil field extracted waste water re-injection.
Describedly be used for the pre-treating process that oil field extracted waste water advanced treatment and recycling are adopted, the conventional big jar of combined process system of receiving oil-inclined tube sedimentation-quartz sand filtration or walnut shell filter that is adopted for oil field extracted waste water treatment station at present.
It is described that to be used for the senior chemical oxidization method that oil field extracted waste water advanced treatment and recycling adopted be potassium permanganate (KMnO
4) oxidation style, KMnO in its oxidation reactor
4Dosage is generally 3～30mg/L; Oxidation time is generally 3～15min.
Describedly being used for the membrane filtration that oil field extracted waste water advanced treatment and recycling are adopted, is that tubular ceramic membrane is filtered, and the mould material of employing is zirconia ceramic film (ZrO
2), membrane pore size is 30～100nm; The membrane filtration operation scheme is a cross flow filter, crosses the optional 30～100KPa of film pressure, crosses the optional 0.3～0.7L/min of water flux.Can onlinely move continuously, the entire treatment process can operation in 20～95 ℃ of water temperatures.
Described membrane filtration water outlet prepared polymer solution adopts polyacrylamide (PAM), and the mode of membrane filtration water outlet prepared polymer solution adopts pipeline static mixer.
The operation method of described chemical oxidation-film filtering reactor, as shown in Figure 1, before the oil field extracted waste water after the pre-treatment is entering the reactor water tank, in the reactor water tank, mix, open the water inlet water pump then, open 1,4,5 valves and produce water with the oxygenant of going into that adds; Open 2 valves simultaneously by concentrate recirculation; Open 3 valve adjustment and produce discharge.Open all liquid in valve 7 emptying reactors and the film device behind the end of run.After equipment moves for some time, need clean to ceramic membrane, open 1,2,3,6 valves this moment, opens the operation water pump, respectively with after clear water and the clean-out system heating film pipe being cleaned.
Beneficial effect of the present invention:
(1) the water outlet S of oil field extracted waste water after oilfield produced waste water station common process is handled
2-Concentration＜10mg/L, Fe
2+Concentration＜10mg/L, total Fe concentration＜15mg/L, total organic phenol concentration＜4.5mg/L.After the inventive method is handled, water outlet water white transparency, S
2-Concentration reduces to 0, Fe
2+Concentration reduces to 0, and total Fe concentration is reduced to below the 0.1mg/L, below total organic phenol concentration 0.1mg/L.
(2) viscosity of the recovered water prepared polymer solution after art breading of the present invention, the viscosity of comparable recovered water prepared polymer without advanced treatment has very big lifting.
(3) the inventive method can effectively be handled the extracted waste water that produces in the oil recovery process of oil field.Significantly improve the viscosity of polymer solution made up by sewage with this technical finesse oil field extracted waste water, water filling can directly reach the re-injection requirement, under the prerequisite that satisfies the oilfield sewage prepared polymer solution requirements, can reduce the polymer loading in the polymer flooding process significantly, help the stable yields synergy of tertiary oil recovery.
Description of drawings
Fig. 1 is a processing technological flow synoptic diagram of the present invention.Fig. 2 is the viscosity correlation curve figure of example 1; Fig. 3 is the viscosity correlation curve figure of example 2.
Embodiment
Embodiment 1
Injection water (through big jar of water outlet of receiving oil-inclined tube sedimentation-filtering technique pre-treatment of oil field extracted waste water treatment station conventional treatment process) with Dagang Oilfield man two station J11 wells is process object, and oil field extracted waste water is through water outlet S after the pre-treatment
2-Concentration 2.5mg/L, Fe
2+Concentration 3.0mg/L, total Fe concentration 3.9mg/L, total organic phenol concentration 2.1mg/L.Again by senior chemical oxidation treatment, add oxygenant KMnO through the recovered water after the pre-treatment
4Be 5mg/L, hybrid reaction 15min in the reactor water tank, at last by membrane filtration water outlet water white transparency, S
2-Concentration reduces to 0, Fe
2+Concentration reduces to 0, and total Fe concentration is reduced to 0.05mg/L, total organic phenol concentration 0.1mg/L.
The membrane filtration water outlet adds extra large special 10203-1 type polymer P AM, and polymer poly acrylamide (PAM) dosage is 1500mg/L.At after this continuous 33 days viscosity number and direct viscosity correlation curve with the extracted waste water prepared polymer solution, the viscosity correlation curve figure of example 1 sees Fig. 2.
Embodiment 2
Injection water (through big jar of water outlet of receiving oil-inclined tube sedimentation-filtering technique pre-treatment of oil field extracted waste water treatment station conventional treatment process) with Dagang Oilfield man two station J11 wells is process object, and oil field extracted waste water is through water outlet S after the pre-treatment
2-Concentration is 4.9mg/L, Fe
2+Concentration 5.2mg/L, total Fe concentration 7.4mg/L, total organic phenol concentration 2.7mg/L.Again by senior chemical oxidation treatment, add oxygenant KMnO through the recovered water after the pre-treatment
4Amount is 15mg/L, hybrid reaction 5min in the reactor water tank, and at last by membrane filtration water outlet water white transparency, S
2-Concentration reduces to 0, Fe
2+Concentration reduces to 0, and total Fe concentration is reduced to 0.1mg/L, total organic phenol concentration 0.1mg/L.
The membrane filtration water outlet adds 2022 type polyacrylamide (PAM) polymkeric substance, and polymer P AM dosage is 1500mg/L.At after this continuous 33 days viscosity number and direct viscosity correlation curve with the recovered water prepared polymer solution, the viscosity correlation curve of example 2 is seen Fig. 3.
Claims (5)
1. the advanced treatment of an oil field extracted waste water and resource utilization method, it is characterized in that: oil field extracted waste water must be earlier through pre-treatment, recovered water after the process pre-treatment is again by senior chemical oxidation treatment, by membrane filtration, the water outlet prepared polymer behind the membrane filtration carries out re-injection and recovers the oil at last.Extracted waste water has been eliminated reductibility active substance volatile phenol, sulfide, Fe in the re-injection water after handling through pre-treatment---senior chemical oxidation---membrane filtration combination process
2+Deng the severely degrade that polymkeric substance is produced, make water outlet satisfy the re-injection requirement that sewage prepared polymer injects, improve the injection fluid viscosity, thereby strengthened the oil recovery effect of oil field extracted waste water re-injection;
2. according to claim 1ly be used for the pre-treating process that oil field waste advanced treatment and recycling are adopted, receive oil-inclined tube sedimentation-quartz sand filtration or walnut shell filter combined process system for conventional big jar that is adopted for oil field extracted waste water treatment station at present;
It is 3. according to claim 1 that to be used for the senior chemical oxidization method that oil field waste advanced treatment and recycling adopted be potassium permanganate (KMnO
4) oxidation style, KMnO in its oxidation reactor
4Dosage is generally 3～30mg/L; Oxidation time is generally 3～15min;
4. according to claim 1ly being used for the membrane filtration that oil field waste advanced treatment and recycling are adopted, is that tubular ceramic membrane is filtered, and the mould material of employing is zirconia ceramic film (ZrO
2), membrane pore size is 30～100nm; The membrane filtration operation scheme is a cross flow filter, crosses the optional 30～100KPa of film pressure, crosses the optional 0.2～1.5L/min of water flux.Can onlinely move continuously, the entire treatment process can operation in 20～95 ℃ of water temperatures;
5. method according to claim 1 is characterized in that: described polymer solution made up by sewage adopts polyacrylamide (PAM), and the mode of polymer solution made up by sewage adopts pipeline static mixer.
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| CN2007100575422A CN101164920B (en) | 2007-06-05 | 2007-06-05 | Deep treatment and resource regeneration method for oil field extracted waste water |
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| CN101597108B (en) * | 2009-06-19 | 2012-01-25 | 中国海洋大学 | Method for reducing scaling between oil field oil extraction transportation system and stratum |
| CN102910706A (en) * | 2012-10-16 | 2013-02-06 | 中国石油化工股份有限公司 | Method and device for performing precise processing to thin interbed low permeability oilfield produced water through ceramic membranes |
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