EP2920119A1 - Purification d'eau souillée par de l'huile et dispositif approprié pour cela - Google Patents

Purification d'eau souillée par de l'huile et dispositif approprié pour cela

Info

Publication number
EP2920119A1
EP2920119A1 EP13789327.7A EP13789327A EP2920119A1 EP 2920119 A1 EP2920119 A1 EP 2920119A1 EP 13789327 A EP13789327 A EP 13789327A EP 2920119 A1 EP2920119 A1 EP 2920119A1
Authority
EP
European Patent Office
Prior art keywords
water
mixture
oil
membrane
protective material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP13789327.7A
Other languages
German (de)
English (en)
Inventor
Ulrich Baeuerle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eviola Sa
Original Assignee
Eviola Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eviola Sa filed Critical Eviola Sa
Priority to EP13789327.7A priority Critical patent/EP2920119A1/fr
Publication of EP2920119A1 publication Critical patent/EP2920119A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/16—Feed pretreatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
    • C10G31/08—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by treating with water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20—Displacing by water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/40—Separation associated with re-injection of separated materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/04—Backflushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B01D65/04—Membrane cleaning or sterilisation ; Membrane regeneration with movable bodies, e.g. foam balls
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • 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
    • 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
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/10—Feedstock materials
    • C10G2300/1033—Oil well production fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities
    • C10G2300/202—Heteroatoms content, i.e. S, N, O, P
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/80—Additives
    • C10G2300/805—Water
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids

Definitions

  • the invention relates to a method and apparatus for purifying a mixture of oil contaminated water, as well as to a method for producing purified process water in the extraction and / or refining of crude oil.
  • a petroleum / water mixture is generally extracted from the earth.
  • this mixture consists of the formation water already contained in the oil-bearing layer and the oil that is to be pumped.
  • water In older oilfields, water must be forced into the petroleum formation to deliver the oil / water mixture through injection wells that are located some distance from the well. As a result of the pressure built up in this way, the water in the oil-carrying layer flows to the production well, carrying with it oil which can then be taken out together with the injection water and possibly existing formation water at the production well.
  • This oil / water mixture must now be separated to obtain suitable crude oil for further processing.
  • the water content of the oil / water mixture varies from one oil field to another and also changes with the progressive exploitation of the oil field.
  • oil-water mixtures are highly harmful to the environment and therefore can not be discharged untreated into the environment. They must be disposed of, for example, consuming. Basically, it is therefore desirable to prepare oil-water mixtures by the oil is separated as possible from the water, so as to obtain clear water, which can then be used, for example.
  • phase separator For the separation of the oil / water mixture phase separator are usually used, ie, the oil / water mixture is in a tank in which the lighter oil and the heavier water can segregate under the influence of gravity, so that an oil phase at the surface and a water phase (eg in the case of oil production reservoir water) forms in the lower tank area. After such a separation by gravity but still remain between 500 and 1000 mg of oil per liter of water. On the one hand, this means a considerable waste of valuable oil, and on the other hand, the water can not be released into the environment due to the significant pollution with oil, but must be further processed and cleaned.
  • currently available treatment methods and treatment devices have significant disadvantages in terms of cost and processing capacity.
  • German oil fields is often achieved via coalescence a reduction of the residual oil content up to about 60 ppm. But this burden is still too high for a direct discharge of water, so that here, too, the water can only be delivered to a sewage treatment plant, resulting in significant additional costs.
  • the invention is intended to allow long run times with little maintenance breaks and at the same time can be carried out at low cost. It also seeks to provide an improved process for the production of purified process water for the extraction and / or refining of crude oil and for the extraction and / or refining of crude oil.
  • a method for purifying a mixture of oil-polluted water the mixture is fed to a container having a Having ultrafiltration unit with a membrane.
  • an admixture is added to the mixture on a flow path to the membrane, which reacts with the mixture or with the water to form a hydrophilic reaction product as a protective material (50), and wherein the protective material attaches to the membrane as a film and so on keeps free oil in the mixture from the membrane.
  • the mixture is then purified on passage through the membrane in clear water.
  • the clear water is discharged downstream of the membrane from the ultrafiltration unit. By removing clear water, the mixture remaining in the container is concentrated in the content of oil. This mixture is removed from the container.
  • the membrane is coated with a film in the manner of a secondary membrane in the form of the protective material.
  • This is a film applied during operation which does not permanently adhere to the membrane but is renewable or backwashable.
  • the protective material of the membrane may e.g. be supplied continuously and / or in time periods and / or at intervals of time.
  • the addition of the additive takes place upstream in the feed path of the oil-water mixture to the membrane.
  • the hydrophilic reaction product formed after the reaction with the water hits the membrane and can accumulate there.
  • the oil-water mixture for the process is e.g. from a pre-purification stage in which the original oil content in the water has already been reduced, e.g. a gravitational phase separator or other physically operating phase separator.
  • the oil-water mixture is supplied to an ultrafiltration, wherein in order to support the ultrafiltration the mixture before the feed to ultrafiltration a protective material is added, directly or after chemical reaction with the water from the mixture, as a film on the membrane free oil from this keeps away.
  • a membrane for the ultrafiltration stage hollow fiber membranes can be used, which are inexpensive to manufacture and provide a large membrane area available in a small footprint. These membranes are designed so that when inflowing water only the water molecules can pass through the membrane pores, the larger hydrocarbons that make up the oil, but are retained.
  • the membrane may for example consist of polymers or contain them.
  • the clear water can then be removed.
  • This clear water has only dissolved in water hydrocarbons. Solids, free or emulsified oil are completely separated.
  • the clear water is pure enough, e.g. be used as injection water for injection wells in oil production, without the risk of blocking the pore spaces of the oil field.
  • the clear water taken from the ultrafiltration is also sterilized. This is of great importance for the suitability as injection water, since germs could decompose the crude oil stored in the oil field and thus destroy the oil field. Even if no use is made as injection water, the further processing, for example, in a sewage treatment plant, simplified by the significantly reduced residual oil content and can be carried out more cheaply.
  • the clear water can also be used for other purposes, such as boiler feed water in petroleum processing.
  • the ultrafiltration stage clear water is removed, the residual oil is concentrated again in the remaining water phase.
  • This water phase with concentrated residual oil content is e.g. returned to the process.
  • the concentrated mixture can also be fed back to a pre-purification stage, which can still effectively separate water with higher oil content.
  • a flow can be generated in the container, by means of which the oil-water mixture is passed several times to the membrane.
  • This further increases the filter performance.
  • an admixture which contains the protective material is added to the mixture.
  • the protective material is thus supplied in pure form or as part of an adding agent directly to the oil-water mixture and is deposited in unchanged form on the membrane.
  • an additive is added to the mixture, wherein the protective material forms only by a reaction of the additive with the mixture.
  • the reaction can be chemical or physical in nature - eg agglomeration or similar. - be.
  • the transport time of the additive is suitably chosen from its addition to the oil-water mixture to impingement or adhesion to the membrane so that the reaction takes place to the desired extent.
  • the choice of transport time is done, for example, by the choice of the place of addition and / or the choice of the flow rate of the oil-water mixture.
  • a precipitant cooperating with the water is used as additive.
  • the principal reaction here is the production of a precipitant product in the water, but an actual precipitation in the classical sense does not occur.
  • Due to the precipitation of the protective agent in the reaction of the additive with the water very small flakes in the ⁇ area, which accumulate on the membrane. The flakes are therefore used only in their capacity as a protective material, which attaches to the membrane, but not to the oil droplets and does not react with the oil.
  • iron-III chloride FeCb is used as an additive.
  • This admixture reacts with the water of the mixture to yield the smallest iron hydroxide particles [Fe (OH) 3 ] as protective agents that form on the membrane in the form of micro- or nanoparticles.
  • Fe (OH) 3 is insoluble in water and forms a very thin hydrophilic top layer on the membrane which keeps the free oil and oil-water emulsion droplets away from the membrane surface. The membrane thus can not block.
  • the additive material can be added in a concentration which is insufficient to react with the oil due to chemical or physical reactions. In other words, the amount of oil which can be separated by reaction is orders of magnitude below the membrane-filtered oil quantity. For example, ferric chloride is added in the range of less mg / l.
  • the additive is selected such that after the reaction with the water as the protective material hydrophilic micro particles of a predeterminable maximum size, which move in the ⁇ range arise. In other words, therefore, very small flakes or nanoflocs are used.
  • the hydrophilicity is chosen such that essentially only water, but not free oil, accumulates on the film formed from the protective material. So water gets through the membrane, oil is kept away from it.
  • the mixture is supplied to the container, starting from a storage reservoir.
  • the discharged from the container mixture is then returned to the storage reservoir.
  • the result is a circulation system in which the concentrated oil-water mixture is subjected to a new process passage.
  • a pre-purification stage can be operated in the circulation, eg in the area of the storage reservoir.
  • the supply storage can be designed as a sink for gravity separation.
  • the protective material can be removed by backwashing the membrane against the flow direction in which water permeates the membrane during regular filter operation. This happens at intervals or as needed. Thus, the membrane is freed from previous protective material and new protective material can accumulate.
  • the object of the invention is achieved by a method according to claim 10.
  • the purified process water is treated as clear water with an o.g. Process produced from oil polluted water.
  • polluted process water is used for crude oil extraction or refining.
  • Such process water is e.g. so-called "produced water” and / or “desalter water”.
  • "clean" process water is generated from polluted process water, and the supply of fresh water in the extraction and / or refining of crude oil is therefore avoided or drastically reduced.
  • the purified process water is used as boiler feed water and / or as desalination water and / or as other recycled, so recycled by the above process water, so these processes - u.U. again - fed.
  • the purified process water can be used particularly advantageous for reinjection in an oil field.
  • the device comprises a container having an ultrafiltration unit with a membrane, a feed line opening into the container for the mixture and a feed additive device such that the additive reacts with the mixture to form a hydrophilic reaction product as a protective material which acts as a film on the membrane, thus keeping free oil in the mixture from the membrane.
  • the adding device preferably opens into a flow path of the mixture towards the membrane.
  • the apparatus also includes a clear water conduit leading away from the ultrafiltration unit downstream of the membrane. This clear water is discharged, which has been cleaned when passing through the membrane.
  • a derivative away from the container derivative for oil-concentrated mixture is also part of the device. Advantages of the device have already been explained analogously with reference to the method.
  • the adding device opens into the supply line.
  • the addition can be very easy, since only the supply line must be provided with a corresponding connection.
  • the device may preferably comprise a storage store, e.g. have a sink for receiving deposit water.
  • This deposit water usually comes from a phase separator, in which a separation of a petroleum / water mixture has already taken place from the oil production and usually has an oil content of 500 to 1000 mg / l. However, it is also possible deviating oil contents, which may range from 200 to 5000 mg / l.
  • sink for example, a clarifier, a pond or a tank in which a further gravitational separation is performed.
  • lamellar clarifier, SchrägrohrInstituter, quick clarifier or coalescence can be used.
  • Particularly advantageous can be used as a depression depressurization flotation.
  • This air or gas bubbles are introduced into the reservoir water, which lead to a separation of oil and water.
  • the sink then forms three phases, the oily surface phase, which can be removed, a hydrous phase with a reduced residual oil content, and at the bottom of the sink may carry solids that are deposited as sludge and removed at regular intervals.
  • the water-containing phase with reduced residual oil content can then be removed from the sink and fed to the subsequent ultrafiltration.
  • 1 is a schematic representation of the oil production in an oil field and the water processing in oil production
  • FIG. 2 is a schematic representation of a water treatment plant according to the invention
  • Fig. 3 the concentration unit of Fig. 2 in detail.
  • Fig. 1 shows an external water source 1 (for example, either an underground aquifer or sea water), extracted from the water as injection water and pumped after treatment in a treatment plant 2 (for example seawater desalination) via an injection well 4 in an oil field 5.
  • the injection water can be stored in advance in a tank 3.
  • Due to the injected injection water a water bank 6 forms in the oil field 5 and presses an oil bank 7 in the direction of a delivery well 10.
  • the oil bank 7 is made up of a share of oil 8, here crude oil, and a proportion of formation water 9 together.
  • the oil 8 is due to its density more in the higher part of the oil bank 7, while the formation water 9 is stored mainly in the lower areas.
  • a mixture 40 of oil 8 and water 42 (process water, here Formationswasser 9 and / or injection water). This is subjected to a separation in a first treatment stage 1 1. This usually takes place in phase separators, so it is a gravitational separation process. Separated oil 8 is stored from the treatment stage 1 1 via a line 12 in a tank 18 until it is transported away for further processing. Remains a residual mixture 40 still contaminated with oil 8 water 42. In systems of the prior art, the mixture 40 is pumped for compression in an aquifer, in disposal ponds or other external disposal such as industrial or municipal sewage treatment plants supplied (in the Figure symbolized by the arrow 13). This is where the present invention begins.
  • the mixture 40 is led instead of along the arrow 13 via a line 14 to a water treatment plant 15.
  • a water treatment plant 15 There is an inventive treatment or separation of oil 8 and water 42 (see Fig. 2).
  • the additionally obtained oil 8 can be transferred via the line 16 into the tank 18 and thus increases the overall yield of oil production.
  • Purified clear water 44 can be transferred via a line 17 into the injection water tank 3 and used for injection into the oil field 5. This eliminates the need to promote and reprocess injection water from the water source 1 at great expense, and at the same time an environmental impact is avoided by polluted water in the form of the mixture 40 from the oil production process.
  • Fig. 2 shows the water treatment plant 15 in detail.
  • the incoming mixture 40 first passes into a gravity separation tank 12. From there it is passed via a line 20 into a storage reservoir 21 in the form of a feed tank for oil recovery. From this storage tank 21, the mixture 40 is fed to a sink 22.
  • depression 22 uses compressed air flotation (DAF) with air bubbles.
  • DAF compressed air flotation
  • gas flotation or other separation methods such as coalescence separators
  • an existing separator or phase separator can be used even with appropriate equipment of the conveyors, if already sufficient reduction of the oil content in the mixture 40 can be achieved with this. This is especially the case with conveyor systems, the already equipped with a multiphase separator or a flotation separation.
  • the reduced oil content mixture 40 is discharged via a supply line 28 and fed to a container 48 a concentration unit 29 or fining unit.
  • a concentration unit 29 or fining unit In the supply line 28 opens an adding means 27 for an additive with a protective material 50.
  • the mixture 40 the protective material 50 is added.
  • the mixture 40 enters the concentration unit 29.
  • This concentration unit 29 has in or on the container 48 an ultrafiltration line 52, whose membrane 30, in this case an ultrafiltration membrane, is in communication with the mixture 40.
  • This membrane 30 consists of a polymer membrane and is able to withhold particles from a predeterminable size, in the example with a size of more than 0.02 ⁇ . Thus, all free particles such as oil 8 or emulsion emulsion droplets, but also solids and germs in the mixture 40 are reliably retained.
  • the membrane 30 is used in the example in cross-flow operation, ie, the mixture 40 is guided along the membrane 30 at a relatively high speed. Alternatively, however, a dead-end operation is possible. In order to achieve the best possible efficiency of the filtration, it is advantageous in the case of cross-flow operation if the mixture 40 is passed several times past the membrane 30 with a circulation process. As the mixture 40 travels along the membrane 30, water molecules pass through the membrane 30 and are subsequently removed. Clear water 44 is thus produced in the ultrafiltration unit 52. This clear water 44 (permeate) is subsequently free of free oil 8, solids and germs and contains only small residues of dissolved hydrocarbons. The clear water 44 can then be discharged via a clear water line 54 into a clear water tank 33.
  • the clear water 44 can then, for example, as explained in connection with Figure 1, used as injection water or, optionally after further treatment, used for the production of process steam or given for disposal.
  • the remaining in the container 48 mixture 40 is concentrated by the outflow of clear water 44 in the oil content.
  • the concentrated mixture 40 is passed via a discharge line 32 from the container 48 back into the storage reservoir 21 and from there again the sink 22, where the concentrated oil 8 can be recovered.
  • Fig. 3 shows the concentration unit 29 in detail.
  • the protective material 50 added to the mixture 40 by the adding device 27 passes along a flow path 56 of the mixture 40 in the container 48 to the membrane 30.
  • the protective material 50 which is in the form of hydrophilic microparticles or nanoparticles, is deposited in the form of a film 62 the membrane 30 at.
  • the film 62 or the protective material 50 prevents free oil 8, which is still present in the mixture 40, from attaching to the membrane 30 and clogging it. Nevertheless, the film 62 allows clear water 44 to pass through the membrane 30 along the flow direction 60. Clogging, sticking, etc. of the membrane 30 by free oil 8 is thus prevented. Thus, clear water 44 can always be withdrawn from the mixture 40 in the container 48, whereby the mixture 40 is concentrated in the content of oil 8.
  • the membrane 30 can be backwashed against the flow direction 60, for example with clear water 44.
  • the film 62 of protective material 50 is released from the membrane 30 and the membrane 30 may be covered with a new film 62 of protective material 50 to regain full filter performance.
  • Fig. 3 shows in a preferred embodiment in dashed lines an adding device 27, which does not open into the supply line 28, but directly into the container 48. This also does not directly add to the mixture 40 in the flow path 56 the protective material 50, but rather an additive 58.
  • the protective material 50 is contained and deposited as described above as a film 62 to the membrane 30 at.
  • the additive 58 does not contain the protective material 50 directly or in a finished form. Only when in contact with the mixture 40, the additive 58 reacts with the mixture 40 and thus forms the protective material 50, which then finally again In this case, the protective material 50 is indirectly added to the mixture 40 in other words.
  • FIG 3 thus shows a device according to the invention, comprising the container (48), which has an ultrafiltration unit (52) with a membrane (30) which opens into the container (48) feed line (28) for the mixture (40 ), the addition means (27) for the additive (58) and the protective material (50), respectively, leading into the flow path (56) of the mixture (40) towards the membrane (30), downstream of the ultrafiltration unit (52) Membrane (30) leading away clear water line (54) for when passing through the membrane (30) purified clear water (44), and the container (48) leading away discharge (32) for in the content of oil (8) concentrated mixture (40).
  • the additive 58 is a flocculant or precipitant that reacts chemically with water.
  • ferric chloride FeCb is used in a concentration between 0.1 and 20 mg / l, alternatively between 0.5 and 10 mg / l, alternatively, and preferably between 1 and 5 mg / l.
  • iron hydroxide is formed as a hydrophilic protective material which attaches itself to the membrane.
  • the additive may comprise aluminum chloride AICI3 (gives aluminum hydroxide as the protective material), but in principle also other protective materials 50 or reactants are possible.
  • the flocculant or precipitant is not used in the conventional sense and in conventional dosage. There is no classical precipitation and there is no chemical or physical reaction with the oil.
  • the additives used for the present process are not classical precipitating agents for the separation of oil / water emulsions. In contrast to these classic precipitants, the additives used here are extremely inexpensive and thus enable economical operation of the plant. In addition, the additives used are added in a concentration that falls below the concentration of the precipitating agent in a classical precipitation many times.
  • the system is otherwise dimensioned such that a transport time T is not sufficient that a classic flocculant or precipitant sufficient large, a classic precipitation enabling particle forms.
  • the transport time T is the time required for the mixture to reach from the metering point of the additive 58 to the membrane 30, that is, to travel a distance s.
  • the dimensioning of the transport time T takes place concretely by placing the adding device 27 at a suitable distance s from the membrane 30 at a given flow rate of the mixture 40 along the flow path 56. In the transport time T, only microscopically small particles of a predefinable maximum size can form, which form the protective material 50 and attach to the membrane 30 as a film 62.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Hydrology & Water Resources (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

L'invention concerne un procédé de purification d'un mélange (40) d'huile (8) et d'eau (42), dans lequel on introduit le mélange (40) dans une cuve (48) équipée d'un groupe d'ultrafiltration (52) comprenant une membrane (30) et on ajoute au mélange (40) un matériau protecteur (50) qui, directement ou après une réaction chimique avec l'eau du mélange (40), éloigne de la membrane (30) l'huile (8) libre présente sous forme de film (62) sur celle-ci. A partir d'eau de procédé (42) souillée par du pétrole (8), on produit ainsi de l'eau de procédé purifiée servant à l'extraction et/ou au raffinage de pétrole (8). Lors de l'extraction et/ou du raffinage de pétrole (8), l'eau de procédé (42) purifiée est utilisée comme eau d'alimentation et/ou comme eau de désalinisation ou pour la réinjection dans un champ pétrolifère (5). Un dispositif de purification (64) comprend essentiellement une cuve (48) équipée d'un groupe d'ultrafiltration (52) comprenant une membrane (30), une conduite (28) d'alimentation de la cuve (48) et un dispositif (27) servant à ajouter le matériau protecteur (50) dans le trajet d'écoulement (56) vers la membrane (30).
EP13789327.7A 2012-11-13 2013-11-12 Purification d'eau souillée par de l'huile et dispositif approprié pour cela Ceased EP2920119A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13789327.7A EP2920119A1 (fr) 2012-11-13 2013-11-12 Purification d'eau souillée par de l'huile et dispositif approprié pour cela

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12192334.6A EP2730548A1 (fr) 2012-11-13 2012-11-13 Nettoyage d'eau salie par de l'huile, génération d'eau de processus, production et/ou raffinage d'hydrocarbures
PCT/EP2013/073595 WO2014076068A1 (fr) 2012-11-13 2013-11-12 Purification d'eau souillée par de l'huile et dispositif approprié pour cela
EP13789327.7A EP2920119A1 (fr) 2012-11-13 2013-11-12 Purification d'eau souillée par de l'huile et dispositif approprié pour cela

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EP2920119A1 true EP2920119A1 (fr) 2015-09-23

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EP13789327.7A Ceased EP2920119A1 (fr) 2012-11-13 2013-11-12 Purification d'eau souillée par de l'huile et dispositif approprié pour cela

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US (1) US10358360B2 (fr)
EP (2) EP2730548A1 (fr)
CN (1) CN104837776A (fr)
CA (1) CA2891606C (fr)
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WO (1) WO2014076068A1 (fr)

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CA3042570A1 (fr) * 2016-07-20 2018-01-25 Petroleo Brasileiro S.A. - Petrobras Systeme et procede hybride de traitement d'eau produite et d'eau de mer pour reinjection dans un reservoir de petrole sous-marin
US10525415B2 (en) * 2017-06-15 2020-01-07 Saudi Arabian Oil Company Processing systems for produced water and methods for recovering organic compounds from the produced water
US10703989B2 (en) 2017-09-29 2020-07-07 Saudi Arabian Oil Company Conserving fresh wash water usage in desalting crude oil
US11268032B2 (en) 2019-07-23 2022-03-08 Trc Operating Company, Inc. Process and system for the above ground extraction of crude oil from oil bearing materials
CN112023703A (zh) * 2020-08-14 2020-12-04 南开大学 一种多功能真空超滤装置

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DE102009028162A1 (de) * 2009-07-31 2011-02-10 Gwt Georgi Wassertechnik Gmbh Wasseraufbereitung über Ultrafiltration

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US7578939B2 (en) * 2004-12-09 2009-08-25 Board Of Trustees Of Michigan State University Ceramic membrane water filtration
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WO2014076068A1 (fr) 2014-05-22
MX2015005974A (es) 2016-02-05
EP2730548A1 (fr) 2014-05-14
CN104837776A (zh) 2015-08-12
CA2891606C (fr) 2021-05-18
CA2891606A1 (fr) 2014-05-22
US10358360B2 (en) 2019-07-23
US20160297692A1 (en) 2016-10-13

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