EP3724131A1 - Procede de traitement par flottation d'une solution aqueuse issue d'une production petroliere - Google Patents
Procede de traitement par flottation d'une solution aqueuse issue d'une production petroliereInfo
- Publication number
- EP3724131A1 EP3724131A1 EP18796976.1A EP18796976A EP3724131A1 EP 3724131 A1 EP3724131 A1 EP 3724131A1 EP 18796976 A EP18796976 A EP 18796976A EP 3724131 A1 EP3724131 A1 EP 3724131A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- aqueous solution
- flotation
- concentration
- salt
- 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.)
- Withdrawn
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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0205—Separation of non-miscible liquids by gas bubbles or moving solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
-
- 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
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- 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
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
- C02F1/681—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of solid materials for removing an oily layer on water
-
- 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
- C02F2101/301—Detergents, surfactants
-
- 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
- C02F2303/08—Corrosion inhibition
Definitions
- the present invention relates to the field of treatment of an aqueous solution comprising at least one dispersed oil phase in the form of drops, the oil being in particular a crude oil resulting from oil production.
- the present invention applies to the treatment of a production water resulting from a first water / oil separation step applied to a petroleum effluent, the effluent being for example derived from an enhanced recovery of trapped hydrocarbons. in an underground formation.
- the present invention can also be applied directly to a petroleum effluent, when this effluent is very predominantly aqueous.
- an enhanced recovery operation for hydrocarbons trapped within a geological reservoir comprises injecting a flushing fluid into an injector well, the flushing fluid flushing fluids trapped in the porous medium of the geological reservoir to at least a production well.
- the production well of a production well is crowned at the surface by the installation of a wellhead from where a surface flowline ("flowline") which collects the petroleum effluent thus produced.
- This fluid is a mixture comprising a part of the hydrocarbons present in the formation (in the form of oil and gas), components of the sweeping fluid (such as polymers, surfactants, and / or alkaline compounds as in the case of the chemical EOR), and water (possibly in the form of brine).
- the "flowline” generally conducts the petroleum effluent to a treatment plant that may include means for mixing, dilution, separation and / or treatment of oil, water and gas.
- a treatment plant that may include means for mixing, dilution, separation and / or treatment of oil, water and gas.
- the first step in the treatment of petroleum effluents consists in separating water and oil in a gravitational manner (for example by means of a di- or triphasic separation process, or of a "Free-Water” type equipment Knock-Out ").
- the oil thus recovered is directed to desalination and dehydration processes.
- the discharge fluid also called production water
- the discharge fluid is a substantially aqueous fluid, but it usually still includes oil drops and impurities.
- the water is directed to water treatment processes.
- a standard quality water is evacuated or (re) injected by a suitable well into an underground formation.
- One known method for the treatment of production water is the flotation technique, as described for example in the document (Moosai and Dawe, 2003: Moosai, Roshni & Dawe, Richard (2003).) Gas attachment of oil droplets Separation and Purification Technology, 33 (3), 303-314, Separation and Purification Technology, 33303-314, 10.1016 / S1383-5866 (03) 00091 -1).
- This technique consists of collecting at least a portion of the oil droplets dispersed in the aqueous phase, for example via the injection of a gas into the production water.
- the set of gas bubbles and oil droplets thus formed has a density much lower than that of the oil droplets alone, which greatly accelerates the oil / water separation by gravitational effect.
- the collection of oil drops by flotation is sometimes slow or inefficient.
- the present invention aims to improve the efficiency and speed of the flotation separation of the oil and water phases present in an aqueous solution comprising drops of oil in dispersed form, such as production water.
- the process according to the invention comprises a step consisting of adding at least tetravalent cations in the production water, prior to the oil / water flotation separation step.
- the invention relates to a process for the treatment of an aqueous solution comprising at least one dispersed oil phase in the form of drops in an aqueous phase, said oil being a crude petroleum oil.
- the invention comprises at least the following steps:
- said oil phase is separated by flotation from said aqueous phase present in said aqueous solution in which at least said salt has been added.
- said concentration can be predetermined so that the zeta potential of said oil drops is between -20mV and + 20mV.
- said concentration can be predetermined so that the zeta potential of said oil drops is between -1 OmV and +1 OmV.
- the tetravalent salt may be a zirconium salt.
- the zirconium salt may be a zirconium chloride.
- At least one anti-corrosion agent may be injected simultaneously with said zirconium chloride.
- said tetravalent salt concentration may be between 0.05 ppm and 50 ppm.
- said flotation can be carried out at least by means of injecting a gas into said aqueous solution.
- said injected gas may be nitrogen.
- said flotation can be carried out at least by means of a depressurization of said aqueous solution.
- said aqueous solution may further comprise a surfactant.
- said aqueous solution may be a production water.
- said aqueous solution may be a production effluent whose oil-to-water ratio is greater than 98%.
- a step of primary separation of said phases present in said effluent can be carried out beforehand, by means of a separation of gravitational type, by centrifugation, or by hydrocyclone.
- FIG. 1 shows the evolution of the Ct / Cinit ratio as a function of the time of injection of the gas into a flotation cell, in the case of an aqueous solution sample comprising a tetravalent salt (curve C2) and in the case without tetravalent salt (curve C1).
- Figure 2 shows the evolution of the zeta potential (ZP) of the oil drops as a function of the concentration of zirconium chloride ([ZRCL4]) in an aqueous solution.
- FIG. 3 shows the evolution of the Ct / Cinit ratio as a function of time t, in the case where no tetravalent salt is injected into an aqueous solution (curve C1), and in the case where a zirconium chloride is added to the aqueous solution in a concentration equal to 0.5 ppm (curve C2).
- Figure 4 shows the evolution of the Ct / Cinit ratio as a function of time, in the case where no tetravalent salt is injected into a production water sample (curve C1), and in the case where the zirconium chloride is injected in a concentration equal to 13 ppm (curve C2).
- Oil effluent in the sense of the present invention, it is a fluid recovered from at least one production well during a process for the enhanced recovery of hydrocarbons from a geological reservoir.
- This fluid is a mixture comprising a part of the hydrocarbons present in the formation (including at least part of the hydrocarbons present in the geological reservoir in the form of an oil), optionally components of the sweeping fluid (such as surfactants, alkaline compounds as in the case of chemical EOR, etc.) and water (optionally in brine form) from the sweep fluid and / or the geological reservoir.
- the oil effluent is generally in the form of a mixture of water and oil.
- the proportion of water with respect to the oil (or "watercut") of the petroleum effluent may for example be between 5 and 99%, and generally changes depending on the production time of the field;
- Production water in the sense of the present invention, it is a fluid from a first oil / water separation step applied to a production effluent.
- Production water is generally characterized by a low proportion of residual oil relative to the aqueous phase, generally less than 1%;
- the present invention relates to a process for the treatment of an aqueous solution comprising at least one dispersed oil phase in the form of drops in the aqueous solution. More specifically, the present invention relates to the separation of the oil and water phases of an aqueous solution.
- the oil is a crude oil.
- the process according to the invention relates to the treatment of an aqueous solution resulting from an assisted hydrocarbon recovery operation within a geological formation.
- the aqueous solution according to the invention is a production water.
- the aqueous solution according to the invention is a production effluent whose water / oil ratio is at least 98%.
- a production effluent having such a watercut may have been obtained after a primary separation of the phases present in the effluent, carried out for example by means of a gravitational type separation, by centrifugation, or by hydrocyclone.
- the method according to the invention comprises at least the following steps:
- At least one tetravalent salt is added to the aqueous solution to be treated in a predetermined concentration
- the process according to the invention aims to improve the separation of the oil and water phases present in an aqueous solution, by adding, prior to the implementation of a flotation process, a tetravalent salt in the aqueous solution to be treated.
- the flotation is implemented by an injection of a gas into the aqueous solution to be treated (so-called "Induced Gas Flotation" process).
- the injected gas may be air, nitrogen or a gas available on the site (natural gas for example).
- the flotation can be carried out by depressurizing the vapor solubilized gas (so-called "Dissolved Gas Flotation"process); this depressurization can be carried out by means of a double inlet pump, allowing, for example, mixing the aqueous solution with steam.
- a double inlet pump allowing, for example, mixing the aqueous solution with steam.
- the addition of a tetravalent salt in an aqueous solution comprising dispersed oil drops makes it possible to lower the zeta potential of these oil drops.
- the electrostatic repulsions between the drops of oil and the bubbles of gas generated by flotation in the aqueous solution during step 2 are then reduced, which allows the oil drops to adhere to the bubbles generated by flotation, promoting their rise to the surface.
- the method according to the invention makes the flotation step faster and more efficient.
- the concentration according to which the tetravalent salt is added is predetermined so that the zeta potential of the drops of oil dispersed in the aqueous phase is between -20mV and + 20mV.
- a zeta potential included in such a range allows an effective and rapid separation of the oil and water phases present in an aqueous solution, as demonstrated in the application examples below.
- the concentration according to which the tetravalent salt is added is predetermined so that the zeta potential of the drops of oil dispersed in the aqueous phase is between -10mV and + 10mV.
- a zeta potential included in such a range allows even more efficient and rapid separation of oil and water phases present in an aqueous solution, as demonstrated in the application examples below.
- the number of experiments can be reduced in order to reach the desired zeta potential by using a dichotomy method to explore the range of possible concentrations.
- zeta potential measurements are carried out for the two extreme values of the range of concentrations (for example for the concentrations of 0.5 ppm and 50 ppm in tetravalent salt (s) ( s)) and a median value (advantageously the median value is chosen by considering a logarithmic scale).
- the aqueous solution may further contain at least one surfactant.
- the surfactant is chosen from anionic surfactants or a mixture of anionic surfactants containing in particular a sulphonate surfactant, such as an alkylbenzosulphonate (called ABS), an internai olefin sulphonate (called IOS ), an alkyl glyceryl ether sulfonate (AGES) or an alkyl ether sulfate (AES), a carboxy- or sulfobetaine.
- ABS alkylbenzosulphonate
- IOS internai olefin sulphonate
- IOS internai olefin sulphonate
- AES alkyl glyceryl ether sulfonate
- carboxy- or sulfobetaine such as an alkylbenzosulphonate (called IOS), an internai olefin sulphonate (called
- the present invention improves the effectiveness of flotation even in the case where the aqueous solution to be treated comprises a surfactant.
- the tetravalent salt is a zirconium salt, such as a zirconium chloride, a zirconium sulphate, a zirconium hydroxide or a zirconium acetate.
- zirconium salts such as a zirconium chloride, a zirconium sulphate, a zirconium hydroxide or a zirconium acetate.
- the zirconium salt is zirconium chloride.
- This salt has the advantage of having a low environmental impact. However, this salt can however cause some corrosion of metals depending on its concentration.
- at least one anti-corrosion agent can be injected simultaneously with the solution into zirconium chloride. aqueous.
- the process according to the invention may further comprise a step of treating the gas resulting from a primary separation of the phases, carried out by means of, for example, a gravitational type separation, by centrifugation or by hydrocyclone.
- the treatment method according to the invention applied to a petroleum effluent may comprise a first stage of primary phase separation, carried out by means of, for example, a gravitational type separation, by centrifugation or by hydrocyclone.
- the treatment method according to the invention applied to a petroleum effluent may comprise oil treatment steps, such as dehydration, desalting, etc. stages.
- samples are prepared of an aqueous solution reproducing a water of production having a watercut of 99.95% according to the following protocol: 100 ml of a brine composed of 7.5 g / L are prepared of NaCl and 1% by weight of Triton X405. Then 45 ml are poured into a beaker. The solution is stirred at 13,500 rpm using an Ultra-Turrax (IKA model T25D (digital) with S25N-18G blade) and 105 ml of VEMO oil are added. The emulsion remains stirred for 5 minutes at 13,500 rpm.
- IKA model T25D digital
- the column has three taps that take samples to track process performance over time.
- Flotation is carried out by air injection for all the examples, the air coming from a compressed air network.
- the desired air flow rate is set at 40l / h using a Kobold® rotameter equipped with a valve and a float.
- the gas injection is through a glass sinter with a diameter of 6 cm and a porosity of 17-40 ⁇ m.
- the seal between the sintered support and the column is provided by rubber seals and a steel collar.
- the bubbles generated are millimetric.
- a production water sample as described above is introduced into the flotation column. Before introducing the gas into the column, the exact initial concentration Cinit is determined in the production water. Samples at different times are then taken at the bottom of the column and the residual oil concentration is determined by extraction with dichloromethane and determination by UV-visible spectrophotometry.
- the first example is implemented from two production water samples manufactured as described above.
- Figure 1 shows the evolution of the Ct / Cinit ratio as a function of the time (t) of injection of the gas into the flotation cell (or in other words the evolution of the water quality) for each of these experiments.
- the lower the Ct / Cinit ratio the better the effectiveness of the flotation treatment, and conversely, the closer this ratio is to 1, the less efficient this is.
- the efficiency of the process of Flotation according to the prior art is low. Indeed, after 10 min of flotation, only 36% of the oil was separated from the aqueous phase present in the production water.
- the prior injection of the zirconium chloride according to the invention allows a very clear improvement of the efficiency of the flotation, since the water becomes clean (Ct / Cinit ⁇ 0.05) for times of the order. 6 minutes (see curve C2).
- This improvement in the efficiency of the flotation by the process according to the invention is explained by a reduction of the Zeta potential (in absolute value) in the presence of the zirconium salt, and therefore to a reduction of the electrostatic repulsions between the drop of oil and the air bubble, which allows the adhesion of oil drops on the air bubbles and thus their rise to the surface faster.
- the second example is implemented from a series of nine production water samples manufactured as described above.
- FIG. 3 also shows the evolution of the Ct / Cinit ratio as defined in Example 1 as a function of time, in the case where no tetravalent salt is injected into the production water (curve C1), and in the case where a zirconium chloride is added to the aqueous solution in a concentration equal to 0.5 ppm (curve C2). It can be seen in this figure that the addition of the zirconium salt at this concentration makes it possible to greatly improve the efficiency of the flotation.
- SDBS sodium dodecyl benzene sulfonate
- Figure 4 shows the evolution of the Ct / Cinit ratio as a function of time, in the case where no tetravalent salt is injected into the production water (curve C1), and in the case where the zirconium chloride is injected in a concentration equal to 13 ppm (curve C2). It can thus be observed a very strong improvement in the effectiveness of flotation in the presence of zirconium, even when the production water contains a surfactant.
Landscapes
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Physical Water Treatments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1761896A FR3074796B1 (fr) | 2017-12-11 | 2017-12-11 | Procede de traitement par flottation d'une solution aqueuse issue d'une production petroliere |
PCT/EP2018/080980 WO2019115107A1 (fr) | 2017-12-11 | 2018-11-12 | Procede de traitement par flottation d'une solution aqueuse issue d'une production petroliere |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3724131A1 true EP3724131A1 (fr) | 2020-10-21 |
Family
ID=61187503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18796976.1A Withdrawn EP3724131A1 (fr) | 2017-12-11 | 2018-11-12 | Procede de traitement par flottation d'une solution aqueuse issue d'une production petroliere |
Country Status (6)
Country | Link |
---|---|
US (1) | US20200361788A1 (fr) |
EP (1) | EP3724131A1 (fr) |
CA (1) | CA3082215A1 (fr) |
CO (1) | CO2020006623A2 (fr) |
FR (1) | FR3074796B1 (fr) |
WO (1) | WO2019115107A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4168229A (en) * | 1974-10-14 | 1979-09-18 | Imperial Chemical Industries Limited | Removal of oil from an oil in water emulsion |
US4348287A (en) * | 1981-05-26 | 1982-09-07 | Petrolite Corporation | Zirconium compounds as flotation aid |
BE1006909A3 (fr) * | 1993-04-24 | 1995-01-24 | Leduc Ets | Procede et dispositif d'epuration d'une solution ou emulsion aqueuse d'une substance determinee. |
US8658574B2 (en) * | 2008-08-29 | 2014-02-25 | Schlumberger Technology Corporation | Treatment and reuse of oilfield produced water for operations in a well |
-
2017
- 2017-12-11 FR FR1761896A patent/FR3074796B1/fr not_active Expired - Fee Related
-
2018
- 2018-11-12 US US16/771,008 patent/US20200361788A1/en not_active Abandoned
- 2018-11-12 WO PCT/EP2018/080980 patent/WO2019115107A1/fr unknown
- 2018-11-12 CA CA3082215A patent/CA3082215A1/fr active Pending
- 2018-11-12 EP EP18796976.1A patent/EP3724131A1/fr not_active Withdrawn
-
2020
- 2020-05-29 CO CONC2020/0006623A patent/CO2020006623A2/es unknown
Also Published As
Publication number | Publication date |
---|---|
US20200361788A1 (en) | 2020-11-19 |
CO2020006623A2 (es) | 2020-08-21 |
CA3082215A1 (fr) | 2019-06-20 |
FR3074796B1 (fr) | 2021-01-29 |
FR3074796A1 (fr) | 2019-06-14 |
WO2019115107A1 (fr) | 2019-06-20 |
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