CN115925051A - Hybrid system and method for treating produced water and seawater to be reinjected into subsea oil reservoirs - Google Patents
Hybrid system and method for treating produced water and seawater to be reinjected into subsea oil reservoirs Download PDFInfo
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- CN115925051A CN115925051A CN202310031004.5A CN202310031004A CN115925051A CN 115925051 A CN115925051 A CN 115925051A CN 202310031004 A CN202310031004 A CN 202310031004A CN 115925051 A CN115925051 A CN 115925051A
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- 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
- B01D61/18—Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The present invention relates to a water treatment system for producing and treating seawater for secondary recovery in oil wells. The present invention provides a hybrid system for treating produced water and seawater for reinjection into an offshore oil reservoir and a related hybrid water treatment method. The water to be treated is directed to a treatment module (20) comprising a microfiltration/ultrafiltration membrane or to a water treatment module comprising a nanofiltration membrane, depending on the quality of the water in relation to the content of oil and solids or the sulfate ion content. The system and method of the present invention allows for the re-injection of produced water without the need for additional treatment systems on the platform. Other advantages of the invention include reduced offshore oil handling and reduced installation, operation and maintenance costs associated with additional systems at the offshore installation.
Description
The application is a divisional application of a Chinese patent application with an application date of 2017, 7, 19 and 201780057450.6 entitled "hybrid system and method for treating produced water and seawater to be reinjected into a subsea oil reservoir".
Technical Field
The invention relates to a water treatment system in an offshore oil production device. More particularly, the present invention relates to a treatment system for produced water and seawater for use in secondary recovery at an oil well.
Background
It is known that in offshore oil installations one of the techniques used for secondary oil recovery is the injection of treated seawater. In this context, it is known that seawater contains a large amount of sulfate ions (SO) 4 -2 ) And about 2800mg/L. When seawater is injected into the formation water (homologous water) it contains enough barium (Ba) in solution +2 ) Strontium (Sr) +2 ) Or calcium (Ca) 2+ ) Ionic terrain, the contact of the two fronts often causes their sulfate: barium sulfate (BaSO) 4 ) Strontium sulfate (SrSO) 4 ) Or calcium sulfate (CaSO) 4 ) Precipitation occurs. These salts are very insoluble and the precipitated salts plug the wellbore causing formation damage. They also precipitate in the production lines and in the plant equipment.
Depending on the barium and strontium content of the formation water, it may be necessary to configure a sulfate removal Unit (URS) for treatment of seawater to be injected into the reservoir, as shown in fig. 1. In URS, nanofiltration membranes (which may be ceramic or polymeric) are used to remove sulphate ions from seawater. Because seawater has solid particles as well as marine plant and animal components, it is necessary to install a filter upstream of the URS unit to improve its performance. The filtration is initially carried out with a coarse filter and subsequently with a cartridge filter of smaller flow diameter.
In URS, water permeates through the nanofiltration membrane and a portion (typically 25%) is concentrated in sulphate ions and separated for future disposal into the ocean. To achieve the design specifications for sulfate ions in the treated water, two sets of membranes were used in parallel, followed by a third set in series, according to the diagram of fig. 2.
Once the water is treated with the URS, the necessary specifications are obtained and can be injected into the oil reservoir for secondary recovery.
Furthermore, it is further known to treat produced water arriving at the treatment unit to remove oil droplets. Conventional techniques for this type of processing have a general and simplified form of construction as shown in fig. 1.
Specifically, the produced water is subjected to treatment processes to separate the aqueous phase from the oil phase, which include gravity separation, hydrocyclone and float separation, and then disposed of as prescribed in the ocean according to current environmental regulations. Water that is not specified for disposal on some platforms may be directed to a tank called an "off-the-shelf tank" where it takes longer to separate the oil phase, and in some cases may be reprocessed in the processing facility.
However, such produced water treatment devices have reduced oil droplet and solid particle removal efficiencies of less than 5.0 μm. Such conditions limit the overall efficiency of the treatment and therefore obtain an effluent stream having characteristics suitable for more restrictive reservoirs in terms of suspended solids content, oil and grease. So after treatment, due to the content of suspended solids, oil and grease, the produced water is regulated for disposal in the ocean and is regulated not to be re-injected.
In this way, the only destination of produced water after treatment in offshore oil production facilities is disposal today. Inefficiencies in conventional water-producing processing equipment used to achieve the required solids and oil content in accordance with re-injection into more restrictive reservoirs, among other factors, render such re-injection impractical. Therefore, in recent secondary recycling schemes, such options are still ignored.
However, it is noted that the development of treatment systems allowing the re-injection of produced water is a very attractive option for the field of oil production, mainly due to the trend of environmental regulations becoming increasingly strict, and to the tendency to increase the sustainability of industrial practices in this field of action.
In this sense, microfiltration/ultrafiltration membrane separation techniques (using ceramic membranes) have proven to be a interesting option for this challenge, as when applied to the treatment of produced water, water with low oil and solids content is produced.
In microfiltration/ultrafiltration membrane separation processes, as is known in the art, water permeates the membrane, while a portion of the supplied volume accumulates the non-permeated oil and is returned to the system in a recycled form.
Shams et al, entitled "Ceramic Ul tra-and Nanofi trat ion Membranes for Oi lfield Produced Water Treatment: a Mini Review "discloses a Review study on the use of microfiltration/ultrafiltration ceramic membranes to treat produced water (to remove solids and oil particles). Several techniques using microfiltration/ultrafiltration ceramic membranes are proposed in this scientific paper and their description is hereby incorporated by reference.
A paper entitled "evaluation of membranes for the treatment of produced water" by Weschenfelder, si lvio e. Et al (one of the inventors of the present invention) discloses a study that evaluates the performance of membranes for treating produced water by long-term testing using real effluent, taking into account the formation of permeate flow and the characteristics of the effluent produced. The results show thatUsing a membrane with a pore size equal to 0.1mm, a solid content of less than 1mg L can be obtained -1 The content of the mixed oil and oil is 1-3mg L -1 The permeate stream of (a). Furthermore, this document discloses that using a chemical regeneration method, it is possible to restore 95% of the initial permeability of the microfiltration/ultrafiltration ceramic membrane. The disclosure of this document is also incorporated herein by reference.
In the current scenario, if it is determined that the re-injection can be achieved by supplementing the treatment of conventional produced water using microfiltration/ultrafiltration membrane separation methods, additional systems will be required, for example in the treatment plant, as described in the above-mentioned prior art documents. This entails significantly higher configuration, operation and maintenance costs and greater operational difficulties, as well as greater weight and footprint on the platform.
Thus, it is apparent that the prior art lacks a produced water treatment system that allows for re-injection without the need for additional treatment systems as known in the prior art.
As will be better described below, the present invention seeks to solve the above-mentioned problems of the prior art in a practical, efficient and cost-effective manner.
Disclosure of Invention
It is a primary object of the present invention to provide a hybrid system and method for treating seawater and production that allows for re-injection of produced water without the need for additional treatment systems on the platform.
To achieve the above object, the present invention provides a hybrid system for treating produced water and seawater for re-injection into an offshore oil reservoir comprising (i) at least one inlet for water to be treated, (ii) at least two microfiltration/ultrafiltration water treatment modules, each module comprising (i-a) at least one set of microfiltration/ultrafiltration membranes for removing oil and solids from the water to be treated, or (i-b) at least one set of nanofiltration membranes for removing sulfate ions from the water to be treated, (ii) at least one outlet for treated water, wherein the volume of water to be treated is directed to a water treatment module comprising microfiltration/ultrafiltration membranes or to a water treatment module comprising nanofiltration membranes depending on the quality of the water with respect to the sulfate oil and solids content or the sulfate ion content.
The present invention further provides a hybrid process for treating produced water and seawater for reinjection into an offshore oil reservoir, comprising essentially the steps of: (i) Directing the water to be treated to a water treatment module comprising at least one set of microfiltration/ultrafiltration membranes for removing oil and solids from the water to be treated, or (i) directing the water to be treated to a water treatment module comprising at least one set of nanofiltration membranes for removing sulfate ions from the water to be treated, wherein the volume of water to be treated is directed to a water treatment module comprising microfiltration/ultrafiltration membranes or to a water treatment module comprising nanofiltration membranes, depending on the quality of the water with respect to oil and solids content or sulfate ion content.
Drawings
The embodiments presented below relate to the figures and their respective reference numerals.
Fig. 1 shows a schematic diagram of a seawater treatment system and for injecting and disposing of produced water, respectively, as known in the art.
Fig. 2 shows a schematic of an example of seawater treatment for injection into an oil reservoir by a sulphate removal Unit (URS), as known in the art.
Fig. 3 shows a schematic diagram of a treatment module comprising a nanofiltration or microfiltration/ultrafiltration membrane according to a preferred embodiment of the invention.
Fig. 4 shows a schematic diagram of a hybrid seawater treatment system and one of the produced waters for reinjection, according to a preferred embodiment of the present invention.
Figure 5 shows a schematic of a complete system for treating seawater and for reinjecting produced water that incorporates the hybrid system of the present invention.
Detailed Description
In the foregoing, it will be appreciated that the following description may deviate from the preferred embodiments of the present invention. It will be apparent to those skilled in the art, however, that the invention is not limited to the specific embodiments.
Fig. 4 shows a simplified schematic diagram of a hybrid seawater treatment system and for further reinjection of produced water, according to a preferred embodiment of the present invention. The figure essentially comprises two inlets for water to be treated, i.e. one is produced water inlet 2 with a high content of oil and solids and one is seawater inlet 4 with a high content of sulphate ions.
The produced water is preferably stored in at least one tank 10 prior to being directed for disposal or treatment by the hybrid system of the present invention.
Preferably the seawater collected for treatment and subsequent injection passes through a series of filters, the first filter being provided with a filter element having a coarse mesh and followed by a filter element provided with a fine mesh. Preferably, the first filter 12 rejects particles to 500 μm, the second filter 14 rejects particles to 25 μm and the third filter rejects particles to 5 μm.
Preferably both the produced water and the collected seawater each reach at least one manifold 18 comprised of a plurality of water control valves which converge into each of the treatment modules 20.
Each treatment module 20 contains at least one suitable set of microfiltration/ultrafiltration membranes (ceramic membranes) to remove oil and solids from the produced water, or at least one set of nanofiltration membranes (ceramic or polymer membranes) employed to remove sulfate ions from seawater. Thus, at least one header 18 directs produced water through its control valves to the module containing the microfiltration/ultrafiltration membranes and draws seawater out into the module containing the nanofiltration membranes. Preferably the at least one header is subdivided into two headers, one for controlling the inlet of produced water in the module containing the microfiltration/ultrafiltration membrane and the other for controlling the seawater entering the module containing the nanofiltration membrane.
Preferably at least one header 18 is fluidly connected to two inlet pipes for water to be treated, i.e. one for produced water 2 and one for seawater 4. These inlet ducts are each subdivided into a plurality of parallel secondary ducts for the secondary ducts of each processing module. Before entering each treatment module 20, secondary conduits of produced water and seawater flow into a single inlet conduit from each module downstream of each control valve.
The control valves are located upstream of each treatment module 20 such that each valve controls the entry of one type of water to be treated, i.e. produced water or seawater from each secondary conduit.
Preferably, there is no mixing between the produced water and the seawater prior to entering the treatment module 20. That is, if the produced water inlet control valve is opened, the seawater inlet control valve should preferably be closed.
Preferably, each treatment module 20 contains only one type of membrane, i.e., nanofiltration or microfiltration/ultrafiltration. It is therefore preferred that if a particular process module 20 contains only nanofiltration membranes, only seawater is directed thereto, with the inlet control valve for the produced water being closed. Likewise, the produced water will be directed to a treatment module 20 containing only microfiltration/ultrafiltration membranes.
Each treatment module 20 is designed to allow for interchangeability between nanofiltration and microfiltration/ultrafiltration membranes. In other words, each module may replace its nanofiltration membrane with microfiltration/ultrafiltration (or vice versa) depending on the treatment requirements of each water.
By way of example, it will be appreciated that shortly after the practice of the hybrid system of the present invention, seawater will only need to be treated by nanofiltration membranes, as there will still be no produced water. Thus, virtually all of the process modules 20 may be equipped with only nanofiltration membranes. As produced water is produced, the need for treatment of seawater is reduced. In that case, the nanofiltration membrane of the treatment module 20 is replaced with a microfiltration/ultrafiltration membrane.
Fig. 3 shows a schematic detail of a processing module 20 according to the invention. As noted, the treatment modules 20 may contain nanofiltration or microfiltration/ultrafiltration membranes depending on the type of water (produced water or seawater) that will pass through a particular module. Each module contains at least one set 20 of micro-/ultra-or nanofiltration membranes. Preferably, each module contains two sets of parallel membranes 20a,20b, followed by a third set of series membranes 20c, as in the URS of the prior art.
Preferably, where the treatment module 20 is provided with nanofiltration membranes, to remove sulphate ions from the seawater, the water to be treated is passed through the first two sets of parallel nanofiltration membranes so that the maximum portion of the treated volume of water becomes low in sulphate ion concentration and is sent for injection into the reservoir.
The remaining water concentrated by the sulfate ions of the first set of membranes is directed to a third set of membranes 20c in series with the first two sets. This third group treated this more concentrated water and also produced a larger fraction with a lower concentration of sulfate ions (which would be mixed with the water treated by the first two groups of membranes) and a smaller fraction with an extreme concentration of sulfate ions (which is typically discarded in the sea).
Water from the nanofiltration membrane bank treatment having a low sulfate ion concentration is used for injection into the reservoir, but may be subjected to additional treatment steps.
In the case of a treatment module 20 provided with a microfiltration/ultrafiltration membrane, the procedure is very similar to that described above in order to remove oil and solids from the produced water. Preferably the water to be treated passes through the first two sets of parallel membranes 20a,20b, so that the largest portion of the treated volume of water contains low concentrations of oil and solids, and is directed to be reinjected into the reservoir.
The remaining water, with the oil and solids concentrated, sent to the first set of membranes is directed to a third set of membranes 20c in series with the first two sets. This third group treated this more concentrated water and also produced a larger fraction with a lower concentration of oil and solids (which would mix with the water treated by the first two groups of membranes). Water with low concentrations of oil and solids from all three sets of microfiltration/ultrafiltration membranes was used for re-injection into the reservoir.
Each treatment module 20 may contain more or fewer series and/or parallel membrane modules depending on the quality of the water to be treated. Therefore, it is noted that the present invention is not limited to the membrane module configuration shown in fig. 3.
Still in the case of a treatment module 20 provided with microfiltration/ultrafiltration membranes, a smaller fraction of the oil and solids concentration from the third set of membranes 20c may be directed to the inlet of the treatment module 20, as shown in fig. 3.
Alternatively, as shown in fig. 5 (full view of the offshore unit), the oil and solids-enriched water (oil recycle) may be sent to a water treatment system to separate the oil phase. Preferably, the oil and solids-enriched water may be sent to a number of treatment tanks, as shown in FIG. 5 (treatment tank 24). This tank may, for example, be an off-spec tank that has typically been used in produced water treatment facilities. Alternatively, additional tanks may be provided to perform this step in addition to the off-spec tanks.
Optionally, at least one water outlet is provided in the lower portion of the treatment tank 24 to withdraw water with a low concentration of oil, which will concentrate at the top after a period of time, because the oil is less dense than water. The water drawn through the water outlet in the lower portion of the treatment tank 24, which has a relatively low or medium concentration of oil, can be discarded (if specified) or directed to a hybrid treatment system according to the present invention, where it will be sent to a treatment module 20 containing microfiltration/ultrafiltration membranes for new treatment to remove oil and solids. After some water is removed, the oily concentrate remaining in the treatment tank 24 is preferably directed to the oil water separation system 23 to utilize the produced oil. This facilitates minimization of oil discharge into the sea and better utilization of the oil present in the produced water in the overall production of the well.
The invention further provides the possibility of carrying out a backwashing procedure on the membranes used in the treatment module, in particular microfiltration/ultrafiltration membranes. Such a procedure may be performed, for example, by a pump (not shown) or by manipulating timed valves in the treated water lines and the feed lines of each group. This procedure allows the flow in the membrane to be periodically reversed, cleaned and its performance maintained.
Optionally, at least a first degasser unit 28 is provided upstream or downstream of the process module 20 for seawater degassing prior to reinjection into the reservoir, if desired.
The present invention further provides a hybrid process for treating produced water and seawater for reinjection into an offshore reservoir, comprising essentially the steps of:
a) Directing the water to be treated to a water treatment module comprising at least one set of microfiltration/ultrafiltration membranes for removing oil and solids from the water to be treated; or
b) Directing the water to be treated to a water treatment module comprising at least one set of nanofiltration membranes for removing sulphate ions from the water to be treated, wherein the volume of water to be treated is directed to a water treatment module comprising microfiltration/ultrafiltration membranes or a water treatment module comprising nanofiltration membranes, depending on the quality of the water with respect to oil and solids content or sulphate ion content.
It is further emphasized that all of the processing steps detailed herein are applicable to both the system and method of the present invention.
Thus, based on the above description, the present invention provides a system and method for treating seawater and production that allows for re-injection of produced water without the need for additional treatment systems on the platform. Still further advantages are achieved by the present invention, such as reduced offshore oil disposal by more efficient treatment of produced water, and reduced installation, operation and maintenance costs associated with additional systems at offshore installations.
Numerous variations are possible which relate to the scope of protection of the invention. Therefore, the fact that the present invention is not limited to the specific settings/embodiments described above is emphasized.
In particular, the invention also relates to the following items:
item 1. A hybrid system for treating produced water and seawater to be reinjected into an offshore oil reservoir, characterized by comprising:
at least one inlet for water to be treated;
at least two processing modules (20), each module comprising:
at least one set of microfiltration/ultrafiltration membranes (20a, 20b, 20c) for removing oil and solids from water to be treated; or alternatively
At least one set of nanofiltration membranes (20a, 20b, 20c) for removing sulfate ions from the water to be treated; and
at least one outlet for treated water, wherein the volume of water to be treated is directed to a treatment module (20) comprising a microfiltration/ultrafiltration membrane or to a water treatment module comprising a nanofiltration membrane, depending on the quality of the water content with respect to oil and solids content or sulfate ion content.
Item 3. The system according to item 1 or 2, characterized in that each processing module (20) comprises at least one set of membranes (20 c) in series with the other sets of membranes (20a, 20b).
Item 4. The system according to any of items 1 to 3, characterized in that the at least one inlet for water to be treated comprises two inlets for water, i.e. one inlet (2) for produced water and one inlet (4) for seawater.
Item 5. The system according to item 4, characterized in that it further comprises at least one header (18) provided with a plurality of valves for controlling the type of water entering each water treatment module (20), i.e. produced water or sea water.
Item 6. The system according to item 5, characterized in that said inlet ducts (2, 4) are each subdivided into a plurality of parallel secondary ducts, one for each processing module (20).
Item 7. The system according to any of items 1 to 6, characterized in that each treatment module (20) comprises only one type of membrane, i.e. nanofiltration or microfiltration/ultrafiltration.
Item 8. The system according to any of items 1 to 7, characterized in that the membrane of each processing module (20) is interchangeable with another type of membrane.
Item 9. The system according to any of items 1 to 7, characterized in that it additionally comprises at least one water treatment tank (24) for separating the aqueous phase from the oil phase by density difference.
Item 11. The system according to item 9 or 10, characterized in that the water treatment tank (24) is furthermore in fluid communication with at least one outlet for marine waste treatment and a water inlet conduit for separation of water and oil.
directing the water to be treated to at least one water treatment module (20) comprising at least one set of microfiltration/ultrafiltration membranes for removing oil and solids from the water to be treated; or
Directing the water to be treated to at least one treatment module (20) comprising at least one set of nanofiltration membranes for removing sulphate ions from the water to be treated,
wherein the volume of water to be treated is directed to at least one treatment module (20) comprising a microfiltration/ultrafiltration membrane or to at least one water treatment module comprising a nanofiltration membrane depending on the type of water to be treated, i.e. produced water or seawater.
Item 13. The method according to item 12, characterized in that the step of directing the water to be treated to a treatment module (20) further comprises treating the water by at least two sets of parallel membranes (20a, 20b).
Item 15. The method according to any of items 12 to 14, characterized in that the water to be treated is produced water concentrated in oil and solids and seawater concentrated in sulfate ions.
Item 17. The method according to any of items 12 to 16, characterized in that it further comprises the steps of: the concentrated water fraction of the oil and solids is directed from at least one treatment module (20) containing at least one set of micro-membranes/ultrafiltration to at least one treatment tank (24).
Item 19. The method of item 18, characterized in that it further comprises the steps of: the separated aqueous phase is discharged through at least one water outlet provided in the lower part of the treatment tank (24).
Item 21. The method according to any of items 18 to 20, characterized in that it further comprises the steps of: after the aqueous phase discharge step, the remaining oily concentrate in the treatment tank (24) is directed to a water and oil separation system (23).
Item 22. The method according to any of items 14 to 24, characterized in that it further comprises at least one step of: the treated water is degassed by at least one degasser unit (28).
Claims (17)
1. A hybrid system for treating produced water and seawater for reinjection into an offshore oil reservoir, characterized by comprising:
at least one inlet for water to be treated, having a produced water inlet (2) and a seawater inlet (4);
at least one header (18) provided with a plurality of valves;
at least two processing modules (20), each module comprising:
at least one set of microfiltration/ultrafiltration membranes (20a, 20b, 20c) adapted to remove oil and solids from the produced water to be treated; and
at least one set of nanofiltration membranes (20a, 20b, 20c) adapted to remove sulfate ions from the seawater to be treated,
wherein the microfiltration/ultrafiltration membrane assembly membrane (20a, 20b, 20c) and the nanofiltration membrane assembly membrane (20a, 20b, 20c) are interchangeable; and
at least one outlet for treated water,
wherein the water to be treated is directed through at least one header (18), the at least one header (18) directing the produced water stream to a treatment module (20) comprising a microfiltration/ultrafiltration membrane or directing the seawater stream to a treatment module (20) comprising a nanofiltration membrane,
the at least one header is subdivided into two headers, one for controlling the produced water to enter the module comprising the microfiltration/ultrafiltration membrane and the other for controlling the seawater to enter the module comprising the nanofiltration membrane, and
there is no mixing between the produced water and the seawater before entering the treatment module (20), an
Each treatment module (20) comprises only one type of membrane, i.e. nanofiltration or microfiltration/ultrafiltration, and
shortly after implementation of the hybrid system, the seawater will only need to be treated by nanofiltration membranes, and as produced water is produced, the nanofiltration membranes of the treatment module (20) are replaced with microfiltration/ultrafiltration membranes.
2. The system according to claim 1, characterized in that each processing module (20) comprises at least two sets of membranes (20a, 20b) in parallel.
3. The system according to claim 1 or 2, characterized in that each processing module (20) comprises at least one set of membranes (20 c) in series with the other sets of membranes (20a, 20b).
4. System according to claim 1, characterized in that each inlet duct (2, 4) is subdivided into a plurality of parallel secondary ducts, one for each processing module (20).
5. System according to claim 1, characterized in that it additionally comprises at least one water treatment tank (24) adapted to separate the aqueous phase from the oil phase by means of a density difference.
6. The system of claim 5, characterized in that the water treatment tank (24) is in fluid communication with at least two treatment modules (20) downstream and upstream thereof to complete a cycle.
7. System according to claim 5 or 6, characterized in that the water treatment tank (24) is furthermore in fluid communication with at least one outlet for offshore disposal and one inlet conduit for produced water separated between water and oil.
8. A hybrid method for treating produced water and seawater for re-injection into an offshore oil reservoir, the method using the system defined in claim 1, characterized in that the method comprises the steps of:
directing the water to be treated to at least one water treatment module (20) comprising at least one set of microfiltration/ultrafiltration membranes adapted to remove oil and solids from the produced water to be treated; or
Directing the water to be treated to at least one treatment module (20) comprising at least one set of nanofiltration membranes adapted to remove sulphate ions from the seawater to be treated; and
backwashing the membranes of at least one treatment module (20) by reversing the flow of water therein,
wherein the water to be treated is directed through at least one header (18), the at least one header (18) directing the produced water stream to a treatment module (20) comprising a microfiltration/ultrafiltration membrane or directing the seawater stream to a treatment module (20) comprising a nanofiltration membrane.
9. A method according to claim 8, characterized in that the step of directing the water to be treated to the treatment module (20) further comprises treating the water by at least two sets of membranes (20a, 20b) in parallel.
10. A method according to claim 8 or 9, characterised in that the step of directing the water to be treated to the treatment module (20) further comprises treating the water by at least one set of membranes (20 c) in series with the other sets of membranes (20a, 20b).
11. A method according to claim 8 or 9, characterized in that the water to be treated is produced water concentrated with oil and solids and seawater concentrated with sulphate ions.
12. Method according to claim 8 or 9, characterized in that it further comprises the step of: a portion of the oil and solids-enriched water is directed from at least one treatment module (20) containing at least one set of micro/ultrafiltration membranes to at least one treatment tank (24).
13. Method according to claim 12, characterized in that it further comprises the step of: the less thick oil phase is separated from the thicker water phase by a density difference in a given period of time in a treatment tank (24).
14. The method as recited in claim 13, characterized in that it further comprises the step of: the separated aqueous phase is discharged through at least one water outlet provided in the lower part of the treatment tank (24).
15. Method according to claim 14, characterized in that it further comprises the step of: the discharged aqueous phase is directed for offshore disposal or to at least one treatment module (20).
16. Method according to claim 13, characterized in that it further comprises the step of: after the aqueous phase discharge step, the remaining oily concentrate in the treatment tank (24) is directed to a water and oil separation system (23).
17. Method according to claim 13, characterized in that it further comprises at least one step of: the treated water is degassed by at least one degasser unit (28).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR102016016758-2 | 2016-07-20 | ||
| BR102016016758-2A BR102016016758B1 (en) | 2016-07-20 | HYBRID SYSTEM AND PROCESS FOR TREATMENT OF PRODUCED WATER AND SEA WATER FOR REINJECTION IN SUBMARINE OIL RESERVOIR | |
| CN201780057450.6A CN109963814A (en) | 2016-07-20 | 2017-07-19 | For handling the hybrid system and method for the recovered water and seawater that refill in the oil reservoir of seabed |
| PCT/BR2017/000076 WO2018014096A1 (en) | 2016-07-20 | 2017-07-19 | Hybrid system and method for treating produced water and sea water to be re-injected into a subsea oil reservoir |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780057450.6A Division CN109963814A (en) | 2016-07-20 | 2017-07-19 | For handling the hybrid system and method for the recovered water and seawater that refill in the oil reservoir of seabed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115925051A true CN115925051A (en) | 2023-04-07 |
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| CN201780057450.6A Pending CN109963814A (en) | 2016-07-20 | 2017-07-19 | For handling the hybrid system and method for the recovered water and seawater that refill in the oil reservoir of seabed |
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| CN116177794B (en) * | 2023-02-01 | 2024-04-09 | 大庆市普罗石油科技有限公司 | Single well produced liquid reinjection skid-mounted device and produced liquid treatment method |
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| BR8606369A (en) * | 1986-12-22 | 1988-07-12 | Petroleo Brasileiro Sa | IMPROVEMENT IN EQUIPMENT AND PROCESS FOR OBTAINING OIL, GAS AND BY-PRODUCTS FROM PIROBETUMINOUS SHALES AND OTHER MATERIALS IMPREGNATED WITH HYDROCARBONS |
| JPH08309351A (en) * | 1995-05-18 | 1996-11-26 | Nitto Denko Corp | Waste water treatment apparatus |
| US6955222B2 (en) * | 2000-08-07 | 2005-10-18 | Ge Osmonics, Inc. | Method for secondary oil recovery |
| EA025116B1 (en) * | 2010-01-14 | 2016-11-30 | Бп Эксплорейшн Оперейтинг Компани Лимитед | Process of supplying water of controlled salinity |
| CN102701504B (en) * | 2012-06-18 | 2013-12-04 | 中国海洋大学 | Method for preparing polymer solution for oil displacement of oil field |
| EP2692417A1 (en) * | 2012-07-31 | 2014-02-05 | Hydration Systems, Llc | Organic forward osmosis system |
| MY171783A (en) * | 2012-08-09 | 2019-10-29 | Shell Int Research | System for producing and separating oil |
| EP2730548A1 (en) * | 2012-11-13 | 2014-05-14 | CWT Clear Water Technologies GmbH | Purification of water soiled with oil, creation of process water, crude oil production and/or refining |
| CN102942282B (en) * | 2012-12-04 | 2014-06-18 | 中国海洋大学 | Preparation method of water used for oilfield flooding, water flooding and water gathering |
| US20160214878A1 (en) * | 2013-09-13 | 2016-07-28 | General Electric Company | Treatment of produced water for supercritical dense phase fluid generation and injection into geological formations for the purpose of hydrocarbon production |
| CN103601314B (en) * | 2013-11-01 | 2015-09-23 | 贵阳时代沃顿科技有限公司 | A kind of utilize seawater to produce oil field reinjection water treatment system and technique |
| KR20150085990A (en) * | 2014-01-17 | 2015-07-27 | 코웨이 주식회사 | Water and wastewater treatment system and metho of the same |
| CA2958739C (en) * | 2014-10-15 | 2022-08-30 | Snf Sas | Chemically enhanced oil recovery method using viscosity-increasing polymeric compounds |
| CN104817134A (en) * | 2015-03-26 | 2015-08-05 | 中国海洋大学 | Full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis |
| BR102015033000B1 (en) * | 2015-12-30 | 2019-05-07 | General Electric Company | SUBMARINE GAS / LIQUID-SEPARATION SYSTEM AND METHOD |
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