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WO2017007330A1 - Système de traitement mécanique de l'eau boueuse et procédé d'utilisation de celui-ci - Google Patents

Système de traitement mécanique de l'eau boueuse et procédé d'utilisation de celui-ci Download PDF

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Publication number
WO2017007330A1
WO2017007330A1 PCT/NO2016/050137 NO2016050137W WO2017007330A1 WO 2017007330 A1 WO2017007330 A1 WO 2017007330A1 NO 2016050137 W NO2016050137 W NO 2016050137W WO 2017007330 A1 WO2017007330 A1 WO 2017007330A1
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WO
WIPO (PCT)
Prior art keywords
decanter
water phase
water
treatment system
separator
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
PCT/NO2016/050137
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English (en)
Inventor
Oluf BERGSVIK
Glenn ÅSLAND
Jan Erik TVETERAAS
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.)
SOILTECH AS
Original Assignee
SOILTECH AS
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Filing date
Publication date
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Application filed by SOILTECH AS filed Critical SOILTECH AS
Publication of WO2017007330A1 publication Critical patent/WO2017007330A1/fr
Priority to SA517390649A priority Critical patent/SA517390649B1/ar
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • B01D17/0217—Separation of non-miscible liquids by centrifugal force
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/065—Separating solids from drilling fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/262—Separation of sediment aided by centrifugal force or centripetal force by using a centrifuge
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • 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
    • 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
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/001—Upstream control, i.e. monitoring for predictive control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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

Definitions

  • the invention relates to a treatment system for mechanically purifying slop water, the treatment system comprises a decanter which includes at least an inlet for the slop water that is to be purified and an outlet for a water phase, a separator connected to the decanter downstream of the latter, and an analyser which includes an analyser unit placed upstream of the inlet of the decanter of the treatment system for determining the solids and oil content of the slop water. Further, the invention relates to a method for purifying slop water by means of the treatment system according to the invention.
  • the invention relates to a treatment system and a method for treating slop water on a drilling device for subsequent discharge to the sea or ground, the method being based exclusively on analyses of the slop water and a series of mechanical purification stages. Accordingly, the method is without the use of chemicals.
  • slop water liquid waste that is generated in connection with the recovery of petroleum, for example liquid waste from drilling, production and intervention operations.
  • the contents of the drilling waste vary according to the operation being carried out.
  • the drilling waste may consist of water contaminated with drilling fluid, oil-contaminated water, oil-contaminated brine, slop water, slop water with cement residues, liquid containing particles, liquid from drains and also rainwater, soapy water and similar liquids.
  • the particle content of the liquid drilling waste and its composition may vary greatly.
  • the slop-water treatment system described herein is suited for all the above-mentioned types of liquid waste. It must be understood that the terms "liquid drilling waste” and “slop water” may be used interchangeably herein and cover the great variety of wastewater described above.
  • the conventional handling of the drilling waste has been to transport the waste to a special location for treatment and destruction, or, alternatively, to inject the waste into a well that has been drilled for this purpose.
  • the challenge with respect to dis- charge to the sea or ground is to achieve a purity that meets the environmental requirements for the emission of oil into water.
  • a treatment unit which collects and treats liquid and sludge-like waste containing mineral oil is disclosed.
  • the treatment unit comprises four purification stages, the first stage of which comprises mechanical separation of the coarsest matter by the use of a shale shaker.
  • oil is separated and water liberated from the sludge in a three-phase decanter.
  • the third stage comprises settling of the last, suspended solids in sedimentation tanks.
  • an oil-binding additive is used to remove any remaining oil.
  • a drawback of known treatment processes is that even if they can result in a water phase that satisfies the requirements for emissions of oil into water, they may contain chemical additives, for the emission of which no requirements exist.
  • Another drawback is that the need for adding flocculation agents, for example, makes it necessary to store chemicals at the site.
  • Still another drawback of the prior art is so-called secondary waste generated by the use of chemicals, this secondary waste requiring further purification.
  • a further drawback of the prior art is that in processes in which, in the main, mechanical treatment is used there are often large, space-demanding systems that include sedimentation tanks, for example. This may be impractical, or impossible, to use on installations offshore because of limited space.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
  • the method provides for separating the slop water into three distinctive phases: particles, oil and water.
  • the water that is separated has an oil-in-water (OIW) purity that makes discharge into the sea or ground possible.
  • the purity requirements may vary somewhat from country to country, but today the purity requirement for discharge into water or ground in Norway is 30 ppm.
  • the system according to the invention may be adapted for different purity requirements and will preferably produce water which is cleaner than what is required by the emission requirements. For example, the system may produce water with a purity of less than 10 ppm of oil in water, for example 5 ppm of oil in water. In this way, cost-increasing and polluting transport of the slop water is avoided.
  • the invention relates more specifically to a treatment system for mechanically purifying slop water, the treatment system comprising :
  • decanter including at least an inlet for the slop water which is to be purified and an outlet for a water phase
  • an analyser including an analyser unit placed upstream of the inlet of the decanter of the treatment system for determining the solids and oil content of the slop water.
  • the treatment system is characterized by the analyser further including a second analyser unit downstream of the decanter for analysing the water phase coming out therefrom and by said analysis of said water phase determining whether the water phase will be returned for re-purification in the decanter or whether it will be passed on to the sepa- rator. If the water phase is passed on to the separator, the analysis of the water phase from the decanter determines the settings of the separator.
  • a decanter is a centrifuge that separates components of different densities.
  • a decanter can be used to separate, for example, two or three different components from each other, wherein these components may be solids, liquids or gases.
  • the decanter is preferably a three-phase decanter, that is to say a decanter which separates components of three different densities from each other, for example solids, oil and water.
  • An example of a three-phase decanter which can be used in the treatment system according to the invention is the Tri- canter® from the company Flottweg SE.
  • a separator works in a similar way to the decanter, the separator also being a centrifuge, but, in the main, separators handle liquids and finer solids and work at a higher rate of rotation than a decanter.
  • the liquid drilling waste referred to as slop water in what follows, will first be carried into the decanter which separates out the coarsest particulate material, an oil phase and a water phase.
  • the particulate material is carried to a collection receptacle for solids
  • the oil phase is carried to a collection receptacle for oil
  • the water phase is analysed to determine the residual amounts of solids and oil therein after the first round in the decanter.
  • a limit on how great an amount of solids can be tolerated in the water phase from the decanter for it to be allowed to be carried directly to the separator has been set in advance.
  • the separator is preferably a three-phase separator, that is to say a separator which is suitable for separating three phases from each other, such as solids and two liquids of different densities.
  • the analyser unit placed between the decanter and the separator that analyses the water phase from the decanter and that thus forms the basis for whether the water phase will be passed on to the separator or back to the decanter for a new round.
  • the analysis carried out in the analyser unit upstream of the decanter forms the basis for the settings of the decanter when new slop water is carried into it.
  • the treatment system according to the invention is a purely mechanical system and therefore no chemicals such as flocculants are used. Because of the optimized procedure of analysis with subsequent settings for the next stage of the purification process, the treatment system will be so effective that even without the use of chemicals the water that comes out of the last purification stage will be so clean that it may be discharged directly into the sea or ground. There are several reasons for it being an advantage not having to use chemicals; firstly, storing chemicals on board the platform is avoided. Secondly, the formation of an intermediate product or secondary waste consisting of flocculants to which both oil and water are bound, which in its turn must be transported to shore for purification, is avoided. Accordingly, as a consequence of not having to have this intermediate product, more clean water will come out of the process, and the residual products, particulate phase and oil phase, will be less voluminous.
  • the treatment system may further include a treatment device placed between the decanter and the separator for the further removal of particles and oil from the slop water.
  • the treatment system may be set up with different limit values, so that a solids content, and possibly the particle size, over a certain value indicate(s) return to the decanter, whereas there is then also a fringe range of solids content and/or particle size which indicates that the water phase should instead be directed into a further treatment device between the decanter and the separator.
  • the system may be adapted in such a way that the decision to carry the water phase into the treatment device between the decanter and the separator may also be based on other factors than particle content and particle size, for example oil in water, oil-particle size, heavy metals, minerals and so on. This depends on what type of treatment device is placed between the decanter and separator, and what it is meant to purify the slop water of.
  • the treatment device may be a filter package, which is a possible embodiment of the treatment system according to the invention.
  • the filter package may typically be arranged to remove a particular fraction of particulate material and maybe also oil or other contaminants in the water.
  • the treatment system may further include a further treatment device placed downstream of the separator for the further removal of particles and oil from the slop water.
  • the further treatment device may have been installed to either handle a specific range of particle sizes, purify the water phase of oil or other specific contaminants in the water, or a combination of these.
  • the further treatment device may be a filter package, which is a possible embodiment of the treatment system according to the invention.
  • the treatment system may further include a desalination unit. It is conceivable that instead of discharging the purified water directly from the separator, possibly from the further treatment device such as a filter package, into the sea or into the ground, it may be desirable to recycle the purified water for use aboard the installation at sea. If the water should desirably be used for purposes with particular requirements for purity, for example cleaning, personal hygiene or even drinking water, a salinity within given limits is required; for example, ideally, less than 500 ppm for freshwater.
  • the desalination unit may include a membrane for reverse osmosis.
  • Reverse osmosis is a known method of desalinating water, for example sea water, and will be well suited in the treatment system according to the invention.
  • the analyser may further include a third analyser unit downstream of the separator.
  • a third analyser unit downstream of the separator.
  • it In those cases in which it is considered to discharge the fully purified water directly into the sea or ground, it must first be analysed to find out whether the oil content, for example, is within the allowed limits. There may also be other factors than the oil content that are examined in such an analyser unit. If the oil content or other parameters have been found to exceed the given limit values, the water phase from the separator, possibly from the further treatment device downstream of the separator, may be returned for another round in the separator.
  • the analyser may include a computer system for automatically interpreting analyses from the analyser units and controlling the fluid flow in the treatment system.
  • the treatment system according to the invention can be automated, fully or partially, so that the different analyser units are connected to each other and to the decanter and the separator, and also the further treatment devices and the desalination unit if included in the system, via a SCADA system. In this way the system may be programmed and adjusted for the slop water on the installation in question.
  • the invention relates more specifically to a method for purifying slop water by the use of a treatment system according to a first aspect of the invention, the method including the following steps:
  • What is characteristic of the method is that it further includes the following steps: c) analysing the water phase that comes out of the decanter in the second analyser unit downstream of the decanter; and on the basis of the result of said analysis: either d) returning the water phase of the decanter to the decanter for re-purification with subsequent repetition of step c); or
  • the aim of the method according to the invention is to purify slop water in such a way that at the end of the process, the water that is separated in the purification process is at least so clean that it satisfies the requirement for purity for discharge directly into the sea or into the ground .
  • Analysing the slop water before it is carried into the decanter may be done continuously if the system is automated, for example. Alternatively, samples may be taken systematically, either manually or automatically, for example at given time intervals or on having passed a given volume of slop water. The frequency of analysis at the different analyser units of the system may be adjusted for the existing needs.
  • a decanter comprises a bowl and a scroll, wherein these are to be considered as two sleeves placed one inside the other.
  • the bowl and the scroll are arranged to rotate in opposite directions and at different speeds. Both the speed in general and the difference in speed between the bowl and the scroll are of importance for the purification process. They may be set on the basis of the solids content of the slop water. If there is a great amount of particles, it may be advantageous to have a lower speed difference than if there are few particles. In the same way, a lower general speed may be effective with a great proportion of coarse particles, whereas a higher general speed is more effective with finer particles.
  • solids, oil and a water phase will come out of the decanter.
  • the solids are carried to a receptacle, or a collection site, for solids, whereas the oil is correspondingly carried to a separate collection receptacle.
  • the separated water phase is analysed in a second analyser unit downstream of the decanter. Here it is determined, on the basis of predetermined criteria, whether the water phase will have to be returned for another round in the decanter or whether it is to be passed on to the separator. Since the composition of this water phase that comes out of the decanter varies, it will be appropriate to adjust the settings of the separator on the basis of the results of the analysis in the second analyser unit.
  • This second analyser unit thus has the effect of the system being optimized by the water phase from the decanter not being passed on, but being returned, if it is not suitable for the separator. Further, the sec- ond analyser unit has the effect, if the water phase is found to be in order for being passed on to the separator, of making the separator be set particularly with a view to the composition of exactly this water phase. In this way, the reliability and effectiveness of the system may be ensured. As an example it may be mentioned that if a water phase with a high solids content is passed on to the separator, there will be a risk of the separator jamming up or becoming plugged up, which will result in a stoppage. This is a relatively common problem with the prior art, which is solved by the treatment system according to the invention.
  • Step c) of the method may include determining the residual particle and oil content in the water phase of the decanter.
  • the particle and oil content may be two important parameters to determine with a view to the further settings of either the decanter or the separator, according to where the water phase is carried.
  • Step c) of the method may be followed by step d) if the particle content of the water phase of the decanter exceeds a predetermined value; or step c) may be followed by step e) if the particle content in the water phase of the decanter is lower than or equal to the predetermined value.
  • limit values are set for other components in the slop water, or that there are limit values for several components at the same time, so that the water phase that comes out of the decanter must satisfy all of these before it may be passed on to the next purification stage which, in this embodiment, is the separator.
  • the method may further include the following steps:
  • step f) if the oil content of the water phase of the separator exceeds a predetermined value: carrying the water phase into the separator again, and then repeating step f) until the oil content of the water phase of the separator is lower than the predetermined value.
  • the separator is the last purification stage before fully purified water is discharged into the sea or ground, pos- sibly is collected. If the water is to be discharged or used for various purposes, it is necessary to check the purity of the water.
  • the method may include the further step: h) passing the water phase through a treatment device for the further removal of particles and oil.
  • the method for purifying slop water may further be adapted for the slop water in question by including one or more treatment devices in addition to the decanter and the separator.
  • a treatment device for removing particles and oil may be included between the decanter and the separator. After an analysis of the water phase from the decanter, it may then be decided whether the water phase is to go back to the decanter, to the separator or to the treatment device between the decanter and the separator before it goes to the separator.
  • the treatment device may be a filter package, for example.
  • the method may include the further step: i) passing the water phase through a further treatment device for the further removal of particles and oil.
  • Yet another further treatment device for example a filter package, may be included in the treatment system for further purification of the water phase that comes out of the separator.
  • the method may further include the further step: j) passing the water phase through a desalination unit.
  • a desalination unit for example in the form of reverse-osmosis membranes.
  • Figure 1 is a flowchart showing a treatment system comprising a decanter and a separator
  • Figure 2 is a flowchart showing a treatment system comprising a decanter and a separator and a treatment device between the two;
  • Figure 3 is a flowchart showing the treatment system of figure 2 including a further treatment device; and Figure 4 is a flowchart showing the treatment system of figure 3 further including a desalination unit.
  • FIG. 1 shows, in the form of a flowchart, how a treatment system 1 according to the invention may be set up in one embodiment.
  • the treatment system 1 comprises three main components, namely a decanter 2, an analyser 3 and a separator 4.
  • the treatment system 1 is suitable for purifying liquid drilling waste or so-called slop water, reference being made to the definition of liquid drilling waste initially in this application.
  • the slop water is carried into the decanter 2 through an inlet 21 after the composition of the slop water has been analysed for particle, oil and water content in a first analyser unit 31 of the analyser 3.
  • the analysis in the first analyser unit 31 shows that, for example, the particle content of the slop water is so low that the slop water may advantageously be carried directly to the separator 4 of the treatment system 1, this may be done via a bypass 101.
  • the slop water is carried into the decanter 2 after the settings thereof have been adjusted according to the portions of solids, oil and water contained in the slop water, and also according to the particle size of the solids.
  • the decanter 2 separates solids, which are carried out of the decanter 2 through an outlet 23 and on to a collection receptacle 5 for solids. Further, the decanter 2 separates oil, which leaves the decanter 2 through an outlet 24 and which is carried to a collection receptacle 6 for oil.
  • the remaining slop water, which has not been separated out as solids or oil, is referred to as the water phase from the decanter 2 and is carried out of the decanter 2 through an outlet 22.
  • This water phase is then analysed in a second analyser unit 32 for residual oil and particle content. If, for example, the residual particle content is higher than a predetermined limit value, the water phase may be returned to the decanter 2 through the return line 102.
  • the separator 4 will be set on the basis of the analysis of the water phase, and the water phase is carried into the separator 4 via an inlet 41.
  • the separator 4 is a three-phase separator which can separate three different phases, in this case particles or fines, oil and a water phase. The fines come out of the separator 4 through an outlet 44 and are returned for another round in the decanter 2 via the return line 103. Oil is separated through an outlet 43 and carried to the collection receptacle 6 for oil. The water phase from the separator 4 is separated out via an outlet 42 and is then analysed in a third analyser unit 33.
  • the slop water is considered fully purified and the water phase from the separator may be carried into the sea or ground or to some suitable collecting site 10.
  • the water phase from the separator 4 not satisfying the purity requirements set it may be returned for another round in the separator 4 via a return line 105.
  • the analyser 3 may include a computer system 35 which controls the analyser units
  • the treatment system 1 including a number of valves may be controlled in its entirety from a PLC (Programmable Logic Controller) system 36 which may be monitored via the computer system 35.
  • PLC Programmable Logic Controller
  • FIG 2 shows the same system as figure 1, with the addition of a treatment device 7, for example a filter package.
  • a treatment device 7 for example a filter package.
  • the water phase may be carried into the treatment device 7 via an inlet 71.
  • the treatment device 7 is shown as two parallel filter packages, and the inlet 71 comprises two inlets.
  • any remaining larger particles and possibly also oil may be removed .
  • solids and oil will stay behind in the filter package, whereas the water phase is passed on to the separator 4 via the line 106.
  • the treatment device 7 constitutes an extra purification stage that the water phase from the decanter 2 may be brought to bypass if it is not necessary or desired in a given case.
  • the filter package is self-cleaning and that there is an outlet for solids and/or oil.
  • the treatment system 1 of figure 2 has been expanded with a further treatment device 8.
  • the further treatment device 8 is provided with an inlet 81.
  • the further treatment device 8, too is shown as a filter package with two parallel filters.
  • the water phase that comes out of the further treatment device 8 is carried via the line 107 to a fourth analyser unit 34. If the analysis in the analyser unit 34 shows that the requirements for purity of the water phase are not met, the water phase will be returned via the return line 105 to the separator 4 or via the return line 105 and the bypass line 104 for another round in the further treatment device 8.
  • the further treatment device 8, too may be made to be self-cleaning. In such an embodiment, there will be a further outlet for solids and oil, for example in the form of a return line to the decanter.
  • the desalination unit 9 may, for example, be a unit for reverse osmosis. Even though the desalination unit 9 is shown here in a set-up including the two treatment devices 7, 8, it must be understood that the desalination unit 9 could just as well have been shown in an embodiment without one or both of these treatment devices 7, 8.
  • the fourth analyser unit 34 the salinity of the water is analysed in addition to the other factors like oil content, for example. On the basis of said analysis, the water will then either be returned to the separator 4 or the filter package 8, be passed on to the desalination unit 9 or be carried out of the treatment system to be used anew. If the water is carried into the desalination unit 9, it will then be analysed in a fifth analyser unit 37 at the outlet thereof, to determine whether the water now has the desired salinity or whether it will have to be returned to the desalination unit 9 once more.

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Abstract

L'invention concerne un système de traitement (1) de l'eau boueuse, le système de traitement (1) comprenant : un décanteur (2) incluant au moins un orifice d'entrée (21) pour l'eau boueuse à purifier et un orifice de sortie (22) pour une phase d'eau ; un séparateur (4) relié au décanteur (2) en aval de celui-ci ; et un analyseur (3) incluant une unité d'analyse (31) placée en amont de l'orifice d'entrée (21) du décanteur (2) du système de traitement (1) pour déterminer la teneur en matières solides et en huile de l'eau boueuse. Le système de traitement (1) selon l'invention est caractérisé en ce que l'analyseur (3) du système de traitement (1) comprend en outre une deuxième unité d'analyse (32) en aval du décanteur (2) pour analyser la phase d'eau sortant de celui-ci ; et en ce que ladite analyse de ladite phase d'eau détermine : si la phase d'eau sera retournée pour une nouvelle purification dans le décanteur (2), ou si la phase d'eau sera transférée au séparateur (4) et, dans ce cas, les réglages de celui-ci. L'invention concerne également un procédé de purification de l'eau boueuse en utilisant ledit système de traitement (1).
PCT/NO2016/050137 2015-07-03 2016-06-23 Système de traitement mécanique de l'eau boueuse et procédé d'utilisation de celui-ci Ceased WO2017007330A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SA517390649A SA517390649B1 (ar) 2015-07-03 2017-12-30 نظام معالجة ميكانيكية لماء ملوث وطريقة لاستخدامه

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20150867 2015-07-03
NO20150867A NO339348B1 (no) 2015-07-03 2015-07-03 Rensesystem for mekanisk rensing av flytende boreavfall og fremgangsmåte for bruk av samme

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WO2017007330A1 true WO2017007330A1 (fr) 2017-01-12

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PCT/NO2016/050137 Ceased WO2017007330A1 (fr) 2015-07-03 2016-06-23 Système de traitement mécanique de l'eau boueuse et procédé d'utilisation de celui-ci

Country Status (3)

Country Link
NO (1) NO339348B1 (fr)
SA (1) SA517390649B1 (fr)
WO (1) WO2017007330A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3322599A1 (de) * 1983-06-23 1985-01-03 Wolfgang 7982 Baienfurt Kappler Abscheideranlage zur sammlung und behandlung fluessiger und schlammfoermiger mineraloelhaltiger abfaelle
US6132630A (en) * 1998-02-17 2000-10-17 Tuboscope Vetco International Inc. Methods for wastewater treatment
US20140166576A1 (en) * 2012-12-18 2014-06-19 Oreco A/S System for and method of separating oil and particles from produced water or fracturing water
US8834723B1 (en) * 2011-03-22 2014-09-16 Enviro-Tech Systems, L.L.C. Smart water discharge monitoring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3322599A1 (de) * 1983-06-23 1985-01-03 Wolfgang 7982 Baienfurt Kappler Abscheideranlage zur sammlung und behandlung fluessiger und schlammfoermiger mineraloelhaltiger abfaelle
US6132630A (en) * 1998-02-17 2000-10-17 Tuboscope Vetco International Inc. Methods for wastewater treatment
US8834723B1 (en) * 2011-03-22 2014-09-16 Enviro-Tech Systems, L.L.C. Smart water discharge monitoring system
US20140166576A1 (en) * 2012-12-18 2014-06-19 Oreco A/S System for and method of separating oil and particles from produced water or fracturing water

Also Published As

Publication number Publication date
SA517390649B1 (ar) 2023-10-01
NO339348B1 (no) 2016-11-28
NO20150867A1 (no) 2016-02-19

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