KR101667973B1 - Desalination system of salt water using underground shaft, fresh water producing apparatus and method using the same - Google Patents

Abstract

The present invention is characterized in that a reverse osmosis type brine desalination module is installed in an underground hole such as a drilling rig excavated at the time of oil field development and the flow direction of the brine and fresh water is adjusted by using a fresh water conversion device installed underground, The present invention relates to a desalination plant for underground salt water which is capable of desalinating brine produced in a reservoir of oil field and directly injecting purified fresh water as an indicator into production or storage reservoir.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desalination system for desalination,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brine desalination system using fresh water, a fresh water production apparatus and a method thereof. Specifically, the present disclosure relates to a system including a desalination production apparatus constituting a reverse osmosis type saline desalination module in an underground hole such as a borehole, and a desalination method using the same.

The description of this item is intended to provide background information and should not be construed as limiting or limiting the scope of the present disclosure.

The reverse osmosis membrane type desalination plant is widely used for the desalination of salt water because it can remove salt and harmful substances without phase change of the fluid, is easy to operate, and has an advantage in energy efficiency.

1, the brine supplied from the sea is pressurized by the pressurizing pump 2 'through the pH adjustment and the suspended solids removal process in the pretreatment process 1', and the reverse osmosis process 3 ' Lt; / RTI > When the pressurized brine passes through the reverse osmosis membrane, the salinity is filtered and the water passing through the reverse osmosis membrane is desalinated to be desalinated and transferred to the distribution system to be used as potable water after pH adjustment and degassing in the post-treatment process (4 '). The brine that does not pass through the reverse osmosis membrane gradually accumulates salinity, becomes a highly concentrated brine and is discharged to the outside or back to the sea. As the reverse osmosis membrane, a spirally wound or hollow fine fiber membrane is mainly used. In a large-scale plant, dozens of unit units having reverse osmosis membrane modules are arranged in parallel to treat a large amount of brine.

However, since the brine desalination system using this method uses tubular reverse osmosis membrane modules connected in parallel, equipment and space for collecting and managing connected reverse osmosis membrane modules are required, and depending on the region, Therefore, there is a disadvantage that the desalination rate of the brine is greatly affected.

On the other hand, it is common to produce a crude oil with a large amount of rock in the oil field, and the produced rock mass has saltiness similar to or higher than that of sea water depending on the depth of production. The produced brine should be re-injected or discharged to the surface to prevent pressure drop in the underground space due to the production of crude oil. In order to release it, saline in production water should be removed to the level similar to fresh water. Large-scale desalination plants are needed to desalinate these genetically produced water. However, it is not easy to install a large-scale surface desalination plant in the oilfield.

Also, Robertson EP: Low-Salinity Waterflooding To Improve Oil Recovery-Historical Field Evidence SPE 109965 (2007) and Dang C., Nghiem L., Chen Z., Nguyen Q. and Nguyen N .: State-of-the Art Low Many recent studies, such as Salinity Waterflooding for Enhanced Oil Recovery , have shown that oil can be significantly increased when fresh water with low salt content is injected instead of brine produced when water is injected into the reservoir to promote crude oil production . However, this requires a large-scale facility for desalination of the brine produced, and this is the reason why the freshwater injection method is not widely applied in the oil field.

U.S. Patent No. 5,916,441 provides three mine shafts, two reverse osmosis modules at the bottom of the middle tunnel, and one at the bottom to supply seawater to selectively pass the reverse osmosis module of the middle tunnel And then supplying drinking water or agricultural water to the ground through the tunnel or the last tunnel. However, this prior art does not consider the freshwater injection method in the genetic reservoir. In addition, there is a disadvantage that only a small amount of fresh water is produced.

U.S. Patent No. 7,600,567 discloses a method in which an injection hole is provided up to a hydrocarbon-containing layer, which is a petroleum-containing layer, and salt water is injected through the injection hole. Then, fresh water passing through the reverse osmosis membrane provided under the injection hole is pressurized by using a pump, Containing layer of the present invention. Highly concentrated brine is discharged to the ground through the space between the annulus and the injection hole. This prior art discloses the principle of supplying fresh water to the dielectric layer, but it has a drawback in that it can produce only a small amount of fresh water.

None of the above prior art consider the mass production of fresh water and the delivery of it to the reservoir by connecting multiple reverse osmosis modules to the injection well.

Therefore, the present disclosure aims at minimizing the ground space and complicated piping necessary for operating the desalination apparatus for desalination water obtained from the saline water using the reverse osmosis membrane, and minimizing the change in the treatment rate due to environmental changes such as temperature.

It is still another object of the present invention to provide a desalination system, a desalination plant, and a method for producing a desalination water that diversifies the use of fresh water through a large scale desalination using an underground ball.

In order to accomplish the above object, the present invention provides a desalination system for a brine using an underground hole, the system comprising: a long casing installed inside the underground hole and forming an annulus for injecting salt water between the underground hole; And a reverse osmosis module including a reverse osmosis membrane provided outside a tubing having a plurality of through holes and a tubing outside the tubing, the plurality of reverse osmosis modules being connected in series in a casing, the tubings being connected in fluid communication, Thereby providing a desalination system.

Further, the present disclosure relates to a desalination system for brine using an underground hole, the system comprising: a long casing installed inside the underground hole and forming an annulus for injecting salt water between the underground hole; A fresh water production device installed inside the casing, in which a plurality of reverse osmosis modules including a tubing having a plurality of through holes formed therein and a reverse osmosis membrane provided outside the tubing, and the tubings being connected in fluid communication; A packer hermetically coupled to the casing at a lower portion of the casing to block fluid movement in a vertical direction within the casing; And a desalination switching device installed below the fresh water producing device for supplying the fresh water having passed through the reverse osmosis module to a ground or a reservoir underground.

Further, the present disclosure relates to a method for desalination of brine using an underground hole, comprising the steps of: injecting brine through an annulus formed between an underground hole and a casing installed inside the underground hole; A plurality of reverse osmosis modules including a tubing having a plurality of through holes formed therein and a reverse osmosis membrane provided outside the tubing are connected in series to each other and the tubing is connected to be in fluid communication, And desalting the brine to thereby desalinate the brine.

According to the present disclosure, it is possible to desalinate brine produced at a minimum cost when an existing drill hole is used as an underground hole in a oil field, and it is easy to produce purified fresh water as an indicator or inject it into a reservoir .

Furthermore, according to the present disclosure, it is possible to produce fresh water on the ground by a simple operation or to supply fresh water to a reservoir layer, and thus it is possible to efficiently distribute and utilize fresh water.

The effects of the present invention are exemplified, and the effects of the present invention will become more apparent from the embodiments with reference to the following drawings.

FIG. 1 is a view showing a conventional desalination plant.
FIG. 2 is an overall configuration diagram of a desalination desalination system using an underground hole according to an embodiment of the present disclosure; FIG.
3 is a block diagram of a reverse osmosis module of an embodiment of the present disclosure;
Fig. 4 is a configuration diagram of a fresh water conversion apparatus in one embodiment of the present disclosure; Fig.
Fig. 5 is an operational view of the fresh water switching system of an embodiment of the present disclosure, wherein Fig. 5 (a) shows the ground-based transfer mode of fresh water and Fig. 5 (b) shows the reservoir transfer mode of fresh water.
FIG. 6 is a conceptual diagram showing the flow of brine and fresh water according to the fresh water switching device of one embodiment of the present disclosure, wherein FIG. 6 (a) (c) shows the reservoir transport mode of brine.
FIG. 7 is an overall configuration diagram of a brine desalination system using an underground hole including a horizontal hole as another embodiment of the present disclosure. FIG.
FIG. 8 is a plan view of a salt water desalination system conceptually showing a plurality of horizontal holes branched on the basis of an underground hole as another embodiment of the present disclosure; FIG.

First, the technical features of the present invention will be described generally.

In general, the production of crude oil or the injection of production water is carried out through a production line installed in a sewer system, such as an underground craft of several hundred to several thousand meters depending on the depth of the reservoir. This production pipe is constructed by connecting the tubing of about 10 m in length to each other by connecting the tubing to each other using a seam, so there is no restriction on the length and installation direction of the production pipe in theory. In this case, if a large number of small holes are formed in the tubing, a reverse osmosis membrane is coated on the tubing, and a saltwater is passed through the tubular body, the drilling tube and the production tube itself can be used as a huge desalination module. In this case, it is advantageous to coat the reverse osmosis membrane on the outside of the tubing and to design the moving direction of the salt water from the outside to the inside of the tubing to prevent rupture of the reverse osmosis membrane and prolong the life of the bath.

It is also a common practice to use vertical and horizontal drilling rigs to produce crude oil or to inject water. Therefore, it is possible to desalinate brine produced with minimum cost when using existing drill holes in the oil field, and it is easy to produce purified fresh water as an indicator or inject it into a reservoir.

In addition, it is possible to maintain the same temperature condition for the whole section of the river when using the horizontal river, and when a plurality of river basins are radially drilled, a large number of reverse osmosis membrane modules As shown in Fig. In addition, when the desalination plant is grounded in such a manner in a high temperature region, it is possible to suppress the rise of the saline water due to the heating of the treatment facility, and desalination of the saline water can be performed at a constant temperature regardless of the external environment.

In a desalination plant using a reverse osmosis membrane, a large surface area and complicated piping are required because a large number of reverse osmosis membranes must be connected and integrated in parallel, and the reverse osmosis membrane tube is connected in series in a vertical or horizontal borehole Eliminating the need for large-scale installations on the ground.

Hereinafter, preferred embodiments of the present disclosure will be described with reference to the drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

Fig. 2 is an overall configuration diagram of a salt water desalination system 1 using an underground hole of the present embodiment.

In Fig. 2, an underground hole is erected perpendicularly from the surface. The underground ball may be, for example, a crude oil well. A circular long casing 10 is provided over the entire length of the underground hole. The length of the casing 10 installed in the underground hole and the underground hole is not limited, but is preferably extended to the reservoir layer requiring freshwater injection. In the upper part of the casing (10), various facilities for brine injection, fresh water suction and delivery, and concentrated water discharge are installed. (400) is a brine injection device, which includes a pressurization pump and a conduit. (300) is a fresh water suction and delivery device, and includes an on-off valve, a suction pump, and a conduit. These devices are known, and any existing equipment can be suitably modified and adopted.

A packer (51) is provided below the casing (10), and the packer (51) functions as a hermetic member for preventing fluid movement above and below. A cloth tool 12 is formed on the lower portion of the casing 10 beyond the packer 51. The cloth tool 12 is a passage for injecting brine or fresh water into the surrounding reservoir. The lower surface of the casing 10 is closed.

The saline desalination system 1 of the present disclosure mainly includes a fresh water production apparatus 2 installed in the region A and a fresh water conversion apparatus 5 installed in the region B. The fresh water producing device 2 is a device for generating fresh water from brine, and the fresh water conversion device 5 is a device for selectively transferring the produced fresh water to the ground or reservoir. The fresh water producing device 2 and the fresh water conversion device 5 are all installed in the casing 10 as shown in the figure.

First, the fresh water producing apparatus 2 of the present embodiment will be described. The fresh water producing apparatus 2 is installed inside the casing 10 and has a long column-like shape as a whole. An annular space (S) is formed between the casing (10) and the fresh water producing device (2), and the annulus (S) is formed from the surface to the vicinity of the position where the packer (51) is installed. Salt water is injected from the groundwater brine injector 400 through the annulus S. The brine can be groundwater or rocks in a genetic zone at a concentration similar to that of sea water or salt water. In the latter case, underground brine discharged to the ground through other wells can be used as a source.

The fresh water production apparatus 2 is constructed by arranging a plurality of reverse osmosis modules 20 including tubing in series in a vertical direction. The tubing as a product for the production of crude oil and water injection is designed so as not to allow fluid movement with the annulus S, but in this embodiment a large number of holes are drilled in the tubing 28, And then installed in the borehole to form the reverse osmosis module 20.

3 is a configuration diagram of the reverse osmosis module 20 of the present embodiment. The reverse osmosis module 20 includes a tubing 28, a reverse osmosis membrane 26, a protective cover 22 and a joint 34.

The tubing 28 forms an elongated cylinder of several meters or ten meters or more. On the outer surface of the tubing 28, a plurality of through holes 32 are formed. The tubing 28 serves as a passage through which saline-free fresh water passes. On the tubing 28, a reverse osmosis membrane 26 is provided over a substantial portion of the length of the tubing 28. As the reverse osmosis membrane 26, any of conventional spiral-type or hollow-type fine fiber membranes can be appropriately selected. On the reverse osmosis membrane (26), a protective cover (22) for protecting the reverse osmosis membrane (26) against impact or vibration is provided. A plurality of through holes (not shown) are formed on the outer surface of the protective cover 22. The protective cover 22 may be made of, for example, aluminum. It will be appreciated that the protective cover 22 is not necessarily an essential part as long as the reverse osmosis membrane 26 and the tubing 28 have sufficient strength and durability.

It is preferable to form a slot 30 between the through holes 32 of the tubing 28 so as to reduce the contact area between the reverse osmosis membrane 26 and the tubing 28 to increase the amount of low-concentration fresh water passing per unit time. It is needless to say that the shape of the through hole 32 through which water can pass is not limited to a circular shape, and that the slot 30 is not limited to a straight path.

The joint 34 is a joint or joint for connecting with the other upper and lower reverse osmosis module 20. The joint 34 is typically made of the same material or of a reinforced material as the tubing 28. It is not necessary to form a through hole on the outer surface of the joint 34 and it is not necessary to provide a through hole in the tubing 28 inserted into the inside of the joint 34. [

Since the reverse osmosis module 20 of the present disclosure is constructed as a unit module for desalination of salt water and the reverse osmosis module is connected in series in a region where desalination is required, Convenient and easy to manufacture. The fresh water production device 2 is installed inside the underground hole by a lifting device (not shown) on the ground, and can be lifted from the underground. In addition, the plurality of tubing 28 connected in series provides a coherent fluid communication passage through which fresh water is directed to the surface and is economically advantageous in that a reverse osmosis membrane can be applied to the existing well-defined tubing for utilization.

Referring again to FIG. 2, the brine desalination system 1 of the present disclosure includes a control valve 4 in a lower reverse osmosis module 20. The control valve 4 closes if the pressure on the side of the annulus S is high and is designed to open if the pressure inside the reverse osmosis module 20, i.e. inside the tubing 28 is high. As the control valve 4, either a piston valve using hydraulic pressure in a closed state from a normal state, or a 2-way solenoid valve can be employed. Solenoid valves can accommodate pressures greater than 5,000 psi. The opening and closing of the control valve 4 can be controlled not only by the automatic switching by the hydraulic pressure but also by the opening and closing on the ground. For the latter, a pressure sensor for detecting the pressure difference inside the annulus S and the tubing 28 may be provided, and the pressure difference on the ground may be monitored in real time.

Further, the desalination system 1 of the present disclosure includes a discharge passage 3 for highly concentrated brine installed in the annulus S adjacent to the fresh water production apparatus 2 from the ground to the vicinity of the control valve 4. The discharge passage 3 is a passage for discharging the highly concentrated concentrated water remaining after accumulation of the salts that have not passed through the reverse osmosis membrane 26 to the ground.

The basic operation of the fresh water producing apparatus 2 of the saline desalination system 1 of the present disclosure described above will be described.

 First, salt water is injected into the annulus (S). The injected brine is filled with the annulus S, and as the water level increases, the lowered reverse osmosis module 20 is gradually brought into contact with the upper reverse osmosis module 20. In the desalination process using reverse osmosis membrane, the pressure difference applied between the brine injection part and the fresh water outlet part is generally 1,000 psi. Therefore, when the pressure of 1000 psi is applied to the brine to be injected, The pressure difference between the annulus and the tubing is maintained at 1,000 psi according to the hydrostatic pressure of the water so that the brine passes through the reverse osmosis membrane 26 and moves to the tubing 28 to desalinate the brine . Fresh water having passed through the tubing 28 is discharged to the ground. Freshwater discharge is preferable to natural discharge as the freshwater level rises, but freshwater movement can be further promoted by using a ground suction pump.

When the desalination process is continuously performed, the concentrated water remaining in the annulus (S) becomes higher than that of the injection salt, and the concentrated water continuously flows to the deep part of the underground water and the salinity is continuously increased . As a result, surface discharge of the concentrated water is required, and this concentrated water can be discharged by the discharge passage 3 and the control valve 4. [ As described above, the control valve 4 is designed to be closed when the pressure on the side of the annulus S is high and to open when the pressure inside the tubing 28 is high. Therefore, in the case of forced forced- When a slight pressure (for example, 100 psi) is applied to the interior of the tubing 28 by removing the pressure applied to the annulus S, the concentrated water accumulated in the deep portion of the annulus S flows through the discharge passage 3 to the surface . On the other hand, according to the volume reduction due to the salt water movement into the tubing 28 and the effect that the salt water continuously injected from the surface pushes the concentrated water, concentrated water is concentrated at the bottom of the desalination plant So that the discharge passage 3 provided at the lower part of the desalination plant can perform the function of the concentrated water discharge passage at normal times as well. It will be understood by those skilled in the art that any known configuration for discharging high-concentration salt water may be appropriately modified and employed in addition to the description of FIG.

The brine desalination system of the present disclosure is suitable for a large-scale plant in which salt water sufficiently fills annulus (S) by utilizing an underground hole such as a drill hole, but is not limited thereto.

Next, the fresh water conversion device 5 of the present disclosure will be described.

2, the fresh water conversion apparatus 5 of the present saline desalination system 1 includes a first diversion member 52 and a second diversion member 53. The first switching member 52 is connected to a lower portion of the lowermost control valve 4 of the fresh water producing apparatus 2 and the second switching member 53 is connected to a packer 51 installed on the lower casing 10 of the reverse osmosis module 20. [ Respectively.

4, a first through hole 54 is formed in a lower portion of the first switching member 52, and the upper surface of the second switching member 53 is opened And this closed housing is included. The first through holes 54 are formed in a plurality of horizontal slot shapes in the illustrated example, but are not limited thereto. The upper portion of the first switching member 52 is fastened to the tubing 28 below the concentrated water discharge control valve 4 connected to the lower part of the reverse osmosis module 20 of the fresh water producing device 2, The fluid inside the tubing is designed to flow downward through the first through hole 54 only. The first switching member 52 does not necessarily need to be fastened to the tubing 28 as long as the top surface thereof is fluidly connected to the lowermost reverse osmosis module 20 and the control valve 4. [

The second switching member 53 includes a housing whose upper surface is open and whose lower surface is closed, and a second through hole 55 is formed on the outer surface of the upper portion of the housing. The second through holes 55 are formed in a plurality of vertical slots in the illustrated example, but are not limited thereto. An upper end portion higher than the portion where the second through hole 55 is formed in the second switching member 53 is inserted into the packer 51 and fixed firmly. The diameter of the second switching member 53 is designed to be larger than the diameter of the first switching member 52 so as to accommodate the downward movement of the first switching member 52. [

In the illustrated example, the switching members 52 and 53 are cylindrical containers, but it is needless to say that the shape and structure of the switching members 52 and 53 can be changed as long as the fresh water conversion mode can be executed.

The flow switching mode of the fresh water using the fresh water switching device 5 of the present disclosure will be described with reference to FIGS. 5 and 6. FIG.

Fig. 5 (a) is a fresh water transfer mode to the ground, which is the same as that of Fig. 2, and the flow of saline and fresh water at this time is shown in Fig. 6 (a). 6, the fresh water production apparatus 2 is shown in a column form only for convenience of illustration. As described above, the brine injected through the annulus (S) passes through the reverse osmosis membrane (26) to become fresh water, which is transferred to the ground through the tubing (28). The first switching member 52 descends to the lower portion of the second switching member 53 and the first through hole 54 provided in the first switching member 52 and the second through hole 54 provided in the second switching member 53, Since the through holes 55 are not connected to each other, fluid movement to the lower portion is blocked, and the packer 51 blocks the salt water movement through the annulus S, so that the area below the packer 51, It does not.

5 (b) is a reservoir transport mode. The fresh water production apparatus 2 is raised by the operation of the lifting device on the ground and the first through hole 54 provided in the first switching member 52 and the second through hole 55 provided in the second switching member 53 Are positioned at the same height, and the fresh water is structured to be in fluid communication through the overlapping through holes 54, 55. In this state, when the open / close valve of the fresh water suction and delivery device 30 on the ground is closed and the brine is injected into the annulus S, the fresh water passing through the reverse osmosis membrane 26 is not delivered to the ground via the tubing 28 , And flows to the first switching member (52). Fresh water having passed through the first through hole 54 of the first switching member 52 passes through the connected second through hole 55 and flows to the lower surface of the casing 10 through the cloth tool 12 as shown in FIG. As shown in Fig. Here, the first switching member 52 and the second switching member 53 together with the cloth tool 12 of the casing 10 form a fresh water outflow path to the reservoir layer.

6 (c) is a flow chart when brine is supplied into the tubing 28 through the freshwater suction and delivery device 300 on the ground, in the same state as in Fig. 5 (b). Freshwater suction and delivery device 300 may receive brine independently or from brine injection device 400. The reverse osmosis membrane 26 does not need to operate, and the brine is supplied to the reservoir through the same path as in Fig. 5 (b). It will be appreciated that the art of saline infusion into reservoirs is known, but those skilled in the art will be able to utilize the saline desalination system of the present disclosure to achieve the same function.

 According to the fresh water conversion device 5 of the present invention with reference to FIGS. 5 to 6, it is possible to produce fresh water on the ground by a simple operation or to supply fresh water to a reservoir, which is advantageous in efficient distribution and use of fresh water.

However, it should be noted that one of the features of the present disclosure is the fresh water production structure described with reference to FIG. 2, so that it is possible to omit the installation of the fresh water conversion device 5 when only fresh water supply to the ground is required.

When only the fresh water is to be injected into the reservoir, only a single container having a slot formed on the outer surface thereof is connected to the lowermost tubing without distinguishing between the first and second switching members, And the brine can be injected into the annulus S to absorb the fresh water into the reservoir through the slot. Thus, the present disclosure provides flexibility to determine the supply mode and desalination system, as appropriate, in accordance with the use of fresh water, production conditions and the surrounding environment.

Fig. 7 is a schematic view showing a case in which a basement hole includes a horizontal hole as another example of the saline desalination system of the present disclosure; Fig. The description of the basic structure and operation will be omitted since it is the same as that described above based on the manual worker. When the water level is maintained, the same temperature condition is maintained for the entire section of the water level. In the case where the desalination plant is underfilled in such a high temperature region, the rise of the salt water temperature due to the heating of the treatment facility can be suppressed, It is advantageous that desalination of the brine can be performed at a constant temperature.

Fig. 8 is a plan view of another example of the saline desalination system of the present invention, in which the vertical portions of the underground holes are concentrated at one point and a plurality of horizontal holes are radially extended. The casing 10 'arranged in the horizontal plane is turned in the casing 10 of the horizontal hole to form a fluid communication structure. When drilling in this way, an innumerable number of reverse osmosis membrane modules can be installed in a certain area from the minimum space on the ground, which makes it possible to concentrate fresh water production and even supply it to the reservoir.

The foregoing is merely illustrative of the technical idea of the embodiment, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than limiting, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (19)

A desalination system for brine using an underground ball, the system comprising:
A long casing installed inside the underground hole and forming an annulus for injecting salt water between the underground hole;
A fresh water production device in which a plurality of reverse osmosis modules including a plurality of reverse osmosis membranes and a reverse osmosis membrane provided outside the tubing are installed in series in the casing and the tubings are connected in fluid communication; And
And a fresh water conversion unit under the fresh water production unit.
A packer is further provided at a lower portion of the casing so as to be hermetically coupled to the casing to block fluid movement in a vertical direction in the casing,
The fresh water conversion device includes a first conversion member formed with a through-hole and connected to a lowermost reverse osmosis module of the fresh water production device, and a second conversion member formed with a through-hole and installed in the packer,
And the fresh water supplied through the fresh water producing device is communicated with the through-holes of the first switching member and the second switching member to be supplied to the underground surrounding reservoir below the packer through the through hole. The desalination system of claim 1, further comprising an exhaust passage connected to a lower portion of the fresh water producing device and capable of discharging the concentrated water to an indicator. The desalination system of claim 1, wherein a control valve is provided at a lower portion of the fresh water producing device to adjust fluid movement from the inside of the tubing to the annulus direction. delete delete The desalination system of claim 1, wherein the second diverting member is sized to receive the first diverting member and located below the first diverting member. The apparatus according to claim 6, wherein the first switching member has an upper surface opened and a lower surface closed, a through hole formed in an outer surface of the housing, the second switching member having an upper surface opened, Wherein the through hole is formed on an outer surface of the housing. The desalination system of claim 1, wherein the reverse osmosis module further comprises a protective cover having a plurality of through-holes formed therein for protecting the reverse osmosis membrane. 9. The desalination system according to any one of claims 1 to 7, wherein a slot for connecting the tub is formed between the through-holes of the tubing to reduce a contact area between the tubing and the reverse osmosis membrane, . The method as claimed in claim 3, wherein the control valve is designed to be closed when the pressure on the annulus side is high and to open when the pressure inside the tubing is high. When the pressure is higher than the annulus on the tubing, Desalination system. 8. The desalination system of claim 7, wherein the casing in the vicinity of the first switching member or the second switching member is provided with a cloth tool for communicating with a reservoir underground. A desalination system for brine using an underground ball, the system comprising:
A long casing installed inside the underground hole and forming an annulus for injecting salt water between the underground hole;
A fresh water production device installed inside the casing, in which a plurality of reverse osmosis modules including a tubing having a plurality of through holes formed therein and a reverse osmosis membrane provided outside the tubing, and the tubings being connected in fluid communication;
A packer hermetically coupled to the casing at a lower portion of the casing to block fluid movement in a vertical direction within the casing; And
And a fresh water switching device installed below the fresh water producing device for supplying fresh water having passed through the reverse osmosis module to a reservoir underground,
The fresh water conversion device includes a first conversion member formed with a through-hole and connected to a lowermost reverse osmosis module of the fresh water production device, and a second conversion member formed with a through-hole and installed in the packer,
And the fresh water supplied through the fresh water producing device is supplied to the underground surrounding reservoir below the packer through the through hole when the first switching member and the through hole of the second switching member communicate with each other. 13. The desalination system of claim 12, wherein the second diverting member is located below the first diverting member in a size that accommodates the first diverting member. delete 13. The desalination system of claim 12, wherein the underground hole includes a vertical hole and a horizontal hole communicated with the water hole, wherein the casing is installed over the vertical hole and the horizontal hole. 16. The desalination system of claim 15, wherein a plurality of horizontal holes communicate with each other with respect to the horizontal hole, and the plurality of casings arranged in the horizontal direction form a structure capable of fluid communication with the vertical direction of the casing. A method for desalination of brine using an underground ball, the method comprising:
Injecting salt water through the annulus formed between the underground hole and the casing installed in the underground hole;
A plurality of reverse osmosis modules including a tubing having a plurality of through holes formed therein and a reverse osmosis membrane provided outside the tubing are connected in series to each other and the tubing is connected to be in fluid communication, Desalting the brine; And
A first switching member connected to the lowermost reverse osmosis module of the fresh water producing device and having a through hole formed therein and a second switching member disposed below the first switching member to receive the first switching member, Connecting the second switching member provided in the packer which blocks the fluid communication between the upper and lower portions so as to be in fluid communication with each other so that the fresh water passing through the tubing is supplied to the second switching member; And
And discharging the fresh water supplied to the second switching member to the outside of the casing to supply fresh water to the surrounding reservoir below the packer. 18. The desalination apparatus according to claim 17, further comprising: a first switching member connected to the lowermost reverse osmosis module of the fresh water producing device; and a second switching member having a size accommodating the first switching member and positioned below the first switching member And closing the fluid communication to supply the fresh water having passed through the tubing to the ground. delete

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