JP4042969B2 - How to remove pollutants - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for removing volatile pollutants, non-volatile water-soluble pollutants and non-volatile water-insoluble pollutants retained in soil or groundwater in the field.
[0002]
[Prior art]
  Conventionally, as a method of removing volatile pollutants, non-volatile water-soluble pollutants, and non-volatile water-insoluble pollutants retained in the ground on site, it is moved up and down on one side in the horizontal direction of the area to be removed. An injection well along the direction and a suction well along the vertical direction are provided on the other side, and a method of injecting vapor from the injection well while sucking from the suction well and passing the vapor through the removal target region along the horizontal direction It has been proposed (see, for example, Patent Document 1).
[0003]
  In addition, in order to facilitate the removal of a non-aqueous solution (NAPL: Non-Aqueous Phase Liquid) in groundwater, a technique using high-temperature water instead of steam has also been proposed (see, for example, Patent Document 2).
[0004]
  Furthermore, in order to facilitate the removal of contaminants directly under the structure, a technique has been proposed in which an injection well and a suction well are formed along the horizontal direction on both the upper and lower sides of the region to be removed, and the vapor is passed along the vertical direction. Yes. (For example, refer to Patent Document 3).
[0005]
[Patent Document 1]
Japanese Patent No. 2660307
[Patent Document 2]
JP 2002-11456 A
[Patent Document 3]
JP 2002-239524 A
[0006]
[Problems to be solved by the invention]
  However, since all of the above prior arts perform implantation under the same implantation conditions from the whole implantation well for the entire target region, for example, in the case where the formation characteristics differ in the depth direction of the implantation well , It is not possible to perform injection under the injection conditions suitable for each layer,steamHowever, there is a problem that the desired heating effect / heating efficiency cannot be obtained due to local circulation, and the removal level becomes uneven in the depth direction of the implantation well, or the removal efficiency is low.
[0007]
  Therefore, a main problem of the present invention is to enable more effective and efficient removal of contaminants.
[0008]
[Means for Solving the Problems]
  The present invention that has solved the above problems is as follows.
  <Invention of Claim 1>
  In removing the contaminants retained in the ground, an injection well and a suction well are provided at intervals within a range extending from the region to be removed to the neighboring region,steamIn the method of extracting contaminants by suction from the suction well,
A strainer is installed in each of the injection well and the suction well,
A plurality of packers spaced apart in the axial direction are provided on the outer surface, and an injection outer tube having an injection port between the packers is inserted into a strainer installed in the injection well, and the suction well Insert the suction device into the installed strainer,
Sealing the gap between the hole wall of the injection well and the outer pipe at the mouth of the injection well, and sealing the gap between the hole wall of the suction well and the suction device at the mouth of the suction well,
Inflating the packer of the outer injection tube to seal the front and back between the packer,
An injection inner tube having a vapor discharge port and means for liquid-tightly adhering the axial front and rear of the discharge port to the inner surface of the injection outer tube is inserted into the injection outer tube, and the discharge port of the injection inner tube In the state where the axial front and back are in liquid-tight contact with the inner surface of the injection outer tube and the discharge port of the injection inner tube is in communication with the injection port of the injection outer tube, steam is pumped to the injection inner tube. It is discharged from the discharge port, and the discharged vapor is infused into the removal target region through the injection port of the injection outer tube.
It is characterized byHow to remove pollutants.
[0009]
  (Function and effect)
  In this way, a predetermined position in the depth direction of the injection well is set as the injection site, and the front and back of the injection site are sealed from the injection site.steamWhen the implantation is performed, the implantation range in the well depth direction can be limited, and the implantation can be performed under conditions suitable for the formation characteristics of the depth range. Therefore, it is possible to remove pollutants more effectively and efficiently.As a means for sealing the front and back of the injection site, a packer is preferable.
[0010]
  <Invention of Claim 2>
  The suction position is a predetermined position in the depth direction of the suction well, and suction is performed by the suction device from the suction position in a state where the front and rear of the suction position are sealed.The method for removing a pollutant according to claim 1.
[0011]
  (Function and effect)
  Thus, only the limited range can be performed similarly to the injection.
[0012]
  <Invention of Claim 3>
  InjectionOutsideAs a tube, at least three places spaced in the axial directionSaidEach has a packer and between each packerSaidUse one with each inlet,
  Sequentially or simultaneously from the inlet between each packerPenetrationInjecting, and at this time, each of the packers under independent injection conditionsPenetrationClaim to do the injection1 or2. The pollutant removal method according to 2.
[0013]
  (Function and effect)
  In this way, by sequentially or simultaneously injecting from the inlets between the packers, and by performing injection under independent injection conditions for each packer, the formation characteristics differ in the depth direction of the injection well. In such a case, the implantation can be performed under an implantation condition suitable for each layer, the removal level becomes uniform in the depth direction of the implantation well, and uniform contaminant removal can be efficiently performed.
[0014]
  <Invention of Claim 4>
  The pollution according to any one of claims 1 to 3, wherein the pollutant is at least one of a volatile pollutant, a non-volatile water-soluble pollutant, and a non-volatile water-insoluble pollutant. Substance removal method.
[0015]
  (Function and effect)
  The present invention is particularly suitable for removing such contaminants.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail.
  (Basic configuration)
  FIG. 1 conceptually shows the basic principle of the pollutant removal method according to the present invention. In this method, the injection well PW and the suction well SW are provided at an interval from the injection well PW.steamOn the other hand, the contaminant is taken out by suction from the suction well SW.
[0017]
  That is,steamWas injected into the injection well PW, while suction was performed from the suction well SW (negative pressure was applied to the suction well).steamHeats the surroundings while passing through the ground toward the suction well SW. As a result, volatile pollutants are volatilized and other non-volatile pollutants are easily moved through the ground by heating. As a result, these pollutants P1, P2, P3 aresteamThe liquid or the moisture in the ground moves to the suction well SW and can be taken out from the suction well SW.
[0018]
  If injection and suction are stopped at the same time, depending on the processing time, injection was performed.steamRemains in the ground in a state of containing the pollutants P1, P2, P3. Therefore, in some cases, it is preferable to perform suction while the injection is stopped, for example, after the injection and suction for a predetermined time, stop the injection and continue the suction. Depending on the degree of heating,steamEven after the injection is stopped, the underground temperature is at a level that is effective for removing contaminants. Removal of movement is promoted. There is also an advantage that the injection region can be dried by suction in a state where the injection is stopped. This advantage is especially true when the heating fluid is steamed.CareIt is remarkable when there is.
[0019]
  The pollutant targeted by the present invention is at least one of volatile pollutants, non-volatile water-soluble pollutants and non-volatile water-insoluble pollutants retained in the ground, These are P1 retained in the ground above the groundwater level, P2 present on the groundwater surface, P3 present below the groundwater level, and as a pollutant zone occupying a certain area, or between soil particles It exists in the state hold | maintained at the micro area | region. Examples of specific pollutants include volatile organic pollutants such as trichlorethylene, tetrachloroethylene, and benzene, and non-volatile water-soluble pollutants., NonAlthough a volatile water-insoluble contaminant can be mentioned, this invention is not limited to these.
[0020]
  The depths of the injection well PW and the suction well SW can be determined as appropriate according to the depth and form of the target contaminant. For example, when the depth direction range above the groundwater level is targeted, the depth of the wells PW and SW can be set above the groundwater level, and from the range above the groundwater level to the range below the groundwater level. When the whole is to be treated, the depth of the wells PW and SW can be set below the groundwater level.
[0021]
  On the other hand, the number and arrangement of the wells PW and SW are the construction area, construction depth, heating efficiency, suction efficiency, removal efficiency (treatment time), and type of substance to be removed.ClassIt can be determined appropriately according to each. The injection well PW and the suction well SW are ground conditions and injection conditions.(placeAt least one each within a range extending from the region to be removed to the vicinity thereof at an appropriate interval that allows removal of the contaminants based on the above-described principle. More specifically, when the construction area is narrow, there is not much difference in length and width, and heating efficiency is important, a suction well SW is provided only at the center of the construction area so as to surround the circumference of the construction area. If a plurality of injection wells PW, PW are provided at intervals, or if the heating efficiency is not important and the suction efficiency is important, the injection well PW is provided only at the center of the construction area, A plurality of suction wells SW, SW can be provided so as to surround them. When the construction area is wide or elongated, the plurality of injection wells PW, PW and the plurality of suction wells SW, SW can be regularly or irregularly arranged according to the width or length. As a simple enforcement form, it is also possible to adopt a form in which the injection well PW is provided on one side across the removal target region and the suction well SW is provided on the other side.
[0022]
  Heating flow in the present inventionBody andThe steam isUsed. As long as steam is used, a mixed fluid can be used, for example,When volatile pollutants are the main target, when it is desired to ensure dryness in the ground, or when emphasis is placed on fluid permeability through the ground, air on the ground is mainly used. It is also preferable to use a mixed fluid in which the temperature is adjusted by mixing steam in consideration of the type and temperature in the ground.steamIs, CheapDo not pollute the environment with the priceGoodIs suitable.
[0023]
  (First embodiment)
  The present inventionsteamThere is a point in the injection method, and the injection site is defined as a predetermined position in the depth direction of the injection well, and the injection site is sealed before and after the injection site.RemovalFor the target areasteamInjection.
[0024]
  As an injection means with such a seal, for example, a so-called double tube packer type injection tube used for injecting a chemical solution into the ground as shown in FIG. 2 can be applied. The normal double tube packer type injection tube is not intended to inject high temperature fluid, so it is necessary to select materials considering heat resistance, but the basic structure and principle are the same as those for chemical injection Things can be used.
[0025]
  The illustrated example will be described in more detail. The injection device of this example includes an injection outer tube and an injection inner tube 20, and the injection outer tube is constituted by the outer tube 10. The outer tube 10 has a first tube 1, a second tube 2 and a third tube 3. A through hole 4 is formed in the wall surface of the first tube 1, and a flexible sleeve 5 such as a rubber that can be deformed to cover the through hole 4 is provided. A flexible packer 6 such as rubber that is liquid-tightly sealed is attached to the second tube 2 and the third tube 3 that are screwed into the first tube 1.
[0026]
  As shown in FIG. 2, the outer tube 10 is prepared as a unit tube, and the second tube 2 of the unit tube and the third tube 3 of the other unit tube are screwed together to form a long injection outer tube. It can be said.
[0027]
  In the case of a connection-type injection outer tube, a plurality of, for example, three or more packers 6 can be attached to the outer surface portion at intervals in the axial direction. Further, an inlet 7 is formed in the third pipe 3 between the adjacent packers 6 and 6. In addition to one injection port 7, a plurality of, for example, four stages can be formed as shown in FIG. 2, for example, a total of 16 at 90 degree intervals in each stage. These inlets 7, 7... Preferably employ sand particle intrusion prevention means from the surrounding ground. As the sand particle intrusion prevention means, as shown in FIG. Covered with a flexible sleeve 8, orsteamFor example, it is possible to adopt a mode in which, for example, a coating made of vinyl chloride is coated at each step or over the entire surface.
[0028]
  On the other hand, as shown in FIG. 2, the injection inner tube 20 can be inserted into the outer tube 10, the front and rear of the discharge port 22 are in close contact with the inner surface of the outer tube 10, andsteamIs not limited as long as it is pumped, but as an example of its structure, simplysteamIn addition to the one provided with packer members 23 and 24 such as rubber before and after the discharge port 22 of the inner pipe main body 21 having the above-mentioned feeding path, the one shown in FIG. 4 of Japanese Examined Patent Publication No. 63-44893 is used.ofIt can be used as it is.
[0029]
  The dimension between the packers 6 and 6 can be about 10 cm to 2 m, particularly preferably about 25 to 50 cm. Moreover, as shown in FIG. 7, it is preferable to make the total length of the dimension between the packer 6 and the packers 6 and 6 substantially coincide with the heating target range (for example, about 5 to 6 m).
[0030]
  When construction is performed using such an injection apparatus, a suction well and an injection well are respectively formed at predetermined positions set for the removal target region. That is, first, as shown in FIG. 3, the target ground 30 is excavated to a predetermined depth to form the insertion hole 31. In this case, in order to prevent the insertion hole 31 from collapsing, it is desirable to make a hole using the casing 50. The order in which the suction well SW and the injection well PW are formed may be determined as appropriate, which may be performed first or simultaneously using a plurality of drilling machines.
[0031]
  If the insertion hole 31 is formedSuckPull well SWandInjection well PWIn addition,As shown in FIG. 4, a strainer 51 is installed to protect the hole wall and ensure the communication between the hole and the ground.The
[0032]
  Thereafter, as shown in FIG. 5, the suction well SW is provided with means for sucking the inside of the well, for example, by inserting a suction device 60 comprising a suction pipe 61 and a pumping pump 62 connected to the tip thereof. Provide. An injection outer tube 10 is inserted into the injection well PW. The casing 50 can be removed after insertion of these devices, or the strainer 51'sIt is preferable to remove after installation. The outer injection tube 10, the suction device 60 and the strainer 51 can be installed directly or together with the casing 50.
[0033]
  Also, prior to the contaminant removal stepSuckPull well SWandFor injection well PWOhNoAndA gap between the suction device 60 or the outer injection tube 10 at the mouth and the hole wall is sealed with a jacket 52 (flexible sealing material such as rubber) or the like.
[0034]
  If the outer injection tube 10 is installed,steamPrior to the injection, the injection inner tube 20 is inserted as shown in FIG. 6, the discharge port 22 is positioned at the position of the packer 6, and the through hole 4 of the packer 6 and the discharge port 22 are in communication with each other, A bulging fluid, preferably a caking material such as cement or cement bentonite, is pumped through a flow path in the injection inner pipe 20 and is fed into the interior of each of the adjacent packers 6, 6, and these packers 6, 6. Bulges to closely contact the wall surface of the insertion hole 31. In addition to cement bentonite, water or air can be used as the bulge fluid for the packer, but if it is cement bentonite, this will eventually harden and the packer 6 will be firmly attached to the hole wall surface of the insertion hole 31. It is preferable at the point which can do.
[0035]
  In feeding the bulging fluid, as described above, other appropriate means can be used in addition to discharging from the discharge port 22 through the internal flow path using the injection inner tube 20. In any case, the bulging fluid passes through the through hole 4 and the sleeve 5 is deformed by the supply pressure. For example, the both ends of the sleeve 5 are sent into the packer 6 while being separated from the outer surface of the first pipe 1. . When the packer 6 is sufficiently expanded, the supply of the expansion fluid is stopped. Then, the sleeve 5 is restored and the through hole 4 is sealed. The bulging of the packer 6 may be performed at least in the adjacent packers 6 and 6. However, if necessary, all the target packers may be bulged sequentially.
[0036]
  In feeding the bulging fluid, as described above, other appropriate means can be used in addition to discharging from the discharge port 22 through the internal flow path using the injection inner tube 20. At any rate, the bulging fluid passes through the through-hole 4 and the sleeve 5 is deformed by the feeding pressure. For example, the sleeve 5 is fed into the packer 6 while separating both ends of the sleeve 5 from the outer surface of the first pipe 1. It is. When the packer 6 is sufficiently expanded, the supply of the expansion fluid is stopped. Then, the sleeve 5 is restored and the through hole 4 is sealed. The bulging of the packer 6 may be performed at least in the adjacent packers 6 and 6. However, if necessary, all the target packers may be bulged sequentially.
[0037]
  When the setup is completed, as shown in FIG. 7, with the packers 6 and 6 being applied, the injection inner tube 20 is inserted into the injection outer tube 10 or the injection inner tube 20 is expanded. The inner pipe 20 is inserted to a predetermined position as it is, and instead of the bulging fluid in the inner pipe 20steamTo discharge port 22FromFrom the injection well PW, the flexible sleeve 8 is deformed or the coating is broken through the injection ports 7, 7.steamG is injected into the surrounding ground.
[0038]
  steamWhen injecting G, preferably, the inner injection tube 20 is inserted to the deepest part of the outer tube 10 and the adjacent inner packer or all the packers are expanded as described above, and then the corresponding inner injection tube 20 is added to the corresponding note. It is desirable that the inlets 7, 7... Conversely, a step-down method from the upper part to the deepest part or a method of moving up and down in an appropriate selection position order can be employed.
[0039]
  Simultaneously with this injection, or prior to injection or after a predetermined time has elapsed after injection, suction is performed through the suction well SW. In the present invention, it is desirable to continuously change the injection locations while continuously performing the suction, but the suction can be stopped when the injection locations are changed.
[0040]
  By such suction, as described above, the injection was performed.steamG heats the surroundings while passing through the ground toward the suction well SW. And volatile pollutants volatilize, and other non-volatile pollutants become easy to move in the ground by heating. As a result, these pollutantssteamG moves toward the suction well SW along with the liquid or the moisture in the ground, and is taken out from the suction well SW. In this embodiment, since the suction position is not limited to the depth direction of the suction well SW, the heating effect is effective not only in the heating area but also in the heated area as illustrated. When suction is being performed in between, the movement and removal of contaminants from the region to the suction well SW is continued. The aspirated material can be purified by a purification device (not shown) after gas-liquid separation or the like as necessary, or can be stored in a storage tank or the like after the purification process or unpurified.
[0041]
  In the injection apparatus according to the first embodiment, as shown in FIG. 8, the space between the adjacent packers 6 and 6, the wall surface of the insertion hole 31 and the outer surface of the injection outer tube 10 is defined as a space without a filler, and from the entire space.steamG can be injected, in this case, injected through the inlets 7, 7 ...steamG is between adjacent packers 6 and 6,steamG is injected into the ground 30 while filling the wide space. Accordingly, since the entire insertion hole 31 facing the space is infused and injected as an infiltration target area, a large amount of water is injected from one injection zone.steamIt became possible to inject G and penetrated into the groundsteamG is infused far.
[0042]
  steamThe injection rate / injection pressure of G is preferably determined according to the permeation permissible speed / allowable pressure of the ground.
[0043]
  And, in this way, from the injection site in a state where the front and back of the predetermined position in the depth direction of the injection well are sealed by the packersteamWhen the implantation is performed, the implantation range in the well depth direction can be limited, and the implantation can be performed under conditions suitable for the formation characteristics of the depth range. Therefore, for example, by using well-known geological survey methods such as drilling surveys, the geological structure, the types of pollutants, their locations, etc. are known in advance, and appropriate injection conditions at each depth range are determined based on the survey results. Even if the formation characteristics vary in the depth direction of the injection well by performing injection under independent injection conditions for each packer, the injection conditions (injection pressure, injection speed, injection) suitable for each injection siteAmount etc.) Can be injected.
[0044]
  To explain in more detail, when the injection conditions are slid in this way, the effects of the type of formation (sand gravel, etc.) are taken into account.PressureThis is an important factor.ThisIt is desirable to change according to the injection position. ThisAs described above, according to the present invention, it is possible to perform limited injection under appropriate injection conditions for each injection position, so that uniform contaminant removal can be performed efficiently.
[0045]
  By the way, in the illustrated form, since the injection system of the injection inner tube 20 is a single system, simultaneous injection at a plurality of positions is impossible, but by maintaining the independence of the injection conditions by providing a plurality of injection systems. In addition, simultaneous injection at a plurality of locations is possible. For example, although not shown, a plurality of outlets of the inner pipe are provided in the longitudinal direction at intervals corresponding to the inlets of the outer pipe, supply paths to the outlets are individually provided, and individual injection conditions ( If they are independent, they may be different or the same). In this case, an independent supply path for each discharge port can be configured by making the injection inner tube into a multiple tube structure such as a double tube or a parallel tube structure in which a plurality of tubes are bundled.
[0046]
  On the other hand, as a second method, the injection range is partially overlapped (wrapped) in the well depth direction (axial direction) as shown in FIG.steamAs shown in FIG. 9, in a plurality of ranges spaced in the depth direction of the injection wellsteamIn other words, the injection range can be discontinuous in the well depth direction. Others are the same as the first method.
[0047]
  In addition, as a third method, when the depth range to be processed is narrow, if necessary, only one range in the well depth direction per one injection locationsteamCan also be injected. SoThe rest is the same as the first method.
[0048]
  Furthermore, it is of course possible to use other types of double tube packer type injection devices and injection methods within the scope of the present invention.
[0049]
[0050]
[0051]
[0052]
[0053]
  (No.2Embodiment)
  In the above embodiment, straight injection wells and suction wells are formed along the vertical direction. For example, when removing contaminants held in the lower ground of an existing structure, the surrounding ground is directed toward the lower ground. There is a limit to digging a straight well diagonally downward.
[0054]
  In addition, a well along the vertical direction can cover a wide range in the vertical direction, but no matter how deep the well is, the horizontal coverage is not widened.
[0055]
  So in these cases,FIG.As shown, it is desirable to form a well W composed of a curved portion A1 extending from the ground surface to a target depth and a linear portion A2 extending in the lateral direction (substantially horizontal) from the tip. As shown in the figure, when the lower ground of the existing structure C is targeted, a curved portion A1 is provided from the ground surface around the existing structure C to the depth of the lower portion of the existing structure C, and the lower part of the existing structure C A straight portion A2 can be provided to pass through.
[0056]
  The well having such a shape can be formed by Japanese Patent Application Laid-Open No. 2002-194990, Japanese Patent Application Laid-Open No. 2002-194991, Japanese Patent Application Laid-Open No. 2002-250029, and the like by the present applicant. This drilling method will be briefly described as follows. That is, when carrying out curve propulsion using the drilling shaft 70 to which the tapered bit 71 having the pressure receiving surface inclined with respect to the axial direction is attached.FIG.As shown in (a), the rotation of the drilling shaft 70 is stopped in a state where the tip of the pressure receiving surface 71S of the taper bit 71 is located on the side to be bent with respect to the rotation axis, and the drilling shaft 70 is left as it is. Only the driving force is given. At this time, the propulsion direction of the taper bit 70 is gradually changed by the force applied to the pressure receiving surface 71S of the taper bit 71, and the drilling shaft 70 can be propelled into the ground in a curved manner. In other words, the taper bit 71 advances while deflecting to the side so as to release the force received by the pressure receiving surface 71S. In addition, although this curve propulsion can be propelled in a three-dimensional curve and is bent in the vertical plane direction in the illustrated example, it can also be bent in the horizontal plane direction. On the other hand, when performing linear propulsionFIG.As shown in (b), a rotational force and a propulsive force are applied to the drilling shaft 70, and the drilling shaft 70 is propelled into the ground while drilling with a tapered bit 71 at the tip. At this time, the tip of the tapered bit 71 has the pressure receiving surface 71S, but advances while rotating around the axis, so that the influence of the pressure receiving by the pressure receiving surface 71S is canceled out, and it is possible to drill holes linearly. .
[0057]
  Thus, for exampleFIG.As shown in FIG. 2, the drilling shaft 70 can be made to advance in a curved shape from the ground surface to the target layer, and thereafter, the inside of the target layer can be made to advance along the horizontal direction. In addition to stopping at an underground position, such a drilling hole may be a ground portion or a preliminarily placed at a position separated from the insertion position by a predetermined distance (a position opposite to the insertion side when the existing structure lower ground is targeted). It is applicable also when constructing so that it may penetrate into the provided shaft. Needless to say, a hole composed of such a linear portion and a curved portion can be drilled by other known methods.
[0058]
  When applying a well composed of such a curved portion A1 and a linear portion A2,FIG.As shown, the injection well PW and the suction well SW are arranged at intervals in the vertical direction,steamG and pollutant transfer are preferably performed. In this case, when the injection well PW is on the lower side and the suction well SW is on the upper side,steamAlthough it is preferable because the movement of G and contaminants is easier and the ability to remove contaminants is increased, the opposite arrangement is also possible. In this case,FIG.As shown in FIG. 5, a wider range in the plane direction can be covered by arranging a plurality of such well pairs PW and SW in the vertical direction at intervals in the horizontal direction.
[0059]
  On the contrary,FIG.As shown, the injection well PW and the suction well SW are arranged at intervals in the horizontal direction,steamIt is also possible to supply G and move pollutants. in this case,FIG.As shown in FIG. 4, by arranging a plurality of sets of lateral wells PW and SW at intervals in the vertical direction, it is possible to perform a construction covering a wider depth range.
[0060]
  On the other hand, although not shown, in the present invention, the injection well and the suction well can also be constructed by arc-shaped drilling using an arc-shaped drilling shaft.
[0061]
  This book2Since other points such as the construction procedure in the embodiment are the same as those in the first embodiment, description thereof will be omitted.
[0062]
  (Other forms)
  Similar to the injection, suction can be performed only in a limited range. In this case, the same structure as the injection device of the above embodiment can be used for suction. In this case, the suction position is adjusted to the same depth position as the injection position (the suction device is moved when the depth position of the injection tube is moved), or a different depth position is set.steamCan be passed in an oblique direction.
[0063]
  In addition, as described above, as the form of the well, it is possible to adopt a linear thing, a thing composed of a curved part and a straight part, an arc-shaped thing, but appropriately select these within one construction region, It can also be combined. For example, in one construction area, a straight injection well and a suction well and an injection well and a suction well composed of a curved portion and a straight portion are provided, or the injection well is a straight well, and the suction well Can be a well composed of a curved portion and a straight portion.
[0064]
【The invention's effect】
  As described above, according to the present invention, it is possible to remove pollutants more effectively and efficiently.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an outline of contaminant removal.
FIG. 2 is a cross-sectional view showing an outline of a double-tube packer type injection device.
FIG. 3 is a cross-sectional view showing an outline of a drilling process.
FIG. 4 is a cross-sectional view showing an outline of a strainer installation process.
FIG. 5 is a cross-sectional view showing an outline of an installation process of an injection device and the like.
FIG. 6 is a cross-sectional view showing an outline of a packer bulging process.
[Fig. 7]steamIt is sectional drawing which shows the outline | summary of an injection | pouring process.
[Fig. 8]steamIt is a principal part expanded sectional view in an injection | pouring process.
FIG. 9 is a cross-sectional view showing an outline of another injection form.
FIG. 10It is sectional drawing which shows the outline | summary of 2nd Embodiment.
FIG. 11It is sectional drawing which shows the drilling principle.
FIG.It is sectional drawing which shows the outline | summary of a well arrangement | sequence form.
FIG. 13It is sectional drawing which shows the outline | summary of another well arrangement | sequence form.
FIG. 14It is sectional drawing which shows the outline | summary of another well arrangement | sequence form.
FIG. 15It is sectional drawing which shows the outline | summary of another well arrangement | sequence form.
[Explanation of symbols]
  6 ... packer, 10 ... injection outer tube, 20 ... injection inner tube, SW ... suction well, PW ... injection well, G ...steam.

Claims (4)

In removing contaminants held in the ground, an injection well and a suction well are provided at intervals in a range extending from the region to be removed to the vicinity thereof, and steam is injected from the injection well, while the suction well In the method of sucking out and removing contaminants from
A strainer is installed in each of the injection well and the suction well,
A plurality of packers spaced apart in the axial direction are provided on the outer surface, and an injection outer tube having an injection port between the packers is inserted into a strainer installed in the injection well, and the suction well Insert the suction device into the installed strainer,
Sealing the gap between the hole wall of the injection well and the outer pipe at the mouth of the injection well, and sealing the gap between the hole wall of the suction well and the suction device at the mouth of the suction well,
Inflating the packer of the outer injection tube to seal the front and back between the packer,
An injection inner tube having a vapor discharge port and means for liquid-tightly adhering the axial front and rear of the discharge port to the inner surface of the injection outer tube is inserted into the injection outer tube, and the discharge port of the injection inner tube In the state where the axial front and back are in liquid-tight contact with the inner surface of the injection outer tube and the discharge port of the injection inner tube is in communication with the injection port of the injection outer tube, steam is pumped to the injection inner tube. It is discharged from the discharge port, and the discharged vapor is infused into the removal target region through the injection port of the injection outer tube.
A method for removing pollutants. The contaminant removal method according to claim 1, wherein suction by the suction device is performed from the suction position in a state where a predetermined position in the depth direction of the suction well is set as a suction position and the front and rear of the suction position are sealed . Examples infusion outer tube, has the packer to at least three positions spaced in the axial direction, and with one having the inlet respectively between each packer,
Sequentially or performs the osmotic simultaneously injected from the injection port between the packers, and this time, to perform the penetration injected each in a separate injection conditions for each between the packers, contaminant removal according to claim 1 or 2, wherein Method. The pollution according to any one of claims 1 to 3, wherein the pollutant is at least one of a volatile pollutant, a non-volatile water-soluble pollutant, and a non-volatile water-insoluble pollutant. Substance removal method.

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