JP6722493B2 - Oil recovery method - Google Patents

Description

The present invention relates to a method for recovering oils in the ground.

Conventionally, as a method of recovering oil in the ground, there are a method of recovering oil floating in a well in an oil recovery well (for example, refer to Patent Document 1) and a method using a well point. In addition, there is also a method of installing a liquid injection well separately from the pumping well and enhancing the hydraulic gradient to promote horizontal movement of oil (for example, refer to Patent Documents 2 and 3). Further, a sparging well is installed and air is injected to raise the groundwater level to enhance the hydraulic gradient and promote oil movement in the horizontal direction (see, for example, Patent Document 4), and the pumping well is sealed. There are things such as vacuum suction. In these methods, basically, a well is installed and a hydraulic gradient is provided around the well to move the oil in the formation and recover the oil collected with the groundwater.

Japanese Patent No. 3377417 JP, 2010-119917, A JP2012-143828A JP, 2007-253058, A

However, since the oil layer is generally highly viscous, the horizontal movement in the formation is very slow, and the installation interval of the pumping wells is about 10 m at the minimum, which makes it difficult to install in a narrow interval. The ratio of recoverable oil to the amount of pumped water was extremely low.

Well points can be installed with high density, but the suction range is limited to the screen part at the tip, so there was a problem that the suction range could not follow when the oil layer width and depth increased and decreased. In addition, iron bacteria and the like adhered to the vicinity of the suction port when the suction was advanced, and the suction port was likely to be closed.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to be able to install pumping points at a high density, to follow changes in the oil layer position, and efficiently from the ground. An object of the present invention is to provide an oil recovery method capable of recovering oil.

To achieve the above object, the first invention is a method of recovering oils in the earth plate, a step a of pouring the scope of the ground the drain member at a predetermined interval, said drain member And a step b of monitoring the content of oils while suctioning by connecting to a vacuum pump, the drain material is a water-repellent plastic drain or paper drain, and the water-repellent treatment is The method for recovering oils is characterized in that the drain material is impregnated with a water-repellent resin and applied to increase the contact angle of pure water between 100° and 145°.
A second invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and a step of connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, wherein the drain material is a plastic drain or a paper drain to which an oil-soluble film is attached, and the oil-soluble film is a silicone grease, a polypropylene film, or a polyethylene film. , An ethylene-vinyl acetate copolymer resin film is used.
A third invention is a method of recovering oils in the ground, which comprises a step a of placing a drain material in a target range of the ground at predetermined intervals, and connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, wherein a first sealing material is provided at a boundary portion between the drain material and the drain material cap, and a second sealing material is provided at a lower end portion of the drain material. In the drain material, a portion between the first sealing material and the second sealing material functions as a suction portion, and the suction portion is arranged at different depths in the ground in the step a. As described above, a plurality of the drain materials are cast, and in the step b, the content of oils is monitored by grasping the ratio of oil, water and air in the liquid sucked by the drain material, From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. Is a method of recovering oils.
A fourth invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target range of the ground at predetermined intervals, and connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, wherein the vacuum pump is a pump having no air-driven ignition source or an electric drive pump of explosion-proof type using a safety-enhanced explosion-proof motor , In step a, a plurality of the drain materials are placed so that the suction portions are arranged at different depths in the ground, and in step b, the oil, water, and air in the liquid sucked by the drain material are placed. By monitoring the content of oils by grasping the ratio of the oil content and the result of the monitoring, if it is determined that the depth of the oil layer has increased or decreased, the drain material corresponding to the depth of the oil layer is selected each time. Is carried out by suction, and the remaining drain material is interrupted by suction, which is a method for recovering oils.
A fifth invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and a step of connecting the drain material to a vacuum pump and sucking the drain material. And a step b of monitoring the content of oils, and a water blocking wall is provided on the outer periphery of the oil recovery target range in the ground, and in step a, the suction portion is arranged at a different depth in the ground. As described above, a plurality of the drain materials are cast, and in the step b, the content of oils is monitored by grasping the ratio of oil, water and air in the liquid sucked by the drain material, From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. Is a method of recovering oils.
A sixth invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, wherein a first sealing material is provided at a boundary portion between the drain material and the drain material cap, and a second sealing material is provided at a lower end portion of the drain material. In the drain material, a portion between the first sealing material and the second sealing material functions as a suction portion, and the suction portion is arranged at different depths in the ground in the step a. As described above, a plurality of the drain materials are cast, and in the step b, the content of oils is monitored by measuring the electric conductivity of the liquid sucked by the drain material, and from the result of the monitoring, When it is determined that the depth of the oil layer has increased or decreased, the drain material corresponding to the depth of the oil layer is selected and suctioned each time, and the remaining drain material interrupts the suction. Is the method of collection.
A seventh invention is a method of recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and a step of connecting the drain material to a vacuum pump and sucking the drain material. And a step b of monitoring the content of oils, wherein the vacuum pump is a pump having no air-driven ignition source or an electric drive pump of explosion-proof type using a safety-enhanced explosion-proof motor, In step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground, and in step b, the electrical conductivity of the liquid sucked by the drain material is measured. By monitoring the content of oils by the above, from the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suctioned, and the remaining The drain material is a method for recovering oils, characterized in that suction is interrupted.
An eighth invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, and a water blocking wall is provided on the outer periphery of the oil recovery target range in the ground, and in step a, the suction portion is arranged at a different depth in the ground. As described above, a plurality of the drain materials are cast, and in the step b, the content of oils is monitored by measuring the electric conductivity of the liquid sucked by the drain material, and from the result of the monitoring, When it is determined that the depth of the oil layer has increased or decreased, the drain material corresponding to the depth of the oil layer is selected and suctioned each time, and the remaining drain material interrupts the suction. Is the method of collection.
A ninth invention is a method for recovering oils in the ground, which comprises a step a of placing a drain material in a target area of the ground at a predetermined interval, and connecting the drain material to a vacuum pump to suck the drain material. And a step b of monitoring the content of oils, wherein a first sealing material is provided at a boundary portion between the drain material and the drain material cap, and a second sealing material is provided at a lower end portion of the drain material. A portion of the drain material between the first seal material and the second seal material functions as a suction portion, and the drain material is a plate-shaped core material and a surface of the core material. In the method for collecting oils, the cross-section of the lower end of the drain material is exposed without being covered with the filter portion.

In the present invention, by using the drain material without using a well for oil suction, inexpensive and quick construction can be facilitated, and oil suction points can be installed with high density. Further, since the suction portion of the drain material has a predetermined length in the depth direction, the suction range can follow the oil layer even when the width or depth of the oil layer increases or decreases. Since the suction part of the drain material has a predetermined length, clogging of the suction part is less likely to occur as compared with the case of using a well point for performing suction with a strainer at the tip.

By then attach any oil soluble membrane or subjected to water-repellent to Doreen material increasing water repellency and lipophilicity of the filter portion, it is possible to suck the oil in the ground more selectively.

By providing the first sealing material and the second sealing material, it is possible to minimize the intrusion of air and water into the drain material from the boundary portion between the drain material and the cap and the lower end portion of the drain material.
In addition, the depth of the oil layer can be increased by placing a plurality of drain materials so that the suction section is arranged at different depths in the ground, or by placing a plurality of drain materials with different suction section lengths. Even when it goes up and down, it is possible to collect oils by selecting and operating the drain material in which the suction part is located at the depth corresponding to the oil layer.

Select the drain material that performs suction and the drain material that suspends suction based on the ratio of oil to water and air in the liquid drawn by the drain material, the electrical conductivity of the liquid, the groundwater level grasped using the well, etc. In this case, it is possible to efficiently collect oil by saving excess drainage and suction energy.

In the present invention, in the step b, a part of the drain material may be stopped from being sucked to perform the liquid injection or the air injection.
By injecting or injecting oil, it is possible to facilitate the movement of oil that is difficult to move in the horizontal direction, and to improve the collection efficiency by suction. In addition, if necessary, in order to obtain the effect of backwashing, it is possible to perform liquid injection/air injection to restore the pumping capacity.

ADVANTAGE OF THE INVENTION According to this invention, the pumping location can be installed in high density, the fluctuation|variation of an oil layer position can be tracked, and the oil recovery method which can collect an oil component efficiently from the ground can be provided.

Diagram showing the outline of the recovery device 2 Diagram showing the arrangement of drain material 1 The figure which shows the example which used the impermeable wall 36. The figure which shows the outline of the collection device 2a The figure which shows the outline of the collection device 2b

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of the recovery device 2, and FIG. 2 is a diagram showing the arrangement of the drain material 1. FIG. 1 is a cross-sectional view taken along the arrow BB shown in FIG. FIG. 2 is a sectional view taken along the arrow AA shown in FIG.

As shown in FIGS. 1 and 2, the recovery device 2 includes a plurality of drain members 1, a hose 11, a valve 13, a liquid injection hose 15, a liquid supply tank 17, a liquid discharge hose 19, a vacuum pump 21, and a water treatment facility 23. , A separate tank 25, a well 35, and the like.

As shown in FIG. 2, the drain material 1 is driven in the oil recovery target range of the ground 9 at a predetermined interval in the front, rear, left, and right. The distance between the drain members 1 is, for example, about 1 m. The drain material 1 includes a plate-shaped core material and a filter non-woven fabric portion that covers the surface of the core material. Since the drain material 1 has a high lipophilicity, it is based on the material of the filter non-woven fabric part which can be expected to have a relatively water-repellent effect, but it is also possible to use a plastic drain or paper drain with further improved water repellency. is there. The contact angle of the basic material easily passes through the material so that it cannot be measured with oil, whereas it has a condition of 80° or more for water. The contact angle is measured by observing the situation when one drop of liquid is placed on the material with an optical mirror and measuring the angle with a CA-S micro 2 type single fiber contact angle meter.

In order to enhance the water repellency and lipophilicity of the drain material 1, for example, a water repellent additive or a lipophilic additive is used. The water-repellent additive is a water-repellent component such as a fluororesin or a silicone resin, and the water-repellent performance of the filter non-woven fabric part can be reduced by subjecting the filter non-woven fabric part to a water-repellent treatment using these resins or the like. .. In particular, a non-woven fabric, which is a three-dimensional fiber aggregate, is characterized by having a large number of minute voids, so that the effect of water repellent treatment on the fiber surface is great, and oil-water separation is facilitated. Further, the lipophilic additive is a silicone grease, a polypropylene film, a polyethylene film, an ethylene-vinyl acetate copolymer resin film, etc., and by sticking these oil-soluble films to the filter nonwoven fabric part, Oil can be preferentially recovered by dissolving only the membrane.

The filter part of the drain material 1 has a function of collecting only the liquid from the soil into the drain material 1, and the nonwoven fabric which is a porous body is good in that it has excellent filtering performance. The open pore size of the non-woven fabric may be any pore size that prevents the inflow of soil particles, and is preferably 100 μm or less in order to function the water repellent effect and prevent the inflow of soil particles in the ground containing fine particles such as clay and silt. .. In order to efficiently perform the water collecting function, it is sufficient that the water permeability coefficient is 1.0×10 ⁻² cm/sec or more of the sand ground, and the opening diameter in that case is about 30 μm or more, but a more precise filtration function is required. This is not the case if it is necessary.

As shown in FIG. 1, a cap 5 is attached to the upper end of the drain member 1. A first sealing material 7 is provided at the boundary between the drain material 1 and the cap 5. The first sealing material 7 prevents the inflow of air or the like from the gap between the drain material 1 and the cap 5, and the drain material 1 is coated with a waterproof material such as a stretched PP film or an epoxy resin. The sealing property of the connecting cap 5 is improved. In order to prevent the inflow of air or the like from the gap between the drain material 1 and the cap 5, the method of coating the water blocking material is not limited, and the gap may be airtight. As a method of providing airtightness, for example, the shape of the cap 5 may be a shape in which the entire upper surface of the drain material 1 is covered, or a water-stopping material such as sponge or rubber that has followability may be used. It may be filled between the cap and the cap 5, and may be adhered or welded so as to improve the adhesion between them.

A second seal material 3 is provided at the lower end of the drain material 1. The second sealing material 3 is epoxy resin or the like. In the cross section of the lower end of the drain material 1, the core material is exposed without being covered with the filter non-woven fabric in the state where the second seal material 3 is not provided, so that water is easily absorbed. By providing the second sealing material 3, the inflow of water from the cross-sectional portion of the lower end of the drain material 1 into the drain material 1 is prevented. In order to prevent the inflow of water or the like from the lower part of the drain material 1, a cap made of plastic, rubber, or the like may be fitted in addition to the use of the sealing material, or a form covered with a waterproof film may be used. It is also possible to eliminate the gap in the lower portion of the drain material 1 by welding, pressure bonding or the like.

As shown in FIG. 1, in the drain material 1, the portion between the first sealing material 7 and the second sealing material 3 functions as the suction portion 33. The length of the suction unit 33 is, for example, about 30 to 50 cm, and is set according to the target oil layer thickness. The drain material 1 is preferably placed in the ground 9 so that the suction portion 33 is located in the oil layer 27.

As shown in FIG. 1, the tip of the cap 5 of the drain member 1 is connected to the lower end of the hose 11. The upper end of the hose 11 is connected to the valve 13. A liquid injection hose 15 a branched from a liquid injection hose 15 and a liquid drain hose 19 a branched from a liquid drain hose 19 are connected to the valve 13. The liquid injection hose 15 is connected to the liquid supply tank 17. The drain hose 19 is connected to the separate tank 25. The separate tank 25 is connected to the vacuum pump 21 via the drain hose 19b and to the water treatment facility 23 via the drain hose 19c. The drainage hose 19 is connected to the observation tank 22 by two drainage hoses 19 d that branch before the separate tank 25. A valve 26 is provided on the two drainage hoses 19d. Further, the drainage hose 19 is provided with a valve 24 between the two drainage hoses 19d and a branch point.

In order to prevent the inflow of oil or vaporized gas from the separate tank 25 to the vacuum pump and enhance the explosion-proof effect, a water-cooling steel pipe is installed on the outside for water cooling as necessary, or the separate tank 25 and the vacuum pump 21 It is also possible to cool the drainage hose 19b between and with an air cooler.

The vacuum pump 21 may be an air-driven pump that does not have an ignition source, an explosion-proof electric drive pump that uses a safety-enhanced explosion-proof motor, or the like.

In order to recover the oil of the ground 9, first, the drain material 1 is driven in a target area of the ground 9 at a predetermined interval, and the recovery device 2 as shown in FIG. 1 is prepared. Then, the vacuum pump 21 is operated with the valve 24 opened and the valve 26 closed, and the drain material 1 sucks the liquid from the oil layer 27 of the ground 9. If necessary, the valve 24 may be closed, the vacuum pump 21 may be operated with the valve 26 open, the liquid may be sucked, and the sucked liquid may be observed in the observation tank 22. The liquid pumped up by the vacuum pump 21 is separated into a gas and a liquid in the separate tank 25, and the liquid is collected in the water treatment facility 23. The liquid is separated into water and oil in the water treatment facility 23, and is reused or drained depending on the situation.

When the vacuum pump 21 is operated to suck the liquid from the oil layer 27 of the ground 9 by the drain material 1, the content of oils in the liquid of the liquid sucked by each drain material 1 is monitored while performing the suction. The content of oils in the liquid sucked by each drain material 1 may be monitored by visually observing the liquid in the observation tank 22, or the ratio of oil, water, and air in the liquid may be adjusted to determine the concentration or the ratio. It may be carried out by grasping using specific gravity. Further, in parallel with monitoring the content of oils in the liquid, the well 35 is used to grasp the groundwater level of the aquifer 29 of the ground 9 and the oil layer thickness of the oil layer 27.

In the monitoring by the recovery device 2, for example, the relative and local concentration distribution of the oils remaining in the target range is grasped from the ratio of oil, water, and air in the liquid sucked by each drain material 1. Then, based on the grasped concentration distribution and the groundwater level and the oil layer thickness of the ground 9 grasped using the well 35, the drain material 1 for suction from the plurality of drain materials 1 and the drain material 1 to be interrupted are selected. Further, if necessary, the drain material 1 whose suction has been interrupted is injected or injected with hot water or the like from the liquid supply tank 17. The injection is performed using water, warm water, or a liquid or gas containing a component that reduces the viscosity of oils or improves the fluidity.

As described above, in the first embodiment, by using the drain material 1 without using a well for oil pumping, the recovery device 2 can be easily constructed. If the collecting device 2 is used, it is possible to perform suction at a plurality of places with one collecting device, and it is possible to install pumping places at a high density. Moreover, since the suction part 33 of the drain material 1 has a predetermined length in the depth direction, even when the width or depth of the oil layer 27 increases or decreases, the suction range can follow the oil layer. Since the suction part 33 has a predetermined length, the drain material 1 can be sucked on the surface, and the suction part 33 is less likely to be clogged, as compared with the case where suction is performed at a point.

In the first embodiment, by using the drain material 1 having improved water repellency and lipophilicity, it is possible to selectively suck the oil in the ground 9. Further, by providing the first sealing material 7 and the second sealing material 3, water and air can be prevented from entering the drain material 1 from the boundary portion between the drain material 1 and the cap 5 and the lower end portion of the drain material 1. Can be minimized.

In the first embodiment, the content of oils is monitored by visually observing the liquid sucked by the drain material 1 or by measuring the ratio of oil, water and air in the liquid, and the well 35 is By grasping the groundwater level and the oil layer thickness of the ground 9 by using them, it becomes possible to select the drain material 1 that performs suction and the drain material 1 that suspends suction based on these. If only the drain material 1 suitable for suction is selected and operated, extra drainage and suction energy can be saved, and oil can be efficiently collected.

In addition, by connecting the liquid injection hose 15a and the drainage hose 19a to each drain material 1 via the valve 13, the suction of a part of the drain material 1 of the plurality of drain materials 1 is stopped, and the drain material 1 is injected. It becomes possible to perform liquid or insufflation. By injecting or injecting oil, oil that is difficult to move horizontally in the ground 9 can be easily moved, and the oil recovery efficiency by suction can be improved. In addition, in order to obtain the effect of backwashing, it is possible to use it for injecting and injecting air to recover the pumping capacity.

In addition, in the first embodiment, only the recovery device 2 is provided on the ground 9, but the recovery device 2 and the impermeable wall may be used together. FIG. 3 is a diagram showing an example in which the impermeable wall 36 is used. In the example shown in FIG. 3, an impermeable wall 36 is provided on the outer periphery of the oil recovery target range in the ground 9. By providing the impermeable wall 36, it is possible to prevent the influence of the operation of the recovery device 2 from reaching the outside of the oil recovery target range.
Further, a method of coating the surface layer of the soil layer with a water blocking material to enhance suction efficiency may be used.

As a method of adding water repellency and lipophilicity to the drain material 1, a non-woven fabric made of hydrophobic or lipophilic polypropylene, polyethylene, polyester, polyamide, acrylic, or glass fiber may be used for the filter. A non-woven fabric made of fibers impregnated with a lipophilic component or coated fibers may be used. Further, the drain material 1 may be infiltrated with a fluid having lipophilicity and water repellency in advance. For example, when the filter material of the drain material 1 is polyester, the contact angle of pure water is from 80° to 100° before coating to 130° after coating/drying by impregnating the fluororesin as a water repellent component. The contact angle of liquid paraffin dropped to almost 0° by infiltration with oils such as liquid paraffin and kerosene, and the contact angle of pure water from 80° to 100° before infiltration after infiltration Is 100° to 140°, and lipophilicity and water repellency are significantly improved.

Furthermore, the method of monitoring the content of oils is not limited to the method described above. For example, the monitoring may be performed by measuring the electric conductivity of the liquid passing through each drain material 1 or the drainage hose 19a connected to each drain material 1. In this case, the suction of the drain material 1 in which the ratio of oil in the sucked liquid is higher than a predetermined value is interrupted. Stopping and starting suction of each drain material 1 based on the electric conductivity of the sucked liquid may be automatically controlled.

Next, a second embodiment will be described. FIG. 4 is a diagram showing an outline of the recovery device 2a. FIG. 4A is a diagram showing the arrangement of the drain members 1a, 1b, 1c, and FIG. 4B is a sectional view taken along the arrow CC shown in FIG. 4A.

The recovery device 2a has substantially the same configuration as the recovery device 2 shown in FIG. 1, but instead of the plurality of drain members 1 having the same suction part length, as shown in FIG. A plurality of drain materials 1a, 1b, 1c having different lengths are used. As the drain materials 1a, 1b, 1c, a plastic drain or a paper drain having improved water repellency and lipophilicity can be used, and it is placed on the ground 9. As shown in FIG. 4A, the drain materials 1a, 1b, and 1c are arranged such that the drain materials having different suction unit lengths are adjacent to each other.

In order to recover the oil of the ground 9, first, as shown in FIG. 4, the drain materials 1a, 1b, 1c are set at predetermined intervals in the oil recovery target range of the ground 9, and the recovery device 2a is prepared. To do. Then, a vacuum pump (not shown) is operated to suck the liquid from the oil layer 37c of the ground 9 with the drain materials 1a, 1b, 1c. The liquid pumped up by the vacuum pump is separated into water and oil by the same method as in the first embodiment.

When the liquid is sucked from the oil layer 37c of the ground 9 by the drain materials 1a, 1b, 1c, the content of oils in the liquid is monitored for the liquid sucked by the drain materials 1a, 1b, 1c. The oil content is monitored by visual inspection or various measurements as in the first embodiment. Further, the well 35 is used to grasp the groundwater level and the oil layer thickness of the aquifer of the ground 9.

In the recovery device 2a, the oil is extracted from the monitoring result of the ratio of oil/water/air in the liquid sucked by the drain materials 1a, 1b, 1c and the groundwater level and the oil layer thickness of the ground 9 grasped using the well 35. When it is determined that the lower surface of the oil layer 37c has risen due to the recovery of the waste, the suction of the drain material 1c is interrupted. Then, the content of oils in the liquid is monitored while sucking the liquid from the oil layer 37b using the drain materials 1a and 1b. At this time, if necessary, the drain material 1c for which the suction has been interrupted is infused or aerated from the liquid supply tank.

Further, when it is determined that the lower surface of the oil layer 37b further rises due to the recovery of oils using the drain materials 1a and 1b, suction of the drain material 1b is also interrupted. Then, while the liquid is sucked from the oil layer 37a using the drain material 1a, the content of oils in the liquid is monitored. At this time, if necessary, the drain material 1b, 1c for which the suction has been interrupted is injected or aerated from the liquid supply tank.

As described above, in the second embodiment, the plurality of drain materials 1a, 1b, and 1c having different lengths of the suction portion are placed on the ground 9, so that the suction range can be increased or decreased even when the depth of the oil layer increases or decreases. Can follow the oil layer.

Next, a third embodiment will be described. FIG. 5 is a diagram showing an outline of the recovery device 2b. FIG. 5A is a diagram showing the arrangement of the drain members 1d, 1e, 1f, and FIG. 5B is a sectional view taken along the arrow D-D shown in FIG. 5A.

The recovery device 2b has substantially the same configuration as the recovery device 2 shown in FIG. 1, but as shown in FIG. 5(b), instead of the plurality of drain members 1 arranged so that the suction portions have the same depth. A plurality of drain members 1d, 1e, 1f whose suction portions are arranged at different depths are used. As the drain materials 1d, 1e, 1f, a plastic drain or a paper drain having improved water repellency and lipophilicity can be used, and the drain members 1d, 1e, 1f are placed on the ground 9 so that the suction portions are arranged at different depths. For example, as shown in FIG. 5A, the drain materials 1d, 1e, 1f are arranged so that the drain materials having different suction portion depths are adjacent to each other.

In order to collect the oils of the ground 9, first, as shown in FIG. 5, the drain materials 1d, 1e, 1f are set in the oil recovery target range of the ground 9 at predetermined intervals to prepare the recovery device 2b. To do. Then, the position of the oil layer is grasped from the groundwater level and the oil layer thickness of the aquifer of the ground 9 grasped using the well 35, and the vacuum pump is operated to perform suction with the drain material. For example, when the oil layer is located at the oil layer 37d, the drain material 1d is used. When the oil layer 37e is located, the drain material 1e is used. When the oil layer 37f is located, the drain material 1f is used. Suction. In addition, if necessary, the drain material whose suction has been interrupted is injected or aerated from the liquid supply tank. The liquid pumped up by the vacuum pump is separated into water and oil by the same method as in the first embodiment.

When the liquid is sucked from the oil layers 37d, 37e, 37f of the ground 9 by the drain materials 1d, 1e, 1f, the liquid sucked by the drain materials 1d, 1e, 1f contains oils contained in the liquid. To monitor. The oil content is monitored by visual inspection or various measurements as in the first embodiment.

In the recovery device 2b, for example, from the monitoring result of the ratio of oil/water/air in the liquid sucked by the drain materials 1a, 1b, 1c, the groundwater level and the oil layer thickness of the ground 9 grasped using the well 35, and the like. When it is determined that the depth of the oil layer has increased or decreased due to the progress of oil recovery or groundwater level fluctuation, the drain material corresponding to the depth of the oil layer is selected and suction is performed each time. Suction of the remaining drain material is interrupted, and if necessary, liquid injection or insufflation is performed from the liquid supply tank to the drain material for which suction has been interrupted.

As described above, in the third embodiment, even when the depth of the oil layer is increased or decreased by driving the plurality of drain materials 1d, 1e, 1f having the suction portions arranged at different depths on the ground 9. The suction range can follow the oil layer.

Also in the second and third embodiments, a drain material is used without using a well for pumping water, a drain material having improved water repellency and lipophilicity is used, a boundary portion between the drain material and the cap, and a drain material. A sealing material is provided at the lower end of the drain, the content of oils in the liquid sucked by the drain material is monitored visually and by various measurements, the groundwater level and oil layer thickness are grasped using the well 35, and a valve is provided for each drain material. The same effect as that of the first embodiment can be obtained by connecting the liquid injection hose and the liquid drain hose through the connection.

In addition, also in the second and third embodiments, a water shield wall may be provided on the outer periphery of the oil recovery target range in the ground 9, similarly to the example shown in FIG. The method for enhancing the water repellency and lipophilicity of the drain material 1 is the same as in the first embodiment, and the filter is a nonwoven fabric made of polypropylene, polyethylene, polyester, polyamide, acrylic, or glass fiber having hydrophobicity or lipophilicity. Alternatively, a non-woven fabric made of fibers impregnated with a water-repellent or lipophilic component or a coated fiber may be used. Further, as a method of enhancing water repellency and lipophilicity, the drain material 1 may be previously infiltrated with a fluid having lipophilicity and water repellency.

Further, also in the second and third embodiments, the method of monitoring the content of oils in the liquid sucked by the drain material is not limited to the above method. Monitoring is performed by measuring the electrical conductivity of the liquid that passes through each drain material or the drain hose connected to each drain material, and the suction of each drain material is checked based on the electrical conductivity of the aspirated liquid. Stopping and starting may be controlled automatically.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not affected by the above-described embodiments. It is obvious to those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and naturally, those modifications are also within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b, 1c, 1d, 1e, 1f...Drain material 2, 2a, 2b.........Recovery device 3, 7... Seal material 5... Cap 9... Ground 11... Hose 13…………Valve 15, 15a…………Water injection hose 17…………Liquid supply tank 19, 19a, 19b, 19c…………Drainage hose 21…………Vacuum pump 22…………Observation layer 23………… Water treatment facility 25... Separate tank 27, 37a, 37b, 37c, 37d, 37e, 37f... Oil layer 29... Aquifer 31... Air layer 33... Suction section 35... Well 36.........Impermeable wall

Claims (12)

A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
The drain material is a water-repellent plastic drain or paper drain,
The water-repellent treatment is performed by impregnating the drain material with a resin of a water-repellent component and applying the resin to increase a contact angle of pure water between 100° and 145°. Method. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
The drain material is a plastic drain or paper drain with an oil-soluble film attached,
A method for recovering oils, wherein the oil-dissolving film is any one of silicone grease, polypropylene film, polyethylene film, and ethylene-vinyl acetate copolymer resin film. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
A first seal material is provided at a boundary portion between the drain material and the cap of the drain material, and a second seal material is provided at a lower end portion of the drain material,
In the drain material, a portion between the first sealing material and the second sealing material functions as a suction portion ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by grasping the ratio of oil, water and air in the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
The vacuum pump uses an explosion-proof electric drive pump that uses a pump that does not have an air-driven ignition source or a safety-enhanced explosion-proof motor ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by grasping the ratio of oil, water and air in the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
An impermeable wall is provided on the outer periphery of the oil recovery target range in the ground ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by grasping the ratio of oil, water and air in the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. In the step b, by observing the liquid sucked by the drain member at observation vessel, in any of the preceding claims 3, characterized by monitoring the content of the oils in the liquid The method for recovering the described oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
A first seal material is provided at a boundary portion between the drain material and the cap of the drain material, and a second seal material is provided at a lower end portion of the drain material,
In the drain material, a portion between the first sealing material and the second sealing material functions as a suction portion ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by measuring the electric conductivity of the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
The vacuum pump uses an explosion-proof electric drive pump that uses a pump that does not have an air-driven ignition source or a safety-enhanced explosion-proof motor ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by measuring the electric conductivity of the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
An impermeable wall is provided on the outer periphery of the oil recovery target range in the ground ,
In the step a, a plurality of the drain materials are placed so that the suction parts are arranged at different depths in the ground,
In step b, the content of oils is monitored by measuring the electric conductivity of the liquid sucked by the drain material,
From the result of the monitoring, when it is determined that the depth of the oil layer has increased or decreased, each time, the drain material corresponding to the depth of the oil layer is selected and suction is performed, and the remaining drain material is interrupted suction. And a method for recovering oils. A method of collecting oils in the ground,
Step a in which the drain material is placed at a predetermined interval in the target area of the ground,
A step b of monitoring the content of oils while sucking the drain material by connecting it to a vacuum pump,
Equipped with,
A first seal material is provided at a boundary portion between the drain material and the cap of the drain material, and a second seal material is provided at a lower end portion of the drain material,
In the drain material, a portion between the first sealing material and the second sealing material functions as a suction portion ,
The drain material is composed of a plate-shaped core material and a filter part that covers the surface of the core material, and the cross-section of the lower end of the drain material is exposed without the core material being covered with the filter part. A method for recovering oils, which is characterized in that The method for recovering oils according to any one of claims 1 to 10 , wherein in the step a, a plurality of the drain materials having different suction section lengths are placed. The oil according to any one of claims 1 to 11 , wherein in the step b, suction of a part of the drain material is stopped to perform liquid injection or air injection. Recovery method.

Images