CN112453047A - Infiltration increasing method for shallow contaminated soil - Google Patents
Infiltration increasing method for shallow contaminated soil Download PDFInfo
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- CN112453047A CN112453047A CN202011214908.4A CN202011214908A CN112453047A CN 112453047 A CN112453047 A CN 112453047A CN 202011214908 A CN202011214908 A CN 202011214908A CN 112453047 A CN112453047 A CN 112453047A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention provides a permeation enhancing method for shallow polluted soil. The infiltration enhancing method comprises the following steps: injecting high-viscosity fluid into shallow soil body, and controlling the area of shallow polluted soil to be 700m2The injection amount of the high-viscosity fluid is 5m3‑10m3(ii) a Injecting liquid nitrogen into the same liquid injection point in the shallow soil body, wherein the area of the shallow polluted soil is 700m2The injection amount of liquid nitrogen is 2m3‑5m3(ii) a Injecting liquid carbon dioxide into the same injection point in the shallow soil body to ensure that the area of the shallow polluted soil is 700m2The amount of liquid carbon dioxide injected was 5m3‑10m3(ii) a And repeatedly injecting high-viscosity fluid-liquid nitrogen-liquid carbon dioxide at the same injection point until the crack propagation reaches the expected requirement. The infiltration increasing method can effectively increase the permeability of the soil, thereby improving the mass transfer capacity of the repairing agent and improving the repairing effect on the soil.
Description
Technical Field
The invention relates to a permeation increasing method, in particular to a permeation increasing method for shallow polluted soil, and belongs to the technical field of soil pollution remediation and treatment.
Background
The distribution range of the pollution sites in China is wide, the pollution treatment difficulty is high, and the efficiency, the cost and the repair degree of the existing repair technology cannot meet the requirements of social and economic development and national green development. At present, the treatment work of the polluted site in China is in a starting stage, the soil pollution treatment and restoration technology is not enough in reserve, in which the heterotopic restoration is mainly used, and the requirements of different development and utilization types of soil treatment and restoration cannot be met, so that the diversification of the in-situ restoration technology and the restoration technology needs to be explored.
The shallow low-permeability stratum has the problems of poor permeability, difficult material transmission and the like. Soil permeability directly determines the specific construction method and equipment used by the in situ chemical/oxidation technique, and thus determines construction costs. For low-permeability stratum, when the traditional in-situ chemical oxidation/reduction repair technology is adopted, the mass transfer effect of the repair agent is hindered by the low-permeability characteristic, so that the repair agent cannot effectively contact with a polluted area, and the repair efficiency is greatly reduced. The repairing agent is easy to generate a flow-around phenomenon, namely the repairing agent is easy to diffuse to heterogeneous bodies such as high-permeability stratum, cracks and the like, so that the repairing degree of a low-permeability area is low. Over time, the contaminants from the low permeability reservoir diffuse back to the high permeability zone, creating secondary pollution. Therefore, the remediation difficulty of the low-permeability polluted site is high, and the mass transfer capacity of the remediation agent needs to be increased by adopting a special technical means.
The environmental fracturing technology is a technology for inducing cracks in shallow bedrock or soil to increase the permeability of the cracks by utilizing a hydraulic fracturing technology so as to repair the soil. Currently, there are three common fracturing techniques for in situ remediation: firstly, hydraulic fracturing, wherein a guar gum sand fracturing fluid is pumped into a stratum to form a proppant to fill a fracture, and a single fracture is often formed; second, pneumatic fracturing, by pumping in high-pressure gas (air, N)2、CO2Etc.) a plurality of proppant-free fractures are formed, which have a short propagation distance; and thirdly, directly injecting fracturing, directly injecting a fracturing pipe column into the stratum, conveying the repairing agent to a specified position, directly injecting fracturing without cementing, and having simple construction, lower cost and short crack extension distance.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a soil remediation method which can effectively overcome the defects of short expansion distance and insufficient fracture forming capability of the existing fracturing technology due to high plasticity of soil.
In order to achieve the technical purpose, the invention firstly provides a permeation enhancing method of shallow polluted soil, which comprises the following steps:
injecting high-viscosity fluid into shallow soil body, and controlling the area of shallow polluted soil to be 700m2The injection amount of the high-viscosity fluid is 5m3-10m3；
Injecting liquid nitrogen into the same liquid injection point in the shallow soil body, wherein the area of the shallow polluted soil is 700m2The injection amount of liquid nitrogen is 2m3-5m3；
Injecting liquid carbon dioxide into the same injection point in the shallow soil body to ensure that the area of the shallow polluted soil is 700m2The amount of liquid carbon dioxide injected was 5m3-10m3；
The high viscosity fluid-liquid nitrogen-liquid carbon dioxide injection is repeated at the same injection point until the crack propagation reaches the expected requirement (the expected requirement can be predetermined by the skilled person according to the need of permeability increment).
The permeability increasing method of the invention forms a hydraulic main crack by injecting high viscosity fluid, improves the brittleness by injecting liquid nitrogen to freeze the soil around the crack, forms a pneumatic branch micro crack by injecting liquid carbon dioxide to fracture, finally increases the permeability of a low permeability stratum by repeatedly injecting the three fluids, and the permeability can be improved by more than 2 orders of magnitude.
The shallow soil body of the permeation enhancing method of the invention means that the buried depth in the polluted soil is less than 50m, and the permeability is 10-5-10- 8cm/s, heterogeneity comprises areas of thin inter-layers and lenticles.
In one embodiment of the present invention, the injection speed of the high viscosity fluid is 0.2m3/min-0.8m3/min；
The injection speed of the liquid nitrogen is 0.1m3/min-0.3m3/min；
The injection speed of the liquid carbon dioxide is 0.2m3/min-0.5m3/min。
In one embodiment of the invention, the infiltration enhancing method is performed by a concentric tube having an inner tube and an outer tube, wherein liquid nitrogen and liquid carbon dioxide are injected into the shallow soil body through the inner tube of the concentric tube, and a high viscosity fluid is injected into the shallow soil body through the outer tube of the concentric tube.
In one embodiment of the invention, the liquid carbon dioxide may be replaced with nitrogen or air.
In one embodiment of the present invention, the viscosity of the high viscosity fluid is from 300cp to 600 cp; more specifically, the high viscosity fluid is vegetable guar or polyacrylamide. Meanwhile, the high-viscosity fracturing fluid can carry quartz sand or ceramsite; the sand carrying rate is 75-85%, preferably 80%.
In one embodiment of the present invention, the infiltration enhancing method comprises the following steps:
completing well cementation on shallow soil;
after well cementation, perforating a shallow soil body through a casing to form an initial fluid channel between a well hole and a stratum;
setting a fracturing concentric tube in the sleeve, and sealing a fracturing section by using a packer;
the infiltration enhancing method for the shallow contaminated soil comprises the steps of injecting high-viscosity fluid through an outer pipe of a concentric pipe to form a main crack in a soil layer, then injecting liquid nitrogen through an inner pipe of the concentric pipe to freeze the main crack, injecting liquid carbon dioxide through the inner pipe of the concentric pipe to form a large number of branch cracks around a hydraulic main crack, and repeatedly injecting the high-viscosity fluid, the liquid nitrogen and the liquid carbon dioxide to finish the repair of the shallow soil.
In a specific embodiment of the invention, a packer is arranged between the outer pipe and the sleeve of the concentric pipe, and a packer is arranged between the inner pipe and the outer pipe of the concentric pipe; wherein, can set up two packers between the outer tube of concentric tube and the sleeve pipe, can set up two packers between the interior outer tube of concentric tube. And a sleeve packer is arranged between the outer pipe of the concentric pipe and the sleeve, and a concentric pipe packer is arranged between the inner pipe of the concentric pipe and the outer pipe of the concentric pipe. Wherein, the casing packer is made of high-pressure resistant and low-temperature resistant rubber materials; the concentric tube packer is made of a low temperature resistant rubber material.
In a specific embodiment of the invention, the distance between the casing packer and the perforation is 0.4m-0.6m, and the distance between the concentric pipe packer and the liquid nitrogen/carbon dioxide outlet is 0.2m-0.4 m.
In one embodiment of the invention, the inner pipe of the concentric pipes has a thermal insulating coating. The packer is a packer with good low temperature resistance and corrosion resistance.
In one embodiment of the invention, cementing comprises the steps of:
drilling a shallow soil body to form a borehole; and (3) setting a casing in the well bore, injecting cement slurry into the casing, reversely discharging the cement slurry to fill the annular space between the casing and the well wall, and completing well cementation after the cement slurry is solidified.
Among them, the cement slurry is preferably a quick setting cement.
In one embodiment of the invention, the perforation is performed by running a hydraulic sand blasting perforation string or gun in the casing to perforate the designated horizon. Wherein, the position, diameter, depth and density of the perforation can be adjusted according to the actual situation.
The invention also provides a method for restoring the shallow polluted soil, which comprises the step of implementing the infiltration enhancing method of the shallow polluted soil.
The invention relates to a method for increasing the permeability of shallow contaminated soil, which belongs to a method for increasing the permeability of a stratum in situ. Meanwhile, the liquid nitrogen is injected to freeze the soil, so that the brittleness of the soil can be increased, and the compressibility of the soil is improved.
According to the method for restoring the shallow contaminated soil, the soil body is subjected to infiltration increasing, so that the soil pollution can be effectively managed and restored, the permeability of the soil is improved, and the permeability can be improved by more than two orders of magnitude.
Drawings
FIG. 1 is a schematic diagram of a well pattern structure of the permeability increasing method for shallow contaminated soil according to example 1.
FIG. 2 is a schematic view showing a partial structure of concentric pipes used in the infiltration enhancing method for shallow contaminated soil according to example 1.
Description of the main figures:
1. a sand mixing tank; 2. a liquid tank; 3. a plunger pump; 4. a wellhead valve; 5. a booster pump; 6. a carbon dioxide cylinder; 7. a pipeline valve; 8. a liquid nitrogen tank; 9. a cement sheath; 10. a sleeve; 11. a concentric tube outer tube; 12. a concentric tube inner tube; 13. a casing packer; 14. a high viscosity fluid outlet; 15. a concentric tube packer; 16. a liquid nitrogen/carbon dioxide outlet; 17. a freezing zone; 18. an artificial fracture area; 19. perforating; 20. a hydraulic main fracture; 21. a pneumatic branching fracture; 22. and (4) a target soil layer.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
The embodiment provides a method for repeatedly fracturing shallow soil by using high-viscosity fluid-liquid nitrogen-liquid carbon dioxide, wherein the well pattern structure of the method is shown in figures 1 and 2, and the method comprises the following steps:
and a, drilling a target soil layer 22 of a shallow soil body to form a borehole, wherein the hole diameter of the borehole can reach 30cm and the drilling depth can reach 50m according to the field site requirement.
And b, setting a casing 10 in the borehole, injecting cement slurry through the casing 10, completely replacing the cement slurry into an annulus between the casing 10 and the borehole wall, and filling the annulus to form a cement sheath 9, thereby completing the well cementation.
And c, putting a hydraulic sand blasting perforating string or perforating gun into the casing 10, dragging the string or perforating gun from the bottom to the wellhead to sequentially perforate 19, wherein the depth of the target polluted soil layer is 15m, the orientation of the perforating 19 is 0 degree (namely the perforating is vertical to the casing 10), the diameter is 3cm, the density is 5 holes/m, and the depth is 1 m.
D, setting an outer concentric tube 11 and an inner concentric tube 12 in the casing 10, sealing an annular space between the outer concentric tube 11 and the casing 10 by a casing packer 13, wherein the distance between the casing packer 13 and a perforation is 0.2m, and enabling the plunger pump 3 to mix the sand tank 1 and the liquid tank 2 (filled with plant guar gum fracturing fluid, the viscosity is 400cp, and the injection rate is 0.5 m)3Min, injection quantity 10m3) The mixed sand-carrying fracturing fluid is pumped into the outer pipe 11 of the concentric pipe through the plunger pump 3, enters an annular space between the outer pipe 11 of the concentric pipe and the casing pipe 10 through the high-viscosity fluid outlet 14, and then enters the stratum through the perforation 19 to generate a hydraulic main fracture 20.
Step e, pressurizing the liquid nitrogen in the liquid nitrogen tank 8 by the booster pump 5 (the injection rate of the liquid nitrogen is 0.1 m)3Min, injection amount 2m3) Pumping a concentric tube inner tube 12, sealing the concentric tube inner tube 12 and the concentric tube outer tube 11 by a concentric tube packer 15, enabling the distance between the concentric tube packer 15 and a liquid nitrogen/carbon dioxide outlet 16 to be 0.2m, enabling liquid nitrogen to enter an annular space between the concentric tube outer tube 11 and the concentric tube inner tube 12 through the liquid nitrogen/carbon dioxide outlet 16, enter an annular space between the concentric tube outer tube 11 and a casing 10 through the liquid nitrogen/carbon dioxide outlet 16, and finally enter a hydraulic main crack 20 through a perforation 19, and forming a freezing area 17 around the hydraulic main crack.
Step f, the liquid carbon dioxide in the carbon dioxide gas cylinder 6 enters a booster pump 5 for boosting (the injection rate of the liquid carbon dioxide is 0.2 m)3Min, injection amount of 5m3) Pumping into the concentric tube inner tube 12, allowing liquid carbon dioxide to enter the annular space between the concentric tube outer tube 11 and the concentric tube inner tube 12 through the liquid nitrogen/carbon dioxide outlet 16, entering the annular space between the concentric tube outer tube 11 and the casing 10 through the liquid nitrogen/carbon dioxide outlet 16, and finally entering the hydraulic main crack 20 through the perforation 19, so that a large number of pneumatic branch cracks 21 are formed in the freezing area 17 and the peripheral area, and further the artificial crack area 18 is formed.
The wellhead valve 4 is a conversion valve of high-viscosity fluid, liquid nitrogen and liquid carbon dioxide, and the pipeline valve 7 is a control valve between the liquid nitrogen and the liquid carbon dioxide and is used for injecting the liquid nitrogen and the liquid carbon dioxide respectively.
And step g, unsealing the casing packer 13, lifting the concentric tube outer tube 11 and the concentric tube inner tube 12, and performing next-stage fracturing.
Through the construction process, 5 hydraulic fractures are successfully induced, the injection pressure is 2.3MPa, the average thickness of the main hydraulic fracture is 1.27cm, and the distribution density of the average pneumatic branch fracture reaches 27 fractures/m2The length influence range of the artificial crack reaches 27.3m, and the width influence range reaches 14.9 m. The permeability coefficient of the soil before fracturing is 1.5 multiplied by 10-7cm/s, and the permeability coefficient of the fractured soil is 2.9 multiplied by 10-5cm/s, the permeability is increased by 190 times.
Claims (10)
1. A permeation enhancing method for shallow polluted soil comprises the following steps:
injecting high-viscosity fluid into shallow soil body, and controlling the area of shallow polluted soil to be 700m2The injection amount of the high-viscosity fluid is 5m3-10m3；
Injecting liquid nitrogen into the same liquid injection point in the shallow soil body, wherein the area of the shallow polluted soil is 700m2The injection amount of the liquid nitrogen is 2m3-5m3；
Injecting liquid carbon dioxide into the same injection point in the shallow soil body to ensure that the area of the shallow polluted soil is 700m2The injection amount of the liquid carbon dioxide is 5m3-10m3；
Repeatedly injecting high-viscosity fluid-liquid nitrogen-liquid carbon dioxide at the same injection point until crack propagation reaches the expected requirement;
the liquid carbon dioxide is replaced with nitrogen or air.
2. The method of claim 1, wherein the injection rate of the high viscosity fluid is 0.2m3/min-0.8m3/min；
The injection speed of the liquid nitrogen is 0.1m3/min-0.3m3/min；
The injection speed of the liquid carbon dioxide is 0.2m3/min-0.5m3/min。
3. The method of claim 1, wherein the injection is accomplished through concentric tubes having inner and outer tubes, the liquid nitrogen and liquid carbon dioxide are injected into the shallow soil through the inner tube of the concentric tubes, and the high viscosity fluid is injected into the shallow soil through the outer tube of the concentric tubes.
4. The permeation enhancing method according to claim 1, wherein the high viscosity fluid has a viscosity of 300-600 cp;
preferably, the high viscosity fluid is a vegetable guar or a polyacrylamide;
preferably, the high-viscosity fluid carries quartz sand or ceramsite, and the sand carrying rate is 75% -85%.
5. The cementation method according to claim 1, wherein the cementation method comprises the following steps:
completing well cementation on shallow soil;
after well cementation, perforating a shallow soil body through a casing to form an initial fluid channel between a well hole and a stratum;
setting a fracturing concentric tube in the sleeve, and sealing a fracturing section by using a packer;
high-viscosity fluid is injected through the outer pipe of the concentric pipe, a main crack is formed in a soil layer, liquid nitrogen is injected through the inner pipe of the concentric pipe, soil around the main crack is frozen, liquid carbon dioxide is injected through the inner pipe of the concentric pipe, a large number of branch cracks are formed around the hydraulic main crack, the high-viscosity fluid, the liquid nitrogen and the liquid carbon dioxide are repeatedly injected, and the permeation of shallow soil is completed.
6. The permeation enhancing method according to claim 5, wherein a casing packer is provided between an outer tube of the concentric tubes and the casing, and a concentric tube packer is provided between an inner tube of the concentric tubes and an outer tube of the concentric tubes.
7. The permeation enhancing method according to claim 6, wherein the distance between the casing packer and the perforation is 0.4m-0.6m, and the distance between the concentric pipe packer and the liquid nitrogen/liquid carbon dioxide outlet is 0.2m-0.4 m.
8. The permeation enhancing method according to claim 5, wherein an inner tube of the concentric tubes has a thermal insulating coating.
9. The cementation method of claim 5, wherein the cementing comprises the steps of:
drilling a shallow soil body to form a borehole; and (3) setting a casing in the well bore, injecting cement slurry into the casing, reversely discharging the cement slurry to fill the annular space between the casing and the well wall, and completing well cementation after the cement slurry is solidified.
10. A method for remediating shallow contaminated soil, comprising the step of carrying out the method for enhancing permeability of shallow contaminated soil according to any one of claims 1 to 9.
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| CN202011214908.4A CN112453047A (en) | 2020-11-04 | 2020-11-04 | Infiltration increasing method for shallow contaminated soil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113477687A (en) * | 2021-06-14 | 2021-10-08 | 中节能大地（杭州）环境修复有限公司 | Method for restoring low-permeability stratum contaminated soil through chemical oxidation in cooperation with hydraulic fracturing |
| CN114833193A (en) * | 2022-05-31 | 2022-08-02 | 湖南久清环保工程有限公司 | A prosthetic devices for soil pollution for environmental improvement |
| CN114888063A (en) * | 2022-06-07 | 2022-08-12 | 江苏省环境科学研究院 | In-situ remediation method for contaminated soil around buried sewage pipeline |
| CN114965956A (en) * | 2022-05-23 | 2022-08-30 | 同济大学 | Multifunctional casing for fracturing, permeability-increasing and cooperative repairing test of low-permeability polluted soil |
| CN114985436A (en) * | 2022-05-23 | 2022-09-02 | 同济大学 | Gas-liquid multi-medium pumping and injecting integrated well pipe device |
| CN115555392A (en) * | 2022-08-16 | 2023-01-03 | 江苏大地益源环境修复有限公司 | Process and device applied to low-permeability clay stratum pollutant remediation |
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Application publication date: 20210309 |
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