CN117145007A - Full-injection half-extraction type fresh water underground storage and production well based on air bags - Google Patents
Full-injection half-extraction type fresh water underground storage and production well based on air bags Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 89
- 239000013505 freshwater Substances 0.000 title claims abstract description 68
- 238000002347 injection Methods 0.000 title claims abstract description 33
- 239000007924 injection Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000605 extraction Methods 0.000 title abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 111
- 238000011065 in-situ storage Methods 0.000 claims abstract description 36
- 238000005086 pumping Methods 0.000 claims abstract description 24
- 210000004712 air sac Anatomy 0.000 claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 5
- 239000003673 groundwater Substances 0.000 claims description 38
- 230000035699 permeability Effects 0.000 claims description 18
- 238000004088 simulation Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/10—Obtaining and confining water by means of wells by means of pit wells
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Abstract
The invention discloses a full-injection and half-pumping type fresh water underground storage and production well based on an air sac, which comprises a well hole drilled on a water-proof bottom plate of a confined aquifer, a pumping and water-injection dual-purpose pump arranged in the well hole, the air sac embedded in the lower part of the dual-purpose pump, the water-proof bottom plate, a water-proof top plate and a water storage area formed by surrounding the water-proof bottom plate and the water-proof top plate, a natural soil layer positioned on the upper part of the water-proof top plate, and a packer arranged on the top of the well hole and corresponding to the water-proof top plate. The air bag is exhausted and opened in the injection stage, so that the water injection efficiency is maximized; and in the extraction stage, the air bags are inflated and closed, the water inlet and outlet section of the well hole is limited at the shallow part of the water storage area, fresh water at the shallow part is collected more, and the time node for collecting in-situ underground salt water is delayed. The design is helpful for weakening or counteracting the negative influence of density difference between injected water and in-situ underground water on the underground storage and extraction of fresh water, so that the storage and extraction effect of the fresh water in an underground aquifer is improved, and meanwhile, the construction cost is low, the maintenance is easy, and the air bags can be reused.
Description
Technical Field
The invention relates to a full-injection and half-extraction type fresh water underground storage and production well based on an air bag, and belongs to the technical field of underground water resource regulation.
Background
In recent years, the problem of global water resource shortage is becoming more serious, and challenges are brought to the development of human beings and the progress of society. Especially in coastal and arid-semiarid regions, the supply and demand relationship of fresh water resources is extremely tight, and a series of natural disasters such as groundwater level drop, ground subsidence, seawater invasion and the like are caused by long-term underground water super-mining.
In order to solve the problems, the fresh water underground storage and extraction technology realizes the annual withered regulation and annual long-acting regulation of water resources by periodically injecting fresh water into and extracting fresh water from an underground aquifer, thereby improving the water resource utilization efficiency and the national water safety guarantee capability. In addition, the technology can supplement the reserve of groundwater, and is helpful for raising groundwater level, delaying ground subsidence and preventing seawater invasion. Compared with the traditional surface water resource regulation and storage technology (such as a surface water reservoir, a reservoir and the like), the fresh water underground storage and mining technology has the advantages of low construction cost, no occupation of land, small evaporation loss, large water resource regulation and storage capacity, small risk of water pollution caused by human activities, capability of improving various ecological problems caused by underground water super mining and the like.
The technology generally adopts a single pumping and water filling dual-purpose well to store and collect fresh water, has a simple structure, and generally enters and exits water on a vertical full section of a water storage area. Although such wells are convenient to construct and install, they are often subject to density effects (due to density differences between in-situ groundwater and injected freshwater) in coastal and arid-semiarid regions, which in turn cause the injected freshwater to float up to the shallow layer of the water storage area where in-situ groundwater salt water accumulates in the deep layer of the water storage area near the well. When the injected fresh water is recovered, full-section water inflow can lead salt water to enter from the deep part of the well prematurely, so that the quality of the recovery water is polluted, and the final storage and recovery effect is greatly affected. Partial engineering designers try to set a water injection well with full-section water outlet and a pumping well with shallow section water inlet respectively, so that the influence of the density effect is reduced, but meanwhile, the construction and maintenance cost of the fresh water underground storage and production engineering is increased sharply, and the practical application benefit is low.
In order to solve the problems existing in the above underground water resource regulation technology, a new fresh water underground storage and production well structure needs to be designed by the skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a full-injection and half-extraction type fresh water underground storage and production well based on an air bag.
In order to solve the technical problems, the invention adopts the following technical scheme: a full-injection and half-extraction type fresh water underground storage and production well based on an air sac comprises a well hole drilled to a confined aquifer water-proof bottom plate, and a water storage area is arranged around the well hole.
The water-resistant soleplate is composed of natural sediment with low permeability.
A packer is arranged at the top of the well bore, and a pump for pumping and injecting water is arranged in the well bore through the packer.
The air sac is arranged below the water pumping and injecting dual-purpose pump, when the water pumping and injecting dual-purpose pump injects water into the well hole, the air sac is closed, and when the water pumping and injecting dual-purpose pump pumps water from the well hole, the air sac is opened and cuts off water in the well hole.
Preferably, the air bag is buried in a certain depth, and the ratio of the distance from the air bag to the bottom of the packer to the thickness of the water storage area is eta. The calculation formula of the ratio eta is as follows:
wherein B is the thickness of the water storage area, and L is the embedding depth of the air bag.
Preferably, the value of η is optimized and determined by numerical simulation pre-experiments based on the hydrogeological conditions of the water storage zone.
Preferably, the η value ranges are as follows:
wherein K is the permeability coefficient of the water storage area, and delta is the relative density difference between the injected fresh water and the in-situ groundwater.
Preferably, the η best values are shown in the following table:
| Kδ(m/d) | optimal value of eta |
| 0.005 | 0.85 |
| 0.01 | 0.8 |
| 0.02 | 0.65 |
| 0.04 | <0.25 |
| 0.08 | 0.05 |
Wherein K is the permeability coefficient of the water storage area, and delta is the relative density difference between the injected fresh water and the in-situ groundwater.
Preferably, the open section of the well bore is as long as the reservoir thickness of the confined aquifer.
Preferably, the diameter of the balloon in the closed state is less than or equal to one third of the diameter of the borehole.
As a preferable scheme, the air bag realizes the control of the opening and closing state through nitrogen pumping.
Preferably, the diameter of the well is not less than 50cm.
Preferably, a water-resistant roof consisting of low permeability natural sediments is present around the top of the well bore, and a natural soil layer is present above the water-resistant roof.
The beneficial effects are that:
the working principle of the invention is as follows: the air bags are inflated and closed at the extraction stage, the water inlet section of the well hole is limited at the shallow part of the water storage area, and fresh water at the shallow part is collected more, so that extraction of deep salt water is avoided as much as possible, the time node that salt water invades the well hole to cause the salt concentration of recovery water to rise to the maximum allowable concentration is delayed, and finally the underground storage and extraction effect of the fresh water is improved.
Due to the adoption of the technical scheme, the invention has the following beneficial effects compared with the prior art: by arranging the air bags in a single well hole, the method realizes that fresh water is preferentially recovered from the shallow part of the aquifer in the extraction stage, and the negative influence caused by density difference is offset as much as possible, so that the underground storage and recovery effect of the fresh water is obviously improved; on the other hand, the injection phase opens the bladder by venting, allowing well flow to occur over the full surface of the wellbore, maximizing injection efficiency. In addition, the invention has simple structure, low construction cost compared with the method of drilling a plurality of different mining horizon wellbores respectively, and the embedded air bags can be used for adjusting the embedding depth or reutilizing other wellbores at any time.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 is a schematic diagram of a reservoir well structure in a fresh water injection stage according to the present invention.
FIG. 2 is a schematic diagram of a storage well structure in the fresh water extraction stage of the present invention.
FIG. 3 is a conceptual model diagram of a numerical simulation of an embodiment of the present invention.
FIG. 4 is a graph showing recovery rate versus depth of airbag embedment for different reservoir permeability, relative density differences, and longitudinal dispersion cases.
Wherein: 1. a wellbore; 2. a water-resistant bottom plate; 3. pumping and water injection dual-purpose pump; 4. an air bag; 5. a nitrogen pumping pipeline; 6. a water storage area; 7. a water-resistant top plate; 8. a natural soil layer; 9. a packer; 10. the direction of the groundwater flow.
Detailed Description
In order to more clearly understand the above objects, features and advantages of the present invention, a full injection and half pump type fresh water underground storage and production well based on an air bag according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 4.
The invention provides a full-injection and half-pumping type fresh water underground storage and production well based on an air sac, which comprises a well hole 1 drilled to a confined aquifer, wherein a waterproof bottom plate 2 formed by low-permeability natural sediments is arranged at the bottom of the well hole 1, an air sac 4 is arranged in the well hole 1 below the air sac 1 and the water pumping and injecting dual-purpose pump 3, the air sac 4 is connected with a nitrogen pumping and draining pipeline 5, a water storage area 6 is arranged around the well hole 1, the water storage area 6 is formed by high-permeability sandy natural sediments, a waterproof top plate 7 formed by low-permeability natural sediments is arranged at the top of the water storage area 6, a natural soil layer 8 is arranged at the upper part of the waterproof top plate 7, and a packer 9 is arranged at the well hole 1 corresponding to the waterproof top plate 7.
The diameter of the borehole 1 to be drilled should not be too small, at least up to 50cm.
The balloon 4 is placed in the borehole to a depth and a vertical distance L from the bottom of the packer 9. As shown in fig. 1, the bladder remains closed (uninflated) during the injection phase, as shown in fig. 2, and remains open (fully inflated) during the withdrawal phase, the bladder diameter should not exceed one third of the well bore diameter in the closed state, and the bladder blocks water in the well bore in the open state.
The top of the wellbore 1 is sealed by a packer 9, the bottom of the packer 9 being positioned to coincide with the bottom of the roof 7 to form an open section of the wellbore corresponding to the thickness B of the water storage zone 6.
A pump 3 for pumping and injecting water is arranged in the well hole 1, fresh water is injected into a water storage area 7 of an aquifer in a water-rich period, and meanwhile, the air bags are controlled to be closed, so that water is discharged from the whole section of the well hole to improve the injection efficiency. When the fresh water demand in the dead water period is large, the fresh water in the water storage area 7 is pumped back for use, at the moment, the air bags are opened, the water inlet surface of the well hole is limited to be only corresponding to the shallow part of the water storage area, the fresh water is preferentially pumped from the shallow part, and the situation that the fresh water is pumped back to the in-situ underground salt water prematurely is avoided. Arrow 10 illustrates the distribution of the groundwater flow corresponding to the two phases described above.
The embedded depth of the air bag is optimally designed according to the hydrogeological condition of the water storage area, and in order to facilitate the description and quantification of the relation between the embedded depth of the air bag and the storage and production effect, the embedded depth of the air bag is defined by adopting the dimensionless depth ratio eta:
where B is the thickness of the reservoir and L is the depth of penetration of the bladder (distance from the packer). η ranges from 0 to 1; the value of η is closer to 1, indicating that the bladder is embedded deeper (closer to the water-barrier floor), i.e. closer to the case where no bladder is employed.
Example 1
The diameter of the well bore 1 was 60cm and the balloon diameter in the closed state was 20cm. The thickness B of the water storage area of the confined aquifer is 50m, and the same is true of the open section of the well hole, which is 50m. Porosity of the water storage area is 0.3, water storage coefficient is 1 multiplied by 10 -4 M, the ratio of transverse to longitudinal dispersion is 0.1m, and the molecular diffusion coefficient is 1×10 -9 m 2 The values reported in the relevant literature are used for parameters such as/s.
Based on the conceptual model shown in fig. 3, the embodiment is numerically simulated by using saturated variable density underground water flow and solute transport open source simulation software SEAWAT-2000, so that the effect of fresh water underground storage and recovery is compared and explained, and meanwhile, the optimal air bag embedding depth ratio is determined.
Simulation of one "fill-rest-draw" complete cycle with a time span of one year (365 days) was performed, including 100 days of fresh water fill, 16Standing for 5 days, and extracting for 100 days. The total flow of water pumping and water injection is fixed to be 500m 3 /d (cubic meters per day). In numerical simulation, the concentration of fresh water was 0 and the density was 1000kg/m 3 。
The invention adopts the recovery Rate (RE) to evaluate the storage and recovery effect of fresh water. RE is defined as:
wherein V is inj Is the volume of injected water, V rec Is the volume of the extracted water meeting the water quality standard (the salt concentration does not exceed the maximum limit of TDS, and the limit is set to be 0.5g/L in the embodiment). The larger the RE value is, the better the fresh water storage and recovery effect is.
In order to conveniently quantify and compare the action degree of the full injection half pumping type fresh water underground storage and production well for improving the fresh water storage and production effect, the invention further adopts the recovery rate improvement degree (delta RE) to evaluate the effect of the invention. ΔRE is defined as:
ΔRE＝RE-RE 0 (2)
in the RE 0 The recovery rate under the condition that the invention is not applied is that RE is based on the air bag to realize the recovery rate under the condition of full injection and half drawing. The larger the delta RE is, the more obvious the effect of the full injection and half pumping type fresh water underground storage and production well on the recovery rate is.
In the simulation process, the permeability coefficient K=1m/d of the confined aquifer water storage area is respectively set, the relative density difference delta between the injected fresh water and the in-situ groundwater is=0.5 percent (namely, the density of the in-situ groundwater is 1005 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4.
Example 2
Except that the permeability coefficient K=2m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta between the injected fresh water and the in-situ groundwater is=0.5 percent (namely, the density of the in-situ groundwater is 1005 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The conditions were the same as in example 1 except that the longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-barrier ceiling), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-barrier floor) respectively, and the recovery rate improvement Δre was as shown in fig. 4 "under the different combination conditions.
Example 3
Except that the permeability coefficient K=4m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta between the injected fresh water and the in-situ groundwater is=0.5% (namely, the density of the in-situ groundwater is 1005 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 4
Except that the permeability coefficient K=1m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=1 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1010 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 5
Except that the permeability coefficient K=2m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=1 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1010 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 6
Except that the permeability coefficient K=4m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=1 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1010 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 7
Except that the permeability coefficient K=1m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=2 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1020 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 8
Except that the permeability coefficient K=2m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=2 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1020 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal dispersion of the aquifer medium in the water storage area was 0.1m, 0.5m, 1m, respectively, and η was 0.05 (bladder approaching the water-proof top plate), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-proof bottom plate), respectively, and the recovery rate improvement Δre under different combinations of conditions was shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
Example 9
Except that the permeability coefficient K=4m/d of the confined aquifer water storage area is respectively set in the simulation process, the relative density difference delta=2 between the injected fresh water and the in-situ groundwater (namely, the density of the in-situ groundwater is 1020 kg/m) 3 The corresponding in-situ groundwater concentration is) The method comprises the steps of carrying out a first treatment on the surface of the Water storage areaThe recovery improvement Δre for different combinations of 0.1m, 0.5m, 1m for the aqueous layer medium, and 0.05 (bladder approaching the water-barrier roof), 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 (bladder approaching the water-barrier floor) for η, respectively, is shown in fig. 4. Except for "the above, the conditions were the same as in example 1.
As shown in FIG. 4, after the full injection and half pumping type fresh water underground storage and production well is adopted, the osmotic coefficient K, the relative density delta and the longitudinal dispersion alpha are different L Under the combined conditions of (a) and (b), the recovery rate improvement degree deltare is greater than zero, and in 9 embodiments, the recovery rate RE can be improved by at least 4% and at most 52%. Although the numerical model is highly generalized, the results prove that the full-injection and half-extraction type fresh water underground storage and production well provided by the invention can effectively improve the underground fresh water storage and production effect.
As can be seen from fig. 4, the preferred range of values for η is primarily affected by the product of the permeability coefficient K and the relative density difference δ. Most of the Δre values lie in the interval >0 (gray part in each subgraph), except for the case where both K and δ are very small kδ=0.005 m/d (meters/day). When kδ=0.01 m/d, the depth of penetration of the balloon should be tightly controlled in the lower half of the wellbore (η > 0.5). When Kdelta is more than or equal to 0.02m/d, RE can be improved when the air bag is embedded at any depth. However, kδ=0.02 m/d is not too shallow, and η should be optimally chosen to be about 0.65, i.e. the well is shifted down. When kδ=0.04 m/d, the balloon should be buried as shallow as possible (η < 0.25). When kδ=0.08 m/d, the lifting effect of the fully-injected and semi-pumped fresh water underground storage and production well on RE is limited, but a certain improvement effect is still exerted along with the reduction of η, and when η=0.05, Δre can reach 34%, so that the airbag is buried in a shallow place to the greatest extent possible.
Recovery rate improvement degree statistical table under different hydrogeological parameter combination conditions
The above-mentioned knotThe invention is further described in a very broad application. In practical application, the specific embedding depth of the air bag can be optimized and adjusted by carrying out numerical simulation pre-test based on the site hydrogeological conditions and parameters, so that effective RE improvement is realized. In addition, it can be seen from FIG. 4 that the longitudinal dispersion α is lower without changing other hydrogeologic parameters L Corresponding to a higher Δre, the invention is therefore particularly suitable for cases where the aquifer heterogeneity is weak.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The utility model provides a full annotate half take out formula fresh water underground storage and production well based on gasbag which characterized in that: comprises a well hole drilled on a confined aquifer water-proof bottom plate, and a water storage area is arranged around the well hole;
the waterproof bottom plate is composed of low-permeability natural sediments;
a packer is arranged at the top of the well hole, and a pump for pumping and injecting water passes through the packer and is arranged in the well hole;
the air sac is arranged below the water pumping and injecting dual-purpose pump, when the water pumping and injecting dual-purpose pump injects water into the well hole, the air sac is closed, and when the water pumping and injecting dual-purpose pump pumps water from the well hole, the air sac is opened and cuts off water in the well hole.
2. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the air bag is buried in a certain depth, and the ratio of the distance from the air bag to the bottom of the packer to the thickness of the water storage area is eta; the calculation formula of the ratio eta is as follows:
wherein B is the thickness of the water storage area, and L is the embedding depth of the air bag.
3. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the value of eta is optimized and determined according to the hydrogeological condition of the water storage area through a numerical simulation pre-test.
4. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the eta value range is shown in the following table:
wherein K is the permeability coefficient of the water storage area, and delta is the relative density difference between the injected fresh water and the in-situ groundwater.
5. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the optimal eta values are shown in the following table:
Wherein K is the permeability coefficient of the water storage area, and delta is the relative density difference between the injected fresh water and the in-situ groundwater.
6. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the open section length of the well bore is the same as the reservoir thickness of the confined aquifer.
7. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the balloon has a diameter in the closed position of less than or equal to one third of the diameter of the wellbore.
8. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the air bag realizes the control of the opening and closing state through nitrogen pumping.
9. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: the diameter of the well bore is not less than 50cm.
10. The airbag-based full injection and half pump type fresh water underground storage and production well is characterized in that: a water-resistant roof consisting of low permeability natural sediments is present around the top of the well bore, and a natural soil layer is present above the water-resistant roof.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311047822.0A CN117145007A (en) | 2023-08-18 | 2023-08-18 | Full-injection half-extraction type fresh water underground storage and production well based on air bags |
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| CN202311047822.0A CN117145007A (en) | 2023-08-18 | 2023-08-18 | Full-injection half-extraction type fresh water underground storage and production well based on air bags |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117803043A (en) * | 2024-02-29 | 2024-04-02 | 山东省水利科学研究院 | Synchronous exploitation and recharging device and method for salty and fresh water in same well |
| CN117803044A (en) * | 2024-02-29 | 2024-04-02 | 山东省水利科学研究院 | Combined well salty and fresh water synchronous exploitation recharging device and method thereof |
-
2023
- 2023-08-18 CN CN202311047822.0A patent/CN117145007A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117803043A (en) * | 2024-02-29 | 2024-04-02 | 山东省水利科学研究院 | Synchronous exploitation and recharging device and method for salty and fresh water in same well |
| CN117803044A (en) * | 2024-02-29 | 2024-04-02 | 山东省水利科学研究院 | Combined well salty and fresh water synchronous exploitation recharging device and method thereof |
| CN117803044B (en) * | 2024-02-29 | 2024-05-31 | 山东省水利科学研究院 | Combined well salty and fresh water synchronous exploitation recharging device and method thereof |
| CN117803043B (en) * | 2024-02-29 | 2024-05-31 | 山东省水利科学研究院 | Synchronous exploitation and recharging device and method for salty and fresh water in same well |
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