CN110670635A - One-hole multi-well construction method in fine particle aquifer - Google Patents
One-hole multi-well construction method in fine particle aquifer Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 239000010419 fine particle Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000005553 drilling Methods 0.000 claims abstract description 61
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 35
- 239000002002 slurry Substances 0.000 claims description 18
- 239000004927 clay Substances 0.000 claims description 15
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 238000004080 punching Methods 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 230000000474 nursing effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/027—Investigation of foundation soil in situ before construction work by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability
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Abstract
The invention discloses a one-hole multi-well construction method in a fine particle aquifer, which comprises the following steps: determining the number of well pipes according to the monitoring horizon; drilling a monitoring well to obtain a borehole; firstly, constructing a deepest well pipe, and performing pipe laying, gravel throwing and water stopping on the deepest well pipe, wherein the pipe laying comprises a settling pipe, a strainer pipe and a well wall pipe in sequence, and the top end of a gravel throwing layer is higher than the top end of the strainer pipe; secondly, constructing a middle layer well pipe in the same construction sequence as the deepest layer well pipe; and finally constructing the shallowest well pipe in the same construction sequence as the deepest well pipe. A plurality of single-well complete wells can be installed in one-hole multi-well, so that the construction cost is low, and the construction period is shortened; multiple aquifers can be monitored simultaneously; the occupied area is small, and the protection and maintenance cost is low.
Description
Technical Field
The invention relates to the technical field of well construction, in particular to a one-hole multi-well construction method in a fine particle aquifer.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The water level of underground water-bearing stratum among the prior art, quality of water monitoring well generally are a hole well monitoring well (only construct a monitoring well in a drilling promptly), and this kind of monitoring well has following drawback: the construction cost is high, the construction period is long, the number of monitoring wells in a monitoring area is reduced under the condition that the monitoring budget is not changed, the underground water monitoring network is single, and the corresponding flow direction of the underground water in the area cannot be accurately mapped; under the condition that the number of the regional monitoring wells is fixed, the monitoring wells with one well and one well occupy a large area, the number of nursing personnel is increased, the number of required maintenance places is increased, and therefore the cost is increased; moreover, the one-hole one-well monitoring well technology can only monitor the water level and the water quality of a water-bearing stratum. If a plurality of aquifers are monitored in the same place, the number of monitoring wells of different aquifers is increased. The floor space and the corresponding costs increase.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a one-hole multi-well construction method in a fine particle aquifer, wherein a plurality of monitoring well pipes are arranged in one drilling hole according to different monitoring positions, so that the aim of monitoring different aquifer sections is fulfilled, the construction cost is reduced, the construction period is shortened, the occupied area of the monitoring well is reduced, the protection and maintenance costs are reduced, and the purpose of monitoring a plurality of aquifers at the same time is realized.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a one-hole multi-well construction method in a fine particle aquifer comprises the following steps:
determining the number of well pipes according to the monitoring horizon;
drilling a monitoring well to obtain a borehole;
firstly, constructing a deepest well pipe, and performing pipe laying, gravel throwing and water stopping on the deepest well pipe, wherein the pipe laying comprises a settling pipe, a strainer pipe and a well wall pipe in sequence, and the top end of a gravel throwing layer is higher than the top end of the strainer pipe;
secondly, constructing a middle layer well pipe in the same construction sequence as the deepest layer well pipe;
and finally constructing the shallowest well pipe in the same construction sequence as the deepest well pipe.
A plurality of single wells are installed in one drilled hole, construction cost is reduced, construction period is shortened, a plurality of aquifers can be monitored by the monitoring well after construction, occupied area of the monitoring well is small, and protection and maintenance cost is low.
In some embodiments, the number of well pipes is 2-5, further 2-4, further 2-3.
In some embodiments, the drilling method is positive circulation coreless drilling, the diameter of the opening is 300-400mm, and reaming is performed after drilling to a set depth.
Further, the diameter after reaming is 600-700m, and the diameter of the hole opening is the same as that of the hole bottom.
Furthermore, in the drilling construction process, the drill collar is adopted for pressurization to control the bit pressure.
Furthermore, in order to prevent the bottom end waste residue of the drilled hole from adsorbing the drill bit, the pump is started to punch a hole before the drill bit reaches the bottom of the hole during each drilling, the bottom end waste residue is circulated out of the hole, after the water returns from the hole opening, the drilling tool is rotated at a low speed, and when no pump is disturbed, the drilling tool is lowered to the bottom of the hole to drill.
Furthermore, when the drilling tool is temporarily stopped during drilling, the drilling tool is lifted away from the bottom of the hole, and then the drilling tool is stopped and the pump is stopped.
Furthermore, in the drilling process, the hole is punched periodically to remove slag, the hole is kept clean, and slag is fished when the bottom rock powder of the hole exceeds 0.3-0.5 m.
Furthermore, the concrete method for punching and deslagging comprises the following steps: after the flushing fluid is conveyed to the bottom of the hole through the drill rod, the flushing fluid carries the waste residues at the bottom of the hole to be discharged out of the hole along the hole wall to a sedimentation tank.
Furthermore, when the unconsolidated formation is drilled, the speed of drill lifting and drilling down is kept constant, flushing liquid is filled into the hole in the process of drill lifting and after the drill lifting, and hole collapse is prevented.
In some embodiments, a centralizer is mounted on the well tubular. The method can prevent the single well pipes from being attached to each other and the single well pipes from being attached to the wall of the drilling hole, so as to avoid accurate putting of the filter material in the aquifer.
Further, the distance between adjacent centralizers is 5-15m, further 8-12m, and further 10 m.
In some embodiments, the borehole is subjected to wall breaking and slurry changing prior to casing running down the well, the slurry flooding the orifices when the wall is broken.
In some embodiments, after the well casing is run down, the wellhead is closed, and clean water is injected into the closed well to perform the punching and grout replacement. So as to ensure that the aquifer is not blocked by mud and ensure the normal water outlet of each single well.
In some embodiments, the gravel-cast filter material is quartz sand with a diameter of 2mm to 4 mm.
Furthermore, the top end of the gravel throwing layer is higher than the top end of the water filter pipe by more than 5 m.
Furthermore, the gravel throwing method is that gravel is thrown in moving water, and when the filter material is thrown, the filter material is uniformly and continuously filled along the periphery of the well wall.
In some embodiments, after gravel feeding is finished, pumping water and washing the well, and after well washing, adding clay balls to stop water in the aquifer.
Further, before the next well pipe is lowered, punching and slurry changing are carried out.
In some embodiments, after all single wells are installed, intermittent water pumping and well flushing are performed until the water is clear.
The beneficial technical effects of the invention are as follows:
a plurality of single-well complete wells can be installed in one-hole multi-well, so that the construction cost is low, and the construction period is shortened; multiple aquifers can be monitored simultaneously; the occupied area is small, and the protection and maintenance cost is low.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic plan view of a one-hole multi-well arrangement according to an embodiment of the present invention;
FIG. 2 is a schematic view of a one-hole multi-well vertical configuration in accordance with an embodiment of the present invention;
FIG. 3 is a flow diagram of a well completion process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the well pipe being lowered according to the embodiment of the present invention, (a) a single well of 400m is constructed, (b) single wells of 400m and 200m are constructed, and (c) a single well pipe of 400m, 200m and 50m is constructed;
fig. 5 is a schematic diagram of a one-hole multi-well construction according to an embodiment of the present invention, where (a) is a two-hole and (b) is a three-hole.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Examples
The construction method of one hole and multiple wells in the fine particle aquifer comprises the following steps of:
1. drilling
The monitoring well drilling method is positive circulation coreless drilling, the diameter of an opening is 350mm, the hole is reamed to 600mm or 700mm after the drilling is carried out to 200m or 400m, and the diameter of an opening is the same as the diameter of a hole bottom. The drilling construction process has the following aspects: (1) during drilling, the drill collar is adopted for pressurization, and the drill pressure meter is used for reasonably controlling the drill pressure. (2) In each drilling cycle, before the drill bit reaches the bottom of the hole, the pump is started to flush the hole, after the hole is backwashed, the drilling tool is rotated slowly, and when no pump is poor, the drilling tool is lowered to the bottom of the hole to drill; temporarily stopping the drilling machine during drilling, not lifting the drilling tool away from the bottom of the hole, and not starting the drilling machine and the pump; in the drilling process, the drilling pressure is kept uniform, and the pressure is continuously and uniformly increased and reduced; and (3) punching and deslagging periodically in the drilling process, keeping the hole clean, and fishing slag in a special process when the bottom rock powder exceeds 0.3-0.5 m. (3) Drilling in a loose stratum, shortening the punching time, keeping the speed of lifting and lowering the drill at a constant speed, and recharging flushing liquid into the hole during or after lifting the drill to prevent hole collapse. (4) In the drilling process, the situation change in the hole is noticed at any time, and measures are taken immediately when abnormal conditions appear. When the drilling is stopped, the drilling tool is lifted out of the hole or the safety hole section. (5) And after drilling is finished, the well is fully and circularly washed, the performance of the drilling fluid is adjusted, and related treating agents are supplemented, so that the smooth work of the object detection well is ensured.
2. Geophysical prospecting well logging
And carrying out geophysical logging on the stratum exposed by the drilled hole, acquiring geophysical logging information, explaining an aquifer and providing geological basis. The main parameters of geophysical logging are apparent resistivity, natural gamma, and natural potential. The main achievements obtained by geophysical prospecting logging are formation division table, natural gamma, three lateral resistivity and natural potential curve.
3. Preparation before lowering pipe
(1) According to the well pipe structure design, the quality of the well pipes is checked, the lengths and the corresponding positions of the sedimentation pipes, the water filter pipes and the well wall pipes are measured and matched according to geophysical logging information and a design monitoring layer, the length of each well pipe (the sedimentation pipes, the water filter pipes and the well wall pipes) is recorded on a journal newspaper at the same time, and a marker pen is used for numbering on the head of each well pipe, so that the pipes can be directly discharged according to the serial numbers on the heads of the well pipes during pipe discharging, and the process of measuring and matching again is avoided.
(2) As the diameter of one-hole multi-well construction drilling holes in the fine particle aquifer is larger, in order to ensure that all single wells are positioned at the drilling center at equal intervals after the construction is finished, centralizers are quantitatively installed on well pipes during pipe descending, so that the single well pipes are prevented from being attached to each other, and the single well pipes are attached to the hole walls of the drilling holes, so that the accurate throwing of filter materials in the aquifer is influenced. For this purpose, 10 m/installation centralizer preparation is required.
(3) The drilling hole is broken wall and changed thick liquid before one hole of many downhole pipes in the fine particle aquifer, and broken wall position order is from top to bottom, and during the broken wall, must keep the mud liquid full drill way, buries the broken wall drilling tool when preventing to collapse the hole. The speed of descending the wall breaking device is slow, the wall breaking position is accurately calculated, the wrong breaking position is prevented, and the expected effect cannot be achieved. After wall breaking, the slurry is diluted and a proper slurry liquid is selected. Secondly, probing the hole depth and accurately determining the drilling depth.
(4) The light consumption of the filter material and the water stopping clay is calculated in advance, and the filter material and the water stopping clay are prepared on site sufficiently according to the calculated consumption.
4. Pipe laying, gravel throwing and water stopping
And (3) one-hole multi-well pipe lowering, gravel throwing and water stopping of each single well in the fine particle aquifer are independently completed, and the construction of each single well does not influence each other in a vertical structure. The overall construction sequence, as shown in fig. 4: firstly, lowering pipes, throwing gravel and stopping water for a deep aquifer well (400 m); then, lowering the pipe of the middle-layer aquifer well (200m), throwing gravel and stopping water; and finally, performing underground pipe laying, gravel throwing and water stopping on a shallow aquifer (50 m). And connecting the well pipes of the single well by adopting a reducing connector, and performing pipe laying to form the well at one time. And sequentially descending the floating plates into the preset positions in the well by adopting a lifting floating plate method.
The lower pipe, gravel throwing and water stopping of a three-hole well in a fine particle aquifer will be described as an example.
(1) And (3) putting a 400m well pipe, wherein the pipe is sequentially a settling pipe, a strainer pipe and a well wall pipe. The centralizer was installed at 10 meters per tube during the pipe laying.
(2) After finishing dropping a single well pipe of 400m, closing the well mouth, injecting clean water into the closed well mouth by using a slurry pump, returning the clean water into a slurry pool from a gap between the wall of the well pipe and the wall of a drilled hole through a water filtering pipe so as to achieve the purpose of punching and replacing slurry, and preventing a water-bearing layer from being blocked by slurry, thereby influencing the normal water outlet of the single well.
(3) And (3) timely filling gravel after slurry exchange is finished, wherein the height of the filter material is more than 5m higher than the top end of the water filter pipe, and the filter material is quartz sand with the particle diameter of 2-4 mm. The method for feeding the filter material is to fill gravel with the moving water, and when the filter material is fed, the filter material is uniformly and continuously filled along the periphery of the well wall, and the well pipe is always kept stable; recording the quantity of the filled filter material at any time, putting a certain amount of filter material, standing for 30 minutes, measuring the filling position of the filter material, and repeating the steps until the height of the gravel is more than 5m higher than the top end of the filter pipe.
(4) And after the filter material is thrown, water pumping and well flushing are started, after water is clear, the position of the filter material is measured again, the filter material is found to sink, water stopping is started after the filter material is additionally thrown to a preset position, and the water pumping and well flushing still need to be continued.
(5) Adding clay balls to perform aquifer water stopping, standing for 2h after adding a certain amount of clay balls, and performing water stopping inspection by adopting a water level difference method. The water levels inside and outside the casing are measured and recorded. And (5) after determining that water is stopped and no fault occurs, throwing a clay ball to a position of 200 meters (the bottom end of a single well of 200 meters).
(6) As clay balls are thrown in the drill holes, mud liquid in the drill holes is thick and is not easy to drop into a single well pipe with the length of 200 meters, and slurry changing and punching are needed.
(7) And (3) putting a 200m well pipe, wherein the pipe is sequentially a settling pipe, a strainer pipe and a well wall pipe. The centralizer was installed at 10 meters per tube during the pipe laying.
(8) And (5) sealing the well mouth after the 200m single well pipe is placed, and injecting clean water into the sealed well mouth by using a mud pump to change the mud.
(9) And (3) timely filling gravel after slurry exchange is finished, wherein the height of the filter material is more than 5m higher than the top end of the water filter pipe, and the filter material is quartz sand with the particle diameter of 2-4 mm. The method for feeding the filter material comprises the steps of filling gravel with running water, placing a certain amount of filter material, standing for 30 minutes, measuring the filling position of the filter material, and repeating the steps until the height of the gravel is more than 5m higher than the top end of the filter pipe.
(10) And after the filter material is thrown, water pumping and well flushing are started, after water is clear, the position of the filter material is measured again, the filter material is found to sink, water stop is started after the filter material is additionally thrown to a preset position, and water pumping and well flushing of single wells of 400m and 200m still need to be continued.
(11) And (3) stopping water in the aquifer by adding the clay lightly, standing for 2 hours after adding the quantitative clay lightly, and then checking water stopping. And (5) after determining that water is not stopped, putting clay to a position of 50 meters (the bottom end of a single well of 50 meters).
(12) And (3) drilling 2 well pipes in the hole, replacing the slurry and punching the hole again, then putting the well pipes of 50 meters into the hole, and sequentially putting the well pipes into a settling pipe, a water filtering pipe and a well wall pipe. The centralizer was installed at 10 meters per tube during the pipe laying.
(13) And (5) sealing the well mouth after the 50m single well pipe is placed, and injecting clean water into the sealed well mouth by using a mud pump to change the mud.
(14) And (3) timely filling gravel after slurry exchange is finished, wherein the height of the filter material is more than 5m higher than the top end of the water filter pipe, and the filter material is quartz sand with the particle diameter of 2-4 mm. The method for feeding the filter material comprises the steps of filling gravel with running water, placing a certain amount of filter material, standing for 30 minutes, measuring the filling position of the filter material, and repeating the steps until the height of the gravel is more than 5m higher than the top end of the filter pipe.
(15) And after the filter material is fed, water pumping and well flushing are started, after water is clear, the position of the filter material is measured again, when sinking is found, water stop is started after the filter material is fed to a preset position, and water pumping and well flushing of single wells of 400m, 200m and 50m still need to be continued.
(16) And (3) adding clay to carry out aquifer water stopping, standing for 2 hours after adding quantitative clay to expand the clay, and then carrying out water stopping inspection. And (5) after determining that water is stopped and no fault occurs, throwing clay to the ground. The 3 well pipes are in a shape like a Chinese character 'pin' on the plane.
(17) And (5) alternately pumping water to wash the wells intermittently until the water is cleaned.
(18) Manufacturing a wellhead protection device, installing a warning board and installing monitoring equipment.
The arrangement of the single wells in the constructed monitoring well is shown in fig. 1(b) and 5(b), and the structure in the monitoring well is shown in fig. 2.
Similarly, when the number of the single wells in the monitoring well is two, the single wells are arranged as shown in fig. 1(a) and 5(a), and the construction method is the same as that when the number of the single wells is 3.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A one-hole multi-well construction method in a fine particle aquifer is characterized in that: the method comprises the following steps:
determining the number of well pipes according to the monitoring horizon;
drilling a monitoring well to obtain a borehole;
firstly, constructing a deepest well pipe, and performing pipe laying, gravel throwing and water stopping on the deepest well pipe, wherein the pipe laying comprises a settling pipe, a strainer pipe and a well wall pipe in sequence, and the top end of a gravel throwing layer is higher than the top end of the strainer pipe;
secondly, constructing a middle layer well pipe in the same construction sequence as the deepest layer well pipe;
and finally constructing the shallowest well pipe in the same construction sequence as the deepest well pipe.
2. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: the number of the well pipes is 2-5, further 2-4, further 2-3.
3. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: the drilling method comprises the steps of positive circulation coreless drilling, wherein the diameter of an opening is 300-400mm, and reaming is carried out after drilling to a set depth;
further, the diameter after reaming is 600-700m, and the diameter of the hole opening is the same as that of the hole bottom;
furthermore, in the drilling construction process, a drill collar is adopted for pressurization to control the bit pressure;
furthermore, in order to prevent the bottom end waste residue of the drilled hole from adsorbing the drill bit, the pump is started to punch a hole before the drill bit reaches the bottom of the hole during each drilling, the bottom end waste residue is circulated out of the hole, after the water returns from the hole opening, the drilling tool is rotated at a low speed, and when no vehicle and pump are disturbed, the drilling tool is lowered to the bottom of the hole to be drilled;
further, when the drilling tool is temporarily stopped during drilling, the drilling tool is lifted away from the bottom of the hole, and then the drilling tool is stopped and the pump is stopped;
furthermore, in the drilling process, regularly punching and deslagging are carried out, the hole is kept clean, and slag is fished when the bottom rock powder of the hole exceeds 0.3-0.5 m;
furthermore, the concrete method for punching and deslagging comprises the following steps: after the flushing fluid is conveyed to the bottom of the hole through the drill rod, the flushing fluid carries the waste residues at the bottom of the hole to be discharged out of the hole along the hole wall to a sedimentation tank;
furthermore, when drilling in a unconsolidated formation, the speed of drill lifting and drilling down is kept at a constant speed, and flushing fluid is poured into homogeneous phase holes during and after the drill lifting, so that hole collapse is prevented;
4. the method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: a centralizer is mounted on the well pipe.
5. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: the distance between adjacent centralizers is 5-15m, further 8-12m, and further 10 m.
6. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: before the well pipe is lowered, wall breaking and slurry changing are carried out on the drill hole, and when the wall breaking is carried out, slurry liquid fills the hole opening.
7. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: and after the well pipe is lowered, the well mouth is closed, clean water is injected into the closed well, and punching and slurry changing are carried out.
8. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: the filtering material for throwing the gravel is quartz sand with the diameter of 2mm-4 mm;
furthermore, the top end of the gravel throwing layer is higher than the top end of the water filter pipe by more than 5 m;
furthermore, the gravel throwing method is that gravel is thrown in moving water, and when the filter material is thrown, the filter material is uniformly and continuously filled along the periphery of the well wall.
9. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: after gravel feeding is finished, pumping water and washing the well, and after well washing, feeding clay balls to stop water in the aquifer;
further, before the next well pipe is lowered, punching and slurry changing are carried out.
10. The method of one-hole multi-well construction in a fine particle aquifer according to claim 1, wherein: and after all the single wells are installed, intermittently pumping water and washing the wells until the water is clear.
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| CN111411901A (en) * | 2020-04-28 | 2020-07-14 | 北京市地质工程勘察院 | Small-caliber shallow groundwater nested monitoring well and well completion method thereof |
| CN111425186A (en) * | 2020-04-28 | 2020-07-17 | 北京市地质工程勘察院 | Shallow underground water small-caliber cluster type monitoring well and well completion method thereof |
| CN111594104A (en) * | 2020-06-24 | 2020-08-28 | 中国地质调查局水文地质环境地质调查中心 | Method for filtering and descending turbidity in narrow space in well |
| CN111910710A (en) * | 2020-08-12 | 2020-11-10 | 中建一局集团第三建筑有限公司 | Shallow underground water combined well structure and well forming construction method thereof |
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| CN112665899A (en) * | 2020-11-23 | 2021-04-16 | 天津市地球物理勘探中心 | Sampling method suitable for loose sand, clay layer soil sample and pore water |
| CN114837550A (en) * | 2022-05-19 | 2022-08-02 | 中煤矿业集团有限公司 | Fine silt clay layer drilling method |
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