CN110671053B - Well construction method for underground water layered sampling monitoring well - Google Patents

Well construction method for underground water layered sampling monitoring well Download PDF

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Publication number
CN110671053B
CN110671053B CN201910931296.1A CN201910931296A CN110671053B CN 110671053 B CN110671053 B CN 110671053B CN 201910931296 A CN201910931296 A CN 201910931296A CN 110671053 B CN110671053 B CN 110671053B
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aquifer
well
sampling
water
pipe
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CN110671053A (en
Inventor
苗竹
刘泽权
黄硕
吕正勇
朱湖地
任贝
刘登山
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Beijing Geoenviron Engineering and Technology Inc
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Beijing Geoenviron Engineering and Technology Inc
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/20Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells

Abstract

The invention discloses a well construction method of an underground water layered sampling monitoring well, which comprises the following steps: the method comprises the following steps of determining the hydrogeological conditions of a site, drilling and constructing a first aquifer, putting a pipe in the first aquifer, stopping water, forming a well in the first aquifer sampling section, washing the well in the first aquifer sampling section, drilling and constructing a second aquifer, putting a pipe in the second aquifer sampling section, forming a well, washing the well for the second time, constructing a well platform and the like. The invention can complete the construction of the monitoring well by one-time construction, and realizes the layered sampling of the groundwater of 2 aquifers below the ground in one monitoring well by carrying out special structural design on the monitoring well. The sleeve is arranged to separate groundwater of 2 aquifers below the ground, multiple water stopping measures such as concrete pouring, yellow soil throwing and the like are adopted, the complete isolation and water stopping of the 2 aquifers are completed, and the accuracy of layered sampling is guaranteed; meanwhile, the method has the advantages of simple construction process, strong practicability and strong operability, and meets the long-term monitoring requirement of underground water layered sampling.

Description

Well construction method for underground water layered sampling monitoring well
Technical Field
The invention relates to the technical field of investigation of underground water environment of a polluted site, in particular to a well construction method of an underground water layered sampling monitoring well.
Background
The underground water layered sampling is of great importance in the investigation of the underground water environment of the polluted site, and the underground water of different aquifers in the site is sampled and monitored in a layered mode to find out the vertical spatial distribution of pollutants in the underground water, so that the pollution position and the pollution depth of the underground water are determined. The foundation is provided for the groundwater remediation in the later period, and the phenomena that the remediation cost is increased and the remediation effect is poor due to neglect of the groundwater pollution depth and blind remediation of the polluted layer are avoided.
The migration of pollutant in groundwater is mainly horizontal direction, and complete relative water barrier restricts the pollutant and strides aquifer migration along the vertical, and the vertical aquifer migration of striding of pollutant in groundwater is mainly through relative water barrier skylight under natural state. Vertical migration of contaminants across aquifers is primarily an artifact and is generally shallow in depth. Therefore, the number of the aquifers generally polluting the ground water of the pollution site is not more than 2.
The traditional method of surveying and sampling in layers aiming at groundwater environment pollution in a pollution site survey project is mainly sleeve water stopping, 2 aquifers are sampled in two steps, namely, the aquifer groundwater in the upper layer is sampled by controlling the depth of a sampling well, the aquifer groundwater in the lower layer is sampled by mainly drilling the sleeve along with the pipe to finish the water stopping of the aquifer in the upper layer, and then the aquifer in the lower layer is drilled to form a well to finish the sampling of the aquifer in the lower layer. The traditional sampling method aims at the problems that two sampling wells need to be constructed at one underground water monitoring point position to finish layered sampling, and water stopping is not complete due to casing pipe following drilling.
Besides the traditional casing water stop method, various novel groundwater layered water stop sampling methods also exist in the field of groundwater environment monitoring, for example, a flange plate is welded on a water-containing layer of a monitoring well pipe, and a water stop measure is assisted to complete groundwater layered sampling. The methods are relatively inapplicable in the field of investigation of polluted site groundwater environment, and have weak practicability and relatively complex operability.
Disclosure of Invention
Aiming at the defects in the problems, the invention provides a well construction method of a subsurface water stratified sampling monitoring well.
The invention discloses a well construction method of an underground water layered sampling monitoring well, which comprises the following steps:
step 1, determining the hydrogeological conditions of a site: finding out a stratum structure of a monitoring point position, wherein the stratum structure sequentially comprises the following steps from top to bottom: an aeration zone, a first aquifer, a first relative water barrier, a second aquifer and a second relative water barrier;
step 2, drilling construction of a first aquifer: drilling a hole into a first relative water barrier below a first aquifer with a drilling tool to form a first borehole;
step 3, first aquifer lower pipe: sequentially putting a large-diameter hard pipe and a sleeve into the first drilling hole from outside to inside, and sieving the large-diameter hard pipe at a position corresponding to the first aquifer to form a strainer so that water in the first aquifer enters a gap between the large-diameter hard pipe and the sleeve to serve as a first aquifer sampling section;
step 4, first water stopping: filling a water stop section in a gap between the large-diameter hard pipe and the casing pipe in the first relative water-resisting layer;
and 5, drilling construction of a second aquifer: drilling continuously into a second relative water-resisting layer below a second aquifer at the bottom of the first drill hole in the casing by using the drilling tool to form a second drill hole;
step 6, lowering the pipe in the second aquifer: and a small-diameter hard pipe is arranged in the sleeve and the second drilling hole, and a sieve is arranged at the position of the small-diameter hard pipe corresponding to the second aquifer to form a water filtering pipe, so that the water of the second aquifer enters the small-diameter hard pipe to be used as a second aquifer sampling section.
As a further improvement of the present invention, in the step 4, the water stopping section includes a concrete section and a yellow mud section arranged from bottom to top.
As a further improvement of the present invention, between the step 4 and the step 5, the method further comprises:
step 7, forming a well by a first aquifer sampling section: in a gap between the large-diameter hard pipe and the wall of the first drilled hole, a concrete section and a yellow mud section are arranged at the position of the first relative water-resisting layer from bottom to top, a quartz sand filter material section is arranged at the position of the first water-bearing layer, and a yellow mud section and a concrete section are arranged at the position of the aeration zone from bottom to top.
As a further improvement of the present invention, between the step 7 and the step 5, the method further comprises:
and 8, washing the well in the first aquifer sampling section.
As a further improvement of the present invention, after the step 6, the method further comprises:
step 9, forming a well by a second aquifer sampling section: in a gap between the small-diameter hard pipe and the wall of a second drilling hole, a yellow mud section is arranged at the position of a second relative water-resisting layer, a quartz sand filter material section is arranged at the position of a second water-containing layer, and a yellow mud section is arranged at the position of a first relative water-resisting layer; and a yellow mud section and a concrete section are arranged in a gap between the small-diameter hard pipe and the sleeve from bottom to top.
As a further improvement of the present invention, after the step 9, the method further comprises:
and 10, washing the well in a second aquifer sampling section.
As a further improvement of the invention, the upper ends of the large-diameter hard tube, the sleeve and the small-diameter hard tube all extend out of the ground, and the heights of the upper surfaces are consistent.
As a further improvement of the invention, a well cap is arranged on the large-diameter hard pipe, the casing pipe and the small-diameter hard pipe, and a well platform is arranged on the ground outside the well cap.
Compared with the prior art, the invention has the beneficial effects that:
the invention can complete the construction of the monitoring well by one-time construction, and realizes the layered sampling of the groundwater of 2 aquifers below the ground in one monitoring well by carrying out special structural design on the monitoring well. The sleeve is arranged to separate groundwater of 2 aquifers below the ground, multiple water stopping measures such as concrete pouring, yellow soil throwing and the like are adopted, the complete isolation and water stopping of the 2 aquifers are completed, and the accuracy of layered sampling is guaranteed; meanwhile, the method has the advantages of simple construction process, strong practicability and strong operability, and meets the long-term monitoring requirement of underground water layered sampling.
Drawings
FIG. 1 is a schematic structural diagram of an underground water stratification sampling monitoring well for implementing a well construction method according to an embodiment of the present invention;
FIG. 2 is a horizontal cross-sectional view of the sampling monitor well a-a' of FIG. 1;
FIG. 3 is a horizontal cross-sectional view of the sampling monitor well b-b' of FIG. 1;
FIG. 4 is a horizontal cross-sectional view of the sampling monitor well c-c' of FIG. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention discloses a well construction method of an underground water layered sampling monitoring well, which comprises the following steps: the method comprises the following steps of determining the hydrogeological conditions of a site, drilling and constructing a first aquifer, putting a pipe in the first aquifer, stopping water, forming a well in the first aquifer sampling section, washing the well in the first aquifer sampling section, drilling and constructing a second aquifer, putting a pipe in the second aquifer sampling section, forming a well, washing the well for the second time, constructing a well platform and the like. The invention can complete the construction of the monitoring well by one-time construction, and realizes the layered sampling of the groundwater of 2 aquifers below the ground in one monitoring well by carrying out special structural design on the monitoring well. The sleeve is arranged to separate groundwater of 2 aquifers below the ground, multiple water stopping measures such as concrete pouring, yellow soil throwing and the like are adopted, the complete isolation and water stopping of the 2 aquifers are completed, and the accuracy of layered sampling is guaranteed; meanwhile, the method has the advantages of simple construction process, strong practicability and strong operability, and meets the long-term monitoring requirement of underground water layered sampling.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in figures 1-4, the invention provides a well construction method of a groundwater stratified sampling monitoring well, the sampling monitoring well formed by the well construction method comprises an aeration belt, a first water-bearing layer, a first relative water-bearing layer, a second relative water-bearing layer, concrete, yellow earth, quartz sand filter material, a first water-bearing layer sampling section (c), a second water-bearing layer sampling section (c),small diameter hard tube (DN80 hard PVC tube 1), sleeve (Stainless steel sleeve 2), major diameter hard pipe (DN450 stereoplasm PVC pipe 3), drilling pore wall 4, wherein, drilling pore wall 4 includes first drilling pore wall and second drilling pore wall.
According to the design of the monitoring well and the construction content of the monitoring well, the following materials are prepared:
1) well pipe: well casing materials are prepared according to the structural design of a monitoring well shown in the attached figure 1, water filter pipes are arranged on corresponding sections of DN450 rigid PVC pipes and DN80 rigid PVC pipes by screening according to design requirements, the positions of the water filter pipes are wrapped with meshes and fixed by iron wires, and all the stainless steel casing pipes are solid pipes. All well pipes should be made of a strong, corrosion resistant, non-polluting material for groundwater quality.
2) Quartz sand: pure quartz sand with the grain size of 40 meshes or 60 meshes is selected.
3) Yellow soil: pure yellow soil is selected, and the permeability coefficient is less than or equal to 10-7 cm/s.
4) Concrete raw materials and additives: the concrete raw material needs to be pure, and the coarse aggregate grading is controlled to be 5-10 mm. The additive mainly comprises an early strength agent, an air-entraining additive (anti-permeability) and the like. The finally mixed concrete can meet the underwater concrete pouring requirement.
5) Other materials.
The well construction method comprises the following steps:
step 1, determining the hydrogeological conditions of a site: and (3) finding out the stratum structure of the monitoring point position, and finding out the buried depth of the stratum structure of the monitoring point position, each aquifer and the relative water barrier top and bottom plates. Wherein:
the stratum structure is from top to bottom in proper order: the aeration zone, the first aquifer, the first relative water barrier, the second aquifer and the second relative water barrier.
Step 2, drilling construction of a first aquifer (usually a diving aquifer, and sometimes an upper aquifer): drilling a hole into a first relative water barrier below a first aquifer with a drilling tool to form a first borehole; wherein:
drilling with a phi 550 drill to 1.0m of the first relative water barrier.
Step 3, first aquifer lower pipe: sequentially putting a large-diameter hard pipe and a sleeve into the first drilling hole from outside to inside, and sieving the large-diameter hard pipe at a position corresponding to the first aquifer to form a strainer so that water in the first aquifer enters a gap between the large-diameter hard pipe and the sleeve to serve as a first aquifer sampling section; wherein:
the large-diameter hard pipe is a DN450 hard PVC pipe, the sleeve is a phi 300 stainless steel sleeve, and the surface of the DN450 hard PVC pipe and the phi 300 stainless steel sleeve is left to be 0.5-1.0m above the ground and kept at the same height. And the DN450 hard PVC pipe is screened at the depth section of the first water-containing layer to be provided with a water filter pipe, and the other sections are solid pipes. The phi 300 stainless steel sleeves are all solid pipes.
Step 4, first water stopping: filling a water stop section in a gap between the large-diameter hard pipe in the first relative water-resisting layer and the sleeve, wherein the water stop section comprises a concrete section and a yellow mud section which are arranged from bottom to top; wherein:
the depth and height of the concrete injection are 0.5m, and the yellow soil input height is 0.5 m.
Step 5, forming a well by a first aquifer sampling section: in a gap between the large-diameter hard pipe and the wall of the first drilling hole, a concrete section and a yellow mud section are arranged from bottom to top at the position of a first relative water-resisting layer, a quartz sand filter material section is arranged at the position of a first water-bearing layer, and the yellow mud section and the concrete section are arranged from bottom to top at the position of an aeration zone.
Step 6, washing the well in a first aquifer sampling section: and repeatedly pumping water and flushing the well in the first aquifer sampling section until the water is cleaned. Pumping out the slurry in the phi 300 stainless steel sleeve and repeatedly washing, and after washing, using clean tap water to rinse the inner wall of the phi 300 stainless steel sleeve at least three times. After the well washing is completed, the first aquifer sampling section (a gap between the DN450 hard PVC pipe and the phi 300 stainless steel sleeve) is protected, and the pollution to the first aquifer sampling section in the subsequent construction process is prevented.
And 7, drilling construction of a second aquifer: drilling the bottom of the first drill hole in the casing into a second relative water-resisting layer below a second aquifer by using the drilling tool to form a second drill hole; wherein:
when a second borehole is drilled, a phi 300 stainless steel sleeve is put into the borehole and is used as a casing of the sleeve;
drilling with a phi 168 drill to 1.0m of the first relative water barrier.
Step 8, lowering the pipe in the second aquifer: a small-diameter hard pipe is arranged in the sleeve and the second drill hole, a sieve is arranged at the position of the small-diameter hard pipe corresponding to the second aquifer for arranging a water filtering pipe, so that water of the second aquifer enters the small-diameter hard pipe to be used as a second aquifer sampling section; wherein:
the small-diameter hard pipe is a DN80 hard PVC pipe, and the surface remaining height is the same as that of the DN450 hard PVC pipe and the phi 300 stainless steel sleeve.
Step 9, forming a well by a second aquifer sampling section: in a gap between the small-diameter hard pipe and the wall of a second drilling hole, a yellow mud section is arranged at the position of a second water-resisting layer, a quartz sand filter material section is arranged at the position of a second water-containing layer, and a yellow mud section is arranged at the position of a first water-resisting layer; a yellow mud section and a concrete section are arranged in a gap between the small-diameter hard pipe and the sleeve from bottom to top.
Step 10, washing the well in a second aquifer sampling section: the well is washed to the second aquifer sampling section of drawing water repeatedly and clean to water sand removal, and the second aquifer sampling section of dealing with carries out the secondary well washing simultaneously for preventing that the second aquifer sampling section from building the well construction in-process to produce the pollution to first aquifer sampling section.
Step 11, building a well platform and the like: design the well head and set up the well platform according to the well head shape, the well platform can be concrete or brick structure, sets up the well platform lid that can open and shut, places the well tablet, and monitoring well construction is accomplished.
Further, groundwater layering sampling is the layering sampling to 2 aquifers below the ground, utilizes to set up the sleeve pipe and separates aquifer groundwater, adopts multiple stagnant water measures such as concreting, input yellow earth, accomplishes 2 aquifers and thoroughly keeps apart the stagnant water, has guaranteed the accurate nature of layering sampling to satisfy a monitoring well and can accomplish 2 aquifer groundwater layering sampling simultaneously, and can regard as the long-term monitoring well use of groundwater layering sampling.
Furthermore, the well construction method of the invention aims at the underground water environment survey of a common pollution site and carries out layered sampling monitoring on 2 aquifers below the ground. Aiming at individual special sites, the number of the monitoring aquifers is more than 2, and the monitoring aquifers can be properly improved and reformed according to the design principle of the invention and can also meet the requirements of monitoring tasks.
The invention has the advantages that:
the invention can complete the construction of the monitoring well by one-time construction, and realizes the layered sampling of the groundwater of 2 aquifers below the ground in one monitoring well by carrying out special structural design on the monitoring well. The sleeve is arranged to separate groundwater of 2 aquifers below the ground, multiple water stopping measures such as concrete pouring, yellow soil throwing and the like are adopted, the complete isolation and water stopping of the 2 aquifers are completed, and the accuracy of layered sampling is guaranteed; meanwhile, the method has the advantages of simple construction process, strong practicability and strong operability, and meets the long-term monitoring requirement of underground water layered sampling.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (5)

1. A well construction method for an underground water stratified sampling monitoring well is characterized by comprising the following steps:
step 1, determining the hydrogeological conditions of a site: finding out a stratum structure of a monitoring point position, wherein the stratum structure sequentially comprises the following steps from top to bottom: an aeration zone, a first aquifer, a first relative water barrier, a second aquifer and a second relative water barrier;
step 2, drilling construction of a first aquifer: drilling a hole into a first relative water barrier below a first aquifer with a drilling tool to form a first borehole;
step 3, first aquifer lower pipe: sequentially putting a large-diameter hard pipe and a sleeve into the first drilling hole from outside to inside, and sieving the large-diameter hard pipe at a position corresponding to the first aquifer to form a strainer so that water in the first aquifer enters a gap between the large-diameter hard pipe and the sleeve to serve as a first aquifer sampling section;
step 4, first water stopping: filling a water stop section in a gap between the large-diameter hard pipe and the casing pipe in the first relative water-resisting layer; wherein the water stop section comprises a concrete section and a yellow mud section which are arranged from bottom to top;
step 5, forming a well by a first aquifer sampling section: in a gap between the large-diameter hard pipe and the wall of the first drilled hole, a concrete section and a yellow mud section are arranged from bottom to top at the position of the first relative water-resisting layer, a quartz sand filter material section is arranged at the position of the first aquifer, and a yellow mud section and a concrete section are arranged from bottom to top at the position of the aeration zone;
and 6, drilling construction of a second aquifer: drilling continuously into a second relative water-resisting layer below a second aquifer at the bottom of the first drill hole in the casing by using the drilling tool to form a second drill hole;
step 7, lowering the pipe in the second aquifer: a small-diameter hard pipe is arranged in the sleeve and the second drill hole, a strainer is arranged at the position of the small-diameter hard pipe corresponding to the second aquifer in a screening mode, and water of the second aquifer enters the small-diameter hard pipe to serve as a second aquifer sampling section;
step 8, forming a well by a second aquifer sampling section: in a gap between the small-diameter hard pipe and the wall of a second drilling hole, a yellow mud section is arranged at the position of a second relative water-resisting layer, a quartz sand filter material section is arranged at the position of a second water-containing layer, and a yellow mud section is arranged at the position of a first relative water-resisting layer; and a yellow mud section and a concrete section are arranged in a gap between the small-diameter hard pipe and the sleeve from bottom to top.
2. The well construction method of claim 1, further comprising, between the steps 5 and 6:
and 9, washing the well in the first aquifer sampling section.
3. The well construction method of claim 1, further comprising, after step 8:
and 10, washing the well in a second aquifer sampling section.
4. The well construction method according to claim 1, wherein the upper ends of the large-diameter hard pipe, the casing pipe and the small-diameter hard pipe all extend above the ground, and the heights of the upper surfaces are consistent.
5. The well construction method of claim 4, wherein a well cap is provided on the large-diameter hard pipe, the casing pipe and the small-diameter hard pipe, and a well platform is provided on the ground outside the well cap.
CN201910931296.1A 2019-09-29 2019-09-29 Well construction method for underground water layered sampling monitoring well Active CN110671053B (en)

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