CN111411901A - Small-caliber shallow groundwater nested monitoring well and well completion method thereof - Google Patents
Small-caliber shallow groundwater nested monitoring well and well completion method thereof Download PDFInfo
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- CN111411901A CN111411901A CN202010347361.9A CN202010347361A CN111411901A CN 111411901 A CN111411901 A CN 111411901A CN 202010347361 A CN202010347361 A CN 202010347361A CN 111411901 A CN111411901 A CN 111411901A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1035—Wear protectors; Centralising devices, e.g. stabilisers for plural rods, pipes or lines, e.g. for control lines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Abstract
The invention discloses a small-caliber shallow groundwater nested monitoring well and a well completion method thereof, wherein the monitoring well comprises an outer pipe and a plurality of monitoring well pipes, the monitoring well pipes are correspondingly arranged according to the number of aquifers of a detection section, the plurality of monitoring well pipes are all inserted into the inner cavity of the outer pipe, and the well completion method comprises the following steps: step one, surveying and drilling; step two, well drilling construction; step three, replacing the slurry with clear water; step four, arranging an outer pipe centralizer; step five, filling; step six, washing the well; seventhly, putting in a monitoring well pipe; step eight, lowering the 1# monitoring well pipe; step nine, filling; step ten, lowering the 2# monitoring well pipe; step eleven, filling; step twelve, lowering the 3# monitoring well pipe; fixing the monitoring well pipe; fourteen, monitoring the completion of the lowering of the well pipe; step fifteen, well washing; sixthly, measuring the water level; seventhly, installing a protective cover. Has the advantages that: construction cost is reduced, and the blank of shallow groundwater nested monitoring well construction is filled.
Description
Technical Field
The invention relates to a nest type monitoring well and a well completion method thereof, in particular to a small-caliber shallow groundwater nest type monitoring well and a well completion method thereof.
Background
At present, with increasing attention of people to the environment, pollution source monitoring needs to be refined more and more, and people need to know the pollution degree timely and accurately. The existing monitoring wells mainly monitor a relatively large aquifer, effective monitoring on underground water with a thin aquifer and a relatively dense aquifer is difficult to realize, the nest type monitoring wells which are put into the most pipes at the present stage are five wells with one hole, and the monitoring levels are few; at present, a continuous multi-channel monitoring well can only monitor seven layers at most, but the aperture of a monitoring well pipe is small, and the difficulty of subsequent water taking is large.
Disclosure of Invention
The invention mainly aims to solve the key technical problems that the minimum water stop layer thickness of the traditional nest type monitoring well is difficult to determine, the water stop effect among monitoring pipes is poor, the pipe descending difficulty is large and the like;
it is another object of the present invention to provide a method of monitoring a well;
the invention provides a small-caliber shallow underground water nested monitoring well and a well completion method thereof in order to achieve the aim and solve the problems.
The small-caliber shallow groundwater nested monitoring well comprises an outer pipe and a plurality of monitoring well pipes, wherein the plurality of monitoring well pipes are correspondingly arranged according to the number of aquifers of a detection section, the plurality of monitoring well pipes are all inserted into an inner cavity of the outer pipe, each monitoring well pipe is arranged corresponding to one aquifer, the bottom end of each monitoring well pipe is located in the corresponding aquifer, and a groundwater automatic detector is arranged in the monitoring well pipe located in the aquifer.
The top cover of outer tube is equipped with the well head safety cover, is provided with the outer tube centralizer on the lateral wall of outer tube, and the material of outer tube is PVC-U, and the position that the outer tube is located the aquifer comprises the strainer, and the position that the outer tube is located the aquifer comprises the riser, and the connected mode of the vertical direction of outer tube adopts the grafting mode to connect, and the outer tube of upper and lower adjacent paragraph is glued with the environmental protection and is bonded fixedly.
One monitoring well pipe among several monitoring well pipes sets up the central part at the outer tube cavity, the monitoring well pipe border of remaining monitoring well pipe equipartition in center department, the aquifer department at deepest is established to the monitoring well pipe at central part, all the other monitoring well pipes are laid according to the aquifer from depth to shallow in proper order, the upper portion of monitoring well pipe is equipped with spacing dish and support frame, during the packing, the support frame is fixed with spacing dish, pack through the space of support frame with the well head safety cover, the section that the monitoring well pipe is located the aquifer comprises the strainer, the section that the monitoring well pipe is located the aquifer comprises the riser, the material of monitoring well pipe is PVC-U, the connected mode of monitoring well pipe vertical direction adopts the grafting mode to connect, the monitoring well pipe of upper and lower adjacent section is fixed with environmental protection glue, adopt first inner tube centralizer or second centralizer or third inner tube centralizer respectively according to the monitoring well pipe of inserting different degree of depth aquifer to monitor well pipe and carry out the solid And (4) determining.
The first inner tube centralizer is cross structure, the centre of first inner tube centralizer is provided with the sleeve pipe, the sleeve pipe is provided with cross dead lever outward, the second inner tube centralizer comprises two sleeve pipes, be provided with the dead lever between two sleeve pipes, the third inner tube centralizer is the triangle-shaped structure, triangle-shaped's three apex angle department is provided with the sleeve pipe, be provided with the dead lever between adjacent sleeve pipe, the monitoring well casing is inserted and is established in the sleeve pipe, the dead lever outside the sleeve pipe is used for monitoring the fixed connection of well casing.
The model of the automatic underground water detector is HOB L-U20.
The invention provides a well completion method of a small-caliber shallow groundwater nested monitoring well, which comprises the following steps:
firstly, surveying and drilling, coring in a whole hole, and preliminarily determining the positions and depths of a aquifer and a water-resisting layer; then carrying out geophysical logging and drawing a logging curve, then comparing with a coring result to ensure that the water stop position is accurate, and finally dividing a monitoring target layer; according to a ground test, the thickness of the water stopping layer cannot be less than 2 meters;
step two, reaming the exploration hole by adopting a positive circulation drilling machine, and performing drilling construction by adopting a mode of one-diameter-to-bottom;
step three, replacing slurry with clean water after drilling is finished, increasing the well washing effect and simultaneously reducing the resistance during pipe discharging;
dividing the positions of the water filter pipes and the marine riser on the outer pipe according to the compared logging curves, uniformly arranging three outer pipe centralizers at the middle position of each section of marine riser on the outer pipe, then placing the outer pipe in the monitoring well in sequence, and controlling the outer pipe at the central position of the monitoring well during pipe descending;
step five, layered filling is carried out in the annular gap between the outer pipe and the drill hole, the filling is gravel and clay balls, the filling is slowly surrounded and filled, the filling is measured at the same time, the filling height is controlled at any time, and the using amount of the gravel and the clay balls is accurately calculated in the process;
step six, adopting an air compressor to carry out vibration well washing;
seventhly, performing second well formation after the first well formation is completed, namely putting monitoring well pipes into the inner cavity of the outer pipe, wherein the gaps among the monitoring well pipes cannot be smaller than 20mm, lowering the monitoring well pipes into the inner cavity of the outer pipe layer by layer, sequentially numbering the monitoring well pipes from deep to shallow and from deep to shallow into 1# and 2#. the monitoring well pipes from deep to shallow, fixing a first inner pipe centralizer or a second inner pipe centralizer or a third inner pipe centralizer at the bottom of the monitoring well pipes before pipe lowering, and ensuring that the pipe spacing of each monitoring well pipe meets the requirement while ensuring that the monitoring well pipes are positioned in the center of the monitoring well;
step eight, when the 1# monitoring well pipe at the deepest part is lowered, the first inner pipe centralizer is fixed at the bottom of the 1# monitoring well pipe at the deepest part and is fixed, so that the horizontal displacement of the 1# monitoring well pipe at the deepest part is limited, and the 1# monitoring well pipe is ensured to be positioned at the central positions of the monitoring well and the outer pipe;
fixing the upper part of the No. 1 monitoring well pipe through a limiting disc and a support frame, then filling an annular gap between the monitoring well pipe and an outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one by one, the filling is performed slowly and surrounded, the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step ten, when the No. 2 monitoring well pipe is lowered, the second inner pipe centralizer is fixed at the bottom of the No. 2 monitoring well pipe and is fixed, then the No. 1 monitoring well pipe is inserted into the other sleeve of the second inner pipe centralizer, and the displacement of the No. 2 monitoring well pipe in the horizontal direction is limited while the distance between the No. 1 monitoring well pipe and the No. 2 monitoring well pipe is ensured;
step eleven, fixing the upper parts of the No. 1 monitoring well pipe and the No. 2 monitoring well pipe through a limiting disc and a supporting frame, then filling an annular gap between the monitoring well pipe and the outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one to one, the filling is performed slowly in a surrounding manner, the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step twelve, when the 3# monitoring well pipe is lowered, the third inner pipe centralizer is fixed at the bottom of the 3# monitoring well pipe and is fixed, then the 1# monitoring well pipe and the 2# monitoring well pipe are inserted into the other two sleeves of the third inner pipe centralizer, and the displacement of the 3# monitoring well pipe in the horizontal direction is limited while the distance between the three monitoring well pipes is ensured;
fixing the upper parts of the No. 1 monitoring well pipe, the No. 2 monitoring well pipe and the No. 3 monitoring well pipe through a limiting disc and a supporting frame, then filling an annular gap between the monitoring well pipe and an outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one to one, and the filling process needs to be performed by slow enclosing filling, and the filling process needs to be performed along with the measurement, and the using amounts of gravel materials and clay balls need to be accurately calculated in the filling process;
fourteenth, when the rest monitoring well pipes are arranged, the horizontal displacement of the rest monitoring well pipes is limited by the first two monitoring well pipes and the third inner pipe centralizer, and the operation method from the twelfth step to the thirteenth step is repeated until all the monitoring well pipes are completely lowered;
fifthly, after pipe laying and packing are completed in sequence, carrying out air compressor vibration well washing on a plurality of monitoring well pipes in sequence, wherein the well washing sequence is from shallow to deep;
sixthly, measuring the water level in the monitoring well pipes, and respectively placing the underground water automatic detectors below the water level in each monitoring well pipe;
seventhly, fixing the upper parts of the monitoring well pipes by using a limiting disc, plugging the top of the outer pipe and installing a wellhead protection cover.
The invention has the beneficial effects that:
the small-caliber shallow groundwater nested monitoring well and the well completion method thereof can monitor a plurality of aquifers in the same monitoring well, and can finely monitor the diffusion of pollution sources. The invention solves the technical problems of water stopping, tube discharging and the like among multiple tubes, and ensures that the monitoring data is more real, effective and accurate. The site construction process has operability and is convenient to popularize and use. Although the monitored positions become more, the construction caliber is smaller, the occupied area is smaller, and the construction cost is reduced. The invention can effectively monitor the dynamic condition of the underground water, provides reliable guarantee for monitoring the shallow underground water and pollution sources, and fills the blank of the construction of the shallow underground water nested monitoring well.
Drawings
Fig. 1 is a schematic view of a main view structure of the nested monitoring well according to the invention.
Fig. 2 is a schematic top sectional view of the nested monitoring well according to the present invention.
FIG. 3 is a schematic view of a partially enlarged structure of the bottommost monitoring well pipe according to the present invention.
Fig. 4 is a schematic view of a partially enlarged structure of a monitoring well pipe of the lower part of the present invention.
FIG. 5 is a schematic structural view of a first inner tube centralizer according to the present invention.
FIG. 6 is a schematic structural view of a second inner tube centralizer according to the present invention.
FIG. 7 is a schematic structural view of a third inner tube centralizer according to the present invention.
Fig. 8 is a schematic view of the state of the packing according to the present invention.
The labels in the above figures are as follows:
1. automatic detector for outer pipe 2, monitoring well pipe 3, aquifer 4 and underground water
5. Well head safety cover 6, outer tube centralizer 7, water barrier 8, spacing dish
9. Support frame 10, first inner tube centralizer 11, second inner tube centralizer
12. A third inner tube centralizer 13, a sleeve 14 and a fixing rod.
Detailed Description
Please refer to fig. 1 to 8:
the small-caliber shallow-layer underground water nest type monitoring well comprises an outer pipe 1 and monitoring well pipes 2, seven monitoring well pipes 2 are correspondingly arranged according to the number of aquifers 3 in a detection section, the seven monitoring well pipes 2 are all inserted into the inner cavity of the outer pipe 1, each monitoring well pipe 2 is arranged corresponding to one aquifer 3, the bottom end of each monitoring well pipe 2 is located in the corresponding aquifer 3, and an underground water automatic detector 4 is arranged in the monitoring well pipe 2 located in the aquifer 3.
The top cover of outer tube 1 is equipped with well head safety cover 5, is provided with outer tube centralizer 6 on the lateral wall of outer tube 1, and the material of outer tube 1 is PVC-U, and the position that outer tube 1 is located aquifer 3 comprises the strainer, and the position that outer tube 1 is located water barrier 7 comprises the water barrier, and the connected mode of the vertical direction of outer tube 1 adopts the grafting mode to connect, and the outer tube 1 of upper and lower adjacent paragraph glues fixedly with the environmental protection.
One monitoring well pipe 2 of seven monitoring well pipes 2 is arranged at the central part of an inner cavity of an outer pipe 1, the other six monitoring well pipes 2 are uniformly distributed on the periphery of the monitoring well pipe 2 at the center, the monitoring well pipe 2 at the central part is arranged at a water-bearing layer 3 at the deepest part, the other monitoring well pipes 2 are sequentially distributed from deep to shallow according to the water-bearing layer 3, the upper part of the monitoring well pipe 2 is provided with a limiting disc 8 and a supporting frame 9, during filling, the supporting frame 9 fixes the limiting disc 8, filling is carried out through a gap between the supporting frame 9 and a well head protective cover 5, the section of the monitoring well pipe 2 at the water-bearing layer 3 is composed of water filter pipes, the section of the monitoring well pipe 2 at the water-bearing layer 7 is composed of water-resisting pipes, the material of the monitoring well pipe 2 is PVC-U, the connection mode of the monitoring well pipes 2 in the vertical direction, and fixing the monitoring well pipe 2 by adopting a first inner pipe centralizer 10, a second inner pipe centralizer 11 or a third inner pipe centralizer 12 respectively according to the monitoring well pipe 2 inserted into aquifers 3 of different depths.
First inner tube centralizer 10 is cross structure, the centre of first inner tube centralizer 10 is provided with sleeve pipe 13, sleeve pipe 13 is provided with cross dead lever 14 outward, second inner tube centralizer 11 comprises two sleeve pipes 13, be provided with dead lever 14 between two sleeve pipes 13, third inner tube centralizer 12 is the triangle-shaped structure, triangle-shaped's three apex angle department is provided with sleeve pipe 13, be provided with dead lever 14 between adjacent sleeve pipe 13, monitoring well casing 2 is inserted and is established in sleeve pipe 13, dead lever 14 outside sleeve pipe 13 is used for monitoring the fixed connection of well casing 2.
The model of the automatic groundwater detector 4 is BOBOBO-U20.
The invention provides a well completion method of a small-caliber shallow groundwater nested monitoring well, which comprises the following steps:
firstly, surveying and drilling, coring in a whole hole, and preliminarily determining the positions and the depths of the aquifer 3 and the aquifer 7; then carrying out geophysical logging and drawing a logging curve, then comparing with a coring result to ensure that the water stop position is accurate, and finally dividing a monitoring target layer; according to a ground test, the thickness of the water stopping layer cannot be less than 2 meters;
step two, reaming the exploration hole by adopting a positive circulation drilling machine, and performing drilling construction by adopting a mode of one-diameter-to-bottom;
step three, replacing slurry with clean water after drilling is finished, increasing the well washing effect and simultaneously reducing the resistance during pipe discharging;
dividing the positions of the water filter pipes and the riser pipes on the outer pipe 1 according to the compared logging curves, uniformly arranging three outer pipe centralizers 6 at the middle position of each section of riser pipe on the outer pipe 1, then sequentially placing the outer pipe 1 in the monitoring well, and controlling the outer pipe 1 to be in the central position of the monitoring well during pipe descending;
step five, layered filling is carried out in the annular gap between the outer pipe 1 and the drill hole, the filling is gravel and clay balls, the filling is slowly surrounded and filled, the filling is measured at the same time, the filling height is controlled at any time, and the using amount of the gravel and the clay balls is accurately calculated in the process;
step six, adopting an air compressor to carry out vibration well washing;
seventhly, performing second well formation after the first well formation is completed, namely, putting the monitoring well pipes 2 into the inner cavity of the outer pipe 1, wherein the gaps among the monitoring well pipes 2 cannot be smaller than 20mm, putting the monitoring well pipes 2 into the inner cavity of the outer pipe 1 layer by layer, sequentially numbering the monitoring well pipes from deep to shallow into 1# and 2# in sequence, fixing the first inner pipe centralizer 10 or the second inner pipe centralizer 11 or the third inner pipe centralizer 12 at the bottoms of the monitoring well pipes 2 before pipe laying, and aiming at ensuring that the distance between the monitoring well pipes 2 meets the requirement while ensuring that the monitoring well pipes 2 are positioned in the centers of the monitoring wells;
step eight, when the 1# monitoring well pipe 2 at the deepest part is lowered, the first inner pipe centralizer 10 is fixed at the bottom of the 1# monitoring well pipe 2 at the deepest part and is fixed, the horizontal displacement of the 1# monitoring well pipe 2 at the deepest part is limited, and the 1# monitoring well pipe 2 is ensured to be located at the central positions of the monitoring well and the outer pipe 1;
fixing the upper part of the No. 1 monitoring well pipe 2 through a limiting disc 8 and a supporting frame 9, then filling an annular gap between the monitoring well pipe 2 and an outer pipe 1 to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe 1 one by one, the filling is performed slowly in a surrounding manner, the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step ten, when the No. 2 monitoring well pipe 2 is lowered, the second inner pipe centralizer 11 is fixed at the bottom of the No. 2 monitoring well pipe 2 and is fixed, then the No. 1 monitoring well pipe 2 is inserted into the other casing 13 of the second inner pipe centralizer 11, and the displacement of the No. 2 monitoring well pipe 2 in the horizontal direction is limited while the distance between the No. 1 monitoring well pipe 2 and the No. 2 monitoring well pipe 2 is ensured;
step eleven, fixing the upper parts of the No. 1 monitoring well pipe 2 and the No. 2 monitoring well pipe 2 through a limiting disc 8 and a supporting frame 9, then filling an annular gap between the monitoring well pipe 2 and the outer pipe 1 to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe 1 one by one, and the filling is performed slowly and surrounded, and the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step twelve, when the 3# monitoring well pipe 2 is lowered, the third inner pipe centralizer 12 is fixed at the bottom of the 3# monitoring well pipe 2 and is fixed, and then the 1# monitoring well pipe 2 and the 2# monitoring well pipe 2 are inserted into the other two sleeves 13 of the third inner pipe centralizer 12, so that the displacement of the 3# monitoring well pipe 2 in the horizontal direction is limited while the distance between the three monitoring well pipes 2 is ensured;
thirteen, fixing the upper parts of the No. 1 monitoring well pipe 2, the No. 2 monitoring well pipe 2 and the No. 3 monitoring well pipe 2 through a limiting disc 8 and a supporting frame 9, then filling the annular gap between the monitoring well pipe 2 and the outer pipe 1 to a specified height, wherein the filling position corresponds to the outer pipe filling position one by one, the filling is slowly surrounded and filled, the filling is carried out at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
fourteenth, when the rest monitoring well pipes 2 are arranged, the horizontal displacement of the rest monitoring well pipes is limited by the first two monitoring well pipes 2 and the third inner pipe centralizer 12, and the operation method from the twelfth step to the thirteenth step is repeated until all the monitoring well pipes 2 are completely lowered;
fifthly, after pipe laying and packing are sequentially finished, sequentially carrying out air compressor vibration well washing on the seven monitoring well pipes 2, wherein the well washing sequence is from shallow to deep;
sixthly, measuring the water level in the monitoring well pipes 2, and respectively placing the underground water automatic detectors 4 below the water level in each monitoring well pipe 2;
seventhly, fixing the upper parts of the monitoring well pipes 2 by using a limiting disc 8, plugging the top of the outer pipe 1 and installing a wellhead protection cover 5.
Claims (6)
1. The utility model provides a small-bore shallow layer groundwater nested monitoring well which characterized in that: including outer tube and monitoring well casing, the quantity monitoring well casing correspondence according to detecting the paragraph aquifer is provided with the several, and the several monitoring well casing is all inserted and is established in the inner chamber of outer tube, and every monitoring well casing all corresponds the setting of one deck aquifer, and the bottom of every monitoring well casing all is located the aquifer that corresponds, is located the intraductal groundwater automatic detector that is provided with of monitoring well casing in the aquifer.
2. The small-caliber shallow groundwater nested monitoring well according to claim 1, wherein: the top cover of outer tube be equipped with the well head safety cover, be provided with the outer tube centralizer on the lateral wall of outer tube, the material of outer tube is PVC-U, the position that the outer tube is located the aquifer comprises the strainer, the position that the outer tube is located the aquifer comprises the riser, the connected mode of the vertical direction of outer tube adopts the grafting mode to connect, the outer tube of upper and lower adjacent paragraph is glued with the environmental protection and is bonded fixedly.
3. The small-caliber shallow groundwater nested monitoring well as claimed in claim 1 or 2, wherein: the monitoring well pipe of several monitoring well pipes set up the central point in the outer tube cavity, the monitoring well pipe border of remaining monitoring well pipe equipartition in center department, the aquifer department at deepest is established to the monitoring well pipe of central point, all the other monitoring well pipes are laid according to the aquifer from depth to shallow in proper order, the upper portion of monitoring well pipe is equipped with spacing dish and support frame, during the packing, the support frame is fixed with spacing dish, pack through the space of support frame with the well head safety cover, the section that the monitoring well pipe is located the aquifer comprises the strainer, the section that the monitoring well pipe is located the aquifer comprises the riser, the material of monitoring well pipe is PVC-U, the connected mode of monitoring well pipe vertical direction adopts the grafting mode to connect, the environmental protection glue of the monitoring well pipe of upper and lower adjacent section is fixed with bonding, adopt first inner tube centralizer or second inner tube centralizer or third inner tube centralizer respectively to carry out monitoring well centralizer according to the monitoring well pipe that inserts different degree of depth And (5) fixing the tube.
4. The small-caliber shallow groundwater nested monitoring well according to claim 3, wherein: the first inner tube centralizer is of a cross-shaped structure, a sleeve is arranged in the middle of the first inner tube centralizer, a cross-shaped fixing rod is arranged outside the sleeve, the second inner tube centralizer is composed of two sleeves, the fixing rod is arranged between the two sleeves, the third inner tube centralizer is of a triangular structure, sleeves are arranged at three triangular vertex angles, the fixing rod is arranged between every two adjacent sleeves, a monitoring well pipe is inserted into the sleeves, and the fixing rod outside the sleeves is used for fixedly connecting the monitoring well pipe.
5. The small-caliber shallow groundwater nested monitoring well according to claim 1, wherein: the model of the automatic underground water detector is BOBOBO-U20.
6. A well completion method of a small-caliber shallow groundwater nested monitoring well is characterized by comprising the following steps: the method comprises the following steps:
firstly, surveying and drilling, coring in a whole hole, and preliminarily determining the positions and depths of a aquifer and a water-resisting layer; then carrying out geophysical logging and drawing a logging curve, then comparing with a coring result to ensure that the water stop position is accurate, and finally dividing a monitoring target layer; according to a ground test, the thickness of the water stopping layer cannot be less than 2 meters;
step two, reaming the exploration hole by adopting a positive circulation drilling machine, and performing drilling construction by adopting a mode of one-diameter-to-bottom;
step three, replacing slurry with clean water after drilling is finished, increasing the well washing effect and simultaneously reducing the resistance during pipe discharging;
dividing the positions of the water filter pipes and the marine riser on the outer pipe according to the compared logging curves, uniformly arranging three outer pipe centralizers at the middle position of each section of marine riser on the outer pipe, then placing the outer pipe in the monitoring well in sequence, and controlling the outer pipe at the central position of the monitoring well during pipe descending;
step five, layered filling is carried out in the annular gap between the outer pipe and the drill hole, the filling is gravel and clay balls, the filling is slowly surrounded and filled, the filling is measured at the same time, the filling height is controlled at any time, and the using amount of the gravel and the clay balls is accurately calculated in the process;
step six, adopting an air compressor to carry out vibration well washing;
seventhly, performing second well formation after the first well formation is completed, namely putting monitoring well pipes into the inner cavity of the outer pipe, wherein the gaps among the monitoring well pipes cannot be smaller than 20mm, lowering the monitoring well pipes into the inner cavity of the outer pipe layer by layer, sequentially numbering the monitoring well pipes from deep to shallow and from deep to shallow into 1# and 2#. the monitoring well pipes from deep to shallow, fixing a first inner pipe centralizer or a second inner pipe centralizer or a third inner pipe centralizer at the bottom of the monitoring well pipes before pipe lowering, and ensuring that the pipe spacing of each monitoring well pipe meets the requirement while ensuring that the monitoring well pipes are positioned in the center of the monitoring well;
step eight, when the 1# monitoring well pipe at the deepest part is lowered, the first inner pipe centralizer is fixed at the bottom of the 1# monitoring well pipe at the deepest part and is fixed, so that the horizontal displacement of the 1# monitoring well pipe at the deepest part is limited, and the 1# monitoring well pipe is ensured to be positioned at the central positions of the monitoring well and the outer pipe;
fixing the upper part of the No. 1 monitoring well pipe through a limiting disc and a support frame, then filling an annular gap between the monitoring well pipe and an outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one by one, the filling is performed slowly and surrounded, the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step ten, when the No. 2 monitoring well pipe is lowered, the second inner pipe centralizer is fixed at the bottom of the No. 2 monitoring well pipe and is fixed, then the No. 1 monitoring well pipe is inserted into the other sleeve of the second inner pipe centralizer, and the displacement of the No. 2 monitoring well pipe in the horizontal direction is limited while the distance between the No. 1 monitoring well pipe and the No. 2 monitoring well pipe is ensured;
step eleven, fixing the upper parts of the No. 1 monitoring well pipe and the No. 2 monitoring well pipe through a limiting disc and a supporting frame, then filling an annular gap between the monitoring well pipe and the outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one to one, the filling is performed slowly in a surrounding manner, the filling is performed at any time, and the using amounts of gravel materials and clay balls are accurately calculated in the filling process;
step twelve, when the 3# monitoring well pipe is lowered, the third inner pipe centralizer is fixed at the bottom of the 3# monitoring well pipe and is fixed, then the 1# monitoring well pipe and the 2# monitoring well pipe are inserted into the other two sleeves of the third inner pipe centralizer, and the displacement of the 3# monitoring well pipe in the horizontal direction is limited while the distance between the three monitoring well pipes is ensured;
fixing the upper parts of the No. 1 monitoring well pipe, the No. 2 monitoring well pipe and the No. 3 monitoring well pipe through a limiting disc and a supporting frame, then filling an annular gap between the monitoring well pipe and an outer pipe to a specified height, wherein the filling positions correspond to the filling positions of the outer pipe one to one, and the filling process needs to be performed by slow enclosing filling, and the filling process needs to be performed along with the measurement, and the using amounts of gravel materials and clay balls need to be accurately calculated in the filling process;
fourteenth, when the rest monitoring well pipes are arranged, the horizontal displacement of the rest monitoring well pipes is limited by the first two monitoring well pipes and the third inner pipe centralizer, and the operation method from the twelfth step to the thirteenth step is repeated until all the monitoring well pipes are completely lowered;
fifthly, after pipe laying and packing are completed in sequence, carrying out air compressor vibration well washing on a plurality of monitoring well pipes in sequence, wherein the well washing sequence is from shallow to deep;
sixthly, measuring the water level in the monitoring well pipes, and respectively placing the underground water automatic detectors below the water level in each monitoring well pipe;
seventhly, fixing the upper parts of the monitoring well pipes by using a limiting disc, plugging the top of the outer pipe and installing a wellhead protection cover.
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