CN117703506A - Multi-aquifer layered drainage test method for straight-through drainage drilling - Google Patents
Multi-aquifer layered drainage test method for straight-through drainage drilling Download PDFInfo
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- CN117703506A CN117703506A CN202311674685.3A CN202311674685A CN117703506A CN 117703506 A CN117703506 A CN 117703506A CN 202311674685 A CN202311674685 A CN 202311674685A CN 117703506 A CN117703506 A CN 117703506A
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- 238000005553 drilling Methods 0.000 title claims abstract description 70
- 238000010998 test method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 136
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 239000002775 capsule Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 10
- 239000003657 drainage water Substances 0.000 claims abstract 4
- 230000000694 effects Effects 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000005086 pumping Methods 0.000 abstract description 17
- 239000011435 rock Substances 0.000 abstract description 5
- 238000009933 burial Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 208000008918 voyeurism Diseases 0.000 description 1
Abstract
The invention discloses a multi-aquifer layered water drainage test method for a straight-through water drainage borehole, which specifically comprises the following steps: drilling holes to underground construction groups, including water drainage drilling and monitoring drilling, exposing the bottoms of all the holes, installing an underground water drainage pipeline, and installing a stop valve, a pressure gauge and a flow measuring device; opening a valve of a drainage pipeline in a drainage drilling well, measuring the change of the drainage water quantity of the hole and the change of the water pressure of a monitoring drilling hole, recording the drainage water quantity and the water pressure of the drainage drilling hole and the monitoring drilling hole after the water quantity is stable, and putting a water-proof capsule to the bottom of a test section to pressurize the water-proof capsule; and lifting the water-proof capsule to the previous water-proof layer after pressure release, and pressurizing water-proof until the hydrogeological parameter test of the uppermost water-proof layer is completed. The method overcomes the defects that the water level of the rock stratum to be tested of the water pumping hole cannot be reduced to the minimum level due to the limitations of conditions such as the bore diameter of the bore, the position and the length of the measuring section, the characteristics of the water pump, the rock stratum burial depth and the like in the water pumping test, and the measured hydrogeological parameters under different conditions have larger differences.
Description
Technical Field
The invention belongs to the technical field of mine hydrogeology testing, and particularly relates to a multi-aquifer layered drainage test method for a straight-through drainage borehole.
Background
The precondition for preventing and controlling mine water damage is that the hydrogeological parameters (permeability coefficient of aquifer, dynamic water supply quantity, static reserve, hydrology, water level, water quality and the like) need to be explored clearly. The conventional mine hydrogeological condition exploration method adopted at home and abroad is carried out by adopting a group of ground drilling and then carrying out a water pumping test. The conventional pumping test is to pump water from one drilling hole, measure water level from other drilling holes, pump water according to the collected certain water amount to form a funnel-shaped water level line, calculate the permeability coefficient of the aquifer by using a formula and calculate other hydrogeological parameters. If multiple aquifers or huge aquifers (for example, the thickness of a sandstone aquifer region of a Huang Long coal field Luohe group can reach more than 300 m) are needed to be subjected to a layered pumping test, a method of vertically isolating double packers and arranging submersible pumps in the middle for pumping water is adopted, but the position and the length of a double-packer measuring section can have a certain influence on a test result.
Hydrogeologic parameter exploration using a water pumping test from a surface borehole is currently the conventional test method. The method has the advantages of simplicity and easiness, and can qualitatively calibrate the hydrogeologic characteristics of the rock stratum, such as water enrichment, permeability and the like. However, because the pumping test needs to adopt the immersible pump to pump out the water at the bottom of the drill hole, the conditions such as drilling aperture, survey section position length, water pump characteristic, stratum burial depth limit, can't reduce the water level of the measured stratum of pumping hole to the minimum, the hydrogeological parameter of measuring under different conditions can produce great difference.
Disclosure of Invention
The invention aims to provide a multi-aquifer layered drainage test method for a straight-through drainage borehole, which improves the measurement accuracy of hydrogeological parameters.
The technical scheme adopted by the invention is that the multi-water-bearing layer layered water discharge test method for the through water discharge drilling comprises the following steps:
step 1, selecting a proper position from the ground to perform test drilling to a downhole construction group, wherein the test drilling comprises water drainage drilling and monitoring drilling;
step 2, adopting underground roadway construction to reveal the bottoms of all holes, respectively installing an underground sewer pipe, installing a stop valve, a pressure gauge and a flow measuring device on the underground sewer pipe, closing all valves of the underground sewer pipe with drilled holes, and measuring the original water pressure from the pressure gauge; hoisting a water-proof air bag at the orifice of each hole, and connecting a nitrogen high-pressure air bottle;
step 3, opening a valve of a drainage borehole underground drainage pipeline, synchronously measuring the change of the drainage volume of the borehole and the change of the water pressure of the monitoring borehole until the drainage volume of the drainage borehole is stable, and recording the drainage volume and the water pressure of the drainage borehole and the monitoring borehole, wherein the sum of the drainage volumes of the two boreholes is the total drainage volume and is used as the stratum total aquifer parameter test data of a complete drainage test;
step 4, a water-proof capsule is put into the water-proof drill hole to the bottom of the test section, the water-proof capsule is pressurized, the water quantity of the upper water-bearing layer is blocked from being leaked, and the water-proof effect of the water-proof capsule is tested;
step 5, lifting the water-proof capsule to the previous water-proof layer after pressure relief, pressurizing and isolating water, recording the water-release amount and monitoring the water pressure of the drilling hole after the water-release amount of the water-release drilling hole is stable, and taking the water-release amount and the monitoring water pressure of the drilling hole as water-bearing layer parameter test data of the water-bearing stratum below;
and 6, repeating the operation in the step 5 until the hydrogeological parameter test of the uppermost aquifer of the test section is completed, and obtaining the water discharge quantity of the stratum of each test section and monitoring the water pressure of the drilling hole.
The present invention is also characterized in that,
in the step 1, the upper parts of the drainage drilling hole and the monitoring drilling hole are sleeved with cement slurry to fix pipes, the test sections of the drainage drilling hole and the monitoring drilling hole are small-diameter drainage pipe protection holes, and the lower end non-test sections of the drainage drilling hole and the monitoring drilling hole are fixed with cement slurry.
In step 2, the flow measuring device is a triangular weir.
In step 4, when the water-proof effect of the water-proof capsule is tested, if the underground drainage pipeline valve is opened, water does not flow out, the water-proof effect is good, otherwise, the water-proof capsule needs to be continuously pressurized until the water stops flowing out.
The beneficial effects of the invention are as follows: the invention adopts a layered water discharge test method and is matched with a complete set of tools to replace the current general water pumping test method, thereby overcoming the defects that the water pumping test is limited by conditions such as the bore diameter, the measuring section position and length, the water pump characteristic, the rock stratum burial depth and the like, the water level of the rock stratum to be tested of the water pumping hole can not be reduced to the minimum, and the measured hydrogeological parameters under different conditions can generate larger difference.
Drawings
FIG. 1 is a process schematic diagram of a multi-aquifer layered drainage test method for straight-through drainage drilling;
in the figure, a high-pressure gas cylinder 1, a ground surface 2, a loose layer 3, a first water-bearing stratum 4, a first water-proof stratum 5, a second water-bearing stratum 6, a second water-proof stratum 7, a water-proof capsule 8, a third water-proof stratum 9, a third water-proof stratum 10, a roadway 11, a roadway bottom plate 12, a stop valve 13, a triangular weir 14 and a pressure gauge 15.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
Example 1
The invention discloses a multi-aquifer layered water drainage test method for a through water drainage borehole, which is implemented according to the following steps:
step 1, selecting a proper position from the ground to perform test drilling to a downhole construction group, wherein the test drilling comprises water drainage drilling and monitoring drilling, the upper parts of the two drilling holes are sleeved with a pipe and are fixed with cement slurry, the test sections (namely the middle sections) of the two drilling holes are protected by a small-diameter water filtering pipe, and the lower end non-test sections of the two drilling holes are fixed with cement slurry;
step 2, adopting underground roadway construction to reveal the bottoms of all holes, respectively installing an underground sewer pipe, installing a stop valve, a pressure gauge and a flow measuring device on the underground sewer pipe, closing all valves of the underground sewer pipe with drilled holes, and measuring the original water pressure from the pressure gauge;
and hoisting the water-proof air bags at the openings of the holes by adopting a crane, and connecting a nitrogen high-pressure air bottle to supply air for the air bags.
The flow measuring device is used for measuring the flow by utilizing the triangular weir;
step 3, opening a valve of a drainage borehole underground drainage pipeline, synchronously measuring the change of the drainage volume of the borehole and the change of the water pressure of the monitoring borehole until the drainage volume of the drainage borehole is stable, and recording the drainage volume and the water pressure of the drainage borehole and the monitoring borehole, wherein the sum of the drainage volumes of the two boreholes is the total drainage volume and is used as the stratum total aquifer parameter test data of a complete drainage test;
step 4, a water-proof capsule is put into the water-proof drill hole to the bottom of the test section, the water-proof capsule is pressurized, the water quantity of the upper water-bearing layer is blocked from being leaked, and the water-proof effect of the water-proof capsule is tested; if the valve is opened, water does not flow out, the water insulation effect is good, otherwise, the pressurization is continued until the water stops flowing out;
step 5, lifting the water-proof capsule to the previous water-proof layer after pressure relief, pressurizing and isolating water, recording the water-release amount and monitoring the water pressure of the drilling hole after the water-release amount of the water-release drilling hole is stable, and taking the water-release amount and the monitoring water pressure of the drilling hole as water-bearing layer parameter test data of the water-bearing stratum below;
and 6, repeating the operation in the step 5 until the hydrogeological parameter test of the uppermost aquifer of the test section is completed, and obtaining the water discharge quantity of the stratum of each test section and monitoring the water pressure of the drilling hole.
According to the method, the water drainage quantity and the water pressure of each stratum of the test section are collected to obtain the hydrologic relationship among layers and the relationship between each layer and the whole water-bearing stratum, so that the water-rich property and the replenishment property of the sheet area are further obtained.
Example 2
As shown in fig. 1, two test boreholes are constructed from proper positions on the ground 2 to appointed positions near a shaft bottom parking lot, and a small-diameter drainage pipe is adopted in a sandstone section (i.e. a test section) of the lohe group by using a casing wall. After the underground construction measure roadway reveals drilling, installing a corresponding pressure gauge 15 and a stop valve 13, and installing a triangular weir 14 on the roadway bottom plate 12;
the method comprises the steps of sequentially arranging a loose layer 3, a first water-bearing stratum 4, a first water-proof stratum 5, a second water-bearing stratum 6, a second water-proof stratum 7, a third water-bearing stratum 9, a third water-proof stratum 10 and a roadway 11 below the ground, hoisting a water-proof air bag 8 to the second water-proof stratum 7 at a ground orifice by adopting a crane, connecting a high-pressure air bottle 1 containing nitrogen to supply air to the air bag, dividing a stratum of a test section into a plurality of sections, respectively measuring water quantity and water pressure after the air bag is inflated, and repeating the steps until the test of the hydrogeological parameters of the uppermost water-bearing stratum of the test section is completed.
Example 3
Through a layered water drainage test, the capsule is initially placed at the bottom of a chalky aquifer, 6 points of a ZX-2 drilling Roche group bedrock section are sequentially tested upwards, the water drainage quantity is observed in a down-hole measure roadway, the test result shows that the water inflow of the chalky aquifer is obvious, the water inflow is large, but the water inflow of the pipe section from bottom to top is small in amplification, and the water chemistry and drilling peeping are combined, so that the water inflow of the megaloblastic sandstone aquifer is mainly in the middle lower part.
The conventional pumping test is to pump water from one drilling hole, measure water level from other drilling holes, pump water according to the collected certain water amount to form a funnel-shaped water level line, calculate the permeability coefficient of the aquifer by using a formula and calculate other hydrogeological parameters. If multiple aquifers or huge aquifers need to be layered for pumping test, a method of installing a submersible pump for pumping is adopted for upper and lower isolation of double packers.
The layering water discharge test can intuitively acquire corresponding hydrogeologic parameters, and overcomes the defects that the water pumping test is limited by conditions such as the bore diameter, the measured section position and length, the water pump characteristic, the stratum burial depth and the like, the water level of the stratum to be measured of the water pumping hole cannot be reduced to the minimum, and the hydrogeologic parameters measured under different conditions can have larger difference.
Claims (5)
1. The multi-aquifer layered water drainage test method for the through water drainage drilling is characterized by comprising the following steps of: performing test drilling on an underground construction group, including water drainage drilling and monitoring drilling, adopting underground roadway construction to expose the bottoms of all holes, installing an underground water drainage pipeline, installing a stop valve, a pressure gauge and a flow measuring device, closing the valve, and measuring the original water pressure from the pressure gauge; opening a valve of a drainage pipeline in a drainage drilling well, measuring the change of the drainage water quantity of the hole and the change of the water pressure of a monitoring drilling hole, recording the drainage water quantity and the water pressure of the drainage drilling hole and the monitoring drilling hole after the water quantity is stable, putting a water-proof capsule into the drainage drilling hole to the bottom of a test section, pressurizing the water-proof capsule, and testing the water-proof effect of the water-proof capsule; lifting the water-proof capsule to the previous water-proof layer after pressure release, and pressurizing water-proof, so as to be used as water-bearing layer parameter test data of the water-bearing stratum below; and repeating the operation until the hydrogeological parameter test of the uppermost aquifer of the test section is completed.
2. The method for the through drainage borehole multi-aquifer layered drainage test according to claim 1, which is characterized by comprising the following steps:
step 1, selecting a proper position from the ground to perform test drilling to a downhole construction group, wherein the test drilling comprises water drainage drilling and monitoring drilling;
step 2, adopting underground roadway construction to reveal the bottoms of all holes, respectively installing an underground sewer pipe, installing a stop valve, a pressure gauge and a flow measuring device on the underground sewer pipe, closing all valves of the underground sewer pipe with drilled holes, and measuring the original water pressure from the pressure gauge; hoisting a water-proof air bag at the orifice of each hole, and connecting a nitrogen high-pressure air bottle;
step 3, opening a valve of a drainage borehole underground drainage pipeline, synchronously measuring the change of the drainage volume of the borehole and the change of the water pressure of the monitoring borehole until the drainage volume of the drainage borehole is stable, and recording the drainage volume and the water pressure of the drainage borehole and the monitoring borehole, wherein the sum of the drainage volumes of the two boreholes is the total drainage volume and is used as the stratum total aquifer parameter test data of a complete drainage test;
step 4, a water-proof capsule is put into the water-proof drill hole to the bottom of the test section, the water-proof capsule is pressurized, the water quantity of the upper water-bearing layer is blocked from being leaked, and the water-proof effect of the water-proof capsule is tested;
step 5, lifting the water-proof capsule to the previous water-proof layer after pressure relief, pressurizing and isolating water, recording the water-release amount and monitoring the water pressure of the drilling hole after the water-release amount of the water-release drilling hole is stable, and taking the water-release amount and the monitoring water pressure of the drilling hole as water-bearing layer parameter test data of the water-bearing stratum below;
and 6, repeating the operation in the step 5 until the hydrogeological parameter test of the uppermost aquifer of the test section is completed, and obtaining the water discharge quantity of the stratum of each test section and monitoring the water pressure of the drilling hole.
3. The method for multi-aquifer layered drainage test of through drainage drillings according to claim 2, wherein in the step 1, the upper parts of the drainage drillings and the monitoring drillings are sleeved and the cement slurry is used for pipe fixing, the test sections of the drainage drillings and the monitoring drillings are small-diameter drainage flowtube protection holes, and the lower non-test sections of the drainage drillings and the monitoring drillings are cement slurry for pipe fixing.
4. The method for testing the multi-aquifer layered drainage through drainage drilling according to claim 2, wherein in the step 2, the flow measuring device is a triangular weir.
5. The method according to claim 2, wherein in the step 4, when the water-proof effect of the water-proof capsule is tested, if the underground water-proof pipeline valve is opened, the water is not flowed out, the water-proof effect is good, otherwise, the pressurization is continued until the water stops flowing out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311674685.3A CN117703506A (en) | 2023-12-08 | 2023-12-08 | Multi-aquifer layered drainage test method for straight-through drainage drilling |
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| CN202311674685.3A CN117703506A (en) | 2023-12-08 | 2023-12-08 | Multi-aquifer layered drainage test method for straight-through drainage drilling |
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