CN110593859B - Method for checking layered water stopping effect of underground water monitoring well - Google Patents
Method for checking layered water stopping effect of underground water monitoring well Download PDFInfo
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- CN110593859B CN110593859B CN201910988579.XA CN201910988579A CN110593859B CN 110593859 B CN110593859 B CN 110593859B CN 201910988579 A CN201910988579 A CN 201910988579A CN 110593859 B CN110593859 B CN 110593859B
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention relates to a method for checking the layered water stopping effect of a groundwater monitoring well, which comprises the following steps: pumping test; the pumping test synchronously measures the water level of each layered monitoring well; 1 water sample is respectively adopted for carrying out full analysis on water quality 5-10 minutes after the pumping test starts, when the dynamic water level tends to be stable and before the pumping test ends; if the layered water level is unchanged and the water quality results of the 3 water samples are basically consistent, judging that the water stopping effect is good; otherwise, the water stopping effect is judged to be bad. The problems of failure of a monitoring well and channeling of water in different water-bearing layers caused by poor water stop of the monitoring well in the background art are solved, and the problems of poor water stop of the monitoring well in a layering way are solved before operation.
Description
Technical Field
The invention belongs to the field of inspection of layered water stopping effects of underground water monitoring wells, and particularly relates to a method for inspecting layered water stopping effects of underground water monitoring wells.
Background
The disclosure of this background section is only intended to increase the 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 already known to those of ordinary skill in the art.
Groundwater is not only an important water supply source for urban and rural life and industrial and agricultural water in China, but also an important component of a natural ecological system and environment. For scientific and reasonable development, utilization and protection of groundwater resources and ecological environment, the dynamic monitoring work of groundwater needs to be enhanced. The construction of groundwater monitoring well is the important basis of carrying out groundwater dynamic monitoring, and the well quality of monitoring well has direct influence to monitoring result, and especially monitoring well stagnant water effect is not good, leads to different aquifer to scurry the layer, and monitoring well just loses its value and monitoring's meaning, not only can cause economic loss, and more serious probably can cause scurry layer pollution problem.
Disclosure of Invention
In order to overcome the problems, the invention provides a method for checking the layered water stopping effect of a groundwater monitoring well, so as to solve the problems of failure of the monitoring well and channeling of water in different aquifers caused by poor water stopping of the monitoring well in the background art, and solve the problems of poor layered water stopping of the monitoring well before operation.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method of verifying a stratified water stopping effect of a groundwater monitoring well, comprising:
pumping test;
the pumping test synchronously measures the water level of each layered monitoring well;
1 water sample is respectively adopted for carrying out full analysis on water quality 5-10 minutes after the pumping test starts, when the dynamic water level tends to be stable and before the pumping test ends;
if the layered water level is unchanged and the water quality results of the 3 water samples are basically consistent, judging that the water stopping effect is good; otherwise, the water stopping effect is judged to be bad.
The existing pumping test aims at acquiring relevant parameters and data of an aquifer, is used for evaluating the water enrichment of the aquifer, and is insufficient for judging the monitoring of the pumping of the aquifer by knowing the water chemical characteristics of the aquifer and the like; the purpose of the water pumping test of the application is to obtain the test data, and meanwhile, the deeper purpose is to test the water stopping effect of the aquifer, and the water stopping effect of the water pumping hole and the source of water channeling are judged by synchronous observation of the water level of the observation hole and alternate sampling and test comparison of the water sample in the water pumping process, and then remedial measures can be directly taken for the water channeling position without carrying out full-hole water stopping again, so that a great amount of time and cost can be saved.
According to the method for verifying the layered water stopping effect of the underground water monitoring well, through continuous exploration and experience summarization in the well formation process of the monitoring well, the source of the layer channeling water can be effectively judged, targeted remedial measures can be carried out on the layer channeling position, and the water stopping problem of the monitoring well is eliminated before monitoring operation. In some embodiments, in the pumping test, the water yield is considered to be stable when the difference of the water yield changes is less than 5% of the average water yield in a plurality of continuous hours, so as to ensure accurate and efficient monitoring.
In the application, when the dynamic water level tends to be stable, the water level observation is performed at intervals of half an hour, and the error is not more than +/-2 cm.
The term "before the pumping test is finished" in the present application means the stable time required for the pumping test to reach the specification.
In some embodiments, when using a centrifugal or deep well pump, the water level is measured three times in succession, each time at half an hour intervals, with an error of no more than + -2 cm, at which point the water level is considered to be stable.
In some embodiments, when using an air compressor, the water level is measured three times in succession, each time spaced a half an hour apart, with an error of no more than + -10 cm, i.e. the water level is considered to have stabilized.
In some embodiments, the water level observation error should not exceed ±1 cm to obtain a good observation accuracy.
In some embodiments, the observation of water level and water yield is performed once every 5 minutes at the beginning of the pumping test, and after 30 minutes, the observation is performed once every 30 minutes, so as to improve the accuracy of the observation and the accuracy of the monitoring.
In some embodiments, the water quality total analysis comprises physical, chemical and bacterial analysis, and the change condition of the water quality can be accurately measured through the monitoring of three aspects of data.
In some embodiments, the water level of the water pumping test is lowered no less than twice to accurately calculate the unit water output and the maximum water output of the well.
In some embodiments, the water level of the pumping test is reduced three times, which is more beneficial to drawing a curve and calculating the water yield.
In some embodiments, the water pumping test also observes stationary water level, dynamic water level and recovery water level, water temperature and air temperature, water yield, sand content in the water, and water quality changes during the pumping period. To accurately monitor various aspects of groundwater.
The invention has the beneficial effects that:
(1) The water pumping test and the water quality sample collection and the analysis test are carried out to check the layered water stopping effect when the monitoring well is completed, meanwhile, the water quality test data and the water level dynamic state of the observation hole are compared, the source of the water channeling is judged, the targeted remedy measures can be carried out on the water channeling position, the water stopping bad problem of the monitoring well is eliminated before the monitoring operation, the quality and the practical service life of the monitoring well are greatly improved, and the water channeling problem caused by the water stopping bad is avoided. The technical method is applied to the underground water layer monitoring well formation process of the unit construction of me, and good effects are obtained.
(2) The operation method is simple, high in accuracy, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
Fig. 1 is a flow chart of the operation of the present invention.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. 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 application 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 example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As introduced by the background technology, the method aims at solving the problem that the water stopping effect of the existing monitoring well is poor, so that different aquifers are channeling. Therefore, the invention provides a method for checking the layered water stopping effect of the underground water monitoring well, which comprises the steps of pumping test, water level measurement, water sample collection and water quality full analysis.
The water level measurement is to synchronously measure each layered monitoring well during a pumping test; the sample collection and analysis test is to collect 1 water sample for full analysis respectively after the pumping test starts for 5-10 minutes, when the dynamic water level tends to be stable (the water level is observed at intervals of half an hour, the error is not more than +/-2 cm) and before the pumping test ends (the pumping test reaches the stable time required by the specification).
Preferably, the water level measurement is a simultaneous measurement of each of the layered monitoring wells.
Preferably, the sample collection and analysis test is to collect a water quality sample for full analysis test after 5-10 minutes after the pumping test starts and after the dynamic water level tends to be stable and before the pumping test ends.
The technical scheme of the present application is described below by means of specific examples.
Example 1:
the technical scheme is applied to the effect inspection of the underground water monitoring Kong Zhishui of the ground subsidence investigation monitoring project in Jinan city, the water level of the shallow water monitoring hole is synchronously observed and recorded in the water pumping test process of the deep water monitoring hole, and after the test starts, the water level is reduced and stabilized at 10 minutes, and 30 minutes before the water pumping test is finished, water quality full analysis samples are respectively taken for the water pumping hole, and the water quality full analysis samples are timely sealed and sent to a laboratory for test analysis. The water level of the shallow water is found to slightly fluctuate in the water pumping test process (because a plurality of shallow water agricultural wells exist around the monitoring hole), so that the fluctuation of the water level of the shallow water monitoring hole cannot be eliminated, the water level of the deep water is caused by water pumping of the deep water monitoring hole, the water quality of the deep water is found to have larger change than the water quality of the water just after the well is formed through analyzing the water quality sampled in the water pumping process, the anion and cation content and the water quality of the deep water are increased just after the well are increased, and the mineralization content of the shallow water is also increased by 200 mg/L (the mineralization degree of the shallow water is far higher than that of the deep water); and comparing water samples taken after the water pumping test starts and before the water level is stable with water samples taken before the test ends, finding out unstable water quality, comprehensively observing the water level, comprehensively judging that deep water is communicated with shallow water, and indicating that the two monitoring wells have poor water stopping effect. And in the later stage, the shallow water part at the upper part of the deep monitoring well is subjected to targeted water stopping according to the detection result, and pumping water is again verified, so that the water stopping purpose is achieved, and the normal operation of the monitoring well is ensured.
Therefore, the method is feasible and achieves better effect.
Example 2:
a method for checking the layered water stopping effect of underground water monitoring well includes pumping test, water level measurement, water sample collection and water quality full analysis. The water level measurement is to synchronously measure each layered monitoring well during a pumping test; the sample collection and analysis test is to collect 1 water sample for full analysis of water quality after the water pumping test starts for 5-10 minutes, when the dynamic water level tends to be stable and before the water pumping test ends.
Example 3
A method for checking the layered water stopping effect of underground water monitoring well includes pumping test, water level measurement, water sample collection and water quality full analysis. The water level measurement is to synchronously measure each layered monitoring well during a pumping test; the sample collection and analysis test is to collect 1 water sample for full analysis of water quality after the water pumping test starts for 5-10 minutes, when the dynamic water level tends to be stable and before the water pumping test ends.
The water level measurement is synchronous measurement for each layered monitoring well.
Example 4
A method for checking the layered water stopping effect of underground water monitoring well includes pumping test, water level measurement, water sample collection and water quality full analysis. The water level measurement is to synchronously measure each layered monitoring well during a pumping test; the sample collection and analysis test is to collect 1 water sample for full analysis of water quality after the water pumping test starts for 5-10 minutes, when the dynamic water level tends to be stable and before the water pumping test ends.
The sample collection and analysis test is to collect a water quality sample for full analysis test after 5-10 minutes after the pumping test starts and after the dynamic water level tends to be stable and before the pumping test ends.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, but may be modified or substituted for some of them by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. While the foregoing describes the embodiments of the present invention, it should be understood that the present invention is not limited to the embodiments, and that various modifications and changes can be made by those skilled in the art without any inventive effort.
Claims (9)
1. A method of verifying the stratified water stopping effect of a groundwater monitoring well, comprising:
pumping test;
the pumping test synchronously measures the water level of each layered monitoring well;
1 water sample is respectively adopted for carrying out full analysis on water quality 5-10 minutes after the pumping test starts, when the dynamic water level tends to be stable and before the pumping test ends;
if the layered water level is unchanged and the water quality results of the 3 water samples are basically consistent, judging that the water stopping effect is good; otherwise, judging that the water stopping effect is bad;
the water quality total analysis comprises physical, chemical and bacterial analysis, including analysis of anion and cation content and mineralization content;
the water pumping test aims at checking the water stopping effect of the aquifer, judging the water stopping effect of the water pumping hole and the source of water channeling through synchronous observation of the water level of the observation hole and alternate sampling, test and comparison of water samples in the water pumping process, and then directly taking remedial measures for the water channeling position without carrying out full-hole re-water stopping;
the method for judging the source of the channeling water comprises the following steps:
(1) When the layered water level fluctuates along with the pumping hole, a plurality of shallow water agricultural wells exist around the monitoring hole;
(2) Through the analysis of the sampled water quality in the water pumping process, the water quality of deep water is found to have larger change than the water quality when the well is just formed, the content of anions and cations is increased than when the well is just formed, and the mineralization content is also increased;
(3) And (3) comprehensively judging that the deep water is communicated with the shallow salt water by combining the water level observation in the step (1) and the water quality data change in the step (2), and judging that the source of the channeling water is a shallow salt water part, thereby carrying out targeted water stopping on the part between the upper shallow salt water aquifer of the deep monitoring well and the deep fresh water.
2. The method for checking the stratified water-stopping effect of a groundwater monitoring well according to claim 1, wherein the water yield is considered stable when the difference of the water yield changes is less than 5% of the average water yield in a continuous number of hours in the pumping test.
3. The method for checking the stratified water-stopping effect of a groundwater monitoring well according to claim 2, wherein the water level is continuously measured three times with an interval of half an hour each time with an error of not more than + -2 cm when using a centrifugal water pump or a deep well water pump.
4. The method for checking the stratified water-stopping effect of a groundwater monitoring well according to claim 2, wherein the water level is continuously measured three times with an interval of half an hour each time with an error of not more than + -10 cm when using an air compressor, and the water level is considered to be stable.
5. The method for verifying a stratified water-stopping effect of a groundwater monitoring well according to claim 1, wherein the water level observation error should not exceed ±1 cm.
6. The method for checking the stratified water-stopping effect of a groundwater monitoring well according to claim 1, wherein the observation of water level and water yield is performed every 5 minutes at the beginning of a pumping test, and every 30 minutes after 30 minutes.
7. The method for checking the stratified water stopping effect of a groundwater monitoring well according to claim 1, wherein the number of water level drops in the pumping test is not less than two.
8. The method for testing the stratified water-stopping effect of a groundwater monitoring well according to claim 7, wherein the water level drop number of the pumping test is three.
9. The method for testing the stratified water stopping effect of the underground water monitoring well according to claim 1, wherein the static water level, the dynamic water level and the restored water level, the water temperature and the air temperature, the water yield, the sand content in water and the water quality change in the pumping period are also observed in the pumping test.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108468528A (en) * | 2018-05-18 | 2018-08-31 | 河北省地矿局国土资源勘查中心 | Fourth-series deep well layered water pumping and stopping device and water pumping and stopping method thereof |
| CN108867716A (en) * | 2018-06-12 | 2018-11-23 | 武汉丰达地质工程有限公司 | A kind of connection test method of drawing water of lowering heartn type water-stop curtain |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468528A (en) * | 2018-05-18 | 2018-08-31 | 河北省地矿局国土资源勘查中心 | Fourth-series deep well layered water pumping and stopping device and water pumping and stopping method thereof |
| CN108867716A (en) * | 2018-06-12 | 2018-11-23 | 武汉丰达地质工程有限公司 | A kind of connection test method of drawing water of lowering heartn type water-stop curtain |
Non-Patent Citations (1)
| Title |
|---|
| 多层监测井成井工艺与止水材料研究;王明明;《中国优秀硕士学位论文全文数据库（电子期刊）》;20160131;第4.1-4.2节 * |
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