CN201817854U - High-water-yield water well in thin aquifer - Google Patents

Abstract

The utility model relates to a water well with high water yield in a thin aquifer, which relates to a water well. The purpose of the utility model is to provide a water well with a simple structure and a large water yield in thin and fine aquifers. The water well with high water yield in the thin aquifer of the utility model includes a well hole and a well pipe, the well pipe is placed in the well hole, and a water filter pipe part is arranged on the well pipe, and the water filter pipe corresponds to the position of the thin aquifer, Filter material is filled between the well hole and the well pipe, wherein the wall of the well hole at the thin aquifer forms an outward depression, and the depression is filled with filter material.

Description

High yield wells in thin aquifers

technical field

The utility model relates to a water well, in particular to a water well used for increasing water yield in a thin aquifer.

Background technique

For some Quaternary impermeable formations within 50m, the aquifer has a thinner grain size, usually the aquifer is silty sand or fine sand, the thickness is less than 5m, and the water-rich property is poor. In such areas, using common well types and conventional construction techniques, the thickness of the filter material is small (usually less than 0.2m), and the particle size of the filter material is small. As the water flows into the well, it is resisted by the fine particles in the aquifer and the mud skin on the hole wall, resulting in a decrease in the water output of the well. The hydraulic jump in the well is relatively large, and some hydraulic jumps reach several meters or even more than ten meters. Long-term operation Finally, the fine particles in the aquifer will clog the well wall, causing the well to be easily scrapped.

Utility model content

The technical problem to be solved by the utility model is to provide a water well with a simple structure and a large water yield in the thin aquifer.

The water well with high water yield in the thin and fine aquifer of the utility model includes a well hole and a well pipe, the well pipe is placed in the well hole, and a water filter pipe part is arranged on the well pipe, and the water filter pipe corresponds to the position of the thin and thin aquifer , the wellbore and the well pipe are filled with filter material, wherein the wellbore wall at the thin aquifer forms an outward depression, and the depression is filled with filter material.

The water well with high water yield in the thin and fine aquifer of the utility model, wherein the particle diameter of the filter material particles is determined according to the following formula:

D ₅₀ = Md ₅₀

In the formula: D ₅₀ , d ₅₀ - particle size (mm) when the accumulative weight of filter material and aquifer sand sample sieved is 50%; M - multiplier coefficient, which is about 20-40, and the filling thickness of filter material is not less than 250mm.

The utility model relates to a water well with a high water yield in a thin aquifer, wherein the well pipe is selected from a reinforced concrete well pipe, a steel well pipe, a cast iron well pipe or a plastic well pipe.

The utility model relates to a high water yield water well in a thin aquifer, wherein the diameter of the well pipe is not less than 300mm and not more than 600mm.

The utility model relates to a water well with a high water yield in a thin aquifer, wherein the filter pipe part is in the form of a non-wrapped perforated filter.

The difference between the high water yield water well in the thin aquifer of the utility model and the prior art is that the fine particles around the filter pipe part of the high water yield water well in the thin and fine aquifer of the utility model are replaced by filter materials with larger particle diameters. The thickness of the filter material increases, so that the resistance of the water in the thin aquifer to flow into the well becomes smaller, the water flow can be increased by more than 30%, and the hydraulic jump in the well is reduced to below 0.5m.

Below in conjunction with accompanying drawing, the high water yield water well in the thin and fine aquifer of the present utility model is further described.

Description of drawings

Fig. 1 is the structural representation of the high water yield water well in the thin aquifer of the present invention;

Fig. 2 is the schematic diagram of the well forming process of the high water yield water well in the thin and fine aquifer of the present invention;

Fig. 3 is a schematic diagram of a well washing device in the well forming process of a high water yield well in a thin aquifer of the present invention.

Detailed ways

As shown in Figure 1, the high water yield water well in the thin and thin aquifer of the present utility model comprises a well hole 5 and a well pipe 3, and the well pipe 3 selects a reinforced concrete well pipe, a steel well pipe, a cast iron well pipe or a plastic well pipe, and the well pipe 3. The diameter is not less than 300 mm, not more than 600 mm. The well pipe 3 is placed in the well hole 5. The well pipe 3 is provided with a water filter pipe 4. The water filter pipe 4 corresponds to the position of the thin aquifer 2. The water filter pipe 4 is made of different Wire wound perforated filter form. A filter material is filled between the well hole 5 and the well pipe 3, and the particle size of the filter material particles is determined according to the following formula:

D ₅₀ = Md ₅₀

In the formula: D ₅₀ , d ₅₀ - particle size (mm) when the accumulative weight of filter material and aquifer sand sample sieved is 50%; M - multiplier coefficient, which is about 20-40, and the filling thickness of filter material is not less than 250mm. The wall of the well hole at the thin water-bearing layer 2 forms an outward depression 10, and the depression 10 is filled with filter material.

As shown in Figure 2, the well-forming process of the high water yield water well in the thin and fine aquifer of the present invention is carried out according to the following steps:

First, reverse circulation drilling is adopted to make the wellbore pass through the aquifer 2 and the impermeable layer 1, and water or mud is added to the wellbore during the drilling process so that the mud density in the wellbore is not greater than 1.06×10 ³ kg/ m ³ , at the same time, the mud drop rate in the wellbore is not greater than 0.1m/h, and the mud water level in the wellbore is more than 2m higher than the static water level of the groundwater, which can not only keep the inner hole of the drill pipe unobstructed, but also prevent the well from collapsing.

The well pipe 3 is placed in the well hole, and the part of the water filter pipe 4 on the well pipe 3 corresponds to the aquifer 2 .

Then, fill the filter material between the well pipe 3 and the well hole for the first time.

Then, the pressure water flushing method is used to wash the well, and the well washing process requires a large drawdown. As shown in Figure 3, the submersible pump 9 is placed at a position no more than 3m away from the bottom of the well, and the distance between the dynamic water level in the well and the bottom of the well is less than 5m, under the effect of water level difference, the water in the aquifer 2 enters the well through the filter pipe 4 at a relatively high infiltration velocity, thereby destroying the mud skin of the hole wall and bringing out the fine particles in the aquifer around the well hole, resulting in filtration A depression 10 is formed between the water pipe 4 part and the hole wall. Fill the filter material between the well pipe 3 and the well hole again, and put a vibrator 6 in the filter material layer to accelerate the filling of the filter material, so that the filter material fills the depression 10, and the vibrator connecting pipe 7 is connected to the ground. A pressure water gun 8 is installed at the submersible pump 9. When fine particles in the aquifer 2 are deposited at the bottom of the well, the pressure water gun 8 is used to disperse the silt, and the submersible pump 9 discharges the silt simultaneously. Repeatedly restore the water level several times, and then start the pump to pump water after the water level returns to the original static water level until the filter material is stable and no longer sinks.

Finally, the orifice is sealed with clay after the well cleaning is complete.

The above-mentioned embodiments are only described to the preferred implementation of the utility model, and are not limited to the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (5)

1. A high water yield water well in a thin and fine aquifer, comprising a well hole (5) and a well pipe (3), the well pipe (3) is placed in the well hole (5), and the well pipe (3) is provided with The water filter pipe (4) part, the water filter pipe (4) corresponds to the position of the thin aquifer (2), and the filter material is filled between the well hole (5) and the well pipe (3), and it is characterized in that: The wall of the well hole at the thin water-bearing layer (2) forms an outward depression (10), and the depression (10) is filled with filter material. 2. the high water yield water well in the thin and fine aquifer according to claim 1, is characterized in that: the particle diameter of described filter material particle is determined according to the following formula: D ₅₀ = Md ₅₀ In the formula: D ₅₀ , d ₅₀ - particle size (mm) when the accumulative weight of filter material and aquifer sand sample sieved is 50%; M - multiplier coefficient, which is about 20-40, and the filling thickness of filter material is not less than 250mm. 3. The well with high water yield in the thin aquifer according to claim 2, characterized in that: the well pipe (3) is selected from reinforced concrete well pipe, steel well pipe, cast iron well pipe or plastic well pipe. 4. The water well with high water yield in thin and fine aquifers according to claim 3, characterized in that: the diameter of the well pipe (3) is not less than 300mm and not more than 600mm. 5. The water well with high water yield in the thin aquifer according to claim 4, characterized in that: the filter pipe (4) is in the form of a non-wrapped perforated filter.

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