In country houses, a well is almost the only way to provide a home with water. But if we compare them with the central water supply, in the case of wells, the owners themselves have to take care of the quality of the water. Sometimes the liquid becomes cloudy there, and sand settles at the bottom. This indicates that it is necessary to flush the well.
Using a submersible pump
A more accurate way of cleaning is technology when a submersible pump is used. You won’t have to work in the mud, because the water can be drained to a convenient place. For the procedure, you will need a pump to pump out dirty water. It must have the ability to suck up solid particles up to 5 mm. Then it will be possible to remove not only sand from the bottom, but also fine-grained pebbles.
Work methodology
Flushing the well begins with tying the pump to the cable. At workequipment may be sucked into sludge. A cord is supplied with the unit, which does not always help to pull the device out. The unit sinks to the bottom and rises twice to raise the sediment. Then the pump is installed near the bottom and turned on.
If the unit provides for the presence of automation, it will turn itself off as soon as all the water is pumped out. In the absence of such an option, it will be necessary to control the entire process in order to understand when the pumping is over, because a dry-running motor can burn out. Flushing the well in the absence of a pump for dirty water can be carried out with a vibration pump of the "Kid" type. The manipulations will be the same as described above.
Flush calculation
The flow rate of the flushing fluid should be determined taking into account the removal of cuttings in the gap between the well and the pipes. The pump is selected according to the largest pressure loss in the system. The volume of fluid flow, which is denoted by the letter Q, will be determined by the formula: Q \u003d P / 4(D2- - d2)W kp { m3/s}. In it, the letter D denotes the diameter of the wellbore. The letter d in the formula denotes the diameter of the drill pipes. W kp - fluid flow velocity in the annular gap.
This expense must meet certain requirements. For example, the hydrodynamic pressure should be less than the fracturing pressure. But when drilling rocks that are prone to screes and collapses, it is necessary to ensure a laminar regime in this interval.
After calculationwell flushing, the fluid flow rate should be specified when choosing the type of hydraulic downhole motor and turbogenerator of the system. At the same time, the conditions for cleaning and preventing the absorption of liquid by the rock formation should be met.
Cleaning
Flushing the well after drilling is necessary for the reason that debris, in addition to water, also gets inside. Installed filters are not able to retain small particles that make the water cloudy. To flush the well with your own hands, at the first stage it is necessary to insert pipes into the well. The top is fastened with a rope, because under great pressure the structure can be pushed out.
A vacuum adapter is put on the pipe and fastened with self-tapping screws. The compressor is pumped up to the desired pressure. It is necessary to put on the compressor hose on the adapter and turn on the unit. All air is released into the well. This pumping should be repeated several times.
Chemical cleaning
If flushing and blowing methods only slightly increased the flow rate of the well, the filters are clogged with deposits of lime and iron s alts. It will not be possible to knock them out with pressure. In this case, you can resort to the use of acids. The bottom is filled with battery acid, which is used for vehicles. The pump should first pump out water.
The acid is left inside for two days, while the top of the well should be plugged. Such flushing of wells for water involves pumping water several times. Even after that, for a month, the liquid should notuse for drinking and cooking. It can only be used for household or construction needs. The more often you draw water, the faster the acids will wash out. Before using water, it is necessary to hand it over to the laboratory for analysis. This will give you an official safety confirmation.
Flushing with two pumps
This technology provides for the immersion of one pump into the well with the help of a cable. It is suspended 60 cm from the deposits. An injection hose is lowered into the tank, the second hose is lowered from the tank. The bucket should be equipped with centrifugal pump No. 2 and immersed in the tank.
When flushing a well in the next stage, two pumps are activated at once. The hose in the well should be rocked in different directions to wash out the deposits. Such washing should be carried out until the water is clear. In this case, you should focus on a more powerful pump. It is stopped from time to time to maintain the optimal water level in the tank.
Why you should use two pumps
This technique is good because washing is better and faster. There is less load on the submersible pump. The area around the well is not polluted, and the manipulations themselves do not require a large amount of water. But this method also has its drawbacks. They are expressed in the constant presence of a person during washing. The operator must control the operation of the pumps and turn off the more powerful one from time to time.
In conclusion
Owners of suburban real estate sooner or later face the need to drill a well on the site. It is impossible to organize a water supply system in a different way. This event is responsible, but it is accompanied by the need to clean the well.
