IMPROVING VERTICAL DRAINAGE WELL DESIGN

Abstract

Water intake wells, including vertical drainage wells, are characterized by a decrease in water consumption during operation. To ensure the stable operation of the irrigation and drainage system, repair and restoration work is carried out. Steel pipes and filters are mainly used for the construction of vertical drainage wells in the Syrdarya river basin.

To clean the filter of water intake wells from corrosion and clogging, mechanical, physical, biological and chemical methods are used in practice. Each of them has its own technology, mechanism and equipment. They do not eliminate the repetition process. It is known that polymeric materials are resistant to chemical corrosion. To exclude the corrosion process in the water well, we have successfully completed the construction of two vertical drainage wells in the Chilean region of the Kyzylorda region of the Republic of Kazakhstan, using a polymer filter and a pipe as an experiment. The wells were drilled with a rotary drilling unit with backwash. Pure water (ditch) was used as drilling fluid. A pair of pipes was prepared on the ground, steel rings were put on the pipe from both ends of each section. Their connection in the barrel is made by electric welding. Backfilling in the pipe annulus was performed.

As a mechanical method, an airlift is used to clean the wellbore from mechanical siltation. After completion of installation, construction pumping was performed by a compressor. The results showed that in the initial period of operation, a decline process was observed. In further operation, the well flow rate stabilized. As a result of construction with the use of pipes and filters made of polymer material, the effect was achieved in terms of water volume more than 3 times and in terms of service life 4.2 times compared to a metal filter well.