Abstract
In the work, a comparative analysis of the main methods of creating backwash during well drilling was carried out: using a centrifugal pump and using an airlift. A comprehensive research method was used, including a review and synthesis of scientific and patent publications, analytical studies of methods for creating backwash during well drilling. Their advantages and disadvantages are revealed. The greatest attention is paid to drilling of large-diameter wells with backwash, which is widespread in foreign countries in the development of groundwater reserves. The presented materials showed a clear advantage of this method over others, both in terms of the quantity and quality of produced water, and in terms of well operation. It is shown that, under local conditions, the advantages of this method can have a particularly pronounced effect, and its disadvantages will manifest themselves to a minimal extent. The advantages of rotary backflushing over other drilling methods can be considered proven. It will provide a sharp increase in the utilization rate of local groundwater resources, which is the main problem of local groundwater supply. The need for widespread implementation of this method is obvious. The influence of the upward flow rate of the drilling fluid and its density on the maximum depth of drilling with backwash using an airlift has been studied. An improved device of the circulation system for drilling wells with backwash using an airlift has been developed. Thanks to its use, it becomes possible to use commercially available drill pipes with conventional connections. This allows you to increase the drilling speed by reducing the time spent on tripping operations.