Analysis of the main factors determining the value of the specific flow rate of a water well

Abstract

Purpose of research – numerical characterization of the main factors affecting the value of the specific flow rate of a water well. The relevance of the study is due to the possibility of using the obtained functional relationships to predict the value of the specific flow rate of a water well. Research methods: interpretation of gamma logging curves of water wells, correlation of its results with the core survey data, interpolation of the obtained values over the section area, processing of hydrodynamic well testing materials, comparison of its results with the data of geophysical research, establishment of statistical relationships between the parameters. The results of the study and their application. It was found that the value of the double difference parameter of natural radioactivity of water-bearing rocks statistically significantly correlated with the value of the clay content of core samples, studied in the laboratory way, as well as with the value of water permeability of rocks determined by hydrodynamic tests wells, which allows using this parameter to characterize the filtration properties of rocks aquifer by the value of their clay content. Significant statistical relationship was obtained between the specific flow rate of the water intake well and water conductivity of water-bearing rocks, the parameter of imperfection of the well by the nature of the formation opening, as well as the parameter, numerically equal to the ratio of the well filter length to the value of the double difference parameter of natural radioactivity of rocks of its installation interval. The presence of statistical uncertainty in the relationships is due to the mutual influence of the parameters. The obtained functional relations can be used in the design of wells. Conclusions. During the study the assumption was confirmed that water intake wells with the longest water intake part, equipped in the least clayey and, accordingly, more water-permeable interval of aquifer have the least value of imperfection by nature of formation opening and are able to provide the highest specific flow rate. Such wells are the most effective in operation.