A highly effective method of preventing the entry of sand from the reservoir into the well is the use of gravel filters, which are used in Ukraine and abroad. The types of gravel filters, the conditions for their use, the choice of the diameter of gravel grains for creating a gravel filter are presented. Varieties of installation of gravel filters depending on the geological conditions of the reservoir are considered. To assess the effect of the thickness and permeability of a gravel pack on the productive characteristics of a gas well, a calculation was performed using the PipeSim software package. A nodal analysis of the operation of a gas well with a gravel pack for filter-frame diameters of 0.0603 m and 0.073 m is given. Based on the results of the studies, graphical dependences of gas flow rates in the presence of a gravel pack on the permeability of a gravel pack at its different thicknesses are plotted and analyzed. It is established that the gas flow rate increases with an increase in the thickness and permeability of the gravel pack. According to the results of statistical processing of calculated data using the least squares method, the optimal values of gravel pack permeability were determined, above which the gas flow rate practically does not change. According to the results of the studies performed, a rational value of the gravel pack permeability was established, which is 175 mD (3.5 times more than the permeability coefficient of the reservoir). When studying the influence of the nature of the opening of a productive formation on the flow rate of a gas well with a gravel filter, it was found that with an increase in the number of perforations and their diameter, the flow rate of a gas well with a gravel filter increases. Based on the results obtained, the optimal value of the number of perforations per linear meter of the perforated production string and their diameter was established, which is 20 and 11 mm, respectively. Above these studied parameters, the flow rate of gas wells with a gravel pack does not change significantly
Received 13.10.2022
Revised 26.01.2023
Accepted 27.02.2023
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