The article discusses the results of complex field studies of gas wells and reservoirs in order to establish the gas dynamic parameters of the reservoir and well and study their gas condensate characteristics at the Altyguyi field. The main attention in the study of the well and the formation was paid to a more accurate determination of the value of the component composition of the formation gas required for the compilation of differential condensation isotherms, determined by sampling raw condensate. Based on the constructed graphs of differential condensation isotherms for gas condensate systems of 3 wells, the pressure of the beginning of condensate separation from natural gas is determined. Based on the results of the conducted research, the justification for the allocation of operational facilities, their drilling systems, taking into account the need for dual completion (DC) in wells, was carried out.