Research of the widespread methodologies for forecasting gas deposit development under the gas drive

The determination reliability of development technological indicators plays an important role in the further field development, since they affect the field development rate, the drill footage, the amount of capital investments, the construction of ground communications, etc. Therefore, the choice of the methodology for forecasting technological indicators plays a decisive role in making investment decisions. To forecast the technological indicators of the gas/gas-condensate fields development a significant number of methods have been developed, among which the main ones are the methods of integrating the differential equations of fluids unsteady filtration within a porous medium inhomogeneous in reservoir properties, consistent change in stationary states and the basic laws extrapolation of the actual data dynamics. The above methods are characterized by varying degrees of the calculated values reliability ​​and certain technological limitations. To assess the magnitude of the possiblemargin of error in the design of the hydrocarbon fields development, a study of generally accepted methods that are widely used in the oil and gas industry has been carried out. Based on the study results, it has been found that the Petroleum Experts IPM suite software package provides the highest accuracy and reliability of the predicted development indicators, since it takes into account the reservoir properties, phase transformations of complex reservoir hydrocarbon systems and the regularities of fluid movement along the wellbore. The results of the conducted research allow us to assert that the use of the main tools of hydrodynamic modeling in accordance with the world practice of designing the deve-lopment of hydrocarbon fields will increase the production efficiency of residual hydrocarbon reserves at the final stage of development, which form the main potential for increasing its own production in Ukraine.