Sira N. Development and application of integrated geological and geochemical methods for forecasting of inundation of gas-condensate deposits.

Dissertation is dedicated on improvement of methods of diagnosis of inundation of hydrocarbon deposits. To this goal we have analyzed regularities of special distribution of hydrocarbon and non-hydrocarbon components of formation gases from gas-and-condensate fields of Dnieper -Donets basin and studied analytic connections between nitrogen and ethane content of natural gases from gas and condensate wells for all period of their exploration and operation, and the process of inundation. There have been conducted experimental investigation of nitrogen and ethane solubility in formation water under simulated formation conditions; studied changes of phase state and content of gas-and-condensate system throughout the process of formation pressure depletion. Taking laboratory and analytical investigations for basis, we have developed pilot graph-analytical method, forecasting inundation of gas-and-condensate fields in the process of development, using nitrogen, ethane content and bottomhole pressure as indicators. Application of this method allowed predicting inundation of a number of wells.