Geological and technological prerequisites for mass water occurrence in gas wells of the Orenburg oil and gas condensate field

Background. In the absence of a geologically sound mechanism for the introduction of water into a gas reservoir and a confident a priori localization of potential flood zones, the adaptation of hydrodynamic models has to be carried out based only on borehole data, which entails a high degree of uncertainty, and therefore high prognostic risks. Objective. Reduction of prognostic risks when choosing a pilot production site to increase the component recovery of a field (including by extracting the “matrix” oil of its gas part). Materials and methods. Analysis of the geological and technological prerequisites for massive premature (compared with early design documents) water occurrence in gas wells of the Orenburg oil and gas condensate field from the perspective of modern geodynamic processes developing in a carbonate reservoir with a high degree of bituminosity, principle hydrodynamic modeling. Results. Understanding the geological diversity of the mechanisms leading to water occurrences in the gas wells of the Orenburg oil and gas condensate field makes it possible to create a set of fundamental hydrodynamic models for various reservoir sites. This reduces the uncertainty in the identification of remaining locally trapped gas volumes and the level of risk in the event of an improper selection of a site pilot production for increasing the component recovery. Conclusions. It is assumed that various mechanisms of well flooding were triggered by the attempts to create a gas condensate storage by an explosive method on the eve of development, at the stage of oil and gas condensate field development, in the Kungur salts of the caprock of the Central Dome.