Estimation of the volume of trapped gas and the use of sidetracking as a method of its additional recovery using hydrodynamic modeling in the tNavigator software product

Abstract

The problem of extracting trapped gas from flooded gas deposits has become increasingly important over the past decades. At the end of the development of gas fields, the problem arises of low-pressure gas remaining in the reservoir, which, due to a number of geophysical and geological factors, can be trapped. Removing trapped gas becomes a difficult and costly process. The article considers the process of gas entrapment in the reservoir as a result of the introduction of bottom water into the deposit of one of the real fields in Western Siberia. An algorithm for calculating the volumes of trapped gas is described. The trapped gas volume was estimated using a hydrodynamic model in the tNavigator software product. The dependence of the trapped gas volumes on the cell sizes in the model is estimated.