The results of the application of the ZetaGel technology at the fields of TPE «Kogalymneftegaz»

Abstract

At present the hydraulic fracturing of formation is the main type of the geological and technical measures in the oilfields of western Siberia. In 2019-2020 the hydrofracturing of formation’s share was 48.6%. The widespread use of hydrofracturing is due to its main advantage - an instant increase in well production, as a result of increasing the permeability of the bottomhole formation zone by several orders. However, water, as a more mobile agent, is ahead of oil and occupies the most permeable channels first, which, as a result, leads to intensive watering of wells. This fact is the main disadvantage of hydrofracturing. The extensive use of this production stimulation’s method and the number of its negative consequences are the cause of the relevance for the hydrofracturing’s technology improvements. The article describes one of the latest and most promising ways to improve its efficiency - the ZetaGel technology consisting of the surface-active agents’ adding to the breakdown agent for further formation of the polymer-free gel system, explores the process of solution preparation, studies its physicochemical properties, and analyzes the geological and field data on the application of ZetaGel technology at the fields of TPE «Kogalymneftegaz» and the advantages of this technology in comparison with the standard operation of hydraulic fracturing. In addition, the authors of the article proposed recommendations for the further use of this system. The use of cross-linked gel has solved the problems related to the bottom water’s breaches, the pore canals’ bridging by the proppant and the damages of the critical area of formation and the edge. The rheological properties of the liquid in turn allow keeping the proppant in suspension and pushing it deep into the formation, thereby increasing the permeability of the proppant pack.