Abstract
<jats:p>This article examines the challenges encountered during wellbore workovers in terrigenous reservoirs in Eastern Siberia. It is noted that the use of aqueous solutions for well killing results in a 20–40% reduction in productivity due to wellbore colmatation caused by the interaction of water with anhydrite present in the rock. To address this issue, the use of inverted water-in-oil emulsions is proposed. These emulsions prevent deterioration of reservoir properties and minimize the risk of lost circulation. The article describes in detail the methodology for wellbore colmatation in the B10 formation of the Khamakinsky horizon, methods for preparing emulsions based on commercial oil and brine, and presents calculation methods for achieving the required fluid density. The study results highlight the high efficiency of these emulsions under low reservoir pressures and temperatures and highlight their advantages over traditional aqueous solutions. The article briefly presents information on the geological structure of the B10 layer of the Khamakinsky horizon, as a development object, due to the complex structure and tectonic factors that influence both the choice of approaches to the opening and development of this object, and the selection and adaptation of the killing fluid, taking into account complicating geological and technological factors.</jats:p>