This five-day comprehensive course is designed to provide in-depth knowledge and practical skills in well test analysis and interpretation for petroleum engineers. It covers key concepts, methodologies, and advanced techniques required to evaluate well performance, determine reservoir properties, and optimize production. The course combines theoretical instruction with hands-on exercises, enabling participants to interpret real well test data and apply their knowledge to complex field scenarios. The first day introduces participants to the fundamentals of rock mechanics and the development of a geomechanical model. The second day focuses on geological aspects and the derivation of geomechanical properties from core and log data, incorporating laboratory measurements and log-based modeling approaches. The third day addresses well construction and completion topics, including wellbore stability during drilling, hydraulic fracturing, and sand production. The fourth day is dedicated to reservoir-related challenges such as water and gas injection, thermal effects, and fractured reservoir characterization. The final day presents selected field case studies, where participants work in groups to discuss different field development and reservoir management strategies and present their conclusions.