This comprehensive book offers an in-depth exploration of the upstream oil and gas value chain, providing essential knowledge on petroleum formation, geology, and reservoir properties. It systematically delves into drilling technology, well logging, and production techniques, with a strong emphasis on Enhanced Oil Recovery (EOR) methods—ranging from conventional approaches to cutting-edge innovations like nanotechnology. The book also addresses operational risk management through Health, Safety, and Environment (HSE) protocols and incorporates computational modeling with a focus on environmental sustainability. Enriched with case studies, detailed diagrams, and industry standards, it serves as a practical and authoritative resource for understanding upstream petroleum technology. Key Features: Explores the entire spectrum of upstream petroleum technology, from exploration and drilling to production optimization. Provides detailed explanations of complex topics, including the latest advancements in drilling technology, well completion methods, and enhanced oil recovery techniques. Discusses cutting-edge methods for accurate reservoir identification and resource evaluation. Demonstrates how to apply reservoir engineering principles, production forecasting models, and EOR techniques to optimize recovery. Guides readers on implementing automation and data-driven processes to streamline production and reduce costs. This book is designed for graduate students and professionals in petroleum and chemical engineering, offering both foundational knowledge and advanced technical insights to support academic learning and industry application.