Drilling Challenges Geological and Formation-Related ChallengesHigh-Pressure, High-Temperature (HPHT) FormationsSalt Drilling ChallengesLost Circulation in Drilling OperationsManaging Unstable Shale Formations in Oil and Gas DrillingOffshore Geo-Hazards: Recognition and Mitigation -A Practical Guide for Drilling ProfessionalsBit Balling in Drilling Operations: Recognition and Mitigation