The Drilling Fundamentals Library details the processes and tools used to drill a well, as well as key concepts like kick detection, underbalance drilling, primary cementing and well control. Drilling wells is perhaps the most challenging and dangerous process in oil and gas exploration and production, and is the first step in exploration and production. Specialized procedures, tools and equipment are required during the process of bringing a well to completion, and knowledge of how these pieces work with each other and their specific role in the creation of a well is essential for efficient and safe drilling operations. Maintaining control of the well during drilling operations is crucial to the safety of crew members, and protection of the environment. The last step of drilling a well is completion, in which specialized casing and well is completion, in which specialized casing and cementing operations allow production of well fluids.