This manual was compiled for use as the primary text for blowout prevention courses conducted around the world by WCS-Well Control School. Its scope is broad, and recommendations or suggestions of good practices are designed to meet the training requirements established by the International Association of Drilling Contractors (IADC), American Petroleum Institute (API) and other industry and government agencies, as well as to address the knowledge base necessary to competently perform many of the skills required by the International Well Control Forum (IWCF). Additionally, WCS hopes that field personnel will find the book a useful and practical onsite reference, covering a wide range of accepted well control practices.