A blowout preventer (BOP) is a critical safety device used in the oil and gas industry to prevent uncontrolled releases of crude oil or natural gas from a well. It is installed on the wellhead and can seal the well in case of a pressure surge, known as a blowout. BOPs are designed to withstand high pressures and are essential for protecting workers and the environment during drilling operations. These devices come in various types, including annular preventers and ram preventers, each serving specific functions. The use of a blowout preventer is a standard practice in drilling operations, ensuring that any unexpected pressure changes can be managed effectively to prevent accidents and spills.