What is a BOP? A Blowout Preventer (BOP) is an important piece of equipment used in well operations in the oil and gas industry to prevent uncontrolled releases of crude oil or natural gas from the wellbore. BOPs ensure that pressure control is maintained during drilling, well completion and well intervention operations. Basically, the main function of a BOP is to seal the well when there is an unexpected increase in pressure from the geological formations more than the wellbore pressure. TYPES