Blowout preventer or BOP is invented by HARRY S.CAMARON in 1922. BOP is a large specified valve usually installed in stacks.it was invented to prevent blowout of oil wells. The terms blowout preventer, blowout preventer stack are commonly used interchangeably and in a general manner to describe an assembly of several stacked blowout preventer of varying type and function, as well as auxiliary component .a typical subsea deep water blowout preventer system includes components such as electrical and hydraulic line, control pods, hydraulic accumulator, ram type BOP and annular type BOP.

Blowout is an uncontrollable flow of crude oil or natural gas from the oil well.it happens when the hydrostatic pressure of cutting mud decrease below the pressure of formation fluid. Blowout leads to the explosion of drilling rig, and effect the environment of nature. Just like blowout happen in Gulf of Mexico on April 20, 2010.miles of sea area is spreader with oil, tons of fuel is wasted, badly effect the environment and ecosystem of sea.

There are mainly two types of BOP over there RAM type and ANNULAR type .the function of these two are same but operation and pressure rating is different. RAM type BOP is capable to withstand pressure over 20000 psi but annular only have a pressure rating in between 500 to 1500 psi pressure.

BOP- is a large specified valve usually installed in stacks.it was invented to prevent blowout of oil wells. The terms blowout preventer, blowout preventer stack are commonly used interchangeably and in a general manner to describe an assembly of several stacked blowout preventer of varying type and function, as well as auxiliary component .a typical subsea deep water blowout preventer system includes components such as electrical and hydraulic line, control pods, hydraulic accumulator, ram type BOP and annular type BOP. A well kick can be kept under control if the proper pressure control equipment is used, which is called a blowout preventer stack, is installed at the surface. The blowout preventer stacks are massive devices with steel reinforced rubber goods. When they are activated they are required to close/seal the borehole and secure the well. The contacting sealing pressure must be greater than formation fluid pressure. In some cases this pressures might be more than 20,000 psi. , a blowout preventer stack generally utilizes several different types of blowout preventers; annular and ram types.