Which type of blowout preventer (BOP) is suitable for shut-in procedures?

The correct choice indicates that either type of blowout preventer (BOP) can be used for shut-in procedures. This is important because both mechanical and hydraulic BOPs have the capability to seal the well and control the flow of fluids during such procedures.

Mechanical BOPs operate through physical components, such as rams, which close off the wellbore when activated. This type of BOP is reliable and effective for situations where a well needs to be secured quickly and efficiently.

On the other hand, hydraulic BOPs utilize fluid pressure to operate their closing mechanisms, providing a more flexible and easily controlled option. They can respond quickly to changes in well conditions and are often favored in complex drilling environments due to their ability to manage multiple functions simultaneously.

Both systems can effectively prevent uncontrolled flow, which makes either type appropriate for maintaining well control during shut-in procedures.