Subsea-specific well control questions tend to be shorter but denser — one wrong gauge, one wrong rating assumption, and the whole answer flips. Here are two worth knowing cold.
1. Which gauges drop while the annular preventer is closing
On the remote BOP panel, while the annular preventer is closing, the pressure drop shows up on the accumulator pressure and annular pressure gauges — not manifold pressure and accumulator pressure. Manifold pressure stays fed from the accumulator bank; it’s the annular’s own closing pressure and the accumulator supplying it that dip during the close cycle.
2. What fixed bore ram BOPs are actually rated for
Fixed bore ram type BOPs are designed to contain Rated Working Pressure only from below the closed ram — not “cannot be used to hang off the drill string,” which is a separate (and incorrect) claim about a different capability. The rating limitation is about pressure direction, not about whether the ram can be used for hang-off duty.
For the pressure math behind riser margin and subsea kill scenarios, the riser margin calculator runs the formulas live, and the well control reference page covers the underlying theory. Surface-stack ram and BOP fundamentals are covered in well control basics.