[QUOTE=BLISTERS;39969]Approximately, if the choke line was filled with seawater @ 8.33 ppg and the wrong set of rams isolated the choke side outlet from the wellbore then we have, ie 5000 ft x 8.33 ppg x 0.052 = 2165 psi ;for chokeline hydrostatic & air gap omitted 5000 ft x 0.052 x 14 ppg = 3640 psi for OBM hydrostatic in riser, difference eing 1474 psi. My point being the inflow test was ok but they did not prime the chokelines with OBM.[/QUOTE]
You would fit in nicely with BP as well!! Idea is to isolate all this back pressure (with rams if annular is leaking) so that you only read pressure from a possible leak!