Reduction in Bottomhole Pressure if Riser is Disconnected

Example: Use the following data and determine the reduction in bottom-hole pressure if the riser is disconnected:

Seawater gradient = 0.445 psi/ft Well depth = 2020 ft RKB Mud weight = 9.0 ppg

Step 1 Determine bottomhole pressure:

Step 2 Determine bottomhole pressure with riser disconnected:

BHP = (0.445 x 700) + [9.0 x 0.052 x (2020 — 700 — 75)] BHP = 311.5 + 582.7 BHP = 894.2 psi

Step 3 Determine bottomhole pressure reduction:

BHP reduction = 945.4 psi — 894.2 psi BHP reduction = 51.2 psi

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  • Benjamin Lang
    How to calculate reduction in bottom hole pressure?
    8 years ago

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