What will happen to U-tube? If a heavy slug is pumped into the drill string and the well is shut ?

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What will happen to U-tube? If a heavy slug of 10 bbl is pumped into the drill string with below-given data and the well is shut by closing BOP and FOSV in the drill string.
Well TVD: 10000 ft.
Mud weight: 10 ppg.
To pull out, dry driller pumps heavy slug. This video will explain what will happen to pit levels and BHP if the slug id pumped into the drill pipe. This video will also explain about what will happen to BHP if a light pill is pumped in the drill string and the well is close.
Slug density: 16.8 ppg.
Slug volume: 10 bbl.
Drill pipe Metal Disp: 0.008 bbl/ft
Drill pipe Capacity: 0.0176 bbl/ft.
A. A back pressure of 200 psi will visible on the drill string gauge.
B. A back pressure of 150 psi will be visible on the annulus gauge.
C. A back pressure of 200 psi will be visible on the annulus gauge.
D. A back pressure of 150 psi will visible on the drill string gauge.
E. The Well is under balance due to a heavy slug in the drill string.
Well control, IWCF, IADC, Drilling, U-Tube effect
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