14. Well Control
• Kick
– “an unscheduled entry of formation fluids into
the wellbore, of sufficient Quantity to require
shutting in the well.
• Blowout
– Loss of control of a kick
17. Well Control
• Blowout
– Surface
– Underground
• Blowouts caused by
– equipment failure
– human error
18. Well Control
• Engineers in office can aid in well control
by:
– Provide pressure profiles for all pending wells
– Provide offset information such as logs, bit
records, mud reports, drilling records.
– Provide support and assistance personnel on
location.
20. Hydrostatic Pressure
• Derive HSP equation
• Calculate the HSP for each of the following:
– 10,000’ of 12.0 ppg mud
– 12,000’ of 10.5 ppg mud
– 5,000’ of 11.2 ppg mud on top of 6,000’ of 16.5
ppg mud
21. Hydrostatic Pressure
• Derive HSP equation
– Area = A, sq.ft.
– Height = h, ft.
– Density = MW, ppg
• Weight of fluid =
– A*h (ft3)*62.4 lb/ ft3
*MW/8.33
– =62.4/8.33*MW*A*h
h
A
MW
22. Hydrostatic Pressure
• This weight is equally distributed over an
area of A sq.ft or 144*A sq. in.
• Pressure = Weight (force)/area
• = 62.4*MW*A*h
• 8.33*144*A
• P=.052*MW*h where h=TVD
26. Terminology
• Slow Pump Pressure
• Taken:
– every tour by each driller
– pumps repaired or liners changed
– mud properties change
– every 500’ of hole
– change in BHA
– bit nozzles changed
