U-Tube Calculations

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U-Tube Calculations

1 / 10

The well was shut-in.
Well Information:
Drill pipe pressure (DPP) = 0 psi (no float in the drill string)
Well depth = 8800 ft TVD / 9899 ft MD
Drill string if full of 11 ppg fluid
Annulus is full of 6.0 ppg mud/gas mixture
What would be the casing pressure in this static u-tube?

2 / 10

After pumping a slug into the drill string, the well is closed before the slug falls. What u-tube pressure would be seen in the casing gauge?
Mud Weight = 11 ppg
Slug Weight = 15.5 ppg
Slug Length = 1000 ft
Well Depth = 7500 ft TVD / 11000 ft MD

3 / 10

The well was shut-in. What would be the casing pressure in this static u-tube?
Drill pipe pressure (DPP) = 0 psi (no float in the drill string)
Well depth = 5500 ft TVD / 8200 ft MD
Drill string if full of 9.8 ppg fluid
Annulus is full of 6.2 ppg mud/gas mixture

4 / 10

A slug is displaced into the drill string and the well is lined up on the trip tank. How much mud would return after the slug falls?
Slug volume = 35 bbls
Slug density = 15.1 ppg
Mud Weight = 10.1 ppg
Pipe Capacity = 0.01776 bbl/ft
Annular Capacity = 0.0505 bbl/ft
Well depth = 7000 ft TVD / 8500 ft MD

5 / 10

The well was shut-in.

Well Information:
Drill pipe pressure (DPP) = 0 psi (no float in the drill string)
Well depth = 7500 ft TVD / 10 000 ft MD
Drill string if full of 10 ppg fluid
Annulus is full of 6.5 ppg mud/gas mixture

What would be the casing pressure in this static u-tube?

6 / 10

A slug is displaced into the drill string and the well is lined up on the trip tank. How much mud would return after the slug falls?
Slug volume = 45 bbls
Slug density = 14.0 ppg
Mud Weight = 11.2 ppg
Pipe Capacity = 0.01776 bbl/ft
Annular Capacity = 0.0505 bbl/ft
Well depth = 7000 ft TVD / 8500 ft MD

7 / 10

A slug is displaced into the drill string and the well is lined up on the trip tank. How much mud would return after the slug falls?
Slug volume = 50 bbls
Slug density = 13.5 ppg
Mud Weight = 10.1 ppg
Pipe Capacity = 0.01776 bbl/ft
Annular Capacity = 0.0505 bbl/ft
Well depth = 8200 ft TVD / 9800 ft MD

8 / 10

After pumping a slug into the drill string, the well is closed before the slug falls. What u-tube pressure would be seen in the casing gauge?
Mud Weight = 12.3 ppg
Slug Weight = 14.8 ppg
Slug Length = 1350 ft
Well Depth = 11000 ft TVD / 13000 ft MD

 

9 / 10

Consider the information below to answer the following question:

Slug Information = 40 bbl / 15.0 ppg
MW = 11.5 ppg

What mud volume would return after the slug falls? (In addition to the slug volume pumped)

10 / 10

What additional mud volume would return after the slug falls?
Slug Information = 50 bbl / 14.0 ppg
MW = 10.2 ppg

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