When pulling DRY pipe Step

number average pipe arre s = of stands x length per x displacement displaced pu]]ed stand) ft bbl/ft

Step 2

HP, psi = barrels displaced x 0 052 x mud decrease casing pipe capacity, - displacement, bbl/ft bbl/ft weight, ppg

Example: Determine the hydrostatic pressure decrease when pulling DRY pipe out of the hole:

Number of stands pulled = 5 Average length per stand = 92 ft Pipe displacement = 0.0075 bbl/ft

Casing capacity = 0.0773 bbl/ft

Mud weight = 11.5ppg

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