Barrels gained pumping slug, bbl
= (bbl slug pumped x slug wt, ppg mud wt, ppg) - bbl slug
Example: Determine the number of barrels of mud gained due to pumping the slug and determine the feet of dry pipe.
Mud weight = 12.6ppg
Slug weight = 14.2 ppg
Barrels of slug pumped = 25 barrels Drill pipe capacity = 0.01776 bbl/ft
Barrels gained = (25bbl x 14.2ppg 12.6ppg) - 25bbl = 28.175 - 25 = 3.175 bbl
Determine the feet of dry pipe after pumping the slug.
Feet of dry pipe = 3.175bbl - 0.01776bbl/ft = 179 feet
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