Drill String Volume in Barrels = ID2 / 1029.4 * Pipe Length
Drill Pipe : 6 in OD, 4.356 ID, 9650 feet in length
Drill Pipe : 8 in OD, 3.5 in ID, 900 feet in length
1 : Drill Pipe Volume in bbls = (4.3562 / 1029.4) * 9650 = 117.88 bbls 2 : Drill Collar Volume in bbls = (3.52 / 1029.4) * 900 = 10.71 bbls 3 : Find total Drill String Volume: Add the Drill Pipe Volume in bbls + Drill Collar in bbls. Total Drill String Volume = 177.88 bbls + 10.71 = 188.59 bbls