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58 Part I Liquid Drilling Systems

Dodge, D.G., Metzner, A.B., 1959. Turbulent flow of Non-Newtonian systems.
AIChE J 5, 189.
Fang, Q., Guo, B., Ghalambor, A., 2008. Formation of underwater cuttings piles in
offshore drilling. SPE Drill. Completion J. (March 2008), 23–28.
Gregory, G.A., Fogarasi, M., 1985. Alternate to standard friction factor equation. Oil Gas J.
(April), 120–127.
Guo, B., Ghalambor, A., 2002. Gas Volume Requirements for Underbalanced Drilling
Deviated Holes. PennWell Books.
Herschel, W.H., Bulkley, R., 1926. Konsistenzmessungen von Gummi-Benzollosungen.
Kolloid-Z 39, 291–300.
Moore, P.L., 1986. Drilling Practices Manual, second ed. PennWell Books.
Walker, R.E., Mayes, T.M., 1975. Design of mud for carrying capacity. JPT ( July),
Trans. AIME 259, 893–900.

PROBLEMS
2.1 A 12-ppg Bingham plastic fluid with a plastic viscosity of 20 cp and
2
a yield point of 10 lb/100 ft is circulating at 300 gpm in a 7⅞-in-
diameter borehole. Determine the flow regime inside a 4½-in
OD, 16.60-lb/ft drill pipe (3.826-in ID), and in the drill pipe/hole
annulus.
2.2 An 11-ppg Power Law fluid with a flow consistency of 50 eq.
cp and flow behavior index of 0.8 is circulating at 300 gpm in an
8½-in-diameter borehole. Determine the flow regime inside a 4½-in
OD, 16.60-lb/ft drill pipe (3.826-in ID), and in the drill pipe/hole
annulus.
2.3 Predict the parasitic pressure loss under the following conditions:
Total depth: 9,950 ft (3,036 m)
Casing: 9⅝ in, 43.5 lb/ft (8.755-in ID), set at 6,500 ft (1,982 m)
Open hole: 7⅞ in from 6,500 ft to 9,950 ft
Drill pipe: 9,500 ft of 4½ in, 16.6 lb/ft (3.826-in ID)
Drill collar: 450 ft of 6¾-in OD and 2¼-in ID
Surface equipment: Combination 4
Mud weight: 11.5 ppg
Plastic viscosity: 45 cp
Yield point: 10 lb/100 ft 2
Mud flow rate: 350 gpm
2.4 Predict the parasitic pressure loss under the following conditions:
Total depth: 9,950 ft (3,036 m)
Casing: 9⅝ in, 43.5 lb/ft (8.755-in ID), set at 6,500 ft (1,982 m)
Open hole: 8½ in from 6,500 ft to 9,950 ft
Drill pipe: 9,500 ft of 4½ in, 16.6 lb/ft (3.826-in ID)
Drill collar: 450 ft of 6¾-in OD and 2¼-in ID