BAKER HUGHES - Drilling Fluids Reference Manual

HYDRAULICS
HYDRAULICS EXAMPLE
The following is a manually worked example demonstrates the steps involved in performing
hydraulics calculations.
Drilling a deviated hole, with the following information:
• 4½" drillpipe, 16.60 lb m /ft; I.D. = 3.326"
• 300 ft. of 7¼" drill collars; I.D. = 2.8125"
• Last casing 13 3 / 8 " 61 lb m /ft; I.D. = 12.515"
• Hole size 9 7 / 8 "
• 9 7 / 8 " HTC J33 bit; Jets = three #12
• Fluid density = 15.3 lb m /gal.
• PV = 32 cps
• YP = 19 lb f /100 ft 2
• Initial gel = 5, (use as 3 rpm reading)
• 10 - min gel = 12
• 30 - min gel = 15
• Flow rate = 375 gal/min.
• Maximum available standpipe pressure = 3500 psi
• Fracture gradient at shoe = 16.5 lb m /gal
• Fracture gradient at TD = 17.0 lb m /gal
• Pore pressure at shoe = 14.0 lb m /gal
• Pore pressure at TD = 14.7 lb m /gal
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 9-29