PGE 430 Drilling
Homework 8
Due at lecture time: Nov. 6th
Using the equations in the hydraulics module please prepare a spread sheet that performs
the following calculations.
(1) Determines the friction pressure loss in each section of the circulating path; inside the
drill pipe, inside the drill collars, in the drill collar – hole annulus, and in the drill pipe –
hole annulus.
(2) Determines the optimum pump rate to maximize hydraulic horsepower at the bit.
(3) Determine the nozzle sizes, in 32
nd
”, to maximize horsepower at the bit. Please make
the nozzles diameters as large as possible.
(4) Determines if the pump rate selected will circulate a 0.3” diameter rock chip to the
surface.
Data Set:
mud
Depth = 10,000 ft
Bit Diameter = 8.75"
This bit has five nozzles.
Drill Pipe = 4.5" OD, 16.6 ppf, Grade E
Drill Collars = 480' of 6.25" OD x 2.875" ID
Maximum Pump Pressure = 3,000 psi
12 ppg
ρ
=
a
2
f
20 cp
10 sec gel = 12 lb / 100 ft
Cutting Density = 2.65 g/cc
μ
=
(5) What is the largest particle diameter that can be suspended by the mud if circulation is
stopped?
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 Spring '06
 Chenevert
 Fluid Dynamics, data entry, drill pipe, lbs lbs lbs

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