PE 353 TUTORIAL QUESTIONS
Hoisting System
Q.1
A rig has 10 lines which are strung around the travelling block. The hook load is
250,000 Ib, calculate the static load.
Q.2
A rig must hoist a load of 300,000 Ibf. The draw works can provide a input
power to the block and tackle system as high as 500 hp. Eight lines are strung
between the crown block and travelling block.
Take power efficiency as 0.841
Calculate
i.
ii.
iii.
iv.
v.
vi.
The static tension in the fast line when upward motion is impending.
The maximum hook horsepower available,
The maximum hoisting speed,
Actual derrick load
Maximum equivalent derrick load, and
The derrick efficiency factor.
Q3.
A rotary rig that can handle triples is equipped with 1,200 hp draw works. The
efficiency of the hoisting system is 81%. Determine the time it takes to trip one
stand of pipe at a hook load of 300,000 Ib
Q 4.
A trip is to made from a depth of 20,00 ft. Determine the minimum time at
which the first stand can be tripped out if the hole. Assume the following data
Rig can handle triples
Draw works: 1000 hp
Efficiency: 75%
Drilling lines: 12
PE 353 TUTORIAL QUESTIONS
Hoisting efficiency: 50%
Drill pipe effective weight: 14 Ib/ft
Drill collar effective weight: 90 Ib/ft
CIRCULATING SYSTEM
Q1.
Compute the pump factor in units of bbl per stroke for a duplex pump having
6.5 in liner, 2.5 in rod, 18 in strokes and volumetric efficiency of 90%.
Given that 1 gal = 2331 𝑖𝑛3 , 1 bbl = 42 gal
Q2.
What is the hydraulic horse power delivered by a pump at 400 gal/min at 3,000
psi?
Q3.
A rig pumping system was producing 1500 gpm flow rate flow rate at 4,500 psi.
The output hydraulic power is?
PE 353 TUTORIAL QUESTIONS
POWER SYSTEM
Q1.
A diesel engine output torque is estimated to be 1,870 ft-Ibf at 1,100 rpm.
Determine the output power and efficiency of the engine. Fuel consumption rate
30 gal/hr. Heating value of diesel oil is 19,000 Btu/Ib.
Q2.
A diesel engine gives an output torque of 1,740 ft-Ibf at an engine speed of
1,200 rpm. If the fuel consumption rate was 31.5 gal/ hr, what is the output
power and overall efficiency of the engine?
Take density of diesel to be is 7.2 Ibm/gal
Heating value is19,000 Btu/Ibm
Q3.
A diesel engine output torque is estimated to be 870 ft-Ibf at 11,000 rpm.
Determine the output power and efficiency of the engine. Fuel consumption rate
30 gal/hr. Heating value of diesel oil is 19,000 Btu/Ib.
DRILL STRING DESIGN
1)
The tensile strength of 5 in drill pipe S - 135 premium class is 436k Ib. Expected
hook load at a total depth is 270k Ib. Determine the following parameters.
PE 353 TUTORIAL QUESTIONS
i)
ii)
The margin of overpull (MOP)
Safety factor
2)
1
Design a drill string for a hole of size 8 in., to a 15,000 ft, given the following
2
additional data
MOP desired:40,000 Ib
Drill collar:
6 in. x 3 in.; 72 Ib/ft; 720 ft
Drill pipe:
Grade E75,
20.85 Ib/ft (nominal weight)
Tension, 270 432 Ib
Buoyancy factor (BF)= 0.817
Grade G105
Tension: 378605 Ib
Weight = 21.93 Ib/ft (nominal weight)
BF = 0.817