PGE 430 Drilling
Homework 1 Solution
Due at lecture time: W 9/9/09
(total possible score: 10.0)
(1) A draw works is rated at 1500 input Hp. The maximum load that can be picked up is
1,000,000 lbs on 12 lines.
Please show the equations required and prepare a table of results to show:
(a) The velocity of the blocks (ft/min) for weights starting at 1,000,000 lbs and
descending 100,000 lb increments.
(
29
(
29
33,000
1500 0.77 33,000
38.1 ft/min
1,000,000
i
b
PE
v
W
=
=
=
(b) The velocity of the fast line.
(
29
12
38.1
457.2 ft/min
f
b
v
nv
=
=
=
(c) The required draw works drum speed in revolutions per minute (rpm) if the drum is 5’
in diameter.
(
29
2
ft
revolution
457.2
29.1 rpm
2
min
ft
5
D
f
D
v
v
d
π
π
=
=
=
Note that the drum cannot be turned faster than 100 rpm.
Do one example calculation at 1,000,000 lbs.
(+1 pt for sample calculations)
The other
results can be in the table.
(+1 pt for correct table)
W (lbf)
Vb (ft/min)
Vf (ft/min)
drum rpm
1,000,000
38.1
457.4
29.1
900,000
42.4
508.2
32.4
800,000
47.6
571.7
36.4
700,000
54.5
653.4
41.6
600,000
63.5
762.3
48.5
500,000
76.2
914.8
58.2
400,000
95.3
1,143.5
72.8
300,000
127.1
1,524.6
97.1
200,000
130.9
1,570.8
100.0
top speed
(2) Please compute the volume of natural gas in MScf/Day that is required to provide the
equivalent input power to an engine as diesel oil used at 40 gal/hour.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '06
 Chenevert
 drill string, Total Possible Score

Click to edit the document details