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Volume of Annulus
Cubic Feet/ Linear Foot
Gal/Lin Ft
Hole Dia
Casing Diameter (in)
0
2
4
6
8
10
12
14
16
20
24
30
0.16
2"
0.022
0.65
4"
0.087
0.07
1.02
5"
0.136
0.11
0.05
1.47
6"
0.196
0.17
0.11
2.00
7"
0.267
0.25
0.18
0.07
2.61
8"
0.349
0.33
0.26
0.15
3.30
9"
0.442
0.42
0.35
0.25
0.09
4.08
10"
0.545
0.52
0.46
0.35
0.20
5.87
12"
0.785
0.76
0.70
0.59
0.44
0.24
8.00
14"
1.069
1.05
0.98
0.87
0.72
0.52
0.28
10.44
16"
1.396
1.37
1.31
1.20
1.05
0.86
0.61
0.33
13.22
18"
1.767
1.75
1.68
1.57
1.42
1.22
0.98
0.70
0.37
16.32
20"
2.182
2.16
2.09
1.99
1.83
1.64
1.40
1.11
0.79
23.49
24"
3.142
3.12
3.05
2.95
2.79
2.60
2.36
2.07
1.75
0.96
36.73
30"
4.909
4.89
4.82
4.71
4.56
4.36
4.12
3.84
3.51
2.73
1.77
52.88
36"
7.069
7.05
6.98
6.87
6.72
6.52
6.28
6.00
5.67
4.89
3.93
2.16
Material Required per Cubic Foot
Bentonite
1/2" Tablets
3/8" Tablets
1/4" Tablets
Medium
Chips
Coarse Chips
Granular
lbs of Mat'l
75.99
79.42
80.72
69.25
67.30
65.012
Geotechnical and Environmental Studies & Design Recommendations - Barron & Associates
Specialty Drilling Services - Buffalo Drilling Company
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