STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

Drilling Muds and Completion Fluids 653
Table 4-44
Specific Weight Conversion
1 2 3 4 5
Gradient,
1Wgd lbm3 glem30r p~vn (t@d)
spodfic of m
gravity depth ofdepth
6.5
7.0
7.5
8.0
8.3
8.6
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
24.0
48.6
52.4
66.1
59.8
62.3
63.6
67.3
71.1
74.8
78.5
82.3
86.0
89.8
93.6
97.2
101.0
104.7
108.5
112.2
116.9
119.7
123.4
127.2
130.9
134.6
138.4
142.1
145.9
149.6
153.3
157.1
160.8
164.6
168.3
172.1
175.8
179.5
0.78
0.84
0.90
0.96
1.00
1.02
1.08
1.14
1.20
1.26
1.32
1.38
1.44
1.60
1.66
1.62
1.68
1.74
1.80
1.86
1.92
1.98
2.04
2.10
2.16
2.22
2.28
2.34
2.40
2.46
2.52
2.58
2.64
2.70
2.76
2.82
2.88
0.338
0.364
0.390
0.416
0.433
0.442
0.468
0.494
0.619
0.546
0.671
0.597
0.623
0.649
0.675
0.701
0.727
0.763
0.779
0.806
0.831
0.857
0.883
0.909
0.936
0.961
0.987
1.013
1.039
1.065
1.091
1.117
1.143
1.169
1.195
1.221
1.247
0.078
0.084
0.090
0.096
0.100
0.102
0.108
0.114
0.120
0.126
0.132
0.138
0.144
0.150
0.166
0.162
0.168
0.174
0.180
0.186
0.192
0.198
0.204
0.210
0.216
0.222
0.228
0.234
0.240
0.246
0.262
0.258
0.264
0.270
0.276
0.282
0.288
Gel strength, in units of lbf/100 fts, is obtained by noting the maximum dial
deflection when the rotational viscometer is turned at a low rotor speed (usually
3 rpm) after the mud has remained static for some period of time. If the mud
is allowed to remain static in the viscometer for a period of 10 s, the maximum
dial deflection obtained when the viscometer is turned on is reported as the
initial gel on the API mud report form. If the mud is allowed to remain static
for 10 min, the maximum dial deflection is reported as the IO-min gel.