Page 181 - Petroleum and Gas Field Processing

For T ¼ 1058F: d m ¼ 200 o ¼ 200ð20Þ 0:25 ¼ 423 mm
For T ¼ 858F: d m ¼ 200 o ¼ 200ð45Þ 0:25 ¼ 518 mm
Ignoring the effect of temperature on specific gravity, use Eq. (13) to
determine the settling constraint for each treating temperature:

For T ¼ 125 F
7000 10
Q o o
DL ¼ 436 ¼ 436 2 ¼ 1204 in: ft ðE1Þ
ð
Þd m 0:2 356
For T ¼ 105 F

7000 20
Q o o
DL ¼ 436 ¼ 436 ¼ 1706 in: ft ðE2Þ
ð
Þd m 0:2 423 2

For T ¼ 85 F
7000 45
Q o o
DL ¼ 436 ¼ 436 2 ¼ 2559 in: ft ðE3Þ
ð
Þd m 0:2 518
Use Eq. (14) to determine the relationship for retention time constraints:
Q o t 7000 20
2 2
D L ¼ ¼ ¼ 133,333 in: ft ðE4Þ
1:05 1:05
Assume different values for D and determine the corresponding values of L
from Eqs. (E1)–(E4). The results are summarized in the following table and
are plotted for comparison.

D (in.) L (ft) L (ft) L (ft) L (ft)
[Eq. (E4)] [Eq. (E3)] [Eq. (E2)] [Eq. (E1)]

60 37.04 42.65 28.43 20.07
72 25.72 35.54 23.69 16.72
84 18.90 30.46 20.31 14.33
96 14.47 26.66 17.77 12.54
108 11.43 23.69 15.80 11.15
120 9.26 21.33 14.22 10.03
132 7.65 19.39 12.92 9.12
144 6.43 17.77 11.85 8.36
156 5.48 16.40 10.94 7.72

Analyzing the tabulated/plotted results yields the following
conclusions:
1. Any combination of D and L that exists in the plot area below
the retention time curve is not acceptable.

Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved.