Page 308 - Reservoir Formation Damage

288 Reservoir Formation Damage

The Jiao and Sharma (1994) data and the missing parameter values,
which have been approximated by fitting the experimental data, are given
in Table 12-1. The results presented in Figure 12-8 indicate that the
model represents the measured filtrate volumes over the complete range
of 600 min of filtration time as closely as the quality of their experimental
data permits. However, they did not measure the cake thickness, but
predicted it using a simple algebraic model. As shown in Figure 12-9,
the cake thicknesses predicted by Jiao and Sharma (1994) and Civan
(1998a) are close to each other.
Willis et al. (1983) conducted linear filtration experiments using a
suspension of lucite in water. As shown in Table 12-1, they reported only
a few parameter values. They only provide some measured filtrate flow
rate and cake thickness data in their Table 2. However, the filtration time
data is missing. Therefore, a full scale simulation of their filtration process
as a function of time could not be carried out by Civan (1998a). Only
the linear plotting of the measured data according to Eq. 12-29 could be
accomplished. As indicated by Figure 12-10, the best linear fit of Eq.
12-29 with the least-squares method has been obtained with a coefficient
of regression of R 2 = 0.9921, very close to 1.0. This reconfirms the
validity of the filtration model.

Predicted in the present
study
»- Measured by Jiao and
Sharma(1994)

100 200 300 400 500 600
Filtration Time, t, min
Figure 12-8. Comparison of the predicted and measured filtrate volumes for
linear filtration of fresh water bentonite suspension (Civan, R, 1998; reprinted
by permission of the AlChE, ©1998a AlChE. All rights reserved).