Page 244 - Reservoir Formation Damage

224 Reservoir Formation Damage

g 3
"o <V <
i*-.
s>

eo
o: •*

10 15 20

Depth of filter bed, H, mm

Figure 10-19. Correlation of the Cerhansky and Siroky (1985) data for
variation of the rate coefficients by the thickness of porous media.

The effect of the suspension particle concentration and particle size
on the pressure drop is shown in Figure 10-20.
For a given injection suspension particle concentration and rate, at
equilibrium, Eq. 10-91 for T' r =0 yields

(10-177)

in which the permeability is determined by:

K* = u\a L/Ap* (10-178)

Figure 10-21 shows the equilibrium e* and K* values calculated
by Eqs. 10-177 and 178, which are attained during the injection of
G in=Q.lkg/m 3 concentration suspension at various constant injec-
tion rates.

Applications of the Gruesbeck and Collins Model

Gruesbeck and Collins (1982) conducted core flow tests under constant
rate and pressure difference conditions and studied the formation damage
effects and determined the relevant rate constants. Their data analysis
methods and results are presented in the following.