Page 162 - Reservoir Formation Damage

144 Reservoir Formation Damage

The net amount of particles deposited in porous media is expressed by:

Instantaneous amount of particles in porous matrix = initial amount of
particles in porous matrix + net amount of particles deposited on pore
surface + net amount of particles deposited behind pore throats.

The various particulate processes are depicted in Figure 8-3.
The fundamental particle generation mechanisms are:

1. Hydrodynamic mobilization
2. Colloidal expulsion
3. Liberation of particles due to the loss of integrity of rock grains
by chemical dissolution of cement or by rock compression, crushing,
and deformation
4. Chemical and physico-chemical formation

Unswollen Swollen
Particles Particles
in the Extending Deposited
Porous from Pore Particles
Matrix Surface

Particles
Suspension
T
DEPOSITION

FLOWING PHASE
Plague
ENTRAPMENT
&

Figure 8-3. Particulate processes in porous media (after Civan, 1994;
reprinted by permission of the U.S. Department of Energy, modified after
Civan et al. 1989, from Journal of Petroleum Science and Engineering, Vol.
3, "Alteration of Permeability by Fine Particle Processes," pp. 65-79, ©1989,
with permission from Elsevier Science).