Page 172 - Reservoir Formation Damage
P. 172

154    Reservoir Formation Damage

                      1.0






















                      1.0





                                                           Non-plugging
                     F(d)
                                                           pores
                                 Plugging
                                 pores







                                    lower     cr                    upper

                Figure  8-7.  Alteration  of  pore  throat  size  distribution  by  formation  damage
                and  acid stimulation




                the  particles  to  the  effluent  more  effectively.  However,  as  the  flow  paths
                are plugged,  the pressure difference  across the porous  media  may  exceed
                the  critical  stress  necessary  to  break  some  of  the  plugs. Therefore,  these
                plugs  break  and  release  particles  into  the  flowing  media  increasing  its
                particle concentration.  Subsequently,  the deposition  process  progresses  to
                form  new  plugs  during  which  the  flowing  media  particle  concentration
   167   168   169   170   171   172   173   174   175   176   177