Methods of plugging a permeable porous cellular body

A method of plugging a permeable porous cellular body to a desired maximum, self-limiting, depth comprising:

• (A) contacting the permeable porous cellular body with a plugging mixture, the permeable porous cellular body defining a plurality of channels;
• and
• (B) either
• (i) forcing the plugging mixture into the plurality of channels at a first constant flow rate until a first maximum, self-limiting, depth of plugging mixture is disposed within the plurality of channels and maintaining the first constant flow rate of the plugging mixture into the plurality of channels until a pressure on the plugging mixture elevates to a predetermined pressure, or
• (ii) forcing the plugging mixture into the plurality of channels at a first constant pressure until a first maximum, self-limiting, depth of plugging mixture is disposed within the plurality of channels and maintaining the first constant pressure applied to the plugging mixture until flow of the plugging mixture into the plurality of channels decays from an initial flow rate to a predetermined flow rate;
• (C) changing one or more of the following;
• (i) the first constant pressure to a second constant pressure;
• (ii) the first constant flow rate to a second constant flow rate;
• (iii) a first hydraulic diameter dh of the plurality of channels to a second hydraulic diameter dh;
• (iv) a first absorptive capacity of the porous cellular body to a second absorptive capacity;
• (v) a first permeability of inorganic particles within the plugging mixture to a second permeability;
• (vi) a first viscosity of liquid in the plugging mixture to a second viscosity;
• (vii) a first viscosity of the plugging mixture to a second viscosity;
• and
• (D) performing (A) and (B) again until a second maximum, self-limiting depth of plugging mixture is disposed within the plurality of channels, the second maximum self-limiting depth being different than the first maximum, self-limiting depth.