BAKER HUGHES - Drilling Fluids Reference Manual

Hydraulics
Figure 1-15
SEM Photomicrograph X 150 – 2% PERFFLOW ® Filter Cake on AF-6
Figure 1-16 shows a photomicrograph of a cross section of a filter cake on a filter media with 24-
Darcy permeability. In Figure 1-16 the particles have formed an internal bridge in a pore opening that
is approximately 20 micrometers in diameter but, even in this size opening, the intrusion is only about
50 micrometers
Figure 1-16
SEM Photomicrograph 2% KCl PERFFLOW ® – Pore Bridging
Reference Manual
Baker Hughes Drilling Fluids
1-40 Revised 2006