wall cake

wall cake

[′wȯl ¦kāk]
(petroleum engineering)
In drilling operations, the solid deposit along the hole wall due to filtration of the fluid part of the mud into the formation.
References in periodicals archive ?
Multi-purpose drilling gel provides strong wall cake and formation control for all drilling types.
We add PAC polymers to aid the bentonite fluid to lay down an impermeable wall cake when drilling sands.
1-GEL provides viscosity, gel strength, hole-cleaning, wall cake and lubricity while remaining pumpable.