Wall Cake 2 : The solid material deposited along the wall of the hole resulting from filtration of the fluid part of the drilling fluid or cement slurry into the formation. (Bul 10C, Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}