Functions of drilling fluid
Solids and the liquid phases of drilling muds invade and interact with reservoir formations. This invasion and interaction changes formation permeability and can prevent fluid flow from the reservoir into the wellbore. Damage caused by mud spurt and drilling-mud filtrate can influence log response. The full-length paper describes a novel method to determine the formationdamage potential of drilling muds by evaluating the erosional characteristics of mudcakes formed by different mud systems.