Q.1) What is the porosity (or liquid volume fraction) ofan 11 lb/gal mud, assuming

that it consists of water and clay particles of density 2.65g/cm3? The density of water

is 8.3 lb/gal (1.00 g/cm3).

Q.2) In the formation of a mudcake, an annulus of lowerporosity mud is formed by

expelling some of the water in the mud into the formation. Atypical mudcake density

is 2.0 g/cm3. What is its porosity, assuming that it was formedfrom the 11 lb/gal mud

from the previous question?