Effect of Various Drilling Fluid Additives on Water Loss and Permeability of Filter Cakes

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Abstract
A systematic study of the effect of different mud additives upon the filtration and wall-building properties of drilling fluids was conducted. Permeability of filter cakes was measured before and after addition of chemicals. A straight-line relationship was generally found to exist between water loss and mud-cake permeability, except in the case of presence of water-loss-reducing agents. Different additives affect values of the slope and the intercept in distinctive ways. Inert materials give rise to low slope values as compared to those obtained with electrolytes, whereas thinners produce intermediate slope values. Similar additives produce comparable slope and intercept values.

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