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Using diagenetic facies models to assess formation damage potential is one of the more innovative applications of this approach. Drilling and stimulation fluids are an every–day part of well completion programs. Unfortunately, the choice of which fluids to use is often based on factors such as past histories in an area, service company recommendations, or hunches. As a result, in all too many cases, these fluids do more harm than good in the reservoir. So, the question arises is it possible to avoid this situation by predicting what sort of problems will be encountered in a reservoir, both in terms of what types of potentially reactive minerals are likely to be present, and how these minerals are likely to react with a given fluid? And, the answer is yes. Diagenetic components, in particular clay minerals, are responsible for most documented fluid sensitivities. Understanding the nature of mineral sensitivities and knowing how to use a geologic model that predicts the distribution of particular clay types is the key to preventing problems before they happen.

To illustrate how one might go about defining potential formation damage problems and preventing them we will look at two different studies. The first involves the Cambrian Flathead and Gros Ventre Formations of Wyoming. In this study we will look at potentisal formation damage problems as a function of facies, and examine changes in completion/stimulation approaches suggested by these results. The study shows clearly that the Flathead/Gros Ventre interval is by no means homogeneous and that reservoir

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