Abstract
Practical applications of the mathematical models are demonstrated for air (or other gases) and unstable foam drilling. These applications are for both performance drilling and underbalanced drilling direct circulation operations. The overarching models given in previous chapters are supplemented with practical tools such as the flow of compressed air (or other gases) through the complicated “Tee” of wellheads and the complex outer wall structure of an annulus of sequences of rock and steel casing surfaces. The minimum volumetric flow rate of air required to clean the bottom of the hole of drill bit generated rock cuttings is established. The issue of drilling into flammable gas producing formations is discussed and the accepted practice criteria established. Example calculations are given with each practice criteria.
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