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Dry Air Drilling

Typically layout of an air drilling site

Dry Air Drilling Overview Dry air drilling is an old underbalanced drilling technique used primarily in environmentally sensitive areas to prevent formation contamination. A basic air drilling surface setup is shown in Figure 1. FIGURE 1 However, effective hole cleaning is a problem with standard air drilling. The drag force on …

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Introduction to Underbalanced Drilling

Introduction to Underbalanced Drilling

This topic covers the underbalanced drilling method, which is defined as the practice of drilling a well with the wellbore fluid gradient less than the natural formation gradient. Besides minimizing lost circulation and increasing the penetration rate, this technique has a widely recognized benefit of minimizing the damage caused by …

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