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 …

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 …

Learning Objectives: After completing this topic “Hydraulic Fracturing Fluids”, you will be able to: - List the functions performed by ...