Difficult wells require new well control procedure

The development of new software tools and downhole sensors has led to a better understanding of dynamic conditions in the wellbore, allowing drillers to make fundamental changes in the way they approach well control.Before these technologies became available, however, the complexity of multiphase flow forced drilling personnel largely to ignore conditions in the annulus. In its place, very simple assumptions, based solely on drill pipe pressure, had to be made.Yet today, drilling near the "edge"-with smaller tolerances between mud weights and fracture pressures, typically prevalent in high pressure, deepwater, and underbalanced wells-no longer affords drilling professionals the luxury of ...

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