Underbalanced drilling driven by success

Underbalanced drilling (UBD) operations maintain the net pressure exerted by drilling fluids in the annular space between the drillstring and the formation being drilled at values less than the formation pore pressure, as explained by D. Brant Bennion and F. Brent Thomas of Hycal Energy Research Laboratories Ltd., Aberdeen.The authors presented their paper on evaluating reservoir performance improvements from underbalanced drilling operations at the International Association of Drilling Contractors (IADC) Underbalanced Technology Conference and Exhibition in November in Aberdeen.The resulting pressure imbalance allows oil, water, or gas in the reservoir pore space to flow into the wellbor...

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