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.

Feb 11th, 2002
Th 83731
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