Though not as common as overbalanced drilling, underbalanced drilling is achieved when the pressure exerted on the well is less than or equal to that of the reservoir. Performed with a light-weight ...
Data from wells drilled in 2008 to produce gas from the Canyon sands of the Val Verde basin of West Texas illustrate the effectiveness of hammer bits and underbalanced drilling. Data from wells ...
Drilling underbalanced, or near balancedwith lightweight drilling fluids, has practical applications offshore. Underbalanced drilling (UBD), a technique in which the hydrostatic head of drilling fluid ...
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