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Keywords: underbalanced drilling
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Proceedings Papers

Paper presented at the SPE North Africa Technical Conference and Exhibition, September 14–16, 2015
Paper Number: SPE-175736-MS
... conditions valid for the models. Abstract Traditionally, several multiphase hydraulic calculations are required to determine the permissible surface-parameter operating envelope in underbalanced drilling (UBD) operations to estimate how bottomhole pressure (BHP) and the desired underbalanced condition...
Proceedings Papers

Paper presented at the North Africa Technical Conference and Exhibition, February 20–22, 2012
Paper Number: SPE-152412-MS
... during overbalanced drilling (OBD), which is a method of drilling in which the wellbore pressure remains greater than formation pressure. During the past ten years, underbalanced drilling operations (UBD), which can be defined as a drilling method in which the wellbore pressure is less than formation...
Proceedings Papers

Paper presented at the SPE North Africa Technical Conference & Exhibition, March 12–14, 2008
Paper Number: SPE-112907-MS
... UBD operations for the hole section was confirmed by instantaneous ROP measurements, with kill weight (overbalanced mud) compared to underbalanced instantaneous ROP. Overall, the duration of the underbalanced drilling activities was 18 days, with 666 metres drilled involving several drilling bit...

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