Omani field tests compare UBD to conventional drilling ///
Utilization of underbalanced drilling (UBD) at Petroleum Development Oman (PDO) stretches back to sporadic projects in the mid-1990s. However, not until recently were tangible gains realized using this technique. Although UBD’s benefits are widely accepted within North America, the technology has not been fully exploited internationally for several reasons, particularly justification of increased drilling costs against perceived “intangible” benefits. Such justification is particularly hard for asset managers and well planners to make in the absence of concrete industry data on production increases.
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