The benefits of UnderBalanced Drilling-UBD are now widely understood and revealed. However, the impact of UBD on well productivity/injectivity is still elusive. Few papers have documented historical applications of UBD and a recent focus has been to quantify UBD benefit through productivity increase comparisons, or productivity improvement factors-PIFs against field averages. Yet, comparative analyses are questionable. A process named Suitable Underbalanced Reservoir Evaluation (SURE) has been developed to identify UBD prospects and to quantify the potential well productivity/injetivity benefits of a UBD operation. SURE is a simple, fast and reliable way to accurately evaluate the suitability of an UBD operation for reservoir performance.
No takes yet. Share an insight, caveat, or question.
Qutob et al. (2005) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: