Underbalanced Offshore Coiled Tubing Drilling in Tight Sandstone Case Study: Part One

9th January 2019                         COILED TUBING DRILLING                          

Author: Guest Blog by Naceredine Fares

The low permeability of tight sandstone means it is notoriously difficult to achieve a productive well economically. However, it has been demonstrated that Underbalanced Coiled Tubing Drilling (UBCTD) can provide an economically viable solution.


Let’s take the example of a tight sandstone field in the Middle East. The logs showed good gas levels that were worth exploiting.


The first attempt to extract was done conventionally, using overbalanced drilling. However, this led to production that was . . . 

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