Underbalanced drilling helps PDO find gas in tight reservoir after 11 unsuccessful conventionally drilled wells In the article, John and his co-authors describe the challenges and ultimate success of using underbalanced drilling techniques to prove the presence and mobility of hydrocarbons in the exploration of a deep, high pressure tight gas reservoir.
The well drilled underbalanced in the Fahud Salt Basin resulted in "the most direct and unequivocal reservoir evaluation in any of the tight-gas wells of North Oman."