Underbalanced drilling in a depleted gasfield onshore UK with coiled turbing and stable foam

摘要

Drillign a sidtrack into a severely depleted gas reservoir is a chalklenge tha tan be safely completed susing underbalanced drillign technolgy.Smedvig Offshore completed a sidetrack in a depleted gas reservoir onshore using a rig and a coiled tubin drillign system.A short plannign time,a lack of available equipment combined with a restricted operating window and a low budget made this well a challenging project.