Mature-Field Rejuvenation of a Tight Gas Carbonate Utilizing Coiled-Tubing Underbalanced-Drilling Techniques

摘要

The Margham Dubai Establishment (MDE) asset is a mature gas-condensate field that was put on production in 1985.As the energy demands of Dubai are ever increasing,MDE has been releasing (net) gas resulting in rapid dwindling of remaining reserves.In order to reduce the amount of alternate fuels required to meet the Dubai energy demands,MDE initiated a drastic field intervention campaign prior to June 1,2006.Preliminary feasibility studies concluded that the only identified practical option of increasing drainage capacity was to re-enter existing wells drilling high deviation multi-laterals with coiled-tubing,underbalanced drilling (CTUBD) techniques.After approximately three months of rigorous project planning and engineering,the well sequence of Phase I was initiated (4 wells).Upon completion,a 73% net increase (including average field decline) of gas from the Margham field was observed equating to a gas lift cost of less than