Applications of Underbalanced Drilling Reservoir Characterization for Water Shut Off in a Fractured Carbonate Reservoir

摘要

Following successful implementation of underbalancedrndrilling in Petroleum Development Oman (PDO) an evaluationrnof the value of underbalanced drilling (UBD) in a northernrncarbonate field was commissioned. The study showed thatrnthere was a production upside to developing the reservoir withrnUBD. A four-well trial campaign was conducted between Junernand October 2004 to assess the potential.rnThe trial campaign was implemented following a structuredrnprogram built from PDO’s previous experience. During thisrncampaign a Reservoir Characterization (RC) system allowingrnidentification of multiple high permeability features wasrndeveloped. Water shut-off devices were installed in two wellsrnbased upon the results of the Reservoir Characterisationrnsystem. Production in the four wells was equivalent to orrngreater than field average and the campaign scope has beenrnincreased. The campaign was also a stepping stone towardsrnthe goal of integrating UBD, Reservoir Characterization andrnwater shut off techniques.