This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 101491, "An Approach for Production-Enhancement Opportunities in a Brownfield Redevelopment Plan," by Antonio Cuauro, SPE, Schlumberger; Mohd Izat Ali, SPE, and Maharon Bin Jadid, SPE, Petronas Carigali Sdn. Bhd.; and Ekrem Kasap, SPE, (now with Shell E&P) and Torsten Friedel, SPE, Schlumberger, prepared for the 2006 SPE Russian Oil and Gas Technical Conference and Exhibition, Moscow, 3–6 October. The Betty oil field was discovered in 1968 and has produced since 1978. With the objective of rejuvenating the asset, a multidisciplinary optimization team was built. The standard practices to evaluate production-enhancement opportunities include logging, nodal analysis, and well-engineering technologies. Usually, the older the field, the more challenging it is to achieve additional reserves. The full-length paper outlines an integrated approach for achieving these objectives, reducing the risk associated with the various enhancement alternatives. Introduction Brownfields have been defined as mature fields with declining production or at the end of their productive lives. Such fields contain resources that are needed by the countries they belong to and by the world economy. These brownfields generally are more than 30 years old and account for 67 to 72% of world production. The Betty field was discovered in 1968 by the Betty-1 well, 25 miles offshore from Lutong, Malaysia, in the Baram Delta. A 24-slot drilling platform was installed in 1978, from which nine development wells were drilled. Two other structures house the separation facilities and a flare boom. Three "revisit" campaigns were con-ducted on the Betty field. The first, in 1984, drilled five additional wells. The second campaign, in 1988, drilled 10 additional wells and worked over two existing wells. The third revisit was in 1994, to sidetrack four wells. There are eight reservoirs that have been targeted and produced. All of the wells are dual-string completions with two or more perforated intervals. With the objective of rejuvenating the field, Petronas Carigali and Schlumberger joined forces to improve recovery from this mature field. A multidisciplinary team was assembled, and the collective approach to meet this objective focused on engineering and geology. Production enhancement involves several techniques to improve well performance, such as fracturing, acidizing, perforating, and artificial lift. The way to achieve the maximum productivity of a well is determined by the quality and quantity of data for that well. Because field-development plans involve multiple objectives, the full-length paper details the well-engineering part, focusing on production-enhancement strategies. Determination of the estimated ultimate recovery (EUR) and the location of these reserves used both numerical simulation and nodal analysis, which are key to this integrated approach. The integrated approach was used to reduce uncertainties and risks associated with proposed activities.