Abstract
Abstract The Kvitebjørn medium rich gas condensate field in the Norwegian North Sea is characterized as a high pressure high temperature (HPHT) reservoir with 770.5 bar pressure and 150°C temperature at about 4000 m TVD MSL. Despite high temperature and depth, the average reservoir properties are reasonably good. The main reservoir is Brent Group of Middle Jurassic age which is extensively faulted. One of the main challenges is the drilling in depleted reservoir. The strategy to mitigate the problem has been to put the field on reduced production and/or to actively manage reservoir pressure by producing more from areas far away from the drilling locations. Advanced drilling technologies have also been developed to improve drillability. Several improved oil/gas recovery methods are currently under consideration, which include infill drilling, process capacity upgrading, low pressure-production and gas recycling. Infill drilling is challenging due to reservoir depletion. Capacity upgrading is to be implemented to expedite hydrocarbon recovery. Gas recycling has some potential for improved condensate recovery, but the project economy is poor. Low pressure production appears to be a very attractive option. A compressor concept has been selected based on thorough evaluation of space and weight limitations on the platform, possibility for future drilling and intervention operations, explosion hazard, tie-in of other prospects and future export facilities etc. Subsurface challenges include uncertainties related to well integrity and productivity, reservoir communication, reservoir volumes, etc. The purpose of this paper is to present the challenges related to development and management of this HPHT gas condensate reservoir, the strategies to overcome the challenges and the methods to improve gas and condensate recoveries from this field with special focus on the low pressure production and gas recycling.
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