We carried out a screening study for a small potential offshore HPHT development in the Central Graben of the UKCS. A range of potential reserves outcomes were consider from 10 million barrels and 36 billion standard cubic feet through 40 million barrels and 144 billion standard cubic feet. A key element of the study was to assess whether an economic justification could be developed for low reserves cases that under pinned the case for further appraisal drilling. The development and operating cost estimates were generated using our NETCO$TER Cost Evaluation Software.