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After drilling anexploration well in the Cygnus Field of the UK North Sea, a major operator began investigating an extension of the main accumulation into a new fault block. The primary reservoir target was the Lower Leman sandstone consisting of aeolian sands with mobility between 0.1 and 100 mD/cP. One of the operator’s main objectives with this well was to examine pressure communication within the main Cygnus Field and the possibility of a common free water level (FWL)—in low-mobility reservoirs it can be extremely difficult to acquire useable pressure data and capture single-phase samples with low contamination levels.
RCX XE North Sea Case Study.pdf