Abstract
Elemental mercury (Hg0) is a safety hazard for some materials and could therefore impact material specifications as well as general process design. Knowledge of Hg0 concentration in reservoir fluids is therefore desired early in the field development phase. In practice one must either rely on measurements from exploration wells or use some kind of model or analogues to estimate a Hg0 concentration in the reservoir fluid at question. The objective of this study was firstly to analyze available data from around 190 wells on the Norwegian Continental Shelf (NCS) to determine whether measurements from exploration wells were consistent with data from fields in operation. Secondly, the aim was to compose a workflow for determining which data to rely on when specifying a Hg concentration to use for new developments. Across NCS the scatter proved very large with no clear trends. Based on the present work it is recommended to trust the highest observed value from the gas phase measurements when evaluating Hg0 analyses from reservoir sampled fluids.
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