Producing well water samples from the Prudhoe Bay Eastern Operating Area were evaluated with respect to the fraction of seawater in the sample. The evaluation demonstrated that the previous method of using magnesium or sulfate to determine percent seawater was in error. Because the water contains acetic acid, which was titrated as bicarbonate, scaling calculations overpredicted calcium carbonate scale formation.

The data show that there are at least two different waters in Prudhoe Bay. Additionally, potential reservoir mechanisms driving chemical reactions were identified as cation exchange (fines migration), scale precipitation (calcium carbonate, barium sulfate), formation dissolution and metabolic conversion of sulfate (leading to iron sulfide precipitation).

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