Control of the produced water scaling potential: an example from the Halfdan field (North Sea)
Author
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Pages
87
Abstract
Scale formation has been considered a major problem in the oil and gas industry. The mineral precipitation can pose a serious threat to oil and gas production both at a surface (production facilities) and subsurface (reservoir and near- wellbore region) level. The scale deposition can result in a decreased production and end up in well loss. The current research investigated the scale potential associated to the an offshore produced water sample (Halfdan field - North Sea) if exposed to two different formation waters (Ekofisk and Valhall) at 70ºC. The coreflooding experiments at constant flow-rate have demonstrated the occurrence of porosity reduction (ca. 1.3\% in one of the cases) and permeability decrease, approximately 0.017 D in both cases. Moreover, the experimental results have indicated the possibility of barite precipitation, tendency for potassium, carbonate and bicarbonate ions retention and localized phosphate dissolution.
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