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Heterogenous Precipitation of Barium Sulphate - Dependence of Pressure and Electrical Fields
Speciale, 3. modul, 2013, id:284
Vejleder:Tage Christensen, John Mortensen og Niels Falkenberg
Findes på RUb:Ja
English abstract
Scaling in oil fields gives rise to major problems with both restriction of the flow and blocking of important infrastructure such as vents. This study examines the possibilities for non-chemical inhibition of the scaling salt barium sulphate. The first part of the study investigates the effect of a static electrical field on the precipitation of barium sulphate onto a copper surface. Experiments were carried out in a copper pipe. A potential difference was applied between a silver electrode inserted into the pipe and the pipe itself. The results here were not within a statistically significant region to say anything conclusive. But a tendency did seem to form that with a positive potential on the copper pipe in relation to the silver electrode inside the fluid precipitated a little less onto the pipe. The second part of the study considered the pressure profile around different geometries in a pipe. This was done by modeling in COMSOL. Both a laminar flow model and a turbulent flow model were considered. The pressure profiles were then compared to earlier studies on the solubility of barium sulphate at different pressures. This showed that constrictions in the pipe gave a lower pressure near the wall in the middle of the construction, this was most significant in turbulent flow models with pressure drops up to around 1000 Pa. During laminar flow the changes in pressure were so small, the largest drop achieved being 0.06 Pa, that no scaling is assumed to take place, whereas during turbulent flow the pressure differences were larger and scaling may occur.

Database opslag den: 25-01-2021