DEPOSIÇÃO DE PARAFINA EM ESCOAMENTO LAMINAR NA PRESENÇA DE CRISTAIS EM SUSPENSÃO / WAX DEPOSITION IN LAMINAR FLOW WITH SUSPENDED CRYSTALS

AUTOR(ES)

JOSE LUIS PLASENCIA CABANILLAS

DATA DE PUBLICAÇÃO

2006

RESUMO

Offshore crude oil production is steadily growing. Oil transport in these cold environments (deep water) causes the precipitation of the heavy organic crude oil components like waxes. Wax deposition at the inner wall of pipelines is a serious problem in crude oil transportation causing the partial or total plugging of pipelines, increase in pumping energy and a high cost of maintenance that is proportionally greater as development depth increases. A literature research conducted in the present work leads to the conclusion that the relative importance of the wax deposition mechanisms is still misunderstood. The importance of this knowledge will result in more accurate prediction of paraffin deposition rates that would be very important to sub sea pipelines maintenance and design. The philosophy of this work is to make simple experiments with known fluid properties and well controllable conditions trying to understand the importance and relevance of each known fouling mechanism. Hence, wax deposition experiments were performed in laminar flow for different temperature conditions with a single-phase paraffin-oil mixture, having the particle migration visualization in mind. Experiments with oil mixture injection temperature below the Wax Appearance Point (with wax crystals flowing) have shown that it is necessary a negative heat flux to produce significant deposition. For positive and zero heat fluxes there was no deposition visualized. Also, the unsteady fouling state for negative heat flux was followed and their temporal deposition profiles measured for different Reynolds and temperature conditions. Those temporal and dimensional deposition profiles are original important information to be compared with numerical simulation.

ASSUNTO(S)

submarine pipelines deposicao de parafina dutos submarinos wax deposition

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