Banca de QUALIFICAÇÃO: ERIKA CRISTINA LOURENCO DE OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ERIKA CRISTINA LOURENCO DE OLIVEIRA
DATA : 08/02/2018
HORA: 15:30
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:

“MODELING AND SIMULATION OF THE WAX SOLUBILIZATION IN PIPES AND WELLS AND DEPOSITION OF THE WAX IN TUBES IN LAMINAR AND TURBULENT REGIME”

PALAVRAS-CHAVES:

Solubilization, deposition, wax, Solid-Liquid equilibrium, modeling, simulation

PÁGINAS: 215
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Crude oil is a complex mixture of saturated, paraffinic, aromatic hydrocarbons, asphaltenes and resins. In the reservoir conditions, these compounds are totally solubilized in the crude oil and as it flows to the surface, the oil begins to undergo modifications in the conditions of temperature and pressure, causing in the appearance of solid crystals, the breakage of this equilibrium occurs due to the cooling and the depressurising that the petroleum undergoes during its elevation and transport. These precipitates, which are mostly formed by waxs, eventually limit the flow area, being one of the major factors responsible for problems related to the transport of oil, such as obstructions in the transport ducts and production wells.

Aiming to study the process of the wax solubilizing in ducts and wells, as well as the process of the wax deposition in ducts in the various types of flow, this work want to develop a computational program in a development environment VBA for Excel®, able to simulate these processes under various conditions, using of mathematical models that represent the process, based on the phenomena involved such as mass transfer, energy transfer and solid-liquid equilibrium.

The work was developed in four steps: i) modeling the heat and mass transfer phenomena, ii) modeling the routine of the activity coefficients through the UNIFAC model and the solid-liquid equilibrium system modeling; iii) mathematical modeling of the solubilization and deposition process, as well as calculation of the paraffin thickness over time; iv) implementation of the models in a VBA for Excel® development environment and creation of a graphical interface to simulate the process of solubilization and deposition of paraffin in ducts and solubilization of paraffin in wells. It was possible to verify that the simulator was proportional and satisfactory to the expected results, where it was possible to evaluate the influence of each variable studied (Flow, Inlet Temperature, External Temperature, Carbonic Solvent Chain) under different operating conditions.

MEMBROS DA BANCA:
Interno - 1543286 - CAMILA GAMBINI PEREIRA
Presidente - 1308273 - EDUARDO LINS DE BARROS NETO
Externo ao Programa - 1679234 - JENNYS LOURDES MENESES BARILLAS
Externo ao Programa - 1149372 - TARCILIO VIANA DUTRA JUNIOR