Nombre: RODRIGO SIMÕES MACIEL
Tipo: MSc dissertation
Fecha de publicación: 31/05/2017
Supervisor:
Nombre |
Rol |
|---|---|
| FABIO DE ASSIS RESSEL PEREIRA | Advisor * |
Junta de examinadores:
| Nombre |
Rol |
|---|---|
| DANIEL DA CUNHA RIBEIRO | Internal Alternate * |
| FABIO DE ASSIS RESSEL PEREIRA | Advisor * |
| RENATO DO NASCIMENTO SIQUEIRA | External Examiner * |
| SANDRA MARA SANTANA ROCHA | External Examiner * |
Resumen: Due to the hydrocarbons demand increase, it was necessary to seek this resource in increasingly complex exploration horizons. The challenge of managing production intelligently and efficiently is inherent in the development of techniques, procedures and tools applicable to oil exploration and production. Among these challenges is flow assurance, more specifically the saline incrustations problems, such as the calcite deposition. The calcite tends to precipitate due the imbalance in the following chemical reaction: Ca+2(aq)+2HCO3-(aq) ⟷ CaCO3(s)+ H2O+CO2(g). The pressure decrease and heat transfer inherent to the flow in the completion elements, facilitates the removal of CO2 from the solution, allowing the shift of chemical equilibrium to the direction that favors the precipitation of CaCO3(s). Under certain circumstances, those solids may partially or completely blocks the production flow. Using computational fluid dynamic (CFD), design of experiments and statistical analysis, the fluid dynamic of an incrustation test device is analyzed. Initially, some operational and geometric conditions which optimizes the test device operation are detected, on the search of the best condition that minimize the global pressures loss and the relationship between these factors with respect to the calcium carbonate crystals transportation to the internal surfaces. It was observed that the operational and geometrical variables optimization is very relevant to minimize pressure loss. For instance, a pressure difference of 24,52 atm occurs between the simulated cases that results in higher and lower pressure loss. In general, the pressure differential minimization is mainly associated with: lower average velocities at the entrance of the control volume, greater number of connections in the TRIM region, presence of chamfer at the entrance of this region with a slope between 40 ° and 70 ° and lower viscosity fluids.
