Made available in DSpace on 2014-12-17T14:08:30Z (GMT). No. of bitstreams: 1 EdneyRVPG.pdf: 3193441 bytes, checksum: 9108a5643f51fcfe4a8b7479be215c58 (MD5) Previous issue date: 2008-08-18 / Currently a resource more and more used by the petroleum industry to increase the efficiency of steam flood mechanism is the addition of solvents. The process can be understood as a combination of a thermal method (steam injection) with a miscible method (solvent injection), promoting, thus, the reduction of interfacial tensions and oil viscosity. The use of solvent alone tends to be limited because of its high cost. When co-injected with steam, the vaporized solvent condenses in the cooler regions of the reservoir and mixes with the oil, creating a zone of low viscosity between the steam and the heavy oil. The mobility of the displaced fluid is then improved, resulting in an increase of oil recovery. To better understand this improved oil recovery method, a numerical study of the process was done contemplating the effects of some operational parameters (distance between wells, injection steam rate, kind of solvent and injected solvent volume)on the accumulated production of oil, recovery factor and oil-steam rate. Semisynthetic models were used in this study but reservoir data can be extrapolated for practical applications situations on Potiguar Basin. Simulations were performed in STARS (CMG, 2007.11). It was found that injected solvent volumes increased oil recovery and oil rates. Further the majority of the injected solvent was produced and can be recycled / Um recurso cada vez mais utilizado pela ind?stria petrol?fera para aumentar a efici?ncia do mecanismo de inje??o de vapor ? a adi??o de solventes. O processo pode ser compreendido como a combina??o de um m?todo t?rmico (inje??o de vapor) com um m?todo misc?vel (inje??o de solvente), promovendo, dessa forma, a redu??o das tens?es interfaciais e da viscosidade do ?leo. O uso do solvente sozinho tende a ser limitado, em fun??o do seu alto custo. Quando coinjetado com o vapor, o solvente vaporizado condensa nas regi?es menos quentes do reservat?rio e mistura-se ao ?leo, criando uma zona de baixa viscosidade entre o vapor e o ?leo pesado. A mobilidade do fluido deslocado ? ent?o melhorada, implicando num aumento do fator de recupera??o. Para melhor compreender esse mecanismo de recupera??o avan?ada, foi realizado um estudo num?rico, onde se verificou a sensibilidade de alguns par?metros operacionais (dist?ncia entre po?os, vaz?o de inje??o de vapor, tipo de solvente injetado e quantidade de solvente) sobre a produ??o acumulada de ?leo, o fator de recupera??o e a raz?o ?leo-vapor. Neste estudo, foram utilizados modelos semi-sint?ticos, por?m com dados de reservat?rio que podem ser extrapolados para situa??es de aplica??es pr?ticas na Bacia Potiguar. As simula??es foram realizadas no m?dulo STARS (Steam, Thermal, and Advanced Processes Reservoir Simulator) do programa da CMG (Computer Modelling Group), vers?o 2007.11. Os resultados mostraram que a presen?a do solvente nas quantidades analisadas melhorou os fatores de recupera??o e as vaz?es de ?leo. Al?m disso, a maior parte do solvente injetado foi produzido, podendo ser reciclado

Made available in DSpace on 2014-12-17T14:08:34Z (GMT). No. of bitstreams: 1 DayanaLSpdf.pdf: 1986697 bytes, checksum: 096c92db6f636c1bab0aeee590522e53 (MD5) Previous issue date: 2009-07-31 / Petr?leo Brasileiro SA - PETROBRAS / Currently, due to part of world is focalized to petroleum, many researches with this theme have been advanced to make possible the production into reservoirs which were classified as unviable. Because of geological and operational challenges presented to oil recovery, more and more efficient methods which are economically successful have been searched. In this background, steam flood is in evidence mainly when it is combined with other procedures to purpose low costs and high recovery factors. This work utilized nitrogen as an alternative fluid after steam flood to adjust the best combination of alternation between these fluids in terms of time and rate injection. To describe the simplified economic profile, many analysis based on liquid cumulative production were performed. The completion interval and injection fluid rates were fixed and the oil viscosity was ranged at 300 cP, 1.000 cP and 3.000 cP. The results defined, for each viscosity, one specific model indicating the best period to stop the introduction of steam and insertion of nitrogen, when the first injected fluid reached its economic limit. Simulations in physics model defined from one-eighth nine-spot inverted were realized using the commercial simulator Steam, Thermal and Advanced Processes Reservoir Simulator STARS of Computer Modelling Group CMG / Atualmente, pelo fato de parte do mundo estar voltada para a ind?stria do petr?leo, as pesquisas na ?rea t?m avan?ado de modo a tornar poss?vel at? mesmo a produ??o em reservat?rios at? ent?o vistos como invi?veis. Em virtude dos desafios geol?gicos e operacionais apresentados para recuperar o ?leo, cada vez mais se intensifica a busca por m?todos mais eficientes e lucrativos. Neste cen?rio, a inje??o de vapor merece destaque, sobretudo, quando combinada com outros procedimentos visando assim, reduzir os custos, ao mesmo tempo em que aumenta o fator de recupera??o. O presente trabalho utilizou o nitrog?nio como fluido alternativo ap?s a inje??o de vapor a fim de ajustar a melhor combina??o de altern?ncia desses fluidos em termos do tempo e vaz?o de inje??o. Para tra?ar um perfil econ?mico simplificado do processo, realizaram-se an?lises com base na produ??o acumulada l?quida. O intervalo de completa??o e as vaz?es dos fluidos de inje??o foram fixados e variou-se a viscosidade do ?leo em 300 cP, 1.000 cP e 3.000 cP. Os resultados definiram, para cada viscosidade, um modelo espec?fico indicando o melhor per?odo para interrup??o do vapor e inser??o do nitrog?nio, quando o primeiro fluido injetado atingiu seu limite econ?mico. As simula??es foram realizadas em um modelo f?sico definido a partir de 1/8 (um oitavo) do padr?o nine-spot invertido, utilizando o simulador comercial Steam, Thermal and Advanced Processes Reservoir Simulator STARS do Computer Modelling Group CMG