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Previous issue date: 2016-08-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / As rochas naturais usadas em ensaios de recupera??o avan?ada de petr?leo apresentam alto custo de obten??o, s?o anisotr?picas e, al?m disso, h? a necessidade de realiza??o de v?rios ensaios para estudos detalhados de algum m?todo de recupera??o avan?ada. Por esta causa, este estudo consistiu na obten??o de arenitos sint?ticos feitos a partir de areia da praia e argila cer?mica que tivessem propriedades semelhantes ?s de rochas naturais. Para isto, variaram-se a concentra??o de argila (20 a 40%, em massa), a press?o de compacta??o (100 a 200 kgf/cm2) e a temperatura de sinteriza??o (850 a 950 ?C) e foi feito um planejamento fatorial 23 com triplicata no ponto central, com o aux?lio do software Statistica 8.0. Tamb?m foram realizadas an?lises de composi??es qu?mica e mineral?gica dos materiais, de reologia dos fluidos e de recupera??es convencionais de petr?leo. Os resultados mostraram que aumentos na press?o de compacta??o, concentra??o de argila e a redu??o da temperatura causam redu??o da porosidade e permeabilidade e aumento na resist?ncia ? compress?o uniaxial. Os modelos gerados para estas vari?veis-resposta s?o significativos e preditivos, descrevendo satisfatoriamente o conjunto de dados, os quais tiveram boa reprodutibilidade. O arenito sint?tico AS 10 foi escolhido para os ensaios de recupera??es convencionais de petr?leo por apresentar maior resist?ncia ? compress?o uniaxial e por ter permeabilidade semelhante ? do arenito Berea, o mais usado em ensaios de recupera??o avan?ada em todo o mundo. Os ensaios de recupera??es convencionais com o AS 10 mostraram a rela??o inversa entre a viscosidade do petr?leo e o fator de recupera??o. Al?m disso, os fatores de recupera??es convencionais ficaram pr?ximos aos de ensaios com arenitos naturais que usaram petr?leo com viscosidade semelhante. / The natural rocks used for studying enhanced oil recovery (EOR) are expensive to acquire and are also anisotropic. Moreover, any detailed study on enhanced recovery requires several tests. For those reasons, this work consisted on obtaining synthetic sandstones composed of beach sand and ceramic shale, both with properties similar to those found in natural rocks. In order to do so, variations were performed on shale concentration (from 20 to 40% in weight), on compaction pressure (from 100 to 200 kgf/cm2) and on syntherization temperature (from 850 to 950 ?C), and a 2? factorial design with centerpoint triple replicates was done, using the Statistica 8.0 software. Experiments aiming to analyse the material chemical and mineralogical compositions, the fluids rheology and the conventional oil recovery were also performed. The results showed that increases in compaction pressure and in shale concentration and decreases in temperature lead to decreases in porosity and permeability and to increases in resistance to uniaxial compression. The models generated to theses response variables are meaningful and predictive, describing accurately the data, which presented a good reproducibility. The AS 10 synthetic sandstone was used for the conventional oil recovery experiments mainly for having the greatest resistance to uniaxial compression and for displaying permeability similar to the Berea sandstone, which is the most used in enhanced recovery worldwide. The conventional oil recovery experiments using the AS 10 showed the inverse relationship between oil viscosity and recovery factor. Furthermore, the conventional recovery factors found were similar to those from natural sandstone performed with oil having a similar viscosity.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21980 |
| Date | 26 August 2016 |
| Creators | Costa, Semuel Eben?zer Dantas |
| Contributors | 59545844434, Dantas Neto, Afonso Avelino, 05641284491, Santos, Francisco Klebson Gomes dos, 00779263405, Santos, Joselisse Soares de Carvalho, 04854288493, Barros Neto, Eduardo Lins de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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