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Previous issue date: 2016-03-22 / Um dos desafios na acidifica??o de po?os em forma??es carbon?ticas ? o controle da rea??o de dissolu??o do carbonato de c?lcio. Devido a elevada taxa de rea??o entre o ?cido clor?drico (HCl) e a forma??o, o HCl ? todo consumido na regi?o da forma??o pr?xima ao po?o de maneira que as zonas mais profundas n?o s?o alcan?adas e as regi?es de dano podem n?o ser ultrapassadas. Diversos sistemas foram desenvolvidos para retardar a rea??o de dissolu??o, incluindo a utiliza??o de ?cidos org?nicos, sistemas viscosos e emulsionados. Contudo, poucos estudos reportam a utiliza??o de sistemas microemulsionados como sistemas retardados. Neste trabalho foram estudados sistemas microemulsionados ?cidos do tipo ?leo em ?gua para aplica??o em acidifica??o de carbonatos e limpeza de po?o. O trabalho foi dividido em duas etapas principais, sendo elas: a obten??o e caracteriza??o dos sistemas; e a avalia??o da efici?ncia realizando experimentos de inje??o em plugues de rocha carbon?tica. Para formula??o dos sistemas microemulsionados, dois ?cidos foram utilizados: o ?cido clor?drico (HCl); e o ?cido etilenodiamino tetra-ac?tico (EDTA). O tensoativo utilizado foi o ALK L90 (n?o i?nico), o sec-butanol como co-tensoativo e o xileno como componente org?nico. Foram obtidos sistemas microemulsionados ?cidos com HCl e com EDTA. Os resultados mostraram que a adi??o de ?cidos em determinadas condi??es promove a transi??o de fases dos sistemas de microemuls?o. Os ensaios de inje??o mostraram que os sistemas microemulsionados ?cidos propostos foram eficientes em estimular os plugues de forma??o carbon?tica, alcan?ando incrementos na permeabilidade entre 10-30%, sem apresentar dissolu??o na face e formando wormholes. / One of the challenges in acidification of wells in carbonate formations is controlling the dissolution reaction of calcium carbonate. Due to the high rate of reaction between hydrochloric acid (HCl) and the rock formation, the HCl is all consumed close to the wellbore region. In this way, the deeper areas are not reached and the damage regions may not be exceeded. Several systems have been developed to retard the dissolution reaction, including the use of organic acids, viscous emulsion systems, and the use of chelating agents. However, few studies have reported the use of microemulsion systems as retarded acid systems. In this work, oil in water acid microemulsions are studied for use in carbonate acidizing. The work was divided into two main stages. The first stage was the obtaining and the characterizing of the systems and the second one was the efficiency evaluation by performing injection experiments in carbonate cores. Two microemulsion systems were obtained, one using the hydrochloric acid (HCl) and the second using the ethylenediaminetetraacetic acid (EDTA), a chelating agent. The surfactant used was the ALK-L90 (non-ionic), sec-butanol was used as a co-surfactant, and xylene as the organic component. The results showed that the addition of the HCl or chelating agent promotes the transition of the phase of microemulsion system. Wettability studies showed that the microemulsion systems obtained have a greater power of interaction with the carbonate than the aqueous solutions and also the microemulsion systems without addition of HCl or EDTA. The coreflood experiments showed that the microemulsion systems obtained were effective in stimulating the carbonate cores, achieving increases in permeability up to 86% without showing core face dissolution. The HCl and EDTA corrosiveness in microemulsion media was 80% less than in the aqueous solution. The microemulsion systems obtained can be a promising candidate to use as alternative fluids to carbonate stimulation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21437 |
| Date | 22 March 2016 |
| Creators | Aum, Pedro Tup? Pandava |
| Contributors | 07286937391, http://lattes.cnpq.br/0676872399141537, Dantas Neto, Afonso Avelino, 05641284491, http://lattes.cnpq.br/2174051551046465, Fernandes, Manoel Reginaldo, 96868732449, http://lattes.cnpq.br/4396362216028363, Rodrigues, Marcos Allyson Felipe, 04575614408, http://lattes.cnpq.br/5453593230706116, Moura, Maria Carlenise Paiva de Alencar, 21414130368, http://lattes.cnpq.br/3613318563806519, Dantas, Tereza Neuma de Castro |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE PETR?LEO, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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