Aplicação de sistemas microemulsionados ácidos em acidificação de poços

Stimulation operations have with main objective restore or improve the productivity or injectivity rate in wells. Acidizing is one of the most important operations of well stimulation, consist in inject acid solutions in the formation under fracture formation pressure. Acidizing have like main purpose remove near wellbore damage, caused by drilling or workover operations, can be use in sandstones and in carbonate formations. A critical step in acidizing operation is the control of acid-formation reaction. The high kinetic rate of this reaction, promotes the consumed of the acid in region near well, causing that the acid treatment not achive the desired distance. In this way, the damage zone can not be bypassed. The main objective of this work was obtain stable systems resistant to the different conditions found in field application, evaluate the kinetic of calcite dissolution in microemulsion systems and simulate the injection of this systems by performing experiments in plugs. The systems were obtained from two non ionic surfactants, Unitol L90 and Renex 110, with sec-butanol and n-butanol like cosurfactants. The oily component of the microemlsion was xilene and kerosene. The acqueous component was a solution of HCl 15-26,1%. The results shown that the microemulsion systems obtained were stable to temperature until 100ºC, high calcium concentrations, salinity until 35000 ppm and HCl concentrations until 25%. The time for calcite dissolution in microemulsion media was 14 times slower than in aqueous HCl 15%. The simulation in plugs showed that microemulsion systems promote a distributed flux and promoted longer channels. The permeability enhancement was between 177 - 890%. The results showed that the microemulsion systems obtained have potential to be applied in matrix acidizing

A poesia ibero-americana de José de Anchieta

El poeta José de Anchieta, a través de sus poesías, contribuyó para la formación de la literatura en suelo brasileño. Con eso, él proporcionó un encuentro entre los dos mundos lo Nuevo y lo Viejo, América y Europa representados en la unión entre los pares antagónicos que son constantes en la poética anchietana, como lo sagrado y lo profano, la muerte y la vida, lo simple y lo erudito. Su poética traduce, por lo tanto, las huellas de la antropofagia cultural, en que el indio y el blanco son uno sólo; el pagano y el cristiano, juntos, caminan para el centro de sus ideologías concebidas por la catequesis y por el popular. En esa amalgama entre las culturas, él construye un nuevo código cultural-lingüístico-literario, formando una nueva identidad para la tierra brasileña, abriendo las puertas para el barroco. Sus poemas están en cuatro lenguas: portugués, tupí, latín y español. Y de ese conjunto, nuestra disertación analiza el corpus en lengua española, que en el suelo americano deja de ser española y se vuelve ibero-americana. Como fuentes de estudio crítico-teórico, nos basamos, como ejemplos, en las obras de Haroldo de Campos, Severo Sarduy, Eugênio D Ors, Lezama Lima, Oswald de Andrade, Alfredo Bosi, Massaud Moisés. Así, esta disertación muestra, por el medio de la poesía iberoamericana de José de Anchieta el rasgo del inicio de nuestra literatura así como del barroco americano y, además, conjuga su poesía dentro del espacio de los Clásicos una vez que se comunica con estos desde el proceso de su producción. En esa intercomunicación, José de Anchieta promueve una apertura para la consciencia poética que hace parte de los grandes poetas de la Literatura Universal. Él une el Brasil, con sus matas vírgenes, con su primitivismo, al Mundo, con su censura desmedida ante la visión del Paraíso

Aplicação de sistemas microemulsionados ácidos em acidificação de poços

Stimulation operations have with main objective restore or improve the productivity or injectivity rate in wells. Acidizing is one of the most important operations of well stimulation, consist in inject acid solutions in the formation under fracture formation pressure. Acidizing have like main purpose remove near wellbore damage, caused by drilling or workover operations, can be use in sandstones and in carbonate formations. A critical step in acidizing operation is the control of acid-formation reaction. The high kinetic rate of this reaction, promotes the consumed of the acid in region near well, causing that the acid treatment not achive the desired distance. In this way, the damage zone can not be bypassed. The main objective of this work was obtain stable systems resistant to the different conditions found in field application, evaluate the kinetic of calcite dissolution in microemulsion systems and simulate the injection of this systems by performing experiments in plugs. The systems were obtained from two non ionic surfactants, Unitol L90 and Renex 110, with sec-butanol and n-butanol like cosurfactants. The oily component of the microemlsion was xilene and kerosene. The acqueous component was a solution of HCl 15-26,1%. The results shown that the microemulsion systems obtained were stable to temperature until 100ºC, high calcium concentrations, salinity until 35000 ppm and HCl concentrations until 25%. The time for calcite dissolution in microemulsion media was 14 times slower than in aqueous HCl 15%. The simulation in plugs showed that microemulsion systems promote a distributed flux and promoted longer channels. The permeability enhancement was between 177 - 890%. The results showed that the microemulsion systems obtained have potential to be applied in matrix acidizing