Nova técnica para obtenção de fraturas com altíssima condutividade em poços de petróleo

Increase hydrocarbons production is the main goal of the oilwell industry worldwide. Hydraulic fracturing is often applied to achieve this goal due to a combination of attractive aspects including easiness and low operational costs associated with fast and highly economical response. Conventional fracturing usually involves high-flowing high-pressure pumping of a viscous fluid responsible for opening the fracture in the hydrocarbon producing rock. The thickness of the fracture should be enough to assure the penetration of the particles of a solid proppant into the rock. The proppant is driven into the target formation by a carrier fluid. After pumping, all fluids are filtered through the faces of the fracture and penetrate the rock. The proppant remains in the fracture holding it open and assuring high hydraulic conductivity. The present study proposes a different approach for hydraulic fracturing. Fractures with infinity conductivity are formed and used to further improve the production of highly permeable formations as well as to produce long fractures in naturally fractured formations. Naturally open fractures with infinite conductivity are usually encountered. They can be observed in rock outcrops and core plugs, or noticed by the total loss of circulation during drilling (even with low density fluids), image profiles, pumping tests (Mini-Frac and Mini Fall Off), and injection tests below fracturing pressure, whose flow is higher than expected for radial Darcian ones. Naturally occurring fractures are kept open by randomly shaped and placed supporting points, able to hold the faces of the fracture separate even under typical closing pressures. The approach presented herein generates infinite conductivity canal held open by artificially created parallel supporting areas positioned both horizontally and vertically. The size of these areas is designed to hold the permeable zones open supported by the impermeable areas. The England & Green equation was used to theoretically prove that the fracture can be held open by such artificially created set of horizontal parallel supporting areas. To assess the benefits of fractures characterized by infinite conductivity, an overall comparison with finite conductivity fractures was carried out using a series of parameters including fracture pressure loss and dimensionless conductivity as a function of flow production, FOI folds of increase, flow production and cumulative production as a function of time, and finally plots of net present value and productivity index

Ser-tão de Buriti: o corpo de noturno rumor (a poética de Guimarães Rosa e o pensamento literário contemporâneo)

This thesis is to analyze the fictional texture of Buriti, novella by Guimarães Rosa, which makes part of Corpo do Baile. Gilles Deleuze‘s philosophical background as well as similar theorists such as Mircea Eliade, Derrida, Bataille, Foucault, Blanchot and Nie-tzsche constitute the main reference, as example of Guimarães Rosa‘s problematizing writing, since they present as basic element of thought the desterritorialization of con-cepts, standards and institutionalized knowledge by the dominant literary language. Along with the theoretical perspective of current alterity on these authors, Buriti is crossed by one aesthetics substantiated with a multiplicity of narrative points of view, opening gaps to other non-sacralized, nomadic voices, using polyphony as a way of breaking and destabilizing crystallized truths related to the canons of mother tongue. Interwoven by a poetic side of transgression, the narrative of Buriti finds especially marked by the signs of the backlands and of the night, which rhizomatically point to a sense of infinity, eternity, loneliness, vertigo before the abyssal, evoking the singularity of a ser-tão before the night, "the body of nocturnal rumor." The nights in the backlands in Buriti give rise to the emergence of a state of subjectivity, the ser-tão, whose nature is shown as a space of communion of the various beings that humans put on the same level of other living beings, setting up a sharing cosmic territory, enjoyment between pain and pleasure, between death and life. It is the night in the darkness, the shadows, the ser-tão is exposed, the being in his depth, facing himself with his internal rumors, which project themselves through the noise, the sound amplified by the vastness of the night at the desert backlands. "The backlands is the night." (ROSA, 1988, p.92).

Ser-tão de Buriti: o corpo de noturno rumor (a poética de Guimarães Rosa e o pensamento literário contemporâneo)

This thesis is to analyze the fictional texture of Buriti, novella by Guimarães Rosa, which makes part of Corpo do Baile. Gilles Deleuze‘s philosophical background as well as similar theorists such as Mircea Eliade, Derrida, Bataille, Foucault, Blanchot and Nie-tzsche constitute the main reference, as example of Guimarães Rosa‘s problematizing writing, since they present as basic element of thought the desterritorialization of con-cepts, standards and institutionalized knowledge by the dominant literary language. Along with the theoretical perspective of current alterity on these authors, Buriti is crossed by one aesthetics substantiated with a multiplicity of narrative points of view, opening gaps to other non-sacralized, nomadic voices, using polyphony as a way of breaking and destabilizing crystallized truths related to the canons of mother tongue. Interwoven by a poetic side of transgression, the narrative of Buriti finds especially marked by the signs of the backlands and of the night, which rhizomatically point to a sense of infinity, eternity, loneliness, vertigo before the abyssal, evoking the singularity of a ser-tão before the night, "the body of nocturnal rumor." The nights in the backlands in Buriti give rise to the emergence of a state of subjectivity, the ser-tão, whose nature is shown as a space of communion of the various beings that humans put on the same level of other living beings, setting up a sharing cosmic territory, enjoyment between pain and pleasure, between death and life. It is the night in the darkness, the shadows, the ser-tão is exposed, the being in his depth, facing himself with his internal rumors, which project themselves through the noise, the sound amplified by the vastness of the night at the desert backlands. "The backlands is the night." (ROSA, 1988, p.92).

Nova técnica para obtenção de fraturas com altíssima condutividade em poços de petróleo

Increase hydrocarbons production is the main goal of the oilwell industry worldwide. Hydraulic fracturing is often applied to achieve this goal due to a combination of attractive aspects including easiness and low operational costs associated with fast and highly economical response. Conventional fracturing usually involves high-flowing high-pressure pumping of a viscous fluid responsible for opening the fracture in the hydrocarbon producing rock. The thickness of the fracture should be enough to assure the penetration of the particles of a solid proppant into the rock. The proppant is driven into the target formation by a carrier fluid. After pumping, all fluids are filtered through the faces of the fracture and penetrate the rock. The proppant remains in the fracture holding it open and assuring high hydraulic conductivity. The present study proposes a different approach for hydraulic fracturing. Fractures with infinity conductivity are formed and used to further improve the production of highly permeable formations as well as to produce long fractures in naturally fractured formations. Naturally open fractures with infinite conductivity are usually encountered. They can be observed in rock outcrops and core plugs, or noticed by the total loss of circulation during drilling (even with low density fluids), image profiles, pumping tests (Mini-Frac and Mini Fall Off), and injection tests below fracturing pressure, whose flow is higher than expected for radial Darcian ones. Naturally occurring fractures are kept open by randomly shaped and placed supporting points, able to hold the faces of the fracture separate even under typical closing pressures. The approach presented herein generates infinite conductivity canal held open by artificially created parallel supporting areas positioned both horizontally and vertically. The size of these areas is designed to hold the permeable zones open supported by the impermeable areas. The England & Green equation was used to theoretically prove that the fracture can be held open by such artificially created set of horizontal parallel supporting areas. To assess the benefits of fractures characterized by infinite conductivity, an overall comparison with finite conductivity fractures was carried out using a series of parameters including fracture pressure loss and dimensionless conductivity as a function of flow production, FOI folds of increase, flow production and cumulative production as a function of time, and finally plots of net present value and productivity index