Inhibición del daño de formación por precipitación de asfaltenos en la zona cercana al pozo, mediante el uso de nanopartículas de sílice en el fluido de perforación
During the production processes of a hydrocarbon field, the crude undergoes changes in pressure and temperature, especially in areas near the well where the washed area (area with alteration of petrophysical properties and / or presence of drilling fluids) generates a drop in additional pressure. Cr...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | Colombia |
| Institución: | Universidad Nacional de Colombia |
| Repositorio: | Repositorio UN |
| Idioma: | español |
| OAI Identifier: | oai:repositorio.unal.edu.co:unal/78646 |
| Acceso en línea: | https://repositorio.unal.edu.co/handle/unal/78646 |
| Access Level: | acceso abierto |
| Palabra clave: | 620 - Ingeniería y operaciones afines Inhibicion de asfaltenos Nanoparticulas Daño de formación Punto Cedente Angulo de contacto Emulsiones Inhibition of Asphaltenes Nanoparticles formation damage Yield Point Contact angle Emulsions |
| Sumario: | During the production processes of a hydrocarbon field, the crude undergoes changes in pressure and temperature, especially in areas near the well where the washed area (area with alteration of petrophysical properties and / or presence of drilling fluids) generates a drop in additional pressure. Crudes with a colloidal stability index2 greater than 1.1 can generate aslphatene precipitation, with potential deposition effects that induce formation damage, affecting well productivity / injectability. The use of nanotechnology has been widely used in production stages for the prevention of formation damage, however, what effect would the use of nanoparticles have on a drilling fluid? Would it have a positive effect on preventing damage from drilling? The purpose of this work was to investigate the effect of the use of silica nanoparticles in a solids-free water-based drilling fluid, in the prevention of formation damage by aslphatene precipitation in the area near the well. For this, the filtering of the mud is used as the fluid for transporting the silica nanoparticles to the porous medium. During the development of this research work, laboratory tests were carried out such as: Characterization by API standards of the sludge system used in the research including the determination of rheological properties and filtration properties and to be able to determine if the use of silica nanoparticles generate changes negatives in drilling fluid; for the characterization of the filtrate as a carry fluid, for which tests were carried out with dynamic light scattering techniques (DLS), FTIR analysis, thermogravimetric analysis and XRD. Fluid-Fluid interactions were validated by fluid compatibility tests in three different relationships, according to the protocol described in the API RP 42 standard.In addition, interaction tests were performed between the filtrate (with and without nanoparticles) and asphaltenes in a qualitative way. And quantitative, using four mixtures in which the oily phase was kept constant with a known aslphatene concentration and varying the aqueous phase, thus: deionized water, water-nanoparticles, filtrate and filtrate-nanoparticles. This interaction was quantitatively evaluated using the UV-Vis spectrophotometry technique to determine the adsorbed concentration of aslphatenes in each case; qualifying the interfaces formed using microscopy; and following the change and the stabilization time of the fluids in the phases of each test. The Fluid-Rock interaction includes the recording of the changes in the wettability of the rock and measurement of the reduction in permeability after the precipitation of aslphatenes, for the first case, contact angle measurements were made in two porous media through the which are filtered with and without nanoparticlebased treatment. Displacement tests were carried out in porous media with similar petrophysical properties, displacing filtrate from the sludge system with and without silica nanoparticles, making measurements of relative permeability curves from which changes in the wettability of the porous medium were inferred and validated by changes in relative permeability curves changes in wettability. The methodologies used are based on experimental work developed by the group of surface phenomena of the National University of Colombia and on experiences in the manufacture and validation of water-based drilling fluids. The work yielded important results of the use of nanoparticles in sludge systems, not only in the prevention of formation damage, as polymer enhancers and filter controllers at high pressure and temperature conditions. The use of silica nanoparticles allows the reduction of formation damage by aslphatenes precipitation, however, in order to validate the results and extend the applicability to different types of crude oil; it is recommended to replicate this project in other areas with crude oils with indices of colloidal stability greater than 1.1. |
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