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Previous issue date: 2015-01-29 / Os fluidos de perfura??o aquosos s?o os sistemas mais utilizados no mundo para a perfura??o de po?os petrol?feros, tendo sido, nas ?ltimas d?cadas, desenvolvidas excelentes formula??es para perfura??o de se??es iniciais com baixa temperatura e baixa press?o. No entanto, as reservas de petr?leo nessas condi??es est?o cada vez mais escassas, surgindo a necessidade operacional de atua??o em condi??es mais severas, ou seja, vem sendo relatada na literatura a necessidade de sistemas aquosos para atua??o em altas temperaturas e altas press?es (ATAP). As altas temperaturas dos po?os de petr?leo favorecem a degrada??o qu?mica dos pol?meros (aditivo comumente presente nas formula??es relatadas, atualmente, na literatura e aplicados em situa??es operacionais), podendo promover a redu??o da massa molar e perdas de viscosidade do sistema. Os microg?is podem ser aplicados em v?rios seguimentos da ind?stria, com destaque na ?rea do petr?leo, situa??o que s?o aplicados na estimula??o de po?os e na recupera??o avan?ada de petr?leo (EOR). Neste trabalho, a aplicabilidade de microg?is de hidroxipropilguar (HPG), obtidos por reticula??o do HPG com ?ons borato, foi avaliada quanto ? resist?ncia t?rmica em fluidos de perfura??o aquosos. A aplica??o de microg?is de HPG no fluido de perfura??o base ?gua aumentou a viscosidade aparente e reduziu o volume de filtrado na temperatura ? 25?C. Entretanto, com o aumento da temperatura para 50 ?C ocorreu redu??o da viscosidade aparente de 85 mPa.s para 25,45 mPa.s. Esses resultados indicam que o emprego de microg?is em fluidos de perfura??o aquosos pode ser uma alternativa promissora, desde que o agente reticulante seja adequadamente selecionado, ou seja, n?o sofra desativa??o com o aumento da temperatura e n?o seja influenciado pela salinidade do meio. / Aqueous drilling fluids are a widely used systemin the world to drill oil wells. This drilling system has been being developed excellent formulations for drilling initial sections with low temperature and low pressure in recent decades. However, the oil reserves in these conditions are increasingly scarce, ending up in the need for drilling fluids with better operational performance in the toughest conditions. Therefore, it has been reported in the literature the need for aqueous systems to operate at high temperatures and high pressures (HTHP). High temperatures of oil wells favor the chemical degradation of polymers (commonly reported in additive formulations currently in the literature and applied in operational situations), that can generate molecular weight reduction and viscosity losses. Microgels can be applied in vast industrie`s segments, highlighted in the oil field, as they are used in the estimulation of wells and in the Advanced Oil Recovery (EOR). In this work, the applicability of hydroxypropyl guar`s microgels (HPG), obtained by crosslinking the HPG with borate ions, was measured as the thermal stability in water based drilling fluids.The application HPG microgels in water-based drilling fluid has increased viscosity and the apparent volume of the filtrate reduced around 25 ? C. However, with the increase of temperature to 50 ?C, the viscosity of drilling fluids based on HPG microgels decreased from 85 mPa.s to 25,45 mPa.s. These results indicate that the use of microgels in aqueous drilling fluids is a promising alternative since the crosslinking agent has been properly selected, i.e., does not undergo deactivation with increasing temperature and is not affected by the salinity of the system.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22256 |
| Date | 29 January 2015 |
| Creators | Silva, Rafael Ara?jo da |
| Contributors | 65946499734, http://lattes.cnpq.br/7711521318854102, Bicudo, Tatiana de Campos, 25935096862, http://lattes.cnpq.br/2712586287719863, Cardoso, Oldemar Ribeiro, 00026704889, http://lattes.cnpq.br/5210460338989000, Fagundes, Fabio Pereira, 02534180460, http://lattes.cnpq.br/8770334212266182, Balaban, Ros?ngela de Carvalho |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM 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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