Estudo reol?gico de um fluido de perfura??o ? base n-parafina, utilizando argila modificada com tensoativo

• Main Author: Cunha Filho, Fernando Jos? Vieira da
• Other Authors: 59545844434
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2016
• Subjects: CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA; Fluidos de perfura??o; Fluido base ?leo; Tensoativos; Organofiliza??o; Estudo estat?stico; Reologia
• Online Access: http://repositorio.ufrn.br/handle/123456789/20414

Submitted by Automa??o e Estat?stica ([e-mail]) on 2016-05-07T00:04:50Z No. of bitstreams: 1 FernandoJoseVieiraDaCunhaFilho_DISSERT.pdf: 1842958 bytes, checksum: 2191a99f87d6cfed0a71cb2a9466d014 (MD5) === Approved for entry into archive by Arlan Eloi Leite Silva ([e-mail]) on 2016-05-09T20:31:23Z (GMT) No. of bitstreams: 1 FernandoJoseVieiraDaCunhaFilho_DISSERT.pdf: 1842958 bytes, checksum: 2191a99f87d6cfed0a71cb2a9466d014 (MD5) === Made available in DSpace on 2016-05-09T20:31:23Z (GMT). No. of bitstreams: 1 FernandoJoseVieiraDaCunhaFilho_DISSERT.pdf: 1842958 bytes, checksum: 2191a99f87d6cfed0a71cb2a9466d014 (MD5) Previous issue date: 2015-08-25 === A perfura??o de po?os de petr?leo, uma das etapas da explora??o de ?leo e g?s, ? feita ininterruptamente e hoje ? capaz de ser realizada em regi?es de grande complexidade como nas chamadas ?guas profundas. Para isto, ? de extrema import?ncia a utiliza??o do fluido de perfura??o. Dentre os fluidos de perfura??o existentes, os fluidos de perfura??o ? base de ?leo s?o utilizados em situa??es nas quais se requer maior resist?ncia a temperaturas elevadas, baixa taxa de corros?o, baixa solubilidade das forma??es de sal, tais como as encontradas nas perfura??es da camada pr?-sal. Este trabalho teve como objetivo estudar reologicamente, atra? do STATISTICA 10, um fluido de perfura??o, produzido, a partir de um sistema microemulsionado, utilizando uma argila (bentonita) organofilizada. O fluido estudado foi constitu?do de n-parafina como fase ?leo, ?gua salina (35g/L de NaCl), tensoativo nonilfenoletoxilado com quatro graus de etoxila??o e a baritina, como adensante, para dar peso ao fluido e chegar ao peso de 8,5 lb/gal, usualmente utilizado em perfura??es e padr?o neste trabalho. O procedimento experimental foi dividido em seis etapas: processo de organofiliza??o da bentonita, na qual foi realizada a modifica??o superficial da argila atrav?s do tensoativo cati?nico brometo de hexadeciltrimetilam?nio (CTAB) em tr?s diferentes concentra??es: 30% acima da concentra??o micelar cr?tica (c.m.c); 30% abaixo da concentra??o micelar cr?tica (c.m.c); na concentra??o micelar cr?tica (c.m.c); an?lise da tens?o superficial e da molhabilidade, para assegurar que a modifica??o superficial foi realizada com sucesso; constru??o dos diagramas de fase tern?rios para obten??o dos sistemas microemulsionados; preparo do fluido de perfura??o; planejamento fatorial, para estudo estat?stico atrav?s do software STATISTICA 10.0; e an?lise reol?gica, que foi realizada no equipamento re?metro Thermo Cientific - HAAKE MARS (Modular Advanced Rheometer System) em tr?s diferentes temperaturas: 25?C, 45?C e 65?C. As vari?veis de respostas obtidas ap?s ensaio reol?gico foram: viscosidade pl?stica, viscosidade aparente, limite de escoamento e tixotropia. === For drilling of oil wells, one of the stages of oil and gas is of utmost importance to use the drilling fluid. Among the existing drilling fluids, the oil-based drilling fluids are used in situations which require higher strength at elevated temperatures, low corrosion rate, low solubility of the salt formations, such as those found in the perforations of the pre Layer-salt. This work aimed to study rheological, attracts STATISTICA 10 a drilling fluid, produced from a microemulsion system, using a clay (bentonite) organophilizated. The fluid was studied consisting of n-paraffin as oil phase, brine (35g / L NaCl), surfactant nonilfenoletoxilado with four degrees of ethoxylation and barytes as density modifier to give weight to the fluid and reach the weight 8.5 lb / gal, usually used in drilling and standard in this work. The experimental procedure was divided into six steps: organophilization process of bentonite, which was carried out the surface of the clay modified by the cationic surfactant hexadecyltrim ethylammonium bromide (CTAB) at three different concentrations: 30% above the critical micelle concentration (cmc); 30% below the critical micelle concentration (CMC); the critical micelle concentration (c.m.c); Analysis of surface tension and wettability, to assess the success of surface modification; Construction of ternary phase diagrams in order to obtain the microemulsion systems; preparation of drilling fluid; factorial design, to statistical study using STATISTICA software 10.0; and rheological analysis at three different temperatures: 25 ?C, 45 ?C and 65 ?C. The variable responses obtained after rheological testing were: plastic viscosity, apparent viscosity, yield stress and thixotropy. It was noticed increased wettability by decreasing the contact angle, as larger amounts of quaternary ammonium cations were adsorbed onto the clay surface. In addition, statistical analyzes have provided model equations to represent the response variables as a function of control variables significant for medium and predictive studied intervals.