Comportamento reológico de materiais cimentícios para poços de petróleo contendo naftaleno condensado ou policarboxilato

Pastas a base de cimento Portland são utilizadas na cimentação de poços de petróleo. Elas consistem de uma mistura de partículas sólidas de cimento dispersas em água e aditivos. Atualmente, diversos materiais alternativos são utilizados como aditivos, objetivando a modificação e a melhoria das propriedades das pastas de cimento, especialmente no aumento da fluidez. Novos aditivos plastificantes são capazes de suportar as diversas condições de poços, promovendo propriedades no estado fluido compatíveis às condições exigidas para cimentação.Dispersantes são os componentes da pasta que garantem fluidez, além de proporcionar controle na água perdida por filtração na formação porosa, garantindo o sucesso da operação de bombeio. Em deter minados campos, além do efeito da profundidade, as condições geológicas das formações promovemvariações do gradiente de pressão e temperatura ao longo da profundidade vertical do poço. Recentemente, diversos aditivos químicos da indústria da construção civil tem sido estudados em condições de cimentação de poços de petróleo. Vários produtos testados tem apresentado desempenho superior aos produtos normalmente empregados pela indústria de petróleo com boa relação custo/benefício em função do volume de mercado da construção civil. Resultados promissores na seleção de aditivos com função dispersante da construção civil para operações de cimentação de poços de petróleo onshore foram obtidos para temperaturas até 80°C. O potencial de uso desses aditivos permite estabelecer novas soluções para problemas encontrados na cimentação de poços de petróleo HPHT, poços sujeitos à injeção de vapor, poços depletados e poços produtores de gás. Na construção civil, os superplastificantes permitem reduzir o fator água/cimento das argamassas proporcionando melhoria de propriedades como resistência mecânica e fluidez. Assim, o objetivo deste trabalho foi o estudo e a caracterização reológica de pastas constituídas de cimento Portland, água e aditivos do tipo plastificante, com função dispersante a base de naftaleno condensado e policarboxilato, na faixa de temperaturas de 58°C e 70ºC. As condições utilizadas para a avaliação dos aditivos alternativos foram baseadas em uma cimentação primária para um poço hipotético de 2200 m de profundidade e gradientes geotérmicos de 1,7°F/100 pés e 2,1°F/100 pés. Os resultados demonstraram a grande eficiência e o poder dispersivo do policarboxilato para as temperaturas estudadas. O aditivo promoveu alta fluidez, sem efeitos de sedimentação da pasta. O dispersante à base de naftaleno reduziutant o a viscosidade plástica como o limite de escoamento acimada concentração a partir de 0,13%. O modelo de Bingham descreveu bem o comportamento reológico das pastas com policarboxilato para todas as concentrações

Estudo comparativo de pás para aerogeradores de grande porte fabricadas em materiais compósitos reforçadas com fibra de carbono ou fibra de vidro

The research and development of wind turbine blades are essential to keep pace with worldwide growth in the renewable energy sector. Although currently blades are typically produced using glass fiber reinforced composite materials, the tendency for larger size blades, particularly for offshore applications, has increased the interest on carbon fiber reinforced composites because of the potential for increased stiffness and weight reduction. In this study a model of blade designed for large generators (5 MW) was studied on a small scale. A numerical simulation was performed to determine the aerodynamic loading using a Computational Fluid Dynamics (CFD) software. Two blades were then designed and manufactured using epoxy matrix composites: one reinforced with glass fibers and the other with carbon fibers. For the structural calculations, maximum stress failure criterion was adopted. The blades were manufactured by Vacuum Assisted Resin Transfer Molding (VARTM), typical for this type of component. A weight comparison of the two blades was performed and the weight of the carbon fiber blade was approximately 45% of the weight of the fiberglass reinforced blade. Static bending tests were carried out on the blades for various percentages of the design load and deflections measurements were compared with the values obtained from finite element simulations. A good agreement was observed between the measured and calculated deflections. In summary, the results of this study confirm that the low density combined with high mechanical properties of carbon fibers are particularly attractive for the production of large size wind turbine blades

Síntese enzimática de ésteres de açúcar: surfactantes e polímeros como novos materiais ambientalmente seguros

Sugar esters are substances which possess surfactant, antifungical and bactericidal actions and can be obtained through two renewable sources of raw materials: sugars and vegetable oils. Their excellent biodegradability, allied to lhe fact that they are non toxic, insipid, inodorous, biocompatible, no-ionic, digestible and because they can resist to adverse conditions of temperature, pH and salinity, explain lhe crescent use of these substances in several sections of lhe industry. The objective of this thesis was to synthesize and characterize surfactants and polymers containing sugar branched in their structures, through enzymatic transesterification of vinyl esters and sugars, using alkaline protease from Bacillus subtilis as catalyst, in organic medium (DMF).Three types of sugars were used: L-arabinose, D-glucose and sucrose and two types of vinyl esters: vinyl laurate and vinyl adipate. Aiming to reach high conversions from substrates to products for a possible future large scale industrial production, a serie of variables was optimized, through Design of Experiments (DOE), using Response Surface Methodology (RSM).The investigated variables were: (1) enzyme concentration; (2) molar reason of substrates; (3) water/solvent rale; (4) temperature and (5) time. We obtained six distinct sugar esters: 5-0-lauroyl L-arabinose, 6-0-lauroyl D-glucose, 1'-O-lauroyl sucrose, 5-0-vinyladipoyl L-arabinose, 6-0-vinyladipoyl D-glucose and 1 '-O-vinyladipoyl sucrose, being lhe last three polymerizable. The progress of lhe reaction was monitored by HPLC analysis, through lhe decrease of sugar concentration in comparison to lhe blank. Qualitative analysis by TLC confirmed lhe formation of lhe products. In lhe purification step, two methodologies were adopted: (1) chromatographic column and (2) extraction with hot acetone. The acylation position and lhe chemical structure were determined by 13C-RMN. The polymerization of lhe three vinyl sugar esters was possible, through chemical catalysis, using H2O2 and K2S2O8 as initiators, at 60°C, for 24 hours. IR spectra of lhe monomers and respective polymers were compared revealing lhe disappearance of lhe vinyl group in lhe polymer spectra. The molar weights of lhe polymers were determined by GPC and presented lhe following results: poly (5-0-vinyladipoyl L-arabinose): Mw = 7.2 X 104; PD = 2.48; poly (6-0-vinyladipoyl D-glucose): Mw = 2.7 X 103; PD = 1.75 and poly (1'-O-vinyladipoyl sucrose): Mw = 4.2 X 104; PD = 6.57. The six sugar esters were submitted to superficial tension tests for determination of the critical micelle concentrations (CMC), which varied from 122 to 167 ppm. Finally, a study of applicability of these sugar esters, as lubricants for completion fluids of petroleum wells was' accomplished through comparative analysis of lhe efficiency of these sugar esters, in relation to three commercial lubricants. The products synthesized in this thesis presented equivalent or superior action to lhe tested commercial products

Pirólise rápida catalítica do capim elefante utilizando materiais mesoporosos e óxidos metálicos para deoxigenação em bio-óleo

The fast pyrolysis of lignocellulosic biomass is a thermochemical conversion process for production energy which have been very atratactive due to energetic use of its products: gas (CO, CO2, H2, CH4, etc.), liquid (bio-oil) and charcoal. The bio-oil is the main product of fast pyrolysis, and its final composition and characteristics is intrinsically related to quality of biomass (ash disposal, moisture, content of cellulose, hemicellulose and lignin) and efficiency removal of oxygen compounds that cause undesirable features such as increased viscosity, instability, corrosiveness and low calorific value. The oxygenates are originated in the conventional process of biomass pyrolysis, where the use of solid catalysts allows minimization of these products by improving the bio-oil quality. The present study aims to evaluate the products of catalytic pyrolysis of elephant grass (Pennisetum purpureum Schum) using solid catalysts as tungsten oxides, supported or not in mesoporous materials like MCM-41, derived silica from rice husk ash, aimed to reduce oxygenates produced in pyrolysis. The biomasss treatment by washing with heated water (CEL) or washing with acid solution (CELix) and application of tungsten catalysts on vapors from the pyrolysis process was designed to improve the pyrolysis products quality. Conventional and catalytic pyrolysis of biomass was performed in a micro-pyrolyzer, Py-5200, coupled to GC/MS. The synthesized catalysts were characterized by X ray diffraction, infrared spectroscopy, X ray fluorescence, temperature programmed reduction and thermogravimetric analysis. Kinetic studies applying the Flynn and Wall model were performed in order to evaluate the apparent activation energy of holoceluloce thermal decomposition on samples elephant grass (CE, CEL and CELix). The results show the effectiveness of the treatment process, reducing the ash content, and were also observed decrease in the apparent activation energy of these samples. The catalytic pyrolysis process converted most of the oxygenate componds in aromatics such as benzene, toluene, ethylbenzene, etc

Degradacao termica e catalitica da borra oleosa de Petroleo com materiais nanoestruturados al-mcm-41 e AL-SBA-15

Aiming to reduce and reuse waste oil from oily sludge generated in large volumes by the oil industry, types of nanostructured materials Al-MCM-41 and Al-SBA-15, with ratios of Si / Al = 50, were synthesized , and calcined solids used as catalysts in the degradation of oily sludge thermocatalytic oil from oilfield Canto do Amaro, in the state of Rio Grande do Norte. Samples of nanostructured materials were characterized by thermogravimetric analysis (TG / DTG), X-ray diffraction (XRD), scanning electron microscopy (SEM), absorption spectroscopy in the infrared Fourier transform (FT-IR) and adsorption nitrogen (BET). The characterization showed that the synthesized materials resulted in a catalyst nanostructure, and ordered pore diameter and surface area according to existing literature. The oily sludge sample was characterized by determining the API gravity and sulfur content and SARA analysis (saturates, aromatics, resins and asphaltenes). The results showed a material equivalent to the average oil with API gravity of 26.1, a low sulfur content and considerable amount of resins and asphaltenes, presented above in the literature. The thermal and catalytic degradation of the oily sludge oil was performed from room temperature to 870 ° C in the ratios of heating of 5, 10 and 20 ° C min-1. The curves generated by TG / DTG showed a more accelerated degradation of oily sludge when it introduced the nanostructured materials. These results were confirmed by activation energy calculated by the method of Flynn-Wall, in the presence of catalysts reduced energy, in particular in the range of cracking, showing the process efficiency, mainly for extraction of lightweight materials of composition of oily sludge, such as diesel and gasoline

Efetividade do flúor e da escovação e eficácia dos materiais de colagem ionômero de vidro e resina composta na reversão das microporosidades criadas pelo condicionamento ácido no esmalte dentário

The objectives of this clinical study was to evaluate the use of the toothpaste with fluoride and without fluoride and the daily tooth brushing are effective in the reversion of the dental enamel conditioned by acid. Another objective of this clinical study was to evaluate if the positioning of orthodontic accessories with glass ionomer cement helps in the reversion of the dental enamel conditioned by acid, when compared to composed resin. One hundred and twenty teeth were selected with indication of extraction by orthodontic reasons. The 30 volunteers were divided, randomly, in two groups. A group used toothpaste without fluoride and the other with it. The teeth of the sample were shuffled, in each volunteer. The teeth were conditioned by the 37% orthophosphoric acid. One of the conditioned teeth stayed in the mouth and suffered action of the abrasion for the tooth brushing, in another teeth a stainless steel mesh protection was positioned with glass ionomer cement, in another tooth the screen was glued with composed resin, in a fourth tooth (the control) was only conditioned after the extractions, 60 days later. All the teeth were appraised through DIAGNOdent, MEVA and EDS. In the obtained data it was possible to observe that there were not statistic significant differences in any comparison, even in the group that did not have access to the fluoride in the toothpaste as in the other that had. According with the used methodology, it was possible to observe too that there was not statistic significant differences in any comparison, even in the group that had the stainless steel mesh positioned with glass ionomer cement as in the group that the stainless steel mesh was positioned with composed resin. However, it was observed that there was an improvement in the topography of the enamel in all the teeth. The accomplishment of this study was facilitated due to the participation of the researchers' of the health area (dentistry), materials engineer, physics and chemistry. The researchers were originating from the Federal University of Rio Grande do Norte and of the University of Queensland, in Australia. This interdisciplinary group was decisive in the accomplishment of the study. It can be concluded that the enamel tends to return to its initial aspect, even if the patient does not have access to fluoride. That is probably due the action of the abrasion for the tooth brushing and mastication. In spite of it not being significant, it is suggested that the conditioned enamel was more resistant to the abrasion in the group that had access to fluoride. It was also possible to conclude that the fluoride liberated by the glass ionomer was not enough to provide a significant difference in the enamel conditioned by the acid, when compared with the composed resin, even in the group that did not use fluoride in the toothpaste as in the group that used

Nas marés da vida: histórias e Saberes das mulheres marisqueiras

The harsh reality of women in the municipality of Indiaroba enlarges to much more from everyday household . Every day, they need courage and determination to adentrarem in mangrove cross functional seafood, which sold, ensure their survival. The life of catadoras seafood, fishing in mangrove and have your family's work, is the object of this study, through which search will be highlighted the history of women who perform a subsistence activity in your daily life. Will reflect on their work in the environment into which are entered, the vision that have labour, environment, family, sexuality, and their social relations. The research p Espírito Santo, in which these women, forgetting seafood calls, play activities diversified in its role of being a woman, reason personal awareness, generating an academic curiosity to know their life stories. Through ethnographic method, which spans observations, interviews, workshops and testimonials, we have tried to learn more about the daily life of forgetting seafood. This gives visibility to the human condition in one of its expressions which can help you understand and appreciate the cultural diversity of knowledge and knowledge constructed this activity pecheurfalco

Limites formais e materiais ao controle de constitucionalidade pelo Supremo Tribunal Federal

This document approaches the formal and material limits of the constitucionalidade control for the Supreme Federal Court, iniating with the study of the Constitution, detaching its evolution, nature and meanings, passing for its historical evolution, offering still a unconstitutionality concept. Is work the principles as material Constitution, making the distinction entere principles and rules, detaching the characteristics of the principles constitutional, and the basic principle of the Constituition. It analyzes metodologics the historical parameters and of the brazilian system of constitutionality control and detaches the paper of the Supreme Federal Court as positive legislator. It observes the beddings of the constitutionality control and the legitimacy of the Supreme Federal Court. Is examines the performance of the Supreme Federal Court in face of the principle of the legal security. Is offers a vision on the experience of the control of constitutionality in other constries. It still approaches the control of constitutionality in Brazil, detaching the critical points of its formal and material limits. Is verifies the application of the principles constitutional for the Supreme Federal Court in the diffuse control and the intent control of constitutionality, as well as the performance of the Supreme Federal Court ahead of the unconstitutional omissions. It brings to the debate the new perspectives how much to the formal and material limits of the control of constitutionality for the Supreme Federal Court. Objective to elaborate considerations concerning the limits of the constitutional jurisdiction from the model of Constituition, the character politican of the difficulties with respect to the definition of its formal and material limits from the performance of the Supreme Federal Court

Literatura e educação :ação argumentativa na discussão de histórias

The focus of this thesis is the discussion of stories from the fairy tales genre in reading classes of Children´s Literature. Its main purpose is to investigate the argumentative action in the mediation pedagogic process.The evidence from this study is that the argumentative action is a fundamental component of teacher´s mediation as far as story discussion is concerned. The concept of mediation in this thesis comes from principles of interacionist Psychology articulated with THE theory of argumentation. It is understood that argumentative action is a process that objectives to obtain and to intensify the interlocuter´s adhesion through speech. The analysis of the story discussion activity is based on Psycholinguistic, particularly on the study of prevision ability; on the Theory of reception with special reference to the theory of the aesthetic effect, which considers the reader´s reactions and reader´s replies to the text; and on sociocognitive conflict study highlighting conflicts modalities brought up by the discussion of texts. The corpus analysed is composed by discussion episodes of stories from reading classes of Children´s Literature realized through participative observation.The subjects were children aged five-six years old from a public pre-school located in Natal-RN, Brazil. The study highlights mediation acts of argumentative nature such as direct question; illustrations from the book; rereading that were used by the teacher-researcher in story discussion. Among its conclusions it is revealed that argumentative action in stories discussion favors and intensifies the agreement of children´s to the activity. It increases the interaction between text and reader; it favours children´s organization and explicitation of their thoughts. The analysed material shows children´s exposing their ability to argue when having adequade scaffolding by an argumentative mediator the teacher

Histórias do corpo negado: uma reflexão educacional sobre gênero e violência feminina

This research has been implanted on thematic area education, politic and culture, based on line research and cultures practices aducatives histories approaches and literaries. on this situations, be involved around the kind of relations investigating about history cultural perspective, the thematic: woman, violence, body and education in women s daily victims of fisic, sexual and psychological violence. The research period happens end of 20th century beginning of 21th, specially between the 1999 until 2002. The survey shows influence of sexually device above body to reveal the root of violence in kinds of relations, be present in lifehistory of women aggressors the prisoners women and the women who permits aggressions the victims who accuse in the police station of woman. to preserv her privacy, i have been utilized in my register book pseudonym by flowers, to everyone. i have been defended my theory by familyrelations, be constitued in micro powerspaces and learn about sex, under the influence of violence in kinds of relations, creating negative bodywoman. shows bodyconceptions and sexuality by light thinking of the French philosopher Mr. Foucault Michel, in his opinion sexuality is a mechanisms by power, it is present on circular form at the society from all the institutions. I have been run over of Erich Fromm s lover theory. Those are fontain of newspapers, Police Protests, the prisoners women statement and the women who permits aggressions that them accuse aggressors of hers. I also utilize as fontain the Brazilian Penal Coole. At last I have decide about the flowers-women´s history, they have discourse who divulge the really importance of body as privileged by wisdom and truths, it was translated by own subjectivity, learned educations relacions, repetead in family breast and be responsible of the actions at signature in the presence of society. These relacions, were twice think and was problematic, their will be bring seeds of social transformations

Histórias de idosos: sementes para cultivarmos uam educação para uma velhice bem-sucedida

We understand that the successful old age is not confined only in the analysis of quantitative aspects concerning the economic situation of the subject that gets old, but this special way of aging is related to other values, such as dignity, happiness, self-esteem, willingness, autonomy, independence, social involvement with family and friends, among others. Thus, this study aimed to investigate the human aging process, considering the history of life of ten seniors who fit the profile of successful old age, seeking to identify elements that contribute to educational thinking in order to get a successful aging. In this perspective, we argue in this study, the idea that we need to learn to engage in experiences that more than providing satisfaction and well-being in the moment in which we conducted, serve as a potentiating to a successful old age. Thus, throughout this thesis we question: what are the present indicative in the histories of life of elderly people, considered successful, which may contribute to an education that people experiencing their age more satisfactorily. This is a qualitative study, that took as universe a methodological oral history, in which we used as a technique of research a semistructured interview as a part of their life history, with emphasis on consideration of the following categories: diary routine, with emphasis on social harmony in the family, at work and in friendship groups of leisure and physical activity, self-knowledge and the learning experiences throughout life. To get the objectives outlined, as well as lectured on the categories analyzed, we support our reflection on the theory of the course of life, which includes human aging as a historical and cultural contextual reality. Our research revealed, among other things, that successful aging is coupled to an active lifestyle, where the involvement in physical activities, recreational and social experiences throughout life is important for increasing self-esteem, autonomy and joy of living, conditions that enable successful old age. Our study also revealed that the educationfor successful old age is linked with the consumption along the life, educational activities which broaden the possibilities of social interaction between people, even among different generations, since the interaction is important to learn and accept our possibilities and limits.

Corporeidade e formação docente: cenário geográfico das histórias de vida

L étude vient de présenter la recherche qui a eu lieu pendent la formation des professeurs d l'Institut d'Enseignement Supérieur Président Kennedy à Natal-RN, dont les sujets son les professeurs de la septième période du Cours Normal Supérieur. L objet d´étude sont les pratiques formatives de ces professeurs en formation par des difficultés qui ils présentaient pour comprendre les relations entre les domaines de connaissance le l interface avec les expériences, et le processus de formation. L objectif a éte identifier dans l expériences ludopoèthiques, les lieus de construction de l autoterritorialité des professeus en tant qu en formation. Parmi les pressuposés théoriques qui ont soutenu le développement de la recherche comprennent: Enseignement Humain ; Corps-espace; Corporéité; Auto-formation et Transdisciplinarité. L'approche de la recherche qualitative adopte les principes de la rechercheaction- formation, dans une perspective etnophenomenologique. La discipline Memorial de Formação avec l'utilisation de jeu de sable,a été le laboratoire des expériences, l outil de la recherche qui a subventionné la construction des narratives autobiographiques. La perspective transdisciplinaire sur l'étude a rassemblé dans la dimension épistémologique les références théoriques de la Géographie, de la corporéité. et des histoires de vie dans la formation. L'Atelier Corps (Bio) Géographique a été développé par cinq rencontres: Paysage du Sensible, Lieu de Sentipensar, Territoires des Découvertes, Région des Savoirs et de l'Espace Géographique de la Ecoformação. Les expériences vécues dans l'Atelier par les participants de la recherche ont permis une sensible et attentive écoute sur leur propre histoire, en donnant la possibilité de la reconstruction de la mémoire, et en faisant réfléchir sur son l'auto-formation. La découverte des cartes et la construction d un nouveau paysage autoformatif par les memoires ludiques des différentes phases de la vie, a fait apparaître la propriété ludopoètique de l autoterriotalité, au même temps qui a enrégistré la construction ontologique dans sa corporéité

A história local e seu lugar na história: histórias ensinadas em Ceará-Mirim

This Researchis about history education and is directed toward the understanding of teacher practices in schools of the basic education in Ceará-Mirim, a city located in the state of Rio Grande do Norte. Its purpose is to understand the approaching forms of local history in 5ª to 8ª grade classrooms in the light of the recent innovations in the fields of the historiografy and education. The study was done with a view of investigating local history is being taught by teachers, as well as reflecting on the necessary conditions to the accomplishment of a teaching whose know how to make possible to break, on the one hand, with the limits of the narrow `local view`, and, on the other hand, with the globalized view, negating the local particularitities and especifications. Such questions had emerged as the understanding of what local history contents can constitute in a significant component in the production of school historical knowledge in 5ª to 8ª grade classrooms. History education is analyzed, considering the depositions of three teachers of Ceará-Mirim in reagard to its historiography conceptions and history as a school subject. This inquiry is of a qualitative nature and had as a main strategy of data construction from the interviews with the teachers. The analysis indicates the permanence of teacher practices who, even though presenting innovations, bring an implicit value hierarchy where the place or thematic places are not contemplated in the school contents or appear overwhelmed by general history and the Brazilian history, configuring itself as a hierarchical relation to problematic historical ones. Thus the necessity of having historical school knowledge, that considers the local especifications, without, however, ignoring the articulations with other spatial dimensions

Histórias de vidas de Usuários de psicofármacos: o desafio do cuidar para a enfermagem

Study of qualitative approach using the oral history methodology, in modality oral history of life, which aimed to: tell the stories of lives of users of psychotropic drugs for prolonged period of time, in Family Health Unit Santarém (FHU Santarém), Natal-RN-Brazil; identify possible causes which influence and trigger, respectively, use of psychotropic for prolonged period of time; search for greater knowledge about this problem of public health; contribute with the planning and development of nursing cares, to users of psychotropic drugs for prolonged period of time, as well as in Mental Health Care, integrally, in perspective of Family Health Strategy (FHS). It was used as a baseline survey, the coverage area of family health team, from FHU Santarém, which belongs to Health District North II, from Municipal Health Secretariat, in Natal-RN-BR. Eight employees who use psychotropic drugs for prolonged period of time were interviewed. They volunteered to narrate their life stories, which were analyzed by using the thematic modality, since the study is focused on the question of the use of psychotropic drugs for prolonged period of time. The thematic axis crisis, prejudice and care, defined by the categorization of common elements, found through successive and careful readings of narratives, were used to analyze these stories of lives. The study found that users of psychotropic drugs for prolonged period of time are affected by mental health crisis, feeling need to be heard, as well as the existence of social prejudice towards people with mental disorders, and non-completion of development of managed care, by the family health team, and particularly, the nursing care to people suffering from mental disorders and users of psychotropic drugs for prolonged period of time. It is proposed that, in the search of development and planning of nursing care to users of psychotropic drugs for prolonged period of time, and in mental health care, integrally, in FHS, the nurse can think and make a drawing about manners of performing nursing care to this clientele through the use of consultation of nursing, conducting home visits, collective construction of spaces for listening and socialization, which can be used as possible paths for the construction of such care

A constituição discursiva de identidades étnicorraciais de docentes negros/as: silenciamentos, batalhas travadas e histórias (re) significadas

In this research study, in which I discuss the discursive constitution of ethnic-racial identity of black male and female teachers, I understand that the process of identity formation of the subject covers both personal/family and social/professional areas. In it, I propose, in general terms, to analyze the discursive practices present in narratives of black male and female teachers when they look for their social insertion into different social contexts, identifying outbreaks of resistance that are present in their process of ethnicracial identities. The fundamental issue that permeates the survey investigates: how can black male and female teachers behave discursively in the construction of ethnicracial identities in multiple distinct contexts? The theoretical foundations that support this research work come from theoretical fields that complement each other; among them, French Discourse Analysis, Foucault s Theory and cultural studies. These, even with their singularities, are being interlaced by the conception that conceives language as social practice. Methodologically, I adopt an interpretative and qualitative paradigm to examine not only the linguistic repertoires that compose these teachers written narratives written but also the data that were generated by semi-structured interviews. The results show that the subjects, realizing contrary forces that interfere in their process of social inclusion, make use of acetic techniques to (re)signify the history of their lives