Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-18T20:55:14Z No. of bitstreams: 1 WendellRossineMedeirosDeSouza_TESE.pdf: 7150800 bytes, checksum: 939215abfa16589e581080cb1d3e85f5 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-24T23:17:21Z (GMT) No. of bitstreams: 1 WendellRossineMedeirosDeSouza_TESE.pdf: 7150800 bytes, checksum: 939215abfa16589e581080cb1d3e85f5 (MD5) / Made available in DSpace on 2017-10-24T23:17:22Z (GMT). No. of bitstreams: 1 WendellRossineMedeirosDeSouza_TESE.pdf: 7150800 bytes, checksum: 939215abfa16589e581080cb1d3e85f5 (MD5) Previous issue date: 2017-05-30 / A exposi??o dos po?os de petr?leo a condi??es extremas os tem levado a in?meros problemas de integridade, mesmo quando projetados adequadamente. O uso de t?cnicas de recupera??o, tal como a inje??o c?clica de vapor, submete os materiais a varia??es de temperatura severas reduzindo a vida ?til do po?o; ainda, podendo levar ? falha do revestimento met?lico e da bainha de cimento. A perda da integridade da bainha de cimento pode acarretar no vazamento dos fluidos presentes na forma??o e, em alguns casos, ocasionando significantes preju?zos ambientais e econ?micos. No caso de po?os sujeitos ? inje??o c?clica de vapor, a resist?ncia, a flexibilidade e as propriedades t?rmicas t?m sido apontadas como chave do problema. Neste trabalho, as an?lises termomec?nicas foram realizadas utilizando o m?todo dos elementos finitos em modo transiente. O revestimento met?lico, a bainha de cimento e a forma??o foram modelados utilizando-se um modelo 2D axissim?trico com elementos quadril?teros de 8 n?s. Foi analisado o comportamento mec?nico de bainha de cimento, sendo tr?s formula??es de pastas estudadas: pasta de refer?ncia e mais duas aditivadas com l?tex em concentra??es de 125 e 250 ml/kg de cimento. A influ?ncia da espessura da bainha de cimento e a taxa de aquecimento foram observadas como tamb?m seis diferentes valores de coeficientes de expans?o t?rmica para pasta de cimento. Foram analisados gradientes de temperaturas distintos de 150 oC, 200 oC, 250 oC, 300 oC e 350 oC, t?picas temperaturas encontradas no processo de inje??o de vapor, bem como em meio a forma??es com v?rios n?veis de rigidez. O estudo evidenciou que um dos problemas da integridade da bainha de cimento devido a inje??o de vapor est? associado a fase de aquecimento do po?o e localizado na regi?o da bainha pr?ximo ? forma??o. Foi constatado que vincular o emprego da formula??o mais flex?vel e expansiva a uma aplica??o do gradiente de temperatura de modo mais lento, pode prevenir o surgimento de danos na bainha de cimento evitando manobras de recimenta??o. Tal procedimento se mostrou eficaz para meios rochosos mais r?gidos bem como para temperaturas alvo mais elevadas. / Exposure of oil wells to extreme conditions has led to numerous integrity issues, even when designed properly. The use of recovery techniques, such as the cyclic steam injection, submits the materials to severe temperature variations, reducing the oil well lifespan; and may lead to failure of the steel casing and cement sheath. The loss of integrity of the cement sheath may lead to leakage of the fluids present in the formation and, in some cases, causing significant environmental and economic damages. In the case of wells subjected to the cyclic steam injection, resistance, flexibility and thermal properties have been identified as the key to the problem. In the present work, thermomechanical analyzes were performed using the finite element method in transient mode. The steel casing, the cement sheath and the formation were modeled using an axisymmetric 2D model with 8-node quadrilateral elements. The mechanical behavior of the cement sheath was analyzed, being three formulations of pastes studied: reference paste and two other paste with latex additives in concentrations of 125 and 250 ml / kg of cement. The influence of the cement sheath thickness and the heating rate were observed as well as six different coefficient values of thermal expansion for cement paste. It was analyzed the temperature gradients of 150 oC, 200 oC, 250 oC, 300 oC and 350 oC, typical temperatures encountered during the steam injection process, as well as between formations with various levels of rigidity. The study revealed that one of the problems of cement sheath integrity due to steam injection is associated with the heating phase of the well and located in the region of the sheath near the formation. It has been found that linking the use of the more flexible and expansive formulation to an extending temperature gradient period application may prevent damage to the cement sheath by avoiding recementing maneuvers. Such a procedure proved to be effective for more rigid rock media as well as for higher target temperatures.

Made available in DSpace on 2014-12-17T14:07:00Z (GMT). No. of bitstreams: 1 MariaDMP_pre_textuais_ate_cap_3.pdf: 1552357 bytes, checksum: 286c69a88a6d2c4ec8689ee9514da8ec (MD5) Previous issue date: 2008-10-28 / Oil wells subjected to cyclic steam injection present important challenges for the development of well cementing systems, mainly due to tensile stresses caused by thermal gradients during its useful life. Cement sheath failures in wells using conventional high compressive strength systems lead to the use of cement systems that are more flexible and/or ductile, with emphasis on Portland cement systems with latex addition. Recent research efforts have presented geopolymeric systems as alternatives. These cementing systems are based on alkaline activation of amorphous aluminosilicates such as metakaolin or fly ash and display advantageous properties such as high compressive strength, fast setting and thermal stability. Basic geopolymeric formulations can be found in the literature, which meet basic oil industry specifications such as rheology, compressive strength and thickening time. In this work, new geopolymeric formulations were developed, based on metakaolin, potassium silicate, potassium hydroxide, silica fume and mineral fiber, using the state of the art in chemical composition, mixture modeling and additivation to optimize the most relevant properties for oil well cementing. Starting from molar ratios considered ideal in the literature (SiO2/Al2O3 = 3.8 e K2O/Al2O3 = 1.0), a study of dry mixtures was performed,based on the compressive packing model, resulting in an optimal volume of 6% for the added solid material. This material (silica fume and mineral fiber) works both as an additional silica source (in the case of silica fume) and as mechanical reinforcement, especially in the case of mineral fiber, which incremented the tensile strength. The first triaxial mechanical study of this class of materials was performed. For comparison, a mechanical study of conventional latex-based cementing systems was also carried out. Regardless of differences in the failure mode (brittle for geopolymers, ductile for latex-based systems), the superior uniaxial compressive strength (37 MPa for the geopolymeric slurry P5 versus 18 MPa for the conventional slurry P2), similar triaxial behavior (friction angle 21? for P5 and P2) and lower stifness (in the elastic region 5.1 GPa for P5 versus 6.8 GPa for P2) of the geopolymeric systems allowed them to withstand a similar amount of mechanical energy (155 kJ/m3 for P5 versus 208 kJ/m3 for P2), noting that geopolymers work in the elastic regime, without the microcracking present in the case of latex-based systems. Therefore, the geopolymers studied on this work must be designed for application in the elastic region to avoid brittle failure. Finally, the tensile strength of geopolymers is originally poor (1.3 MPa for the geopolymeric slurry P3) due to its brittle structure. However, after additivation with mineral fiber, the tensile strength became equivalent to that of latex-based systems (2.3 MPa for P5 and 2.1 MPa for P2). The technical viability of conventional and proposed formulations was evaluated for the whole well life, including stresses due to cyclic steam injection. This analysis was performed using finite element-based simulation software. It was verified that conventional slurries are viable up to 204?F (400?C) and geopolymeric slurries are viable above 500?F (260?C) / Po?os sujeitos ? inje??o c?clica de vapor apresentam importantes desafios para desenvolvimento de pastas de cimenta??o, devido principalmente aos esfor?os de tra??o causados pelos gradientes t?rmicos durante a sua vida ?til. Falhas em cimenta??es que empregaram pastas convencionais de elevada resist?ncia ? compress?o levaram ao emprego de pastas mais flex?veis e/ou d?cteis, com destaque para as pastas de cimento Portland com adi??o de l?tex. Recentes pesquisas t?m apresentado pastas geopolim?ricas como alternativa. Estas pastas cimentantes s?o baseadas na ativa??o alcalina de aluminosilicatos amorfos como o metacaulim ou a cinza volante e possuem propriedades vantajosas como alta resist?ncia ? compress?o, r?pido endurecimento e estabilidade t?rmica. Encontram-se na literatura formula??es geopolim?ricas b?sicas que atendem ?s especifica??es da ind?stria de petr?leo, incluindo reologia, resist?ncia ? compress?o e tempo de espessamento. Neste trabalho, desenvolveu-se novas formula??es geopolim?ricas ? base de metacaulim, silicato de pot?ssio, hidr?xido de pot?ssio, micross?lica e fibra mineral, utilizando o estado da arte em composi??o qu?mica, modelagem de misturas e aditiva??o para otimizar as propriedades relevantes para a cimenta??o de po?os. Partindo de raz?es molares consideradas ideais na literatura (SiO2/Al2O3 = 3,8 e K2O/Al2O3 = 1,0), realizou-se um estudo de misturas secas baseado no modelo do empacotamento compress?vel, obtendo-se um volume ?timo de 6% para o material s?lido adicional. Este material (micross?lica e fibra mineral) serve tanto como fonte de s?lica adicional (no caso da micross?lica) quanto refor?o mec?nico, principalmente no caso da fibra mineral, a qual incrementou a resist?ncia ? tra??o. Realizou-se o primeiro estudo mec?nico triaxial desta classe de pastas. Para efeito de compara??o, tamb?m foi realizado um estudo mec?nico de pastas convencionais ? base de l?tex. Apesar de diferen?as no modo de ruptura (fr?gil no caso dos geopol?meros, d?ctil no caso das pastas com l?tex), a superior resist?ncia compressiva uniaxial (37 MPa para a pasta geopolim?rica P5 versus 18 MPa para a pasta convencional P2), comportamento triaxial similar (?ngulo de atrito 21? para P5 e P2) e menor rigidez (na regi?o el?stica 5,1 GPa para P5 versus 6,8 GPa para P2) das pastas geopolim?ricas permitiu uma capacidade de absor??o de energia (155 kJ/m3 para P5 versus 208 kJ/m3 para P2) compar?vel entre as duas, sendo que os geopol?meros atuam no regime el?stico, sem a microfissura??o presente nas pastas com l?tex. Assim, os geopol?meros estudados neste trabalho devem ser dimensionados para aplica??es no regime el?stico para evitar fraturas fr?geis. Finalmente, a resist?ncia ? tra??o do geopol?mero ? originalmente pobre (1,3 MPa para a pasta geopolim?rica P3) devido ? sua estrutura fr?gil. Entretanto, ap?s a aditiva??o desse sistema com fibra mineral, a resist?ncia ? tra??o do mesmo tornou-se equivalente (2,3 MPa para P5 e 2,1 MPa para P2) ? das pastas com l?tex. A viabilidade t?cnica das formula??es convencionais e geopolim?ricas foi avaliada durante toda a vida ?til do po?o, incluindo os esfor?os devidos ? inje??o c?clica de vapor. Esta an?lise foi feita utilizando um software de simula??o ? base de elementos finitos. Verificou-se que as pastas convencionais s?o vi?veis at? a temperatura de 204?C (400?F) e as geopolim?ricas acima de 260?C (500?F)

?rea de concentra??o: Qu?mica anal?tica. / Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2016-12-21T13:02:41Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) glauber_antonio_reis_andrade.pdf: 2400963 bytes, checksum: 99ec593844d6ba3a1107158d86656739 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-01-21T11:09:00Z (GMT) No. of bitstreams: 2 license_rdf: 9 bytes, checksum: 42dd12a06de379d3ffa39b67dc9c7aff (MD5) glauber_antonio_reis_andrade.pdf: 2400963 bytes, checksum: 99ec593844d6ba3a1107158d86656739 (MD5) / Made available in DSpace on 2017-01-21T11:09:00Z (GMT). No. of bitstreams: 2 license_rdf: 9 bytes, checksum: 42dd12a06de379d3ffa39b67dc9c7aff (MD5) glauber_antonio_reis_andrade.pdf: 2400963 bytes, checksum: 99ec593844d6ba3a1107158d86656739 (MD5) Previous issue date: 2016 / A Teofilina (TF), Clindamicina (CM), Varfarina (VF) e Verapamil (VP) s?o f?rmacos de baixo ?ndice terap?utico que necessitam de um controle de qualidade rigoroso na elabora??o de suas formula??es. O desenvolvimento de m?todos mais simples e r?pidos para doseamento desses medicamentos ? de grande interesse no setor farmac?utico. Neste sentido, o presente trabalho apresenta uma nova metodologia para determina??o desses f?rmacos por amperometria de m?ltiplos pulsos (MPA) acoplada ao sistema de an?lise por inje??o em batelada (BIA), utilizando o eletrodo de Diamante dopado com Boro (DDB). A an?lise em BIA foi realizada em uma c?lula eletroqu?mica do tipo Wall Jet, onde as inje??es foram realizadas por meio de uma micropipeta autom?tica ou, manualmente, por uma seringa descart?vel para TF, CM e VF, mostrando a possibilidade de diminuir custo do sistema de an?lise. O comportamento eletroqu?mico da TF, CM, VF e VP foi investigado por voltametria c?clica e os eletr?litos suportes escolhidos foram o ?cido sulf?rico 0,1 mol L-1, tamp?o fosfato 0,1 mol L-1 (pH 7,0), tamp?o fosfato 0,1 mol L-1 (pH 7,0) com 10% de ?lcool et?lico e ?cido sulf?rico 0,2 mol L-1, respectivamente. Nesses eletr?litos tr?s f?rmacos apresentaram um ?nico processo de oxida??o: a TF em +1,33V, a CM em +1,18 V e a VF em +0,90 V. J? o VP apresentou tr?s processos de oxida??o entre +1,2V e +1,5V, al?m de um processo de redu??o em +0,2V depende das oxida??es. A detec??o MPA-BIA foi baseada na aplica??o de um pulso de potencial de detec??o e outro de limpeza do DDB para tr?s f?rmacos. Neste caso, os pulsos de potencial para detec??o da TF, CM e VF foram todos aplicados por 100ms em +1,5V, +1,6V e +1,2V, respectivamente. Para determina??o do VP foram utilizados tr?s pulsos de potencial, um para oxida??o do VP (gerador) em +1,6V/50ms, um para redu??o do produto gerado (coletor) e quantifica??o do VP em -0,1V/30ms, e um terceiro em +1,1V/100ms para limpeza da superf?cie do DDB. A velocidade de inje??o da MA foi otimizada em 100?L s-1, exceto para VP que foi de 47?Ls-1, e com a SD a velocidade de inje??o foi de aproximadamente 107 ?Ls-1 pra a TF, CM e VF, proporcionando uma frequ?ncia anal?tica te?rica de pelo menos 53 determina??es por hora desses f?rmacos. Um baixo desvio padr?o relativo (10 medidas) foi obtido para todos os f?rmacos, n?o ultrapassando 3,0% tanto pela inje??o autom?tica quanto pela manual. As curvas anal?ticas foram estabelecidas e uma boa faixa linear foi obtida para todos os f?rmacos com pelo menos duas ordens de concentra??o. Os coeficientes de correla??o linear para todas as regress?es foram maiores que 0,992 em todos os estudos. Os estudos de adi??o e recupera??o mostraram valores pr?ximos a 100 % para todas as amostras farmac?uticas analisadas. O m?todo proposto usando a inje??o autom?tica e manual foi devidamente validado pelo m?todo oficial para cada um dos f?rmacos avaliados. Portanto, a detec??o MPA-BIA usando o eletrodo de DDB mostrou ser uma alternativa mais simples e r?pida para determina??o da TF, CM, VF e VP em formula??es farmac?uticas, possibilitando ainda uma diminui??o do custo do sistema BIA pela substitui??o da micropipeta autom?tica por uma seringa descart?vel. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016. / Theophylline (TF), Clindamycin (CM), Warfarin (VF) and Verapamil (VP) are drugs of narrow therapeutic index that require a strict quality control in the preparation of their formulations. Thus, the development of simple and rapid methods for determination of these drugs is very important in the pharmaceutical industry. In this sense, this paper presents a new methodology for determination of these drugs by multiple-pulse amperometry (MPA) coupled to batch injection analysis (BIA), using the boron-doped diamond (BDD) electrode. The analysis in BIA system was performed in an electrochemical cell (Wall Jet), where the injections were performed by automatic micropipette or manually by an disposable syringe for TF, CM and VF, showing a possibility to reduction of the analysis cost. The electrochemical behavior of the analytes was investigated by cyclic voltammetry and the support electrolytes were chosen for TF, CM, VF and VP in medium of sulfuric acid 0.1 mol L-1, phosphate buffer 0.1 mol L-1 (pH 7.0), phosphate buffer 0.1 mol L-1 (pH 7.0) with 10% ethyl alcohol and sulfuric acid 0.2 mol L-1, respectively. In these conditions, three drugs exhibited a single oxidation process: TF in +1.33V, the CM in +1.18V and the VF in +0.90V (vs Ag/AgCl). Already the VP presented three oxidation processes between +1.2V and +1.5V, besides a reduction process in +0.20 V that depends on the oxidation. The MPA-BIA detection for three drugs (TF, CM, VF) was based on the application of two potential pulses, one for detection and other for cleaning BDD electrode. In this case, the potential pulses to detection the TF, CM and VF were all applied for 100ms at +1.5V, +1.2V and +1.6 V, respectively. In determination of the VP, were used three potential pulses, one for oxidation of VP (generator potential pulse) in +1.6V/50ms, one for reducing the generated product (collector potential pulse) and performed quantification of VP in -0.1V/30ms, and a third potential pulse at +1.1V/100ms for cleaning BDD electrode. The injection speed using automatic micropipette was 100?L s-1, except for VP that was 47?Ls-1, and injection speed by insulin syringe was approximately 107?Ls-1, which provide theoretical analytical frequency of at least 53 determinations per hour of these drugs. A low standard relative deviation (10 measures) was obtained for all drugs, not extending beyond 3.0% by both injections systems. The analytical curves were established and a good linear range was obtained for all drugs with at least two orders of concentration. The linear correlation coefficients for all regressions were higher than 0.992. The addition and recovery studies show values close to 100% for all drug samples analyzed. The proposed method using automatic and manual injection was validated by official method for each analyte. Therefore, this paper presented a fast and simple method for the determination of TF, CM, VF and VP in pharmaceutical formulations using BIA-MPA detection with BBD electrode. Moreover, this work demonstrated an inexpensive method for application in routine analysis of narrow therapeutic index drugs, mainly using a manual injection in BIA system by an disposable syringe.

Made available in DSpace on 2014-12-17T14:08:54Z (GMT). No. of bitstreams: 1 HumbertoSC_DISSERT.pdf: 7792135 bytes, checksum: 5204c60825f60e9f74c5f24e46e8aa4e (MD5) Previous issue date: 2013-07-29 / Nearly 3 x 1011 m3 of medium and light oils will remain in reservoirs worldwide after conventional recovery methods have been exhausted and much of this volume would be recovered by Enhanced Oil Recovery (EOR) methods. The in-situ combustion (ISC) is an EOR method in which an oxygen-containing gas is injected into a reservoir where it reacts with the crude oil to create a high-temperature combustion front that is propagated through the reservoir. The High Pressure Air Injection (HPAI) method is a particular denomination of the air injection process applied in light oil reservoirs, for which the combustion reactions are dominant between 150 and 300?C and the generation of flue gas is the main factor to the oil displacement. A simulation model of a homogeneous reservoir was built to study, which was initially undergone to primary production, for 3 years, next by a waterflooding process for 21 more years. At this point, with the mature condition established into the reservoir, three variations of this model were selected, according to the recovery factors (RF) reached, for study the in-situ combustion (HPAI) technique. Next to this, a sensitivity analysis on the RF of characteristic operational parameters of the method was carried out: air injection rate per well, oxygen concentration into the injected gas, patterns of air injection and wells perforations configuration. This analysis, for 10 more years of production time, was performed with assistance of the central composite design. The reservoir behavior and the impacts of chemical reactions parameters and of reservoir particularities on the RF were also evaluated. An economic analysis and a study to maximize the RF of the process were also carried out. The simulation runs were performed in the simulator of thermal processes in reservoirs STARS (Steam, Thermal, and Advanced Processes Reservoir Simulator) from CMG (Computer Modelling Group). The results showed the incremental RF were small and the net present value (NPV) is affected by high initial investments to compress the air. It was noticed that the adoption of high oxygen concentration into the injected gas and of the five spot pattern tends to improve the RF, and the wells perforations configuration has more influence with the increase of the oil thickness. Simulated cases relating to the reservoir particularities showed that smaller residual oil saturations to gas lead to greater RF and the presence of heterogeneities results in important variations on the RF and on the production curves / Aproximadamente 3 x 1011 m3 de ?leos m?dios e leves restar?o nos reservat?rios ao redor do mundo ap?s a aplica??o dos m?todos convencionais de recupera??o e grande parte desse volume seria recuper?vel com o uso de m?todos especiais. A combust?o in-situ (CIS) ? um m?todo de recupera??o avan?ada de petr?leo no qual um g?s que cont?m oxig?nio ? injetado no reservat?rio onde reage com o ?leo cru para criar uma frente de combust?o de alta temperatura que se propaga pelo reservat?rio. O m?todo HPAI (High Pressure Air Injection) ? uma denomina??o particular do processo de inje??o de ar aplicado em reservat?rios de ?leos leves, onde as rea??es de combust?o s?o dominantes entre 150 e 300?C e a gera??o de flue gas ? o principal fator de deslocamento do ?leo. Um modelo de simula??o de fluxo de um reservat?rio homog?neo foi constru?do para o estudo, o qual foi inicialmente submetido ? produ??o prim?ria, por 3 anos, e em seguida, ao processo de inje??o de ?gua por mais 21 anos. Nesse ponto, com a condi??o madura estabelecida no reservat?rio, foram selecionadas tr?s varia??es desse modelo, de acordo com o fator de recupera??o (FR) obtido, para o estudo da t?cnica de combust?o in-situ (HPAI). Em seguida realizou-se uma an?lise de sensibilidade sobre o FR de par?metros operacionais pr?prios do m?todo: vaz?o de inje??o de ar por po?o, concentra??o de oxig?nio no g?s injetado, esquema de inje??o de ar e configura??o dos canhoneados dos po?os. Essa an?lise, para um per?odo adicional de at? 10 anos produ??o, foi efetuada com o aux?lio da t?cnica de planejamento composto central. O comportamento do reservat?rio e os impactos de par?metros envolvendo as rea??es qu?micas e de particularidades de reservat?rio sobre o FR tamb?m foram avaliados. Adicionalmente foram elaborados uma an?lise econ?mica e um estudo de maximiza??o do FR do processo. As simula??es foram realizadas com o simulador de processos t?rmicos em reservat?rios STARS (Steam, Thermal and Advanced Process Reservoir Simulation) da CMG (Computer Modelling Group). Os resultados mostraram que os FR incrementais foram baixos e que o valor presente l?quido (VPL) ? impactado negativamente pelos elevados investimentos iniciais para compress?o do ar. Observou-se que a ado??o de maiores concentra??es de oxig?nio no g?s injetado e do esquema de inje??o de ar tipo five spot tende a favorecer o FR, e que a configura??o dos canhoneados dos po?os apresenta influ?ncia crescente com o aumento da espessura porosa com ?leo do reservat?rio. Casos simulados referentes ?s particularidades de reservat?rio indicaram que menores satura??es residuais de ?leo ao g?s levam a FR maiores e que a exist?ncia de heterogeneidades resulta em varia??es consider?veis nos FR e nas curvas de produ??o

Made available in DSpace on 2014-12-17T14:56:21Z (GMT). No. of bitstreams: 1 RafaelBS.pdf: 1607732 bytes, checksum: d5ad875fd4dc09637b9932966f4df8c0 (MD5) Previous issue date: 2003-07-16 / The continuous gas lift method is the main artificial lifting method used in the oil industry for submarine wells, due to its robustness and the large range of flow rate that the well might operate. Nowadays, there is a huge amount of wells producing under this mechanism. This method of elevation has a slow dynamics due to the transients and a correlation between the injected gas rate and the of produced oil rate. Electronics controllers have been used to adjust many parameters of the oil wells and also to improve the efficiency of the gas lift injection system. This paper presents a intelligent control system applied to continuous gas injection in wells, based in production s rules, that has the target of keeping the wells producing during the maximum period of time, in its best operational condition, and doing automatically all necessary adjustments when occurs some disturbance in the system. The author also describes the application of the intelligent control system as a tool to control the flow pressure in the botton of the well (Pwf). In this case, the control system actuates in the surface control valve / O m?todo de eleva??o por g?s lift cont?nuo ? o principal m?todo de eleva??o artificial utilizado, principalmente, para produ??o em po?os submarinos devido a sua robustez e a larga faixa de vaz?o que o po?o pode produzir. H? um grande percentual de po?os produzindo sob este mecanismo no Brasil. Este tipo de m?todo de eleva??o apresenta algumas caracter?sticas pr?prias, sendo uma delas sua din?mica lenta devido aos transientes e outra ? a exist?ncia de uma correla??o entre a vaz?o de g?s injetado e a vaz?o de ?leo produzido. Controladores eletr?nicos t?m sido utilizados para realizar ajustes em alguns par?metros do po?o e melhorar a efici?ncia de inje??o de g?s lift. Este trabalho apresenta um sistema inteligente de controle autom?tico da inje??o de g?s, baseando-se em regras de produ??o, que busca manter os po?os equipados para g?s lift cont?nuo produzindo o maior tempo poss?vel, nas condi??es ?timas de opera??o e que faz os ajustes autom?ticos necess?rios quando ocorre alguma perturba??o no sistema. Mostra-se que ? poss?vel, utilizando o sistema inteligente apresentado, exercer o controle da press?o de fluxo no fundo do po?o (Pwf) atrav?s da manipula??o da abertura da v?lvula de controle de superf?cie