Academic literature on the topic 'Cement slurries'
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Journal articles on the topic "Cement slurries"
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Nalyvaiko, O. I., O. L. Melnikov, L. G. Nalyvaiko, R. V. Petrash, and V. N. Khivrenko. "APPLICATION OF HYDROPHOBIC CEMENT SLURRIES «RAN-M» OF «RAMSINKS-2M» GROUP TO AVOID FLUID KICK." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 2, no. 49 (January 28, 2018): 295–300. http://dx.doi.org/10.26906/znp.2017.49.857.
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Laboratory studies of cement slurry and cement stone is established that hydrophobic cement slurry «RAN-M» consists of NTPha additives for well cements PTC-1-100 and «Ramsinks-2M». In the laboratory confirmed the technical parameters of the newest hydrophobic cement slurries (mobility, density, separation, pumpability, etc.) according to the standard requirements in the respective devices. Done such works as: implementation of the selection of formulations of cement slurries with different rate of strength development for different temperature integrals.
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Kędzierski, Miłosz, and Marcin Rzepka. "Zaczyny cementowe z dodatkiem nanorurek węglowych do uszczelniania otworów wiertniczych o wysokiej temperaturze i ciśnieniu złożowym (150°C, 90 MPa)." Nafta-Gaz 77, no. 5 (May 2021): 323–31. http://dx.doi.org/10.18668/ng.2021.05.05.
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The article presents the results of the influence of carbon nanotubes on the mechanical parameters of cement stones under high temperature and pressure conditions (150°C, 90 MPa). The tests used multi-walled carbon nanotubes (MWCNTs) with an external diameter of 10–20 nm and a length of 10–30 μm. Cement slurries contained 0.1% of CNTs bwoc (by the weight of cement). Laboratory tests of cement slurries were carried out at the Oil and Gas Institute – National Research Institute. The tests were carried out under conditions of increased pressure and temperature at 150°C, 90 MPa. Cement slurries were prepared on the basis of class G drilling cement. Developing recipes were guided by the requirements to be met by cement slurry for the cementing of casing in the conditions of high temperature and reservoir pressures. The densities of tested slurries ranged from 1900 kg/m3 to 2250 kg/m3 (slurries with the addition of hematite). The cement slurries were tested for density, fluidity, rheological parameters, filtration and thickening time. Compressive strength tests and measuring adhesion were carried out after 2, 7, 14 and 28 days. Cement slurry recipes with very good technological parameters were developed and after curing (after 28 days of hydration) had very high values of compressive strength, reaching up to 45 MPa. Cements were characterized by high values of adhesion to pipes reaching up 7 MPa after 28 days. The research showed significant information about possible applications of carbon nanotubes to modify the cement slurry under conditions of high temperature and pressure. The conducted tests confirmed that the addition of even small amounts of CNTs improves the mechanical parameters of the cement stone compared to the base sample without such addition, and also reduces the thickening time of cement slurries and reduces filtration. It is investigated that CNTs addition increases the viscosity and yield point of cement slurry. As a result, slurries with the addition of MWCNTs will more effectively displace the mud from the borehole and significantly affect the quality of cementation.
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Kędzierski, Miłosz, Marcin Rzepka, and Marcin Kremieniewski. "Wpływ nanorurek węglowych (CNTs) na parametry mechaniczne kamieni cementowych w warunkach HPHT." Nafta-Gaz 77, no. 2 (February 2021): 106–17. http://dx.doi.org/10.18668/ng.2021.02.05.
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The article presents the results of testing the influence of carbon nanotubes on the mechanical parameters of cement stones under HPHT conditions. Multi-walled carbon nanotubes (MWCNTs) with an external diameter of 10–20 nm and a length of 10–30 μm were used for testing. 0.1% of carbon nanotubes was added to the cement slurry. Laboratory tests of cement slurries were carried out at Oil and Gas Institute – National Research Institute. The tests were carried out under conditions of increased pressure and temperature in the temperature range of 60–130°C and the pressure range of 25–80 MPa. CEM I 42.5R Portland cement and Class G drilling cement were used to make the slurries at temperature of 60oC. Cement slurries for temperatures from 80oC to 130oC were prepared on the basis of class G drilling cement. The recipes were developed on the basis of the requirements to be met by cement slurry for the cementing of casing under conditions of very high temperatures and reservoir pressures. The densities of tested slurries ranged from 1,840 kg/m3 (slurries at a temperature of 60°C) to 2.250 kg/m3 (slurries with the addition of hematite).Compressive strength tests and adhesion measurements were carried out after 2, 7, 14 and 28 days. Cement slurry recipes with very good technological parameters were developed, which after curing (after 28 days of hydration) showed very high values of compressive strength, reaching up to 44 MPa. Cements were characterized by high values of adhesion to pipes reaching up 8 MPa after 28 days and flexural strength of about 11 MPa. The test results show that the addition of carbon nanotubes has a positive effect on the mechanical strength of cement stones with their addition. The stones modified in this way are characterized by high compressive strength and high adhesion to steel pipes. Further research is needed to determine the influence of carbon nanotubes on the microstructure of hardened cement slurries. It is also necessary to conduct further research on the determination of the optimal amounts of these agents and the selection of the most compatible additives for cement slurries that work optimally in combination with nanoparticles.
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Skripkiūnas, Gintautas, and Mindaugas Daukšys. "DILATANCY OF CEMENT SLURRIES WITH CHEMICAL ADMIXTURES." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 10, no. 3 (September 30, 2004): 227–33. http://dx.doi.org/10.3846/13923730.2004.9636310.
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The results of experimental investigation of plasticising, air‐entraining and viscosity‐modifying admixtures with different chemical composition influence on rheological properties and dilatancy of cement slurries are presented in the article. Rheological properties of cement slurries were tested by a rotation viscometer with coaxial cylinder, at different gradients of velocity. Dilatancy of cement slurries was determined by the distortion of the rheological curve and index of dilatancy D was calculated according to proposed methods. The results of investigation show that the properties of liquid disperse medium of structural system influence slightly the dilatancy of cement slurries. Plasticising admixtures with a different chemical composition slightly increases but air-entraining and viscosity-modifying admixtures slightly reduces the dilatancy of cement slurries.
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Kut, Łukasz. "Opracowanie receptur zaczynów cementowych do uszczelniania otworów o podwyższonych temperaturach w rejonie Karpat." Nafta-Gaz 77, no. 3 (March 2021): 200–2017. http://dx.doi.org/10.18668/ng.2021.03.06.
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Works related to the drilling of a deep borehole must take into account the specific conditions at its bottom. This applies especially to high temperatures, exceeding 90–100°C, and pressures of 60–80 MPa. Such difficult downhole conditions have often posed many problems when developing appropriate compositions of cement slurries used for sealing columns of casing pipes. With each passing year, drilling companies make deeper and more complicated boreholes, more and more often exceeding 3000 m, which require the use of specially developed recipes of cement slurries when sealing the casing column. In deep boreholes (with very high temperature and pressure), a serious problem is to ensure a long pumping time of the cement slurry, which should be characterized by low viscosity, little or no free water and the lowest filtration possible. Therefore, it is necessary to select appropriate retardants that are resistant to high temperatures and additives ensuring the appropriate technological parameters of the slurries and cement stone. Pressure and temperature parameters increase with the depth of the borehole. Reservoir waters (brines of different mineralization) largely affect the hardened cement slurry, therefore cement slurries intended for deep boreholes should contain in their composition additives that increase thermal resistance, delay setting, lower filtration and improve resistance to chemical corrosion caused by the action of brines reservoir. The aim of the laboratory research was to develop innovative formulas of cement slurries for sealing boreholes, both crude oil and geothermal, with increased temperatures (up to about 130°C) located in the Carpathian region. During the implementation of the topic, laboratory tests were carried out on both cement slurries and cement stones obtained from them. Due to the industry’s interest in acquiring energy from sources other than crude oil and natural gas, a broader scope of laboratory tests covered cement slurries for sealing geothermal boreholes with controlled rheological parameters, which can be used at high reservoir temperatures to seal deep boreholes. The cement slurries were prepared with tap water with the addition of potassium chloride in the amount of 3, 6 and 10% bwow (in relation to the amount of water). The following agents were successively added to the mixing water: defoaming, adjusting the setting and thickening time, plasticizing and reducing filtration. Cement slurries were made with the addition of 10% latex and a latex stabilizer in the amount of 1% bwoc (both components in relation to the weight of dry cement). The other ingredients: microcement (nanocement), microsilica, hematite and cement were mixed together and then added to the mixing water. All cement slurries were prepared on the basis of drilling cement G. When all components blended, the cement slurry was mixed for 30 minutes followed by laboratory measurements such as: density, fluidity, readings from the Fann apparatus, water retention, filtration, thickening time. From among the developed cement slurries, those with the best rheological parameters were selected, then samples of cement stones were prepared from them. Cement slurries were cured for 48 hours in an environment of high temperature and pressure (downhole conditions). The obtained cement stones were tested for: compressive strength, bending strength, porosity, adhesion of cement stone to steel pipes.
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Rzepka, Marcin, and Miłosz Kędzierski. "The Use of Nanomaterials in Shaping the Properties of Cement Slurries Used in Drilling." Energies 13, no. 12 (June 16, 2020): 3121. http://dx.doi.org/10.3390/en13123121.
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For several decades, constant research has been performed in the world in order to obtain more durable, tighter, or less environmentally harmful binding materials which could be used to seal casing strings in boreholes. There is an increasing search for innovative solutions allowing the production of the highest possible class of binding cements. Since the beginning of the 21st century, one thing which has become synonymous with development is nanotechnology—a dynamically growing branch of science involving both the design, production, and testing of structures with the size of billionths of a metre. Among other things, a set cement stone is made of the grains of hydrated calcium silicates and calcium aluminates, between which there are pore spaces. Fine grains of nanoparticles can successfully settle inside these spaces, causing a decrease in the porosity and permeability of cement matrix. The paper presents the results of laboratory tests performed for formulas of cement slurries containing between 0.5% and 1% of nanosilica, between 1% and 3% of nanosized alumina and approximately 0.1% of carbon nanotubes. The resulting slurries had a density of approximately 1830–1920 kg/m3 and zero water settling. The thickening times of slurries were selected in accordance with the given geological and technical conditions. Early compressive strength amounting to 3.5 MPa (based on a test using an ultrasound cement analyser) was achieved by slurries after times between approximately 7 and 14 h. Upon setting of samples, cement stones produced from slurries featured a very low share of capillary pores. After 28 days of hydration, the compressive strength of the resulting cement stones took on very high values, reaching even up to 50 MPa. Photographs of cement stones containing nanomaterials (taken by means of scanning microscopy) are a confirmation of the exceptionally compact microstructure of the resulting samples.
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Pike, William J. "Reciprocating Cement Slurries After Placement." Journal of Petroleum Technology 49, no. 08 (August 1, 1997): 846–48. http://dx.doi.org/10.2118/0897-0846-jpt.
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Bybee, Karen. "Transition Time of Cement Slurries." Journal of Petroleum Technology 57, no. 08 (August 1, 2005): 45–70. http://dx.doi.org/10.2118/0805-0045-jpt.
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Tang, Zhengjie, Runzhou Huang, Changtong Mei, Xiuxuan Sun, Dingguo Zhou, Xiuqiang Zhang, and Qinglin Wu. "Influence of Cellulose Nanoparticles on Rheological Behavior of Oil Well Cement-Water Slurries." Materials 12, no. 2 (January 17, 2019): 291. http://dx.doi.org/10.3390/ma12020291.
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Performance of hardened oil well cement (OWC) is largely determined by the rheological properties of the cement slurries. This work was carried out to investigate the effect of water- to-cement ratio (WCR) and cellulose nanoparticles (CNPs), including cellulose nanofibers (CNFs) and cellulose nanocrystals (CNCs), on rheology performance of OWC-based slurries using a Couette rotational viscometer coupled with rheological models. The yield stress and viscosity of neat OWC slurries had a decreasing trend with the increase of WCRs. The suspension became increased unstable with the increase of WCRs. The properties of CNPs, including rheological behaviors, surface properties and morphology, determine the rheological performance of CNP-OWC slurries. In comparison with CNC-OWC slurries, the gel strength, yield stress and viscosity of CNF-OWC slurries were higher as CNFs were more likely to form an entangled network. The gel strength, yield stress and viscosity of CNP-OWC slurries increased with reduced CNF size through regrinding and the proportion of CNFs in the mixture of CNFs and CNCs, respectively.
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Tao, Chengcheng, Barbara G. Kutchko, Eilis Rosenbaum, and Mehrdad Massoudi. "A Review of Rheological Modeling of Cement Slurry in Oil Well Applications." Energies 13, no. 3 (January 24, 2020): 570. http://dx.doi.org/10.3390/en13030570.
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The rheological behavior of cement slurries is important in trying to prevent and eliminate gas-migration related problems in oil well applications. In this paper, we review the constitutive modeling of cement slurries/pastes. Cement slurries, in general, behave as complex non-linear fluids with the possibility of exhibiting viscoelasticity, thixotropy, yield stress, shear-thinning effects, etc. The shear viscosity and the yield stress are two of the most important rheological characteristics of cement; these have been studied extensively and a review of these studies is provided in this paper. We discuss the importance of changing the concentration of cement particles, water-to-cement ratio, additives/admixtures, shear rate, temperature and pressure, mixing methods, and the thixotropic behavior of cement on the stress tensor. In the concluding remarks, we propose a new constitutive model for cement slurry, considering the basic non-Newtonian nature of the different models.
Dissertations / Theses on the topic "Cement slurries"
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Haimoni, A. M. "Rheology of a specific oilwell cement." Thesis, University of Surrey, 1987. http://epubs.surrey.ac.uk/643/.
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A brief review is made of the rheology of suspensions in general and cement slurries in particular. The factors influencing the flow behaviour of these systems are discussed. It is pointed out that the rheological properties of cement slurries can not be determined by theory alone from the original constituents, and experimental tests combined with empirical formulae are needed. The co-axial cylinder viscometer was used to characterise the rheological behaviour of the cement slurry used in this investigation, the slurry being made highly thixotropic by the use of additives, It is shown that no single flow model, however complex, can correctly fully describe the flow behaviour of such materials. The cement slurry used in this research programme had a structure which changed continuously with time and, when pumped through a pipe, formed a high water content slip layer on the pipe surface. An accurate theoretical solution for this type of pipe flow is lacking in the literature. A new method to predict the pressure gradient of such suspensions flowing in pipes is proposed and the technique was tested using a small pumping line and also with data extracted from the literature. The shear vane test, commonly used to measure shear strength of soils, was developed to measure gel strength of the cement slurry used in this investigation. It is shown that the gel strength measured with this technique is of considerable benefit when assessing the real material behaviour.
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Thibodeaux, Kristin. "Alkali-silica reaction in oilwell cement slurries using hollow glass spheres." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19288.
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Kyritsis, Konstantinos. "Synthesis and characterization of high temperature cement-based hydroceramic materials." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3939.
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Cement-based materials are of importance in the construction of geothermal wells and high-temperature oil and gas wells. These materials fill the annulus between the well casing and the rock forming a protective layer, known as sealant, which is used primarily to secure and support the casing inside the well. In addition it prevents entry of unwanted fluids into the well and communication between formation fluids at different levels. These cement based sealants need to perform for many years at high temperatures and in severe chemical environments; conditions which can cause the material of the well-casing to degrade resulting in reduced strength and increased permeability. The aim of this study is to develop new materials which will have the potential properties (high strength and low permeability) for use as sealants in geothermal and deep, hot oil wells. In order to do this special cement slurries, based on the CaO−Al2O3−SiO2−H2O (CASH) hydroceramic system, have been synthesised over the temperature range 200 to 350 °C (i.e. the typical working temperature of these wells). The additives used in these cement slurries are silica flour and alumina. A detailed description of a suite of novel hydroceramic compositions over the temperature range 200 to 350 °C is given. X-ray diffraction has been used to determine the mineralogical composition and Rietveld refinement to quantify the known phases present at different temperatures. In addition the chemistry of some of the major phases present has been examined using electron probe microanalysis. Scanning electron microprobe and simulation software have been employed to study the crystal shape of these major minerals. The engineering properties of the hydroceramic materials are very important. A study of the compressive strength and permeability has been carried out over a range of temperature (200 to 350 °C). In addition permeability has been calculated using simulation software and the results compared with experimental values. Hydroceramic formulations with excellent strength and permeability measurements have been found. Some of these formulations have been tested for durability under simulated well conditions. These materials have been immersed into different brines for a certain period of time at temperatures between 200 to 300 °C. Some preliminary results regarding the changes in mineralogy in these samples are presented in this thesis. These experiments have been carried out at the Synchrotron Radiation Source (SRS) using tomographic energy-dispersive diffraction imaging (TEDII).
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Tavares, Andrea Macleybiane Gois. "Síntese e caracterização de pastas de cimento aditivadas com resinas epóxi análises cinéticas, termodinâmicas e calorimétricas." Universidade Federal de Sergipe, 2010. https://ri.ufs.br/handle/riufs/3498.
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Conselho Nacional de Desenvolvimento Científico e TecnológicoCement has been used in the world, presenting a wide versatility. However, due to its chemical nature, it is subject to several types of chemical damages, especially for agents of acidic nature. With the purpose of increase its life-time, new cement slurries have been modified with the addition of specific additives. The objective of this work is to modify cement slurries with epoxy resins, which promote higher resistance of those materials in relation to acid attacks. Three cement slurries were synthesized with epoxy resins (GY, PY-1 and PY-2) and a standard slurries, which was composed by cement and water (w/c = 0,5). The syntheses were performed according to the API recommendations. After 30 days of hydration, the samples were characterized by XDR, FTIR and thermal analysis (TG and DSC). The slurries characterization has suggested the presence of low amounts of portlandita (Ca(OH)2) in the slurry with the higher content of polymerized epoxy resin. The hydration processes of the cement slurries were studied by heat-conduction microcalorimetry. The energetic and enthalpic hydration data were all exothermic in nature. It was verified that the addition of the polymers delayed the processes of hydration of the slurries, decreasing the flow of heat released as a function of the amount of added resin. The cumulative heat release curves have shown the presence of multilinearity of the kinetic processes. The hydration microcalorimetric data were well fitted to the multistep Avrami kinetic model. A kinetic study of HCl interaction with the new slurries were performed by the batch methodology at 25, 35, 45 e 55°C. The Avrami kinetic model also appears to be the most efficient in describing the kinetic isotherms. It was observed that the kinetic constants of interaction of the acid with the slurries increased with the increase of temperature and decreased as a function of the amount of resin added in the slurries. The speed of reaction of the cement slurries with HCl was determined from the kinetic parameters obtained by the Avrami model. Speed reaction in the order of 10-3 mol.g.h-1 were found for the standard slurry and of the order of 10-5 mol.g.h-1 for the slurries with the epoxy resins. In general, the analysis of the kinetic parameters indicated that increasing the resin amount in the composition of the slurries reduced the reaction speed and increased the resistance of those slurries to the acid attack.
O cimento é um dos materiais mais utilizados no mundo, apresentando uma larga versatilidade. No entanto, devido à sua natureza química, está sujeito a vários tipos de desgastes, especialmente por agentes de natureza ácida. Com a finalidade de prolongar o tempo de vida útil desse material, buscam-se novas formulações de pastas de cimento através da adição de aditivos específicos. O objetivo deste trabalho é a modificação de pastas de cimento com resinas epóxi, as quais promovem maior resistência desses materiais frente aos ataques ácidos. Foram sintetizadas três pastas de cimento com resinas epóxi (GY, PY-1 e PY-2) e uma pasta padrão, composta de cimento e água. Para preparação utilizaram-se dois tipos de resinas epóxi, uma do tipo bisfenol-A e seu endurecedor de isoforonodiamina (GY) e outra, uma combinação do bisfenol-F e do bisfenol-A com endurecedor de poliamidoamina (PY-1 e PY-2). Após 30 dias de hidratação, as amostras foram caracterizadas por DRX, FTIR e por análise térmica (TG e DSC). A caracterização das pastas sugeriu a presença de baixas quantidades de portlandita (Ca(OH)2) nas composições com maior porcentagem de resina epóxi. Os processos de hidratação das pastas de cimento foram estudados por calorimetria isotérmica. Os dados energéticos de entalpia de hidratação foram todos de natureza exotérmica. Foi verificado que a adição do polímero retardou o processo de hidratação das pastas, reduzindo o fluxo de calor liberado em função da porcentagem de resina adicionada. As curvas de liberação do fluxo de calor mostraram a presença de vários processos cinéticos distintos. Os dados de hidratação foram bem ajustados ao modelo cinético de Avrami. O estudo cinético de interação de HCl com as pastas de cimento foi realizado pelo método de batelada nas temperaturas de 25, 35, 45 e 55°C. O modelo cinético de Avrami também foi o que mais se mostrou eficiente em descrever as isotérmicas cinéticas. Foram observados que as constantes cinéticas de interação do ácido com as pastas aumentaram com o aumento da temperatura, e diminuíram em função do aumento da quantidade de polímero adicionado nas pastas. A velocidade de reação das pastas de cimento com o HCl foi estimada a partir dos parâmetros cinéticos obtidos pelo modelo de Avrami. Foram verificados valores de velocidade de reação da ordem de 10-3 mol.g.h-1 para a pasta padrão e da ordem de 10-5 mol.g.h-1 para as pastas aditivadas. Em geral, a análise dos parâmetros cinéticos indicou que o aumento da porcentagem de resina na composição das pastas reduziu a velocidade de reação e, aumentou a resistência dessas pastas ao ataque ácido.
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Araujo, Filho Romero Gomes da Silva. "Desenvolvimento de sistemas de pastas leves para aplica??o em cimenta??o de po?os petrol?feros com baixo gradiente de fratura." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15825.
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All around the world, naturally occurring hydrocarbon deposits, consisting of oil and gas contained within rocks called reservoir rocks , generally sandstone or carbonate exists. These deposits are in varying conditions of pressure and depth from a few hundred to several thousand meters. In general, shallow reservoirs have greater tendency to fracture, since they have low fracture gradient, ie fractures are formed even with relatively low hydrostatic columns of fluid. These low fracture gradient areas are particularly common in onshore areas, like the Rio Grande do Norte basin. During a well drilling, one of the most favorable phases for the occurrence of fractures is during cementing, since the cement slurry used can have greater densities than the maximum allowed by the rock structure. Furthermore, in areas which are already naturally fractured, the use of regular cement slurries causes fluid loss into the formation, which may give rise to failures cementations and formation damages. Commercially, there are alternatives to the development of lightweight cement slurries, but these fail either because of their enormous cost, or because the cement properties were not good enough for most general applications, being restricted to each transaction for which the cement paste was made, or both reasons. In this work a statistical design was made to determine the influence of three variables, defined as the calcium chloride concentration, vermiculite concentration and nanosilica concentration in the various properties of the cement. The use of vermiculite, a low density ore present in large amounts in northeastern Brazil, as extensor for cementing slurries, enabled the production of stable cements, with high water/cement ratio, excellent rheological properties and low densities, which were set at 12.5 lb / gal, despite the fact that lower densities could be achieved. It is also seen that the calcium chloride is very useful as gelling and thickening agent, and their use in combination with nanosilica has a great effect on gel strength of the cement. Hydrothermal Stability studies showed that the pastes were stable in these conditions, and mechanical resistance tests showed values of the order of up to 10 MPa
Em todo o mundo, ocorrem naturalmente dep?sitos de hidrocarbonetos, constitu?dos de petr?leo e g?s natural, contidos dentro de rochas denominadas "rochas reservat?rio", em geral arenitos ou carbonatos. Esses dep?sitos existem em variadas condi??es de press?o e profundidade, desde poucas centenas at? milhares de metros. Em geral, reservat?rios mais "rasos" t?m a tend?ncia a fraturar mais facilmente, pois possuem baixo gradiente de fratura, ou seja, as fraturas s?o formadas mesmo com colunas hidrost?ticas de fluido relativamente baixas. Essas zonas de baixo gradiente de fratura s?o particularmente mais comuns em zonas onshore, como aqui no Rio Grande do Norte. Um dos momentos mais prop?cios para a ocorr?ncia de fraturas ? durante a cimenta??o do po?o, ao se utilizar uma pasta cimentante de densidade superior ao m?ximo permitido pela estrutura rochosa. Al?m disso, em zonas j? naturalmente fraturadas, o uso de cimentos comuns causa perda de fluido para a forma??o, o que pode dar causa a cimenta??es falhas. Comercialmente, existem alternativas para o desenvolvimento de sistemas de pastas de cimento leves, mas esses falham ou em raz?o de seu elevad?ssimo custo, ou em fun??o das propriedades da pasta obtida n?o serem suficientemente boas para aplica??es mais gen?ricas, ficando restritas a cada opera??o para qual a pasta de cimento foi feita. Nesse trabalho foi realizado um planejamento estat?stico para determinar a influ?ncia de tr?s vari?veis, definidas como a concentra??o de cloreto de c?lcio, concentra??o de vermiculita e concentra??o de nano s?lica, nas v?rias propriedades do cimento. O uso da vermiculita, um min?rio de baixa densidade presente em grandes quantidades no nordeste brasileiro, como extensor para pastas cimentantes, permitiu a produ??o de pastas est?veis, com alta raz?o ?gua/cimento, propriedades reol?gicas excelentes e baixas densidades, que foram fixadas em 12,5 lb/Gal. Viu-se tamb?m que o cloreto de c?lcio ? um poderoso viscosificante e gelificante, e seu uso combinado com a nano s?lica possui grande efeito nas for?as g?is do cimento. Estudos de estabilidade hidrot?rmica mostraram que as pastas foram est?veis nessas condi??es, e os ensaios de resist?ncia mec?nica mostraram valores da ordem de at? 10 MPa
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Fernandes, Maria Roseane de Pontes. "Pastas comp?sitas cimento/s?lica/pol?mero para cimenta??o de po?os de baixa profundidade sujeitas ? inje??o de vapor." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12923.
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Previous issue date: 2009-12-22Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
The production of heavy oil fields, typical in the Northeastern region, is commonly stimulated by steam injection. High bottom hole temperatures are responsible not only for the development of deleterious stresses of the cement sheath but also for cement strength retrogression. To overcome this unfavorable scenario, polymeric admixtures can be added to cement slurries to improve its fracture energy and silica flour to prevent strength retrogression. Therefore, the objective of the present study was to investigate the effect of the addition of different concentrations of polyurethane (5-25%) to cement slurries containing 40% BWOC silica flour. The resulting slurries were characterized using standard API (American Petroleum Institute) laboratory tests. In addition to them, the mechanical properties of the slurries, including elastic modulus and microhardness were also evaluated. The results revealed that density, free water and stability of the composite cement/silica/polyurethane slurries were within acceptable limits. The rheological behavior of the slurries, including plastic viscosity, yield strength and gel strength increased with the addition of 10% BWOC polyurethane. The presence of polyurethane reduced the fluid loss of the slurries as well as their elastic modulus. Composite slurries also depicted longer setting times due to the presence of the polymer. As expected, both the mechanical strength and microhardness of the slurries decreased with the addition of polyurethane. However, at high bottom hole temperatures, the strength of the slurries containing silica and polyurethane was far superior than that of plain cement slurries. In summary, the use of polyurethane combined with silica is an interesting solution to better adequate the mechanical behavior of cement slurries to heavy oil fields subjected to steam injection
Em campos que possuem ?leos pesados ? necess?rio um meio para estimular o ?leo a fluir pela forma??o, tais reservas s?o caracter?sticas da Regi?o Nordeste do Brasil e necessitam da inje??o de vapor para sua recupera??o. Temperatura elevada no fundo do po?o proporciona tens?es induzidas na bainha de cimento, al?m de favorecer a retrogress?o de resist?ncia do cimento, comprometendo a qualidade da cimenta??o. Sendo assim, adiciona-se em pastas cimentantes, o pol?mero, afim de se promover maior plasticidade e s?lica a para evitar o efeito da perda de resist?ncia mec?nica (retrogress?o). Diante disso, o presente trabalho teve como objetivo estudar o comportamento de pastas de cimento contendo poliuretana em diferentes concentra??es (5% a 25%) e 40% BWOC de s?lica flour. Foram realizados ensaios padronizados pelo API (American Petroleum Institute) e ensaios para obten??o do m?dulo de elasticidade e microdureza, al?m da caracteriza??o das pastas formuladas. Os resultados mostraram que as pastas comp?sitas cimento/s?lica/poliuretana apresentaram valores de peso espec?fico, ?gua livre e estabilidade dentro dos estabelecidos por norma. As propriedades reol?gicas foram modificadas, a viscosidade pl?stica, o limite de escoamento e os g?is aumentaram com a adi??o a partir de 10% BWOC de poliuretana. A poliuretana favoreceu melhor controle de filtrado e diminuiu o m?dulo de elasticidade das pastas. A mesma tamb?m promoveu retardamento da pega do cimento. As propriedades mec?nicas de resist?ncia e microdureza diminu?ram com a adi??o de s?lica e/ou s?lica/poliuretana, entretanto, em alta temperatura a resist?ncia mec?nica das pastas com s?lica e poliuretana tiveram um valor bem superior quando comparado com a pasta de cimento padr?o. A caracteriza??o das pastas mostrou que a adi??o de s?lica e pol?mero diminui o teor de c?lcio do cimento e que h? a forma??o do filme polim?rico. Pol?mero combinado com cimento e s?lica pode ser usado como aditivo para diminuir o m?dulo de elasticidade e, desta forma, fornecer maior plasticidade e resist?ncia ?s ciclagens t?rmicas ocasionadas pelo processo de inje??o de vapor
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Anjos, Marcos Alyssandro Soares dos. "Adi??o do res?duo de biomassa da cana-de-a??car em pastas para cimenta??o de po?os petrol?feros produtores de ?leos pesados." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12742.
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Previous issue date: 2009-04-02The Potiguar basin has large fields of viscous oil where the used method for recovering is based on vapor injection; this operation is carried out by injecting vapor in the oilwell directly, without the protection of a revetment through thermal insulation, what causes its dilation and, consequently, cracks in the cement placed on the annular, and lost of hydraulic insulation; this crack is occasioned by the phenomenon of retrogression of the compressive resistance due to the conversion of the hydrated calcium silicate in phases calcium-rich, caused by the high temperatures in the wells, subjected to thermal recuperation. This work has evaluated the application of composite pastes with addition of residue of biomass of ground sugar-cane bagasse as anti-retrogression mineral admixture for cementation of oil-wells subjected to thermal recuperation. The addition of the mineral residue was carried out considering a relative amount of 10, 20, 30, 40 and 59% in relation to cement mass, trying to improve the microstructure of the paste, still being developed a reference paste only with cement and a paste with addition of 40% of silica flour - renowned material in the oil industry as anti-retrogression additive. Pozzolanic activity of the ash was evaluated through XRD, TG/DTG, as the resistance to compression, and it was also determined the physical and mechanical behavior of the pastes when submitted to cure at low temperatures (22 and 38? C); besides it was evaluated the behavior of the pastes when submitted to two cycles of cure at high temperature (280?C) and pressure (7 MPa). It was verified that the ash of the sugar-cane biomass presents pozzolanic reaction and has great efficiency in decrease the permeability of the paste by filler effect, as well as that addition of ash in a relative amount of 10, 20 e 30% increases cured compressive resistance at low temperatures. It was also showed that the ash in a relative amount of 40% and 59% has very significant efficiency as anti-retrogression additive, since it prevents the decrease of compressive resistance and forms hydrated calcium silicate type xenotlita and tobermorita which have more resistance and stability in high temperatures
A bacia Potiguar tem grandes campos de ?leo viscoso, onde o m?todo de recupera??o utilizado ? a inje??o de vapor; essa opera??o ? realizada injetando-se vapor diretamente no po?o, sem a prote??o do revestimento atrav?s de isolamento t?rmico, o que provoca a dilata??o do mesmo, provocando assim falhas no cimento colocado no anular, e conseq?entemente, perda do isolamento hidr?ulico, esta falha tem origem no fen?meno de retrogress?o da resist?ncia ? compress?o devido a convers?o do silicato de c?lcio hidratado em fases ricas em c?lcio, provocada pelas elevadas temperaturas nos po?os, sujeitos ? recupera??o t?rmica. O presente trabalho avaliou a aplica??o de pastas comp?sitas com adi??o de res?duos de biomassa do baga?o da cana-de-a??car mo?das como aditivo mineral anti-retrogress?o para cimenta??o de po?os petrol?feros sujeitos a recupera??o t?rmica. A adi??o do res?duo mineral foi realizada teores de 10, 20, 30, 40 e 59% em rela??o a massa do cimento, visando melhorar a microestrutura da pasta, sendo ainda produzidas uma pasta de refer?ncia, apenas com cimento e uma pasta com adi??o de 40% de silica flour material consagrado na ind?stria de petr?leo como aditivo antiretrogress?o. Foram avaliados a atividade pozol?nica da cinza atrav?s de DRX, TG/DTG e resist?ncia ? compress?o, determinando-se tamb?m o comportamento f?sico e mec?nico das pastas submetidas a cura com baixas temperaturas (22 e 38?C), al?m da avalia??o do comportamento das pastas submetidas a dois ciclos de cura a alta temperatura (280?C) e press?o (7 MPa). Verificou-se que a cinza de biomassa da cana apresenta rea??o pozol?nica, tendo grande efici?ncia na diminui??o da permeabilidade da pasta por efeito filler, e que as adi??es de cinza em teores de 10, 20 e 30% aumentam a resist?ncia ? compress?o das pastas curadas a baixas temperaturas. Constatou-se ainda que a cinza em teores de 40% e 59% tem ?tima efici?ncia como aditivo antiretrogress?o, pois evitam a diminui??o da resist?ncia ? compress?o e formam silicato de c?lcio hidratado do tipo xenotlita e tobermorita que se apresentam mais resistentes e est?veis as altas temperaturas
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Costa, Bruno Leonardo de Sena. "influ?ncia da adi??o de diferentes sais em pastas de cimento portland para cimenta??o de po?os de petr?leo." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12771.
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Previous issue date: 2013-09-28One of the great challenges at present time related with the materials area concerns of products and processes for use in petroleum industry, more precisely related to the Pre-salt area. Progresses were reached in the last years allowing the drilling of the salt layer, with the time reduction for drilling and larger success at the end. For the oil wells companies the preponderant factor is the technology, however, in spite of the progress, a series of challenges is still susceptible to solutions and one of them refers to the slurries preparation for cementing in those areas. Inside of this context, this study had for objective to analyze the influence of the salts NaCl, KCl, CaSO4 and MgSO4 in strength and chemical structure of the hydrated products. As methodology, they were prepared and analyzed cement slurries with varied concentrations of these salts that are commonly found in the saline formations. The salts concentrations used in formulations of the slurries were of 5%, 15% and 30%. The slurries were formulated with specific weight of 15,8 lb / gal and the cement used was Class G. Strength tests were accomplished in samples cured by 24 hours and 28 days. Also were realized crystallographic characterization (XRD) and morphologic (SEM). In agreement with the presented results, it is observed that the largest resistance values are attributed to the slurries with concentration of 15%. There was reduction of the strength values of the slurries formulated with concentration of 30%. Through the characterization microstructural it was possible to note the salts influence in the main cement hydrated products
Um dos grandes desafios da atualidade relacionado com a ?rea de materiais diz respeito ? produ??o de produtos e processos para uso na ind?stria do petr?leo, mais precisamente relacionado ? ?rea do Pr?-sal. Avan?os foram alcan?ados nos ?ltimos anos permitindo a perfura??o da camada de sal, com a redu??o do tempo para perfura??o dos po?os e maior ?xito ao final da opera??o. Apesar dos avan?os, uma s?rie de desafios ainda ? pass?vel de solu??es e um deles refere-se ? prepara??o de pastas para a cimenta??o de po?os nessas zonas com camadas evapor?ticas. Dentro deste contexto, este estudo teve por objetivo analisar a influ?ncia dos sais NaCl, KCl, CaSO4 e MgSO4 no comportamento mec?nico e estrutura qu?mica dos produtos hidratados. Como metodologia, foram preparadas e analisadas pastas de cimento com concentra??es variadas destes sais que s?o comumente encontrados nas forma??es salinas do reservat?rio do Pr?-sal. As concentra??es dos sais empregadas nas formula??es das pastas foram de 5%, 15% e 30%. As pastas foram formuladas com peso espec?fico de 15,8 lb/gal e o cimento utilizado na prepara??o das pastas foi o do tipo Portland Classe G. Foram realizados ensaios de resist?ncia ? compress?o em corpos de prova curados por 24 horas e 28 dias. Tamb?m foram realizados ensaios de caracteriza??o cristalogr?fica (DRX) e morfol?gica (MEV). De acordo com os resultados apresentados, observa-se que os maiores valores de resist?ncia s?o atribu?dos ?s pastas com concentra??o de 15 % para todos os sais. Houve, tamb?m, redu??o dos valores de resist?ncia das pastas formuladas com concentra??o de 30 % para todos os sais. Atrav?s das an?lises de caracteriza??o micro estrutural foi poss?vel observar a influ?ncia dos sais nos principais produtos hidratados do cimento Portland
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Freitas, J?lio Cezar de Oliveira. "Desenvolvimento de sistemas de aditivos qu?micos para aplica??o em cimenta??es de po?os de petr?leo." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12920.
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Previous issue date: 2010-06-18The primary cementing is an important step in the oilwell drilling process, ensuring the mechanical stability of the well and the hydraulic isolation between casing and formation. For slurries to meet the requirements for application in a certain well, some care in the project should be taken into account to obtain a cement paste with the proper composition. In most cases, it is necessary to add chemicals to the cement to modify its properties, according to the operation conditions and thus obtain slurries that can move inside the jacket providing a good displacement to the interest area. New technologies of preparation and use of chemicals and modernization of technological standards in the construction industry have resulted in the development of new chemical additives for optimizing the properties of building materials. Products such as polycarboxylate superplasticizers provide improved fluidity and cohesion of the cement grains, in addition to improving the dispersion with respect to slurries without additives. This study aimed at adapting chemical additives used in civil construction to be used use in oilwell cement slurries systems, using Portland cement CPP-Special Class as the hydraulic binder. The chemical additives classified as defoamer, dispersant, fluid loss controller and retarder were characterized by infrared absorption spectroscopy, thermogravimetric analyses and technological tests set by the API (American Petroleum Institute). These additives showed satisfactory results for its application in cement slurries systems for oil wells. The silicone-based defoamer promoted the reduction of air bubbles incorporated during the stirring of the slurries. The dispersant significantly reduced the rheological parameters of the systems studied. The tests performed with the fluid loss controller and the retarder also resulted in suitable properties for application as chemical additives in cement slurries
A cimenta??o prim?ria ? uma etapa importante durante o processo de perfura??o de po?os petrol?feros, garantindo a estabilidade mec?nica do po?o e o isolamento hidr?ulico entre o tubo de revestimento e a forma??o. Para que a pasta de cimento atenda aos requisitos estabelecidos para sua aplica??o em um determinado po?o, alguns cuidados no seu projeto de execu??o devem ser levados em considera??o para a obten??o de uma pasta de cimento com composi??o adequada. Na grande maioria dos casos, ? necess?ria a adi??o de produtos qu?micos ao cimento para modificar suas propriedades, conforme as condi??es do po?o ou opera??o e, assim, obter pastas que possam se deslocar no interior do revestimento promovendo um bom deslocamento at? a zona de interesse. Novas tecnologias de prepara??o e uso de produtos qu?micos e a moderniza??o dos padr?es tecnol?gicos no setor da constru??o civil t?m resultado no desenvolvimento de novos aditivos qu?micos para a otimiza??o das propriedades dos materiais construtivos. Produtos como superplastificantes a base de policarboxilato proporcionam maior fluidez e coes?o dos gr?os de cimento, al?m de melhorar a dispers?o em rela??o ?s pastas sem aditivos. Este trabalho tem como objetivo adequar aditivos qu?micos utilizados na constru??o civil para aplica??o em sistemas de pastas de cimento de po?os petrol?feros, utilizando como aglomerante hidr?ulico o cimento Portland CPP-Classe Especial. Os aditivos qu?micos classificados como antiespumantes, dispersantes, controladores de filtrado e retardadores de pega foram caracterizados por espectroscopia de absor??o na regi?o do infravermelho, an?lise termogravim?trica e ensaios tecnol?gicos estabelecidos pelo API (American Petroleum Institute). Estes aditivos apresentaram resultados satisfat?rios para sua aplica??o em sistemas de pasta de cimento para po?os de petr?leo. O antiespumante, a base de silicone, promoveu redu??o do aprisionamento de ar durante o processo de agita??o das pastas. O aditivo dispersante reduziu consideravelmente os par?metros reol?gicos dos sistemas estudados. Os testes realizados com o controlador de filtrado e o retardador de pega tamb?m apresentaram propriedades adequadas para aplica??o como aditivos qu?micos em pastas para cimenta??o
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Oliveira, Filipe Silva de. "Desenvolvimento de pastas de cimento flex?veis para po?os de petr?leo submetidos ? inje??o de vapor utilizando l?tex do tipo SBR." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12720.
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Previous issue date: 2011-05-23Novel cementing materials formulations containing flexible polymeric admixtures have been studied aiming at improving the mechanical behavior of oil well cement slurries submitted to steam injection. However, research activities in this sector are still under development. The steam injected directly into the well causes casing dilation, which after a reduction in temperature, tends to return to its original dimensions, resulting in crack formation and hydraulic isolation loss of the well, which will result in shortening of well life. In this scenario, the objective of the present study was to evaluate the mechanical behavior of Portland-based slurries containing SBR latex, applied in oil well cementing of wells submitted to steam injection. Were formulated slurries with densities of 1.797 g/cm3 (15.0 lb/Gal) and 1.869 g/cm3 (15.6 lb/Gal), containing admixtures with a latex concentration of 0; 66.88; 133.76; 200.64 and 267.52 L/m3 (0, 0.5, 1.0, 1.5 and 2.0 gpc). Tests including rheology, fluid loss control, thickening time, API compressive strength and splitting tensile strength, beyond steam injection simulation. Microstrutural characteristics of the slurries were also performed (XRD, TG, FTIR and SEM). The results showed that increasing the polymer concentration increased in the rheological properties and fluid loss, and a decrease in the elasticity modulus of the cement slurries. The results obtained showed that the slurries can be applied in cementing operations of oil wells submitted to steam injection.
Novas formula??es de pastas de cimento, aditivadas com materiais polim?ricos com caracter?sticas flex?veis, t?m sido estudadas para aplica??o em po?os sujeitos a inje??o de vapor. Entretanto, pesquisas neste setor ainda s?o atividades em desenvolvimento. O vapor injetado diretamente no po?o provoca a dilata??o do revestimento, o que ap?s redu??o na temperatura, tende a voltar as suas dimens?es iniciais, provocando forma??o de trincas e conseq?ente perda do isolamento hidr?ulico do po?o, que resultar? no encurtamento do tempo de sua vida ?til. Dentro deste contexto, este trabalho tem como objetivo estudar o comportamento mec?nico de sistemas de pastas de cimento Portland, aditivadas com l?tex SBR, para cimenta??o de po?os de petr?leo sujeitos a inje??o de vapor. Foram formuladas pastas com densidades de 1,797 g/cm3 (15,0 lb/Gal) e 1,869 g/cm3 (15,6 lb/Gal), aditivadas com concentra??o de 0; 66,88; 133,76; 200,64 e 267,52 L/m3 (0, 0,5, 1,0, 1,5 e 2,0 gpc) de l?tex. Foram realizados ensaios de reologia, controle de filtrado, tempo de espessamento, resist?ncia ? compress?o API e tra??o por compress?o diametral, al?m de simula??es de inje??o de vapor. Tamb?m foram realizadas caracteriza??es microestruturais das pastas de cimento (DRX, TG, FTIR e MEV). Os resultados mostraram que com o aumento da concentra??o do pol?mero ocorreram mudan?as nas propriedades reol?gicas e no volume de filtrado, al?m de uma diminui??o do m?dulo de elasticidade das pastas de cimento. A partir dos resultados obtidos verificou-se que as pastas podem ser aplicadas em opera??es de cimenta??o de po?os de petr?leo sujeitos a inje??o de vapor.
Book chapters on the topic "Cement slurries"
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Guillot, D., and J. F. Baret. "Principles and Applications of Cement Slurries." In Suspensions: Fundamentals and Applications in the Petroleum Industry, 601–35. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/ba-1996-0251.ch012.
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Stoyanova, G., L. Stoilova, and Y. Ivanov. "Rheological properties of raw cement slurries." In Progress and Trends in Rheology II, 347–49. Heidelberg: Steinkopff, 1988. http://dx.doi.org/10.1007/978-3-642-49337-9_120.
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Rashidi, Masoud, Biltayib Misbah Biltayib, and Adel Asadi. "Experimental Analysis and Cement Slurries Properties Evaluation Using Novel Additives." In Advances in Petroleum Engineering and Petroleum Geochemistry, 121–24. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01578-7_29.
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"Viscoelastic properties of oilfield cement slurries." In Rheology of Fresh Cement and Concrete, 180–88. CRC Press, 1990. http://dx.doi.org/10.1201/9781482288889-26.
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Guillot, Dominique. "4 Rheology of Well Cement Slurries." In Developments in Petroleum Science, 4–1. Elsevier, 1990. http://dx.doi.org/10.1016/s0376-7361(09)70302-4.
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"High temperature and high pressure rheology of oilwell cement slurries." In Rheology of Fresh Cement and Concrete, 169–79. CRC Press, 1990. http://dx.doi.org/10.1201/9781482288889-25.
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Wang, Y., and C. Meyer. "Flow of fiber-reinforced cement slurries at elevated temperatures." In Computational Fluid and Solid Mechanics, 1017–18. Elsevier, 2001. http://dx.doi.org/10.1016/b978-008043944-0/50829-5.
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Oikonomou, N. "REPAIRING SLURRIES BASED ON A COMBINATION OF CEMENT-FLY ASH AND BITUMEN EMULSION." In Role of Cement Science in Sustainable Development, 413–18. Thomas Telford Publishing, 2003. http://dx.doi.org/10.1680/rocsisd.32460.0042.
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"Use of a controlled stress rheometer to study the yield stress of oilwell cement slurries." In Rheology of Fresh Cement and Concrete, 135–46. CRC Press, 1990. http://dx.doi.org/10.1201/9781482288889-22.
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"Laminar and turbulent flow of cement slurries in large diameter pipe - a comparison with laboratory viscometers." In Rheology of Fresh Cement and Concrete, 157–68. CRC Press, 1990. http://dx.doi.org/10.1201/9781482288889-24.
Full textConference papers on the topic "Cement slurries"
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Durmaz, Sukru, Hanieh Karbasforoushan, Evren M. Ozbayoglu, Stefan Z. Miska, Mengjiao Yu, and Nicholas Takach. "Mixing of Cement Slurries During Cement Plug Setting." In SPE Deepwater Drilling and Completions Conference. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/180338-ms.
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Skalle, P., K. R. Backe, S. K. Lyomov, O. B. Lile, H. Justnes, and J. Sveen. "Shrinkage of Oil Well Cement Slurries." In Annual Technical Meeting. Petroleum Society of Canada, 1997. http://dx.doi.org/10.2118/97-77.
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Clark, P. E., L. Sundaram, and M. Balakrishnan. "Yield Points in Oilfield Cement Slurries." In SPE Eastern Regional Meeting. Society of Petroleum Engineers, 1990. http://dx.doi.org/10.2118/21279-ms.
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Chan, Lakmun, Jorge Vasquez, and Carlos Flores Leon. "Liquid-Bead Solution for Lightweight Cement Slurries." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/196262-ms.
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Backe, K. R., O. B. Lile, and S. K. Lyomov. "Characterising Curing Cement Slurries by Electrical Conductivity." In SPE Western Regional Meeting. Society of Petroleum Engineers, 1998. http://dx.doi.org/10.2118/46216-ms.
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Zacarias, D. "Determination Of Design Temperature For Cement Slurries." In SPE Latin America Petroleum Engineering Conference. Society of Petroleum Engineers, 1992. http://dx.doi.org/10.2118/23714-ms.
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Fic, S., A. Szewczak, and Ł. Guz. "Microhardness of the slurries and cement mortars." In THE 3RD JOINT INTERNATIONAL CONFERENCE ON ENERGY ENGINEERING AND SMART MATERIALS (ICEESM-2018) AND INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY AND NANOMATERIALS IN ENERGY (ICNNE-2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5051102.
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Hansen, Will, Eduardus Koenders, and Zhichao Liu. "Rheology and Hydration of Cementitious Slurries." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24630.
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Predicting temperature effects on rheology and hydration of cementitious slurries considered for oil-well cement applications is important as temperature can vary significantly in a bore-well. During the plastic stage the fluid properties (yield and plastic viscosity) are investigated using a rheometer, while isothermal calorimetry is used to evaluate setting characteristics and early-age (0–7 days) heat of hydration. In this paper, experimental results at 3 different temperatures show that a 50/50 blend of Type I portland cement and slag cement at a 0.45 water-cementitious ratio has similar rheological and hydration properties as the reference system (Type I portland cement paste). The rheological properties were found to follow a two-parameter Bingham model, and temperature effects can be accounted for by an Arrhenius model. The effect of temperature on hydration rate can be predicted by a maturity function, which also is based on the Arrhenius rate model, where the apparent activation energy is a measure of temperature sensitivity.
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Kwatia, George, Mustafa Al Ramadan, Saeed Salehi, and Catalin Teodoriu. "Enhanced Cement Composition for Preventing Annular Gas Migration." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95589.
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Abstract Cementing operations in deepwater exhibit many challenges worldwide due to shallow flows. Cement sheath integrity and durability play key roles in the oil and gas industry, particularly during drilling and completion stages. Cement sealability serves in maintaining the well integrity by preventing fluid migration to surface and adjacent formations. Failure of cement to seal the annulus can lead to serious dilemmas that may result in loss of well integrity. Gas migration through cemented annulus has been a major issue in the oil and gas industry for decades. Anti-gas migration additives are usually mixed with the cement slurry to combat and prevent gas migration. In fact, these additives enhance and improve the cement sealability, bonding, and serve in preventing microannuli evolution. Cement sealability can be assessed and evaluated by their ability to seal and prevent any leakage through and around the cemented annulus. Few laboratory studies have been conducted to evaluate the sealability of oil well cement. In this study, a setup was built to simulate the gas migration through and around the cement. A series of experiments were conducted on these setups to examine the cement sealability of neat Class H cement and also to evaluate the effect of anti-gas migration additives on the cement sealability. Different additives were used in this setup such as microsilica, fly ash, nanomaterials and latex. Experiments conducted in this work revealed that the cement (without anti-gas migration additive) lack the ability to seal the annulus. Cement slurries prepared with latex improved the cement sealability and mitigated gas migration for a longer time compared to the other slurries. The cement slurry formulated with a commercial additive completely prevented gas migration and proved to be a gas tight. Also, it was found that slurries with short gas transit times have a decent potential to mitigate gas migration, and this depends on the additives used to prepare the cement slurry.
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Bensted, J. "Retardation of Cement Slurries to 250 degrees F." In Offshore Europe. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/23073-ms.
Full textReports on the topic "Cement slurries"
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Keener, T. C., S. J. Khang, and G. R. Meyers. Evaluation of Ohio fly ash/hydrated lime slurries and Type 1 cement sorbent slurries in the U.C. Pilot spray dryer facility. Final report, September 1, 1993--August 31, 1994. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/57880.
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Keener, T. C., and S. J. Khang. Evaluation of Type I cement sorbent slurries in the U.C. pilot spray dryer facility. Final report, November 1, 1994--February 28, 1996. Office of Scientific and Technical Information (OSTI), July 1996. http://dx.doi.org/10.2172/410330.
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