Literatura académica sobre el tema "Viscous synergy"
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Artículos de revistas sobre el tema "Viscous synergy"
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Ting, Tiew Wei, Yew Mun Hung y Ningqun Guo. "Field-synergy analysis of viscous dissipative nanofluid flow in microchannels". International Journal of Heat and Mass Transfer 73 (junio de 2014): 483–91. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.02.041.
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Herráez, J. V. y R. Belda. "Viscous Synergy of Pure Monoalcohol Mixtures in Water and Its Relation to Concentration". Journal of Solution Chemistry 33, n.º 2 (febrero de 2004): 117–29. http://dx.doi.org/10.1023/b:josl.0000030279.67143.ac.
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Yan, Yajing, Chongfang Song, Wuxuan Pan, Jie Wang y Yifan Bai. "Analysis of Resistance Characteristics and Research into Resistance Reduction of a Tee Based on Field Synergy". Buildings 14, n.º 5 (1 de mayo de 2024): 1271. http://dx.doi.org/10.3390/buildings14051271.
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The resistance loss and energy consumption when fluid flows through a tee in an HVAC system are severe. To improve energy efficiency and reduce carbon emissions, a novel tee with a U-shaped deflector is proposed, supported by experiments and numerical simulations. The resistance reduction mechanism of the U-shaped deflector was analyzed according to the viscous dissipation principle and the field synergy principle. The resistance reduction of the novel tee with different deflector angles and a traditional tee were compared. The results show that the resistance loss of the tee was mainly due to the flow separation and deformation of the fluid in the main branch. The relationship between the local resistance coefficient and the diameter ratio of the main-branch pipe was exponential, and the relationship between the local resistance coefficient and the diameter ratio of the main straight pipe was linear. The total resistance loss reduction rate of the tee with the addition of a 26° deflector was the highest, reaching 72.4%, the volume-weighted average synergy angle increased by 1°, and the viscous dissipation decreased by 21.7%. This study provides a reference for the resistance reduction design of complex local components such as tees in HVAC systems.
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Craig, Michael, Jay Raval, Bruce Tai, Albert Patterson y Wayne Hung. "Effect of Channel Roughness on Micro-Droplet Distribution in Internal Minimum Quantity Lubrication". Dynamics 2, n.º 4 (14 de octubre de 2022): 336–55. http://dx.doi.org/10.3390/dynamics2040019.
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This research studied the effect of channel roughness on micro-droplet distributions in internal minimum quantity lubrication for effective machining. Mixtures of different oils and air were flown though internal channels with simulated different roughness: as fabricated, partially threaded, and fully threaded. The airborne droplets were collected, analyzed, and compared with simulated results by computational fluid dynamics. For low-viscous lubricant, the rough channel surface helped to break large droplets in the boundary layer into smaller droplets and reintroduce them into the main downstream flow. The opposite trend was found for the higher viscous lubricant. The study also performed chemical etching to roughen selected surfaces of carbide cutting tools. The synergy of hand and ultrasonic agitation successfully roughened a carbide surface within twelve minutes. Scanning electron microscopy examination showed deep etching that removed all grinding marks on a WC–Co cutting tool surface.
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Aiyer, Aditi, Simone K. Visser, Peter Bye, Warwick J. Britton, Gregory S. Whiteley, Trevor Glasbey, Frederik H. Kriel, Jessica Farrell, Theerthankar Das y Jim Manos. "Effect of N-Acetylcysteine in Combination with Antibiotics on the Biofilms of Three Cystic Fibrosis Pathogens of Emerging Importance". Antibiotics 10, n.º 10 (27 de septiembre de 2021): 1176. http://dx.doi.org/10.3390/antibiotics10101176.
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Cystic fibrosis (CF) is a genetic disorder causing dysfunctional ion transport resulting in accumulation of viscous mucus that fosters chronic bacterial biofilm-associated infection in the airways. Achromobacter xylosoxidans and Stenotrophomonas maltophilia are increasingly prevalent CF pathogens and while Burkholderia cencocepacia is slowly decreasing; all are complicated by multidrug resistance that is enhanced by biofilm formation. This study investigates potential synergy between the antibiotics ciprofloxacin (0.5–128 µg/mL), colistin (0.5–128 µg/mL) and tobramycin (0.5–128 µg/mL) when combined with the neutral pH form of N-Acetylcysteine (NACneutral) (0.5–16.3 mg/mL) against 11 cystic fibrosis strains of Burkholderia, Stenotrophomonas and Achromobacter sp. in planktonic and biofilm cultures. We screened for potential synergism using checkerboard assays from which fraction inhibitory concentration indices (FICI) were calculated. Synergistic (FICI ≤ 0.5) and additive (0.5 > FICI ≥ 1) combinations were tested on irreversibly attached bacteria and 48 h mature biofilms via time-course and colony forming units (CFU/mL) assays. This study suggests that planktonic FICI analysis does not necessarily translate to reduction in bacterial loads in a biofilm model. Future directions include refining synergy testing and determining further mechanisms of action of NAC to understand how it may interact with antibiotics to better predict synergy.
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Somigliana, Alice, Leonardo Testi, Giovanni Rosotti, Claudia Toci, Giuseppe Lodato, Benoît Tabone, Carlo F. Manara y Marco Tazzari. "The Time Evolution of Md/Ṁ in Protoplanetary Disks as a Way to Disentangle between Viscosity and MHD Winds". Astrophysical Journal Letters 954, n.º 1 (29 de agosto de 2023): L13. http://dx.doi.org/10.3847/2041-8213/acf048.
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Abstract As the classic viscous paradigm for protoplanetary disk accretion is challenged by the observational evidence of low turbulence, the alternative scenario of MHD disk winds is being explored as being potentially able to reproduce the same observed features traditionally explained with viscosity. Although the two models lead to different disk properties, none of them has been ruled out by observations—mainly due to instrumental limitations. In this work, we present a viable method to distinguish between the viscous and MHD framework based on the different evolution of the distribution in the disk mass (M d )–accretion rate ( M ̇ ) plane of a disk population. With a synergy of analytical calculations and 1D numerical simulations, performed with the population synthesis code Diskpop, we find that both mechanisms predict the spread of the observed ratio M d / M ̇ in a disk population to decrease over time; however, this effect is much less pronounced in MHD-dominated populations compared with purely viscous populations. Furthermore, we demonstrate that this difference is detectable with the current observational facilities: we show that convolving the intrinsic spread with the observational uncertainties does not affect our result, as the observed spread in the MHD case remains significantly larger than in the viscous scenario. While the most recent data available show a better agreement with the wind model, ongoing and future efforts to obtain direct gas mass measurements with Atacama Large Millimeter/submillimeter Array and next-generation Very Large Array will cause a reassessment of this comparison in the near future.
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Roy, Mahendra Nath y Biswajit Sinha. "Viscous synergy and isentropic compressibility of some monoalkanols and cyclic ethers in water at 298.15 K". Journal of Molecular Liquids 133, n.º 1-3 (marzo de 2007): 89–99. http://dx.doi.org/10.1016/j.molliq.2006.07.009.
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Zhang, Lufeng, Haibo Wang, Fujian Zhou y Jianye Mou. "Numerical Simulation of Wormhole Propagation with Foamed-Viscoelastic-Surfactant Acid in Carbonate Acidizing". Processes 11, n.º 6 (19 de junio de 2023): 1839. http://dx.doi.org/10.3390/pr11061839.
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Successful matrix acidizing for extremely thick carbonate reservoirs with long horizontal well sections and strong heterogeneity requires efficient temporary plugging and diverting of acid fluid, ensuring acid fluid distribution to each production layer. Foamed-viscoelastic-surfactant (Foamed-VES) acid combines the benefits of both foam acid and viscoelastic surfactant (VES) acid, integrating foam plugging and viscous plugging. It can achieve uniform acid distribution in highly heterogeneous reservoirs. However, little research has been conducted on the wormhole propagation law of foamed-VES acid. To address this gap, this study established a mathematical model of foamed-VES acid wormhole propagation based on the dual-scale model. The model was coupled with a random porosity distribution generated with geological statistical software. The effects of different factors on foamed-VES acid etching were simulated. Numerical results show that foamed-VES acid can stimulate low-permeability reservoirs with a permeability differential of 20. Its inherent mechanism lies in the synergy of foam plugging and VES viscous plugging. This study enhances our understanding of the acid diversion mechanism of foamed-VES acid, providing a theoretical foundation for on-site acidizing treatment.
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Ren, Diandong, Rong Fu, Robert E. Dickinson, Lance M. Leslie y Xingbao Wang. "Aviation Impacts on Fuel Efficiency of a Future More Viscous Atmosphere". Bulletin of the American Meteorological Society 101, n.º 10 (1 de octubre de 2020): E1761—E1780. http://dx.doi.org/10.1175/bams-d-19-0239.1.
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AbstractAircraft cruising near the tropopause currently benefit from the highest thermal efficiency and the least viscous (sticky) air, within the lowest 50 km of Earth’s atmosphere. Both advantages wane in a warming climate, because atmospheric dynamic viscosity increases with temperature, in synergy with the simultaneous engine efficiency reduction. Here, skin friction drag, the dominant term for extra aviation fuel consumption in a future warming climate, is quantified by 34 climate models under a strong emissions scenario. Since 1950, the viscosity increase at cruising altitudes (∼200 hPa) reaches ∼1.5% century‒1, corresponding to a total drag increment of ∼0.22% century‒1 for commercial aircraft. Meridional gradients and regional disparities exist, with low to midlatitudes experiencing greater increases in skin friction drag. The North Atlantic corridor (NAC) is moderately affected, but its high traffic volume generates additional fuel cost of ∼3.8 × 107 gallons annually by 2100, compared to 2010. Globally, a normal year after 2100 would consume an extra ∼4 × 106 barrels per year. Intermodel spread is <5% of the ensemble mean, due to high inter–climate model consensus for warming trends at cruising altitudes in the tropics and subtropics. Because temperature is a well-simulated parameter in the IPCC archive, with only a moderate intermodel spread, the conclusions drawn here are statistically robust. Notably, additional fuel costs are likely from the increased vertical shear and related turbulence at NAC cruising altitudes. Increased flight log availability is required to confirm this apparent increasing turbulence trend.
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Roy, Mahendra Nath y Anuradha Sinha. "Viscous synergy and antagonism and isentropic compressibility of ternary mixtures containing 1,3-dioxolane, water and monoalkanols at 303.15K". Fluid Phase Equilibria 243, n.º 1-2 (mayo de 2006): 133–41. http://dx.doi.org/10.1016/j.fluid.2006.02.023.
Texto completoTesis sobre el tema "Viscous synergy"
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Nguyen, Dang Dan. "Revêtements polymères sous contraintes environnementales couplées". Phd thesis, Université de La Rochelle, 2012. http://tel.archives-ouvertes.fr/tel-01065519.
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L'objectif de notre étude est de mettre en évidence les synergies existantes entre les différents facteurs de vieillissement lors de la dégradation d'un revêtement polymère modèle, représentatif d'une peinture anticorrosion.Notre travail a consisté à suivre le vieillissement hygrothermique du système DGEBA/TETA sous forme de film libre et de revêtement déposé sur substrat acier dans différentes solutions (eau pure et NaCl 3%) pour différentes températures et contraintes mécaniques visco-élastique appliquées. Nos résultats ont montré que le programme de cuisson affectait les propriétés physico-chimiques et mécaniques du système initial et que l'absorption d'eau, non homogène, suivait une loi non-Fickienne, suite à un phénomène de gonflement.La prise en eau et la diffusion ont été caractérisées par gravimétrie et spectroscopie d'impédance électrochimique. Nos résultats montrent que les propriétés barrière du revêtement diminuent avec la quantité d'eau absorbée et avec la température de vieillissement. Cependant, la contrainte plane appliquée sur le système tend à contrarier cet effet. La formalisation de nos observations expérimentales dans le cadre d'une approche thermodynamique a montré l'effet prépondérant de la partie entropique par rapport à la partie enthalpique de l'énergie d'activation des processus de transport de l'eau, en raison de l'orientation des chaînes sous l'action de la contrainte. De plus, une diminution de la permittivité relative du revêtement sec a été observée en fonction de la température et de la contrainte appliquée, indépendamment de son signe (tension ou compression). Dans ce cas, la contribution enthalpique semble être prépondérante.
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Bouvet, Geoffrey. "Relations entre microstructure et propriétés physico-chimiques et mécaniques de revêtements époxy modèles". Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS039/document.
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Ce travail de thèse porte sur l’étude et la mise en évidence de relations microstructure-propriétés dans des revêtements modèles à base époxy représentatifs de peinture anticorrosion. Ces relations sont établies aussi bien à l’état initial que lors de vieillissements hygrothermiques. Cette étude a tout d’abord consisté à caractériser les propriétés physico-chimiques et mécaniques du système stœchiométrique DGEBA/DAMP totalement réticulé. Ces propriétés ont été comparées à celles du système DGEBA/TETA et ont permis de montrer la forte influence de la microstructure sur ces propriétés initiales. Des vieillissements hygrothermiques cycliques à différentes températures sur films libres ont été effectués pour mesurer l’impact de la microstructure sur la durabilité des systèmes époxy. Ces travaux ont pu montrer l’influence des interactions eau-polymère dans les phénomènes de diffusion. De plus, les évolutions de certaines propriétés physico-chimiques et mécaniques ont pu être caractérisées à l’aide de la DMA (mors submersibles), lors des différentes étapes de sorption-désorption. Un comportement pseudo-fickien a pu être mis en évidence lors de la première sorption, suivi d’un comportement fickien lors des autres étapes. Les causes inhérentes à cette évolution ont pu être avancées, en mettant en jeu des réorganisations microstructurales des systèmes époxy étudiés. D’autres vieillissements hygrothermiques ont été réalisés à l’aide de la SIE sur des revêtements pour étudier l’effet de l’interface revêtement/substrat acier sur les phénomènes de diffusion, notamment le rôle des contraintes résiduelles. L’influence de la contrainte visco-élastique sur les phénomènes de prise en eau des revêtements a finalement été étudiéeThis work highlights the microstructure-properties relations inside representative epoxy based model coatings for anticorrosion paints. These relations have been established for the initial state as well as the hygrothermal ageing. First, we characterised physico-chemical and mechanical properties of the totally crosslinked DGEBA/DAMP stoichiometric system. These properties have been compared to the DGEBA/TETA system and they showed the strong influence of the microstructure on these initial properties. Cyclic hygrothermal ageing have been completed at different temperatures on free films, in order to measure the impact of the microstructure on the durability of epoxy systems. This work has shown the influence of the water-polymer interactions on diffusion phenomena. Moreover, the evolutions of several physico-chemical and mechanical properties have been characterised using DMA (submersible clamps), during different sorption-desorption steps. A pseudo-fickian behaviour has been evidenced during the first sorption, and it was followed by a fickian behaviour for all other steps. The inherent causes of this evolution have been proposed, by considering microstructural reorganisations of the studied epoxy systems. Other hygrothermal ageing have been carried out using EIS on coatings, in order to study the effects of the coating/steel substrate interface on diffusion phenomena, especially the role of residual stresses. We finally studied the influence of the visco-elastic stress on the coating water intake phenomena
Capítulos de libros sobre el tema "Viscous synergy"
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Souza, Ruthe Lima de, Rychaellen Silva de Brito, Fabrício Rivelli Mesquita, Maria Cristina de Souza, Marcelo Castanheira da Silva, Bráulio Soares Archanio, William Ferreira Alves y Luan de Oliveira Nascimento. "Evaluation of the Fungitoxic Activity of Copaiba Oil (Copaifera spp.) from Western Amazon against Anthracnose (Colletotrichum gloeosporioides (Penz.) Penz. & Sacc.) in Papaya (Carica papaya L.)". En Harmony of Knowledge: Exploring Interdisciplinary Synergie. Seven Editora, 2023. http://dx.doi.org/10.56238/sevened2023.006-056.
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The genus Copaifera is not only relevant to the timber industry but also stands out for its resin oil, a transparent, viscous, and fragrant exudate. This product, commonly used in folk medicine, symbolizes the wealth of forest-derived products and their appreciation. In line with the Sustainable Development Goals (SDGs) metrics, it is essential that its exploitation is linked to sustainability, promoting regional development and emphasizing the importance of protecting and valuing the region's natural resources. Therefore, the objective of this study was to evaluate the physicochemical characteristics of Copaiba resin oil varieties collected at farmers' markets and assess its fungicidal potential in controlling Colletotrichum gloeosporioides, the causative agent of papaya anthracnose (Carica papaya). The fungus Colletotrichum gloeosporioides was isolated from diseased papaya fruits. The following treatments were used: a control and doses of 50, 100, 150, and 200 μL/mL of Copaiba oil, with each dose incorporated into 20 mL of BDA (Potato, Dextrose, and Agar) culture medium, to determine the effect of the oil on the mycelial growth of the phytopathogen. The data were subjected to analysis of variance (ANOVA) and regression analysis. When evaluating the effect of oil varieties, it was found that the greatest inhibitory effect was observed for variety 2, with the highest inhibition power caused by doses of 100 and 200 μL/mL in variety 2.
Actas de conferencias sobre el tema "Viscous synergy"
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AlSofi, Abdulkareem M., Jinxun Wang, Abdullah M. AlBoqmi, Mohammad B. AlOtaibi, Subhash C. Ayirala y Ali A. AlYousef. "SmartWater Synergy with Chemical EOR for a Slightly Viscous Arabian Heavy Reservoir". En SPE Heavy Oil Conference and Exhibition. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/184163-ms.
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Zhangaliyev, Medet Maratovich, Muhammad Rehan Hashmet y Peyman Pourafshary. "Laboratory Investigation of Hybrid Nano-Assisted-Polymer Method for EOR Applications in Carbonate Reservoirs". En Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31398-ms.
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Abstract Currently, there has been a surge in evaluating the effectiveness of various hybrid enhanced oil recovery (EOR) methods as they combine the benefits of standalone processes. This study focuses on laboratory investigation to evaluate synergy between polymer and nanoparticles (NP), as their combination can simultaneously alter capillary and viscous forces. N-vinyl-pyrrolidone-based partially hydrolyzed polyacrylamide and silica oxide nanoparticles are used in this study. The standalone polymer, nanofluid (NF), and combined polymer-nanofluid solutions are prepared in different salinities (1200-40,000 ppm). The zeta potential of solutions is measured to determine the stability of NF at various salinities. Contact angle measurements are performed to determine the optimum concentration of NP. A series of rheological experiments are accomplished at different nanoparticle concentrations (0.05, 0.1, 0.15 wt%), temperatures (25-80 °C), and polymer concentrations (500 to 3000 ppm). Additionally, a long-term stability test was conducted over thirty days at 80°C on nano-assisted-polymer fluid over a long period. Zeta potential results proved that the stability of nanofluids decreases with an increase in solution salinity. However, the addition of polymer has a positive impact on the stability of NF and is stable up to 40 000 ppm salinity. The nanoparticles have shown potential in altering the wettability of the rock toward the intermediate wet conditions. A maximum deviation of 55° in contact angle is observed for a 0.1 wt% NP solution and is selected as optimum concentration. Rheology studies illustrate that the addition of NP increases the viscosity of the polymer solution by 25%. All nano-assisted-polymer solutions tested in this study showed shear thinning behavior. Long-term thermal stability of nano-assisted-polymer solution indicates that the solution achieves equilibrium after 5 days and maintains target viscosity of 4 cP. The addition of polymer has positively impacted the salinity tolerance of nanoparticles. Additionally, nanoparticles improved the viscosity of the polymer solution. This study will open new doors for the hybrid EOR method.
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Bianchi, Dino, Paolo Noccioni y Catherine J. Silvestri. "The New PGT5B/2: A State-of-the-Art 6MW Two-Shaft Gas Turbine". En ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0561.
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The new PGT5B is a compact, state-of-the-art, 6 MW industrial gas turbine. The unit is available in two configurations: a single shaft for power generation and a two-shaft for mechanical drive applications. Maximum commonality has been maintained between the single and two shaft models. Both units share a common gas generator, with evident benefits in all the installations where mixed operations are required. The two-shaft engine is simply obtained by removing the second stage turbine from the single shaft unit and adding a two-stage power turbine. The unit is an evolution of the existing PGT5, building on the experience of the successful PGT10 model. The synergy between GE Aircraft Engines and GE Power System Nuovo Pignone, with the benefit of GE’s Six Sigma Total Quality Methodology, has permitted the application of the most advanced technology in the development of the major components of the engine. The high efficiency axial compressor is a scaled down version of the successful PGT10B, chosen as the base compressor for the new PGT’s product line. It has been obtained by the combination of advanced fully 3D aero-design, custom airfoil shape and blade stacking optimization. The annular DLE, dual fuel combustion system, developed according to the proven aircraft engines design, is able to satisfy the most stringent environmental regulations. The axial turbine, with sophisticated air cooling system, is designed to reach high values of firing temperature consistent with future uprates. The application of advanced CFD analysis using 3D viscous multi-rows codes and unsteady simulation has resulted in a very high efficiency turbine. The two stage uncooled power turbine capitalizes on Nuovo Pignone’s experience in the mechanical drive market. While the single shaft version is particularly suitable for power generation and cogeneration due to the high exhaust temperature, the two-shaft version, with wide operating speed range, is designed to be a reliable and efficient mechanical drive for compressors and pumps. The Power Turbine speed for optimum application efficiency (up to 34.%) is 12,500 rpm, with a capability range from 50% to 105% of nominal speed. The flexibility of the standard package satisfies the different installation requirements of oil and gas market. The simplicity of construction and the modular design concept of both the engine and package facilitate maintenance and reduce downtime and labor during servicing.
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Barreiro, Jose A., John S. Knowles, Carl R. Johnson, Iain D. Gordon y Lene K. Gjerde. "Successful Application of a Reinforced Composite Mat Pill Technology for Lost Circulation Control in the Norwegian Continental Shelf". En SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204062-ms.
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Abstract An operator in the Norwegian continental shelf (NCS) required sufficient zonal isolation around a casing shoe to accommodate subsequent targeted injection operations. Located in the Ivar Aasen field, and classified as critical, the well had a 9 ⅝-in. casing shoe set in the depleted Skagerrak 2 reservoir. The lost circulation risk was high during cementing because the Hugin formation, located above the reservoir, contained 40 m [~ 131.2 ft] of highly porous and permeable sandstone. During previous operations in the field, lost circulation was observed before and during the casing running and cementing operations. After unsuccessful attempts to cure the losses with various lost circulation materials, a new solution was proposed to target the specific lost circulation problem by combining two types of reinforced composite mat pill (RCMP) technology. Specifically, the first type of RCMP technology was engineered for use in the viscous preflush spacer, and the second was applied to the cement slurry itself. Working in synergy, the RCMP systems mitigated the risk of incomplete zonal isolation. With no losses observed upon reaching total depth (TD) for the 12 ¼-in. hole, the 9 ⅝-in. casing was run with a reamer shoe and 15 rigid centralizers. Between 2700 and 2728 m [~ 8,858 and 8,950 ft] measured depth (MD), the rig observed constant drag of 30 to 40 MT whilst working the casing down, and circulation was completely lost before partial returns were eventually observed. The rig continued to work the string down to the planned landing depth at 3897 m [~ 12,785 ft] MD. Precementing circulation ensued with staged pump rates increasing at 100-L/min [~ 0.6-bbl/min] intervals up to 1400 L/min [~ 8.8 bbl/min], which induced losses at a rate of 6.5 m3/hour [~ 40 bbl/hour]). Subsequently, the flow rate was reduced to 1300 L/min [~ 8.1 bbl/min], and the annular volume was circulated 2.6 times with full returns. Attempts to reduce equivalent circulating density (ECD) ahead of the cementing operation were implemented at 1300 L/min [~ 8.1 bbl/min] using a low-density, low-rheology oil-based drilling fluid pill. However, a significant loss rate of 18.0 m3/hour [~113 bbl/hour] was observed. The flow rate was reduced to 950 L/min [~ 6.0 bbl/min], and partial circulation was recovered. After the spacer and cement had reached the annulus, full returns were immediately observed and continued until the top plug was successfully bumped. Acoustic logging determined that the operation had achieved the primary job objective of establishing the required length of hydraulically isolating cement in the annulus. Lost circulation is a costly problem that can be difficult to solve, even with the wide variety of technologies available (Vidick, B., Yearwood, J. A., and Perthuis, H. 1988. How To Solve Lost Circulation Problems. SPE-17811-MS). This case study demonstrates a successful solution. The operator will be able to incorporate lessons learned and best practices into future operations, and these lessons and practices will be useful to other operators with similar circumstances.