Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"flow assurance"”.
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Reliability evaluation for a subsea to shore production system
… and the relationship between reliability and flow assurance. The offshore production system is assumed as a multi-state system and treated with the universal generating function approach. Based on probability analysis the system reliability for all probable production scenarios has been …
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Development of hydrate risk quantification in oil and gas production
Subsea flowlines that transport hydrocarbons from wellhead to the processing facility face issues from solid deposits such as hydrates, waxes, asphaltenes, etc. The solid deposits not only affect the production but also pose a safety concern; thus, flow assurance is significantly important in …
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Dynamics and rheology of soft phase-change materials
… major issues for upstream production and flow assurance.
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Multiphase flow modeling and deposition of hydrates in oil and gas pipelines
Multiphase flow is a ubiquitous feature of oil and gas production and hence, all flow assurance issues involve multiphase flow. The risk of plugging due to gas hydrate formation remains one of the most prevailing flow-assurance problems in deepwater subsea oil and gas operations. Due to the …
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The rheological complexity of waxy crude oils : yielding, thixotropy and shear heterogeneities
… crude oil rheology is critical for developing flow assurance strategies, which can in turn ensure continuous production of precipitate-containing crude oils under adverse conditions. The three phenomena studied are, first: shear heterogeneities, i.e. the manifestation of wall slip, shear …
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Application of superparamagnetic nanoparticle-based heating for non-abrasive removal of wax deposits from subsea oil pipelines
Flow assurance is a critical problem in the oil and gas industry, as an increasing number of wells are drilled in deep water and ultra-deep water environments. High pressures and temperatures as low as 5°C in these environments hinder flow of hydrocarbon-based fluids by formation of methane hydrate …
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Thermodynamic Formation Conditions for Propane Hydrates in Equilibrium with Liquid Water
… presence of liquid water is important to avoid flow assurance issues in processing, storage and transportation of liquefied petroleum gas, as well as modeling hydrate based separation processes involving type II hydrates. Experimental dissociation conditions were measured using the phase …
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New Insights into the Mitigation of Asphaltene Deposition and the Utilization of Asphaltene Deposits
Asphaltene deposition is an ongoing flow assurance problem in the oil and gas industry that is associated with huge economic loss. Different aspects to this problem which includes asphaltene stability, asphaltene deposition and asphaltene characterization has been studied over the past few decades. …
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Caracterização estrutural, dinâmica e reológica de suspensões coloidais via simulação molecular
… and asphaltenes, cause problems related to flow assurance. In the early stages of solid precipitation process gels and/or colloidal suspensions are formed. It is necessary studiyng the particle aggregation dynamics to understanding the dynamic mechanisms of paraffins and asphaltenes …
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Hydrate-phobic surfaces
… thermodynamic or kinetic inhibitors into the flow, heating the pipe walls, or managing the flow of formed hydrates. These methods are expensive and energy intensive. An alternative approach involves reducing the adhesion of hydrates to surfaces, ideally to a low enough level that the force of …
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Implications for gas hydrate occurrence : 3D thermobaric modelling of central Spitsbergen
… operations, particularly with respect to flow assurance in pipelines and slope stability. They occur where gas migrates through environments characterised by moderate pressures and low temperatures. Gas hydrates thus naturally occur in two main settings, i.e., a deepmarine, offshore …
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Electrical treatment of waxy model oil to improve its cold mobility
… at low temperatures can pose significant flow assurance challenges during offshore transportation of waxy crude oils. The sharp increase of viscosity due to wax precipitation increases the pressure drop and thus raises the capital and operating cost of transportation. Conventional methods …
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Rheometry and direct flow observations of a model wax-oil system
… using a combined approach of rheology and flow measurement techniques. We describe the design, fabrication and calibration of a quantitative flow imaging apparatus that enables measurements of the local kinematics within the model fluid using Particle Image Velocimetry (PIV). This Rheo-PIV …
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Establishing scale inhibitor retention mechanisms in pure adsorption and coupled adsorption/precipitation treatments
… return process in the low concentration flow regime. However, the additional SI “loading” within the near wellbore formation may be greatly enhanced by precipitation. The dynamic effects of adsorption and precipitation, also have a strong bearing on a field squeeze treatment and may …
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Situation awareness approach to context-aware case-based decision support.
… Implementation of the two approaches in flow assurance control domain to predict the formation of hydrate shows improvements in both similarity assessment and problem solving predictions compared to CACBDSS without SA. Specifically, the second approach provides an improved decision …
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Capillary forces and wetting dynamics by diffuse-interface modeling
… for example, can drastically change the flow behavior due to capillary bridging between the particles. The study of these three-phase systems is especially relevant to the petroleum industry, where gas hydrates forming large clusters in subsea pipelines during crude oil transportation is …
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Investigation of Asphaltene Adsorption at Liquid-Liquid and Liquid-Solid Interfaces
… for a better management of asphaltene-related flow assurance problems in crude oil recovery.</p>
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A mechanistic investigation of nonlinear interfacial instabilities leading to slug formation in multiphase flows
… applications involve the transport of multiphase flows through pipes. For instance, the design and operation of oil pipelines and production facilities relies heavily on understanding the hydrodynamics of inultiphase flow. Industrial engineers utilizes multiphase flow simulators to aid in the …
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Separation and characterization of crude oils and investigation of their wetting properties on rock surfaces
… asphaltenes are one of the major contributors flow assurance issues. It can significantly affect oil field production by depositing and blocking wells and flowlines. In this study, asphaltenes are fractionated into four parts based on their solubility in n-pentane, n-hexane, n-heptane, and …
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On the theory of Brownian aggregation in colloidal dispersions
Brownian aggregation kinetics is a topic of interest for colloidal dispersions, macromolecular fluids, nanoparticle self-assembly, and biochemical reactions. The manipulation of colloidal dispersion stability by containing or promoting aggregation rates is manifest in several natural phenomena and …
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