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Articles 1 - 7 of 7
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Expandable Proppants For Hydraulic Fracturing, Livio Yang Santos
Expandable Proppants For Hydraulic Fracturing, Livio Yang Santos
LSU Master's Theses
Hydraulic fracturing is recognized as the primary technique to achieve economic oil and gas production from low permeability reservoirs like shale and tight-sand formations. One of the main challenges facing the oil and gas industry is maintaining the proppant functionality in the subsurface where replacement of proppant is only possible by expensive refracturing operations. Proppant crushing and proppant embedment have posed challenges for sustainable production from stimulated wells especially in soft and deep formations like Haynesville Shales. Experimental measurements show the strong impact of proppant stress and proppant embedment on reducing fracture conductivity. In this work, we introduce a new …
The Supercritical Pyrolysis Of 1-Octene, Elizabeth Anne Hurst
The Supercritical Pyrolysis Of 1-Octene, Elizabeth Anne Hurst
LSU Master's Theses
In the pre-combustion environment, fuels for future high-speed aircrafts are predicted to take on increasing heat loads in their role as the primary coolant in order to remove excess heat from engine subsystems. While acting in this role, these fuels are expected to experience temperatures and pressures up to 700 °C and 130 atm, conditions which are supercritical for jet fuels and most hydrocarbons. Such extreme conditions can cause fuel decomposition and subsequent pyrolytic reactions, which can lead to the formation of polycyclic aromatic hydrocarbons (PAH). PAH are precursors to solids deposits that clog fuel-delivery lines, causing reduced engine performance …
A Numerical Investigation Of Wellbore Stability Problems Using An Elastoplastic Model, Chang Huang
A Numerical Investigation Of Wellbore Stability Problems Using An Elastoplastic Model, Chang Huang
LSU Master's Theses
Wellbore stability analysis acts an important role in the drilling design to avoid pipe-stuck, lost circulation and the other instability-induced problems. However, the conventional linear elastic model used by the industry is too conservative in predicting the mud weight window. This project is aimed at improving the accuracy of wellbore stability analysis. An elastoplastic model with Drucker-Prager yield criterion featured by strain hardening is proposed to characterize the rock behavior. Object-oriented finite element analysis simulator, NSMOOM, is programmed in MATLAB. The simulator is verified with the analytical solution in the elastic domain and with the commercial software ABAQUS in the …
Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters, Erika Viana Pagan
Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters, Erika Viana Pagan
LSU Master's Theses
This thesis presents an improved model for gas-liquid two-phase flow in churn and annular flow regimes for small- and large-diameter in vertical and near-vertical pipes. This new model assumes that a net liquid film moves upward along the pipe wall and gas phase moves upward, occupying the majority of the central part of the pipes, and forming a gas core, in both flow regimes. The model is validated using field and laboratory experimental data from several different studies from the literature, in terms of pressure along the wellbore or bottomhole pressure for field conditions (for high-pressure flows in long pipes, …
Extensive Sensitivity Analysis And Parallel Stochastic Global Optimization Using Radial Basis Functions Of Integrated Biorefineries Under Operational Level Uncertainties, Santiago David Salas Ortiz
Extensive Sensitivity Analysis And Parallel Stochastic Global Optimization Using Radial Basis Functions Of Integrated Biorefineries Under Operational Level Uncertainties, Santiago David Salas Ortiz
LSU Master's Theses
This work presents a decision-making framework for global optimization of detailed renewable energy processes considering technological uncertainty. The critical uncertain sources are identified with an efficient computational method for global sensitivity analysis, and are obtained in two different ways, simultaneously and independently per product pathway respect to the objective function. For global optimization, the parallel stochastic response surface method developed by Regis & Shoemaker (2009) is employed. This algorithm is based on the multi-start local metric stochastic response surface method explored by the same authors (2007a). The aforementioned algorithm uses as response surface model a radial basis function (RBF) for …
A Model Compound Study In Syngas Tar Reforming, Jaren Lee
A Model Compound Study In Syngas Tar Reforming, Jaren Lee
LSU Master's Theses
Biomass or coal gasification are promising processes for renewable energy. However, a major operating problem in gasification is what to do with syngas byproducts such as H2S and tars (heavy hydrocarbons) that cause catalyst deactivation downstream. Studies have shown that rare earth oxides (REOs) doped with transition metals are promising catalysts for tar reforming in the presence of sulfur.(R. Li, Roy, Bridges, & Dooley, 2014) In Chapter 1, propane is studied as a model compound for tar reforming with transition metal-doped (e.g., Mn, Fe) REOs. These are compared to a typical commercial Ni/Al2O3 catalyst. The results showed that REO/TM catalysts …
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics, Benjamin Seth Roberts
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics, Benjamin Seth Roberts
LSU Master's Theses
Harmful algal blooms pose a threat to human health and the environment. Many complex factors influence their formation and development, and much is still unknown. One major influencing factor that is well-known yet poorly studied is algal chemotaxis. Many studies have examined chemotaxis in other organisms, but very little about chemotaxis in algae has been studied, largely because existing technology and assay techniques are inadequate. Microfluidics offers many possibilities for cell biology, and has been applied to the study of chemotaxis in other organisms already. These techniques can be applied to the study of algal chemotaxis as well. We present …