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 23 for “"Wellbores"”.
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Stuck pipe prediction in deviated wellbores: a numerical and statistical analysis.
Due to the significant non-productive times and recovery costs associated with stuck pipe events in oil and gas drilling operations, there is value in being able to predict an impending stuck pipe event. To achieve this, the use of numerical cuttings transport (hole cleaning) models and statistical …
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A Unified Model for Multi-Phase Flow and Heat Transfer in Wellbores
… developed to predict the pressure profiles in wellbores using models available in the literature, which was then used to develop a simulator. A rigorous approach was also taken to model heat transfer and predict the temperature profiles in wellbores unde, various circumstances.</p><p>Our model …
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Experimental investigation of proppant transport and behavior in horizontal wellbores using low viscosity fluids
… proppant transport and behavior in horizontal wellbores using freshwater and high loading friction reducer (HLFR)-based fluids. More specifically, the focus is to experimentally investigate the parameters that have a large influence on proppant distribution between perforation clusters. These …
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Finite element analysis of the internal pressure yield resistance of oil well casing and cemented wellbores
Includes bibliographical references (pages 157-161).
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Wellbore instability mechanisms in clays
This dissertation investigates the stability of wellbores drilled in Ko-consolidated clays using non-linear finite element method (FEM) and effective stress soil models to characterize the behavior of clay and unconsolidated shale formations. Two constitutive models are used: Modified Cam Clay …
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Development of a numerical technique for modelling of multi-stage hydraulic fracturing in shale reservoirs
… analysis is extended to two lateral horizontal wellbores. The main contribution of this part is the detailed investigation of the stress shadowing effects as a function of the fracture spacing at various HF design in adjacent lateral wellbores. A particular attention is devoted to MZF design …
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Wellbore Microannulus Characterization and Seal Repair: Computational and Lab Scale Modeling
… Carbon Capture and Storage (CCS). Pre-existing wellbores penetrate the reservoirs where supercritical CO2 is to be injected. These wellbores can potentially be a pathway for contamination if CO2 leaks through wellbore flaws to an overlying aquifer or the atmosphere. Characterizing wellbore …
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Modeling CO₂ leakage from geological storage formation and reducing the associated risk
… to bring CO₂ plumes into contact with existing wellbores and faults, which can act as pathways for leakage of stored CO₂ Modeling the flux of CO₂ along a leaky pathway requires transport properties along the pathway. We provide an approach based on the analogy between the leakage pathway in …
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Hydrogeological controls of uranium and arsenic mobility in groundwater of the Pine Ridge Reservation, South Dakota
… Groundwater samples were obtained for over 250 wellbores through collaboration with the Oglala Sioux Tribe and Indian Health Service. Cluster analysis was used to delineate differences in groundwater chemistry in these data, and spatial analysis identified four regions, which represent …
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Real-time monitoring of cement sheath integrity under high-angle HPHT wellbore conditions.
… results of a recent engineering study of 15,500 wellbores in the Gulf of Mexico show that, as a wellbore turns fifteen years of age, it develops a fifty percent chance of being adversely affected by sustained casing pressure. Even though a high percentage of the results are for wells in the Gulf …
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Image-Based Pore-Scale Modeling of Inertial Flow in Porous Media and Propped Fractures
Non-Darcy flow is often observed near wellbores and in hydraulic fractures where relatively high velocities occur. Quantifying additional pressure drop caused by non-Darcy flow and fundamentally understanding the pore-scale inertial flow is important to oil and gas production in hydraulic …
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Deep Neural Networks for Rate of Penetration Prediction: A Subsurface-Centric Approach Using Well Logs in the Volve Oil Field
… logs, it enables ROP prediction across entire wellbores and nearby wells lacking historical data. This capability supports proactive bit selection, parameter optimization, and risk mitigation in complex formations, enhancing both efficiency and safety. Validated on the Volve Oil Field dataset, …
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Deep Neural Networks for Rate of Penetration Prediction: A Subsurface-Centric Approach Using Well Logs in the Volve Oil Field
… logs, it enables ROP prediction across entire wellbores and nearby wells lacking historical data. This capability supports proactive bit selection, parameter optimization, and risk mitigation in complex formations, enhancing both efficiency and safety. Validated on the Volve Oil Field dataset, …
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Emergence of Delamination Fractures around Casing and Its Stability
… analysis of cement sheath integrity around wellbores due to presence of a leakage point; 2) Stimulation multi-zone fracturing and its cement sheath integrity during hydraulic fracturing. In this research, the physical mechanism of the loss of wellbore integrity is explained by the combined …
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Stress prediction, fracture detection, and multiple attribute analysis of seismic attributes in a Barnett Shale gas reservoir, Fort Worth Basin, Texas
… networks and to identify portions of existing wellbores where refracturing may contact reservoir bypassed during the original hydraulic stimulation.
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Enhanced reach of a rod injected into a cylindrical constraint by on-off injection and rotation
… of a thin rod into a horizontal pipe to service wellbores in the oil industry, we perform an experimental investigation of the effect of rotating a thin rod as it undergoes on-off injection into a cylindrical constraint. When a thin rod is injected into a cylindrical constraint, the force …
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Some contributions to the hydraulic characterization of fractured bedrock formations
… the sampling and hydraulic assessment of open wellbores completed in heterogeneous formations. A MPS prototype was successfully designed, fabricated, installed, and tested in a well. The MPS advantages included: the minimization of water quality biases and the ability to perform hydraulic tests …
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Solving three-dimensional problems in natural and hydraulic fracture development : insight from displacement discontinuity modeling
… of fracturing from misaligned horizontal wellbores. Results show that the misalignment causes non-planar lateral propagation and restriction in fracture height and fracture width in wellbore part.
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