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 17 of 17 for “"drilling parameters"”.
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Optimal drilling parameters via geometric programming
Includes bibliographical references.
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Geologic feature prediction using roof bolter drilling parameters
… and data acquisition technologies allow the drilling performance of these roof bolters to be monitored on a real-time basis. Drilling data collected from these machines can be used to determine geological features present in the mine roof. A J. H. Fletcher & Co. roof bolter was fitted with an …
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Unconfined compressive strength prediction using drilling parameters and analyzing feature importance through principal components analysis
… properties is beneficial if not essential for drilling and completion operations in the oil and gas industry. The Unconfined Compressive Strength (UCS) is the maximum compressive force applied to cylindrical rock samples without breaking under unconfined conditions. Unconfined Compressive …
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Designing neural networks for the prediction of the drilling parameters for Kuwait oil and gas fields
… a new methodology was developed to predict the drilling parameters using the Artificial Neural Network. Three models were developed to predict bit type, rate of penetration (ROP), and cost-per-foot (cost/ft), respectively.;The prediction of bit type and other drilling parameters from the current …
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Equilíbrio e vibrações induzidas por vórtices de "risers" de perfuração
Presents a study about drilling risers used by semisubmersible platforms in order to drill wells in deep waters. Firstly, a study about static equilibrium is presented. This allows to select adequate risers for places with usual natural conditions. The selection takes into account the riser …
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Development of an optimised integrated underbalanced drilling strategy for cuttings transport in gas-liquid flow through wellbore annuli.
… fluid flows and the effects of the major drilling variables is critical to optimising underbalanced drilling (UBD) operations, to date, this has been an area of limited research and knowledge. This study contributes to the limited knowledge base by: 1) determining the key operational …
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Development of drilling optimization models for autonomous rotary drilling systems.
… and performance improvement techniques in drilling operations. Traditional drilling methods depend on the effectiveness of the human-driller in the management of operating parameters to improve system performance. Although existing work has identified the need to upscale from manual …
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Physical characteristics and aquatic settlement properties of offshore drill-cuttings.
Drilling operations have been proven to cause pollution in the marine environment. From these environmental concerns, regulations and drilling muds evolved towards more environmental orientated operations. The environmental impact assessment is now compulsory and made public. In order to carry out …
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Hybrid Modelling and Optimisation of Oil Well Drillstrings
… caused by stick-slip phenomena during the drilling operation causes great expense to industry. Due to the complicated and harsh drilling environment, modelling of the drillstring becomes an essential requirement in studies. Currently, this is achieved by modelling the drillstring as a …
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Multivariate Time-Series Deep Learning for Short-Term Forecasting of Lost Circulation in Drilling Operations
… circulation is a frequent and costly problem in drilling operations, often leading to non-productive time, operational delays, and increased risk. Accurate prediction of lost circulation is challenging due to the complex, time-dependent interactions among drilling parameters, formation …
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Peridynamics and Applications
… between the penetration rate and other drilling parameters is investigated. Finally, the Navier-Stokes equation is reformulated in a nonlocal sense via the variable horizon peridynamics. It is shown that the reformulated Navier-Stokes equation satisfies Newton’s second law. When the …
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Valutazione delle performance degli scalpelli da perforazione: studi teorici, analisi dati e valutazioni tecnico-economiche
… Eni E&P and the University of Bologna) studied a drilling model for bit performance evaluation named BI, derived from data recorded while drilling (bit records, master log, wireline log, etc.) and dull bit evaluation. This index is calculated with data collected inside the FDC, a novel …
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High performance simulations of yield stress fluids in a structured adaptive mesh refinement framework with embedded boundaries
… roles in a range of fields, notably in wellbore drilling, which is the application that motivated this project. One aspect of this operation requires displacement of drilling fluid by cement in the annulus between casing and geological surroundings, and both of these fluids are viscoplastics. …
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A drilling forensic framework and algorithm for the analysis and diagnoses of drilling dysfunction.
In the oil and gas industry, drilling wells can be time-consuming, largely influenced by the rate of penetration of the drill bit. Drilling dysfunctions result in wasted energy, reduced penetration rates, and potential damage to the bottom hole assembly or drill bit which can significantly impact …
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Cuttings transport and hydraulics optimisation for underbalanced drilling (UBD) operations in concentric and eccentric, directional and extended reach wells.
Underbalanced drilling facilitates the effective control of wellbore pressures - amongst several other important advantages - when compared to conventional drilling technology. However, this involves the flow of multiphase fluids, which introduces additional complexities due to highly transient …
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Assessment and Modelling of Wear prediction and Bit Performance for Roller Cone and PDC Bits in Deep Well Drilling
Drilling is one of the important aspects in the oil and gas industry due to the high demand for energy worldwide. Drilling time is considered as the major part of the operations time where the penetration rate (ROP) remains as the main factor for reducing the time. Maximizing ROP to lower the …
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An analytical tool wear model for drilling of continuous fibre reinforced composites
… stiffness and good corrosion resistance. Drilling holes to facilitate the mechanical joining of CFRP to other, metallic components is a key operation during aircraft manufacture and high rates of tool wear are experienced in commercial practice. Unmonitored tool wear can lead to increased …