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 19 of 19 for “"Rate of penetration"”.
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Study of penetration and rate of penetration of fuel sprays into air at high density.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1967. B.S.
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Deep Neural Networks for Rate of Penetration Prediction: A Subsurface-Centric Approach Using Well Logs in the Volve Oil Field
Accurate Rate of Penetration prediction is pivotal for optimizing drilling efficiency, yet conventional models often neglect subsurface heterogeneity and rely heavily on operational parameters. This thesis introduces a subsurface-centric deep learning framework for ROP prediction based solely on …
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Deep Neural Networks for Rate of Penetration Prediction: A Subsurface-Centric Approach Using Well Logs in the Volve Oil Field
Accurate Rate of Penetration prediction is pivotal for optimizing drilling efficiency, yet conventional models often neglect subsurface heterogeneity and rely heavily on operational parameters. This thesis introduces a subsurface-centric deep learning framework for ROP prediction based solely on …
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Possible carriers in mouse erythrocytes
… 1896; Hedin, 1897) revealed the wide range of non-electrolyte permeability rates across a cell membrane composed of lipid molecules. Theoretically, water-soluble non-electrolytes such as glycerol, ethylene glycol and erythritol would penetrate less rapidly than lipid-soluble …
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The influence of binder type and cracking on reinforcing steel corrosion in concrete
Two of the main factors affecting the durability of reinforced concrete structures are the level of chlorides required to initiate corrosion and the subsequent rate of penetration of chloride ions through concrete. The primary focus of the current work is the study of how cement extenders impact on …
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Designing neural networks for the prediction of the drilling parameters for Kuwait oil and gas fields
… 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 available data is an important criterion in selecting the most cost efficient bit. History of bit runs …
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A conceptual framework for implementing e-education in KwaZulu-Natal
… is a dissertation presented on the development of e-education in KwaZulu-Natal, beginning with the dawn of the e-education process, covering its development and rate of penetration in previously disadvantaged rural, urban and township areas. The study investigates the problem of applying …
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Penetration in granite by shaped charge liners of various metals
"The penetration in Missouri red granite by cylindrical charges with metal liners of aluminum 2011 (T-3), aluminum 7075 (T-6), yellow brass, monel, maraging steel (vascomax 250), and copper was measured. Metals having high ductility and moderate compressive strength penetrated deeper than high …
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Rate dependent rupture of solid-supported phospholipid bilayers.
… bilayers was performed in order to investigate rate-dependent behavior of force and probability of bilayer rupture. 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) solid-supported lipid bilayers were created on mica using vesicle fusion technique and then ruptured normal to the surface …
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A drilling forensic framework and algorithm for the analysis and diagnoses of drilling dysfunction.
… 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 overall drilling performance, costs, and …
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Integrated dynamical models of down-the-hole percussive drilling
… drilling usually focus on a limited set of the subprocesses underlying it, e.g., the hammer thermodynamics or the interaction between the bit and the rock. Following this paradigm, the assessment of the process performance is typically performed by considering a single percussive …
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Design and development of a tractor-mounted, recording penetrometer
As part of a long term study dealing with the effect of continuous use of no-till practice on soil structural characteristics, this study was conducted with the following objectives: (i) to design and develop a tractor-mounted, hydraulically-operated, recording penetrometer, (ii) to collect the …
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Analytical Modeling and Diagnosis of Penetration Rate Performance of PDC Bits
The high cost of drilling deep (15000+ ft) wells, due to slow rate of penetration (ROP) at depth, has severely limited the utilization and economic significance of deep hydrocarbon resources. The overall objective of this study was to obtain a better understanding of the major cause(s) of slow ROP …
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Development of drilling optimization models for autonomous rotary drilling systems.
… strict environmental policies motivate the use of technology 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 …
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Unconfined compressive strength prediction using drilling parameters and analyzing feature importance through principal components analysis
Knowledge of geomechanical 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. …
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Piles in Sand and in Sand Overlying Clay
This thesis examines the behaviour of single 60mm and 114mm segmented tubular steel piles driven and placed into loose sand and loose sand overlying clay. The soil was placed and instrumented under controlled conditions in a 3.0m diameter by 3.0m deep concrete tank. The 60mm pile was dynamically …
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Predicting tunnel boring machine utilization using discrete event simulation models for hard rocks
… as they have become the dominant mode and method of tunneling around the world. One of the essential steps for justification of the use of TBMs as well as planning the completion time and estimating the cost of projects involving TBMs is estimating the machine performance in given ground …
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A study of internal oxidation in carburising steels
… can play a major detrimental role in the failure of carburised components such as bearings and gears. Internal oxidation leads to a degradation of the surface layer often leading to surface break up and fatigue. This work is concerned with a detailed understanding of the formation of internal …
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Assessing the influence of crack width on the durability potential of cracked concrete using the durability index approach
… and new, are subject to cracking. Irrespective of the cause of the cracking, cracks can increase the rate of penetration of aggressive species into concrete and modify the transport properties. Consequently, the service life of corrosionaffected RC structures may be drastically reduced in the …