Thesiss

This thesis aims to develop a comprehensive strategy for automatic control of the ITH percussive drilling process. Such automation would provide the benefits of improved productivity and quality in terms of penetration rate and hole deviation, as well as enhanced hole quality an…

The failure of oil well drillstrings due to torsional and longitudinal stresses 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…

Ultrasonically Assisted Drilling (UAD) has received great interest in the past few years by both academia and industry. The technology has demonstrated a multitude of advantages over conventional drilling technology although its industrial employment has been mainly thwarted by …

The assessment of fragmentation is an important aspect of the design and planning of any excavation. The distribution of fragment sizes in situ helps assess the requirement of explosive energy to excavate the rock material. In addition, the information can also be used to evalua…

Presented in this dissertation are novel models and techniques to analyze the whirling vibration of drillstrings during oil and gas (O&G) operations. Mathematical models are developed to solve for the dynamic whirl response. For this purpose, the drillstring is modeled by a syst…

“Three abilities are the foundation of craftsmanship: to localize, to question and to open up. The first involves making a matter concrete; the second, reflecting on its qualities; the third, expanding its sense. (...) To deploy these capabilities the brain needs to process visu…