ROP modeling chronology, sensitivity analyses, and field data comparisons
MetadataShow full item record
Rate of penetration (ROP), the rate at which a drill bit breaks the rock underneath to deepen the borehole, modeling and measuring is widely used in industry to monitor drilling performance, optimize drilling parameters, detect abnormal pressures, and to improve drilling efficiency. The objective of this project is to run various simulations and models with field data in order to investigate the relationship amongst the parameters that influence rate of penetration and the limitations and advantages of each model. This paper analyzes six models: Bingham’s, Bourgoyne & Young’s, Winters, Warren, and Onyia’s, Hareland’s drag bit, Hareland’s roller bit, and Motahhari’s. An analysis of the models with respect to changes in lithology and with respect to changes in formation is included as an initial check for the models. As expected, the analysis done by formation yielded better results, with an improvement of roughly 5% for each model. When the data sets for wells drilled with drag bits were run for the drag bit models and two other extensive models for comparison, an interesting result occurred. The least amount of errors was always achieved by a non-drag bit model, but Motahhari’s model, a drag bit model, always gave the closest physical interpretation. Using a non-bit specific model, however, may lead to a better initial planning, as the non-drag bit models averaged outputted values closer in magnitude to the real data. This paper provides good practices on how to choose which model to use. As a general assessment, Motahhari’s model should be used for drag bits, and Winters, Warren, and Onyia’s for roller bits. Using other models is dependent on availability of data, well complexity, and desire to expand on design or confirm calculations.
Showing items related by title, author, creator and subject.
A joint multiple discrete continuous extreme value (MDCEV) model and multinomial logit model (MNL) for examining vehicle type/vintage, make/model and usage decisions of the household Sen, Sudeshna (2006)In this dissertation, we seek to contribute to the area of automobile demand modeling by developing a comprehensive econometric model to examine several dimensions of household vehicle holdings and usage decisions. In ...
Modeling residential self-selection in activity-travel behavior models : integrated models of multidimensional choice processes Pinjari, Abdul Rawoof (2008-08)The focus of transportation planning, until the past three decades or so, was to provide adequate transportation infrastructure supply to meet the mobility needs of the population. Over the past three decades, however, in ...