The National Energy Technology Laboratory, the Japan Oil, Gas and Metals Corporation, U.S. Geological Survey are leading an effort to conduct extended gas hydrate production test in northern Alaska. proposed required drilling of initial stratigraphic well (STW) confirm geologic conditions site. This was completed January 2019 cooperation with Prudhoe Bay Unit Working Interest Owners. Hydrate-01...

The traditional toolface adjustment of a bent-housing motor is time-consuming and laborious. For the goal rapid accurate adjustment, this paper presents an intelligent method based on drill string dynamics model BP (back propagation) neural network, optimized by GA (genetic algorithm). Firstly, for mode rotating at wellhead to change downhole toolface, used calculate value. Then, actual value t...

This study used six fields data alongside correlation heat map to evaluate the field parameters that affect accuracy of bottom hole pressure (BHP) estimation. The oil were acquired using measurement while drilling device collect surface measurements downhole drilling. For two case studies, measured wellbore filled with gasified mud system was utilized, and wellbores drilled rotary jointed drill...

Downhole microseismics has gained in popularity in recent years as a way to characterize hydraulic fracturing sources and to estimate in-situ stress state. Conventional approaches only utilize part of the information contained in the microseismic waveforms such as the P/S amplitude ratio and/or P first motion polarity to determine the microearthquake focal mechanisms and infer stress state. Thu...

During the drilling process, sealing performance of roller cone bits is severely challenged by complex downhole environment and frequent vibrations. In this paper, a comprehensive thermal–fluid–solid–dynamic multi-field coupling numerical model new-generation single energizer metal seals (SEMS2) developed. The instantaneous SEMS2 studied under periodic vibration, shock, random vibration. Time-d...

In downhole drilling systems, self-excited torsional vibrations caused by the bit-rock interactions can affect process and lead to premature failure of components. Especially oscillations higher-order modes critical dynamic loads. The slim drill string design naturally limited drilled borehole diameter limit installation space, power supply numerous potentially modes. Consequently, small robust...

K e y w o r d s F o u r t h g r a d e fluid, Unsteady flow, Lie symmetries. 1. I N T R O D U C T I O N In recent years, considerable efforts have been usefully devoted to the s tudy of flow of nonNewton ian fluids. This is ma in ly due to their m a n y appl icat ions in pe t ro leum drilling, manufactu r ing of food and paper, and other similar activities. A vast a m o u n t of l i te ra ture i...

This paper examines the diverse nature of user reactions to information technology (IT) within the social-historical context of its organizational use. Employing activity theory as a conceptual framework, we conduct an interpretive analysis of physicians work, perceptions, and IT usage experience at a large community hospital to understand why some of these physicians were favorably disposed to...