نتایج جستجو برای: under balanced drilling ubd
تعداد نتایج: 1102153 فیلتر نتایج به سال:
The purpose of this study was to develop a novel measurement method using a machine vision system. Besides using image processing techniques, the proposed system employs a detection line algorithm that detects the tool electrode length and drilling depth of a workpiece accurately and effectively. Different boundaries of areas on the tool electrode are defined: a baseline between base and normal...
Microalgae are an attractive source of biomass for fossil fuel alternatives and renewable energy sources. Regardless their potential, the development microalgal biofuels has been limited due to associated economic environmental costs. We followed compared properties six Chlorellaceae strains with a specific interest in lipid-based biofuels. The were cultivated under balanced nutrient limitation...
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...
The INhibitor of Growth tumor suppressors (ING1-ING5) affect aging, apoptosis, DNA repair and tumorigenesis. Plant homeodomains (PHD) of ING proteins bind histones in a methylation-sensitive manner to regulate chromatin structure. ING1 and ING2 contain a polybasic region (PBR) adjacent to their PHDs that binds stress-inducible phosphatidylinositol monophosphate (PtIn-MP) signaling lipids to act...
جریانهای دو یا چند فازی در بسیاری از کاربردهای مهندسی و فرایندهای صنعتی از جمله نیروگاههای هستهای، صنایع نفت و گاز و حفاری زیرتعادلی از اهمیت ویژهای برخوردار هستند، بنابراین مدل سازی دقیق و روش حل مناسب این نوع جریان ها در طراحی بهینه فرآیندها و دستگاههای صنعتی بسیار مهم است. در عملیات حفاری زیرتعادلی (ubd)، کنترل فشار ته چاه در پنجرهی فشار ubd بسیار مهم و ضرورری میباشد. در تحقیق حاضر از...
Shell must cease drilling well before the water freezes over lest a late-season blowout cause oil to accumulate under the ice through the winter.
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