Design and Exploitation Problems of Drill String in Directional Drilling [PDF]
, 2004 Drill string design for directional drilling requires accounting for a number of factors. First, types and expected values of loads should be determined.
Bednarz Stanislaw
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European Journal of Social Psychology, EarlyView.ABSTRACT Ecological models explain social phenomena by assuming specific properties of the world an individual lives in. The evaluative information ecology model (Unkelbach et al. 2019) assumes two such properties: Positive information is more frequent (i.e., positivity prevalence), but negative information is more diverse (i.e., negativity diversity).
Anne I. Weitzel, Christian Unkelbach
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Визначення напружень у бурильній колоні з урахуванням особливостей взаємодії зі стінкою криволінійного стовбура [PDF]
, 2008 Рассмотрена методика определения нормальных напряжений в поперечном сечении бурильной колонны, работающей в криволинейном участке скважины. При расчете учтены силы взаимодействия колонны со стенкой ствола, собственный вес и растягивающие усилия.The ...
Артим, В. І. +2 more
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Acoustical properties of drill strings
The Journal of the Acoustical Society of America, 1989 The recovery of petrochemical and geothermal resources requires extensive drilling of wells to increasingly greater depths. Real-time collection and telemetry of data about the drilling process while it occurs thousands of feet below the surface is an effective way of improving the efficiency of drilling operations.
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FlexMat, EarlyView.Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu +3 more
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Permian Large Igneous Provinces and Their Paleoenvironmental Effects
Geophysical Monograph Series, Page 417-434., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jun Chen, Yi‐Gang Xu
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Proportional-Derivative Control of Stick-Slip Oscillations in Drill-Strings
MATEC Web of Conferences, 2018 Stick-slip oscillation in drill-string is a universal phenomenon in oil and gas drilling. It could lead to the wear of drill bit, even cause catastrophic failure of drill-strings and measurement equipment.
Lin Wei, Liu Yang
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Acoustical properties of drill strings: Application [PDF]
The Journal of the Acoustical Society of America, 1988 Analysis has demonstrated a viable data transmission system for communicating by acoustical carrier waves in drill strings used to drill wells. Because of the periodic structure of this waveguide, complex transmission characteristics exist. Two experiments have been used to study these phenomena.
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Journal of Clinical Psychology, Volume 81, Issue 6, Page 526-537, June 2025.ABSTRACT Deliberate Practice (DP) is a model of behavioral skill acquisition structured by several key tasks. The past decade has shown a consistent growth in interest in this form of learning for psychotherapy skills, with promising research suggesting DP training is superior to traditional learning methods of psychotherapy. This paper presents a case
Dan Sacks
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Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String
Shock and Vibration, 2016 A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation.
Fushen Ren +4 more
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