Results 161 to 170 of about 14,166 (227)

Development of a rock-bit interaction analytical model by considering the in-situ stresses for a bottom-hole element. [PDF]

Sci Rep
Zafarian H, Ameri MJ, Dolatyari A.
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Mitochondrial ROS drive foam cell formation via STAT5 signaling in atherosclerosis. [PDF]

Sci Adv
Boccuni L, Marka F, Salzmann M, Schirripa A, Ableitner E, Siller M, Brekalo M, Haider P, Stojkovic S, Neumayer C, Örd T, Kollmann K, Assinger A, Decker T, Köcher T, Fischer MB, Mußbacher M, Bergthaler A, Hengstenberg C, Podesser BK, Kaikkonen MU, Wojta J, Hohensinner PJ.   +22 more
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Quantum-driven frequency stability in Indian prospect smart grid with electric vehicle charging station integration and real-time hardware validation. [PDF]

Sci Rep
Kaleeswari M, Sivakumar P, Aswini A.
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Optimal AGC regulators for power systems under restructured configuration with hybrid ESS. [PDF]

Sci Rep
Mishra RN, Kumar N, Zuhaib M, Abdullah Sufyan MA.   +3 more
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Small molecule-mediated rapid generation of functional human astrocytes: unveiling AKT1-STAT1/3 signaling in astrocyte development. [PDF]

Stem Cell Res Ther
Garg P, Lenk K, Sundaram SM.
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Modeling of Cutting Rock: From PDC Cutter to PDC Bit—Modeling of PDC Bit

SPE Journal, 2021
Summary In this paper, we integrated our polycrystalline diamond compact (PDC) cutter model (Chen et al. 2021) into a PDC bit model that can predict the weight on bit (WOB), torque on bit (TOB), and imbalanced side force on a bit under given drilling conditions.
Pengju Chen, Stefan Miska, Mengjiao Yu, Evren Ozbayoglu   +3 more
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PDC Bit Dynamics

IADC/SPE Drilling Conference, 1992
ABSTRACT The poor performance of PDC bits in harder formations is caused by downhole vibrations. However, proper operating conditions (i.e. low rotary speed and high weight on bit) and new technology for vibration control (anti-whirl PDC bits and a soft-torque rotary system) can successfully extend the application of PDC bits to harder ...
J. M. Hanson, W. R. Hansen
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Modeling of Cutting Rock: From PDC Cutter to PDC Bit—Modeling of PDC Cutter

SPE Journal, 2021
Summary The main purpose of this paper is to present our polycrystalline diamond compact (PDC) cutter model and its verification. The PDC cutter model we developed is focused on a PDC cutter cutting a rock in 3D space. The model studies the forces between a cutter and a rock and applies the theory of poroelasticity to calculate the ...
Pengju Chen, Stefan Miska, Mengjiao Yu, Evren Ozbayoglu   +3 more
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Classification of PDC Bits According to Their Steerability

Proceedings of SPE/IADC Drilling Conference, 2003
Abstract With the emergence of rotary steerable systems, the technical issue concerning the bit design for a specific directional application has reappeared. Today, a bit must be specifically designed for use with a particular directional system: rotary bottom hole assembly (BHA), steerable mud motor or rotary steerable system (RSS). The
S. Menand, H. Sellami, C. Simon
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