Results 61 to 70 of about 1,123,828 (350)
Journal of Petroleum Exploration and Production Technology, 2021 Increasing drilling speed and efficiency of hard formation for deep and ultra-deep well is one of the international recognized drilling problems and key technologies to be tackled urgently.
T. Fang +4 more
semanticscholar +1 more source
Advanced Materials Interfaces, EarlyView.A multifunctional heparinized polyamide membrane embedded with graphene quantum dots (GQDs) and hyperbranched polyethyleneimine (HPEI) is engineered for efficient bilirubin removal via a one‐step anticoagulation–adsorption process. The membrane demonstrates enhanced hemocompatibility, prolonged clotting times, and high bilirubin adsorption capacity ...
Abdur Rehman Mushtaq Ahmad +6 more
wiley +1 more source
Scientific ReportsIn order to alleviate the problem of tense mining succession in coal mines, this study starts from the perspective of rapid roadway excavation roadway support efficiency, and researches on the mechanism of anchored drilling drilling for drilling and rock
Xiao-He Wang, Zhi-Qiang Zhao, Wu Jing
doaj +1 more source
Shock and Vibration, 2020 Using a self-designed hydraulic impact drilling test-bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial ...
Zhi Liu +4 more
doaj +1 more source
Anti‐Slip Material‐Based Strategies and Approaches
Advanced Materials Technologies, EarlyView.This review highlights the principle mechanisms of slipping at the microscale, linking contact mechanics with a friction behavior model for surface interfaces. Main strategies to develop anti‐slip properties to the surfaces are discussed alongside standardized testing approaches.
Sogand Abbaspoor‐Zanjani +3 more
wiley +1 more source
Mechanism of drilling rate improvement using high-pressure liquid nitrogen jet
Petroleum Exploration and Development, 2019 To address the high rock strength and low drilling rate issues in deep oil/gas and geothermal exploitation, we performed mechanical property tests on three kinds of rock samples (granite, shale and sandstone) subjected to liquid nitrogen (LN2) cooling ...
Zhongwei HUANG +4 more
doaj +1 more source
Drilling fluid for drilling permafrost rocks
Bulletin of the Tomsk Polytechnic University Geo Assets EngineeringRelevance. The article provides an overview of the problem of drilling wells for oil and gas in conditions of permafrost. When constructing wells for various purposes in conditions of permafrost rocks, special requirements are imposed on the selection of the optimal drilling fluid.
Alexander Ya. Tretyak +2 more
openaire +2 more sources
Acoustic and physiological effects of the surroundings in rock cutting process [PDF]
, 2010 A noise effect arising in the rock cutting process is gaining a large attention as to the identification and optimization of the cuttingprocess. The sense experience acquired during the experiments in the process of rotary rock drilling related to the ...
František Krepelka +2 more
core
International Journal of Heat and Technology, 2018 Received: 5 April 2018 Accepted: 29 November 2018 Heat generated during rock drilling, due to friction at the bit-rock interface. Due to which temperature increases, which can influence the thermal stress and subsequent rock failure.
V. Shankar, B. M. Kunar, C. Murthy
semanticscholar +1 more source
Grip and Grasp: Lizard Claw Inspired Robotic Manipulators
Advanced Robotics Research, EarlyView.Our study identifies the most effective lizard claw shape for use as an end effector in a bioinspired robotic manipulator. By examining key geometric features and combining them into comparative indices, the Crotaphytus collaris claw is found to be the best fit.
Hyeon Lee +4 more
wiley +1 more source