Results 11 to 20 of about 141,733 (202)
Frontiers in Earth Science, 2021 Insight into the difference between the mechanical properties of rocks at low and in situ deep reservoir temperatures is vital for achieving a better understanding of fracking technologies with supercritical CO2 and liquid nitrogen. To address this issue,
R. He +7 more
doaj +1 more source
Deep ice-core drilling to 800 m at Dome A in East Antarctica
Annals of Glaciology, 2021 A deep ice core was drilled at Dome A, Antarctic Plateau, East Antarctica, which started with the installation of a casing in January 2012 and reached 800.8 m in January 2017. To date, a total of 337 successful ice-core drilling runs have been conducted,
Zhengyi Hu +13 more
doaj +1 more source
Sensor-Integrated Tool for Self-Optimizing Single-Lip Deep Hole Drilling
International Journal of Automation Technology, 2022 Single-lip deep-hole drilling (SLD) is characterized by high surface quality and compressive residual stress in the subsurface of the drill hole. These properties depend significantly on the thermo-mechanical conditions in the machining process.
R. Wegert +4 more
semanticscholar +1 more source
Meikuang Anquan, 2020 Aiming at the problems such as low efficiency and depth limit of directional drilling caused by the support pressure of drilling tools in the directional drilling of ultra-deep hole in underground coal mine, learning from the twist drilling technology ...
JIANG Lei, XU Chao, LI Quanxin, WANG Xian
doaj +1 more source
Key technology and application of surface life support hole demonstration project in Meihuajing Mine
Meikuang Anquan, 2022 In order to solve the problems of low drilling efficiency and poor target-hitting accuracy of ground life support hole, Meihua Mine was selected as the test site of rapid and accurate drilling technology project, through the analysis of geological ...
KANG Yuguo, ZHANG Biao, ZHANG Ming
doaj +1 more source
A multiscale evaluation of the surface integrity in boring trepanning association deep hole drilling
International Journal of Machine Tools and Manufacture, 2017 Hf Zhan, Yuantong Gu, Arixin Bo
exaly +2 more sources
Applied Sciences, 2021 The performance of electrical discharge machining for drilling holes decreases with machining depth because the conventional flushing and electrode cannot completely eliminate debris particles from the machining area.
K. Jamkamon, P. Janmanee
semanticscholar +1 more source
Investigation into deep hole drilling of austenitic steel with advanced tool solutions
The International Journal of Advanced Manufacturing Technology, 2021 Deep hole drilling processes for high-alloyed materials are characterised by worn guide pads and chatter vibrations. In order to increase feed rates, process stability and bore quality in STS deep hole drilling, various investigations were carried out ...
N. Felinks +6 more
semanticscholar +1 more source
Study on dynamic characteristics of drill string in deep-water riserless drilling
Advances in Mechanical Engineering, 2023 The cost and security of ocean drilling are directly related to the efficient exploration and development of ocean resources. The riserless drilling system is usually adopted in the ocean drilling.
Fangfei Huang +4 more
doaj +1 more source
Migration Characteristics of Boring Mud in Roadway Floor Anchor Wire Hole and Test in Coal Mine
Advances in Civil Engineering, 2021 Given the difficulty in drilling the anchor holes in the roadway floor of the coal mine, the characteristics of slag movement in the process of positive and negative circulation drilling are analyzed.
Hui Zhang +5 more
doaj +1 more source