Results 31 to 40 of about 974,451 (233)
Construction and Application of Mathematical Model of Stable Fracture Development Zone of Roof
Geofluids, 2022 The fractured zone in the overlying strata of a coal mine goaf is vital for effective gas drainage. The development height of the fractured zone is lied on the “saddle type” theory and calculated by empirical formula, while the horizontal range is ...
Xinjian Li, Xiangjun Chen, Lin Wang
doaj +1 more source
Friction law of compound drilling along the coal seam with super-long directional drilling
, 2021 The internal friction is the main factor affecting the drilling rate and drilling efficiency in super-long directional drilling in coal mines. In order to meet the objective demand of gas drainage mode in big panels, the friction and its influence law in
Jun, FANG +5 more
core +1 more source
Applied Sciences, 2018 The study discusses the issue of introducing drilling fluid (bentonite) into the environment during the construction of linear underground investments, considering the example of the construction of the high-pressure gas pipeline, Czeszów— ...
Urszula Kwast-Kotlarek +2 more
doaj +1 more source
Meikuang Anquan, 2022 The branch hole is the key to ensure the long-distance drilling of directional hole along the target stratum, improve the coverage of directional drilling and accurately explore geological abnormal bodies.
FANG Jun
doaj +1 more source
Meikuang Anquan, 2022 With the increasing application of milling technology in near-horizontal directional drilling stuck/buried drilling accidents in coal mines, the probability of second stuck/buried drilling accidents with milling tools increases.
WEI Hongchao +3 more
doaj +1 more source
Pull-in force predictions for horizontal directional drilling
, 2010 Horizontal directional drilling is a ‘trenchless technology' that has been used successfully to install pipelines with minimal surface disruption. It has been developed to such an extent that pipelines 2·5 km long and with diameters approaching 2000 mm ...
M. A. Polak +3 more
core +2 more sources
Advanced Functional Materials, EarlyView.Nitride MXenes remain constrained by a persistent gap between computational prediction and experimental realization. This Review identifies the thermodynamic, kinetic, and chemical barriers limiting their synthesis, critically evaluates emerging fabrication routes, and proposes a multidimensional computational‐experimental framework to accelerate the ...
Naresh Varnakavi, Masoud Soroush
wiley +1 more source
, 2018 Schematic diagram of the field test configuration while in horizontal directional well drilling with hydro-hammer.
Jiang-fu He (5227361) +3 more
core +1 more source
Quality Control for Weathered Rock Directional Drilling Pilot Hole Construction [PDF]
, 2014 Directional Drilling Technology originated from the oil drilling industry, combining industrial and public utility construction technology, after the evolution of modern horizontal directional drilling technology, which is widely used in the construction
Youzhu, ZHANG +2 more
core +1 more source
Defect‐Mediated Inelastic Light Scattering by Infrared Phonons in Hexagonal Boron Nitride
Advanced Functional Materials, EarlyView.Optically active defects in hexagonal boron nitride enable inelastic stimulated light scattering mediated by infrared‐active phonons, relaxing conventional Raman selection rules. Defect engineering enhances the Stokes‐conversion process and activates both TO‐ and LO‐phonon scattering channels.
Prabhdeep Singh +4 more
wiley +1 more source