Results 11 to 20 of about 141,433 (299)
Energy Exploration and ExploitationTo expedite drilling operations in hard rock of coal mines, a new type of impact-shear drill bit was developed, and its mechanism of speed-up and efficiency increase was studied. The RHT constitutive model was used to describe the structural behavior of rock, and the rock-breaking simulation model of full-size bit was established.
Pei Ju
exaly +4 more sources
Influences of Microwave Irradiation on Rock-Breaking Efficiency of a Reduced-Scale TBM Cutter [PDF]
Applied Sciences (Switzerland), 2023 To explore the influences of microwave irradiation on the rock-breaking efficiency of tunnel boring machine (TBM) cutters, a multimode cavity with a microwave power of 2100 W was used to conduct microwave irradiation tests on Chifeng basalt for different durations.
Gaoming Lu
exaly +4 more sources
The effects of process parameters on the rock-breaking efficiency of multi-nozzle jet
Journal of Petroleum Science and Engineering, 2021 Abstract This paper examines the effect of multi-nozzle bit on sandstone specimens by means of numerical simulation and experiment, and the rationality is verified. Numerically, the effects of jets with different diameters and angles on rock were simulated by using LS-DYNA, and the rock-breaking shapes of jets with different angles are analyzed ...
Lipeng He, Yanbao Liu, Yanqing Wu
exaly +3 more sources
Analysis of Rock-Breaking Load Characteristics and Efficiency Optimization of Conical Cutterhead Hobs in Urban Hard-Rock SBM [PDF]
EngTo investigate the load characteristics and rock-breaking efficiency of the hobs on the conical cutterhead, a theoretical model of the hob’s rock-breaking load was established based on the plastic-brittle characteristics of rock, with a verification ...
Geqiang Li +5 more
doaj +3 more sources
Natural Gas Industry BTo master changes in rock mechanical properties and the impact of high temperature on rock-breaking efficiency, the rock mechanical properties of granite, limestone, and sandstone under different temperatures and single-tooth static-pressure experiments were studied.
Dongdong Song, Heyi Yuan
exaly +4 more sources
Improving the operational efficiency of drilling rock-breaking tools [PDF]
E3S Web of Conferences, 2023 Improving the quality and volume of drilling is the main condition for advancing the growth of reserves of raw materials of the national economy and industry. Rock-breaking tools are the main and busiest part of drilling equipment. Most of the operational productivity of drilling equipment depends on the operation of a rock-breaking tool, the ...
Rustam Juraev +2 more
openalex +3 more sources
The Influence Mechanism of Conical Pick Wear on Rock Breaking Efficiency Based on Indentation Tests [PDF]
EngWith the deepening of mineral resource exploitation, conical picks are subjected to severe wear under high-stress and high-friction conditions, which has become a critical factor governing rock-breaking efficiency.
Yunfei Xia +3 more
doaj +3 more sources
Study on rock breaking efficiency of special shaped cutters
IOP Conference Series: Earth and Environmental Science, 2022 Abstract The optimization of cutter shape has become one of the main innovation direction of PDC bit technology. At present, both domestic and foreign bit manufacturers have put forward various special shaped cutters to improve rock breaking efficiency.
Peng Qi +7 more
openalex +2 more sources
A Method for Evaluating the Rock Breaking Efficiency of Cutters and Optimizing the PDC Cutter Profile—A Study of Igneous Rock Formations in Shunbei Oilfield [PDF]
Energies, 2022 The Permian igneous rock in Shunbei Oilfield exhibits high rock strength, which results in a low rate of penetration (ROP) and shortens the cutter’s service life. It is necessary to analyze and evaluate the rock breaking effect of cutters. However, at this stage, the evaluation of the rock breaking effect has been limited to comparing the sizes of the ...
Zhuoxin Dong +6 more
openalex +3 more sources
Simulation study of rock-breaking performance of TBM cone-shape cutterhead under different tunneling parameters in spiral tunnel [PDF]
Science ProgressCompared with plane cutterhead, the cone-shape cutterhead has better rock-breaking performance with a free surface during the rock-breaking process. Tunneling parameters of cone-shaped cutterhead have great influence on the rock-breaking efficiency and ...
Laikuang Lin +7 more
doaj +2 more sources