Results 131 to 140 of about 5,423 (259)

Flow Characteristics and Response Surface Methodology‐Based Pressure‐Loss Prediction Models for the Reverse Circulation Converter in Double‐Wall Drill Pipes

Energy Science &Engineering, EarlyView.
Flow characteristics and pressure loss mechanisms of a reverse circulation converter in dual‐wall drill pipes are systematically investigated using CFD and response surface methodology. The results reveal the dominant role of inertial dissipation and provide a predictive framework for optimizing converter design and operational parameters. ABSTRACT The
Mingming Geng, Hui Zhang, Junpeng Li, Baokang Wu, Geng Zhang, Xinrui Wang, Jintao An, Long Chen, Yiming Ma   +8 more
wiley   +1 more source

A whole rock geochemical dataset for magmatic rocks drilled on the mid-Norwegian margin. [PDF]

Sci Data
Tegner C, Guo P, Chatterjee S, Lambart S, Jones MT, Planke S, Svensen HH, Neumann ER, Lesher CE, Cashman K, Takahashi T, Cunningham EH, Morris AM, Stokke EW, Millett JM, Mohn GTF, Longman J, Berndt C, Alvarez Zarikian CA, Betlem P, Ferré EC, Filina IY, Frieling J, Harper DT, Scherer RP, Varela N, Xu W.   +26 more
europepmc   +1 more source

Mechanisms of Roadway Instability and Coupled Control Technology for Working Face Passing Through Fault Zones

Energy Science &Engineering, EarlyView.
This study mainly explores the instability characteristics of roadways near faults in the working face. Taking the 51104 transportation roadway of the 51104 working face in Shengxin Coal Mine as the main research object, through theoretical analysis, borehole inspection, numerical simulation and on‐site mine pressure observation, the instability ...
Shuaifeng Yin, Yitao Yan, En Wang, Xubo Zhao, Kanglei Han   +4 more
wiley   +1 more source

Melt flow control on lithological and geochemical heterogeneity of the oceanic upper mantle. [PDF]

Natl Sci Rev
Rui HC, Doucet LS, Lissenberg CJ, Lian DY, Li J, Cai PJ, Lai SM, Zhu JX, He HP, Yang JS.   +9 more
europepmc   +1 more source

Research on Crack Propagation and Stress Propagation in Coal‐Rock Combinations Under Different In Situ Stresses Subjected to Blasting Loads

Energy Science &Engineering, EarlyView.
A stress wave propagation model for coal‐rock combinations under in situ stress was established. Taking a coal mine in Huainan, China as the engineering background, isotropic and anisotropic numerical models were constructed. Field engineering practices were carried out to verify the reliability of the conclusions.
Jianyu Zhang, Guangming Chen, Meiyao Li, Xinyu Wang, Yuting Liu, Renjie Cui, Yixin Gong   +6 more
wiley   +1 more source

Task allocation method for anchoring robot with multiple drilling units and multiple tasks in coal mine roadways. [PDF]

Sci Rep
Ma K, Ma H, Wang C, Sun S, Guo Y, Wang P, Nie Z, Zhang Y, Su H, Wu X.   +9 more
europepmc   +1 more source

Multiphysics Coupled Response of Stress and Seepage in Coal Under Borehole Disturbance and Optimization of Borehole Parameters

Energy Science &Engineering, EarlyView.
One‐way FLAC3D‐COMSOL coupled modeling and field validation show that a 150 mm borehole radius with 5 m spacing provides the best coordination of plastic‐zone expansion, stress relief, permeability enhancement, and gas‐pressure attenuation, increasing the pure gas drainage rate by 35.4%. ABSTRACT To rationally determine the borehole radius and borehole
Yewu Bi, Yichen Li, Yangyang Guo, Yikai Zhang, Jiazhi Sun, Kangnan Li, Yongpeng Fan, Qixian Li   +7 more
wiley   +1 more source

Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof. [PDF]

Sci Rep
Wang R, Zhang WG, Wang HS, Yu ZJ, Zhang Q.   +4 more
europepmc   +1 more source

Evaluation of Drillability of the Mahu Conglomerate Formation in Xinjiang, China

Energy Science &Engineering, EarlyView.
This graphical abstract illustrates the workflow for developing an optimized prediction model using measurement while drilling (MWD) data. A total of 90 MWD cases are divided into a training set (80%) and a test set (20%). Four logging‐while‐drilling parameters—compensation density, acoustic travel time, resistivity, and neutron porosity—are selected ...
Yun Xia, Wan Zhu, Rui Chen, Hui Zhang, Boyuan Yang, Kunhong Lv, Baokang Wu, Xinrui Wang, Hu Wu   +8 more
wiley   +1 more source

Rotary cutting tests and rock-breaking characteristics of triple-ridged PDC cutters in tight hard sandstones from Xujiahe Formation in Sichuan Basin in China. [PDF]

Sci Rep
He W, Li X, Zhang Z, Shi H, Chen H, Ma Q, Huang Z, Xiong C, Dong J, Li Y.   +9 more
europepmc   +1 more source