Results 181 to 190 of about 22,977 (217)

<i>Plastrum Testudinis</i> Extract Promotes Endogenous Bone Marrow Mesenchymal Stem Cell Migration in Osteoporotic Fracture Repair Partly by Activating the SDF-1/CXCR4 Axis. [PDF]

Stem Cells Int
Chen X, Zhuo H, Zhang P, Ma J, Liang G, Tan R, Gong Y, Wang Y, Qin W, Dai J, Zhong Z, Wang H, Lin R, Kuang Z, De L, Tang Y, Ding J, Wu Z, Yu X.   +18 more
europepmc   +1 more source

Assessment of Hammer Energy Measurement for the Standard Penetration Test (SPT) Using Pile Driving Analyzer and Kallpa Analyzer Devices in Peru. [PDF]

Sensors (Basel)
Ortiz C, Alva J, Oliden J, Huarcaya N, Riveros G, Raucana R.   +5 more
europepmc   +1 more source

Accuracy of Navigation and Robot-Assisted Systems for Dental Implant Placement: A Systematic Review. [PDF]

Dent J (Basel)
Pisla D, Bulbucan V, Hedesiu M, Vaida C, Pusca A, Mocan R, Tucan P, Dinu C, Pisla D.   +8 more
europepmc   +1 more source

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Study on Directional Drilling Coupling Dynamics Based on Drill String Rotary Controller

Journal of Computational and Nonlinear Dynamics, 2023
In the process of long horizontal directional well drilling, the contact between drill string and borehole wall leads to serious dragging pressure. Therefore, a Drill String Rotary Controller(DSC) for directional well is proposed, and the function test
Yang Yinglin, Tian Jialin
exaly   +2 more sources

Experimental and numerical study of drill string dynamics in gas drilling of horizontal wells

Journal of Natural Gas Science and Engineering, 2015
Zhanghua Lian, Tiejun Lin
exaly   +2 more sources

Drill string dynamics and experimental study of constant torque and stick-slip reduction drilling tool

Petroleum science and technology, 2022
Aiming at the problems of large torque fluctuation of drill bit and low weight-on-bit(WOB) transmission efficiency during the drilling process, a novel drilling tool generating constant torque and reducing stick-slip is proposed.
Jialin Tian, Lei Tang, Yinglin Yang, L. Dai, Changqing Xiong   +4 more
semanticscholar   +1 more source

The effect of negative pressure pulse on the drill string dynamics and its friction-reduction performance

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
When the exploration and development of oil and gas resources toward longer-distance and more complex conditions, drilling engineering are facing more difficulties, such as lower drilling efficiency, less WOB (weight on bit), and larger friction, which ...
Jialin Tian, Tongxu Ge, Zhichao Hu, Yi Yang   +3 more
semanticscholar   +1 more source

AI-Based Analysis of Formation Heterogeneity and Drill String Dynamics in Hole Deviation Management

International Conference on Circuit, Power and Computing Technologies
Effective hole deviation management is crucial for optimizing drilling operations, particularly in challenging geographic environments. This paper presents Deep Learning (DL) based DACRNET (Dynamically Adaptive Convolutional Regression Network) to ...
Dasari Appaji, A. Sandeep, J. Chandra, Obul Reddy, G. Rama, B. Krishnakanth   +5 more
semanticscholar   +1 more source

Transient prediction model for temperature in horizontal well drilling considering drill string and fluid dynamics

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects
Accurately predicting temperature distribution in horizontal wells is essential for controlling bottom-hole temperatures and improving drilling efficiency.
Mingjie Cai, Mingmin He, Hao Peng, Yuyao Li, Tingjun He   +4 more
semanticscholar   +1 more source