Results 21 to 30 of about 1,297 (234)

Application of Reaming Drill Bit in Horizontal Directional Well

Meikuang Anquan, 2020
The reaming drill bit wrapped with mud in long-distance horizontal directional well will lead to drilling time delay and trajectory deviation from the original wellbore.
LI Peng, MO Haitao, ZHANG Qiang, LI Zijian
doaj   +1 more source

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

Low speed grinding and hang sidetracking branch technology for near horizontal directional hole in coal mine

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

Predicting Tunnel Groundwater Inflow by Geological Investigation Using Horizontal Directional Drilling Technology

Advances in Civil Engineering, 2022
To improve the prediction accuracy of tunnel excavation groundwater inflow, a prediction method based on a horizontal directional drilling geological survey is proposed.
Xialin Liu
doaj   +1 more source

Development of a new ratchet type two-stage positioning drill internal cutter and its application in near horizontal directional hole

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, YAO Ningping, DOU Xuqian, ZHANG Jinbao   +3 more
doaj   +1 more source

Research and application of near-horizontal directional coring technology and supporting drilling tools

Meikuang Anquan
In order to solve the technical problems of accurate and fine geological exploration of mines and preliminary exploration of infrastructure projects, based on the deflection mechanism of rope coring straightening drilling trajectory, a combination of ...
Zujie ZOU
doaj   +1 more source

Introducing Bentonite into the Environment in the Construction Stage of Linear Underground Investment Using the HDD Method

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, Maria Hełdak, Jakub Szczepański   +2 more
doaj   +1 more source

Injectable Dual‐Network Hydrogel System for Osteochondral Repair Combining Immunomodulation, Mechanical Adaptability, and Enhanced Tissue Integration

Advanced Functional Materials, EarlyView.
A UV‐triggered injectable dual‐network hydrogel is reported as the first application of bletilla striata polysaccharide (BSP) in osteochondral repair. By integrating methacrylamide‐modified BSP and nitrobenzaldehyde‐functionalized hyaluronic acid, the system achieves immunomodulation, mechanical reinforcement, and dynamic tissue adhesion, thereby ...
Jiaming Cui, Feifei Zhou, Yuan Luo, Tao Ouyang, Huiwu Zhang, Songmiao Cheng, Qiang Li, Xu Jiang, Yingying Yu, Yicheng Wang, Hong Ming   +10 more
wiley   +1 more source

Optimization of Hole Cleaning In Iraqi Directional Oil Wells

Journal of Engineering, 2016
Efficient cuttings transport and hole cleaning are very important factors for obtaining an effective drilling operation. In an inclined and horizontal drilling, hole cleaning issue is a common and complex problem.
Ayad A. Al-Haleem Abd Al-Razzaq, Abdul-Aali Dabbaj, Firas Mohammed Hadi   +2 more
doaj   +2 more sources

Harnessing the Orientation of Columnar Discotic Liquid Crystals for Narrowband Blue Emission with Enhanced Out‐Coupling Efficiency Toward Improvement of SP‐OLEDs Performance

Advanced Functional Materials, EarlyView.
Solution‐processed OLEDs containing discotic liquid‐crystalline MR‐TADF emitters are reported. Supramolecular self‐assembly induces homeotropic columnar alignment, enforcing preferential horizontal orientation of the emitter transition dipole moment in spin‐coated films, which leads to an enhancement in the device light outcoupling efficiency while ...
Joydip De, Abhishek Kumar Gupta, Džiugas Litvinas, Francisco Tenopala‐Carmona, Matthias Lehmann, Malte C. Gather, Eli Zysman‐Colman   +6 more
wiley   +1 more source