Results 31 to 40 of about 392 (235)

Optimization of the Cost Function in the Drilling of Oil Well Network by Balas Algorithm [PDF]

Iranian Journal of Oil & Gas Science and Technology, 2014
The most costly operation in the oil exploration is the well network drilling. One of the most effective ways to reduce the cost of drilling networks is decreasing the number of the required wells by selecting the optimum situation of the rig placement ...
Bijan Maleki, Kamil Ahmadi, Abdolazim Jafari   +2 more
doaj   +1 more source

Mine-used mud pulse wireless measurement while drilling device and its applicatio

Gong-kuang zidonghua, 2019
For problems of wired while drilling device (MWD) which used central cable drilling rig as signal transmission channel such as complex drilling rig structure, limited mechanical behavior, poor anti-interference performance and so on, a mine-used mud ...
FANG Jun, GU Shuancheng, SHI Zhijun, LI Quanxin   +3 more
doaj   +1 more source

Application of long-distance directional drilling gas drainage technology inQinglong Coal Mine

Gong-kuang zidonghua, 2020
The coal mines in Guizhou Province have complex geological structures, high gas content, and soft coal seams, making gas management difficult. In order to improve gas management level in the area, at the range of 5-205 m forward from Y3 point of the ...
XUE Haiteng, LI Xijian, LIANG Daofu, CHEN Liuyu, MA Shengxiang   +4 more
doaj   +1 more source

Application of Ultra-deep Directional Drilling Technology in the Investigation of Sichuan—Tibet Railway Tunnel

工程科学与技术, 2022
In view of the large terrain elevation difference along the Sichuan—Tibet railway, the steep topography of the long and large buried depth tunnel project, extremely poor traffic conditions, and the inability to implement vertical deep hole exploration ...
Zhengxuan XU, Jianguo LIU, Jinsheng WU, Tao FENG, Minghao CHEN, Yandong WANG, Dong YUAN   +6 more
doaj  

ZDY2-300LM Full Hydraulic Drilling Rig with Double Working Arms

Meikuang Anquan, 2020
Aiming at the rapid and precise construction requirements for a large number of directional pre-borehole of roof cutting and pressure relief in coal mines, ZDY2-300LM full hydraulic drilling rig with double working arms is developed by means of variable
SHAO Junjie, ZHANG Ning
doaj   +1 more source

The integrated drainage technique of directional high-level borehole of super large diameter on roof replacing roof extraction roadway: A case study of the underground Zhaozhuang Coal Mine

Energy Reports, 2020
To maintain the high-efficiency production of fully mechanized working face under the condition of highly mechanized mining and guarantee the security operations during mining process at high gassy outburst-prone mines, in most cases, the gas control ...
Hong Li, Yanwei Liu, Wei Wang, Mingju Liu, Jinkui Ma, Xiaomin Guo, Huaiguang Guo   +6 more
doaj   +1 more source

BILSTM-Based Deep Neural Network for Rock-Mass Classification Prediction Using Depth-Sequence MWD Data: A Case Study of a Tunnel in Yunnan, China

Applied Sciences, 2023
Measurement while drilling (MWD) data reflect the drilling rig–rock mass interaction; they are crucial for accurately classifying the rock mass ahead of the tunnel face.
Xu Cheng, Hua Tang, Zhenjun Wu, Dongcai Liang, Yachen Xie   +4 more
doaj   +1 more source

Progress in research and applications of trenchless horizontal directional drilling equipment and technology in China

工程科学学报, 2022
Horizontal directional drilling (HDD) technology is widely used in the construction and maintenance of municipal lifeline projects, the laying of long-distance oil and gas pipelines, and directional survey of mountains.
Ping-he SUN, Wei-sheng LIU, Han-han YANG, Bang-di WEI, Yu-hong-ye XIA   +4 more
doaj   +1 more source

Designed Lewis Acid–Base Passivation for High Performance Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
ABSTRACT Silicon's high cost and long energy payback time remain major barriers to the global expansion of solar power. In contrast, metal–halide perovskites offer abundant, solution‐processable absorbers, and have achieved efficiencies of 25%–30%, positioning them as strong competitors to silicon.
Afna Manaf, Hiba Shahulhameed, Bhabani Sankar Swain, Shengzhong (Frank) Liu, Adel Najar   +4 more
wiley   +1 more source

Natural Biomaterials for Osteochondral Repair: From Source to Strategy

Advanced Healthcare Materials, EarlyView.
Biological origin‐guided overview of natural biomaterials and therapeutic strategies for osteochondral tissue engineering. The circular diagram categorizes representative materials and strategies into plant/algae‐derived, microbial‐derived, animal‐derived, and human‐derived sources, centered on an osteochondral defect repair model.
Hengyu Liu, Hanyang Zhang, Wenbo Yang, Hao Chen, Jincheng Wang, Fei Chang   +5 more
wiley   +1 more source