Results 51 to 60 of about 961 (134)

Analysis of drilling and reaming technique of large diameter high directional hole and gas extraction effect

Meikuang Anquan
Aiming at the problems of low comprehensive efficiency and high treatment cost in the conventional treatment of mining pressure relief gas in “U” ventilation mining face, taking a mining face in Jincheng Mining Area, Shanxi Province as the research ...
Weifeng YANG, Jianlin LIU, Fei LIU, Jianguo ZHAO, Zhiwei CHU   +4 more
doaj   +1 more source

Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking

Scientific Reports
To reveal the velocity distribution law of a gas lift reverse circulation well washing flow field in drilling shaft sinking, a velocity mathematical model of well washing flow field is established.
Longhui Guo, Hua Cheng, Zhishu Yao, Chuanxin Rong, Jian Lin, Xiaoyun Wang   +5 more
doaj   +1 more source

Progress in the study of the basic properties and engineering applications of alkali residue

工程科学学报
Alkali residue is a byproduct of the ammonia-soda process used to produce soda, characterized by high production volume, low utilization efficiency, high moisture content, high porosity, and fine particle size.
Zhengcheng WANG, Songyu LIU, Yuanchen GUO, Jiwei SHEN, Haibo JIANG, Kai WU   +5 more
doaj   +1 more source

Optimizing coal water slurry concentration via synergistic coal blending and particle size distribution

Green Processing and Synthesis
This study explores strategies to enhance coal utilization efficiency, enable on-site coal conversion, transition thermal coal into raw coal, and improve the energy efficiency of coal water slurry (CWS) gasification.
Liu Ming, Li Hanxu
doaj   +1 more source

Normally closed blowout prevention system and method for underground drilling construction in coal mine

Meikuang Anquan
In view of the problems of gas overrun and coal and gas outburst accidents in the construction of underground gas extraction boreholes in coal mines, the problems existing in the traditional simple orifice device and the normally open automatic orifice ...
Gang ZHANG, Fugang XIAO
doaj   +1 more source

Structural design and analysis of water jet/ abrasive water jet composite self-propelled drilling device

Meitan kexue jishu
To address the difficulty in gas extraction from low-permeability coal seams, in view of the problems of poor drilling performance of water jet and weak rock-breaking and slag discharge capabilities of abrasive water jet, the design and analysis of a ...
Yan WANG, Jinlong SHI, Dongsu ZHANG, Xiyang ZHANG, Xinhao LIU, Hongyu ZHAO   +5 more
doaj   +1 more source

Self‐Circulating Mud's Lubrication Application on Overlength Pipe Jacking Construction

Engineering Reports
Pipe jacking technology is widely used in underground pipeline projects due to its minimal surface disruption and strong adaptability. This study focuses on the application of self‐circulating slurry and slag discharge technology in the ultra‐long ...
Tianguo Tang, Chengzhi Long, Weixue Xia, Mingjiu Yu   +3 more
doaj   +1 more source

Technology of cavity completion in surface cluster wells for assisting rock cross-cut coal uncovering in high outburst coal seam

Meitan kexue jishu
In view of the problems of high risk in rock cross-cut coal uncovering of deep outburst coal seam, and borehole blowout and low efficiency during underground drilling, based on numerical simulation and field experiments, the mechanism of reducing ...
Ting LIU, Cheng ZHAI, Xiaozhang TONG, Hexiang XU, Quanle ZOU, Baiquan LIN, Jizhao XU   +6 more
doaj   +1 more source

Current situation and development trend of mechanized shaft driving in frozen shaft

Meitan kexue jishu
In view of the energy occurrence structure of “rich coal, poor oil and little gas” in China, and the situation that coal will occupy the dominant position of energy consumption for a long time,The development history of frozen shaft mechanized drilling ...
Xiangsheng CHEN, Heng WANG, Zhaoyang SONG, Hanqing CHEN, Xi CHEN, Hang DING, Lei WANG   +6 more
doaj   +1 more source

A modular casing while drilling rig for large-diameter horizontal boreholes for underground rescue

Meitian dizhi yu kantan
ObjectiveOperations in a narrow space pose a challenge to rescue in the case of the collapse of mine roadways or tunnels. To address this challenge, this study developed a modular rescue casing while drilling (CwD) rig system for horizontal boreholes ...
Dong FAN, Xiaoyang NI, Shuyuan MU, Zujie ZOU, Guojun WEN, Yingping LI, Feifei LU   +6 more
doaj   +1 more source