Results 181 to 190 of about 392 (235)

The entry retained along gob side with small coal pillar and its surrounding rock control: a case study. [PDF]

Sci Rep
Li L, Yang Y, Wu L, Zhang W, Yang W, Zhai Y.   +5 more
europepmc   +1 more source

Study on the Application of Comprehensive Gas Control Technology for Source-Separated Three-Dimensional Gas Extraction in Large Mining Faces. [PDF]

ACS Omega
Liu J, Wang Z, Wang Q, Zou S, Yang X.
europepmc   +1 more source

Key technologies of small multi azimuth directional drilling rig

2020 5th International Conference on Mechanical, Control and Computer Engineering (ICMCCE), 2020
Because of the problem that conventional directional drilling rigs are large in volume and small inclination angle of openings, which cannot meet the drilling requirements of narrow tunnels in small and medium coal mines, a small multi-directional directional drilling rig has been developed.
Baoyong Yan
exaly   +3 more sources

Design and analysis of stablizer of one-kilometer directional drilling rig for gas drainage

2011 International Conference on Consumer Electronics, Communications and Networks (CECNet), 2011
One-kilometer directional drilling rig is a head-type hydraulic rig, which can drill horizontal deep holes in coalseam with down-hole motor for gas drainage. To avoid the hole axis floating and the rig overturning, a stabilizer is designed for high stable ability in this paper. Stabilizer is subsequently modeled and simulated in four typical conditions
Jianming Zhang, Guiqin Liu
exaly   +3 more sources

Structural Modeling and Performance Analysis of Rotary Circuit in Directional Drilling Rig Based on Load Sensing Technology

International Journal of Wireless Information Networks, 2018
Aim at improving the energy saving and transmission efficiency of directional drilling rig, the load sensing technology and constant-pressure variable technique are adopted to enable the system to provide the required pressure and flow rate according to the load variation.
Jianwei Wang
exaly   +3 more sources

Drilling device and control system of double power head directional drilling rig in underground coal mine

Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021), 2022
Yafeng Yao, Ningping Yao, Cuicui SHA, Kun Li, Guangyu Peng   +4 more
exaly   +3 more sources

Autonomous Directional Drilling with a Miniature-Scale Research Rig

SPE Norway Subsurface Conference, 2022
Abstract Drillbotics is an international student competition hosted by SPE/DSATS. The 2020/2021 competition challenged student teams to design, build and implement a 1.5″ (3.8cm) hole size, fully autonomous directional drilling rig. The well path had to intersect multiple pre-set targets in a rock sample with up to 30-degree inclination ...
Magnus Steinstø, Gaute Hånsnar, Benedicte Gjersdal, А. Н. Павлов, Fred Florence   +4 more
openalex   +2 more sources

directional drilling rig

, 2014
exaly   +3 more sources

Directional Drilling Automation Using a Lab-Scale Drilling Rig: SPE University Competition

IADC/SPE International Drilling Conference and Exhibition, 2020
Abstract The use of drilling automation is accelerating, mostly in the area of rate of penetration (ROP) enhancement. Autonomous directional drilling is now a high focus area automating the drilling operations. The potential impact is immense as 93% of the active rigs in the US are drilling directional or horizontal wells.
Emmanuel Akita, Forrest Dyer, Savanna Drummond, Monica Elkins, Payton Duggan, Ramadan Ahmed, Fred Florence   +6 more
openalex   +2 more sources