Results 21 to 30 of about 135 (92)

Magnetic Electric Detonator Coding Graded Perforation Firing Technology

Cejing jishu
In bridge plug multi-cluster perforation operations, using high resistance detonator in graded perforation poses a safety risk of accidental detonation. Magneto electric detonator have good resistance to environmental electricity.
YANG Bin, LU Caihao, SONG Ning, LIU Bing, ZHAO Li, XIAO Xiangyang   +5 more
doaj   +1 more source

Research of Dynamic Azimuth Gamma Instrument while Drilling for Mine [PDF]

E3S Web of Conferences, 2020
In view of the problems that the existing gamma logging instruments in coal mines can only carry out static fixed-point measurement and are not suitable for rotary drilling, this paper, based on the analysis of the characteristics of measurement while ...
Long Chen, Gang Chen
doaj   +1 more source

Current status and key factors for coalbed methane development with multibranched horizontal wells in the southern Qinshui basin of China

Energy Science &Engineering, Volume 7, Issue 5, Page 1572-1587, October 2019., 2019
After more than 20 years of exploration and development, by the end of 2017, China has drilled 17 800 CBM wells, including 16 219 production wells with an annual gas production of 49.59 × 108 m3. However, the average daily CBM production in China is only 838 m3/d per well, far lower than other countries.
Shida Chen, Dazhen Tang, Shu Tao, Yanhui Yang, Longwei Chen   +4 more
wiley   +1 more source

High Sulfur Resistance Gunless Through-Tubing Perforation Technology

Cejing jishu
To improve the perforation efficiency of through-tubing in integrated production strings for acidic gas fields and reduce complex failures, a high sulfur-resistant gunless through-tubing perforation technology is developed. A downhole system for plugging
LU Caihao, ZHAO Kailiang, SONG Ning, PENG Xin, ZHU Zhili, SHI Xingjian   +5 more
doaj   +1 more source

LightGEUnet: A Lightweight U‐Net for 3D Seismic Fault Detection

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Fault detection represents a crucial task in seismic interpretation, with significant implications for hydrocarbon exploration. Advancements in artificial intelligence have driven widespread adoption of machine learning techniques to tackle complex scientific and engineering problems.
Yuzhe Tang, Hongjun Wang, Liangjie Zhang, Yunpeng Shan   +3 more
wiley   +1 more source

Optimization Design Method and Application of Nitrogen Horizontal Well Drilling Technology in Coalbed Methane Reservoirs

Energy Science &Engineering, Volume 13, Issue 11, Page 5702-5712, November 2025.
Through the independent research and development of nitrogen drilling software, the calculation model of gas injection parameters and friction torque calculation model suitable for coalbed methane nitrogen drilling are established, and the calculation methods of construction parameters such as gas injection volume and injection pressure, friction ...
Hu Jiachen, Tan Zhanglong, Yang Fan, Hao Zhaobing, Yang Qi, Feng Lei, Wang Peng   +6 more
wiley   +1 more source

The Tectonic Responses in the Overriding Plate During the Tethyan Convergence and the Progressive Extrusion Process in Sundaland: Insights From the Wuliangshan Massif, SE Tibetan Plateau

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract The overriding plate commonly accumulates less strain than the subducted plate during continental collision. Analyzing plate interactions from the perspective of the overriding plate provides important insights into orogenic dynamics. In the southeastern Tibetan Plateau, the Wuliangshan massif, as a key region of the overriding plate, records ...
Qinying Wu, Wei Lin, Lingtong Meng, Yin Wang, Fei Liu, Yang Chu, Wei Wei, Michel Faure, Vuong Van Nguyen, Hoai Luong Thi Thu, Chao Song, Zhao Guo   +11 more
wiley   +1 more source

Two-dimensional NMR characterization of gas–water distribution in tight sandstone reservoirs: a case study from the Ordos Basin, China

Frontiers in Earth Science
Tight sandstone reservoirs exhibit low porosity, low permeability, significant heterogeneity, and complex gas-water distribution patterns, posing significant challenges for conventional logging methods in accurate gas reservoir identification. Incomplete
Ran Zhang, Ran Zhang, Xinyi Chen, Xinyi Chen, Xin Sun, Xin Sun, Xiang Ge, Xiang Ge, Huanfu Du, Huanfu Du, Mengmeng Yao, Mengmeng Yao   +11 more
doaj   +1 more source

Lateral heterogeneity of basin‐plain turbidites of the Cloridorme Formation, Quebec, Canada: Implications for horizontal well prediction

The Depositional Record, Volume 11, Issue 1, Page 22-43, February 2025.
Exceptional outcrop exposures of the Cloridorme Formation, Quebec, Canada, offer a rare opportunity to quantify the lateral continuity of event beds and elements of a basin‐plain depositional environment. Eighty‐two per cent of the mapped event beds are present across a 530 m outcrop transect parallel to depositional dip. However, even in this overall ‘
Zane Jobe, Chance Seckinger, Thomas Martin, Kaci Kus, Luke Pettinga   +4 more
wiley   +1 more source

Study on open‐hole extended‐reach limit in horizontal drilling with wavy wellbore trajectory

Energy Science &Engineering, Volume 12, Issue 3, Page 1124-1136, March 2024.
Drilling a series of wavy wellbore trajectories has emerged as a promising operation, offering significant advantages in enhancing reservoir contact. Extending the length of these wavy trajectories requires careful consideration in terms of safe drilling practices, as the pressure management associated with these intricate trajectories has been seldom ...
Hui Zhang, Yufei Chen, Wenxin Wu, Hui Zhang, Dexin Ma, Zongyu Lu   +5 more
wiley   +1 more source