Results 51 to 60 of about 6,445 (232)

Gas Diffusion Coefficient in Tight Sandstones: An Experimental Approach Under Various Controlling Factors

Geofluids, Volume 2026, Issue 1, 2026.
This study investigates the natural gas diffusion coefficients in tight sandstones, emphasizing the Sulige area′s geological conditions. Through experimental measurements and the simulation of natural gas diffusion processes, we explore the impact of various geological factors—including temperature, pressure, porosity, permeability, pore throat radius,
Zhongying Zhao, Shan Lu, Lijun Zhang, Shouxu Pan, Tao Chen   +4 more
wiley   +1 more source

Experimental Study on Multiscale Evolution Mechanism of Coalbed Reservoir Properties in “Three‐Low” CBM Reservoirs Modified by Chlorine Dioxide

Geofluids, Volume 2026, Issue 1, 2026.
Aiming at the “three‐low” challenges (low permeability, low gas saturation, and low critical desorption‐to‐storage ratio [CDSR]) of Chinese coalbed methane (CBM) reservoir materials, this study adopted chlorine dioxide (ClO2) chemical modification on long‐flame, coking, and anthracite coal materials.
Chaowen Hu, Ruifeng Huang, Huifeng Wang, Bo Pan, Xiaojie Yang, Yichao Li, Fulong Sun, Umberta Tinivella   +7 more
wiley   +1 more source

Physical Simulation and Law of Interlayer Interference in Multi-Layer Combined Production of Gas Reservoirs with Pressure Difference

Energies
To address interlayer interference during multi-layer commingled production in gas reservoirs with pressure differences, this study investigates the low-permeability gas reservoir in the central Linxing area of the Ordos Basin.
Yu Su, Bing Zhang, Honggang Mi, Chao Wei, Bo Wang, Le Sun, Tianyu Fu, Chen Wang   +7 more
doaj   +1 more source

Analysis of Gas Migration Characteristics and Controlling Factors in Nanopores of Deep Coal Seams

Geofluids, Volume 2026, Issue 1, 2026.
Nanopores of various scales and morphologies in coal are important spaces for gas storage and migration. To deeply analyse the initial gas migration scale and characteristics in coal matrix micropores, this paper constructs an apparent permeability model describing the gas migration scale based on the gas transport mechanism, and analyses the ...
Ji Xiaofeng, Cao Jinyao, Song Dangyu, Jian Kuo, Li Quanzhong, Pramita Mishra   +5 more
wiley   +1 more source

Optimization and application of sand bailing technology for coalbed methane horizontal wells

Meitian dizhi yu kantan
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells.
Fei ZHANG, Yibing WANG, Lu CHENG, Wenbo MEI, Qi YANG, Wenjie SHEN, Chao CAO, Peng LAI, Zhengkai LIAO, Bao’an XIAN, Yansen BI   +10 more
doaj   +1 more source

Methane migration characteristics of the Pocahontas No. 3 coalbed [PDF]

"Methane-flow and pressure data taken from a mine in the Pocahontas No. 3 Coalbed are compared with flow rates from lump coal obtained in laboratory experiments.

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Legal Considerations in the Development of Coalbed Methane

, 2001
This article is premised on the fact that the development of coalbed methane has only recently become commercially viable. The author defines coalbed methane and then considers various legal definition issues pertaining to its development.
Laffin, Michael J.
core   +1 more source

The disaster law and control measures of high-stress tunnels in fault areas: a case study

Scientific Reports
In recent years, the frequent occurrence of dynamic disasters in tunnels with high stress in fault areas has greatly threatened engineering safety. The typical case – a tunnel influenced by fault slip on is taken as a research object.
Wenjie Li, Mingwei Yao, Zhengkai Liao, Jinbiao Wu, Nenghui Ma, Jingyi Su, Chenchuan Mei, Wenzhe Wang   +7 more
doaj   +1 more source

Uncertainty Analysis Method for Rib Force Vector Control of Coiled Tubing Drilling Orientor

Shiyou jixie
In the process of coiled tubing （CT） directional drilling， the downhole parameters have some uncertainties. To more accurately control the wellbore trajectory to advance along the planned course， an uncertainty analysis method for rib force vector ...
Wang Wei, Zhuo Ran, Miao Qiang, Wu Jianjun, Li Shichao, Chen Gang, Li Meng   +6 more
doaj   +1 more source

The composition of coalbed gas [PDF]

"Samples of gas were obtained directly from the coalbed during drilling of horizontal and vertical boreholes in six different formations. The samples were analyzed by gas chromatography for C1 to C5 hydrocarbons and for 02, N2, H2, He, and CO2.

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