Abundant pore space in coal is not only the place for accumulation of coalbed methane (CBM), but also tunnel gas migration. In this study, five sets samples before and after second coalification were selected from eastern margin Ordos Basin to simulate supercritical CO 2 (Sc-CO ) extraction equipment. The evolutions structure porosity tested by mercury intrusion porosimetry nuclear magnetic res...

Abstract Staged multicluster fracturing (SMCF) is crucial for the low‐permeability coalbed methane (CBM) reservoirs development. To reveal fracture propagation mechanism and characteristics in SMCF select appropriate hydraulic parameters, this study considers CBM exploitation Shizhuang block, Qinshui Basin China as engineering background. Then, XSite software based on discrete lattice theory sy...

To investigate complex fracturing and the influencing factors of simultaneous fracture propagation in horizontal wells, a three-cluster model that is controlled by surface displacement parameters established. When performing multistage on reservoirs with relatively high development degree natural fractures, staged multicluster wells one commonly used technical methods for volume fracturing. Two...

The presence of methane in coal mines is one of the major problems in underground coal mines. Every year, in underground coal mines, a lot of casualties due to outbursts and explosions of methane gas is occurring. Existence of this gas in the mines not only creates a difficult and dangerous situation for work but also makes it more expensive. The release of this gas to the air causes a further ...

In an effort to increase productivity, many longwall mining operations in the U.S. have continually increased face lengths. Unfortunately, the mining of larger panels may increase methane emissions. The National Institute for Occupational Safety and Health (NIOSH) conducted a mine safety research study to characterize and quantify the methane emissions resulting from increasing face lengths in ...

Geological discontinues in the coalbed, such as faults, sandstone channels, permeability facies, lithotype changes, and large scale partings in the coal seam, can cause intermittent production problems or produce unexpected amounts of water or gas from degasification boreholes. These discontinuities not only can impact methane emissions into the mine workings, especially if they hinder proper a...

The quantitative identification of water sources is an important prerequisite for objectively evaluating the degree aquifer interference and predicting production potential coalbed methane (CBM) wells. However, this issue has not been solved yet, are far from being completely understood. Stable isotopes carriers source information, which can be used to identify CBM Taking Zhijin block in Wester...

The British Columbia Geological Survey Branch and the Geological Survey of Canada have initiated ajoint project to assess the coalbed-methane potential of coal deposits in British Columbia. This project entails participation with private industry to obtain fresh coal samples for desorption from exploration projects throughout the province. Samples are collected from the drill site and undergo a...

The energy sector is in the spotlight today for its contribution to global warming and dependence on geopolitics. Even though many countries have reduced their use of coal, COVID-19 crisis, drop temperatures Central Asia, war between Russia Ukraine shown that coal continues play an important role this today. As long as we continue depend energetically it necessary create basis successful extrac...