The Yangquan coalfield is one of the typical highly gassy mining areas in China. However, its coal seams are of lower permeability, which are not conductive to coalbed methane (CBM) drainage. In this study, based on the theory of the ground movement, we analyzed the principle of coal and CBM coextraction in the Yangquan coalfield, and established the technology system of coal and CBM coextracti...

In order to solve the problem of reciprocating motion in no beam supported mining machines, putting energy saving as a starting point in Coal Bed Methane (CBM) exploitation, this paper designs a completely non-circular gear automatic reversing vertical drainage machine based on the theory of non-circular gear transmission. In the field of CBM exploitation, the use of non-circular gears is an at...

Unmineable coal is an important resource because of its potential to produce coalbed methane (CBM). CBM has grown to supply approximately 10% of US natural gas production and is becoming important worldwide as an energy source [1]. Furthermore, when CO2 is injected, it has the potential to enhance the amount of methane produced (ECBM) and to geologically sequestrate CO2 as an adsorbed phase. Th...

Enhanced coal bed methane recovery (ECBM) consists in injecting carbon dioxide in coal bed methane reservoirs in order to facilitate the recovery of the methane. The injected carbon dioxide gets adsorbed at the surface of the coal pores, which causes the coal to swell. This swelling in confined conditions leads to a closure of the coal reservoir cleat system, which hinders further injection. In...

There has been increasing interest in the coalbed methane (CBM) potential in the coalfields of British Columbia and some of this interest has been directed at the Comox Basin on Vancouver Island. The CBM resource of the basin has been estimated by a number of authors using published coal data. Most recently by Ryan (2001) quotes a potential resource of 0.8 tcf. These estimates are indeed estima...

Coal bed methane (CBM) extraction has astounding effects on the global energy budget. Since earliest discoveries of CBM, this natural gas form witnessed ever-increasing demands from core sectors economy. CBM is an unconventional source occurring naturally within coal beds. The multiphase generation during evolution commences with microbial diagenesis sedimentary organic matter peatification, fo...

The interior of British Columbia contains a number of fault bounded Tertiary basins that contain coal (Figure 1). This paper brings together existing data that aids in assessing the coalbed methane (CBM) potential of the basins and presents new data on some of the basins. The CBM potential of the basins ranges from up to 1 tcf at Hat Creek to a few bcf at Coal River. In all cases the resources ...

Coalbed methane (CBM) or coalbed natural gas (CBNG) is an unconventional natural gas resource with large reserves in the United States (US) and worldwide. Production is limited by challenges in the management of large volumes of produced water. Due to salinity of CBM produced water, it is commonly reinjected into the subsurface for disposal. Utilization of this nontraditional water source is hi...

Methane adsorption properties of coal are essential for coalbed methane (CBM) extraction and clean energy utilization. However, the effect nanopores on CH4 in high volatile bituminous...

A series of molecular and geochemical studies were performed to study microbial, coal bed methane formation in the eastern Illinois Basin. Results suggest that organic matter is biodegraded to simple molecules, such as H(2) and CO(2), which fuel methanogenesis and the generation of large coal bed methane reserves. Small-subunit rRNA analysis of both the in situ microbial community and highly pu...