Sorption processes can be used to study different characteristics of coal properties, such as gas content (coalbed methane potential of a deposit), gas diffusion, porosity, internal surface area, etc. Coal microstructure (porosity system) is relevant for gas flow behaviour in coal and, consequently, directly influences gas recovery from the coalbed. This paper addresses the determination of coa...

Quantifying three-dimensional spatial distributions of pores and material compositions in samples is a key materials characterization challenge, particularly in samples where compositions are distributed across a range of length scales, and where such compositions have similar X-ray absorption properties, such as in coal. Consequently, obtaining detailed information within sub-regions of a mult...

The gas/fluid flowing behavior and fluid distribution under capillary forces in porous media are essential for evaluating the pore-fracture characteristics of coal. Capillary force is crucial flow-back efficiency after hydraulic fracturing during enhanced coalbed methane (CBM) production. In this work, situ dynamic X-ray micro-computed tomography (X-ray ?-CT), field emission scanning electron m...

Microbially enhanced coalbed methane technology must be used to increase the methane content in mining and generate secondary biogenic gas. In this technology, the metabolic processes of methanogenic consortia are the basis for the production of biomethane from some of the organic compounds in coal. Thus, culture nutrition plays an important role in remediating the nutritional deficiency of a c...

In most mining areas of China, coal seams are characterized by low gas pressure, poor permeability, and high adsorption capacity, all which have brought considerable difficulties to seam coalbed methane (CBM) extraction. According the multiyear scientific research production practice is migrated in quantity only after body directly mined, surrounding rocks deform fracture under influence. Thus,...

The coalbed methane (CBM) resource in the southern Qinshui Basin, North China, is abundant. Proper understanding of geological control factors on CBM enrichment Anze Block Basin critical to design efficient development plan this area. Field and laboratory data including well logging, testing, hydraulic fracturing, groundwater chemical analysis were used evaluate characteristics hydrodynamic geo...

The parameters of gas-liquid two-phase flow bubbles in field coalbed methane (CBM) wells are of great significance for analyzing coalbed methane output, judging faults in CBM wells, and developing gas drainage and extraction processes, which stimulates an urgent need for detecting bubble parameters for CBM wells in the field. However, existing bubble detectors cannot meet the requirements of th...

This work studied the influence of effluent recirculation upon the kinetics of anaerobic degradation of dairy wastewater in the feedless phase of intermittent upflow anaerobic sludge bed (UASB) reactors. Several laboratory-scale tests were performed with different organic loads in closed circuit UASB reactors inoculated with adapted flocculent sludge. The data obtained were used for determinati...

In-situ stress is an important indicator for the preferential selection of coalbed methane (CBM) exploration dessert zones, and a key factor affecting production capacity wells. Coal reservoir permeability one parameters to evaluate recoverability modifiability reflects seepage coal reservoirs. In this study, in situ data were collected from multiple injection/fall-off tests parameter wells wes...