Coalbed Methane (CBM) is an unconventional form of natural gas which self-generated and self-stored in coal seams. In order to realize the effective exploitation CBM Zhengzhuang block, microstructure, wettability, permeability, rock mechanics in-situ stress were studied this research. It found that high rank anthracite characterized by vitrinite content low inorganic mineral content, abundant C...

Uncertainties of CO2 injection-sequestration in a CBM is driven by the complex process of gas desorptioncontrolled mechanism attributed to the natural characteristics of CBM and to the impact of the wells engaged in the reservoir. This work presents the reservoir characterization and simulation process focused on natural gas production and subsequent CO2 injection into an unmineable coal seam i...

This paper presents results of a simulation study designed to evaluate the applicability of Arps' [1945] decline curve methodology for assessing reserves in coalbed methane reservoirs. We simulated various coal properties and well/operational conditions to determine their impact on the production decline behavior as quantified by the Arps decline curve exponent, b. We then evaluated the simulat...

Although hydraulic fracturing technology has been comprehensively investigated, few scholars have studied the influence of on effect coalbed methane (CBM) extraction, and considered interaction between water CBM in research process, which is not conducive to guiding engineering design wells. In this work, a hydraulic-mechanical-thermal coupled model for extraction well established; it combines ...

The phenomenon of coalbed-methane synclinal accumulation in the Qinshui Basin has been widely reported, but it mainly observed core block Syncline. questions arise: does this exist wing Syncline and, if so, what is mechanism behind it? Further study required to answer these questions. This paper focuses on South Anze No. 3 coal seam as an example. It conducts a systematic sorting geological cha...

The occurrence and migration of coalbed methane (CBM) is inseparably associated with the pore structure within coal seams. Three Permian Longtan Formation tectonic samples (QL, XL, XT) from Guizhou Province were studied to determine size distribution characteristics, as well factors that influence adsorption. Adsorption test results show all generally have “ink bottle”-type pores, large capacit...

The theory of coalbed methane distribution controlled by tectonism is a hot issue in the field geofluid-geotectonic interaction research. Taking geological structure scale range 1302 working face Guojiahe wellfield Yonglong mining area as background, this paper focuses on basic research problem influence control coal reservoir gas content and uses THM coupling model to analyze change characteri...

Cleaning out the pulverized coal deposited at bottom of a coalbed methane (CBM) well is key to achieving continuous CBM drainage and prolonging workover period. In this study, Fluent used in conjunction with standard k-? model Eulerian-Eulerian simulate analyse jet erosion particles. The depth width stable pit that formed by jet-impacting under different conditions are determined provide theore...

The area studied covers unmined Pennsylvanian Ćwiklice and Dankowice coal deposits located in the southern part of Upper Silesian Coal Basin, Poland. geological structure clearly affects current distribution methane. content methane is lower seams lying within porous permeable sandstones (Łaziska sandstones), whereas it higher that occur sequences (Mudstone Series) where impermeable shales muds...

Understanding the effect of coalification on diffusion methane in middle-high rank coals (MHRC) is fundamental for optimizing coalbed (CBM) drainage strategies. Safe coal mining relies critically this approach. Hence, CH4 adsorption/desorption experiments and a new model were used to study behavior five different metamorphic degree from China. The results indicate that, as vitrinite reflectance...