Coal swelling in the presence of water as well as CO2 is a well-known phenomenon, and these may affect the permeability of coal. Quantifying swelling effects is becoming an important issue to verify the suitability of particular coal seams for CO2-enhanced coal bed methane recovery projects. In this report, coal swelling experiments using a visualization method in the CO2 supercritical conditio...

Coalbed methane (CBM) is a significant unconventional natural gas resource existing in matrix pores and fractures of coal seams cleaner energy compared to crude oil. To produce CBM, stimulation operations are required, given that the permeability generally too low. Hydraulic fracturing most widely used technology for reservoir stimulation; however, there few challenging issues associated with i...

The Baiyanghe block in Fukang, Xinjiang, China, is rich coalbed methane (CBM) resources, and several pilot experimental wells have yielded high production. Due to the dip angle (35–55°) of coal seam this area, lack understanding geological characteristics, physical properties coal, gas–water migration law lead immature development techniques poor overall benefits. We first conducted desorption ...

Sulfateand Fe(III)-reducing, and methanogenic prokaryotes (SRP, FRP, MGP) are key players in metabolic pathways involved in anaerobic biodegradation processes. Understanding the metabolic activity of these microbes in environments can enhance microbe-mediated processes such as oil spill bioremediation and methane biogas production. In this study, anaerobic microbial activities in Deepwater Hori...

Production of unconventional gas resources commonly requires the use of hydraulic fracturing and chemical production well additives. Concern exists for the use of chemical compounds in gas wells due to the risk of groundwater contamination. This study focuses on a proposed method of identifying groundwater contamination from gas production. The method focuses on the classification of naturally ...

Taking the standard size coal block samples defined by ISRM as research objects, both properties of methane diffusion of coal block under triaxial compressive stress and characteristic influences caused by methane pressure were systematically studied with thermo-fluid-solid coupling with triaxial servocontrolled seepage equipment of methane-containing coal. The result shows the methane diffusio...

The thermal flow reversal reactor (TFRR) and catalytic flow reversal reactor (CFRR) can utilize the ventilation air methane (VAM) from coal mines effectively. The initial cold feed flow mass distribution uniformity in the monolith oxidation bed, the critical part of both reactors, has a great influence on the stability of methane oxidation process and conversation rate. So the emphases are put ...

Precisely describing the formation and evolution rules of coal-rock fracturing crack have great value on reservoir fracturing improvement and highly efficient mining of coal bed methane well. In this paper, a non-linear dynamic method is used to study crack damage evolution behavior of coal-rock fracturing. Considering distribution characteristics of natural cracks in coal-rock, and based on da...

Multilateral wells have been increasingly used in recent years by different industries such as the oil- and gas industry (incl. coal-bed methane (CBM)) geothermal energy production. The common purpose of these oil partially is to achieve a higher production rate per well without increasing hydraulic gradient significantly. In systems ultimate objective improve heat extraction performance enhanc...

To simulate the propagation law of hydraulic fractures in deep Coal Bed Methane (CBM) reservoirs Qin-shui basin, a 3D numerical model is established using continuous-discontinuous algorithm, and discrete fracture network (DFN) included to increase its heterogeneity. The control variable method was employed study effects situ stress, random number, fracturing fluid flow viscosity on propagation....