Mechanism of Coal Seam Permeability Enhancement and Gas Outburst Prevention under Hydraulic Fracturing Technology

Gas Permeability Evolution Mechanism and Comprehensive Gas Drainage Technology for Thin Coal Seam Mining

A thin coal seam mined as a protective coal seam above a gas outburst coal seam plays a central role in decreasing the degree of stress placed on a protected seam, thus increasing gas permeability levels and desorption capacities to dramatically eliminate gas outburst risk for the protected seam. However, when multiple layers of coal seams are present, stress-relieved gas from adjacent coal sea...

Health Effects of Coal Seam Gas - Tara

I visited Tara on 11 and 12 October as requested, to undertake a review of individuals who believe their health has been adversely affected as a result of coal seam gas exploration being undertaken in the region. Queensland Health provided the consultation room with the Tara health facility, and also advertised my attendance, and made appointments for those families and individuals who telephon...

Effect of Water Invasion on Outburst Predictive Index of Low Rank Coals in Dalong Mine

To improve the coal permeability and outburst prevention, coal seam water injection and a series of outburst prevention measures were tested in outburst coal mines. These methods have become important technologies used for coal and gas outburst prevention and control by increasing the external moisture of coal or decreasing the stress of coal seam and changing the coal pore structure and gas de...

Improved Prediction Model for Determining the Lost Gas Content of Extreme-soft and Outburst-prone Coal Seam

Few study has been carried out on the desorption rules of extreme-soft and outburst-prone coal in south of China, especially coal from Hunan Province of which the value of “f” is normally less than 0.2. Desorption experiments are conducted on the coal samples from Hongwei and Jiahe Mines in Hunan Province, and the following phenomena can be observed: the calculating mean error by t method and p...

Hydraulic and Pneumatic Fracturing