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Articles 1411 - 1415 of 1415
Full-Text Articles in Entire DC Network
Developing Methods For Placing Sand-Propped Hydraulic Fractures For Gas Drainage In The Bulli Seam, K. Mills, R. Jeffrey, D. Black, T. Meyer, K. Carey, S. Goddard
Developing Methods For Placing Sand-Propped Hydraulic Fractures For Gas Drainage In The Bulli Seam, K. Mills, R. Jeffrey, D. Black, T. Meyer, K. Carey, S. Goddard
Resource Operators Conference
BHP Billiton Illawarra Coal is seeking ways to significantly increase gas capture rates from in seam drilling programs in its underground coal mining operations. Hydraulic Fracture Technology (HFT), a joint venture between SCT Operations Pty Ltd and CSIRO Petroleum, is working with Illawarra Coal to develop the capability to enhance gas drainage rates in the Bulli Seam using sand-propped hydraulic fracturing based on HFT’s experience at Dartbrook Mine where gas drainage rates were increased by 5 to 180 times. One of the principal challenges for implementing sand-propped hydraulic fracturing in the Bulli Seam is the high vertical stresses that cause …
A Website On Coal And Gas Outburst Management, D. Vyas, N. Aziz, R. Caladine, L.Ucia Tome
A Website On Coal And Gas Outburst Management, D. Vyas, N. Aziz, R. Caladine, L.Ucia Tome
Resource Operators Conference
The University of Wollongong received funding from the Australian Coal Association Research Program (ACARP) in 2005 to develop a website on coal and gas outbursts in the Australian environment < www.uow.edu.au/outburst >. The primary objective of the website is to provide the coal mining industry with the information on outburst occurrence and mechanisms of outburst phenomenon and the means of treating it. The online system provides access to the experiences, knowledge and information acquired by the coal mining industry, research organisations and educational institutions in a quality controlled environment. Although the website is specific to the Australian scene, it nevertheless contains information …
Joint Structure And Coal Strength As Controls On Rib Stability, Ross W. Seedsman
Joint Structure And Coal Strength As Controls On Rib Stability, Ross W. Seedsman
Resource Operators Conference
The assessment of the stability of coal ribs needs to consider not only the impact of the cleating and jointing in the coal but also the possible onset of failure of the coal itself. The same planar, wedge and toppling failure modes seen in pitwall slopes can be present in underground roadways. A 20o offset of the roadway from the strike of the through-going joints reduces the fall hazard, but a 35o offset may be required to reduce delays in installing support. Mining-induced fractures (MIF) in coal may be a manifestation of brittle rock behaviour and its preferential location at …
Surface Goaf Hole Drainage Trials At Illawarra Coal, T. Meyer
Surface Goaf Hole Drainage Trials At Illawarra Coal, T. Meyer
Resource Operators Conference
Surface goaf gas extraction methods are successfully applied at a number of Australian and overseas underground coal mines. BHPB Illawarra Coal has recently undertaken a trial program to determine the effectiveness of surface goaf wells to reduce gas concentrations within the longwall ventilation circuit, and minimise gas related production delays. Three trial wells have been completed within the Bulli Seam operations. Considerable production variation between the three wells was recorded. A goaf gas reservoir model is discussed which describes a sequence of permeability changes within the different goaf strata, dictated by stress changes associated with caving, then recompaction. A requirement …
Ground Vibrations Arising From Using Two Types Of Explosives - A Comparative Study, S. M. Hossaini, Gour Sen
Ground Vibrations Arising From Using Two Types Of Explosives - A Comparative Study, S. M. Hossaini, Gour Sen
Resource Operators Conference
Results of an investigation into ground vibrations carried out in an open pit coal mine in New South Wales has been analysed. As this mine is located in a sensitive area in regard to potential damage from ground vibrations, severe restrictions were imposed on the blasting operations. In this study 44 sets of recorded experimental blast data have been analysed. Two valuable equations have evolved from the data when two types of explosives were used. A comparison between the effects of two explosive types, namely ANFO and slurry, on ground vibration is presented. It has been shown that the intensity …