Report: APP CMHS Project 1

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5.3. Gas Drainage

Gas is probably the single most critical issue that needs improvement in all underground coal mines. A number of options have been suggested in this report and are in response to activities that are either underway or have been considered for further development.

Current leading technologies successfully developed and applied in some of APP countries include:

  • integrated coal mining and gas drainage

  • overlying and underlying gas drainage tunnels

  • surface goaf drainage

  • SIS drilling

  • directional drilling.

R & D requirements to address the gaps in gas drainage technology and to meet future needs in APP countries include:

  • drainage drilling in deep seams

  • seam permeability enhancement technologies using hydrofracture technology or leaching organic or mineral material from coal

  • coiled tube drilling for rapid low impact drilling.

Among the current leading technologies, China has successfully developed and applied the integrated coal mining and gas drainage concept and processes while Australia is leading in SIS drilling and directional drilling technologies. These technologies can be shared among APP countries through technology transfer and demonstration projects.

As China and Australia are facing the greatest needs in gas drainage, a collaborative approach is recommended. R & D requirements are in two categories: pre-drainage and post drainage. Australia is leading in progressing pre-drainage technologies and China lead the post drainage development.

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