Outburst Workshop A new operator’s perspective Scott Langley BHP Billiton Illawarra Coal.
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Transcript of Outburst Workshop A new operator’s perspective Scott Langley BHP Billiton Illawarra Coal.
![Page 1: Outburst Workshop A new operator’s perspective Scott Langley BHP Billiton Illawarra Coal.](https://reader036.fdocuments.in/reader036/viewer/2022081801/56649d415503460f94a1c6ac/html5/thumbnails/1.jpg)
Outburst Workshop
A new operator’s perspective
Scott Langley
BHP Billiton Illawarra Coal
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Illawarra Coal – Bulli Seam Workings & Longwall Layout
West Cliff Area 5
AppinArea 7
AppinArea 9
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Illawarra Coal –Wongawilli Seam Plans & Workings
Dendrobium Mine
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Key Threshold Limit Value (TLV) Areas
Boggy zone
Low permeability – increasing CO2
Dykes & Faults
Low permeability CH4 zones
Limited drainage window areas
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Recent experience – Remote mining
Boggy Zone MG703 & MG704• >200 m width• Gas content unknown m3/tonne, >90% methane• Remote mining
• 3 outburst events in MG703• Unable to drill into zone• 1 sample, post outburst, from lump coal off tail of miner ~9m3/tonne• Mined from both sides in MG703
• Currently mining from one side in MG704 • Achieved a few in-seam holes across the zone• 200+m mined to date; No outburst events
Low permeability zone inbye end TG705• 1 entry, 1 pillar, heavily drilled, not below limits• Some localised distortion of cleat structure • Remote mined• No outburst events
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Remote mining impacts
1/3 normal productivity• Reduces longwall float time – impacts preparation & increases
interaction• Additional cost per metre
Low interest work – stop & start, work & wait Increased management resources
Crosses critical zones safely
Used where necessary
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Impacts before remote mining
High intensity in-seam drilling• Equipment moves & interactions• Drill hole intersections• Reduced extraction system performance• Diverted in-seam drilling resources
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How to improve
Better drainage
More efficient remote mining
Better understanding of the appropriate limits for the various conditions
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Better drainage
Lead time• Surface To In-Seam (STIS) wells
Better information• Down hole tools for desorption levels, gas saturation level and gas content • Improved identification of methane genesis / permeability • STIS well logging techniques• Fibre optic flow sensing• Collection system monitoring
Faster short term drainage• Coil Tube Drilling (CTD)
Low permeability / high CO2• Nitrogen flushing
Boggy zone• Surface vertical or STIS drilling• Tight radius drilling (TRD)• Large diameter augers• Advancing casing
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More efficient remote mining
Remote flighting with shuttle carsRemote operation of a road headerAutomated bolting – ACARP roadway developmentHaulage system alternatives
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Understanding Threshold Limit Values
Appin – West Cliff plan consolidationWongawilli appropriate levels for future miningDifferent CH4 sourcesNitrogen flushing impact
Oil & gas industry tools for determining gas saturation levels and under saturated fields.
• Compare different gas regimes• Create an alternate to cores for evaluating gas content
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Conclusion
Seam degasification is a major component of Bulli Seam operations; ~160,000 metres per year drilled at Appin alone
Meeting TLV’s drive significant effort in localised areasReduction to 3-4 m3/tonne yields highest mining productivityEfforts are focused on improving drainage & remote mining
productivity Integration of the West Cliff & Appin management plans is the key
activity regarding levels. Recent experience shows outburst events occur at levels above the
current thresholds Improved tools are the preferred method to re-evaluation of the
appropriate TLV’s