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The Directional Drill Monitor For Long Hole Gas Drainage In Coal Mines
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Citation (Style = APA)
Skybey, G. (1992). The Directional Drill Monitor For Long Hole Gas Drainage In Coal Mines. 11th International Conference on Ground Control in Mining Proceedings (ICGCM) 11th
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Skybey, G. (1992). The Directional Drill Monitor For Long Hole Gas Drainage In Coal Mines. 11th International Conference on Ground Control in Mining Proceedings (ICGCM) 11th
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 5
Publication Date:
Jan 1, 1992
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Abstract
Abstract
| The Directional Drill Monitor (DDM) is an advanced instrument for real time in hole surveying. It was developed by Du Pont (Australia) to suit Australian gassy coal mining conditions. The instrument consists of three units: i. Down hole transmitter ii. Acoustic transducer iii. Data receiver processor unit (i.e. up hole unit). This paper describes the function of each unit in detail and highlights the importance of the DDM in long hole drilling efficiency. Surveying is carried out independent of hole depth. Each survey takes 2-3 minutes to complete, the frequency of surveying to control borehole trajectory is determined by the accuracy required for a particular hole. The DDM is currently being used successfully for long hole drilling in a number of collieries. A high degree of directional control has been achieved. Borehole trajectories were controlled to within +l¬2m of the planned path with intersurvey distances varying between 6 to 18 metres over distances up to 700 metres. |
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