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Abstract

Guided long-hole drilling (GLHD) is a fairly new exploration technique aimed at reducing the geological risks in coal mining. This report describes the limited progress made on further development of sensing systems for GLHD over a period of about 4 months before the work was terminated when it was decided that the technique should move on from the research phase to the evaluation and demonstration of the technology in a series of validation trials. It was seen that certain fundamental drilling problems needed to be addressed and solved before any improvements in survey probe technology were deemed to be worthwhile pursuing. Some small advances were made, however, notably in inclinometers for measurement-while-drilling (MWD), magnetometer probes, caliper probes, and non-aqueous drilling fluids. On the other hand, there was negligible progress in other planned areas of work, ie. other aspects of MWD, longer range strata interface sensing, strata boundary sensing close to the bit, non-magnetic azimuth measurement, and the more efficient statistical use of survey probe measurement data.

Additional information

Authors: GIBSON M J, British Coal Corporation, Technical Department, Nottingham (GB)
Bibliographic Reference: EUR 14165 EN (1991) 20 pp., MF, ECU 4
Availability: (2)
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