Cross-measure directional drilling

The development of directional drilling in the coal industry has been driven by the need to provide reliable in-seam gas drainage ahead of development. The same technology has been utilised for cross-measure drilling in adjacent seams other than the working seam and also in surrounding strata. The equipment and technology utilised for the applications of directional drilling in cross-measure applications is identified. The process of designing both lateral and vertical aspects of the drilling is explained with specific reference to the limitations and practices of directional control during the inter-burden section of each borehole. Cross-measure drilling applications of in-seam pre and post gas drainage, goaf gas drainage, water management and in-rush protection as well as exploration are described to explain the ways the technology has been utilised.