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Mining Publication: Accurate Directional Borehole Drilling: A Case Study at Navajo Dam, New Mexico
Keywords: Boreholes Drilling
Original creation date: January 1987
Authors: SL Kravits, A Sainato, GL Finfinger
Report of Investigations - January 1987
Download PDF Document (2.46 MB)
NIOSHTIC2 Number: 10005752
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 9102, NTIS No. PB88-232152, 1987; :1-12
This report describes a project conducted by the Bureau of Mines in which the accurate directional drilling of a borehole was demonstrated with the objective of intercepting a designated target. The project was conducted at Navajo Dam in northern New Mexico at the request of the Bureau of Reclamation. Borehole survey and drill logs are provided in an appendix. The trajectory of the demonstration borehole was designed to intercept a 5-ft-radius target at the final or "punchout" distance of 885 ft. The elevation of the borehole at this distance was within the target; the borehole punchout coordinates were 8.81 Ft southwest of the target. As a result of the demonstrated accuracy, the Bureau of Reclamation has contracted the accurate drilling of boreholes as long as 600 ft from the inside of a short tunnel, to control water seepage in the right abutment. This resulted in a substantial cost savings compared to the original plan of constructing a longer tunnel and drilling 150- ft boreholes.
Image of publication Accurate Directional Borehole Drilling: A Case Study at Navajo Dam, New MexicoReport of Investigations - January 1987
Download PDF Document (2.46 MB)
NIOSHTIC2 Number: 10005752
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 9102, NTIS No. PB88-232152, 1987; :1-12
See Also
Cableless Electronic Surveying Systems for Horizontal Holes
Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal
Degasification and Production of Natural Gas From an Air Shaft in the Pittsburgh Coalbed
Demonstration of Remote Mine Seal Construction
Drill Rig Incident
In-Mine Test of the Bureau of Mines Preproduction Wireless Survey System
Noise Exposure and Overhead Power Line (OPL) Safety Hazards at Surface Drilling Sites
Probability of Encountering Coalbed Discontinuities During Vertical and Horizontal Borehole Drilling
Rapid Response Rescue Drilling System Development for Mine Rescue Application
Rotary Drilling Holes in Coalbeds for Degasification
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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