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Accurate directional borehole drilling: a case study at Navajo Dam, New Mexico.

Authors
Kravits-SJ; Sainato-A; Finfinger-GL
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9102, 1987 Jan; :1-25
NIOSHTIC No.
10005752
Abstract
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.
Keywords
Surface-mining; Surface-properties; Underground-mining; Mining-industry; Coal-mining; Room-and-pillar-mining; Tunneling; Construction
Publication Date
19870101
Document Type
IH; Report of Investigations
Fiscal Year
1987
NTIS Accession No.
PB88-232152
NTIS Price
A03
Identifying No.
RI-9102
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9102
State
NM; PA
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