Drilling hole system for horizontal boreholes
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United States of America Patent
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-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Sep 3, 1997
filing date -
Sep 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilled hole (1) is produced by means of a drilling rod assembly comprig a succession of rod elements (7d) to be arranged end to end. For this purpose, a vertical shaft (2) is produced in the ground, of constant horizontal section and preferably insufficient for a man to be able to work towards the bottom of it, the rod assembly is displaced therein from an opening located in a front wall of the shaft, and the elements (7) of the rod assembly are selected so that they have an axial length less than the distance separating the said opening in the front wall of the shaft from the opposite rear wall.
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