Two-pipe on-grade directional boring tool and method
A method and apparatus for boring a close tolerance on-grade subsurface borehole. A downhole tool assembly for use with a dual member drill string comprises a directional boring tool. The dual member drill string comprises an outer member and an inner member disposed within the outer member and rota...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
07.12.2004
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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