Prime Horizontal Gallery of Case Histories

UNDERGROUND INTERSECTS

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Maas Underground Intersect September 2001 800 m intersect 50 m under River Maas in Southern Holland. Project required guiding the entry hole, tripping out and guiding the drilling from the exit point to the underground intersect.

Rhone River Underground Intersect May 2002 30 m alleuvial gravel on each side of Rhone River. 1,036 m crossing. Elevation change 140 m. Gravels prevented use of conventional techniques.

Boston Underground Intersects June 2003 Offshore horizontal crossing 3,800 ft. Difficult hole cleaning conditions prevented use of conventional techniques. Successfully completed underground in less than 36 hours. Azimuthal accuracy = ±0.5°.