TECHNIQUE - CONVENTIONAL SHORE CROSSINGS

PILOT HOLE
A small diameter pilot hole is drilled under directional control to a predetermined drilling profile using either a jetting bit or a mud motor attached to a drill string. Once the Drill Bit breaks through the Seabed at the HDD Exit the Pilot Hole Operation is complete.

REAMING
After completion of the Pilot Hole, the drilled hole is enlarged to suit the product pipe or conduit to be installed. Depending on the geotechnical conditions several passes may be required each progressively enlarging the hole to the required diameter. The reamers will be attached using a small marine support vessel and drill pipe is added behind the reamer as it is pulled from Offshore to shore.

PULLBACK
After completion of the Reaming Operations an swivel and barrel reamer are placed in between the Product Pipeline and the drill string on board a suitable barge. The Drill rig pulling on the drill string pulls the product pipeline or conduit into the borehole.