Underground Construction - June 2022 - 35

DIRECTIONALDRILLING
Intersect Bore Through Marshland
Succeeds in Frigid Temps
Jeff Griffin | Senior Editor
Last winter, in bitterly cold temperatures
and snowy conditions, Ellingson
Contracting Inc. (ECI) completed a
difficult, 4,075-foot-long horizontal
directional drill (HDD) intersect crossing
of a swampy area in Michigan's
Upper Peninsula, to install 30-inch diameter
steel pipe.
The new pipe replaces an old segment
of oil pipeline that had floated
atop the marshlands. The project owner,
Enbridge, Minnesota Limited (MN
Limited), served as the primary pipeline
contractor, and ECI was the subcontractor
for the HDD segment.
Due to environmental concerns in
the marshland terrain, the decision was
made to execute intersect pilot bores
from opposite ends of the bore path.
The length of the bore and the intersect
of two bore holes would reduce the risk
of inadvertent returns of drilling fluids
from the pilot hole to the surface, said
Neal Roberts, ECI project manager.
An 800,000-pound pullback Prime
Drill 300 was set up on the entry side
of
the
bore. An American
Augers
440,000-pound pullback DD-440 drill
was on the exit side.
MN Limited prepared work areas at
entry and exit sites, including the work
pads for the drill rigs and access routes
to the equipment areas, which were
matted to support the heavy equipment.
Support equipment for each drill rig
included a mud recycling system, and
Prime mud pumps, drill pipe loads, mud
pump, water tanks, cuttings bins, and
tooling. Other equipment was placed in
a nearby staging area. The projected bore
path was about 50 feet from the existing
floating pipeline.
Drilling
Roberts said the Prime 300 was the
main drill rig on the project. It drilled
down approximately 90 feet and leveled
the path of the bore. This was the average
depth of the pilot hole, as well.
The Prime drill rig was equipped with
an Inrock 8-inch mud motor and used
a12.25-inch TCI bit. The American
Augers unit used the same size and
brand mud motor and bit.
UCONonline.com | JUNE 2022 35
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Underground Construction - June 2022

Table of Contents for the Digital Edition of Underground Construction - June 2022

Contents
Underground Construction - June 2022 - Cover1
Underground Construction - June 2022 - Cover2
Underground Construction - June 2022 - Contents
Underground Construction - June 2022 - 4
Underground Construction - June 2022 - 5
Underground Construction - June 2022 - 6
Underground Construction - June 2022 - 7
Underground Construction - June 2022 - 8
Underground Construction - June 2022 - 9
Underground Construction - June 2022 - 10
Underground Construction - June 2022 - 11
Underground Construction - June 2022 - 12
Underground Construction - June 2022 - 13
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Underground Construction - June 2022 - 19
Underground Construction - June 2022 - 20
Underground Construction - June 2022 - 21
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Underground Construction - June 2022 - Cover3
Underground Construction - June 2022 - Cover4
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