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Frishmuth
Consulting Services, LLC
Dr. Ronald Frishmuth, P.E.
P.O. Box 690626
Houston, TX 77269-0626
Voice (281) 807-0203
FAX: (281) 807-9134
For further information:
info@applied-mechanics.net
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Structural Design
These two photos show a coiled
tubing drilling rig in
operation on the North Slope oil field in Alaska. This structure was
designed by Dr. Frishmuth. As shown
in the photos, the tower platform structure was designed to be placed
over a typical North Slope well house without having to remove it from
the site. The system was
designed to have a Blow Out Preventer (BOP)
stack attached to the top of the production tree at the level of the
platform. The tower itself
is then assembled over the
BOP stack and anchored to the platform base with pins and cables.
 The
coiled tubing injector is located at the top of the
tower. The loads on the structure
include side pull at a 45 degree angle from the top of the injector
head. This force arises from the coiled tubing reel. Additional load
is imposed by the weight of the coiled tubing string downhole. These
forces enter the structure at the top of the injector head. Additional
distributed loads arise from wind loading. These side loads try to
overturn the structure thus
requiring outriggers to provide stability. Rig up time for this
structural system is approximately 10 to 12 hours and rig down time is
about 8 hours.
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