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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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