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of laying down the derrick, disassembling the substructure, and
transferring additional loads onto flatbed trucks.
Skid-beam system
The skid-beam system, currently used on three of Santa Fe's
rigs, was first used in Kuwait about 2 years ago. Basically, the
system works as a trailer. When it comes time to move, the skid
beam trailer is rolled under the substructure and pinned into place
through a series of bolts and pins (Fig. 18.3).
Figure 18.3 - Mobile drilling rig with telescoping derrick
Next, the rig is jacked up using the HPU, and braces are
pinned in next to the wheels. These rigs have front and rear-wheel
hydraulic steering capabilities.
Two Kenworths are hooked up in the front for pulling.
Under rough conditions, a dozer is used to push from the back.
According to Mike Howe, transport general superintendent for
Santa Fe, Rig 3, a 3,000-hp unit rated to 30,000 ft, "may be the
largest land rig in the world that can be moved mast up.”
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