Page 9 - A Primer of Oilwell Drilling, 7th Edition

variety rotary drilling rigs might be used depending on the
Alocation and geography of the reservoir. 4
Petroleum Extension-The University of Texas at Austin
Offshore, the ocean environment plays an important role in rig
design. Rigs may be broadly divided into two categories: rigs that
work on land (fig. 25) and rigs that work offshore (figs. 26 and 27).
One type of offshore drilling facility is a platform. Although
drilling occurs from platforms, most companies use platforms for Rotary Rig
production of oil and gas rather than for drilling. Because this book
concentrates on drilling and not platforms, more information about Types
platforms is available in another PETEX publication: A Primer of
Offshore Operations.
if a platform is designed for drilling, the rig on the platform
operates just like a land rig. Several wells can be drilled from the
same platform, and the rig is moved or skidded over to the next slot
in the platform to begin a new well.

Figure 26. An offshore jackup rig

Figure 25. A land rig Figure 27. An inland barge rig

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