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→Multilateral wells
==Multilateral wells==
==Multilateral wells==
Multilateral wells are wells that have more than one branch radiating from the main borehole (Figure 165). Each branch can drain a separate part of the reservoir and produce into a common single wellbore. The advantage of multilateral wells is that, for the same number of drainage points, they can be somewhat cheaper than if separate wells had been drilled.
[[File:M91Figure165.JPG|thumb|300px|{{figure number|5}}Multilateral wells in the Tern field, UK North Sea (from Black et al., 1999). Reprinted with permission from the Geological Society.]]
[[File:M91Figure165.JPG|thumb|300px|FIGURE 165. Multilateral wells in the Tern field, UK North Sea (from Black et al., 1999). Reprinted with permission from the Geological Society.]]
Multilateral wells are wells that have more than one branch radiating from the main borehole ([[:File:M91Figure165.JPG|Figure 5]]). Each branch can drain a separate part of the reservoir and produce into a common single wellbore. The advantage of multilateral wells is that, for the same number of drainage points, they can be somewhat cheaper than if separate wells had been drilled.
==Coiled tubing drilling==
==Coiled tubing drilling==