Changes

==Designer wells==

==Designer wells==

Designer wells are types of high-angle or horizontal wells that have more than one intended target. This makes them more cost effective because the individual targets would have otherwise required several conventional wells to drain them effectively. One aim of a designer well could be to penetrate and drain more than one fault block. In mature fields, multitarget infill wells can increase the chances of finding an economic volume of oil. For example, in the Oseberg field, Norwegian North Sea, a designer well successfully targeted and lined up several fluvial channel sandstone bodies (Figure 164) (Ryseth et al., 1998).

[[File:M91Figure164.JPG|thumb|300px|{{figure number|4}}A designer well in the Oseberg field, Norwegian North Sea. The horizontal well section was planned to target several seismically defined, fluvial channel bodies within the Ness Formation (from Ryseth et al., 1998). Reprinted with permission from the AAPG.]]

[[File:M91Figure164.JPG|thumb|300px|FIGURE 164. A designer well in the Oseberg field, Norwegian North Sea. The horizontal well section was planned to target several seismically defined, fluvial channel bodies within the Ness Formation (from Ryseth et al., 1998). Reprinted with permission from the AAPG.]]

Designer wells are types of high-angle or horizontal wells that have more than one intended target. This makes them more cost effective because the individual targets would have otherwise required several conventional wells to drain them effectively. One aim of a designer well could be to penetrate and drain more than one fault block. In mature fields, multitarget infill wells can increase the chances of finding an economic volume of oil. For example, in the Oseberg field, Norwegian North Sea, a designer well successfully targeted and lined up several fluvial channel sandstone bodies ([[File:M91Figure164.JPG|Figure 4]]) (Ryseth et al., 1998).

==Multilateral wells==

==Multilateral wells==