Definition - What does Inclination mean?
Inclination, also known as well inclination is the angle of the deviation of a wellbore from the vertical path. For most vertical wellbores, inclination is the only measurement of the path of the wellbore. When used with fluids, a positive number indicates up-flow and a negative number may represent down-flow. Many times there is a necessity of drilling the well with a planned inclination. Inclination creates the difference between the actual and planned well paths.
Petropedia explains Inclination
The deviation of a wellbore from the vertical is measured in degrees. Many times wellbores are drilled with an inclination. Such drilling is called directional drilling. A directional well profile is the planned well trajectory from the surface to the final drilling depth.
Wells are drilled with an inclination for several purposes such as:
- Increasing the exposed section length through the reservoir by drilling through the reservoir at an angle;
- Drilling into locations where vertical access is difficult or not possible such as in oilfields underneath a town, lake or a in a difficult-to-drill formation;
- Grouping more wellheads together on one surface location so as to allow fewer rig moves, less surface area disturbance, and make it easier and cheaper to complete and produce wells.