Doglegs are changes in well angle or direction from a predetermined path, usually measured in degrees per 30 m. In directional drilling, the well angle constantly deviates from the vertical axis. A dogleg refers to a section of the well that changes angle faster than desired, usually causing bad effects. To limit this, Dog Leg Severity (DLS) is calculated to measure the maximum allowable dogleg that occurs while drilling. Doglegs can cause critical problems such as key seating, where the drill cuts additional rock on the side of the well and gets stuck in it.

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1. https://www.netwasgroup.us/engineering-4/effective-dip-angle-in-a-deviated-hole.html
2. https://www.egypetroleum.com/2016/03/dogleg-and-key-seating.html

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