A more thorough explanation:

Definition: A deviation-well survey is an examination conducted to determine whether a well is located under someone else's land.

Example: If a property owner drills a well on their land, but the wellbore deviates and ends up under their neighbor's property, a deviation-well survey can be conducted to determine the exact location of the well and whether it is encroaching on the neighbor's land.

Explanation: A deviation-well survey is important to ensure that property rights are respected and that the well is not causing any damage or interference to neighboring properties. By determining the exact location of the well, property owners can avoid potential legal disputes and ensure that they are in compliance with local regulations.