Definition - What does Wellbore mean?
A wellbore is a hole drilled in the earth's surface to extract water or hydrocarbons (e.g., crude oil, natural gas, and associated condensates) to the surface. It is a straight shaft and the hole that forms the well. A wellbore may be cased with cement and steel to increase stability.
A wellbore is also known as a borehole.
Corrosionpedia explains Wellbore
Usually a cased and cemented wellbore or borehole is necessary to extract valuable resources such as crude oil or natural gas from the earth's surface. Large economic losses are possible if the drilled well becomes unstable.
A borehole may also refer to the diameter inside the wellbore's wall.