A wellbore is any hole drilled for the purpose of exploration or extraction of natural resources such as water, gas or oil where a well may be produced and a resource extracted for a protracted period.
It is often used interchangeably with drill hole or borehole, though typically a "borehole" is referred to in ore mining, exploratory drilling, pilot holes for installing piers or underground utilities, or any other of a number of single use hole drilling.
It is estimated that wellbore instability results in substantial economic losses of about US$8 billion per year worldwide.
- Drilling rig
- Hydrocarbon exploration
- Oil and gas law in the United States
- Hubbert peak theory
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