A borehole with mechanical constructions (called well completion) to facilitate liquid transportation between surface and Petroleum Reservoir.
The most popular types of Petroleum wells are:
| Oil producer | Gas producer | Gas injector | Water producer | Water injector | Observation well |
| Commercial oil production | Commercial gas production | Gas flooding | Water supply for Waterflood projects | Waterflood projects | Monitoring reservoir dynamics |
[ Producing well (Producer) ][ Injecting well (Injector) ]
[ Well Drilling ] [ Well completion ]