Once you have chosen the areas most likely will be done drilling, which sometimes come to considerable depths, such as more than 6000 m in the United States. It begins to build high towers metal square section with transverse reinforcement of 30 m 40 m high, in order to facilitate the handling of heavy drilling equipment.

There are two common systems, Us Petroleum holdings use twice: percussion, which is the oldest and almost obsolete and rotation, which is used in most cases.