The trépano, which is hollow, is bolted to a series of pipes

The steel bars are sounding, which revolve driven by the rotary table, located at the base of the tower, and united by a transmission chain with motors box maneuvers.

The rotary table has a hole in its center square, which slips a column of drilling in the same section, which falls under the trépano progresses.

From the top of the tower suspending gear, which allow lifting and lowering heavy equipment.

It starts drilling with the movement of the rotary table, until needed the addition of new bars poll, which was enroscan are approximately 9 m.

The operation is repeated as many times necessary.

The cuttings are dragged to the surface by pumping a suspension dense, formed by injecting an aqueous suspension of a special clay called bentonite that the technicians analyze constantly. Besides this sludge meets 2 other important functions: Revoca the walls of the drilling, avoiding or preventing landslides and cooled to trépano, it is heated in her work hard wear.

When it has drilled 100 to 150 m, entuba the pit with a metal pipe and cement hardening fast (cementing), in order to avoid possible landslides caused by leaks in water of water that pass through.

Inside of the main driving continues drilling trépano with a smaller diameter. In deep wells, these decreases forcing begin with diameters up to 550 mm.

Analysis of the injection means that when it is near the reservoir, by the presence of gases released by the same small cracks. It is customary drill also producing layer, which is then entuba with a perforated pipe to learn its thickness and facilitate the upwelling of oil.

Most often that drill vertically. This is accomplished by controlling the weight applied to trépano and its rotation speed. But it can also drilled obliquely, in the so-called directed drilling, diverting the trépano with wedges concave steel bars and sounding articulated, in order to reach deposits away from the vertical (under populated areas, seas, or to monitor wells to erupt through lateral injection of clay or cement). Currently, it is common to complete a hole with a cemented, which are then pierced with a bullet to driller.