Which of these statements about oil drilling is false?

Points: 1

1. The derrick is the visible part of the drilling used to vertically introduce the drill strings down the hole.
2. Once a candidate drilling site is determined, the drillers make a hole of small diameter from 20 to 50 centimeters. This hole will generally go down to a depth of between two thousand and four thousand meters.
3. Exceptionally, certain wells exceed six thousand meters. One of them has even exceeded fifteen thousand meters.
4. Generally, the best position for the installation of the drilling equipment is vertically above the point of maximum thickness of the geological layer suspected of containing hydrocarbons.