I spent about a year working on the Sutter Buttes, of California.  Although it's not as in depth as the classroom, I did learn a lot of things about safety culture, and gas production.

Typically a gas well is dug to 8,500 ft.  The way the rig operates is they use Halliburton's directional drilling tools, which allow more holes to be driller per pad (4 holes), this reduces environmental impact.

Halliburton's drilling tools involve gyroscopic radio metric systems, which monitors the depth, speed, and at the same time, there is a group of people called "Mud-Loggers" who interact with the Geology of the gas-well, also measuring bore pressure using these installed instruments.

Well Casing (with a casing crew), is usually put the well Casing to 2000 ft.  This prevents any chemical contact coming into contact with the water table.  As the chemicals may be hazardous to environmental health.

Here is some photos of me and rig:

The rig: