7 layers of protection isolate our well bore 
from its surroundings, preventing any 
exposure of chemicals, gas, or produced 
water with the environment

1. Conductor casing
2. Cement, sealing conductor casing in place
3. Surface casing
4. Cement, sealing surface casing in place
5. Production casing
6. Cement, sealing production casing in place
7. Tubing

The surface casing is drilled to a minimum depth of between 50 to 100 feet below the Trinity aquifer

Courtesy of Chesapeake Energy