Well · Exploration
Exploration Well
The first well drilled on a prospect, where little is known for certain about the subsurface, also called a wildcat.
What it does
It tests whether the trap really holds oil or gas. Because pressures are uncertain it needs an experienced crew and solid well control equipment, and it gathers the cuttings, cores, logs and tests that decide what comes next.
Basics
| Also called | Wildcat |
| Main risk | Unknown pressures, kicks |
| Collects | Cuttings, cores, logs, tests |
Common failures
- Unexpected high pressure zone that causes a kick
Troubleshooting
- Symptom
- Gas readings and pit volume rising while drilling
- Likely cause
- Entering an overpressured zone
- What to check
- Follow well control procedures and weight up the mud