Southern Energy's Terrible Creek 21-2 #2 well in the Williamsburg Field in Mississippi stabilized at 2,300 mcf/d of natural gas plus 50 barrels of condensate per day at the end of a 72-hour flow test. That equals about 430 barrels of oil equivalent per day (boed). The rates are gross, and Southern holds a 50% working interest.
Test conditions
The Cotton Valley vertical well flowed without fracture stimulation. It ran on a 32/64-in. choke at a flowing tubing pressure of 435 psig.
A thicker interval than expected
The well cut a Cotton Valley "C" gross interval about 110 ft thick. That is more than two offset deep wells drilled in the 1970s had led Southern to expect. The company perforated 71 ft of net pay.
Gas condensate, not oil
Southern says the test results suggest a gas condensate reservoir. Analogous Cotton Valley reservoirs at Seminary, Collins and Northeast Collins show oil phase behavior, so the Williamsburg result differs from them. Southern is running fluid phase testing to confirm.
Next steps
Southern is building wellsite facilities and expects to bring the well on production by mid-November 2026. The company has started the land and regulatory processes to permit two follow-up Cotton Valley locations. It expects to spud the next well in early first quarter of 2027, subject to approvals.
That well would be the second of two commitment wells under the joint venture wellbore participation agreement announced on 26 May 2026. The Williamsburg result comes from upstream drilling, with the first sustained production still ahead.
