Breitling Oil and Gas has begun the re-entry of the Breitling-Davenport #1 well in Guadalupe County in the US state of Texas.

The well, which is expected to be completed within the next few weeks, is a re-entry of a vertical well in the Austin Chalk formation.

The company intends to re-complete in the Chalk as well as perforate and frac the Buda Lime and the Eagleford zones.

According to the company, both zones were ignored in the original completion that occurred in November 1991.

Breitling CEO Chris Faulkner said that back in 1991 no one knew how to complete and stimulate an Eagleford zone to unlock the hydrocarbons.

"The original logs from 1991 show we have a great-looking virgin Eagleford zone as well as a nicely formed Buda zone," Faulkner said.