By OGJ editors
HOUSTON, Nov. 12 -- Madisonville Gas Processing LP started up a gas treatment plant expansion at Madisonville field in Madison County 100 miles north of Houston to handle sour gas from the Cretaceous Rodessa formation at 12,000 ft.
The expansion is accepting 20 MMcfd of gas and is expected to reach its 50 MMcfd capacity by the end of November, said GeoPetro Resources Co., San Francisco. MGP purchased the field's existing 18 MMcfd treatment plant from Hanover Compression LP in July 2005.
Upon completion of the plant expansion, GeoPetro plans to produce the Fannin and Magness wells at rates higher than when plant capacity was 18 MMcfd. It also plans to produce the Mitchell well, shut-in awaiting a workover and the plant expansion, and in early 2008 the Wilson well if a frac job is successful.
Madisonville oil and gas field was discovered in 1945 and was developed with 125 wells in shallow zones, but the Rodessa was left undeveloped because the gas contained hydrogen sulfide.
The Magness well, drilled n 1994, had 139 ft of net pay in Rodessa and flowed sour gas with 28% of impurities. It flowed 12 MMcfd from 10 ft of perforations on a 22/64-in. choke with 3,915-3,919 psi flowing wellhead pressure. It flowed at 20.8 MMcfd on recompletion in October 2001, and CAOF was 176 MMcfd. Deliveries began in May 2003.
The Fannin well has 146 ft of Rodessa pay and went on line in early 2006, after which GeoPetro drilled the Wilson and Mitchell wells.