Devon Energy Corp.’s Alma spacing pilot in the overpressured oil window of the Oklahoma STACK play tested five wells per section across a single interval in the Mississippian Upper Meramec, delivering 30-day production rates averaging 1,400 boe/d/well, of which 60% was light oil.
In addition to the strong initial production rates, early flow-back results from the Alma pilot indicate minimal interference between wells, suggesting potential for tighter spacing in the overpressured oil window, Devon says.
The Alma wells were drilled with 5,000-ft laterals. They were brought online on 12/64-in. chokes, gradually increased to 20/64-in.
In the overpressured oil window in southwest Kingfisher County, the Pony Express 27-1H well, drilled with a 5,000-ft lateral, recorded a 30-day average rate of 2,100 boe/d, 70% oil.
Devon says oil productivity from the Pony Express is the highest of any Meramec well drilled to date in the play on a per-lateral-foot basis.
After the Alma test, Devon says it has two successful spacing pilots in the core of the Meramec oil window. Production from the two-well Born Free pilot continues to perform well, achieving a 90-day average rate of 1,500 boe/d/well, of which 60% is oil. The Born Free pilot wells were 400 ft apart and landed in two intervals in the Upper Meramec.
Devon’s next pilot is the Pump House test in southwest Kingfisher County. The Pump House is testing seven wells per section in a single interval in the Upper Meramec. Initial flow rates are expected in the third quarter.
To determine the optimal approach for developing stacked-pay intervals in the Meramec, the firm is participating in several additional spacing pilots during the remainder of the year.
The spacing pilots are focused in the overpressured oil window, testing up to eight wells per section in a single Meramec interval and evaluating the joint development of multiple stacked-pay intervals through staggered well pilots.
The firm expects to start full-field development in 2017.