Encore plans 22-stage frac in Williston lateral

By OGJ editors
HOUSTON, Oct. 29
-- Encore Acquisition Co., Fort Worth, plans to apply a 22-stage frac in a Three Forks-Sanish (TFS) horizontal well in the Williston basin in order to compare single-stage and multistage frac effectiveness.

Encore completed its first TFS well in the quarter ended Sept. 30 in Bear Creek field in Dunn County, ND, where it previously drilled four other successful Middle Bakken wells.

It reported a completion rate of 1,500 boe/d from the Werre Trust 21-3H well, with a 3,700-ft lateral on a 640-acre unit and an open hole frac with 812,000 gal of slick water and 300,000 lb. of sand. Well cost was $4.1 million, or $600,000 below the company’s estimate.

At an offset to the Werre Trust 21-3H, Encore plans to apply a 22-stage frac to enable its technical staff to further compare the economics of multistage fracs and single-stage fracs with a follow-on re-frac in order to maximize the future returns of wells drilled in the company’s large Bakken-TFS acreage position.

Encore also plans to add a rig at the end of the fourth quarter of 2009 to increase production growth in the large, oily resource play.

Encore performed seven refracs in the quarter for a 7-day production uplift that averaged 184 boe/d. The company has run refracs on nine wells this year, adding a gross average of 80,000 boe/refrac for an average $330,000 or an average finding and development cost of $5/net bbl of reserves.

Two important refracs were at the Cherry Creek State 44-36H well that had 191 boe/d of increased production and the McCoy 44-36H well with a 263 boe/d increase, both in the Cherry Creek field area of McKenzie County, ND, where Encore has 77,000 net acres.

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