With maturing U.S. unconventional basins such as the Permian and Eagle Ford in Texas rolling into full field development mode, questions are being asked about just how much industry truly knows about what it happening below ground following the completion of a horizontal well.
 
Simple formulas would dictate a certain land parcel with wells spaced at a certain distance would yield a specific potential for produced volumes; however, operators trying to get the most out of their acreage are finding some of their spacing recipes are too aggressive—and the wells are actually interacting with each other in negative ways.

“Even though we’ve drilled thousands of wells, the large resource area, the heterogeneous distribution of the rock properties, the large range of fluid types, the continuous evolving of completion designs…we don’t know what we’re doing,” Peter Duncan, president and CEO of MicroSeismic Inc., concluded to attendees at the recent Hart Energy Well Interference Forum, part of the DUG Eagle Ford Conference and Exhibition in San Antonio.

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