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EOG Upton County Wolfberry Activity


Everyone is familiar with the EOG operations in Eagle Ford, Haynesville, Marcellus etc.  But they also have been active in the Wolfberry this year in the ongoing crusade to become 50% liquids/50% gas.  First for some background, lets look at their Wolfberry Trend wells that came online since 2004.  Below is the historical production chart generated from HPDI Production Tools.  Currently they are producing 45,000 BOPM and about 90,000 Mcfpm from a little over 50 wells.

Companies operating in the Wolfberry trend seek dual production from the shallow Spraberry and the deeper Wolfcamp deposits.  The Wolfcamp can be hit or miss with sweet spots all through the trend.  Upton county is the location of many of the sweet spots and EOG does have operations in this area.  Here is a map of the EOG Upton leases colored by maximum monthly production.  Quite a few of the leases have max above 200 BOPD, including the Halff Estate 20 lease at 547 BOPD  indicated by the purple dot.

And here are their 2010 Upton County permits.  One interesting takeaway from this chart is that almost half of their 20 permits are in the Halff Estate 20 lease.  At a recent Wolfberry SPE meeting in Midland, a popular topic was the issue of spacing. What will the trend be in terms of well density?  Some people were talking about 15 and 10 acre spacing.  EOG has been open in their other operations about how they believe in some of these unconventional reservoirs it is necessary to produce many wells at the same time on the same lease as oppose to producing one well, then coming back much later and producing another.  I guess it’s the issue of cannibalization, and they can get the highest recovery factor if they produce many wells on the lease at the same time.

It will be something worth keeping an eye on in the future this issue of well density and the quality of performance of the infill wells.  For now, at least in Upton County, EOG found one of their sweet spots and is content to drill it up now and not wait.

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Justin Birmingham

Justin Birmingham is a Research Analyst at Drillinginfo. He creates proprietary research studies, works with statistical models and manages datasets for the DI Analytics team. Justin earned his Bachelor of Science from Texas State University – San Marcos.