Well Productivity/Service Sector.7 Jul 2018 13:12
Well spacings May be Too Tight, Completion Volumes Too Large
"In a separate paper also delivered at the conference, Schlumberger highlighted the other downside to suboptimal spacing: poorer than expected production. The company analyzed IHS data from 300 horizontal wells in the Avalon Shale of the Delaware Basin and found that child wells (the youngest wells on a pad site) were almost 30% less productive compared with parent wells."
"The Schlumberger study in the Avalon Shale also relied on modeling work to test new frac hit mitigation strategies that included volume reductions for hydraulic fracturing treatments."
In the evolution of well stimulation/Completion in Horizontal wells the industry has learned that the more Proppant and more water is placed into the reservoir the more oil is extracted that's why operators are doing bigger jobs with more frack stages and more clusters, but there is a downside to this.
The closer you complete a new well to an older one the more chance there is of well interference and a bashed well so operators try and find optimal well distance between Horizonal's too extract as much Oil in Place as possible called drainage effiencieny which can be as little 12/10/8 % of potential this is primary step in developing sections of acreage, so operators must reduce Proppant volumes to try and mitigate the risk of this occurring.
With Highlands PWP (Parent Well Protection) as it mitigates the risk so you can effectively drill wells closer to each other thereby increasing reserve as the Permian Test showed increases of 15% in a new well (Child's well) but don't forget in the article (Well spacings May be Too Tight, Completion Volumes Too Large) in tells us without mitigation a new well can be 30% less productive than the Parent Well, so the industry can increase the Proppant and large volumes but only if they use this technology.
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