Over-Drilling
Thad was, is a no bullshit PE that nobody could buy, sort of like Scott Lapierre. This chart is self-explanatory but briefly, the closer together they (EOG?) drilled Wolfcamp A wells in Lea County, the worse they got. Parent/child interference has only become worse since this chart was produced 7 years ago.
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A former oil company CEO told me that his company found that 1320 foot spacing in the Delaware Basin was optimal, different companies may have reached different conclusions and this probably depends on how close to the core one's drilling site is. I assume the 1320 foot spacing would be in the core and wider spacing would be needed away from the core.