Over the last decade, an industry wide shift to unconventional plays has occurred due to advanced drilling and completion technologies allowing the recovery of previously uneconomic reserves. A notable play in this category is the Bakken formation in the Williston Basin. Through the application of horizontal drilling and innovative completion design, the recoverable reserves in the Bakken are now estimated at 3.65 billion bbl of oil. Through multiple case study wells and direct offset comparisons, this paper analyzes production results for two completion methods employed in the Bakken today: cemented production liners with "plug and perf" stimulation and open hole, multi-stage system completions. Additionally, production differences based on stage number, stage interval length, and 640 acre spacing versus 1,280 acre well spacing are presented. The trend to increase stage density in extended-reach, horizontal wells in the Bakken requires leading-edge technology to maintain operational efficiencies and improve overall well economics. With the introduction of new "high density" technology to open hole, multi-stage systems, these requirements are exceeded with maximum stage density capability allowing for decreased completion time and lower-risk stimulation practices compared to conventional methods.
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