Playbooks Supplements

Scoop-Stack Playbook 2017

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SCOOP/STACK: PRODUCTION FORECAST 48 | September 2017 | hartenergy.com an example and contrast, figure 9 shows GOR for all wells/all zones and figure 10 shows GOR perspective for the Woodford Formation only. Horizontal drilling impact on EURs Despite recent hardships in the oil and gas indus- try, the Scoop/Stack area has experienced renewed interest and revitalization by horizontal drilling while remembering its past is home to some of Oklahoma's legacy hydrocarbon production. Com- panies continue to test which areas show the most promise and what completion processes provide the best well performance. Utilizing scatter plot visualization confirms the dramatic effect horizon- tal drilling and new completion techniques have made. Comparing well completions by year dis- plays constant improvement in well performance and EUR totals year-to-year with an upward trend (Figure 6, below). Footage drilled vs. well performance How has the length of the well impacted economic success? Taking the same dataset, TGS compared footage drilled vs. well performance over time, nor- malized for horizontal well type only, to ensure data integrity by utilizing comparable well types (Figure 11). Looking first at the play over-all (all zones), OPPOSITE PAGE FIGURE 7. The oil EUR map shows the highest performing wells clustered across the central to eastern Stack and highlight the central and southern part of the Scoop. FIGURE 8. The gas EUR map shows the highest performing wells focus on western side of the Stack and highlight western and southeastern part of the Scoop. The value of the well based on commodity type abruptly shifts where the "big" wells are located. The EUR values can also be calculated by producing formation for further comprehensive analysis. FIGURE 9. Representation of GOR from Pennsylvanian through Silurion Hunton formations is shown. In general, TGS observes a transition from low GOR (black oil) along the northeast to dry gas in the southwest for the combined zones. FIGURE 10. TGS restricts the data to the Woodford Formation only and the transition from oil to dry gas in this source rock is more distinct. This suggests the liquids yield in the Woodford may be predictable along this trend. On the left display, the scattered distribution and clusters of downdip oil suggest fluid migration and/or source zones other than the Woodford. FIGURE 6. In the above plot the X-axis represents first production date and the Y-axis is a measure of well performance, in this case total EUR is used. Additionally, vertical wells are indicated as yellow circles and horizontal wells as blue triangles. There are 5,000 datapoints on the plot. Progressing across the X-axis first production date, a dramatic shift from vertical to horizontal completions intensifying in late 2012 and beyond is seen, correlating to rapid increase in well performance EURs. The industry continues to improve and verify optimum completion techniques, and trend lines indicate improvement will continue. 5,000,000 4,000,000 3,000,000 2,000,000 1,000,000 0 TOTAL EUR (BOE) Vertical Well Horizontal Well 2007 2009 2011 FIRST PRODUCTION MONTH 2013 2015 2017 Horizontal Wells in Scoop/Stack - Average Footage Drilled vs. EUR by Year

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