American Oil and Gas Reporter - April 2015 - 69

SpecialReport: Refrac Facts
gy Conference). Thirteen of the 16 oil wells had experienced declines of 85 percent or greater before the refrac.
The timing of the refracs ranged from nine to 43 months, with
a small difference between EUR increases on time-to-refrac groupings of nine to 12 months (50 percent EUR increase), 13 to 23
months (68 percent EUR increase) and over 24 months (49 percent EUR increase).
Because of oil and gas price volatility and variances in refrac
designs and costs, payouts are not estimated. The evolution of
a refrac design into an effective and economical treatment likely will take several jobs to deliver the best results. Incorporating learnings from fracture application and well performance into
successive treatments is critical. For this reason, many companies are considering refracturing campaigns rather than one-off
refracs.
The number of times a well can be refractured is probably a
function of the reservoir and the effectiveness of the initial refrac. As fracture designs generate increased contact area and propping effectiveness, the number of refracs possible on older wells
(fractured with earlier technologies) may increase, but newer wells
with better frac technologies may not be improved significantly. It is definitely a question for the future.
Ì

GEORGE E.
KING

George E. King is distinguished engineering adviser at
Apache Corporation with more than four decades of industry experience. He began his career with Amoco Production Research. King also served as a petroleum engineering consultant and new technology advocate at BP Amoco,
an adjunct professor of petroleum engineering at the University of Tulsa, senior vice president of engineering at Rimrock Energy LLC, and a consultant on completion, stimulation, intervention, shale well fracturing, and workovers.
He is a former Society of Petroleum Engineers distinguished
lecturer, and has served on numerous SPE committees and
workshops. King is a recipient of the Amoco Vice President's Award for Technology, SPE Production Operations
Award, and was SPE's Houston Region Engineer of the Year
in 2012. He holds a B.S. in chemistry from Oklahoma State
University, and a B.S. in chemical engineering and an M.S.
in petroleum engineering from the University of Tulsa.

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APRIL 2015 69



American Oil and Gas Reporter - April 2015

Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2015

Contents
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