On March 15, 2005, I attended a SPE special workshop on “Accelerating Technology Acceptance,” and I came away from the workshop with one nugget that I’ve carried with me since. Bill dirks, who was then a vice president for Samson Canada, made a presentation entitled “The 10 BCF/Day Gap–Technology Acceleration Imperatives to Meet US Natural Gas Demand Over the Next Decade.” The key slide from the presentation is shown below.
1,600,000 Restimulation Candidate Wells in North America
Mr. Dirks stated that North America contained in exess of 4,000,000 wellbores, and his conservative estimate was that 40%, or 1,600,000 wellbores, had “bypassed pay or restimulation potential.” 1,600,000 wellbores is a big number and represents hundreds of thousands of barrels of oil and trillions of cubic feet of natural gas.
In a 2003 article entitled “Refracture Works,” the number of unconventional gas wells in low-permeability sands was estimated to be 200,000, and the authors wrote that at least 20% of those, or 40.000 tight gas wells, were restimulation candidates with a potential 12 TCF of incremental reserves recoverable following restimulation.
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