Nonaqueous fracture fluids clean up faster

GAS STORAGE DELIVERABILITY-2Tip-screenout and liquid CO2 with proppant fracturing treatments can both be highly effective for deliverability enhancement in gas storage wells. Each, however, has distinct advantages and disadvantages.This second of a four-part series (Part 1 is in OGJ, Nov. 15, 1999, p. 43) discusses the results of a DOE project that investigated these two fracturing methods.Tip-screenout is perhaps the most familiar technique and is cost effective, although the introduction of significant water volumes to the storage horizon may require years to clean up. Precautions must also be used to avoid uncontrolled fracture-height growth.Gas-storage formations are often highly sens...

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