The evaluation of 24 wells representing 339 stages of fracture stimulation which produce from the Lance interval in the northeastern Pinedale Anticline area of the Green River Basin, Wyoming has been conducted to determine if the use of a micro-emulsion (ME) surfactant intended to reduce permeability impairment and improve load recovery, had any observable benefits. The well group consisted of wells in a limited contiguous six square mile area, with 10 wells having 1.5 gallons of ME per thousand used throughout the fracture stimulations, but at no other time during in-well operations. Fourteen wells completed approximately nine months earlier had no micro-emulsion used during stimulation or other in-well operations. Based on the matched reservoir properties and effective degree of stimulation, 20 year forecasts were performed for each well. Then comparisons of those results and various treating parameters were used to assess the potential benefit arising from using ME. The determination of potential benefit was assessed using classical statistical methods to ensure that the interpretation was as unbiased as possible. From that analysis, there is distinct and clear benefit from using the micro-emulsion to facilitate placing the fracture stimulations, to increase effective fracture length, to minimize damage arising from operational shut-ins and especially to increase gas recovery and net present value of wells in which the micro-emulsion system is used.

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