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Hydraulic fracturing stimulates fracture swarm in reservoir formation thoughpressurized injection fluid. However restricted by the availability offormation data, the variability embraced by reservoir keeps uncertain, drivingunstable gas recovery along with low resource efficiency, being responsible forresource scarcity, contaminated water, and injection-induced earthquake.Resource efficiency is qualified though new determined energy efficiency, ascale of recovery and associated environmental footprint. To maximize energyefficiency while minimize its' variation, we issue picked designs at reservoirconditions dependent optimal probabilities, assembling high efficiencyportfolios and low risk portfolios for portfolio combination, which balance thevariation and efficiency at optimal by adjusting the proportion of eachportfolio. Relative to regular design for one well, the optimal portfoliocombination applied in multiple wells receive remarkable variation reductionmeanwhile substantial energy efficiency increase, in response to the call ofmore recovery per unit investment and less environment cost per unit nature gasextracted.

Design Diversity for Improving Efficiency and Reducing Risk in Oil and Gas Well Stimulation under Uncertain Reservoir Conditions