Enhancing oil recovery from tight oil plays

Due to the combined technological advances in horizontal drilling and hydraulic fracturing, low-permeability sandstone (tight) and shale reservoirs have become economically viable production sources in North America over the past decade. Thousands of horizontal wells have been drilled into such unconventional reservoirs, allowing another, lower-quality tier of reservoir to be accessed. While these low-permeability resources offer vast potential reserves, the oil and gas trapped within cannot be extracted effectively without significant development costs, and further technology advancements that reduce uncertainty and extend the productive life of the well, Fig. 1.

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