UNCONVENTIONAL GAS TECHNOLOGY—2: Custom technology makes shale resources profitable

Low permeability shales are unconventional gas reservoirs that are being more efficiently exploited with newly developed production technologies.This series began last week, with an article discussing advances in fracture stimulation techniques and fluids used to improve tight gas production (OGJ, Dec. 17, 2007, p. 39).The final article in this series, to be published next month, deals with coalbed methane (CBM) production.ShalesThere are technical difficulties in producing gas from shales, which have ultralow permeabilities and vary in brittleness. Multilayered shale reservoirs have widely varying reservoir characteristics and flow mechanism regimes. Formations typically have high capill...

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