New Modeling Work: Fate of Fracking Fluid Rather than inject captured CO 2 into depleted shales, it makes more sense to build a larger pipeline to transport the CO 2 to a more suitable injection location like the Illinois Basin. For example, injection of emissions from just the four largest coal-fired power plants in southwest Pennsylvania requires many thousands of wells in the Marcellus Formation.
The overall finding was that large-scale injection of CO 2 is not feasible because of the excessive number of wells required to inject significant quantities of CO 2. While being a reduced-order model, the results obtained matched gas production data very well, which gave confidence that the two-component model was reasonable. The model involved two-component (methane and CO 2) single-phase (gas) flow in the shale rock, and included competitive sorption as well as pressure-dependent nonlinearities. In earlier work on shale gas systems, the Celia group developed a model for CO 2 injection into depleted shales and analyzed the feasibility of large-scale CO 2 sequestration in shales. Modeling results indicate that the large amount of fracking fluids left underground is unlikely to pose any significant environmental risk.Įarlier Modeling Work: CO 2 Sequestration in Shales
That modeling work has now been extended to study the fate of fracking fluids in shale-gas systems. In earlier work, the Celia group studied CO 2 injection into depleted shale-gas systems and concluded that it was not feasible for most situations.
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