Here is an article by Merrion Oil and Gas Investment Manager, George Sharpe. This article was published by Farmington Daily Times in March of 2017 that describes the fracking process. It explains permeability and the different factors that effect fracking such as flow rate and reservoir pressure.
The article also writes of why we frack, stating “fracking is absolutely essential to be able to produce from a shale at any rate, much less a commercial rate”.
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