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Some shale gas and oil wells undergo month-long shut-in times after multi-stage hydraulic fracturing well stimulation. Field data indicate that in some wells, such shut-in episodes surprisingly increase the gas and oil flow rate. In this paper, we report a numerical simulation study that supports such observations and provides a potentially viable underlying imbibition and drainage mechanism. In the...
Shale swelling during drilling is attributed to osmotic pressure, where low‐salinity water enters the shale pores to cause swelling. Low‐salinity water injected into high‐salinity Bakken formation could similarly enter the matrix pores to displace oil by countercurrent flow observed in core experiments. As a result, we believe, low‐salinity water can potentially enhance oil recovery from oil‐wet Bakken...
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