Experimental Investigation for Microscale Stimulation of Shales By Water Imbibition During the Shut-in Periods

Gupta, Aadish (University of Alberta) | Xu, Mingxiang (University of Alberta) | Dehghanpour, Hassan (University of Alberta) | Bearinger, Doug (Nexen Energy ULC)

OnePetro 

Imbibition of water into the shale matrix is known as the primary reason for inefficient water recovery after hydraulic fracturing treatments. The hydration of clay minerals may induce microfractures in clay-rich shale samples. The increased porosity and permeability due to induced microfractures has been considered to be partly responsible for 1) excessive water uptake of gas shales, and 2) increase in hydrocarbon production rate after prolonged shut-in periods. To test this hypothesis, it is necessary to measure imbibition-induced strain and stress under representative laboratory conditions. In this study, we conduct laboratory tests to 1) measure the strain and stress induced by water imbibition in gas shales and 2) investigate the effect of confining load on the rate of water imbibition. We conduct a three-phase study on rock samples from the Horn River Basin (HRB) and the Duvernay (DUV) Formation, located in the Western Canadian Sedimentary Basin.

  Country: North America > Canada (0.71)
  Geologic Time: Phanerozoic > Paleozoic > Devonian (0.46)
  Industry: Energy > Oil & Gas > Upstream (1.00)
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