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- W2912239600 abstract "Water blockage is a type of formation damage that occurs because of capillary discontinuity at the interface between high-capillarity matrix and low-capillarity fracture. This water blockage causes a reduction in oil relative permeability and the need for higher drawdown to allow flowback after hydraulic fracturing. To remove this blockage, shut-in is believed to be effective because it dissipates the water blockage from the matrix-fracture interface deeper into the matrix through capillary imbibition. However, field data demonstrates mixed results – Some field data report shut-in as beneficial, whereas others detrimental. This paper investigates desiccation as one of the main reasons for the mixed shut-in implications. From the perspective of multiphase flow in porous media, our history-matched core-scale model reveals that shut-in can offer some benefits in desiccated water-wet cores but cause further damage in non-desiccated ones. Regardless of the desiccation, our simulation results show that immediate flowback can help ensure high oil relative permeability and remove the trapped water at the matrix-fracture interface more quickly. In a desiccated core, both immediate flowback and shut-in result in the same maximum regained oil relative permeability; however, in a non-desiccated core, immediate flowback results in a higher maximum regained oil relative permeability than shut-in." @default.
- W2912239600 created "2019-02-21" @default.
- W2912239600 creator A5035941722 @default.
- W2912239600 creator A5036570284 @default.
- W2912239600 date "2019-05-01" @default.
- W2912239600 modified "2023-09-24" @default.
- W2912239600 title "Effect of desiccation on shut-in benefits in removing water blockage in tight water-wet cores" @default.
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- W2912239600 doi "https://doi.org/10.1016/j.fuel.2019.01.180" @default.
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