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Experimental study on post-fracture oil-water displacement mechanism of tight sandstone reservoir with NMR
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The oil-water displacement after hydraulic fracturing can increase the
oil production and reduce the flowback fluid. The NMR technology is
applied to study the oil distribution in the core sample before and
after oil-water displacement. The main factors affecting the oil-water
displacement efficiency are revealed, and the theoretical basis and
reference are provided for the optimization of post-fracturing flowback
system in tight reservoirs. The results show that the displaced oil is
mainly from small pores, medium pores and macropores. The larger the
pore size, the higher the oil-water displacement efficiency. Strong
homogeneity of core samples and good pore-throat connectivity are the
main reasons for the higher oil-water displacement efficiency. The
oil-water interfacial tension is low, and the displacement efficiency is
improved. The cleanup additive in guar gum fracturing fluid can
effectively reduce the oil-water interfacial tension and improve the
oil-water displacement efficiency compared with the slick water
fracturing fluid.
Title: Experimental study on post-fracture oil-water displacement mechanism of tight sandstone reservoir with NMR
Description:
The oil-water displacement after hydraulic fracturing can increase the
oil production and reduce the flowback fluid.
The NMR technology is
applied to study the oil distribution in the core sample before and
after oil-water displacement.
The main factors affecting the oil-water
displacement efficiency are revealed, and the theoretical basis and
reference are provided for the optimization of post-fracturing flowback
system in tight reservoirs.
The results show that the displaced oil is
mainly from small pores, medium pores and macropores.
The larger the
pore size, the higher the oil-water displacement efficiency.
Strong
homogeneity of core samples and good pore-throat connectivity are the
main reasons for the higher oil-water displacement efficiency.
The
oil-water interfacial tension is low, and the displacement efficiency is
improved.
The cleanup additive in guar gum fracturing fluid can
effectively reduce the oil-water interfacial tension and improve the
oil-water displacement efficiency compared with the slick water
fracturing fluid.
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