Global entropy solutions for systems modelling polymer flooding in enhanced oil recovery

Abstract In this paper, we obtain the existence of global entropy solutions for the Cauchy problem of the nonstrictly hyperbolic systems modelling polymer flooding in enhanced oil recovery, under a more flexible condition on the function β ( T ) , which models the adsorption of the polymer on rock. This work improves the previous results in the paper Lu (2013), where β ( T ) is limited to meas { T : β ′ ′ ( T ) = 0 } = 0 or β ( T ) = b T for a nonnegative constant b .

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