Wax precipitation from crude oil is a major problem faced by the petroleum industry during the depletion phase from reservoirs. Reservoir oil in contact with gas tends to get enriched in very heavy fractions that may precipitate as wax under some operational conditions. In order to alleviate the problem, it is necessary to have a model that can predict the conditions under which precipitation occurs. To simulate continuous contact of the injection gas and reservoir oil, forward and backward multiple contacts are considered in this work,. The equilibrated composition of the oil samples and the injected gas is computed by material balance and flash calculations. A modified multisolid-wax model is used to study the effect of mixture composition on wax-appearance temperature. The vapor and liquid phases are described using the Peng-Robinson equation of state. It is shown that the composition variation of the oil upon methane injection has very significant effects on the wax-appearance temperature.


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