Improving the hydrocarbon recoveries for reserves is actually regarding new technologies and better porous media understanding. Approximately 300,000 millions barrels of additional extra heavy oil were exploitable from Orinoco Belt in Venezuela if suitable explotation strategies were oriented to profit natural mechanisms from existing oil reserves.

The purpose of this paper is to study the sensibility of the activation energy and frequency factor of chemical reaction in heavy oils of the Orinoco Belt in Venezuela. This model accounts for the kinetics of physical changes that occur in the morphology of the gas-oil dispersion. Non-equilibrium reaction model was used in order to model foamy oil behavior observed at SDZ-182 horizontal well in Zuata field. Foamy oil modelling requires the investigation of the activation energy and frequency factor ranges that describes the non-equilibrium reaction model. These ranges were used to obtain a reasonable 3-years history match of SDZ-182 well. Activation energy ranged from 0 to 0.01 BTU/lb-mol and frequency factor ranged from 0.001–1000 1/day for first reaction. For second reaction, activation energy was 50×103 BTU/lb-mol and frequency factor 2,75×1012 1/day. Parameters of the second reaction are more sensitive to any variation than first reaction parameters. This paper describe suitable methodology to match foamy oil behaviour in horizontal wells under cold production and steam stimulation processes.

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