The Effect Of Oil Recovery On The

Solvents can be recycled and re-injected into the formation and the development cost decrease over time. In this method, heat stimulation is introduced through production well as shown in Fig. In electrical heating based TSR, electrical heater is set inside the well to heat the reservoir fluid near the wellbore. In TSR method, the introduced heat vaporizes the solvent produced with the oil back to the formation, improving the efficiency of solvent recycling.

Firstly, the introduced heat can further reduce the viscosity and increase the mobility of the reservoir fluid.

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Secondly, the high temperature increases the dew point of the injected solvent and significantly prevents the solvent condensation. Both of these two methods are less vulnerable to condensation phenomenon, which could reduce the efficiency of solvent dissolution.

The latent heat introduced by both method will further reduce the oil viscosity and accelerate the speed of diffusion and dispersion. Two horizontal well are set in the formation, the top one is the injection well and the bottom one is the production well.

Low SOR. High production rate. The viscosity of the oil is further reduced due to the combination of thermal and solvent effect.

In an idea case, the solvent can prevent the steam to condense, while the steam provides the expanding force of the vapor chamber. Compared with VAPEX process, the high temperature provide by the steam can maintain the solvent in the vapor phase and accelerate the velocity of diffusion and dispersion. The EOR mechanisms of the steam and solvent are both magnified due to this interaction.

The variation of the oil drainage rate with different type of solvent is shown in Fig.]

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The efficiency of production can be increased by employing more advanced methods, i. The Polish Oil and Gas Company iwork with Polish oilfields, where currently primary methods are applied, but the Polish experiences with EOR date back to the years In view of high oil prices, reconsidering EOR as a production method is economically justifiable. Therefore, it is purposeful to implement new pilot technologies, aimed at implementing new technologies, understanding accompanying phenomena, and calibrating of simulation models, including economical models for an optimal control of the oilfield exploitation. Key words. However, owing to high costs, these methods have not been commonly applied or developed. This problem can be encountered especially by The Polish Oil and Gas Company in its work with Polish oilfields, where currently primary methods are applied.

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