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The crestal CO 2  injection can be used to control the flow of water in a strong bottom water reservoir. Pressure-Volume-Temperature and relative permeability studies were done under formation circumstances (50 MPa, 110 °C) to elucidate the mechanism of water-coning regulation. The findings of the PVT test demonstrated that CO 2  might shift the water phase downward, so regulating water-coning and lowering the viscosity of the oil, thereby preventing water break. The results of the relative permeability test indicated that CO 2  could reduce the relative permeability of brine, increase the relative flow capacity of crude oil, form a CO 2 -oil miscible bank concurrently, increase the efficiency of oil displacement by water flooding, and inhibit the formation of water-coning. An appropriate strong bottom-water block was chosen as a trial location for evaluating the water-coning control by CO 2  injection. The results suggested that crestal CO 2  injection was more successful in reducing water cut than the basic gravity effect. The results also indicated that CO 2  injection is a more effective method of controlling water-coning than water plugging.

Investigation on the water-coning control by CO 2 injection in strong bottom water reservoir