The invention relates to an improved method for enhanced oil recovery using a miscible solvent system. According to the invention, the method consists in injecting the miscible injection fluid (260) into the hydrocarbon bearing reservoir (250) followed by the injection of the mobility control fluid (270) into the same reservoir (250), a pressurized volume of miscible injection fluid (260), such as Y-grade NGL supplied from the storage tanks (145) is pumped down the injection well (200) and injected into the hydrocarbon bearing reservoir (250), at a pressure at which the miscible injection fluid (260) remains miscible with the liquid hydrocarbons in the hydrocarbon bearing reservoir (250), then a pressurized volume of mobility control fluid (270), such as water, carbon dioxide and/or nitrogen supplied from the storage tanks (145) is pumped down the injection well (200) and injected into the hydrocarbon bearing reservoir (250), the recovery method using injection facilities located at the surface (110) including one or several storage tanks (145) connected through a line (140) to one or several injection pumps (130) for fluid injection down the injection well (200) through a line (120) and several separators (160) receiving the produced fluids from the production well (210) through a line (150) and separate liquids and gases from the produced fluids, the so separated liquids being conveyed through a line (170) and stored in the storage reservoirs (180), while the separated gases are conveyed via a pipeline (190).
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