Abstract
Among different types of enhanced oil recovery (EOR) methods, gas injection, or more specifically and commonly, CO2 injection, has been much in practice with the average recovery factor of 7%–23% over the globe. The large availability, low cost, and easily achieved miscibility condition are the main advantages of CO2 injection over the other sources of gases. In this chapter, a thorough investigation of fundamental and practical aspects of CO2 flooding into the hydrocarbon reservoirs is implemented. At the beginning, miscible and immiscible floods are introduced. Then the location and modes of injection as the essential points are reviewed. The experimental measures including core flood test, PVT experiments, and slime tube test are described. Afterward, the surface and subsurface CO2 injection facilities as well as the process design are discussed. In continuum, the applicability of the abovementioned recovery method is studied through both tight and gas reservoirs. Examining the CO2 impact on the surrounding environmental is analyzed in the final section of this chapter.
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