Field experiences

CO2-EOR/CCS-related Projects

CO<span style="font-size: small;">2</span>-EOR/CCS-related Projects

Figure 1. Oil Saturation Change in the Reservoir (the color indicates oil saturation from blue to red.)
CO<span style="font-size: small;">2</span>-EOR/CCS-related Projects

Figure 2. Field Production Performance Comparison of CO2-WAG Case and Simple Water-flood Case
Client:　
Petroleum development company in Japan
Country:　
Southeast Asia
Year:　
2008 - 2009

Recently, “CO2-EOR/CCS” is brought to international attention, in which process CO2 gas is injected into geological formations. This process has the effect of enhancement of oil production which is very well known as EOR (Enhanced Oil Recovery) in the field of oil and gas development. On the other hand, that process leads to trap CO2 in deep geological formations semi-permanently, which is one of the technologies for the reduction of CO2 emissions called CCS (Carbon Capture and Storage). Our company has broad experience with reservoir simulation of each technology.

 

Most of EOR reservoir simulations are challenging area in numerical analysis. In EOR process, the phenomenon that doesn’t occur spontaneously in oil formations is induced artificially, which changes physical properties of reservoir rocks and multiphase flow system. Therefore, the mathematical model of that process is highly complicated, and it is so difficult to find the solution from the view point of numerical approach.

 

This project is the study of CO2 EOR to the oil reservoir which has been already developed for a long time. In this project, the numerical simulation of “CO2-WAG” was conducted, which is one of CO2 EOR. CO2 gas and water are alternatively injected into a formation in CO2-WAG process. In simple water-flood, some of the oil is trapped in a formation due to capillary effects and the like. In contrast, CO2 injection decrease trapped oil by inducing a kind of miscible state. As a result of this study, it was implied that CO2-WAG extends the life of oil production period than traditional water-flood. The implementation of this simulation and the interpretation of the results need deep knowledge about physical-chemical phenomenon and numerical analysis as well as reservoir engineering skills. Our high technological skills which are enable the development of reservoir simulators and advanced simulation studies led to make this project successful.

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