Performance Evaluation and Microscopic Oil Displacement Effect of High-temperature and High-Pressure N2 Foam
In view of the poor stability and low oil displacement efficiency of conventional nitrogen foam under reservoir conditions,the high stability nitrogen foam system RTS-1 compounded with nano particles and foaming agent is optimized using a high-temperature and high-pressure foam evaluation device,and the effects of temperature,pressure,salinity and oil content on the performance of RTS-1 foam system were evaluated.The micro oil displacement effects of conventional foam system RT-1 and high stability foam system RTS-1 are compared.The results show that the nano particles can improve the stability of foam;As the temperature increases from 80℃to 120℃,the foaming performance and stability of the system RTS-1 decrease by 18.7%and 43.3%,respectively;the foam system RTS-1 has good salt resistance;As the pressure increased from 5 MPa to 20 MPa,the half-life of the foam increased by 54.3%;When the oil content of the system rises to 10%,the performance of foam decreases slightly,and the half-life only decreases by 12.3%,with a certain oil resistance.Micro oil displacement experiment shows that RTS-1 foam system has larger sweep area and higher oil washing efficiency than RT-1 foam system,and the oil recovery is increased by 10%.
N2 foamperformance evaluationmicroscopic oil displacementhigh temperature and high pressureenhanced oil recovery
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