A New Method For The Analysis Of The Phase State Characteristics Of The Tarim Near Critical Volatile Oil Reservoir

In this paper,using the laboratory evaluation experiment and phase simulation technology,the mutual solubility and miscibility of the injection super critical carbon dioxide and the formation reverse condensate oil and gas system in the late development of condensate gas reservoir development are carried out by the laboratory evaluation experiment and the phase simulation technology,and the reverse condensate of the condensate gas field in the condensate gas field is injected by the supercritical carbon dioxide flooding.The experimental evaluation of the minimum miscibility pressure of oil,the diffusion diffusion of supercritical carbon dioxide,the percolation characteristics of the long core carbon dioxide displacement reverse condensate and the oil displacement efficiency.The natural gas mixing mechanism of supercritical carbon dioxide displacement condensate gas reservoir is explored,and a new method to evaluate the recovery of condensate oil recovery by the injection of supercritical carbon dioxide in condensate gas reservoir is perfected,and the thermodynamic parameter field is provided for the numerical simulation of the injection of super critical carbon dioxide in the jakaka condensate gas field.In order to carry out the study on the percolation mechanism of supercritical carbon dioxide displacement condensate gas,a multi component seepage model is set up,and the experimental basis of the characteristics of the fluid phase state is provided to describe the characteristics of the supercritical carbon dioxide flooding for condensate gas seepage.Through the above research,we get the following results and understanding:(1)as the temperature is the same,the amount of reverse condensate is gradually increased with the pressure decreasing,and the amount of injection gas increases continuously when the pressure phase is at the same time.With the increase of the injected gas,the amount of reverse condensate decreases continuously,and the amount of reverse condensate is gradually slowed down with the increase of the injection gas.(2)the leading edge of the supercritical carbon dioxide displacement can remain relatively stable.Between the critical carbon dioxide and the condensate gas,only a small leading edge transition zone is formed,and the efficiency of the supercritical carbon dioxide displacement condensate gas can reach more than 95%.The feasibility of the supercritical C02 flooding for condensate oil and gas is verified.(3)the relative volume of carbon dioxide condensate gas is inversely proportional to the pressure.Under low pressure,the relative volume is proportional to the molar content of carbon dioxide,and it will increase with the increase.When the pressure is the same,the molar content of carbon dioxide will directly affect the relative volume.