Study On Enhancing Oil Recovery Technology Of Carbon Dioxide Foam Steam Drive In Heavy Oil Reservoir

Steam drive is an agent technique in viscous oil recovery. Due to steam flooding and gravity override, the sweep efficiency of steam was decreased. Carbon dioxide foam steam drive can slowdown steam breakthrough, perform both profile modification and oil displacement, posses great potentialities.According to the problem of the development in the east of fuyu oilfield, physical modeling and numerical simulation technique were applied to the research on enhancing oil recovery of carbon dioxide foam steam drive. This work studied the adaptability of this technique to reservoir conditions, evaluated systemically the property of foam agent and carbon dioxide foam, and optimized gas-liquid ratio and foam agent concentration. Based on enhancing oil recovery experiment of carbon dioxide foam, the recovery mechanism was furthered. The reservoir engineering design of the pilot test region was optimized. All of the results above laid a foundation to the pilot test in the field. The main achievements of this innovative research are as follows:(1) Did a systemic research on the property of the foam agent and carbon dioxide foam, provided some basis to the injection parameters.(2) Through the new method, we studied the capability of improving the horizontal sweep efficiency, the experimental results showed: carbon dioxide foam had profile control effect on secondary water and high water-phase relative permeability formation, restrained fingering.(3) According to the characteristics of the east reservoir of fuyu oilfield, Carbon dioxide foam steam drive was first used to the pilot test region. Injection mode, injection parameters, well pattern and well spacing optimized in this paper laid a theory foundation to the field implement.The research result of this paper has reference and guidance function to field application, provides an effective developing technology for steam driving reservoir.