The Basic Research Of Application Of The Low-frequency Aeroacoustic Wave In Heavy Oil Thermal Recovery

In recent decades, the technology of acoustic wave is widely used and developed inindustry of petroleum, which almost penetrates to all kinds of technologies of productionengineering and achieve better effect with its special effects on rock and fluids in the reservoir.In our country, reserves of heavy oil resources is very rich. At present, steam stimulation is themain technique in the production of heavy oil reservoir. With the increasement of soak cycle,the reservoir heterogeneity and the steam injection pressure increase and the effect becomespoor. For the problems that steam stimulation exposes, we hope to improve the effect with theaid of the sound waves and give full play to the synergistic effect of the low-frequencyacoustic wave and the steam injected. This topic is aimed at researching the propagationcharacteristics of low-frequency sound wave, the effect of removing formation damage andthe effect of reducing the viscosity and wished to provide foundation for later in-depth study.In the experiment of damage removal by low-frequency acoustic wave, mainly two kindsof low-frequency sound wave are chosen as the research object and the recovery of corepermeability as the criteria. We conclude the law of damage removal of the core bylow-frequency sound wave with the changes of parameters, such as frequency, combinationtype and time, baseed on the comparison analysis of experimental results.In the viscosity reduction experiment by low-frequency acoustic vibration, firstly westuty the factor that impacts the effect of viscosity reduction by low-frequency sound wave bychanging the single parameter, secondly, we choose the optimal parameter combination toachieve the best effects of viscosity reduction by using orthogonal design. Namely whenfrequency is114,5Hz, time is3min and temperature is50℃, the best result can be achieved.The role of removing the damage by low-frequency sound wave can ease the problemthat injection pressure is too high during heavy oil thermal recovery, its function on reducingviscosity and high temperature of steam can supplement each other and low-frequency sound wave can impact larger formation, so its combination with thermal recovery by steam isfeasible and worth further exploration.