The Influence of Acoustic Vibrations Parameters on Permeability of Rocks
摘要
The research focuses on using acoustic vibrations technology to restore permeability of rocks affected by deterioration. Laboratory studies demonstrated the effectiveness of this technology in mobilizing paraffins. A laboratory rig was used to show the effect of paraffin mobilization in rock samples under acoustic vibrations during fluid filtration. The study simulated pressure gradients in the sample to model formation depression, allowing for the observation of elastic oscillation effects on paraffin particles blocking pores. Results showed that the relative displacement caused by acoustic vibrations broke up paraffin corks, increasing permeability. The effectiveness of treatment was determined by the permeability ratio before and after treatment. A model was developed to describe how the change in frequency of acoustic vibrations affects this ratio. The study also revealed the additional extraction of residual oil from rock in the presence of a water phase due to acoustic vibrations. It was found that acoustic vibrations did not affect rock matrix permeability when the filtering fluid did not contain paraffin particles. Key innovations include establishing the influence of acoustic vibration frequency on rock permeability and discovering a resonance effect. The methodology developed for laboratory studies allows for determining the natural frequency of the matrix-oil-paraffin system. This resonant effect can be utilized to enhance acoustic treatments in low-rate wells, offering significant technological contributions to the field. The study was supported by the Russian Science Foundation (Project No. 22–19-00,447, https://rscf.ru/project/22-19-00447/ ) and provides valuable insights into improving reservoir filtration characteristics through acoustic vibrations technology.