机械振动影响岩心渗透率的实验研究

振动增产是一项处理大面积油藏的新技术.本文叙述的一系列实验是其增产机理实验研究的一部分.对32块天然露头砂岩岩心、油田砂岩岩心及含束缚水的岩心进行了机械振动实验,观察了振动频率、强度对岩心渗透率的影响.实验表明,在岩心固有频率附近进行振动,会较大地提高岩心渗透率,天然露头砂岩岩心最大可提高27.8%,含束缚水的岩心最大可提高一倍.但频率不合适,反而会使岩心渗透率下降,岩心渗透率对振动强度不敏感,而是在0.05g～0.02g范围内才对其有较大影响.岩心的方向变化,其振动结果相近.

Experiments on the Effects of Mechanical Vibration on Core Permeability

:The paper introduces a series of experiments on the effects of mechanical vibration on core permeability. In the experiments, 32 cores were used which includedd naturally exposed sandstone cores,oil field sandstone cores and cores with bound water. The effects of vibration frequency and strength on the core permeability were observed. The results showed that when the vibration frequency was close to the core's eigen-fre-quency,the core's permeability was greatly improved. For the naturally exposed sandstone cores,the maximum value of raised permeability reached 27. 8%. For the sandstone cores with bound water,the value of permeability raised was doubled. But if the frequency did not fit,the permeability was lowered down. The core permeability was not sensitive to the vibration strength. But when the strength was in the range of 0.05g~0.2g, the permeability was affected to a certain degree. When the direction of the core changed,the results were almost the same.