摘要
利用室内实验所采集的低频水力振动在岩心中传播的时域分析、频域分析、振幅在岩心中的变化以及相关的实验数据,定性分析了振幅在岩心中的传播规律,并建立了振幅衰减率在x传播方向上变化的基本模型,得出衰减系数与振源振幅的关系式。应用量纲分析和相似原理建立了相关参数的函数关系式,对数据进行分析回归得出系数A、B的表达式,推导出低频波在油层中衰减系数的预测模型。应用此数学模型计算了低频水力脉冲压力波在油层渗流条件下的有效作用距离,所得结果与油田实际情况基本吻合。
The transmission laws for the amplitude of low-frequency hydraulic vibration in the core were qualitatively analyzed by means of the time-domain analysis, frequency-domain analysis, variation of amplitude and related experimental data. A fundamental model for describing the amplitude decay rate varying in x transmission orientation was established, and a functional equation for expressing the attenuation coefficient and amplitude of vibration was obtained. Another functional expression of relative parameters was presented by the use of the unit analysis and the law of similarity. The functional equations of A and B were induced by processing and analyzing the data, and a forecasting model for the attenuation coefficient of the low-frequency wave in oil layer was deduced. The mathematical models were used to calculate the effective functioning distance of the low-frequency hydraulic pulse wave under the condition of fluid flow in oil layer. The simulation results agree well with the actual data of oil field.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2005年第6期90-92,共3页
Acta Petrolei Sinica
基金
国家重点基础研究发展规划(973)项目(2003CB214606)资助
关键词
油藏
低频波
振幅衰减率
衰减系数
数学模型
实验研究
oil reservoir
low-frequency wave
amplitude decay rate
attenuation coefficient
mathematic models experimental research
