Monitoring of Enhanced Oil Recovery Processing

日本九州大学地球物理实验室开发了一种监测三次采油过程的先进地电方法。在加拿大阿尔伯塔省阿萨巴斯卡省麦克默里堡汉金斯通试验场，九州大学、JAPEX和CANOS联合研究，应用流体流动层析成像法对注汽前、注汽期间和注汽后的流体流动行为进行了为期三个月的监测。利用个人计算机控制的自动记录系统，可以在操作井眼周围多达120个通道的多个测站以两秒的间隔同时测量带电电位和自然电位。通过绘制杭金斯通试验场第八次热力采油过程中剩余电位的等高线图和视电阻率分布的相对变化，将油砂层中的流体流动行为可视化为时间的函数。通过对自然极化数据和带电电位数据的三维反演，可以获得注入蒸汽、凝析水、油库和沥青的三维时间分布，通过数字滤波技术的数据处理从目前的流体流动层析成像方法获得的观测数据中分离出来。

An advanced geoelectric method for monitring EOR precess has been developed by the Geophysical Laboratory in Kyushu University, Japan. The 4D method named as Fluid Flow Tomography has been applied to monitor fluid-flow behaviors before steam injection, during injection and after steam injection for three months by the joint research works of Kyushu University, JAPEX and CANOS on the Hangingstone test site in Fort McMurray, Athabasca area, Alberta, Canada.With the automatic recording system controlled by a personal computer, charged potentials and spontaneous potentials can be simultameously measured with two seconds interval as a function of time at multiple stations up to 120 channels surrounding operating boreholes. Fluid-flow behaviors in the oil sand foramtion were visualized as a function of time by making contour maps of residual potentials derived from spontaneous polarization data and relative changes of apparent resistivity distributions during the 8th thermally enhanced oil recovery process on the Hangingstone test site.Three dimensional distributions of injected steam, condensed water, oil bank and bitumens could be imaged as a function of time by the 3D inversion of Spontaneous Polarization data and Charged Potential data separated by data processings of digital filtering techniques from the observed data obtained by the present Fluid Flow Tomography method.