公开(公告)号：US20160259085A1

公开(公告)日：2016-09-08

申请号：US14422464

申请日：2014-02-28

申请人： HALLIBURTON ENERGY SERVICES, INC.

发明人： Glenn Andrew WILSON ,  Burkay DONDERICI ,  Etiene M. SAMSON ,  Tasneem A. MANDVIWALA ,  Ahmed FOUDA

IPC分类号： G01V11/00 ,  G01V3/30 ,  E21B47/12 ,  E21B33/14 ,  E21B47/10

CPC分类号： G01V11/002 ,  E21B33/14 ,  E21B47/10 ,  E21B47/123 ,  G01V3/30

摘要： Permanent electromagnetic (EM) monitoring of the regions around and between wells may employ a casing string positioned within a borehole through the subsurface formations of interest. At least two passivated electrodes are mounted on the casing string to sense electric fields in the formation. Though only capacitively coupled to the formation, the passivated electrodes nevertheless provide a potential difference to an electro-optical transducer, which in turn modifies a property of the light passing along an optical fiber attached to the casing string. An interface unit senses the modified property to derive a measure of the electric field between each pair of passivated electrodes. The passivated electrodes have a contact surface that is conductive but for one or more layers of non-reactive (and thus electrically insulating) materials. Illustrative materials include metal oxides, polymers and ceramics, but the layers are preferably kept very thin to maximize the coupling capacitance with the formation.

摘要翻译： 井周围和区域之间的区域的永久电磁（EM）监测可以采用位于钻孔内的套管柱，通过感兴趣的地下地层。 至少两个钝化电极安装在套管柱上以感测地层中的电场。 虽然仅电容耦合到地层，但是钝化电极仍然向电光换能器提供电位差，这又改变沿着连接到套管柱的光纤通过的光的性质。 接口单元感测修改的特性以导出每对钝化电极之间的电场的测量。 钝化的电极具有导电的接触表面，但是对于一个或多个非反应（且因此电绝缘）材料层。 示例性材料包括金属氧化物，聚合物和陶瓷，但是这些层优选地保持非常薄以使与地层的耦合电容最大化。