Abstract Successful drilling of geothermal wells into fractured hot rock through which geothermal fluid flows is critical to ensure efficient operation of geothermal power plants. This study focuses on investigating a casing-to-casing resistance method for estimating fracture connectivity between wells at Reykjanes geothermal reservoir in Iceland to better understand the fluid-flow in the reservoir. Conductive well casings were successfully used as electrodes to transfer the electric current deeper into the fractured reservoir in an electrical resistance survey. The low resistance measured between wells implies that the wells are connected to the main production zone at Reykjanes and that the current is travelling through fractures filled with conductive geothermal brine from one well casing to another rather than going through a less conductive rock. The measured resistance is compared to an analytical study showing the promising potential the casing-to-casing resistance method has for gaining valuable information about the fracture connectivity in geothermal reservoirs.

中文翻译：

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在冰岛雷克雅内斯地热田进行的套管对套管阻力研究，以估计裂缝连通性

摘要 成功地将地热井钻入地热流体流经的裂隙热岩中对于确保地热发电厂的有效运行至关重要。本研究的重点是研究用于估算冰岛雷克雅内斯地热储层井间裂缝连通性的套管到套管阻力方法，以更好地了解储层中的流体流动。在电阻测量中，导电井套管被成功用作电极以将电流更深地传输到裂缝性储层中。井间测得的低电阻意味着这些井与雷克雅内斯的主要生产区相连，并且电流通过充满导电地热盐水的裂缝从一个井套管流向另一井套管，而不是通过导电性较差的岩石。将测得的阻力与一项分析研究进行比较，该研究表明套管对套管阻力方法具有获得有关地热储层裂缝连通性的有价值信息的潜力。