Tohoku Univ. Technology：Selective Flow Control in Geothermal Reservoirs via Short-Circuit Mitigation：T25-069
Temperature-Responsive Gel for Preferential Fracture Plugging
Geothermal energy is recovered by injecting fluid through injection wells, allowing it to absorb heat as it flows through rock fractures, and extracting the heated fluid via production wells. Preferential flow through highly permeable fractures can cause short-circuiting, where injected fluid reaches the production well without sufficient heat exchange, reducing power generation efficiency. Currently, no effective method exists to mitigate short-circuiting, and operators are limited to temporary measures such as adjusting injection rates or switching wells. The inventors have identified a potential solution using a temperature-responsive gel that solidifies at high temperatures. When injected, the gel slurry flows into preferential flow channels and selectively plugs them upon reaching the high-temperature reservoir zone, redistributing fluid flow to other fractures and improving heat recovery efficiency.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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