Water Control Gel for High Temperature Geothermal Reservoir Using Hydrothermal Process of Hectorite.
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概要
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Hectorite is a smectite clay having an ideal composition of Na<SUB>0.33</SUB> (Mg<SUB>2.67</SUB>Li<SUB>0.33</SUB>) Si<SUB>4</SUB>O<SUB>10</SUB> (OH) <SUB>2</SUB>·<I>n</I>H<SUB>2</SUB>O, which has been used as an effective colloidal dispersion system due to its favorable rheological properties.<BR>When amorphous slurry comprising approximately 2-5 weight % of hectorite composition, which is prepared from sulfuric-acid solved water glass mixed with aqueous solutions of MgC1<SUB>2</SUB>, LiOH and NaOH, is hydrothermally treated at 150-350°C conditions for 1-2 hour, viscous hectorite gel is formed above 200°C: the process may be applicable to water control of flowing and/or plugging in the geothermal reservoir fractures. Laboratory test for a water control system has been carried out using a simulator, a newly designed thermal gradient-type reactor. The results are satisfied: the flow path between the granite fragments filled in the reactor is plugged with hectorite gel formed by hydrothermal process of amorphous slurry comprising 2 weight % of hectorite compositon at 200°C and 250°C conditions.<BR>Such gel material for the underground high temperature conditions may be useful to make design of extracting huge geothermal energy through artificial fractures developed in the hot dry rock.
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