✍ Scribed by Zhenzi Jing; Kimio Watanabe; Jonathan Willis-Richards; Toshiyuki Hashida
No coin nor oath required. For personal study only.
A three-dimensional (3-D) water/rock chemical interaction model has been developed to examine the eect of water/rock chemical interaction (WRCI) on the long-term performance of hot dry rock and hot wet rock (HDR/HWR) reservoirs. The model, which integrates many ®eld observations and thus generates a fracture network very similar to the natural fracture distribution in the reservoir, can predict the in¯uence of WRCI on the overall fractured reservoir. Factors aecting WRCI and the eect of WRCI on long-term performance of Hijiori deep reservoir (Japan) have been modelled. Simulated results show that ¯uid chemistry, initial rock temperature, magnitude of ¯ow rate and well spacing have a major eect on WRCI, and for such a multi-well Hijiori geothermal system, WRCI seems to make the ¯ow distribution tend towards uniformity. The model described deals solely with chemical interactions as a function of ¯ow rate and temperature, and takes no account of aperture variation as a result of thermoelastic eects. It is only a partial model, though it could form an important module of a coupled model.
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