APPARATUS FOR ACCUMULATING HEAT IN AQUIFER AND FOR PREVENTING GROUND FROM SUBSIDING AND METHOD FOR CONTROLLING SUBTERRANEAN WATER

摘要

PURPOSE:To prevent hot water and cooling water in an aquifer from flowing out and the ground from subsiding, by providing a partial aquifer with pumping-up wells, injection wells, an observation well, and a space well, providing a heat exchanger to the bottom part and intermediate part of each of the wells, and circulating a heat transfer medium through each of the heat exchangers. CONSTITUTION:The bottom part of each of the injection wells 3, 3', pumping-up wells 6, 6', the observation well 7, or the spare well 8 is provided with the heat exchanger, and after a heat transfer medium is injected via conduits, it is recovered so that the heat exchangers are provided with heat in a circulating manner. Thus in the case of hot water, the minimum water temperature of the aquifer 2 can be raised to 120 deg.C or above. In this case, if the bottom part of the pumping-up 6 is provided with the heat exchanger 9 and a heat transfer medium is injected and circulated, pumping-up is not required. Thus, as the water temperature of the aquifer is elevated, the pressure of the bubbles in the injected water at the injection well bottom part rises, the bubbles are eliminated and at the same time the surface tension of the water on the gravel and the viscosity of the water decrease thereby preventing the clogging. Therefore, the water permeability becomes high, and water leakage from the upper aquifer 2 comprising a heat storage layer to the lower aquifer 2' comprising a cooling layer increases thereby preventing the ground level from subsiding.