Abstract
A flow-reversal method involving the injection and retrieval of fluid from a fractured, porous medium at a different temperature to that of the system in its undisturbed state is described and assessed as a potential technique for measuring the thermal transients of blocks of fractured porous media. Formulae are obtained for the zeroth- and first-order time moments of the thermal history of the fluid when it is well mixed in the injection-retrieval hole, injected at a temperature T 1 (different to the uniform temperature T 0 the undisturbed system) at a fixed rate Q, for a time t 1 , and then withdrawn through the same drill hole at the same fixed rate Q. These formulae have a potential for determining some geometric parameters of the block structure, including the block surface-to-volume ratio and the mean action time for conductive heating.
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