Abstract
BR21 is a “two-phase” well in Broadlands geothermal field, producing at excess enthalpy from a liquid-dominated reservoir. Detailed transient measurements were made, measuring the changes in mass flow, enthalpy, chemistry and pressure after the well was opened, and after later changes in flow. These results are interpreted in terms of possible models of heat and mass transfer in the reservoir near the well. It is found that there is a delayed thermal equilibrium which requires a fractured rather than a homogeneous porous medium model, and that variations in discharge chemistry did not distinguish between the possible models. An estimate of the steam saturation in the reservoir was obtained.
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