Pressure Transient Analysis for Two‐Phase Geothermal Wells: Some Numerical Results

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Abstract
A numerical geothermal reservoir simulator is used in a series of calculations to help devise interpretation techniques for analyzing pressure transient data from two phase geothermal reservoirs. The investigations include (1) the drawdown/buildup behavior of initially two‐phase (liquid water/steam) reservoirs, (2) the drawdown/buildup response of initially single‐phase reservoirs which undergo flashing as a result of fluid production, and (3) the effects of cold water injection into hot two‐phase reservoirs. Production (drawdown/buildup) data from two‐phase (either initially or due to production‐induced boiling) reservoirs may be analyzed in the usual manner to yield kinematic mobility; buildup data from reservoirs which undergo flashing on production also offer the possibility of determining absolute formation permeability. Injection data can be interpreted in a straightforward manner to yield absolute formation permeability; the corresponding falloff data appear, however, to be of little value.