Pressure Transient Analysis for Two-Phase (Water/Steam) Geothermal Reservoirs
- 1 June 1980
- journal article
- Published by Society of Petroleum Engineers (SPE) in Society of Petroleum Engineers Journal
- Vol. 20 (03) , 206-214
- https://doi.org/10.2118/7479-pa
Abstract
A new diffusivity equation for two-phase (water/steam) flow in geothermal reservoirs is derived. The geothermal reservoir may be initially two-phase or may evolve into a two-phase system during production. Solutions of the diffusivity equation for a continuous line source are presented; the solutions imply that the plot of bottomhole pressure vs. log10t (t = time) should be a straight line. The slope of the straight line is inversely proportional to the total kinematic mobility. Comparison of the theory with a limited number of computer-simulated drawdown histories shows excellent agreement.Keywords
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