Abstract
The Cerro Prieto geothermal reservoir may be classified as a liquid-dominated system whose initial temperature and pressure conditions place it in the liquid-saturated region. In this field commercial power production began in 1973 and has continued since that date. Because of the inherent problems in applying pressure build-up tests to wells producing two-phase fluids, it was decided to use variable flow tests of short duration known as two-rate tests. In these tests a variation in the well flow rates can be used to interpret the transient pressure response in order to determine reservoir parameters such as permeability, well-bore damage and mean reservoir pressure in the well drainage area. Some examples will illustrate the application of this technique. Pressure drawdown tests have been planned in some of the wells in the field. On the other hand, a well interference test has been made in the southern part of the field using M-90, M-91, M-50 and M-51 as production wells and M-101 as an observation well. The interpretation of this test using curve-matching procedures is illustrated. In the future, several of these tests are planned which will take advantage of the wells being drilled in new areas of the field.
Published Version
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