An Integrated Test Program for the Definition of a High Temperature Geothermal Reservoir: A Case Study from the Zunil Geothermal Field, Guatemala
- Key words
- Reservoir Engineering; Production; Guatemala; Quetzaltenago; Zunil; Enthalpy; Excess Enthalpy; High Temperature; K; Permeability; Two Phase; Flow Tests; Interference Tests; James Russell Method; James Tube; Lip Pressure; PTA; Transmissivity; Storativity;
- Location
- Zunil, Guatemala
- Conference
- Geothermal Resources Council Transactions
- Year
- 1990
- Session
- Well testing; Flow testing; Interference testing
- Language
- English
Abstract
An extensive well test program was conducted at the Zunil geothermal field, Quetzaltenango, Guatemala during 1989 and involved all six (ZCQ-1 to -6) large diameter well drilled in the field during 1980-1981. The results indicated that two of the existing wells (ZCQ-5 and -5) have unstable discharges that require further testing or workovers to reduce the instability. If ZCQ-4 and 5 can maintain their present power capacity, the four production wells (ZCQ 3 to -6) would be capable of supplying the required steam flow rate for the proposed 15 MW power plant. Measured flow rate decline from the 1989 long term test and previous long term tests show, however, that additional wells be required to maintain production. Three new wells (ZD-) are planned to be drilled during 1990-1991 to provide the necessary additional capacity. Analysis of pressure buildup and interference tests give a transmissivity of 1,600 to 8,500 md.m, typical for high temperature geothermal fields. The interference test also indicates that the central wells (ZCQ 1, -3 and -4) are in good communication.
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