Nonisothermal effects during injection and fall-off tests
In this study numerical simulation of pressure transients during injection and fall-off tests are used to develop methods for obtaining the reservoir transmissivity and the skin value. A numerical simulator, PT (Pressure-Temperature), is used to simulate injection and falloff pressure transients. The results show that in the analysis of pressure data affected by a moving thermal front, the fluid properties corresponding to the temperature of the injected water must be used. On the other hand, in the analysis of fall-off tests, fluid properties corresponding to the reservoir fluids are appropriate. It is also shown that the application of conventional isothermal methods for calculating skin values from injection and fall-off data will give erroneous results. The authors present a new method for calculating skin values from injection and fall-off tests, that accurately corrects for nonisothermal effects. A number of detailed examples are given that illustrate the suggested method of analysis. Furthermore, it is applied to an injection test at the East Mesa Geothermal field in Southern California.
- Research Organization:
- Lawrence Berkeley Laboratory
- OSTI ID:
- 5448083
- Report Number(s):
- CONF-820927-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE11137; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150904* -- Geothermal Engineering-- Geothermal Reservoir & Well Performance
BOUNDARY LAYERS
CALCULATION METHODS
CALIFORNIA
DATA ANALYSIS
EAST MESA GEOTHERMAL FIELD
FEDERAL REGION IX
FLUID INJECTION
FLUIDS
FORMATION DAMAGE
GEOTHERMAL FIELDS
GEOTHERMAL FLUIDS
GEOTHERMAL WELLS
INJECTION WELLS
LAYERS
MASS TRANSFER
MATHEMATICAL MODELS
NORTH AMERICA
PRESSURE DEPENDENCE
PRESSURE DROP
RESERVOIR ROCK
TEMPERATURE EFFECTS
USA
WELLS