Nonisothermal effects during injection and falloff tests
Numerically simulated pressure transients during injection and falloff tests are analyzed to develop methods for obtaining the correct permeability/thickness of the reservoir and the skin factor for the well. The results show that to analyze correctly the pressure transients governed by a moving thermal front, the fluid-property values must correspond to the temperature of the injected fluid. For pressure falloff tests and for injection tests conducted in a well cooled by previous injection of drilling, however, the physical properties of the in-situ reservoir fluids must be used. The application of conventional isothermal methods for calculating skin values from injection and falloff data will give erroneous results. A new method is presented for calculating skin values from injection and falloff data that accurately corrects for nonisothermal effects. Examples are given to illustrate this analysis method. The technique is applied to the analysis of injection test data from a well located in the East Mesa geothermal field in southern California.
- Research Organization:
- Lawrence Berkeley Labs.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5293747
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Format. Eval.; (United States) Vol. 1:1; ISSN SFEVE
- Country of Publication:
- United States
- Language:
- English
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Nonisothermal effects during injection and fall-off tests
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Related Subjects
150904* -- Geothermal Engineering-- Geothermal Reservoir & Well Performance
CALCULATION METHODS
CALIFORNIA
COOLING
DIMENSIONS
DRILLING
EAST MESA GEOTHERMAL FIELD
FEDERAL REGION IX
FLUIDS
FORMATION DAMAGE
GEOTHERMAL FIELDS
GEOTHERMAL WELLS
MATHEMATICAL MODELS
NORTH AMERICA
PERMEABILITY
PHYSICAL PROPERTIES
PRESSURE DROP
PRESSURE EFFECTS
PRESSURIZING
RESERVOIR FLUIDS
TEMPERATURE DEPENDENCE
THICKNESS
TRANSIENTS
USA
WELL DRILLING
WELLS