Decline curve analysis of vapor-dominated reservoirs

Conference · Thu May 01 04:00:00 EDT 1997

OSTI ID:484544

Faulder, D D

Geothermal Program activities at the INEEL include a review of the transient and pseudosteady state behavior of production wells in vapor-dominated systems with a focus on The Geysers field. The complicated history of development, infill drilling, injection, and declining turbine inlet pressures makes this field an ideal study area to test new techniques. The production response of a well can be divided into two distinct periods: transient flow followed by pseudo-steady state (depletion). The transient period can be analyzed using analytic equations, while the pseudo-steady state period is analyzed using empirical relationships. Yet by reviewing both periods, a great deal of insight can be gained about the well and reservoir. An example is presented where this approach is used to determine the permeability thickness product, kh, injection and production interference, and estimate the empirical Arps decline parameter b. When the production data is reinitialized (as may be required by interference effects), the kh determined from the new transient period is repeatable. This information can be used for well diagnostics, quantification of injection benefits, and the empirical estimation of remaining steam reserves.

• Research Organization: Idaho National Engineering Lab., Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: AC07-94ID13223
• OSTI ID: 484544
• Report Number(s): INEL/CON--97-00213; CONF-970376--5; ON: DE97052974
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
DATA COMPILATION
FLOW MODELS
FLUID FLOW
GEOTHERMAL ENERGY
GEYSERS GEOTHERMAL FIELD
Geothermal Legacy
RESERVES
RESOURCE DEVELOPMENT
VAPOR-DOMINATED SYSTEMS