Analysis of Production Decline in Geothermal Reservoirs

Technical Report · Mon Sep 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/6765221· OSTI ID:6765221

Byrns, R

Data and analysis methods were gathered from the petroleum, geothermal, and hydrological literature. The data sets examined include: Wairakei, New Zealand -141 wells; Cerro Prieto, Mexico - 18 wells; The Geysers, USA - 27 wells; Larderello, Italy - 9 wells and groups; Matsukawa and Otake, Japan - 8 wells; and Olkaria, Kenya - 1 well. The analysis methods tested were; Arps's equations, Fetkovich type curves, Slider's method for Arps, Gentry's method for Arps, Gentry's and McCray's method, other type curves, P/z vs. Q method, Coats' influence function method, and Bodvarsson's Linearized Free Surface Green's Function method. The conclusions are: (1) The exponential equation fit is satisfactory for geothermal data. (2) The hyperbolic equation should be used only if the data fit well on a hyperbolic type curve. (3) The type curve methods are useful if the data are not too scattered. They work well for vapor dominated systems and poorly for liquid dominated systems. (4) Coats' influence function method can be used even with very scattered data. (5) Bodvarsson's method is still experimental but it shows much promise as a useful tool.

• Research Organization: Zais (Elliot) and Associates, Inc., Corvallis, OR (USA); Oregon State Univ., Corvallis (USA). School of Oceanography
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6765221
• Report Number(s): LBL-11215; GREMP-10
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150904* -- Geothermal Engineering-- Geothermal Reservoir & Well Performance
AFRICA
CALCULATION METHODS
CERRO PRIETO GEOTHERMAL FIELD
COMPRESSIBILITY
COMPUTER CODES
DATA ANALYSIS
DEVELOPING COUNTRIES
DRAWDOWN
ENGINEERING
EQUATIONS
FLOW RATE
GEOTHERMAL FIELDS
GEOTHERMAL SYSTEMS
GEOTHERMAL WELLS
GEYSERS GEOTHERMAL FIELD
Geothermal Legacy
HYDROTHERMAL SYSTEMS
KENYA
LARDERELLO GEOTHERMAL FIELD
MATHEMATICAL MODELS
MATSUKAWA GEOTHERMAL FIELD
MECHANICAL PROPERTIES
OTAKE GEOTHERMAL FIELD
PERFORMANCE
PRODUCTION
RESERVOIR ENGINEERING
S CODES
WAIRAKEI GEOTHERMAL FIELD
WELLS