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Cold water injection into single‐ and two‐phase geothermal reservoirs
Author(s) -
Garg S. K.,
Pritchett J. W.
Publication year - 1990
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr026i002p00331
Subject(s) - geothermal gradient , petroleum engineering , phase (matter) , water injection (oil production) , porous medium , viscosity , geology , mechanics , injection well , transient (computer programming) , geotechnical engineering , porosity , thermodynamics , chemistry , physics , geophysics , organic chemistry , computer science , operating system
Approximate analytical solutions are derived for cold water injection into single‐ and two‐phase “porous medium” geothermal reservoirs. A numerical geothermal reservoir simulator is used to verify the applicability of the analytical solutions for pressure transient analysis. In accordance with these numerical results the analytical solutions indicate that the pressure buildup behavior during injection into either a single‐phase liquid or two‐phase reservoir is governed by the kinematic viscosity of the cold injected fluid. The falloff pressures after cold water injection into a single‐phase liquid reservoir (except for very early shut‐in times) are primarily controlled by the kinematic viscosity of the in situ (hot) reservoir fluid. For two‐phase reservoirs, however, the falloff behavior is considerably more complex and cannot be fully described by the analytical solution developed in this paper.