Injection and energy recovery in fractured geothermal reservoirs

Journal Article · Mon Apr 01 04:00:00 EST 1985 · SPEJ, Soc. Pet. Eng. J.; (United States)

DOI:https://doi.org/10.2118/11689-PA· OSTI ID:6352634

Bodvarsson, G S; O'Sullivan, M J; Pruess, K

Numerical studies of the effects of injection on the behavior of production wells completed in fractured twophase geothermal reservoirs are presented. In these studies the multiple-interacting-continua (MINC) method is employed for the modeling of idealized fractured reservoirs. Simulations are carried out for a five-spot well pattern with various well spacings, fracture spacings, and injection fractions. The production rates from the wells are calculated using a deliverability model. The results of the studies show that injection into two-phase fractured reservoirs increases flow rates and decreases enthalpies of producing wells. These two effects offset each other so that injection tends to have small effects on the usable energy output of production wells in the short term. However, if a sufficiently large fraction of the produced fluids is injected, the fracture system may become liquidfilled and an increased steam rate is obtained. Our studies show that injection greatly increases the long-term energy output from wells because it helps extract heat from the reservoir rocks. If a high fraction of the produced fluids is injected, the ultimate energy recovery will increase many-fold.

• Research Organization: Lawrence Berkeley Laboratory
• OSTI ID: 6352634
• Journal Information: SPEJ, Soc. Pet. Eng. J.; (United States), Journal Name: SPEJ, Soc. Pet. Eng. J.; (United States) Vol. 25:2; ISSN SSPJD
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150904* -- Geothermal Engineering-- Geothermal Reservoir & Well Performance
COMPUTERIZED SIMULATION
ENGINEERING
ENHANCED RECOVERY
FLUID INJECTION
FRACTURED RESERVOIRS
GEOTHERMAL WELLS
PERFORMANCE
PRODUCTIVITY
RECOVERY
RESERVOIR ENGINEERING
SIMULATION
STIMULATION
WELL STIMULATION
WELLS