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Papers by Vidar Haugse
Proceedings of SPE Annual Technical Conference and Exhibition, 2007
The purpose of the three experiments described in this paper was to investigate gas injection in ... more The purpose of the three experiments described in this paper was to investigate gas injection in
fractured carbonate reservoirs, focusing on the effect of capillary continuity, re-pressurization by
equilibrium gas, and injection of non-equilibrium gases. A composite core made from carbonate
core material from a Middle East reservoir was placed vertically in a core holder with free space
in the annulus between core and cell body. The core was saturated with oil phase and surrounded
by gas. Synthetic fluid systems consisting of C1, C3, and nC10 were used. Pressure and
temperature were selected to give proper IFT vs. capillary pressure and block height.
Series of gas injections were performed on the composite core as a single block, with all
plugs in capillary contact, and with two types of barriers in the middle of the composite
core, establishing two blocks. Experimental data from the study include oil and gas
production data, and gamma attenuation in-situ saturation profiles. Capillary pressure and
relative permeabilities were measured on plugs similar to those used in the composite
core.
The experiments showed a significant effect of increasing the pressure from 200 to 240
bars, especially for the two block configuration. The oil recoveries from equilibrium gas
injection with a barrier in the core were significantly lower than in the experiment with
all plugs in contact. An experiment with a thin, perforated barrier gave similar poor oil
recovery as with a thick barrier, indicating poor capillary contact in both cases. Injection
of a rich non-equilibrium gas recovered almost 100 % of the oil, whilst injection of lean
non-equilibrium gas also improved the oil recovery.
A compositional reservoir simulation model was set up to simulate the experiments. The
simulation model gave a good match of the experimental results after history matching.
Proceedings of SPE Annual Technical Conference and Exhibition, 2007
The purpose of the three experiments described in this paper was to investigate gas injection in ... more The purpose of the three experiments described in this paper was to investigate gas injection in
fractured carbonate reservoirs, focusing on the effect of capillary continuity, re-pressurization by
equilibrium gas, and injection of non-equilibrium gases. A composite core made from carbonate
core material from a Middle East reservoir was placed vertically in a core holder with free space
in the annulus between core and cell body. The core was saturated with oil phase and surrounded
by gas. Synthetic fluid systems consisting of C1, C3, and nC10 were used. Pressure and
temperature were selected to give proper IFT vs. capillary pressure and block height.
Series of gas injections were performed on the composite core as a single block, with all
plugs in capillary contact, and with two types of barriers in the middle of the composite
core, establishing two blocks. Experimental data from the study include oil and gas
production data, and gamma attenuation in-situ saturation profiles. Capillary pressure and
relative permeabilities were measured on plugs similar to those used in the composite
core.
The experiments showed a significant effect of increasing the pressure from 200 to 240
bars, especially for the two block configuration. The oil recoveries from equilibrium gas
injection with a barrier in the core were significantly lower than in the experiment with
all plugs in contact. An experiment with a thin, perforated barrier gave similar poor oil
recovery as with a thick barrier, indicating poor capillary contact in both cases. Injection
of a rich non-equilibrium gas recovered almost 100 % of the oil, whilst injection of lean
non-equilibrium gas also improved the oil recovery.
A compositional reservoir simulation model was set up to simulate the experiments. The
simulation model gave a good match of the experimental results after history matching.