Visualization and simulation of immiscible displacement in fractured systems using micromodels: Steam injection

Technical Report · Sat Jul 01 04:00:00 EDT 1995

DOI:https://doi.org/10.2172/87369· OSTI ID:87369

Yortsos, Y C

A study of steam and hot water injection processes in micromodel geometries that mimic a matrix-fracture system was undertaken. The followings were observed: Light components existing in the crude oil generated a very high efficient gas-drive at elevated temperatures. This gas generation in conjunction with natural surfactant existing in the crude oil, lead to the formation of a foam in the fracture and to improved displacement in the matrix. We observed that the steam enters the fracture and the matrix depending on whether the steam rate exceeds or not the critical values. The resulting condensed water also moves preferentially into the matrix or the fracture depending on the corresponding capillary number. Since steam is a non-wetting phase as a vapor, but becomes a wetting phase when condensed in a water-wet system, steam injection involves both drainage and imbibition. It was found that all of the oil trapped by the condensed water can be mobilized and recovered when in contact with steam. We also examined hot-water displacement. In comparison with cold-water experiments at the same capillary number, a higher sweep efficiency for both light and heavy oils was observed. It was found that the loam generated in the fracture during hot-water injection, is more stable than in steamflooding. Nonetheless, hot-water injection resulted into less efficient displacement in its absence.

• Research Organization: University of Southern California, Los Angeles, CA (United States). Dept. of Chemical Engineering
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-93BC14899
• OSTI ID: 87369
• Report Number(s): DOE/BC/14899--25; ON: DE95000150
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BENCH-SCALE EXPERIMENTS
ENHANCED RECOVERY
FLOW VISUALIZATION
FOAMS
FRACTURED RESERVOIRS
HOT-WATER PROCESSES
OIL WELLS
PETROLEUM
SIMULATION
STEAM INJECTION
SWEEP EFFICIENCY
WATERFLOODING