Effect of permeability variation and mobility ratio on five-spot oil recovery performance calculations

Conference · Wed Jan 01 04:00:00 EST 1969 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5376114

Craig, Jr, F F

Correlations are available for predicting the injectivity and areal sweep efficiency of uniform permeability flooding patterns as a function of the mobility ratio between the injected fluid and the oil. In the present study, this has been extended to investigate the effect of mobility ratio on both the injectivity and sweep of stratified 5-spot patterns. The results indicate that for any permeability stratification, mobility ratio has a marked effect on oil recovery at injected fluid breakthrough at mobility ratios between 0.10 and 10. However, there is a decreased effect of mobility ratio on breakthrough recovery both above and below this range. This points out that decreasing the injected fluid (water) mobility would be expected to have little effect on sweep at breakthrough if the mobility ratio by conventional waterflooding is below about 0.1. However, injecting fluids of increased viscosity frequently can improve the oil displacement efficiency from the swept portion of the reservoir. In predicting the oil recovery performance of fluid injection operations, one frequently assumes that the reservoir is composed of a series of horizontal layers, each of uniform properties, continuous from well to well, and insulated from cross flow between layers. (11 refs.)

• Research Organization: Pan American Petr Corp
• OSTI ID: 5376114
• Report Number(s): CONF-690997-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE2652
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ENGINEERING
ENHANCED RECOVERY
FLUID INJECTION
OIL WELLS
PERMEABILITY
RECOVERY
RESERVOIR ENGINEERING
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
STRATIFICATION
VARIATIONS
WATERFLOODING
WELLS