Application of polymer gels for profile modification and sweep improvement of gas flooding

Technical Report · Tue Dec 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/7149557· OSTI ID:7149557

Raible, C; Zhu, T

Early CO[sub 2] breakthrough can be a serious problem during miscible and immiscible CO[sub 2] flooding of reservoirs with heterogeneous formations. One potential method to reduce the problem of gas channeling is the use of a gel to restrict flow of fluids into the high-permeability zones. This study included evaluation of several different candidates for their potential as gelled polymer treatments for in situ profile modification. The objective of gel treatments is to restrict flow through fractures and high permeability zones without significantly damaging the adjacent oil productive zones. This involves injection of viscous polymer solution, hopefully into a high-permeability zone. In this study, layered sandpacks were used to show the effect of gelant mobility on gel penetration and placement. X-ray computerized tomography (CT) was used to visualize the flow path of the injected gelant and the location of gel placement. A conventional gel of xanthan and Cr(III) as a crosslinking agent was used for experimental model studies. The results of experimental model studies demonstrated the effects of viscous crossflow which may damage the oil productive strata. More specifically these studies of layered models showed that unless there is a very high-permeability contrast, such as a fractured zone, a considerable volume of viscous crossflow will occur with damage to oil productive strata. These results indicated the need for injection and placement of a low viscosity gelant prior to gelation.

• Research Organization: National Inst. for Petroleum and Energy Research, Bartlesville, OK (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-83FE60149
• OSTI ID: 7149557
• Report Number(s): NIPER-632; ON: DE93000106
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADDITIVES
BENCH-SCALE EXPERIMENTS
BRINES
CARBON DIOXIDE INJECTION
COLLOIDS
COMPUTERIZED TOMOGRAPHY
CONTROL
DATA
DIAGNOSTIC TECHNIQUES
DISPERSIONS
ENERGY SOURCES
ENHANCED RECOVERY
EXPERIMENTAL DATA
FLUID INJECTION
FOSSIL FUELS
FUELS
GELS
INFORMATION
MISCIBLE-PHASE DISPLACEMENT
MOBILITY
NUMERICAL DATA
OIL WELLS
PERFORMANCE TESTING
PERMEABILITY
PETROLEUM
POLYMERS
SAND
SWEEP EFFICIENCY
TESTING
TOMOGRAPHY
WELLS