Evaluation of methods of reducing permeability in porous media by in situ polymer treatments. Final report
Several processes have been developed to reduce the permeability of reservoir rocks using high-molecular-weight, water-soluble polymers. This report describes a study of two processes which are used commercially to cross link polyacrylamides. Both processes are based upon the controlled release of multivalent metal ions which form a ''crosslink'' of some form between polymers. The first process, called the ''chromium redox process'', consists of the displacement of a polymer slug containing chromium in the +6 oxidation state, followed by a slug of polymer containing a reducing agent. A reaction occurs when the two slugs mix with Cr(VI) being reduced to Cr(III). The Cr(III) reacts with the polymer to form a gel. The second process, called the combination process, consists of the sequential injection of slugs containing polymer, aluminum citrate and polymer followed by resumption of water injection. The research described in this report investigated these two methods of reducing the permeability of porous rocks using polyacrylamides. Research was conducted on properties of bulk gels as they formed as well as in situ gelation in sandpacks and Berea core material. The research was organized in six parts: (1) characterization of gel systems; (2) correlation of gelation times and process variables for chromium(III) systems; (3) kinetics of reactions involving reduction of chromium(VI); (4) rheological studies of gelling processes; (5) insitu gelation of chromium(III) systems; and (6) permeability reduction with alternate slugs of aluminum citrate and polymer. Progress reports in each of these areas are presented. 71 figs., 81 tabs.
- Research Organization:
- Kansas Univ., Lawrence (USA)
- DOE Contract Number:
- AS19-80BC10354
- OSTI ID:
- 6415576
- Report Number(s):
- DOE/BC/10354-16; ON: DE86000264
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM COMPOUNDS
GELATION
REDUCTION
DISPLACEMENT FLUIDS
GELS
RHEOLOGY
POLYAMIDES
SAND
PERMEABILITY
SANDSTONES
WATERFLOODING
ADDITIVES
BENCH-SCALE EXPERIMENTS
ALUMINIUM COMPOUNDS
CHEMICAL REACTION KINETICS
CITRATES
CROSS-LINKING
EXPERIMENTAL DATA
POROUS MATERIALS
CARBOXYLIC ACID SALTS
CHEMICAL REACTIONS
COLLOIDS
DATA
DISPERSIONS
FLUID INJECTION
FLUIDS
INFORMATION
KINETICS
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERIZATION
POLYMERS
REACTION KINETICS
ROCKS
SEDIMENTARY ROCKS
TRANSITION ELEMENT COMPOUNDS
020300* - Petroleum- Drilling & Production