Method for imparting selectivity to polymeric gel systems
This patent describes a method for imparting selectivity to an in-situ gel-forming composition for placement within a subterranean oil-bearing formation having relatively high permeability zones and relatively low permeability zones. It comprises: preparing an aqueous-based mixture comprising: a first stage gel-forming composition; at least one second stage in-situ gel-forming composition comprising a water-dispersible polymer and a crosslinking agent for the water-dispersible polymer in an amount effective to form a stable gel; and gelling the first stage gel-forming composition exsitu by reacting the Xanthomonas campestris NCIB 1185 heteropolysaccharide with the crosslinking agent for the heteropolysaccharide; wherein the mixture exhibits greater selectivity than would a like mixture in the absence of the first stage selective gel-forming composition.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (United States)
- Patent Number(s):
- US 5156214; A
- Application Number:
- PPN: US 7-628042
- OSTI ID:
- 7053027
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
023000 -- Petroleum-- Properties & Composition
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360602 -- Other Materials-- Structure & Phase Studies
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COLLOIDS
DISPERSIONS
DRILLING FLUIDS
ENHANCED RECOVERY
FLUID INJECTION PROCESSES
FLUIDS
GELS
OIL WELLS
POLYMERS
STIMULATION
SYNTHESIS
WELL STIMULATION
WELLS