Reducing permeability of highly permeable zones in underground formations

Patent · Tue Sep 27 04:00:00 EDT 1988

OSTI ID:6688329

Allison, J D; Purkaple, J D

This patent describes a process for reducing flow into a porous thief zone penetrated by a water injection well bore which comprises injecting down the well bore and into the porous thief zone a mixture of an aqueous solution of a water soluble polymer selected from the group consisting of polyalkylenimines, polyalkylenepolyamines and mixtures thereof and an anionic or hydrolyzable nonionic polymer capable of delayed cross-linking with the water soluble polymer whereby delayed indepth gelling of the water soluble polymer takes place in the formation. The anionic or nonionic polymer are selected from the group consisting of polyacrylamide and alkylpolyacrylamides, copolymers of polyacrylamide and alkylpolyacrylamides with ethylene, propylene and styrene, polymaleic anhydride and polymetahcrylate and hydrolysis products thereof.

• Assignee: Conoco Inc., Ponca City, OK
• Patent Number(s): US 4773481
• OSTI ID: 6688329
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALKENES
ALKYL RADICALS
ALKYLATED AROMATICS
AMIDES
AMINES
ANHYDRIDES
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPOLYMERS
CROSS-LINKING
DICARBOXYLIC ACIDS
ESTERS
ETHYLENE
FLUID INJECTION
HYDROCARBONS
MALEIC ACID
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PERMEABILITY
PLUGGING
PLUGGING AGENTS
POLYACRYLATES
POLYMERIZATION
POLYMERS
POLYVINYLS
PROPYLENE
RADICALS
RESERVOIR ROCK
STIMULATION
STYRENE
WATERFLOODING
WELL STIMULATION
WELLS