Methods and compositions for reducing water production from subterranean formations
AssigneeHalliburton Energy Services, Inc.
InventorsMary Anne Hardy, O. Marlene Isenberg
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Abstract
The present invention relates to methods and compositions for reducing the production of water from water and oil producing subterranean formations. The methods basically comprise the introduction of an aqueous polymer composition into the water producing zones of the formation which cross-links after being placed therein. The compositions of the invention are comprised of a heavy brine and a graft copolymer of a hydrophilic polymer and a phosphonate.
Claims14
A method of reducing the production of formation water from a water producing subterranean zone comprising introducing into said zone an aqueous polymer composition which cross-links after being placed therein and contacting said formation water whereby water produced from said zone is substantially reduced, said composition being comprised of an aqueous salt solution and a graft copolymer of a hydrophilic polymer and a phosphonate.
A method of reducing the production of water from a water and oil producing subterranean formation comprising introducing an aqueous polymer composition into said formation which cross-links when it contacts formation water but does not cross-link when it contacts oil, said composition being comprised of heavy brine and a graft copolymer of hydroxyethylcellulose and vinyl phosphonate.
A method of reducing the production of water from a water and oil producing subterranean formation comprising the steps of:
- introducing an aqueous polymer composition into said formation which cross-links after dissolving alkaline formation materials and when it contacts formation water but does not cross-link when it contacts oil, said composition being comprised of calcium chloride-calcium bromide brine having a density of about 15.2 lb/gal and a graft copolymer of hydroxyethylcellulose and vinyl phosphonate present in said composition in an amount in the range of from about 0.36% to about 1.0% by weight of brine therein;
- and
- producing said formation so that said aqueous polymer composition cross-links in water producing zones in said formation thereby reducing the water production from said formation.
Dependencies are inferred from the claim text.