Polyampholytes-high temperature polymers and method of use
This patent describes a method of fracturing a subterranean formation. It comprises: providing a polyampholyte that is the polymerization product of a mixture of monomers comprising at least one from each of the following groups: Group I: acrylamide (AM), partially hydrolyzed acrylamide, N,N-dimethylacrylamide, N-substituted-(N{prime}-dialkylaminoalkyl) acrylamides, aminoalkylacrylates, dialkylaminoalkylacrylates or mixtures thereof; Group II: 2-acrylamido-2-methylpropane sulfonic acid, sodium salt (AMPS), vinylphosphonic acid (VPA), partially hydrolyzed acrylamide or mixtures thereof; and methacrylamidopropyldimethyl-2,3-dihydroxypropyl ammonium sulfate (MAPDMDHPAS); provided that partially hydrolyzed acrylamide may be selected from Group I or Group II, but not both; inverting the polympholyte using a surfactant to form a viscous aqueous liquid; buffering the aqueous liquid with pH modifying substances; admixing the polyampholyte in aqueous liquid with a crosslinking agent injecting the fluid in a mixture with or without a particulate agent into the formation at a rate and pressure sufficient to fracture the formation.
- Assignee:
- Halliburton Co., Duncan, OK (USA)
- Patent Number(s):
- US 4959163; A
- Application Number:
- PPN: US s 7-267489
- OSTI ID:
- 6220518
- Resource Relation:
- Patent File Date: 3 Nov 1988
- Country of Publication:
- United States
- Language:
- English
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