Patent · US Expired

Water soluble copolymers for use in fracture-acidizing of wells

US4500437A · kind A · utility

35Cited by

25References

9Claims

0Family size

Assignees

Cassella Aktiengesellschaft · DE
Dresser Industries, Inc. · US

Inventors

Friedrich Engelhardt · Frankfurt, DE
Klaus Kuhlein · Kelkheim, DE
Ulrich Riegel · Landstuhl, DE
Sigmar-Peter von Halasz · Kelkheim, DE
Jeffery C. Dawson · Katy, US
Anthony R. Reed · Houston, US

Key dates

Filing date	Sep 23, 1982
Grant date	Feb 19, 1985
Priority date	—
Expiry date	Sep 23, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/0391
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino functionality and at least 10% by weight of entities containing an amino carbonyl functionality, which are stable in high concentrations of Bronsted-Lowery acids and can be used as friction reducers in the stimulation of oil or gas wells.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.