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US 4,784,694 AGranted
Compositions of polymer systems, and their use for example in hydraulic fracturing
AssigneeEtudes et Fabrication
InventorsRichard Lemanczyk, Jacques Desbrieres
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Abstract
The invention relates to the improvement by a chelating agent of polymer compositions usable in particular in the hydraulic fracturing of underground formations close to a drilling well. The chelating agent is a compound such as fumaric acid, maleic acid or thiourea. Substantially shorter crosslinking time; use possible even with sea water or a brine.
Claims17
Polymer based crosslinkable compositions for use in the state of crosslinked gels, in particular in the hydraulic fracturing of underground formations, of the type comprising:
- a base polymer
- a crosslinking agent
- an acid buffer, and
- a delayed base
- wherein said compositions further comprise a chelating agent selected from the compounds containing at least one --COOH group and thiourea, in a proportion of 2-10% by weight of the polymer.
2 more elements
Dependencies are inferred from the claim text.