Hydrosoluble silane or siloxane derivative-based copolymer

Details Hydrosoluble silane or siloxane derivative-based copolymer Hydrosoluble silane or siloxane derivative-based copolymer

1998-08-04

2001-06-26

Warden, Jill (Department: 1743)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S926000, C556S450000

Reexamination Certificate

active

06251837

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to new associating hydrosoluble polymers intended for various applications, for example well fluids, paints, the cosmetics industry, the paper industry. Associating polymers consist of a hydrosoluble skeleton comprising a small amount of hydrophobic groups. They are mainly used as thickening agents for rheology control of aqueous suspensions. The polymers according to the present invention have shown very interesting properties as viscosifiers and, furthermore, an adsorption power that permits the contemplation of other applications, for example as filtrate reducer, swelling inhibitor or argillaceous rock cleavage inhibitor, or for cuttings dispersion control.
It is well-known that hydrophobic monomers generally consist of a hydrocarbon or perfluorocarbon chain. The copolymers of the present invention are made of a hydrophilic monomer of acrylamide type for example and of a silane or siloxane derivative-based hydrophobic monomer. The temperature stability of the siloxane bonds should favour the thermal stability in solution of the copolymer of the present invention.
SUMMARY OF THE INVENTION
The present invention thus relates to a hydrosoluble copolymer obtained from hydrophilic monomers and hydrophobic monomers having at least one of the following general formula structures a, b or c:
The proportion of hydrophobic monomer is less than 10 % by mole.
In the copolymer, the hydrophobic monomer can have the following general formula:
According to the invention, the hydrophobic monomers can be acrylamide.
The copolymer according to the invention can be obtained by means of a radical, for example micellar copolymerization process.
In the micellar copolymerization process, dodecyl sodium sulfate can be used as surfactant.
The copolymer according to the invention can also be obtained by heterogeneous copolymerization.
The copolymer can have a molecular weight substantially ranging between 10
4
and 5·10
6
.
In a variant, the copolymer can have a molecular weight substantially ranging between 5·10
5
and 5·10
6
, and have at most 2% by mole of hydrophobic monomers.
In another variant, the copolymer can have a molecular weight substantially ranging between 10
4
and 10
6
, and have from 2% to 10% by mole of hydrophobic monomers.
The copolymer can be dissolved in aqueous fluids in a proportion ranging between 0.1 and 15% by weight, said fluids being used in circulation in a wellbore, for example as drilling fluids, completion or workover fluids, fracturing, sweep fluids, or cement slurry.
The invention also relates to an application of the copolymer for rheology control of an aqueous fluid.


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