US 5,110,486 AGranted

Breaker chemical encapsulated with a crosslinked elastomer coating

AssigneeExxon Research & Engineering Co.

InventorsPacifico V. Manalastas, Evelyn N. Drake, Edward N. Kresge, Warren A. Thaler, Lee A. McDougall, John C. Newlove, Vijay Swarup, Albert J. Geiger

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Abstract

An encapsulated breaker chemical composition used in an oil or gas stimulation operation which comprises: a breaker chemical; and a pinhole free coating of an ionically and covalently crosslinked neutralized sulfonated elastomeric polyer of about 2 to about 80 microns thick deposited onto the surface of the breaker chemical, wherein said polymer encapsulates the breaker chemical, wherein the polymer is permeable to the breaker chemical and the polymer is non-reactive to the breaker chemical.

Claims24

Dependent claims

An encapsulated breaker chemical composition used in an oil or gas operation which comprises:

(a) a solid particulate breaker chemical;
and
(b) a coating substantially free of pinholes comprising an ionically and covalently crosslinked neutralized sulfonated elastomeric polymer having a thickness of at least about 1 micron deposited onto the surface of particles of said breaker chemical, wherein said crosslinked neutralized sulfonated polymer encapsulates said breaker chemical, wherein said crosslinked neutralized sulfonated polymer is essentially impermeable to said breaker chemical under conditions of use and said crosslinked neutralized sulfonated polymer is non-reactive to said breaker chemical.

Dependencies are inferred from the claim text.

Facts

Application: 07/676,662Filed 28 Mar 1991 · continuation in part
Priority: 4 Dec 1989
Granted: 5 May 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

C09K 8/92
Compositions for stimulating production by acting on the underground formation: characterised by their form or by the form of their components,…
C09K 8/62
Compositions for stimulating production by acting on the underground formation: compositions for forming crevices or fractures
Y10S 507/902
Earth boring, well treating, and oil field chemistry: controlled release agent
Y10S 507/921
Earth boring, well treating, and oil field chemistry: specified breaker component for emulsion or gel

Family

Serial446,572Parent of this continuation-in-part · filed 4 Dec 1989
Serial446,573Parent of this continuation-in-part · filed 4 Dec 1989
Serial446,736Parent of this continuation-in-part · filed 6 Dec 1989
Serial446,831Parent of this continuation-in-part · filed 6 Dec 1989
Serial446,958Parent of this continuation-in-part · filed 6 Dec 1989
Serial637,391Parent of this continuation-in-part · filed 4 Jan 1991
Serial637,401Parent of this continuation-in-part · filed 4 Jan 1991
US 5,110,486 AThis patent

From the US filing history. Foreign family members aren’t listed.