Encapsulated breaker chemical with a multi-coat layer urea

Details Encapsulated breaker chemical with a multi-coat layer urea Encapsulated breaker chemical with a multi-coat layer urea

1991-01-04

1992-04-07

Stoll, Robert L.

Compositions

Leather or fur treating

252 8553, 25218632, 252330, 252358, 42840222, 166308, 427213, E21B 4326

Patent

active

051025590

ABSTRACT:
An encapsulated breaker chemical composition used in a fracturing process in an oil or gas stimulation operation which comprises: (a) a breaker chemical; (b) a water soluble sealing layer, such as urea, having a thickness within the range of about 1 to about 30 microns deposited on the surface of said breaker chemical and encapsulating said breaker chemical; and (c) a pinhole free coating of a neutralized sulfonated elastomeric polymer of about 2 to about 80 microns thick deposited onto the surface of the coated breaker chemical, wherein said neutralized sulfonated polymer encapsulates the breaker chemical and is permeable to the breaker chemical.

REFERENCES:
patent: 3990978 (1976-11-01), Hill
patent: 4701204 (1987-10-01), Duvdevani et al.
patent: 4741401 (1988-05-01), Walles et al.
patent: 4741956 (1988-05-01), Thaler et al.
patent: 4770796 (1988-09-01), Jacobs
patent: 4788081 (1988-11-01), Thaler et al.
patent: 4919209 (1990-04-01), King

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