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

E - Fixed Constructions

21

B

E21B 43/27 (2006.01) C09K 8/92 (2006.01)

Patent

CA 2098620

2098620 9212328 PCTABS00014 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.

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