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...http://www.google.fr/patents/US5204183?utm_source=gb-gplus-shareBrevet US5204183 - Composition comprising polymer encapsulant for sealing layer encapsulated substrate
Composition comprising polymer encapsulant for sealing layer encapsulated ...
