Method of fracturing subterranean formations using...

Details Method of fracturing subterranean formations using... Method of fracturing subterranean formations using...

E - Fixed Constructions

21

B

166/21

E21B 43/26 (2006.01) C09K 8/64 (2006.01) E21B 43/27 (2006.01)

Patent

CA 1041416

ABSTRACT A hydraulic fracturing method wherein a viscous oil-in-water emulsion is injected into a formation under sufficient pressure to fracture the forma- tion. The emulsion contains from about 70 to about 90 volume percent of an internal liquid hydrocarbon phase, from about 10 to about 30 volume percent of an external aqueous phase and sufficient amounts of a nonionic surfactant to stabilize and viscosify the emulsion. The preferred hydrocarbon phase concentration is between about 75 and 85 volume percent. The nonionic surfac- tant also gives the emulsion a breaking temperature which is not greater than the temperature of the formation. Preferably, an electrolyte is used to adjust the temperature at which the emulsion will break. After fracturing is completed the emulsion is then left in the wellbore for a sufficient time to permit the temperature of the emulsion to reach its breaking temperature. Upon breaking, the emulsion reverts to a low viscosity fluid which is readily remova- ble from the formation. -1-

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