Method of fracturing a subterranean formation

Details Method of fracturing a subterranean formation Method of fracturing a subterranean formation

E - Fixed Constructions

21

B

166/24

E21B 43/26 (2006.01) E21B 33/138 (2006.01) E21B 43/17 (2006.01)

Patent

CA 1071531

ABSTRACT OF THE DISCLOSURE A fracturing method wherein (a) a viscous, prop free fluid is injected into a new or preexisting fracture to widen and extend the fracture, (b) a viscous prop carrying fluid is injected in one or more stages, (c) a viscous prop free spacer is injected, (d) a low viscosity inefficient penetrating fluid is injected, all of the fore- going being injected at rates and pressures calculated to prevent said fracture from healing, (e) injection of fluids at rates and pressures calculated to prevent said fracture from healing is ceased (including the embodiments of injec- ting a low viscosity penetrating fluid at a matrix rate, ceasing injection entirely, flowing back the well, or a combination thereof), and thereafter at least steps (a) and (b) are repeated.

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