Determination of fracture closure pressure

Details Determination of fracture closure pressure Determination of fracture closure pressure

E - Fixed Constructions

21

B

166/2

E21B 49/00 (2006.01) E21B 43/26 (2006.01) E21B 47/06 (2006.01)

Patent

CA 1185170

ABSTRACT A method of determining the minimum in-situ stress of an underground formation penetrated by a well. The method includes injecting a fluid at a certain rate into the formation to produce fractures in the formation, backflowing the injected fluid from the well at a rate less than the injection rate, and measuring the well fluid pressure decrease during the backflow to establish the pressure at which the fractures close.

396411

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