Measuring and testing – Borehole or drilling – Downhole test
Patent
1985-07-01
1987-04-28
Novosad, Stephen J.
Measuring and testing
Borehole or drilling
Downhole test
73784, 166250, E21B 4700, G01L 100
Patent
active
046604154
ABSTRACT:
A method is provided for determining at least one characteristic magnitude of a geological formation from a so-called characteristic set formed of three magnitudes designated respectively by K.sub.1C, .sigma..sub.3 and H.sub.F which are the stress intensity factor of the formation, the minimum in situ principle stress and the fracture height knowing at least one of these magnitudes. In this method, the geological formation is subjected to a fracturing operation during which the minimum pressure reached during the fracturing and the volume V.sub.m of the fracture at the time when the pressure is minimum are determined. Then the desired characteristic is determined from mathematical relationships.
REFERENCES:
patent: 4372380 (1983-02-01), Smith et al.
patent: 4389896 (1983-06-01), Babcock
patent: 4398416 (1983-08-01), Nolte
patent: 4434848 (1984-03-01), Smith
patent: 4515214 (1985-05-01), Fitch et al.
Abou-Sayed, A. S., "An Experimental Tech. for Measuring the Fracture Toughness of Rocks Under Downhole Stress Condition" 6th Intern. Conference of Experimental Stress Analysis, Munich, Germany, Sep. 1978.
Institut Francais du Pe'trole
Kisliuk Bruce M.
Novosad Stephen J.
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