Detection of fracturing events using derivatives of...

Details Detection of fracturing events using derivatives of... Detection of fracturing events using derivatives of...

G - Physics

01

N

G01N 3/00 (2006.01) E21B 43/26 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2050793

ABSTRACT OF THE DISCLOSURE In accordance with illustrative embodiments of the present invention, a method of determining fracture behavior from downhole pressure measurements that are made during a hydraulic well fracturing operation includes pumping fracturing fluids at a constant rate under high pressure against a formation to create fractures therein, and obtaining measurements representative of downhole pressures as pumping progresses, The logarithmic derivatives of such pressure measurements are used to determine the type of fracture behavior, as well as the onset of screenout where the fracturing fluid carries a proppant. In-situ stress or closure pressure also can be determined by finding a value thereof which makes a logarithmic net pressure plot have the same slope as the logarithmic plot of the values of the pressure derivatives.

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