Fracture monitoring using pressure-frequency analysis

Details Fracture monitoring using pressure-frequency analysis Fracture monitoring using pressure-frequency analysis

G - Physics

01

V

G01V 9/00 (2006.01) E21B 43/26 (2006.01) G01V 1/50 (2006.01)

Patent

CA 2440247

Changes occurring downhole during a fracturing process can create or reflect pressure signals. Capturing and evaluating such pressure waves during fracturing enables personnel to monitor, in real time or later, what happens downhole. When a fracture extends, a burst of acoustic noise is embodied in a pressure wave or signal, as is noise coming from other sources. By transforming time-based pressure signals to a frequency base, one can monitor this acoustic noise. In a particular implementation, a waterfall plot of frequency spectra at successive time slices of the original signal is used to determine frequency ridges, such as a ridge of decreasing frequencies indicates fracture extension and a ridge of increasing frequencies indicates either closure or proppant backing up in the fracture. Filtering, such as wavelet filtering, can be used. A fracturing process can be controlled in response to determining whether the fracture is extending.

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