Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2006-09-05
2006-09-05
Dang, Hoang (Department: 3672)
Wells
Processes
With indicating, testing, measuring or locating
C166S308100, C367S032000, C702S006000
Reexamination Certificate
active
07100688
ABSTRACT:
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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Stephenson Stanley V.
Surjaatmadja Jim B.
Dang Hoang
Dougherty, Jr. C. Clark
Halliburton Energy Service,s Inc.
Kent Robert A.
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