Pressure data during and after hydraulic fracturing is routinely collected, yet typically it is not fully analysed. Fluctuations in treatment pressure may provide insights into the physical mechanisms at play during hydro-mechanically coupled movement of fluid in the subsurface. A time-frequency representation of surface pressure data from cases within the Western Canadian sedimentary basin reveals characteristic time-frequency patterns that may be causally linked with microseismicity and pressure transient observations. Integration of these distinct observations leads to various working models for observed time varying frequencies. Resonances within the fluid connected fracture network may develop and give an indication of the fluid connected length and mechanical aperture within the rock mass. Episodic slip or opening of the fracture mesh may create a valve-like behaviour, resulting in pressure spikes and low-frequency signals. Sources of noise and the limitations associated with typical treating pressure data are discussed and recommendations are presented to gain more value from this novel analysis technique.
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2nd International Discrete Fracture Network Engineering Conference
June 20–22, 2018
Seattle, Washington, USA
Time-Frequency Analysis of Treatment Pressure from Hydraulic Fracturing
Christopher Clarkson
Christopher Clarkson
University of Calgary
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Paper presented at the 2nd International Discrete Fracture Network Engineering Conference, Seattle, Washington, USA, June 2018.
Paper Number:
ARMA-DFNE-18-1377
Published:
June 20 2018
Citation
MacKay, Mason, Zanganeh, Behnam, Eaton, David, and Christopher Clarkson. "Time-Frequency Analysis of Treatment Pressure from Hydraulic Fracturing." Paper presented at the 2nd International Discrete Fracture Network Engineering Conference, Seattle, Washington, USA, June 2018.
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