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Patent
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G01V 1/40 (2006.01) E21B 43/26 (2006.01) E21B 49/00 (2006.01) G01V 1/133 (2006.01) G01V 1/46 (2006.01)
Patent
CA 1267967
ABSTRACT Disclosed is a method of determining the geometry of a hydraulic fracture in the earth communicating with the surface of the earth through a well bore or the like comprising the steps of a) perturbing fluid in the well bore to induce oscillation in a fluid in said well bore, b) measuring the resulting pressure oscil- lations at at least one point in the well bore, and c) calculating the theoretical shape of the fracture in the earth based on the oscillations detected in the well bore. Also disclosed is a method of determining the orientation of a hydraulic fracture plane in the earth comprising positioning an array of sensors for measuring seismic ground motion above a region which includes the fracture, providing a well bore having fluid therein communicating with the fracture to be defined, perturbing the fluid to cause transient pressure or flow oscillations in the fluid column in the well bore, measuring seismic ground motion induced by the transient pressure and flow oscillations in the fracture, calculating, using theory of wave propagation, the ground motion expected of fractures of different orientations, comparing the measured ground motion with the calculated ground motion patterns representing fractures of different orientations, and selecting the fracture orientation that yields calculated seismic ground motions most closely resembling the measured seismic ground motions as the most probable fracture orientation, calculating a probable fracture orientation based on the seismic motion of the ground.
532436
Holzhausen Gary Reed
St. Lawrence William
Applied Geomechanics Inc.
Smart & Biggar
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