Hydraulic Fracture Mapping From Treated Well. Channelized Reservoirs Development Optimization In Mexico

Berumen, Sergio; Gachuz, Heron; Rodriguez, Juan Manuel; Lapierre, Thierry Bovier; Kaiser, Pénéloppe

doi:10.1190/sbgf2007-221

Cited by 1 publication

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“…Over the years, a large number of hydraulic fracturing treatments have been monitored to determine fracture geometries (e.g., Warpinski et al . 1998; Rutledge and Phillips 2003; Berumen et al . 2004).…”

Section: Introductionmentioning

confidence: 99%

Importance of borehole deviation surveys for monitoring of hydraulic fracturing treatments

Bulant

Eisner

Pšenčı́k

et al. 2007

Geophysical Prospecting

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A B S T R A C TDuring seismic monitoring of hydraulic fracturing treatment, it is very common to ignore the deviations of the monitoring or treatment wells from their assumed positions. For example, a well is assumed to be perfectly vertical, but in fact, it deviates from verticality. This can lead to significant errors in the observed azimuth and other parameters of the monitored fracture-system geometry derived from microseismic event locations. For common hydraulic fracturing geometries, a 2 • deviation uncertainty on the positions of the monitoring or treatment well survey can cause a more than 20 • uncertainty of the inverted fracture azimuths. Furthermore, if the positions of both the injection point and the receiver array are not known accurately and the velocity model is adjusted to locate perforations on the assumed positions, several-millisecond discrepancies between measured and modeled SH-P traveltime differences may appear along the receiver array. These traveltime discrepancies may then be misinterpreted as an effect of anisotropy, and the use of such anisotropic model may lead to the mislocation of the detected fracture system. The uncertainty of the relative positions between the monitoring and treatment wells can have a cumulative, nonlinear effect on inverted fracture parameters. We show that incorporation of borehole deviation surveys allows reasonably accurate positioning of the microseismic events. In this study, we concentrate on the effects of horizontal uncertainties of receiver and perforation positions. Understanding them is sufficient for treatment of vertical wells, and also necessary for horizontal wells.

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Section: Introductionmentioning

confidence: 99%