深层地应力地理方位确定的新方法

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Abstract Geographic orientation of geostress is an important basic parameter for reasonable well layout，hydraulic fracturing design，optimization of directional orientation of complex structural well and determination of safe drilling fluid density window. According to the problems that laboratory geostress testing methods can not determine the geographic orientation of horizontal geostress for nondirectional cores，the geographic orientation of cores is calibrated by using viscous remanent magnetization component；the acoustic emission Kaiser test under confining pressures for calibrated cores is carried out so as to determine the magnitude and relative orientation of horizontal geostress. Eventually，the geographic orientations of the maximum and minor principal geostresses are determined. This method solves the problem that the geographic orientation of geostresses can not be determined by using Kaiser test and improves the testing methods of geostress in deep formation. Meanwhile，it provides basic data for drilling engineering and optimization of oilfield stimulation.

Key words： petroleum engineering geostress measurement Kaiser effect viscous remanent magnetization geographic orientation

Received: 12 August 2010

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http://www.rockmech.org/EN/Y2011/V30/I2/233

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