Orthotropic shale brittleness index prediction method
An orthotropic and brittle index technology, applied in the field of drilling and completion engineering, can solve the problems of distortion of shale brittleness index evaluation results, inability to evaluate shale formation brittle anisotropy, errors, etc.
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[0104] Taking the Longmaxi shale at 3171 meters in Well X1 as an example, the elastic parameter in the shale formation coordinate system: E 1 =46.07GPa,E 2 =43.43GPa,E 3 =36.59GPa, ν 12 =0.262, ν 13 =0.268, ν 21 =0.247, ν 23 =0.253, ν 31 =0.213, ν 32 = 0.213.
[0105] Now, the anisotropic brittleness index BI 3_1 , the anisotropic brittleness index BI along the y-axis 3_2 , the anisotropic brittleness index BI along the z-axis 3_3 Numerical simulation study of the influence of , the results are as follows:
[0106] (1) image 3 is the anisotropic brittleness index BI along the x-axis under different azimuths α and inclination β 3_1 The 3D graph and its corresponding section graph after polar coordinate conversion to Cartesian coordinates.
[0107] The positive and negative signs in the figure do not mean that the brittleness index is negative, but are related to the azimuth angle α and the inclination angle β. The spatial form of the figure is an irregular ellips...
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