Research Article
An Analytical Model for Fracture Initiation from a Particular Radial Borehole in Hydraulic Fracturing Guided by Multiradial Boreholes
Table 1
Basic calculation parameters.
| | Parameter | Value | Unit |
| | Maximum horizontal in situ stress, | 48 | MPa | | Minimum horizontal in situ stress, | 40 | MPa | | Vertical in situ stress, | 50 | MPa | | Poisson’s ratio of rock, | 0.2 | — | | Young’s modulus of rock, | 50 | GPa | | Young’s modulus of the casing, | 135 | GPa | | Exterior radius of the main wellbore, | 0.18 | m | | Interior radius of the main wellbore, | 0.165 | m | | Radius of radial borehole 0, | 0.015 | m | | Radius of radial borehole 1, | 0.015 | m | | Internal pressure, | 45 | MPa | | Initial pore fluid pressure, | 20 | MPa | | Permeability coefficient, | 0.9 | — | | Formation porosity, | 0.15 | — | | Biot coefficient, | 0.55 | — | | Azimuth angles of radial borehole 0, | 45 | Degree | | Intersection angle of radial boreholes, | 0 | Degree | | Depth difference between radial boreholes, | 0.05 | m | | Tensile strength of rock, | 8 | MPa |
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