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Published byTyler Cooper Modified over 9 years ago
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Simulation of Borehole Breakouts Using FRACOD
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Objective n To test the capability of the fracture propagation code FRACOD in predicting borehole breakouts. n To test the effectiveness of the fracture initiation function (no artificial fractures are introduced. All fractures shown in the examples are predicted automatically by the code)
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Main parameters n K IC =1.08 MPa m 1/2 ; K IIC =(1.0-1.5) K IC n Tensile strength = 7MPa Compressive strength c =28MPa Compressive strength c =28MPa Failure criterion ( 1 ) 2 = 200*( 3 +3.95); Failure criterion ( 1 ) 2 = 200*( 3 +3.95); E=55GPa, =0.25 E=55GPa, =0.25 Insitu stresses: H =36MPa, h =45MPa, fluid pressure p =18MPa Insitu stresses: H =36MPa, h =45MPa, fluid pressure p =18MPa n Fracture contact properties: JKs=JKn=10e4GPa/m; friction angle=0,10 degrees, cohesion=0 n Borehole Diameter =0.216m
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Case 1 Fracture surface friction angle=0 K IIC =K IC
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Principal Stresses
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Displacements
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Case 2 Fracture surface friction angle=10° K IIC =K IC
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Increase stresses by 5%
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Case 3 Fracture surface friction angle=0° K IIC =1.5K IC
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Case 4 Fracture surface friction angle=10° K IIC =1.5K IC
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Increase stresses by 10%
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THANK YOU!
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