1. Simulation of Borehole Breakouts Using FRACOD

2. 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)

3. 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

4. Case 1 Fracture surface friction angle=0 K IIC =K IC

16. Principal Stresses

28. Displacements

40. Case 2 Fracture surface friction angle=10° K IIC =K IC

42. Increase stresses by 5%

45. Case 3 Fracture surface friction angle=0° K IIC =1.5K IC

56. Case 4 Fracture surface friction angle=10° K IIC =1.5K IC

59. Increase stresses by 10%

64. THANK YOU!