create a mini fracture fig1 2 shows the top view of the sharp surface 1010 in this case application of the mechanical device leads to a relatively short fracture in the formation even before the hydraulic fracturing operation has started the relatively short fracture will act as the initiation point for the final hydraulic fracture fig9 is a flowchart showing aspects of a hydraulic fracturing process that includes mechanical expander devices used to induce stress and or initiate fractures according to some other embodiments in block 910 a side hole is drilled perpendicular to or at a predetermined angle relative to the direction of the main well bore to a depth which is comparable to the diameter of the main well such as the case shown in fig1 the side hole s are made deep enough that the stress variation caused by the well drilling operation is by passed or at least reduced according to some embodiments a small drill bit smaller than the drill bit used to drill the well is used along with a drill motor to drill the side hole commercial logging tools are available to perform this operation such as the cased hole dynamics tester chdt tool offered by schlumberger u2122 according to some embodiments the side holes are drilled using a side well coring.