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Numerical modeling of tool-rock interaction in laminated formations
Based on a review of the literature, a numerical model of the chip formation
process in laminated rock formations has been developed. The model uses a finite
element approach to simulate the anisotropic behavior of laminated rock formations.
. The finite element program has been developed with the assumption of
two-dimensional plane strain. Anisotropic elements and dynamic loading are used to
represent the actual penetration process of a bit tooth. An iteration method, using an
incremental approach, has been applied for the continuous tooth penetration process.
Displacements and axial loads have been modified after each iteration.
The program provides quantitative information on stresses and displacements
during the penetration process. Furthermore, bit deviations in laminated formations
can be inferred.. Different rock strength characteristics have been employed on each
side of the bit Bit tooth-rock interaction for various formation dips (from ()O to 9(0)
of the Berea sandstone have been simulated and compared with experimental results.