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Finite element modeling of rock mass cutting by cutters for PDC drill bits

UDK: 622.24.001.57
DOI: 10.24887/0028-2448-2017-1-38-41
Key words: finite element method, PDC bits, cutters, cutting, numerical experiment
Authors: T.A. Pryhorovska (Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine, Ivano-Frankivsk), S.S. Chaplinskiy (Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine, Ivano-Frankivsk)

Recent years the finite element method is used for simulation of cutting processes, including cutting of rocks due to its simplicity and efficiency. Modern software (Ansys Explicit) allows to implement this method for optimizing the design of the drilling tool, including PDC drill bits. This approach is particularly relevant in connection with large costs of drill bits, their elements, and experiments in general. The task of this work was the finite element simulation of different shapes of PDC drill bit cutters with linear and round cutting to determine the shape of the cutter, which causes the minimal fluctuation of cutting force. Because of absence of relevant experimental data for simulation verification, qualitative simulation data are of interest. The feature of this approach is the dynamic formulation of the problem. To solve this problem there were given: spatial forms of cutters; elements of cutting conditions: cutting speed, depth of cut; rheological model of the processed material; friction model.

Based on the presented model it was considered the PDC drill bits cuttings design influence on rock cutting indexes for linear and round cutting process. This approach is available for PDC drill bit cutters simulation for rock mass cutting due to its efficiency and possibility to use for designing a drilling tool. It made possible to obtain qualitative characteristics of the process for the all period of cutter operation, and also obtain the distribution of rock mass stresses and rock reaction forces fluctuation for computational experiment period.

References

1. Pei Ju, Zhenquan Wang, Yinghu Zhai et al., Numerical simulation study on the optimization design of the crown shape of PDC drill bit, J. Petrol. Explor. Prod. Technol., DOI 10.1007/s13202-013-0091-9

2. Jaime M., Numerical modeling of rock cutting and its associated fragmentation process using the finite element method: PhD thesis, Pittsburg, University of Pittsburgh, 2012, 275 p.

3. Hallquist J.O., LS-DYNA Theoretical manual, Livermore: LSTC, 1998, 498 r.

4. Zaloga V.A., Krivoruchko D.V., Khvostik S.N., The simulation model of the rectangular free cutting (In Russ.), Vіsnik Sums'kogo derzhavnogo unіversitetu. Serіya: Tekhnіchnі nauki, 2005, no. 11, pp. 55-66.

Recent years the finite element method is used for simulation of cutting processes, including cutting of rocks due to its simplicity and efficiency. Modern software (Ansys Explicit) allows to implement this method for optimizing the design of the drilling tool, including PDC drill bits. This approach is particularly relevant in connection with large costs of drill bits, their elements, and experiments in general. The task of this work was the finite element simulation of different shapes of PDC drill bit cutters with linear and round cutting to determine the shape of the cutter, which causes the minimal fluctuation of cutting force. Because of absence of relevant experimental data for simulation verification, qualitative simulation data are of interest. The feature of this approach is the dynamic formulation of the problem. To solve this problem there were given: spatial forms of cutters; elements of cutting conditions: cutting speed, depth of cut; rheological model of the processed material; friction model.

Based on the presented model it was considered the PDC drill bits cuttings design influence on rock cutting indexes for linear and round cutting process. This approach is available for PDC drill bit cutters simulation for rock mass cutting due to its efficiency and possibility to use for designing a drilling tool. It made possible to obtain qualitative characteristics of the process for the all period of cutter operation, and also obtain the distribution of rock mass stresses and rock reaction forces fluctuation for computational experiment period.

References

1. Pei Ju, Zhenquan Wang, Yinghu Zhai et al., Numerical simulation study on the optimization design of the crown shape of PDC drill bit, J. Petrol. Explor. Prod. Technol., DOI 10.1007/s13202-013-0091-9

2. Jaime M., Numerical modeling of rock cutting and its associated fragmentation process using the finite element method: PhD thesis, Pittsburg, University of Pittsburgh, 2012, 275 p.

3. Hallquist J.O., LS-DYNA Theoretical manual, Livermore: LSTC, 1998, 498 r.

4. Zaloga V.A., Krivoruchko D.V., Khvostik S.N., The simulation model of the rectangular free cutting (In Russ.), Vіsnik Sums'kogo derzhavnogo unіversitetu. Serіya: Tekhnіchnі nauki, 2005, no. 11, pp. 55-66.



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